patch: alpha

[st.git] / st.c

diff --git a/st.c b/st.c
index 6dc20fb..c71fa06 100644 (file)
--- a/st.c
+++ b/st.c
@@ -1,39 +1,24 @@
-/* See LICENSE for licence details. */
-#define _XOPEN_SOURCE 600
+/* See LICENSE for license details. */

 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>

-#include <locale.h>

 #include <pwd.h>
 #include <stdarg.h>
 #include <pwd.h>
 #include <stdarg.h>

-#include <stdbool.h>

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <signal.h>
 #include <sys/ioctl.h>
 #include <sys/select.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <signal.h>
 #include <sys/ioctl.h>
 #include <sys/select.h>

-#include <sys/stat.h>
-#include <sys/time.h>

 #include <sys/types.h>
 #include <sys/wait.h>
 #include <sys/types.h>
 #include <sys/wait.h>

-#include <time.h>
+#include <termios.h>

 #include <unistd.h>
 #include <unistd.h>

-#include <X11/Xatom.h>
-#include <X11/Xlib.h>
-#include <X11/Xutil.h>
-#include <X11/cursorfont.h>
-#include <X11/keysym.h>
-#include <X11/extensions/Xdbe.h>
-#include <X11/Xft/Xft.h>
-#include <fontconfig/fontconfig.h>
-
-#define Glyph Glyph_
-#define Font Font_
-#define Draw XftDraw *
-#define Colour XftColor
-#define Colourmap Colormap
+#include <wchar.h>
+
+#include "st.h"
+#include "win.h"

 
 #if   defined(__linux)
  #include <pty.h>
 
 #if   defined(__linux)
  #include <pty.h>


@@ -43,49 +28,29 @@
  #include <libutil.h>
 #endif
 
  #include <libutil.h>
 #endif
 

-#define USAGE \
-       "st " VERSION " (c) 2010-2012 st engineers\n" \
-       "usage: st [-v] [-c class] [-f font] [-g geometry] [-o file]" \
-       " [-t title] [-w windowid] [-e command ...]\n"
-
-/* XEMBED messages */
-#define XEMBED_FOCUS_IN  4
-#define XEMBED_FOCUS_OUT 5
-

 /* Arbitrary sizes */
 /* Arbitrary sizes */

-#define ESC_BUF_SIZ   256
-#define ESC_ARG_SIZ   16
-#define STR_BUF_SIZ   256
-#define STR_ARG_SIZ   16
-#define DRAW_BUF_SIZ  20*1024
+#define UTF_INVALID   0xFFFD

 #define UTF_SIZ       4
 #define UTF_SIZ       4

-#define XK_ANY_MOD    UINT_MAX
-#define XK_NO_MOD     0
-
-#define REDRAW_TIMEOUT (80*1000) /* 80 ms */
+#define ESC_BUF_SIZ   (128*UTF_SIZ)
+#define ESC_ARG_SIZ   16
+#define STR_BUF_SIZ   ESC_BUF_SIZ
+#define STR_ARG_SIZ   ESC_ARG_SIZ

 
 /* macros */
 
 /* macros */

-#define SERRNO strerror(errno)
-#define MIN(a, b)  ((a) < (b) ? (a) : (b))
-#define MAX(a, b)  ((a) < (b) ? (b) : (a))
-#define LEN(a)     (sizeof(a) / sizeof(a[0]))
-#define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
-#define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
-#define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
-#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
-#define IS_SET(flag) (term.mode & (flag))
-#define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
-
-#define VT102ID "\033[?6c"
-
-enum glyph_attribute {
-       ATTR_NULL      = 0,
-       ATTR_REVERSE   = 1,
-       ATTR_UNDERLINE = 2,
-       ATTR_BOLD      = 4,
-       ATTR_GFX       = 8,
-       ATTR_ITALIC    = 16,
-       ATTR_BLINK     = 32,
+#define IS_SET(flag)           ((term.mode & (flag)) != 0)
+#define ISCONTROLC0(c)         (BETWEEN(c, 0, 0x1f) || (c) == 0x7f)
+#define ISCONTROLC1(c)         (BETWEEN(c, 0x80, 0x9f))
+#define ISCONTROL(c)           (ISCONTROLC0(c) || ISCONTROLC1(c))
+#define ISDELIM(u)             (u && wcschr(worddelimiters, u))
+
+enum term_mode {
+       MODE_WRAP        = 1 << 0,
+       MODE_INSERT      = 1 << 1,
+       MODE_ALTSCREEN   = 1 << 2,
+       MODE_CRLF        = 1 << 3,
+       MODE_ECHO        = 1 << 4,
+       MODE_PRINT       = 1 << 5,
+       MODE_UTF8        = 1 << 6,

 };
 
 enum cursor_movement {
 };
 
 enum cursor_movement {


@@ -96,820 +61,649 @@ enum cursor_movement {
 enum cursor_state {
        CURSOR_DEFAULT  = 0,
        CURSOR_WRAPNEXT = 1,
 enum cursor_state {
        CURSOR_DEFAULT  = 0,
        CURSOR_WRAPNEXT = 1,

-       CURSOR_ORIGIN   = 2
+       CURSOR_ORIGIN   = 2

 };
 
 };
 

-enum glyph_state {
-       GLYPH_SET   = 1,
-       GLYPH_DIRTY = 2
-};
-
-enum term_mode {
-       MODE_WRAP        = 1,
-       MODE_INSERT      = 2,
-       MODE_APPKEYPAD   = 4,
-       MODE_ALTSCREEN   = 8,
-       MODE_CRLF        = 16,
-       MODE_MOUSEBTN    = 32,
-       MODE_MOUSEMOTION = 64,
-       MODE_MOUSE       = 32|64,
-       MODE_REVERSE     = 128,
-       MODE_KBDLOCK     = 256,
-       MODE_HIDE        = 512,
-       MODE_ECHO        = 1024,
-       MODE_APPCURSOR   = 2048
+enum charset {
+       CS_GRAPHIC0,
+       CS_GRAPHIC1,
+       CS_UK,
+       CS_USA,
+       CS_MULTI,
+       CS_GER,
+       CS_FIN

 };
 
 enum escape_state {
        ESC_START      = 1,
 };
 
 enum escape_state {
        ESC_START      = 1,

-       ESC_CSI = 2,
-       ESC_STR = 4, /* DSC, OSC, PM, APC */
+       ESC_CSI        = 2,
+       ESC_STR        = 4,  /* DCS, OSC, PM, APC */

        ESC_ALTCHARSET = 8,
        ESC_STR_END    = 16, /* a final string was encountered */
        ESC_TEST       = 32, /* Enter in test mode */
        ESC_ALTCHARSET = 8,
        ESC_STR_END    = 16, /* a final string was encountered */
        ESC_TEST       = 32, /* Enter in test mode */

+       ESC_UTF8       = 64,

 };
 
 };
 

-enum window_state {
-       WIN_VISIBLE = 1,
-       WIN_REDRAW  = 2,
-       WIN_FOCUSED = 4
-};
-
-/* bit macro */
-#undef B0
-enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
-
-typedef unsigned char uchar;
-typedef unsigned int uint;
-typedef unsigned long ulong;
-typedef unsigned short ushort;
-
-typedef struct {
-       char c[UTF_SIZ];     /* character code */
-       uchar mode;  /* attribute flags */
-       ushort fg;   /* foreground  */
-       ushort bg;   /* background  */
-       uchar state; /* state flags    */
-} Glyph;
-
-typedef Glyph* Line;
-

 typedef struct {
 typedef struct {

-       Glyph attr;      /* current char attributes */
+       Glyph attr; /* current char attributes */

        int x;
        int y;
        char state;
 } TCursor;
 
        int x;
        int y;
        char state;
 } TCursor;
 

+typedef struct {
+       int mode;
+       int type;
+       int snap;
+       /*
+        * Selection variables:
+        * nb – normalized coordinates of the beginning of the selection
+        * ne – normalized coordinates of the end of the selection
+        * ob – original coordinates of the beginning of the selection
+        * oe – original coordinates of the end of the selection
+        */
+       struct {
+               int x, y;
+       } nb, ne, ob, oe;
+
+       int alt;
+} Selection;
+
+/* Internal representation of the screen */
+typedef struct {
+       int row;      /* nb row */
+       int col;      /* nb col */
+       Line *line;   /* screen */
+       Line *alt;    /* alternate screen */
+       int *dirty;   /* dirtyness of lines */
+       TCursor c;    /* cursor */
+       int ocx;      /* old cursor col */
+       int ocy;      /* old cursor row */
+       int top;      /* top    scroll limit */
+       int bot;      /* bottom scroll limit */
+       int mode;     /* terminal mode flags */
+       int esc;      /* escape state flags */
+       char trantbl[4]; /* charset table translation */
+       int charset;  /* current charset */
+       int icharset; /* selected charset for sequence */
+       int *tabs;
+       Rune lastc;   /* last printed char outside of sequence, 0 if control */
+} Term;
+

 /* CSI Escape sequence structs */
 /* CSI Escape sequence structs */

-/* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
+/* ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */

 typedef struct {
        char buf[ESC_BUF_SIZ]; /* raw string */
 typedef struct {
        char buf[ESC_BUF_SIZ]; /* raw string */

-       int len;               /* raw string length */
+       size_t len;            /* raw string length */

        char priv;
        int arg[ESC_ARG_SIZ];
        char priv;
        int arg[ESC_ARG_SIZ];

-       int narg;             /* nb of args */
-       char mode;
+       int narg;              /* nb of args */
+       char mode[2];

 } CSIEscape;
 
 /* STR Escape sequence structs */
 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 typedef struct {
 } CSIEscape;
 
 /* STR Escape sequence structs */
 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 typedef struct {

-       char type;           /* ESC type ... */
-       char buf[STR_BUF_SIZ]; /* raw string */
-       int len;               /* raw string length */
+       char type;             /* ESC type ... */
+       char *buf;             /* allocated raw string */
+       size_t siz;            /* allocation size */
+       size_t len;            /* raw string length */

        char *args[STR_ARG_SIZ];
        char *args[STR_ARG_SIZ];

-       int narg;             /* nb of args */
+       int narg;              /* nb of args */

 } STREscape;
 
 } STREscape;
 

-/* Internal representation of the screen */
-typedef struct {
-       int row;        /* nb row */
-       int col;        /* nb col */
-       Line *line;     /* screen */
-       Line *alt;      /* alternate screen */
-       bool *dirty;    /* dirtyness of lines */
-       TCursor c;      /* cursor */
-       int top;        /* top    scroll limit */
-       int bot;        /* bottom scroll limit */
-       int mode;       /* terminal mode flags */
-       int esc;        /* escape state flags */
-       bool *tabs;
-} Term;
-
-/* Purely graphic info */
-typedef struct {
-       Display *dpy;
-       Colourmap cmap;
-       Window win;
-       XdbeBackBuffer buf;
-       Atom xembed, wmdeletewin;
-       XIM xim;
-       XIC xic;
-       Draw draw;
-       Visual *vis;
-       int scr;
-       bool isfixed; /* is fixed geometry? */
-       int fx, fy, fw, fh; /* fixed geometry */
-       int tw, th; /* tty width and height */
-       int w;  /* window width */
-       int h;  /* window height */
-       int ch; /* char height */
-       int cw; /* char width  */
-       char state; /* focus, redraw, visible */
-} XWindow;
-
-typedef struct {
-       KeySym k;
-       uint mask;
-       char s[ESC_BUF_SIZ];
-       /* three valued logic variables: 0 indifferent, 1 on, -1 off */
-       signed char appkey;             /* application keypad */
-       signed char appcursor;          /* application cursor */
-       signed char crlf;               /* crlf mode          */
-} Key;
-
-/* TODO: use better name for vars... */
-typedef struct {
-       int mode;
-       int bx, by;
-       int ex, ey;
-       struct {
-               int x, y;
-       } b, e;
-       char *clip;
-       Atom xtarget;
-       bool alt;
-       struct timeval tclick1;
-       struct timeval tclick2;
-} Selection;
-
-typedef union {
-       int i;
-       unsigned int ui;
-       float f;
-       const void *v;
-} Arg;
-
-typedef struct {
-       unsigned int mod;
-       KeySym keysym;
-       void (*func)(const Arg *);
-       const Arg arg;
-} Shortcut;
-
-/* function definitions used in config.h */
-static void xzoom(const Arg *);
-static void selpaste(const Arg *);
-
-/* Config.h for applying patches and the configuration. */
-#include "config.h"
-
-/* Font structure */
-typedef struct {
-       int height;
-       int width;
-       int ascent;
-       int descent;
-       short lbearing;
-       short rbearing;
-       XftFont *set;
-} Font;
-
-/* Drawing Context */
-typedef struct {
-       Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
-       Font font, bfont, ifont, ibfont;
-} DC;
-
-static void die(const char *, ...);
-static void draw(void);
-static void redraw(void);
-static void drawregion(int, int, int, int);
-static void execsh(void);
+static void execsh(char *, char **);
+static void stty(char **);

 static void sigchld(int);
 static void sigchld(int);

-static void run(void);
+static void ttywriteraw(const char *, size_t);

 
 static void csidump(void);
 static void csihandle(void);
 static void csiparse(void);
 static void csireset(void);
 
 static void csidump(void);
 static void csihandle(void);
 static void csiparse(void);
 static void csireset(void);

+static int eschandle(uchar);

 static void strdump(void);
 static void strhandle(void);
 static void strparse(void);
 static void strreset(void);
 
 static void strdump(void);
 static void strhandle(void);
 static void strparse(void);
 static void strreset(void);
 

+static void tprinter(char *, size_t);
+static void tdumpsel(void);
+static void tdumpline(int);
+static void tdump(void);

 static void tclearregion(int, int, int, int);
 static void tcursor(int);
 static void tdeletechar(int);
 static void tdeleteline(int);
 static void tinsertblank(int);
 static void tinsertblankline(int);
 static void tclearregion(int, int, int, int);
 static void tcursor(int);
 static void tdeletechar(int);
 static void tdeleteline(int);
 static void tinsertblank(int);
 static void tinsertblankline(int);

+static int tlinelen(int);

 static void tmoveto(int, int);
 static void tmoveto(int, int);

-static void tmoveato(int x, int y);
-static void tnew(int, int);
+static void tmoveato(int, int);

 static void tnewline(int);
 static void tnewline(int);

-static void tputtab(bool);
-static void tputc(char *, int);
+static void tputtab(int);
+static void tputc(Rune);

 static void treset(void);
 static void treset(void);

-static int tresize(int, int);

 static void tscrollup(int, int);
 static void tscrolldown(int, int);
 static void tscrollup(int, int);
 static void tscrolldown(int, int);

-static void tsetattr(int*, int);
-static void tsetchar(char *, Glyph *, int, int);
+static void tsetattr(const int *, int);
+static void tsetchar(Rune, const Glyph *, int, int);
+static void tsetdirt(int, int);

 static void tsetscroll(int, int);
 static void tswapscreen(void);
 static void tsetscroll(int, int);
 static void tswapscreen(void);

-static void tsetdirt(int, int);
-static void tsetmode(bool, bool, int *, int);
+static void tsetmode(int, int, const int *, int);
+static int twrite(const char *, int, int);

 static void tfulldirt(void);
 static void tfulldirt(void);

-static void techo(char *, int);
-
-static inline bool match(uint, uint);
-static void ttynew(void);
-static void ttyread(void);
-static void ttyresize(void);
-static void ttywrite(const char *, size_t);
-
-static void xdraws(char *, Glyph, int, int, int, int);
-static void xhints(void);
-static void xclear(int, int, int, int);
-static void xdrawcursor(void);
-static void xinit(void);
-static void xloadcols(void);
-static void xresettitle(void);
-static void xseturgency(int);
-static void xsetsel(char*);
-static void xtermclear(int, int, int, int);
-static void xresize(int, int);
-
-static void expose(XEvent *);
-static void visibility(XEvent *);
-static void unmap(XEvent *);
-static char *kmap(KeySym, uint);
-static void kpress(XEvent *);
-static void cmessage(XEvent *);
-static void cresize(int width, int height);
-static void resize(XEvent *);
-static void focus(XEvent *);
-static void brelease(XEvent *);
-static void bpress(XEvent *);
-static void bmotion(XEvent *);
-static void selnotify(XEvent *);
-static void selclear(XEvent *);
-static void selrequest(XEvent *);
-
-static void selinit(void);
-static inline bool selected(int, int);
-static void selcopy(void);
+static void tcontrolcode(uchar );
+static void tdectest(char );
+static void tdefutf8(char);
+static int32_t tdefcolor(const int *, int *, int);
+static void tdeftran(char);
+static void tstrsequence(uchar);
+
+static void drawregion(int, int, int, int);
+
+static void selnormalize(void);

 static void selscroll(int, int);
 static void selscroll(int, int);

+static void selsnap(int *, int *, int);

 
 

-static int utf8decode(char *, long *);
-static int utf8encode(long *, char *);
-static int utf8size(char *);
-static int isfullutf8(char *, int);
-
-static ssize_t xwrite(int, char *, size_t);
-static void *xmalloc(size_t);
-static void *xrealloc(void *, size_t);
-static void *xcalloc(size_t nmemb, size_t size);
-
-static void (*handler[LASTEvent])(XEvent *) = {
-       [KeyPress] = kpress,
-       [ClientMessage] = cmessage,
-       [ConfigureNotify] = resize,
-       [VisibilityNotify] = visibility,
-       [UnmapNotify] = unmap,
-       [Expose] = expose,
-       [FocusIn] = focus,
-       [FocusOut] = focus,
-       [MotionNotify] = bmotion,
-       [ButtonPress] = bpress,
-       [ButtonRelease] = brelease,
-       [SelectionClear] = selclear,
-       [SelectionNotify] = selnotify,
-       [SelectionRequest] = selrequest,
-};
+static size_t utf8decode(const char *, Rune *, size_t);
+static Rune utf8decodebyte(char, size_t *);
+static char utf8encodebyte(Rune, size_t);
+static size_t utf8validate(Rune *, size_t);
+
+static char *base64dec(const char *);
+static char base64dec_getc(const char **);
+
+static ssize_t xwrite(int, const char *, size_t);

 
 /* Globals */
 
 /* Globals */

-static DC dc;
-static XWindow xw;

 static Term term;
 static Term term;

+static Selection sel;

 static CSIEscape csiescseq;
 static STREscape strescseq;
 static CSIEscape csiescseq;
 static STREscape strescseq;

+static int iofd = 1;

 static int cmdfd;
 static pid_t pid;
 static int cmdfd;
 static pid_t pid;

-static Selection sel;
-static int iofd = -1;
-static char **opt_cmd = NULL;
-static char *opt_io = NULL;
-static char *opt_title = NULL;
-static char *opt_embed = NULL;
-static char *opt_class = NULL;
-static char *opt_font = NULL;

 
 

-static char *usedfont = NULL;
-static int usedfontsize = 0;
+static const uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
+static const uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
+static const Rune utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
+static const Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};

 
 ssize_t
 
 ssize_t

-xwrite(int fd, char *s, size_t len) {
+xwrite(int fd, const char *s, size_t len)
+{

        size_t aux = len;
        size_t aux = len;

+       ssize_t r;

 
 

-       while(len > 0) {
-               ssize_t r = write(fd, s, len);
-               if(r < 0)
+       while (len > 0) {
+               r = write(fd, s, len);
+               if (r < 0)

                        return r;
                len -= r;
                s += r;
        }
                        return r;
                len -= r;
                s += r;
        }

+

        return aux;
 }
 
 void *
        return aux;
 }
 
 void *

-xmalloc(size_t len) {
-       void *p = malloc(len);
+xmalloc(size_t len)
+{
+       void *p;

 
 

-       if(!p)
-               die("Out of memory\n");
+       if (!(p = malloc(len)))
+               die("malloc: %s\n", strerror(errno));

 
        return p;
 }
 
 void *
 
        return p;
 }
 
 void *

-xrealloc(void *p, size_t len) {
-       if((p = realloc(p, len)) == NULL)
-               die("Out of memory\n");
+xrealloc(void *p, size_t len)
+{
+       if ((p = realloc(p, len)) == NULL)
+               die("realloc: %s\n", strerror(errno));

 
        return p;
 }
 
 
        return p;
 }
 

-void *
-xcalloc(size_t nmemb, size_t size) {
-       void *p = calloc(nmemb, size);
+char *
+xstrdup(const char *s)
+{
+       char *p;

 
 

-       if(!p)
-               die("Out of memory\n");
+       if ((p = strdup(s)) == NULL)
+               die("strdup: %s\n", strerror(errno));

 
        return p;
 }
 
 
        return p;
 }
 

-int
-utf8decode(char *s, long *u) {
-       uchar c;
-       int i, n, rtn;
-
-       rtn = 1;
-       c = *s;
-       if(~c & B7) { /* 0xxxxxxx */
-               *u = c;
-               return rtn;
-       } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
-               *u = c&(B4|B3|B2|B1|B0);
-               n = 1;
-       } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
-               *u = c&(B3|B2|B1|B0);
-               n = 2;
-       } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
-               *u = c & (B2|B1|B0);
-               n = 3;
-       } else {
-               goto invalid;
-       }
-
-       for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
-               c = *s;
-               if((c & (B7|B6)) != B7) /* 10xxxxxx */
-                       goto invalid;
-               *u <<= 6;
-               *u |= c & (B5|B4|B3|B2|B1|B0);
-       }
-
-       if((n == 1 && *u < 0x80) ||
-          (n == 2 && *u < 0x800) ||
-          (n == 3 && *u < 0x10000) ||
-          (*u >= 0xD800 && *u <= 0xDFFF)) {
-               goto invalid;
-       }
-
-       return rtn;
-invalid:
-       *u = 0xFFFD;
-
-       return rtn;
-}
+size_t
+utf8decode(const char *c, Rune *u, size_t clen)
+{
+       size_t i, j, len, type;
+       Rune udecoded;

 
 

-int
-utf8encode(long *u, char *s) {
-       uchar *sp;
-       ulong uc;
-       int i, n;
-
-       sp = (uchar *)s;
-       uc = *u;
-       if(uc < 0x80) {
-               *sp = uc; /* 0xxxxxxx */
+       *u = UTF_INVALID;
+       if (!clen)
+               return 0;
+       udecoded = utf8decodebyte(c[0], &len);
+       if (!BETWEEN(len, 1, UTF_SIZ))

                return 1;
                return 1;

-       } else if(*u < 0x800) {
-               *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
-               n = 1;
-       } else if(uc < 0x10000) {
-               *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
-               n = 2;
-       } else if(uc <= 0x10FFFF) {
-               *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
-               n = 3;
-       } else {
-               goto invalid;
+       for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
+               udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
+               if (type != 0)
+                       return j;

        }
        }

+       if (j < len)
+               return 0;
+       *u = udecoded;
+       utf8validate(u, len);

 
 

-       for(i=n,++sp; i>0; --i,++sp)
-               *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
+       return len;
+}

 
 

-       return n+1;
-invalid:
-       /* U+FFFD */
-       *s++ = '\xEF';
-       *s++ = '\xBF';
-       *s = '\xBD';
+Rune
+utf8decodebyte(char c, size_t *i)
+{
+       for (*i = 0; *i < LEN(utfmask); ++(*i))
+               if (((uchar)c & utfmask[*i]) == utfbyte[*i])
+                       return (uchar)c & ~utfmask[*i];

 
 

-       return 3;
+       return 0;

 }
 
 }
 

-/* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
-   UTF-8 otherwise return 0 */
-int
-isfullutf8(char *s, int b) {
-       uchar *c1, *c2, *c3;
+size_t
+utf8encode(Rune u, char *c)
+{
+       size_t len, i;

 
 

-       c1 = (uchar *)s;
-       c2 = (uchar *)++s;
-       c3 = (uchar *)++s;
-       if(b < 1) {
-               return 0;
-       } else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1) {
+       len = utf8validate(&u, 0);
+       if (len > UTF_SIZ)

                return 0;
                return 0;

-       } else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
-           ((b == 1) ||
-           ((b == 2) && (*c2&(B7|B6)) == B7))) {
-               return 0;
-       } else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
-           ((b == 1) ||
-           ((b == 2) && (*c2&(B7|B6)) == B7) ||
-           ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7))) {
-               return 0;
-       } else {
-               return 1;
-       }
-}
-
-int
-utf8size(char *s) {
-       uchar c = *s;

 
 

-       if(~c&B7) {
-               return 1;
-       } else if((c&(B7|B6|B5)) == (B7|B6)) {
-               return 2;
-       } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) {
-               return 3;
-       } else {
-               return 4;
+       for (i = len - 1; i != 0; --i) {
+               c[i] = utf8encodebyte(u, 0);
+               u >>= 6;

        }
        }

-}
+       c[0] = utf8encodebyte(u, len);

 
 

-void
-selinit(void) {
-       memset(&sel.tclick1, 0, sizeof(sel.tclick1));
-       memset(&sel.tclick2, 0, sizeof(sel.tclick2));
-       sel.mode = 0;
-       sel.bx = -1;
-       sel.clip = NULL;
-       sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
-       if(sel.xtarget == None)
-               sel.xtarget = XA_STRING;
+       return len;

 }
 
 }
 

-static int
-x2col(int x) {
-       x -= borderpx;
-       x /= xw.cw;
-
-       return LIMIT(x, 0, term.col-1);
+char
+utf8encodebyte(Rune u, size_t i)
+{
+       return utfbyte[i] | (u & ~utfmask[i]);

 }
 
 }
 

-static int
-y2row(int y) {
-       y -= borderpx;
-       y /= xw.ch;
+size_t
+utf8validate(Rune *u, size_t i)
+{
+       if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
+               *u = UTF_INVALID;
+       for (i = 1; *u > utfmax[i]; ++i)
+               ;
+
+       return i;
+}
+
+static const char base64_digits[] = {
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, 0, 0, 0,
+       63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, 0, -1, 0, 0, 0, 0, 1,
+       2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
+       22, 23, 24, 25, 0, 0, 0, 0, 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34,
+       35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};

 
 

-       return LIMIT(y, 0, term.row-1);
+char
+base64dec_getc(const char **src)
+{
+       while (**src && !isprint(**src))
+               (*src)++;
+       return **src ? *((*src)++) : '=';  /* emulate padding if string ends */

 }
 
 }
 

-static inline bool
-selected(int x, int y) {
-       int bx, ex;
+char *
+base64dec(const char *src)
+{
+       size_t in_len = strlen(src);
+       char *result, *dst;
+
+       if (in_len % 4)
+               in_len += 4 - (in_len % 4);
+       result = dst = xmalloc(in_len / 4 * 3 + 1);
+       while (*src) {
+               int a = base64_digits[(unsigned char) base64dec_getc(&src)];
+               int b = base64_digits[(unsigned char) base64dec_getc(&src)];
+               int c = base64_digits[(unsigned char) base64dec_getc(&src)];
+               int d = base64_digits[(unsigned char) base64dec_getc(&src)];
+
+               /* invalid input. 'a' can be -1, e.g. if src is "\n" (c-str) */
+               if (a == -1 || b == -1)
+                       break;

 
 

-       if(sel.ey == y && sel.by == y) {
-               bx = MIN(sel.bx, sel.ex);
-               ex = MAX(sel.bx, sel.ex);
-               return BETWEEN(x, bx, ex);
+               *dst++ = (a << 2) | ((b & 0x30) >> 4);
+               if (c == -1)
+                       break;
+               *dst++ = ((b & 0x0f) << 4) | ((c & 0x3c) >> 2);
+               if (d == -1)
+                       break;
+               *dst++ = ((c & 0x03) << 6) | d;

        }
        }

-
-       return ((sel.b.y < y && y < sel.e.y)
-                       || (y == sel.e.y && x <= sel.e.x))
-                       || (y == sel.b.y && x >= sel.b.x
-                               && (x <= sel.e.x || sel.b.y != sel.e.y));
+       *dst = '\0';
+       return result;

 }
 
 void
 }
 
 void

-getbuttoninfo(XEvent *e) {
-       sel.ex = x2col(e->xbutton.x);
-       sel.ey = y2row(e->xbutton.y);
-
-       sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
-       sel.b.y = MIN(sel.by, sel.ey);
-       sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
-       sel.e.y = MAX(sel.by, sel.ey);
+selinit(void)
+{
+       sel.mode = SEL_IDLE;
+       sel.snap = 0;
+       sel.ob.x = -1;

 }
 
 }
 

-void
-mousereport(XEvent *e) {
-       int x = x2col(e->xbutton.x);
-       int y = y2row(e->xbutton.y);
-       int button = e->xbutton.button;
-       int state = e->xbutton.state;
-       char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
-       static int ob, ox, oy;
+int
+tlinelen(int y)
+{
+       int i = term.col;

 
 

-       /* from urxvt */
-       if(e->xbutton.type == MotionNotify) {
-               if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
-                       return;
-               button = ob + 32;
-               ox = x, oy = y;
-       } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
-               button = 3;
-       } else {
-               button -= Button1;
-               if(button >= 3)
-                       button += 64 - 3;
-               if(e->xbutton.type == ButtonPress) {
-                       ob = button;
-                       ox = x, oy = y;
-               }
-       }
+       if (term.line[y][i - 1].mode & ATTR_WRAP)
+               return i;

 
 

-       buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
-               + (state & Mod4Mask    ? 8  : 0)
-               + (state & ControlMask ? 16 : 0);
+       while (i > 0 && term.line[y][i - 1].u == ' ')
+               --i;

 
 

-       ttywrite(buf, sizeof(buf));
+       return i;

 }
 
 void
 }
 
 void

-bpress(XEvent *e) {
-       if(IS_SET(MODE_MOUSE)) {
-               mousereport(e);
-       } else if(e->xbutton.button == Button1) {
-               if(sel.bx != -1) {
-                       sel.bx = -1;
-                       tsetdirt(sel.b.y, sel.e.y);
-                       draw();
-               }
-               sel.mode = 1;
-               sel.ex = sel.bx = x2col(e->xbutton.x);
-               sel.ey = sel.by = y2row(e->xbutton.y);
-       } else if(e->xbutton.button == Button4) {
-               ttywrite("\031", 1);
-       } else if(e->xbutton.button == Button5) {
-               ttywrite("\005", 1);
-       }
+selstart(int col, int row, int snap)
+{
+       selclear();
+       sel.mode = SEL_EMPTY;
+       sel.type = SEL_REGULAR;
+       sel.alt = IS_SET(MODE_ALTSCREEN);
+       sel.snap = snap;
+       sel.oe.x = sel.ob.x = col;
+       sel.oe.y = sel.ob.y = row;
+       selnormalize();
+
+       if (sel.snap != 0)
+               sel.mode = SEL_READY;
+       tsetdirt(sel.nb.y, sel.ne.y);

 }
 
 void
 }
 
 void

-selcopy(void) {
-       char *str, *ptr, *p;
-       int x, y, bufsize, is_selected = 0, size;
-       Glyph *gp, *last;
+selextend(int col, int row, int type, int done)
+{
+       int oldey, oldex, oldsby, oldsey, oldtype;

 
 

-       if(sel.bx == -1) {
-               str = NULL;
-       } else {
-               bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
-               ptr = str = xmalloc(bufsize);
+       if (sel.mode == SEL_IDLE)
+               return;
+       if (done && sel.mode == SEL_EMPTY) {
+               selclear();
+               return;
+       }

 
 

-               /* append every set & selected glyph to the selection */
-               for(y = 0; y < term.row; y++) {
-                       gp = &term.line[y][0];
-                       last = gp + term.col;
+       oldey = sel.oe.y;
+       oldex = sel.oe.x;
+       oldsby = sel.nb.y;
+       oldsey = sel.ne.y;
+       oldtype = sel.type;

 
 

-                       while(--last >= gp && !(last->state & GLYPH_SET))
-                               /* nothing */;
+       sel.oe.x = col;
+       sel.oe.y = row;
+       selnormalize();
+       sel.type = type;

 
 

-                       for(x = 0; gp <= last; x++, ++gp) {
-                               if(!(is_selected = selected(x, y)))
-                                       continue;
+       if (oldey != sel.oe.y || oldex != sel.oe.x || oldtype != sel.type || sel.mode == SEL_EMPTY)
+               tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));

 
 

-                               p = (gp->state & GLYPH_SET) ? gp->c : " ";
-                               size = utf8size(p);
-                               memcpy(ptr, p, size);
-                               ptr += size;
-                       }
-                       /* \n at the end of every selected line except for the last one */
-                       if(is_selected && y < sel.e.y)
-                               *ptr++ = '\n';
-               }
-               *ptr = 0;
-       }
-       sel.alt = IS_SET(MODE_ALTSCREEN);
-       xsetsel(str);
+       sel.mode = done ? SEL_IDLE : SEL_READY;

 }
 
 void
 }
 
 void

-selnotify(XEvent *e) {
-       ulong nitems, ofs, rem;
-       int format;
-       uchar *data;
-       Atom type;
+selnormalize(void)
+{
+       int i;

 
 

-       ofs = 0;
-       do {
-               if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
-                                       False, AnyPropertyType, &type, &format,
-                                       &nitems, &rem, &data)) {
-                       fprintf(stderr, "Clipboard allocation failed\n");
-                       return;
-               }
-               ttywrite((const char *) data, nitems * format / 8);
-               XFree(data);
-               /* number of 32-bit chunks returned */
-               ofs += nitems * format / 32;
-       } while(rem > 0);
-}
+       if (sel.type == SEL_REGULAR && sel.ob.y != sel.oe.y) {
+               sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
+               sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
+       } else {
+               sel.nb.x = MIN(sel.ob.x, sel.oe.x);
+               sel.ne.x = MAX(sel.ob.x, sel.oe.x);
+       }
+       sel.nb.y = MIN(sel.ob.y, sel.oe.y);
+       sel.ne.y = MAX(sel.ob.y, sel.oe.y);

 
 

-void
-selpaste(const Arg *dummy) {
-       XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
-                       xw.win, CurrentTime);
-}
+       selsnap(&sel.nb.x, &sel.nb.y, -1);
+       selsnap(&sel.ne.x, &sel.ne.y, +1);

 
 

-void selclear(XEvent *e) {
-       if(sel.bx == -1)
+       /* expand selection over line breaks */
+       if (sel.type == SEL_RECTANGULAR)

                return;
                return;

-       sel.bx = -1;
-       tsetdirt(sel.b.y, sel.e.y);
+       i = tlinelen(sel.nb.y);
+       if (i < sel.nb.x)
+               sel.nb.x = i;
+       if (tlinelen(sel.ne.y) <= sel.ne.x)
+               sel.ne.x = term.col - 1;

 }
 
 }
 

-void
-selrequest(XEvent *e) {
-       XSelectionRequestEvent *xsre;
-       XSelectionEvent xev;
-       Atom xa_targets, string;
-
-       xsre = (XSelectionRequestEvent *) e;
-       xev.type = SelectionNotify;
-       xev.requestor = xsre->requestor;
-       xev.selection = xsre->selection;
-       xev.target = xsre->target;
-       xev.time = xsre->time;
-       /* reject */
-       xev.property = None;
+int
+selected(int x, int y)
+{
+       if (sel.mode == SEL_EMPTY || sel.ob.x == -1 ||
+                       sel.alt != IS_SET(MODE_ALTSCREEN))
+               return 0;

 
 

-       xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
-       if(xsre->target == xa_targets) {
-               /* respond with the supported type */
-               string = sel.xtarget;
-               XChangeProperty(xsre->display, xsre->requestor, xsre->property,
-                               XA_ATOM, 32, PropModeReplace,
-                               (uchar *) &string, 1);
-               xev.property = xsre->property;
-       } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
-               XChangeProperty(xsre->display, xsre->requestor, xsre->property,
-                               xsre->target, 8, PropModeReplace,
-                               (uchar *) sel.clip, strlen(sel.clip));
-               xev.property = xsre->property;
-       }
+       if (sel.type == SEL_RECTANGULAR)
+               return BETWEEN(y, sel.nb.y, sel.ne.y)
+                   && BETWEEN(x, sel.nb.x, sel.ne.x);

 
 

-       /* all done, send a notification to the listener */
-       if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
-               fprintf(stderr, "Error sending SelectionNotify event\n");
+       return BETWEEN(y, sel.nb.y, sel.ne.y)
+           && (y != sel.nb.y || x >= sel.nb.x)
+           && (y != sel.ne.y || x <= sel.ne.x);

 }
 
 void
 }
 
 void

-xsetsel(char *str) {
-       /* register the selection for both the clipboard and the primary */
-       Atom clipboard;
-
-       free(sel.clip);
-       sel.clip = str;
+selsnap(int *x, int *y, int direction)
+{
+       int newx, newy, xt, yt;
+       int delim, prevdelim;
+       const Glyph *gp, *prevgp;

 
 

-       XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
+       switch (sel.snap) {
+       case SNAP_WORD:
+               /*
+                * Snap around if the word wraps around at the end or
+                * beginning of a line.
+                */
+               prevgp = &term.line[*y][*x];
+               prevdelim = ISDELIM(prevgp->u);
+               for (;;) {
+                       newx = *x + direction;
+                       newy = *y;
+                       if (!BETWEEN(newx, 0, term.col - 1)) {
+                               newy += direction;
+                               newx = (newx + term.col) % term.col;
+                               if (!BETWEEN(newy, 0, term.row - 1))
+                                       break;

 
 

-       clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
-       XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
-}
+                               if (direction > 0)
+                                       yt = *y, xt = *x;
+                               else
+                                       yt = newy, xt = newx;
+                               if (!(term.line[yt][xt].mode & ATTR_WRAP))
+                                       break;
+                       }

 
 

-void
-brelease(XEvent *e) {
-       struct timeval now;
+                       if (newx >= tlinelen(newy))
+                               break;

 
 

-       if(IS_SET(MODE_MOUSE)) {
-               mousereport(e);
-               return;
-       }
+                       gp = &term.line[newy][newx];
+                       delim = ISDELIM(gp->u);
+                       if (!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
+                                       || (delim && gp->u != prevgp->u)))
+                               break;

 
 

-       if(e->xbutton.button == Button2) {
-               selpaste(NULL);
-       } else if(e->xbutton.button == Button1) {
-               sel.mode = 0;
-               getbuttoninfo(e);
-               term.dirty[sel.ey] = 1;
-               if(sel.bx == sel.ex && sel.by == sel.ey) {
-                       sel.bx = -1;
-                       gettimeofday(&now, NULL);
-
-                       if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
-                               /* triple click on the line */
-                               sel.b.x = sel.bx = 0;
-                               sel.e.x = sel.ex = term.col;
-                               sel.b.y = sel.e.y = sel.ey;
-                               selcopy();
-                       } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
-                               /* double click to select word */
-                               sel.bx = sel.ex;
-                               while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
-                                               term.line[sel.ey][sel.bx-1].c[0] != ' ') {
-                                       sel.bx--;
+                       *x = newx;
+                       *y = newy;
+                       prevgp = gp;
+                       prevdelim = delim;
+               }
+               break;
+       case SNAP_LINE:
+               /*
+                * Snap around if the the previous line or the current one
+                * has set ATTR_WRAP at its end. Then the whole next or
+                * previous line will be selected.
+                */
+               *x = (direction < 0) ? 0 : term.col - 1;
+               if (direction < 0) {
+                       for (; *y > 0; *y += direction) {
+                               if (!(term.line[*y-1][term.col-1].mode
+                                               & ATTR_WRAP)) {
+                                       break;

                                }
                                }

-                               sel.b.x = sel.bx;
-                               while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
-                                               term.line[sel.ey][sel.ex+1].c[0] != ' ') {
-                                       sel.ex++;
+                       }
+               } else if (direction > 0) {
+                       for (; *y < term.row-1; *y += direction) {
+                               if (!(term.line[*y][term.col-1].mode
+                                               & ATTR_WRAP)) {
+                                       break;

                                }
                                }

-                               sel.e.x = sel.ex;
-                               sel.b.y = sel.e.y = sel.ey;
-                               selcopy();

                        }
                        }

-               } else {
-                       selcopy();

                }
                }

+               break;

        }
        }

-
-       memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
-       gettimeofday(&sel.tclick1, NULL);

 }
 
 }
 

-void
-bmotion(XEvent *e) {
-       int starty, endy, oldey, oldex;
+char *
+getsel(void)
+{
+       char *str, *ptr;
+       int y, bufsize, lastx, linelen;
+       const Glyph *gp, *last;

 
 

-       if(IS_SET(MODE_MOUSE)) {
-               mousereport(e);
-               return;
-       }
+       if (sel.ob.x == -1)
+               return NULL;
+
+       bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
+       ptr = str = xmalloc(bufsize);
+
+       /* append every set & selected glyph to the selection */
+       for (y = sel.nb.y; y <= sel.ne.y; y++) {
+               if ((linelen = tlinelen(y)) == 0) {
+                       *ptr++ = '\n';
+                       continue;
+               }
+
+               if (sel.type == SEL_RECTANGULAR) {
+                       gp = &term.line[y][sel.nb.x];
+                       lastx = sel.ne.x;
+               } else {
+                       gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
+                       lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
+               }
+               last = &term.line[y][MIN(lastx, linelen-1)];
+               while (last >= gp && last->u == ' ')
+                       --last;

 
 

-       if(sel.mode) {
-               oldey = sel.ey;
-               oldex = sel.ex;
-               getbuttoninfo(e);
+               for ( ; gp <= last; ++gp) {
+                       if (gp->mode & ATTR_WDUMMY)
+                               continue;

 
 

-               if(oldey != sel.ey || oldex != sel.ex) {
-                       starty = MIN(oldey, sel.ey);
-                       endy = MAX(oldey, sel.ey);
-                       tsetdirt(starty, endy);
+                       ptr += utf8encode(gp->u, ptr);

                }
                }

+
+               /*
+                * Copy and pasting of line endings is inconsistent
+                * in the inconsistent terminal and GUI world.
+                * The best solution seems like to produce '\n' when
+                * something is copied from st and convert '\n' to
+                * '\r', when something to be pasted is received by
+                * st.
+                * FIXME: Fix the computer world.
+                */
+               if ((y < sel.ne.y || lastx >= linelen) &&
+                   (!(last->mode & ATTR_WRAP) || sel.type == SEL_RECTANGULAR))
+                       *ptr++ = '\n';

        }
        }

+       *ptr = 0;
+       return str;
+}
+
+void
+selclear(void)
+{
+       if (sel.ob.x == -1)
+               return;
+       sel.mode = SEL_IDLE;
+       sel.ob.x = -1;
+       tsetdirt(sel.nb.y, sel.ne.y);

 }
 
 void
 }
 
 void

-die(const char *errstr, ...) {
+die(const char *errstr, ...)
+{

        va_list ap;
 
        va_start(ap, errstr);
        vfprintf(stderr, errstr, ap);
        va_end(ap);
        va_list ap;
 
        va_start(ap, errstr);
        vfprintf(stderr, errstr, ap);
        va_end(ap);

-       exit(EXIT_FAILURE);
+       exit(1);

 }
 
 void
 }
 
 void

-execsh(void) {
-       char **args;
-       char *envshell = getenv("SHELL");
-       const struct passwd *pass = getpwuid(getuid());
-       char buf[sizeof(long) * 8 + 1];
+execsh(char *cmd, char **args)
+{
+       char *sh, *prog, *arg;
+       const struct passwd *pw;
+
+       errno = 0;
+       if ((pw = getpwuid(getuid())) == NULL) {
+               if (errno)
+                       die("getpwuid: %s\n", strerror(errno));
+               else
+                       die("who are you?\n");
+       }
+
+       if ((sh = getenv("SHELL")) == NULL)
+               sh = (pw->pw_shell[0]) ? pw->pw_shell : cmd;
+
+       if (args) {
+               prog = args[0];
+               arg = NULL;
+       } else if (scroll) {
+               prog = scroll;
+               arg = utmp ? utmp : sh;
+       } else if (utmp) {
+               prog = utmp;
+               arg = NULL;
+       } else {
+               prog = sh;
+               arg = NULL;
+       }
+       DEFAULT(args, ((char *[]) {prog, arg, NULL}));

 
        unsetenv("COLUMNS");
        unsetenv("LINES");
        unsetenv("TERMCAP");
 
        unsetenv("COLUMNS");
        unsetenv("LINES");
        unsetenv("TERMCAP");

-
-       if(pass) {
-               setenv("LOGNAME", pass->pw_name, 1);
-               setenv("USER", pass->pw_name, 1);
-               setenv("SHELL", pass->pw_shell, 0);
-               setenv("HOME", pass->pw_dir, 0);
-       }
-
-       snprintf(buf, sizeof(buf), "%lu", xw.win);
-       setenv("WINDOWID", buf, 1);
+       setenv("LOGNAME", pw->pw_name, 1);
+       setenv("USER", pw->pw_name, 1);
+       setenv("SHELL", sh, 1);
+       setenv("HOME", pw->pw_dir, 1);
+       setenv("TERM", termname, 1);

 
        signal(SIGCHLD, SIG_DFL);
        signal(SIGHUP, SIG_DFL);
 
        signal(SIGCHLD, SIG_DFL);
        signal(SIGHUP, SIG_DFL);


@@ -918,153 +712,311 @@ execsh(void) {
        signal(SIGTERM, SIG_DFL);
        signal(SIGALRM, SIG_DFL);
 
        signal(SIGTERM, SIG_DFL);
        signal(SIGALRM, SIG_DFL);
 

-       DEFAULT(envshell, shell);
-       setenv("TERM", termname, 1);
-       args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
-       execvp(args[0], args);
-       exit(EXIT_FAILURE);
+       execvp(prog, args);
+       _exit(1);

 }
 
 void
 }
 
 void

-sigchld(int a) {
-       int stat = 0;
+sigchld(int a)
+{
+       int stat;
+       pid_t p;

 
 

-       if(waitpid(pid, &stat, 0) < 0)
-               die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
+       if ((p = waitpid(pid, &stat, WNOHANG)) < 0)
+               die("waiting for pid %hd failed: %s\n", pid, strerror(errno));

 
 

-       if(WIFEXITED(stat)) {
-               exit(WEXITSTATUS(stat));
-       } else {
-               exit(EXIT_FAILURE);
-       }
+       if (pid != p)
+               return;
+
+       if (WIFEXITED(stat) && WEXITSTATUS(stat))
+               die("child exited with status %d\n", WEXITSTATUS(stat));
+       else if (WIFSIGNALED(stat))
+               die("child terminated due to signal %d\n", WTERMSIG(stat));
+       _exit(0);

 }
 
 void
 }
 
 void

-ttynew(void) {
+stty(char **args)
+{
+       char cmd[_POSIX_ARG_MAX], **p, *q, *s;
+       size_t n, siz;
+
+       if ((n = strlen(stty_args)) > sizeof(cmd)-1)
+               die("incorrect stty parameters\n");
+       memcpy(cmd, stty_args, n);
+       q = cmd + n;
+       siz = sizeof(cmd) - n;
+       for (p = args; p && (s = *p); ++p) {
+               if ((n = strlen(s)) > siz-1)
+                       die("stty parameter length too long\n");
+               *q++ = ' ';
+               memcpy(q, s, n);
+               q += n;
+               siz -= n + 1;
+       }
+       *q = '\0';
+       if (system(cmd) != 0)
+               perror("Couldn't call stty");
+}
+
+int
+ttynew(const char *line, char *cmd, const char *out, char **args)
+{

        int m, s;
        int m, s;

-       struct winsize w = {term.row, term.col, 0, 0};
+
+       if (out) {
+               term.mode |= MODE_PRINT;
+               iofd = (!strcmp(out, "-")) ?
+                         1 : open(out, O_WRONLY | O_CREAT, 0666);
+               if (iofd < 0) {
+                       fprintf(stderr, "Error opening %s:%s\n",
+                               out, strerror(errno));
+               }
+       }
+
+       if (line) {
+               if ((cmdfd = open(line, O_RDWR)) < 0)
+                       die("open line '%s' failed: %s\n",
+                           line, strerror(errno));
+               dup2(cmdfd, 0);
+               stty(args);
+               return cmdfd;
+       }

 
        /* seems to work fine on linux, openbsd and freebsd */
 
        /* seems to work fine on linux, openbsd and freebsd */

-       if(openpty(&m, &s, NULL, NULL, &w) < 0)
-               die("openpty failed: %s\n", SERRNO);
+       if (openpty(&m, &s, NULL, NULL, NULL) < 0)
+               die("openpty failed: %s\n", strerror(errno));

 
 

-       switch(pid = fork()) {
+       switch (pid = fork()) {

        case -1:
        case -1:

-               die("fork failed\n");
+               die("fork failed: %s\n", strerror(errno));

                break;
        case 0:
                break;
        case 0:

-               setsid(); /* create a new process group */
-               dup2(s, STDIN_FILENO);
-               dup2(s, STDOUT_FILENO);
-               dup2(s, STDERR_FILENO);
-               if(ioctl(s, TIOCSCTTY, NULL) < 0)
-                       die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
-               close(s);
+               close(iofd);

                close(m);
                close(m);

-               execsh();
+               setsid(); /* create a new process group */
+               dup2(s, 0);
+               dup2(s, 1);
+               dup2(s, 2);
+               if (ioctl(s, TIOCSCTTY, NULL) < 0)
+                       die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
+               if (s > 2)
+                       close(s);
+#ifdef __OpenBSD__
+               if (pledge("stdio getpw proc exec", NULL) == -1)
+                       die("pledge\n");
+#endif
+               execsh(cmd, args);

                break;
        default:
                break;
        default:

+#ifdef __OpenBSD__
+               if (pledge("stdio rpath tty proc", NULL) == -1)
+                       die("pledge\n");
+#endif

                close(s);
                cmdfd = m;
                signal(SIGCHLD, sigchld);
                close(s);
                cmdfd = m;
                signal(SIGCHLD, sigchld);

-               if(opt_io) {
-                       iofd = (!strcmp(opt_io, "-")) ?
-                                 STDOUT_FILENO :
-                                 open(opt_io, O_WRONLY | O_CREAT, 0666);
-                       if(iofd < 0) {
-                               fprintf(stderr, "Error opening %s:%s\n",
-                                       opt_io, strerror(errno));
-                       }
-               }
+               break;

        }
        }

+       return cmdfd;

 }
 
 }
 

-void
-dump(char c) {
-       static int col;
-
-       fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
-       if(++col % 10 == 0)
-               fprintf(stderr, "\n");
-}
-
-void
-ttyread(void) {
+size_t
+ttyread(void)
+{

        static char buf[BUFSIZ];
        static int buflen = 0;
        static char buf[BUFSIZ];
        static int buflen = 0;

-       char *ptr;
-       char s[UTF_SIZ];
-       int charsize; /* size of utf8 char in bytes */
-       long utf8c;
-       int ret;
+       int ret, written;

 
        /* append read bytes to unprocessed bytes */
 
        /* append read bytes to unprocessed bytes */

-       if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
-               die("Couldn't read from shell: %s\n", SERRNO);
+       ret = read(cmdfd, buf+buflen, LEN(buf)-buflen);

 
 

-       /* process every complete utf8 char */
-       buflen += ret;
-       ptr = buf;
-       while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
-               charsize = utf8decode(ptr, &utf8c);
-               utf8encode(&utf8c, s);
-               tputc(s, charsize);
-               ptr += charsize;
-               buflen -= charsize;
+       switch (ret) {
+       case 0:
+               exit(0);
+       case -1:
+               die("couldn't read from shell: %s\n", strerror(errno));
+       default:
+               buflen += ret;
+               written = twrite(buf, buflen, 0);
+               buflen -= written;
+               /* keep any incomplete UTF-8 byte sequence for the next call */
+               if (buflen > 0)
+                       memmove(buf, buf + written, buflen);
+               return ret;

        }
        }

-
-       /* keep any uncomplete utf8 char for the next call */
-       memmove(buf, ptr, buflen);

 }
 
 void
 }
 
 void

-ttywrite(const char *s, size_t n) {
-       if(write(cmdfd, s, n) == -1)
-               die("write error on tty: %s\n", SERRNO);
-}
+ttywrite(const char *s, size_t n, int may_echo)
+{
+       const char *next;

 
 

-void
-ttyresize(void) {
-       struct winsize w;
+       if (may_echo && IS_SET(MODE_ECHO))
+               twrite(s, n, 1);

 
 

-       w.ws_row = term.row;
-       w.ws_col = term.col;
-       w.ws_xpixel = xw.tw;
-       w.ws_ypixel = xw.th;
-       if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
-               fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
+       if (!IS_SET(MODE_CRLF)) {
+               ttywriteraw(s, n);
+               return;
+       }
+
+       /* This is similar to how the kernel handles ONLCR for ttys */
+       while (n > 0) {
+               if (*s == '\r') {
+                       next = s + 1;
+                       ttywriteraw("\r\n", 2);
+               } else {
+                       next = memchr(s, '\r', n);
+                       DEFAULT(next, s + n);
+                       ttywriteraw(s, next - s);
+               }
+               n -= next - s;
+               s = next;
+       }

 }
 
 void
 }
 
 void

-tsetdirt(int top, int bot) {
-       int i;
-
-       LIMIT(top, 0, term.row-1);
-       LIMIT(bot, 0, term.row-1);
+ttywriteraw(const char *s, size_t n)
+{
+       fd_set wfd, rfd;
+       ssize_t r;
+       size_t lim = 256;

 
 

-       for(i = top; i <= bot; i++)
-               term.dirty[i] = 1;
+       /*
+        * Remember that we are using a pty, which might be a modem line.
+        * Writing too much will clog the line. That's why we are doing this
+        * dance.
+        * FIXME: Migrate the world to Plan 9.
+        */
+       while (n > 0) {
+               FD_ZERO(&wfd);
+               FD_ZERO(&rfd);
+               FD_SET(cmdfd, &wfd);
+               FD_SET(cmdfd, &rfd);
+
+               /* Check if we can write. */
+               if (pselect(cmdfd+1, &rfd, &wfd, NULL, NULL, NULL) < 0) {
+                       if (errno == EINTR)
+                               continue;
+                       die("select failed: %s\n", strerror(errno));
+               }
+               if (FD_ISSET(cmdfd, &wfd)) {
+                       /*
+                        * Only write the bytes written by ttywrite() or the
+                        * default of 256. This seems to be a reasonable value
+                        * for a serial line. Bigger values might clog the I/O.
+                        */
+                       if ((r = write(cmdfd, s, (n < lim)? n : lim)) < 0)
+                               goto write_error;
+                       if (r < n) {
+                               /*
+                                * We weren't able to write out everything.
+                                * This means the buffer is getting full
+                                * again. Empty it.
+                                */
+                               if (n < lim)
+                                       lim = ttyread();
+                               n -= r;
+                               s += r;
+                       } else {
+                               /* All bytes have been written. */
+                               break;
+                       }
+               }
+               if (FD_ISSET(cmdfd, &rfd))
+                       lim = ttyread();
+       }
+       return;
+
+write_error:
+       die("write error on tty: %s\n", strerror(errno));
+}
+
+void
+ttyresize(int tw, int th)
+{
+       struct winsize w;
+
+       w.ws_row = term.row;
+       w.ws_col = term.col;
+       w.ws_xpixel = tw;
+       w.ws_ypixel = th;
+       if (ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
+               fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
+}
+
+void
+ttyhangup()
+{
+       /* Send SIGHUP to shell */
+       kill(pid, SIGHUP);
+}
+
+int
+tattrset(int attr)
+{
+       int i, j;
+
+       for (i = 0; i < term.row-1; i++) {
+               for (j = 0; j < term.col-1; j++) {
+                       if (term.line[i][j].mode & attr)
+                               return 1;
+               }
+       }
+
+       return 0;
+}
+
+void
+tsetdirt(int top, int bot)
+{
+       int i;
+
+       LIMIT(top, 0, term.row-1);
+       LIMIT(bot, 0, term.row-1);
+
+       for (i = top; i <= bot; i++)
+               term.dirty[i] = 1;
+}
+
+void
+tsetdirtattr(int attr)
+{
+       int i, j;
+
+       for (i = 0; i < term.row-1; i++) {
+               for (j = 0; j < term.col-1; j++) {
+                       if (term.line[i][j].mode & attr) {
+                               tsetdirt(i, i);
+                               break;
+                       }
+               }
+       }

 }
 
 void
 }
 
 void

-tfulldirt(void) {
+tfulldirt(void)
+{

        tsetdirt(0, term.row-1);
 }
 
 void
        tsetdirt(0, term.row-1);
 }
 
 void

-tcursor(int mode) {
-       static TCursor c;
+tcursor(int mode)
+{
+       static TCursor c[2];
+       int alt = IS_SET(MODE_ALTSCREEN);

 
 

-       if(mode == CURSOR_SAVE) {
-               c = term.c;
-       } else if(mode == CURSOR_LOAD) {
-               term.c = c;
-               tmoveto(c.x, c.y);
+       if (mode == CURSOR_SAVE) {
+               c[alt] = term.c;
+       } else if (mode == CURSOR_LOAD) {
+               term.c = c[alt];
+               tmoveto(c[alt].x, c[alt].y);

        }
 }
 
 void
        }
 }
 
 void

-treset(void) {
+treset(void)
+{

        uint i;
 
        term.c = (TCursor){{
        uint i;
 
        term.c = (TCursor){{


@@ -1074,39 +1026,33 @@ treset(void) {
        }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 
        memset(term.tabs, 0, term.col * sizeof(*term.tabs));
        }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 
        memset(term.tabs, 0, term.col * sizeof(*term.tabs));

-       for(i = tabspaces; i < term.col; i += tabspaces)
+       for (i = tabspaces; i < term.col; i += tabspaces)

                term.tabs[i] = 1;
        term.top = 0;
        term.bot = term.row - 1;
                term.tabs[i] = 1;
        term.top = 0;
        term.bot = term.row - 1;

-       term.mode = MODE_WRAP;
+       term.mode = MODE_WRAP|MODE_UTF8;
+       memset(term.trantbl, CS_USA, sizeof(term.trantbl));
+       term.charset = 0;

 
 

-       tclearregion(0, 0, term.col-1, term.row-1);
-       tmoveto(0, 0);
-       tcursor(CURSOR_SAVE);
+       for (i = 0; i < 2; i++) {
+               tmoveto(0, 0);
+               tcursor(CURSOR_SAVE);
+               tclearregion(0, 0, term.col-1, term.row-1);
+               tswapscreen();
+       }

 }
 
 void
 }
 
 void

-tnew(int col, int row) {
-       /* set screen size */
-       term.row = row;
-       term.col = col;
-       term.line = xmalloc(term.row * sizeof(Line));
-       term.alt  = xmalloc(term.row * sizeof(Line));
-       term.dirty = xmalloc(term.row * sizeof(*term.dirty));
-       term.tabs = xmalloc(term.col * sizeof(*term.tabs));
-
-       for(row = 0; row < term.row; row++) {
-               term.line[row] = xmalloc(term.col * sizeof(Glyph));
-               term.alt [row] = xmalloc(term.col * sizeof(Glyph));
-               term.dirty[row] = 0;
-       }
-       memset(term.tabs, 0, term.col * sizeof(*term.tabs));
-       /* setup screen */
+tnew(int col, int row)
+{
+       term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
+       tresize(col, row);

        treset();
 }
 
 void
        treset();
 }
 
 void

-tswapscreen(void) {
+tswapscreen(void)
+{

        Line *tmp = term.line;
 
        term.line = term.alt;
        Line *tmp = term.line;
 
        term.line = term.alt;


@@ -1116,74 +1062,71 @@ tswapscreen(void) {
 }
 
 void
 }
 
 void

-tscrolldown(int orig, int n) {
+tscrolldown(int orig, int n)
+{

        int i;
        Line temp;
 
        LIMIT(n, 0, term.bot-orig+1);
 
        int i;
        Line temp;
 
        LIMIT(n, 0, term.bot-orig+1);
 

+       tsetdirt(orig, term.bot-n);

        tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 
        tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 

-       for(i = term.bot; i >= orig+n; i--) {
+       for (i = term.bot; i >= orig+n; i--) {

                temp = term.line[i];
                term.line[i] = term.line[i-n];
                term.line[i-n] = temp;
                temp = term.line[i];
                term.line[i] = term.line[i-n];
                term.line[i-n] = temp;

-
-               term.dirty[i] = 1;
-               term.dirty[i-n] = 1;

        }
 
        selscroll(orig, n);
 }
 
 void
        }
 
        selscroll(orig, n);
 }
 
 void

-tscrollup(int orig, int n) {
+tscrollup(int orig, int n)
+{

        int i;
        Line temp;
        int i;
        Line temp;

+

        LIMIT(n, 0, term.bot-orig+1);
 
        tclearregion(0, orig, term.col-1, orig+n-1);
        LIMIT(n, 0, term.bot-orig+1);
 
        tclearregion(0, orig, term.col-1, orig+n-1);

+       tsetdirt(orig+n, term.bot);

 
 

-       for(i = orig; i <= term.bot-n; i++) {
-                temp = term.line[i];
-                term.line[i] = term.line[i+n];
-                term.line[i+n] = temp;
-
-                term.dirty[i] = 1;
-                term.dirty[i+n] = 1;
+       for (i = orig; i <= term.bot-n; i++) {
+               temp = term.line[i];
+               term.line[i] = term.line[i+n];
+               term.line[i+n] = temp;

        }
 
        selscroll(orig, -n);
 }
 
 void
        }
 
        selscroll(orig, -n);
 }
 
 void

-selscroll(int orig, int n) {
-       if(sel.bx == -1)
+selscroll(int orig, int n)
+{
+       if (sel.ob.x == -1)

                return;
 
                return;
 

-       if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
-               if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
-                       sel.bx = -1;
-                       return;
-               }
-               if(sel.by < term.top) {
-                       sel.by = term.top;
-                       sel.bx = 0;
-               }
-               if(sel.ey > term.bot) {
-                       sel.ey = term.bot;
-                       sel.ex = term.col;
+       if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot)) {
+               selclear();
+       } else if (BETWEEN(sel.nb.y, orig, term.bot)) {
+               sel.ob.y += n;
+               sel.oe.y += n;
+               if (sel.ob.y < term.top || sel.ob.y > term.bot ||
+                   sel.oe.y < term.top || sel.oe.y > term.bot) {
+                       selclear();
+               } else {
+                       selnormalize();

                }
                }

-               sel.b.y = sel.by, sel.b.x = sel.bx;
-               sel.e.y = sel.ey, sel.e.x = sel.ex;

        }
 }
 
 void
        }
 }
 
 void

-tnewline(int first_col) {
+tnewline(int first_col)
+{

        int y = term.c.y;
 
        int y = term.c.y;
 

-       if(y == term.bot) {
+       if (y == term.bot) {

                tscrollup(term.top, 1);
        } else {
                y++;
                tscrollup(term.top, 1);
        } else {
                y++;


@@ -1192,57 +1135,63 @@ tnewline(int first_col) {
 }
 
 void
 }
 
 void

-csiparse(void) {
-       /* int noarg = 1; */
-       char *p = csiescseq.buf;
+csiparse(void)
+{
+       char *p = csiescseq.buf, *np;
+       long int v;

 
        csiescseq.narg = 0;
 
        csiescseq.narg = 0;

-       if(*p == '?')
-               csiescseq.priv = 1, p++;
-
-       while(p < csiescseq.buf+csiescseq.len) {
-               while(isdigit(*p)) {
-                       csiescseq.arg[csiescseq.narg] *= 10;
-                       csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
-               }
-               if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ) {
-                       csiescseq.narg++, p++;
-               } else {
-                       csiescseq.mode = *p;
-                       csiescseq.narg++;
-
-                       return;
-               }
+       if (*p == '?') {
+               csiescseq.priv = 1;
+               p++;
+       }
+
+       csiescseq.buf[csiescseq.len] = '\0';
+       while (p < csiescseq.buf+csiescseq.len) {
+               np = NULL;
+               v = strtol(p, &np, 10);
+               if (np == p)
+                       v = 0;
+               if (v == LONG_MAX || v == LONG_MIN)
+                       v = -1;
+               csiescseq.arg[csiescseq.narg++] = v;
+               p = np;
+               if (*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
+                       break;
+               p++;

        }
        }

+       csiescseq.mode[0] = *p++;
+       csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';

 }
 
 /* for absolute user moves, when decom is set */
 void
 }
 
 /* for absolute user moves, when decom is set */
 void

-tmoveato(int x, int y) {
+tmoveato(int x, int y)
+{

        tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
 }
 
 void
        tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
 }
 
 void

-tmoveto(int x, int y) {
+tmoveto(int x, int y)
+{

        int miny, maxy;
 
        int miny, maxy;
 

-       if(term.c.state & CURSOR_ORIGIN) {
+       if (term.c.state & CURSOR_ORIGIN) {

                miny = term.top;
                maxy = term.bot;
        } else {
                miny = 0;
                maxy = term.row - 1;
        }
                miny = term.top;
                maxy = term.bot;
        } else {
                miny = 0;
                maxy = term.row - 1;
        }

-       LIMIT(x, 0, term.col-1);
-       LIMIT(y, miny, maxy);

        term.c.state &= ~CURSOR_WRAPNEXT;
        term.c.state &= ~CURSOR_WRAPNEXT;

-       term.c.x = x;
-       term.c.y = y;
+       term.c.x = LIMIT(x, 0, term.col-1);
+       term.c.y = LIMIT(y, miny, maxy);

 }
 
 void
 }
 
 void

-tsetchar(char *c, Glyph *attr, int x, int y) {
-       static char *vt100_0[62] = { /* 0x41 - 0x7e */
+tsetchar(Rune u, const Glyph *attr, int x, int y)
+{
+       static const char *vt100_0[62] = { /* 0x41 - 0x7e */

                "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
                0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
                0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
                "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
                0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
                0, 0, 0, 0, 0, 0, 0, 0, /* P - W */


@@ -1256,26 +1205,34 @@ tsetchar(char *c, Glyph *attr, int x, int y) {
        /*
         * The table is proudly stolen from rxvt.
         */
        /*
         * The table is proudly stolen from rxvt.
         */

-       if(attr->mode & ATTR_GFX) {
-               if(c[0] >= 0x41 && c[0] <= 0x7e
-                               && vt100_0[c[0] - 0x41]) {
-                       c = vt100_0[c[0] - 0x41];
+       if (term.trantbl[term.charset] == CS_GRAPHIC0 &&
+          BETWEEN(u, 0x41, 0x7e) && vt100_0[u - 0x41])
+               utf8decode(vt100_0[u - 0x41], &u, UTF_SIZ);
+
+       if (term.line[y][x].mode & ATTR_WIDE) {
+               if (x+1 < term.col) {
+                       term.line[y][x+1].u = ' ';
+                       term.line[y][x+1].mode &= ~ATTR_WDUMMY;

                }
                }

+       } else if (term.line[y][x].mode & ATTR_WDUMMY) {
+               term.line[y][x-1].u = ' ';
+               term.line[y][x-1].mode &= ~ATTR_WIDE;

        }
 
        term.dirty[y] = 1;
        term.line[y][x] = *attr;
        }
 
        term.dirty[y] = 1;
        term.line[y][x] = *attr;

-       memcpy(term.line[y][x].c, c, UTF_SIZ);
-       term.line[y][x].state |= GLYPH_SET;
+       term.line[y][x].u = u;

 }
 
 void
 }
 
 void

-tclearregion(int x1, int y1, int x2, int y2) {
+tclearregion(int x1, int y1, int x2, int y2)
+{

        int x, y, temp;
        int x, y, temp;

+       Glyph *gp;

 
 

-       if(x1 > x2)
+       if (x1 > x2)

                temp = x1, x1 = x2, x2 = temp;
                temp = x1, x1 = x2, x2 = temp;

-       if(y1 > y2)
+       if (y1 > y2)

                temp = y1, y1 = y2, y2 = temp;
 
        LIMIT(x1, 0, term.col-1);
                temp = y1, y1 = y2, y2 = temp;
 
        LIMIT(x1, 0, term.col-1);


@@ -1283,97 +1240,169 @@ tclearregion(int x1, int y1, int x2, int y2) {
        LIMIT(y1, 0, term.row-1);
        LIMIT(y2, 0, term.row-1);
 
        LIMIT(y1, 0, term.row-1);
        LIMIT(y2, 0, term.row-1);
 

-       for(y = y1; y <= y2; y++) {
+       for (y = y1; y <= y2; y++) {

                term.dirty[y] = 1;
                term.dirty[y] = 1;

-               for(x = x1; x <= x2; x++)
-                       term.line[y][x].state = 0;
+               for (x = x1; x <= x2; x++) {
+                       gp = &term.line[y][x];
+                       if (selected(x, y))
+                               selclear();
+                       gp->fg = term.c.attr.fg;
+                       gp->bg = term.c.attr.bg;
+                       gp->mode = 0;
+                       gp->u = ' ';
+               }

        }
 }
 
 void
        }
 }
 
 void

-tdeletechar(int n) {
-       int src = term.c.x + n;
-       int dst = term.c.x;
-       int size = term.col - src;
+tdeletechar(int n)
+{
+       int dst, src, size;
+       Glyph *line;

 
 

-       term.dirty[term.c.y] = 1;
+       LIMIT(n, 0, term.col - term.c.x);

 
 

-       if(src >= term.col) {
-               tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
-               return;
-       }
+       dst = term.c.x;
+       src = term.c.x + n;
+       size = term.col - src;
+       line = term.line[term.c.y];

 
 

-       memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
-                       size * sizeof(Glyph));
+       memmove(&line[dst], &line[src], size * sizeof(Glyph));

        tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 }
 
 void
        tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 }
 
 void

-tinsertblank(int n) {
-       int src = term.c.x;
-       int dst = src + n;
-       int size = term.col - dst;
+tinsertblank(int n)
+{
+       int dst, src, size;
+       Glyph *line;

 
 

-       term.dirty[term.c.y] = 1;
+       LIMIT(n, 0, term.col - term.c.x);

 
 

-       if(dst >= term.col) {
-               tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
-               return;
-       }
+       dst = term.c.x + n;
+       src = term.c.x;
+       size = term.col - dst;
+       line = term.line[term.c.y];

 
 

-       memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
-                       size * sizeof(Glyph));
+       memmove(&line[dst], &line[src], size * sizeof(Glyph));

        tclearregion(src, term.c.y, dst - 1, term.c.y);
 }
 
 void
        tclearregion(src, term.c.y, dst - 1, term.c.y);
 }
 
 void

-tinsertblankline(int n) {
-       if(term.c.y < term.top || term.c.y > term.bot)
-               return;
-
-       tscrolldown(term.c.y, n);
+tinsertblankline(int n)
+{
+       if (BETWEEN(term.c.y, term.top, term.bot))
+               tscrolldown(term.c.y, n);

 }
 
 void
 }
 
 void

-tdeleteline(int n) {
-       if(term.c.y < term.top || term.c.y > term.bot)
-               return;
+tdeleteline(int n)
+{
+       if (BETWEEN(term.c.y, term.top, term.bot))
+               tscrollup(term.c.y, n);
+}
+
+int32_t
+tdefcolor(const int *attr, int *npar, int l)
+{
+       int32_t idx = -1;
+       uint r, g, b;
+
+       switch (attr[*npar + 1]) {
+       case 2: /* direct color in RGB space */
+               if (*npar + 4 >= l) {
+                       fprintf(stderr,
+                               "erresc(38): Incorrect number of parameters (%d)\n",
+                               *npar);
+                       break;
+               }
+               r = attr[*npar + 2];
+               g = attr[*npar + 3];
+               b = attr[*npar + 4];
+               *npar += 4;
+               if (!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
+                       fprintf(stderr, "erresc: bad rgb color (%u,%u,%u)\n",
+                               r, g, b);
+               else
+                       idx = TRUECOLOR(r, g, b);
+               break;
+       case 5: /* indexed color */
+               if (*npar + 2 >= l) {
+                       fprintf(stderr,
+                               "erresc(38): Incorrect number of parameters (%d)\n",
+                               *npar);
+                       break;
+               }
+               *npar += 2;
+               if (!BETWEEN(attr[*npar], 0, 255))
+                       fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
+               else
+                       idx = attr[*npar];
+               break;
+       case 0: /* implemented defined (only foreground) */
+       case 1: /* transparent */
+       case 3: /* direct color in CMY space */
+       case 4: /* direct color in CMYK space */
+       default:
+               fprintf(stderr,
+                       "erresc(38): gfx attr %d unknown\n", attr[*npar]);
+               break;
+       }

 
 

-       tscrollup(term.c.y, n);
+       return idx;

 }
 
 void
 }
 
 void

-tsetattr(int *attr, int l) {
+tsetattr(const int *attr, int l)
+{

        int i;
        int i;

+       int32_t idx;

 
 

-       for(i = 0; i < l; i++) {
-               switch(attr[i]) {
+       for (i = 0; i < l; i++) {
+               switch (attr[i]) {

                case 0:
                case 0:

-                       term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD \
-                                       | ATTR_ITALIC | ATTR_BLINK);
+                       term.c.attr.mode &= ~(
+                               ATTR_BOLD       |
+                               ATTR_FAINT      |
+                               ATTR_ITALIC     |
+                               ATTR_UNDERLINE  |
+                               ATTR_BLINK      |
+                               ATTR_REVERSE    |
+                               ATTR_INVISIBLE  |
+                               ATTR_STRUCK     );

                        term.c.attr.fg = defaultfg;
                        term.c.attr.bg = defaultbg;
                        break;
                case 1:
                        term.c.attr.mode |= ATTR_BOLD;
                        break;
                        term.c.attr.fg = defaultfg;
                        term.c.attr.bg = defaultbg;
                        break;
                case 1:
                        term.c.attr.mode |= ATTR_BOLD;
                        break;

-               case 3: /* enter standout (highlight) */
+               case 2:
+                       term.c.attr.mode |= ATTR_FAINT;
+                       break;
+               case 3:

                        term.c.attr.mode |= ATTR_ITALIC;
                        break;
                case 4:
                        term.c.attr.mode |= ATTR_UNDERLINE;
                        break;
                        term.c.attr.mode |= ATTR_ITALIC;
                        break;
                case 4:
                        term.c.attr.mode |= ATTR_UNDERLINE;
                        break;

-               case 5:
+               case 5: /* slow blink */
+                       /* FALLTHROUGH */
+               case 6: /* rapid blink */

                        term.c.attr.mode |= ATTR_BLINK;
                        break;
                case 7:
                        term.c.attr.mode |= ATTR_REVERSE;
                        break;
                        term.c.attr.mode |= ATTR_BLINK;
                        break;
                case 7:
                        term.c.attr.mode |= ATTR_REVERSE;
                        break;

-               case 21:
+               case 8:
+                       term.c.attr.mode |= ATTR_INVISIBLE;
+                       break;
+               case 9:
+                       term.c.attr.mode |= ATTR_STRUCK;
+                       break;

                case 22:
                case 22:

-                       term.c.attr.mode &= ~ATTR_BOLD;
+                       term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);

                        break;
                        break;

-               case 23: /* leave standout (highlight) mode */
+               case 23:

                        term.c.attr.mode &= ~ATTR_ITALIC;
                        break;
                case 24:
                        term.c.attr.mode &= ~ATTR_ITALIC;
                        break;
                case 24:


@@ -1385,57 +1414,40 @@ tsetattr(int *attr, int l) {
                case 27:
                        term.c.attr.mode &= ~ATTR_REVERSE;
                        break;
                case 27:
                        term.c.attr.mode &= ~ATTR_REVERSE;
                        break;

+               case 28:
+                       term.c.attr.mode &= ~ATTR_INVISIBLE;
+                       break;
+               case 29:
+                       term.c.attr.mode &= ~ATTR_STRUCK;
+                       break;

                case 38:
                case 38:

-                       if(i + 2 < l && attr[i + 1] == 5) {
-                               i += 2;
-                               if(BETWEEN(attr[i], 0, 255)) {
-                                       term.c.attr.fg = attr[i];
-                               } else {
-                                       fprintf(stderr,
-                                               "erresc: bad fgcolor %d\n",
-                                               attr[i]);
-                               }
-                       } else {
-                               fprintf(stderr,
-                                       "erresc(38): gfx attr %d unknown\n",
-                                       attr[i]);
-                       }
+                       if ((idx = tdefcolor(attr, &i, l)) >= 0)
+                               term.c.attr.fg = idx;

                        break;
                case 39:
                        term.c.attr.fg = defaultfg;
                        break;
                case 48:
                        break;
                case 39:
                        term.c.attr.fg = defaultfg;
                        break;
                case 48:

-                       if(i + 2 < l && attr[i + 1] == 5) {
-                               i += 2;
-                               if(BETWEEN(attr[i], 0, 255)) {
-                                       term.c.attr.bg = attr[i];
-                               } else {
-                                       fprintf(stderr,
-                                               "erresc: bad bgcolor %d\n",
-                                               attr[i]);
-                               }
-                       } else {
-                               fprintf(stderr,
-                                       "erresc(48): gfx attr %d unknown\n",
-                                       attr[i]);
-                       }
+                       if ((idx = tdefcolor(attr, &i, l)) >= 0)
+                               term.c.attr.bg = idx;

                        break;
                case 49:
                        term.c.attr.bg = defaultbg;
                        break;
                default:
                        break;
                case 49:
                        term.c.attr.bg = defaultbg;
                        break;
                default:

-                       if(BETWEEN(attr[i], 30, 37)) {
+                       if (BETWEEN(attr[i], 30, 37)) {

                                term.c.attr.fg = attr[i] - 30;
                                term.c.attr.fg = attr[i] - 30;

-                       } else if(BETWEEN(attr[i], 40, 47)) {
+                       } else if (BETWEEN(attr[i], 40, 47)) {

                                term.c.attr.bg = attr[i] - 40;
                                term.c.attr.bg = attr[i] - 40;

-                       } else if(BETWEEN(attr[i], 90, 97)) {
+                       } else if (BETWEEN(attr[i], 90, 97)) {

                                term.c.attr.fg = attr[i] - 90 + 8;
                                term.c.attr.fg = attr[i] - 90 + 8;

-                       } else if(BETWEEN(attr[i], 100, 107)) {
+                       } else if (BETWEEN(attr[i], 100, 107)) {

                                term.c.attr.bg = attr[i] - 100 + 8;
                        } else {
                                fprintf(stderr,
                                        "erresc(default): gfx attr %d unknown\n",
                                term.c.attr.bg = attr[i] - 100 + 8;
                        } else {
                                fprintf(stderr,
                                        "erresc(default): gfx attr %d unknown\n",

-                                       attr[i]), csidump();
+                                       attr[i]);
+                               csidump();

                        }
                        break;
                }
                        }
                        break;
                }


@@ -1443,12 +1455,13 @@ tsetattr(int *attr, int l) {
 }
 
 void
 }
 
 void

-tsetscroll(int t, int b) {
+tsetscroll(int t, int b)
+{

        int temp;
 
        LIMIT(t, 0, term.row-1);
        LIMIT(b, 0, term.row-1);
        int temp;
 
        LIMIT(t, 0, term.row-1);
        LIMIT(b, 0, term.row-1);

-       if(t > b) {
+       if (t > b) {

                temp = t;
                t = b;
                b = temp;
                temp = t;
                t = b;
                b = temp;


@@ -1457,25 +1470,19 @@ tsetscroll(int t, int b) {
        term.bot = b;
 }
 
        term.bot = b;
 }
 

-#define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
-

 void
 void

-tsetmode(bool priv, bool set, int *args, int narg) {
-       int *lim, mode;
-       bool alt;
+tsetmode(int priv, int set, const int *args, int narg)
+{
+       int alt; const int *lim;

 
 

-       for(lim = args + narg; args < lim; ++args) {
-               if(priv) {
-                       switch(*args) {
-                               break;
+       for (lim = args + narg; args < lim; ++args) {
+               if (priv) {
+                       switch (*args) {

                        case 1: /* DECCKM -- Cursor key */
                        case 1: /* DECCKM -- Cursor key */

-                               MODBIT(term.mode, set, MODE_APPCURSOR);
+                               xsetmode(set, MODE_APPCURSOR);

                                break;
                        case 5: /* DECSCNM -- Reverse video */
                                break;
                        case 5: /* DECSCNM -- Reverse video */

-                               mode = term.mode;
-                               MODBIT(term.mode, set, MODE_REVERSE);
-                               if(mode != term.mode)
-                                       redraw();
+                               xsetmode(set, MODE_REVERSE);

                                break;
                        case 6: /* DECOM -- Origin */
                                MODBIT(term.c.state, set, CURSOR_ORIGIN);
                                break;
                        case 6: /* DECOM -- Origin */
                                MODBIT(term.c.state, set, CURSOR_ORIGIN);


@@ -1495,29 +1502,72 @@ tsetmode(bool priv, bool set, int *args, int narg) {
                        case 12: /* att610 -- Start blinking cursor (IGNORED) */
                                break;
                        case 25: /* DECTCEM -- Text Cursor Enable Mode */
                        case 12: /* att610 -- Start blinking cursor (IGNORED) */
                                break;
                        case 25: /* DECTCEM -- Text Cursor Enable Mode */

-                               MODBIT(term.mode, !set, MODE_HIDE);
+                               xsetmode(!set, MODE_HIDE);
+                               break;
+                       case 9:    /* X10 mouse compatibility mode */
+                               xsetpointermotion(0);
+                               xsetmode(0, MODE_MOUSE);
+                               xsetmode(set, MODE_MOUSEX10);
+                               break;
+                       case 1000: /* 1000: report button press */
+                               xsetpointermotion(0);
+                               xsetmode(0, MODE_MOUSE);
+                               xsetmode(set, MODE_MOUSEBTN);

                                break;
                                break;

-                       case 1000: /* 1000,1002: enable xterm mouse report */
-                               MODBIT(term.mode, set, MODE_MOUSEBTN);
+                       case 1002: /* 1002: report motion on button press */
+                               xsetpointermotion(0);
+                               xsetmode(0, MODE_MOUSE);
+                               xsetmode(set, MODE_MOUSEMOTION);

                                break;
                                break;

-                       case 1002:
-                               MODBIT(term.mode, set, MODE_MOUSEMOTION);
+                       case 1003: /* 1003: enable all mouse motions */
+                               xsetpointermotion(set);
+                               xsetmode(0, MODE_MOUSE);
+                               xsetmode(set, MODE_MOUSEMANY);

                                break;
                                break;

-                       case 1049: /* = 1047 and 1048 */
-                       case 47:
-                       case 1047: {
-                               alt = IS_SET(MODE_ALTSCREEN) != 0;
-                               if(alt)
-                                       tclearregion(0, 0, term.col-1, term.row-1);
-                               if(set ^ alt)           /* set is always 1 or 0 */
+                       case 1004: /* 1004: send focus events to tty */
+                               xsetmode(set, MODE_FOCUS);
+                               break;
+                       case 1006: /* 1006: extended reporting mode */
+                               xsetmode(set, MODE_MOUSESGR);
+                               break;
+                       case 1034:
+                               xsetmode(set, MODE_8BIT);
+                               break;
+                       case 1049: /* swap screen & set/restore cursor as xterm */
+                               if (!allowaltscreen)
+                                       break;
+                               tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
+                               /* FALLTHROUGH */
+                       case 47: /* swap screen */
+                       case 1047:
+                               if (!allowaltscreen)
+                                       break;
+                               alt = IS_SET(MODE_ALTSCREEN);
+                               if (alt) {
+                                       tclearregion(0, 0, term.col-1,
+                                                       term.row-1);
+                               }
+                               if (set ^ alt) /* set is always 1 or 0 */

                                        tswapscreen();
                                        tswapscreen();

-                               if(*args != 1049)
+                               if (*args != 1049)

                                        break;
                                        break;

-                       }
-                               /* pass through */
+                               /* FALLTHROUGH */

                        case 1048:
                                tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
                                break;
                        case 1048:
                                tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
                                break;

+                       case 2004: /* 2004: bracketed paste mode */
+                               xsetmode(set, MODE_BRCKTPASTE);
+                               break;
+                       /* Not implemented mouse modes. See comments there. */
+                       case 1001: /* mouse highlight mode; can hang the
+                                     terminal by design when implemented. */
+                       case 1005: /* UTF-8 mouse mode; will confuse
+                                     applications not supporting UTF-8
+                                     and luit. */
+                       case 1015: /* urxvt mangled mouse mode; incompatible
+                                     and can be mistaken for other control
+                                     codes. */
+                               break;

                        default:
                                fprintf(stderr,
                                        "erresc: unknown private set/reset mode %d\n",
                        default:
                                fprintf(stderr,
                                        "erresc: unknown private set/reset mode %d\n",


@@ -1525,11 +1575,11 @@ tsetmode(bool priv, bool set, int *args, int narg) {
                                break;
                        }
                } else {
                                break;
                        }
                } else {

-                       switch(*args) {
+                       switch (*args) {

                        case 0:  /* Error (IGNORED) */
                                break;
                        case 0:  /* Error (IGNORED) */
                                break;

-                       case 2:  /* KAM -- keyboard action */
-                               MODBIT(term.mode, set, MODE_KBDLOCK);
+                       case 2:
+                               xsetmode(set, MODE_KBDLOCK);

                                break;
                        case 4:  /* IRM -- Insertion-replacement */
                                MODBIT(term.mode, set, MODE_INSERT);
                                break;
                        case 4:  /* IRM -- Insertion-replacement */
                                MODBIT(term.mode, set, MODE_INSERT);


@@ -1549,12 +1599,14 @@ tsetmode(bool priv, bool set, int *args, int narg) {
                }
        }
 }
                }
        }
 }

-#undef MODBIT
-

 
 void
 
 void

-csihandle(void) {
-       switch(csiescseq.mode) {
+csihandle(void)
+{
+       char buf[40];
+       int len;
+
+       switch (csiescseq.mode[0]) {

        default:
        unknown:
                fprintf(stderr, "erresc: unknown csi ");
        default:
        unknown:
                fprintf(stderr, "erresc: unknown csi ");


@@ -1574,9 +1626,34 @@ csihandle(void) {
                DEFAULT(csiescseq.arg[0], 1);
                tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
                break;
                DEFAULT(csiescseq.arg[0], 1);
                tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
                break;

+       case 'i': /* MC -- Media Copy */
+               switch (csiescseq.arg[0]) {
+               case 0:
+                       tdump();
+                       break;
+               case 1:
+                       tdumpline(term.c.y);
+                       break;
+               case 2:
+                       tdumpsel();
+                       break;
+               case 4:
+                       term.mode &= ~MODE_PRINT;
+                       break;
+               case 5:
+                       term.mode |= MODE_PRINT;
+                       break;
+               }
+               break;

        case 'c': /* DA -- Device Attributes */
        case 'c': /* DA -- Device Attributes */

-               if(csiescseq.arg[0] == 0)
-                       ttywrite(VT102ID, sizeof(VT102ID) - 1);
+               if (csiescseq.arg[0] == 0)
+                       ttywrite(vtiden, strlen(vtiden), 0);
+               break;
+       case 'b': /* REP -- if last char is printable print it <n> more times */
+               DEFAULT(csiescseq.arg[0], 1);
+               if (term.lastc)
+                       while (csiescseq.arg[0]-- > 0)
+                               tputc(term.lastc);

                break;
        case 'C': /* CUF -- Cursor <n> Forward */
        case 'a': /* HPR -- Cursor <n> Forward */
                break;
        case 'C': /* CUF -- Cursor <n> Forward */
        case 'a': /* HPR -- Cursor <n> Forward */


@@ -1620,19 +1697,19 @@ csihandle(void) {
                break;
        case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
                DEFAULT(csiescseq.arg[0], 1);
                break;
        case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
                DEFAULT(csiescseq.arg[0], 1);

-               while(csiescseq.arg[0]--)
-                       tputtab(1);
+               tputtab(csiescseq.arg[0]);

                break;
        case 'J': /* ED -- Clear screen */
                break;
        case 'J': /* ED -- Clear screen */

-               sel.bx = -1;
-               switch(csiescseq.arg[0]) {
+               switch (csiescseq.arg[0]) {

                case 0: /* below */
                        tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
                case 0: /* below */
                        tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);

-                       if(term.c.y < term.row-1)
-                               tclearregion(0, term.c.y+1, term.col-1, term.row-1);
+                       if (term.c.y < term.row-1) {
+                               tclearregion(0, term.c.y+1, term.col-1,
+                                               term.row-1);
+                       }

                        break;
                case 1: /* above */
                        break;
                case 1: /* above */

-                       if(term.c.y > 1)
+                       if (term.c.y > 1)

                                tclearregion(0, 0, term.col-1, term.c.y-1);
                        tclearregion(0, term.c.y, term.c.x, term.c.y);
                        break;
                                tclearregion(0, 0, term.col-1, term.c.y-1);
                        tclearregion(0, term.c.y, term.c.x, term.c.y);
                        break;


@@ -1644,9 +1721,10 @@ csihandle(void) {
                }
                break;
        case 'K': /* EL -- Clear line */
                }
                break;
        case 'K': /* EL -- Clear line */

-               switch(csiescseq.arg[0]) {
+               switch (csiescseq.arg[0]) {

                case 0: /* right */
                case 0: /* right */

-                       tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
+                       tclearregion(term.c.x, term.c.y, term.col-1,
+                                       term.c.y);

                        break;
                case 1: /* left */
                        tclearregion(0, term.c.y, term.c.x, term.c.y);
                        break;
                case 1: /* left */
                        tclearregion(0, term.c.y, term.c.x, term.c.y);


@@ -1677,7 +1755,8 @@ csihandle(void) {
                break;
        case 'X': /* ECH -- Erase <n> char */
                DEFAULT(csiescseq.arg[0], 1);
                break;
        case 'X': /* ECH -- Erase <n> char */
                DEFAULT(csiescseq.arg[0], 1);

-               tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
+               tclearregion(term.c.x, term.c.y,
+                               term.c.x + csiescseq.arg[0] - 1, term.c.y);

                break;
        case 'P': /* DCH -- Delete <n> char */
                DEFAULT(csiescseq.arg[0], 1);
                break;
        case 'P': /* DCH -- Delete <n> char */
                DEFAULT(csiescseq.arg[0], 1);


@@ -1685,8 +1764,7 @@ csihandle(void) {
                break;
        case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
                DEFAULT(csiescseq.arg[0], 1);
                break;
        case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
                DEFAULT(csiescseq.arg[0], 1);

-               while(csiescseq.arg[0]--)
-                       tputtab(0);
+               tputtab(-csiescseq.arg[0]);

                break;
        case 'd': /* VPA -- Move to <row> */
                DEFAULT(csiescseq.arg[0], 1);
                break;
        case 'd': /* VPA -- Move to <row> */
                DEFAULT(csiescseq.arg[0], 1);


@@ -1698,8 +1776,15 @@ csihandle(void) {
        case 'm': /* SGR -- Terminal attribute (color) */
                tsetattr(csiescseq.arg, csiescseq.narg);
                break;
        case 'm': /* SGR -- Terminal attribute (color) */
                tsetattr(csiescseq.arg, csiescseq.narg);
                break;

+       case 'n': /* DSR – Device Status Report (cursor position) */
+               if (csiescseq.arg[0] == 6) {
+                       len = snprintf(buf, sizeof(buf), "\033[%i;%iR",
+                                       term.c.y+1, term.c.x+1);
+                       ttywrite(buf, len, 0);
+               }
+               break;

        case 'r': /* DECSTBM -- Set Scrolling Region */
        case 'r': /* DECSTBM -- Set Scrolling Region */

-               if(csiescseq.priv) {
+               if (csiescseq.priv) {

                        goto unknown;
                } else {
                        DEFAULT(csiescseq.arg[0], 1);
                        goto unknown;
                } else {
                        DEFAULT(csiescseq.arg[0], 1);


@@ -1714,1246 +1799,892 @@ csihandle(void) {
        case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
                tcursor(CURSOR_LOAD);
                break;
        case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
                tcursor(CURSOR_LOAD);
                break;

+       case ' ':
+               switch (csiescseq.mode[1]) {
+               case 'q': /* DECSCUSR -- Set Cursor Style */
+                       if (xsetcursor(csiescseq.arg[0]))
+                               goto unknown;
+                       break;
+               default:
+                       goto unknown;
+               }
+               break;

        }
 }
 
 void
        }
 }
 
 void

-csidump(void) {
-       int i;
+csidump(void)
+{
+       size_t i;

        uint c;
 
        uint c;
 

-       printf("ESC[");
-       for(i = 0; i < csiescseq.len; i++) {
+       fprintf(stderr, "ESC[");
+       for (i = 0; i < csiescseq.len; i++) {

                c = csiescseq.buf[i] & 0xff;
                c = csiescseq.buf[i] & 0xff;

-               if(isprint(c)) {
-                       putchar(c);
-               } else if(c == '\n') {
-                       printf("(\\n)");
-               } else if(c == '\r') {
-                       printf("(\\r)");
-               } else if(c == 0x1b) {
-                       printf("(\\e)");
+               if (isprint(c)) {
+                       putc(c, stderr);
+               } else if (c == '\n') {
+                       fprintf(stderr, "(\\n)");
+               } else if (c == '\r') {
+                       fprintf(stderr, "(\\r)");
+               } else if (c == 0x1b) {
+                       fprintf(stderr, "(\\e)");

                } else {
                } else {

-                       printf("(%02x)", c);
+                       fprintf(stderr, "(%02x)", c);

                }
        }
                }
        }

-       putchar('\n');
+       putc('\n', stderr);

 }
 
 void
 }
 
 void

-csireset(void) {
+csireset(void)
+{

        memset(&csiescseq, 0, sizeof(csiescseq));
 }
 
 void
        memset(&csiescseq, 0, sizeof(csiescseq));
 }
 
 void

-strhandle(void) {
-       char *p;
-
-       /*
-        * TODO: make this being useful in case of color palette change.
-        */
-       strparse();
-
-       p = strescseq.buf;
+osc4_color_response(int num)
+{
+       int n;
+       char buf[32];
+       unsigned char r, g, b;

 
 

-       switch(strescseq.type) {
-       case ']': /* OSC -- Operating System Command */
-               switch(p[0]) {
-               case '0':
-               case '1':
-               case '2':
-                       /*
-                        * TODO: Handle special chars in string, like umlauts.
-                        */
-                       if(p[1] == ';') {
-                               XStoreName(xw.dpy, xw.win, strescseq.buf+2);
-                       }
-                       break;
-               case ';':
-                       XStoreName(xw.dpy, xw.win, strescseq.buf+1);
-                       break;
-               case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
-                       break;
-               default:
-                       fprintf(stderr, "erresc: unknown str ");
-                       strdump();
-                       break;
-               }
-               break;
-       case 'k': /* old title set compatibility */
-               XStoreName(xw.dpy, xw.win, strescseq.buf);
-               break;
-       case 'P': /* DSC -- Device Control String */
-       case '_': /* APC -- Application Program Command */
-       case '^': /* PM -- Privacy Message */
-       default:
-               fprintf(stderr, "erresc: unknown str ");
-               strdump();
-               /* die(""); */
-               break;
+       if (xgetcolor(num, &r, &g, &b)) {
+               fprintf(stderr, "erresc: failed to fetch osc4 color %d\n", num);
+               return;

        }
        }

-}

 
 

-void
-strparse(void) {
-       /*
-        * TODO: Implement parsing like for CSI when required.
-        * Format: ESC type cmd ';' arg0 [';' argn] ESC \
-        */
-       return;
+       n = snprintf(buf, sizeof buf, "\033]4;%d;rgb:%02x%02x/%02x%02x/%02x%02x\007",
+                    num, r, r, g, g, b, b);
+
+       ttywrite(buf, n, 1);

 }
 
 void
 }
 
 void

-strdump(void) {
-       int i;
-       uint c;
+osc_color_response(int index, int num)
+{
+       int n;
+       char buf[32];
+       unsigned char r, g, b;

 
 

-       printf("ESC%c", strescseq.type);
-       for(i = 0; i < strescseq.len; i++) {
-               c = strescseq.buf[i] & 0xff;
-               if(isprint(c)) {
-                       putchar(c);
-               } else if(c == '\n') {
-                       printf("(\\n)");
-               } else if(c == '\r') {
-                       printf("(\\r)");
-               } else if(c == 0x1b) {
-                       printf("(\\e)");
-               } else {
-                       printf("(%02x)", c);
-               }
+       if (xgetcolor(index, &r, &g, &b)) {
+               fprintf(stderr, "erresc: failed to fetch osc color %d\n", index);
+               return;

        }
        }

-       printf("ESC\\\n");
-}

 
 

-void
-strreset(void) {
-       memset(&strescseq, 0, sizeof(strescseq));
+       n = snprintf(buf, sizeof buf, "\033]%d;rgb:%02x%02x/%02x%02x/%02x%02x\007",
+                    num, r, r, g, g, b, b);
+
+       ttywrite(buf, n, 1);

 }
 
 void
 }
 
 void

-tputtab(bool forward) {
-       uint x = term.c.x;
+strhandle(void)
+{
+       char *p = NULL, *dec;
+       int j, narg, par;
+
+       term.esc &= ~(ESC_STR_END|ESC_STR);
+       strparse();
+       par = (narg = strescseq.narg) ? atoi(strescseq.args[0]) : 0;

 
 

-       if(forward) {
-               if(x == term.col)
+       switch (strescseq.type) {
+       case ']': /* OSC -- Operating System Command */
+               switch (par) {
+               case 0:
+                       if (narg > 1) {
+                               xsettitle(strescseq.args[1]);
+                               xseticontitle(strescseq.args[1]);
+                       }

                        return;
                        return;

-               for(++x; x < term.col && !term.tabs[x]; ++x)
-                       /* nothing */ ;
-       } else {
-               if(x == 0)
+               case 1:
+                       if (narg > 1)
+                               xseticontitle(strescseq.args[1]);

                        return;
                        return;

-               for(--x; x > 0 && !term.tabs[x]; --x)
-                       /* nothing */ ;
-       }
-       tmoveto(x, term.c.y);
-}
-
-void
-techo(char *buf, int len) {
-       for(; len > 0; buf++, len--) {
-               char c = *buf;
-
-               if(c == '\033') {               /* escape */
-                       tputc("^", 1);
-                       tputc("[", 1);
-               } else if (c < '\x20') {        /* control code */
-                       if(c != '\n' && c != '\r' && c != '\t') {
-                               c |= '\x40';
-                               tputc("^", 1);
+               case 2:
+                       if (narg > 1)
+                               xsettitle(strescseq.args[1]);
+                       return;
+               case 52:
+                       if (narg > 2 && allowwindowops) {
+                               dec = base64dec(strescseq.args[2]);
+                               if (dec) {
+                                       xsetsel(dec);
+                                       xclipcopy();
+                               } else {
+                                       fprintf(stderr, "erresc: invalid base64\n");
+                               }

                        }
                        }

-                       tputc(&c, 1);
-               } else {
-                       break;
-               }
-       }
-       if (len)
-               tputc(buf, len);
-}
+                       return;
+               case 10:
+                       if (narg < 2)
+                               break;

 
 

-void
-tputc(char *c, int len) {
-       uchar ascii = *c;
-       bool control = ascii < '\x20' || ascii == 0177;
+                       p = strescseq.args[1];

 
 

-       if(iofd != -1) {
-               if (xwrite(iofd, c, len) < 0) {
-                       fprintf(stderr, "Error writting in %s:%s\n",
-                               opt_io, strerror(errno));
-                       close(iofd);
-                       iofd = -1;
-               }
-       }
-       /*
-        * STR sequences must be checked before anything else
-        * because it can use some control codes as part of the sequence.
-        */
-       if(term.esc & ESC_STR) {
-               switch(ascii) {
-               case '\033':
-                       term.esc = ESC_START | ESC_STR_END;
-                       break;
-               case '\a': /* backwards compatibility to xterm */
-                       term.esc = 0;
-                       strhandle();
-                       break;
-               default:
-                       strescseq.buf[strescseq.len++] = ascii;
-                       if(strescseq.len+1 >= STR_BUF_SIZ) {
-                               term.esc = 0;
-                               strhandle();
-                       }
-               }
-               return;
-       }
-
-       /*
-        * Actions of control codes must be performed as soon they arrive
-        * because they can be embedded inside a control sequence, and
-        * they must not cause conflicts with sequences.
-        */
-       if(control) {
-               switch(ascii) {
-               case '\t':      /* HT */
-                       tputtab(1);
-                       return;
-               case '\b':      /* BS */
-                       tmoveto(term.c.x-1, term.c.y);
-                       return;
-               case '\r':      /* CR */
-                       tmoveto(0, term.c.y);
-                       return;
-               case '\f':      /* LF */
-               case '\v':      /* VT */
-               case '\n':      /* LF */
-                       /* go to first col if the mode is set */
-                       tnewline(IS_SET(MODE_CRLF));
-                       return;
-               case '\a':      /* BEL */
-                       if(!(xw.state & WIN_FOCUSED))
-                               xseturgency(1);
-                       return;
-               case '\033':    /* ESC */
-                       csireset();
-                       term.esc = ESC_START;
+                       if (!strcmp(p, "?"))
+                               osc_color_response(defaultfg, 10);
+                       else if (xsetcolorname(defaultfg, p))
+                               fprintf(stderr, "erresc: invalid foreground color: %s\n", p);
+                       else
+                               tfulldirt();

                        return;
                        return;

-               case '\016':    /* SO */
-                       term.c.attr.mode |= ATTR_GFX;
-                       return;
-               case '\017':    /* SI */
-                       term.c.attr.mode &= ~ATTR_GFX;
-                       return;
-               case '\032':    /* SUB */
-               case '\030':    /* CAN */
-                       csireset();
-                       return;
-               case '\005':    /* ENQ (IGNORED) */
-               case '\000':    /* NUL (IGNORED) */
-               case '\021':    /* XON (IGNORED) */
-               case '\023':    /* XOFF (IGNORED) */
-               case 0177:      /* DEL (IGNORED) */
-                       return;
-               }
-       } else if(term.esc & ESC_START) {
-               if(term.esc & ESC_CSI) {
-                       csiescseq.buf[csiescseq.len++] = ascii;
-                       if(BETWEEN(ascii, 0x40, 0x7E)
-                                       || csiescseq.len >= ESC_BUF_SIZ) {
-                               term.esc = 0;
-                               csiparse(), csihandle();
-                       }
-               } else if(term.esc & ESC_STR_END) {
-                       term.esc = 0;
-                       if(ascii == '\\')
-                               strhandle();
-               } else if(term.esc & ESC_ALTCHARSET) {
-                       switch(ascii) {
-                       case '0': /* Line drawing set */
-                               term.c.attr.mode |= ATTR_GFX;
-                               break;
-                       case 'B': /* USASCII */
-                               term.c.attr.mode &= ~ATTR_GFX;
-                               break;
-                       case 'A': /* UK (IGNORED) */
-                       case '<': /* multinational charset (IGNORED) */
-                       case '5': /* Finnish (IGNORED) */
-                       case 'C': /* Finnish (IGNORED) */
-                       case 'K': /* German (IGNORED) */
-                               break;
-                       default:
-                               fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
-                       }
-                       term.esc = 0;
-               } else if(term.esc & ESC_TEST) {
-                       if(ascii == '8') { /* DEC screen alignment test. */
-                               char E[UTF_SIZ] = "E";
-                               int x, y;
-
-                               for(x = 0; x < term.col; ++x) {
-                                       for(y = 0; y < term.row; ++y)
-                                               tsetchar(E, &term.c.attr, x, y);
-                               }
-                       }
-                       term.esc = 0;
-               } else {
-                       switch(ascii) {
-                       case '[':
-                               term.esc |= ESC_CSI;
-                               break;
-                       case '#':
-                               term.esc |= ESC_TEST;
-                               break;
-                       case 'P': /* DCS -- Device Control String */
-                       case '_': /* APC -- Application Program Command */
-                       case '^': /* PM -- Privacy Message */
-                       case ']': /* OSC -- Operating System Command */
-                       case 'k': /* old title set compatibility */
-                               strreset();
-                               strescseq.type = ascii;
-                               term.esc |= ESC_STR;
-                               break;
-                       case '(': /* set primary charset G0 */
-                               term.esc |= ESC_ALTCHARSET;
-                               break;
-                       case ')': /* set secondary charset G1 (IGNORED) */
-                       case '*': /* set tertiary charset G2 (IGNORED) */
-                       case '+': /* set quaternary charset G3 (IGNORED) */
-                               term.esc = 0;
-                               break;
-                       case 'D': /* IND -- Linefeed */
-                               if(term.c.y == term.bot) {
-                                       tscrollup(term.top, 1);
-                               } else {
-                                       tmoveto(term.c.x, term.c.y+1);
-                               }
-                               term.esc = 0;
-                               break;
-                       case 'E': /* NEL -- Next line */
-                               tnewline(1); /* always go to first col */
-                               term.esc = 0;
-                               break;
-                       case 'H': /* HTS -- Horizontal tab stop */
-                               term.tabs[term.c.x] = 1;
-                               term.esc = 0;
-                               break;
-                       case 'M': /* RI -- Reverse index */
-                               if(term.c.y == term.top) {
-                                       tscrolldown(term.top, 1);
-                               } else {
-                                       tmoveto(term.c.x, term.c.y-1);
-                               }
-                               term.esc = 0;
-                               break;
-                       case 'Z': /* DECID -- Identify Terminal */
-                               ttywrite(VT102ID, sizeof(VT102ID) - 1);
-                               term.esc = 0;
-                               break;
-                       case 'c': /* RIS -- Reset to inital state */
-                               treset();
-                               term.esc = 0;
-                               xresettitle();
+               case 11:
+                       if (narg < 2)

                                break;
                                break;

-                       case '=': /* DECPAM -- Application keypad */
-                               term.mode |= MODE_APPKEYPAD;
-                               term.esc = 0;
-                               break;
-                       case '>': /* DECPNM -- Normal keypad */
-                               term.mode &= ~MODE_APPKEYPAD;
-                               term.esc = 0;
-                               break;
-                       case '7': /* DECSC -- Save Cursor */
-                               tcursor(CURSOR_SAVE);
-                               term.esc = 0;
-                               break;
-                       case '8': /* DECRC -- Restore Cursor */
-                               tcursor(CURSOR_LOAD);
-                               term.esc = 0;
+
+                       p = strescseq.args[1];
+
+                       if (!strcmp(p, "?"))
+                               osc_color_response(defaultbg, 11);
+                       else if (xsetcolorname(defaultbg, p))
+                               fprintf(stderr, "erresc: invalid background color: %s\n", p);
+                       else
+                               tfulldirt();
+                       return;
+               case 12:
+                       if (narg < 2)

                                break;
                                break;

-                       case '\\': /* ST -- Stop */
-                               term.esc = 0;
+
+                       p = strescseq.args[1];
+
+                       if (!strcmp(p, "?"))
+                               osc_color_response(defaultcs, 12);
+                       else if (xsetcolorname(defaultcs, p))
+                               fprintf(stderr, "erresc: invalid cursor color: %s\n", p);
+                       else
+                               tfulldirt();
+                       return;
+               case 4: /* color set */
+                       if (narg < 3)

                                break;
                                break;

-                       default:
-                               fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
-                                       (uchar) ascii, isprint(ascii)? ascii:'.');
-                               term.esc = 0;
+                       p = strescseq.args[2];
+                       /* FALLTHROUGH */
+               case 104: /* color reset */
+                       j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
+
+                       if (p && !strcmp(p, "?"))
+                               osc4_color_response(j);
+                       else if (xsetcolorname(j, p)) {
+                               if (par == 104 && narg <= 1)
+                                       return; /* color reset without parameter */
+                               fprintf(stderr, "erresc: invalid color j=%d, p=%s\n",
+                                       j, p ? p : "(null)");
+                       } else {
+                               /*
+                                * TODO if defaultbg color is changed, borders
+                                * are dirty
+                                */
+                               tfulldirt();

                        }
                        }

+                       return;

                }
                }

-               /*
-                * All characters which form part of a sequence are not
-                * printed
-                */
+               break;
+       case 'k': /* old title set compatibility */
+               xsettitle(strescseq.args[0]);

                return;
                return;

-       }
-       /*
-        * Display control codes only if we are in graphic mode
-        */
-       if(control && !(term.c.attr.mode & ATTR_GFX))
+       case 'P': /* DCS -- Device Control String */
+       case '_': /* APC -- Application Program Command */
+       case '^': /* PM -- Privacy Message */

                return;
                return;

-       if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
-               sel.bx = -1;
-       if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
-               tnewline(1); /* always go to first col */
-
-       if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
-               memmove(&term.line[term.c.y][term.c.x+1],
-                       &term.line[term.c.y][term.c.x],
-                       (term.col - term.c.x - 1) * sizeof(Glyph));

        }
 
        }
 

-       tsetchar(c, &term.c.attr, term.c.x, term.c.y);
-       if(term.c.x+1 < term.col) {
-               tmoveto(term.c.x+1, term.c.y);
-       } else {
-               term.c.state |= CURSOR_WRAPNEXT;
-       }
+       fprintf(stderr, "erresc: unknown str ");
+       strdump();

 }
 
 }
 

-int
-tresize(int col, int row) {
-       int i, x;
-       int minrow = MIN(row, term.row);
-       int mincol = MIN(col, term.col);
-       int slide = term.c.y - row + 1;
-       bool *bp;
-
-       if(col < 1 || row < 1)
-               return 0;
-
-       /* free unneeded rows */
-       i = 0;
-       if(slide > 0) {
-               /* slide screen to keep cursor where we expect it -
-                * tscrollup would work here, but we can optimize to
-                * memmove because we're freeing the earlier lines */
-               for(/* i = 0 */; i < slide; i++) {
-                       free(term.line[i]);
-                       free(term.alt[i]);
-               }
-               memmove(term.line, term.line + slide, row * sizeof(Line));
-               memmove(term.alt, term.alt + slide, row * sizeof(Line));
-       }
-       for(i += row; i < term.row; i++) {
-               free(term.line[i]);
-               free(term.alt[i]);
-       }
-
-       /* resize to new height */
-       term.line = xrealloc(term.line, row * sizeof(Line));
-       term.alt  = xrealloc(term.alt,  row * sizeof(Line));
-       term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
-       term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
+void
+strparse(void)
+{
+       int c;
+       char *p = strescseq.buf;

 
 

-       /* resize each row to new width, zero-pad if needed */
-       for(i = 0; i < minrow; i++) {
-               term.dirty[i] = 1;
-               term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
-               term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
-               for(x = mincol; x < col; x++) {
-                       term.line[i][x].state = 0;
-                       term.alt[i][x].state = 0;
-               }
-       }
+       strescseq.narg = 0;
+       strescseq.buf[strescseq.len] = '\0';

 
 

-       /* allocate any new rows */
-       for(/* i == minrow */; i < row; i++) {
-               term.dirty[i] = 1;
-               term.line[i] = xcalloc(col, sizeof(Glyph));
-               term.alt [i] = xcalloc(col, sizeof(Glyph));
-       }
-       if(col > term.col) {
-               bp = term.tabs + term.col;
+       if (*p == '\0')
+               return;

 
 

-               memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
-               while(--bp > term.tabs && !*bp)
-                       /* nothing */ ;
-               for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
-                       *bp = 1;
+       while (strescseq.narg < STR_ARG_SIZ) {
+               strescseq.args[strescseq.narg++] = p;
+               while ((c = *p) != ';' && c != '\0')
+                       ++p;
+               if (c == '\0')
+                       return;
+               *p++ = '\0';

        }
        }

-       /* update terminal size */
-       term.col = col;
-       term.row = row;
-       /* reset scrolling region */
-       tsetscroll(0, row-1);
-       /* make use of the LIMIT in tmoveto */
-       tmoveto(term.c.x, term.c.y);
-
-       return (slide > 0);
-}
-
-void
-xresize(int col, int row) {
-       xw.tw = MAX(1, 2*borderpx + col * xw.cw);
-       xw.th = MAX(1, 2*borderpx + row * xw.ch);
-
-       XftDrawChange(xw.draw, xw.buf);

 }
 
 void
 }
 
 void

-xloadcols(void) {
-       int i, r, g, b;
-       XRenderColor color = { .alpha = 0 };
-
-       /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
-       for(i = 0; i < LEN(colorname); i++) {
-               if(!colorname[i])
-                       continue;
-               if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
-                       die("Could not allocate color '%s'\n", colorname[i]);
-               }
-       }
-
-       /* load colors [16-255] ; same colors as xterm */
-       for(i = 16, r = 0; r < 6; r++) {
-               for(g = 0; g < 6; g++) {
-                       for(b = 0; b < 6; b++) {
-                               color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
-                               color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
-                               color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
-                               if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
-                                       die("Could not allocate color %d\n", i);
-                               }
-                               i++;
-                       }
-               }
-       }
+strdump(void)
+{
+       size_t i;
+       uint c;

 
 

-       for(r = 0; r < 24; r++, i++) {
-               color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
-               if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
-                                       &dc.col[i])) {
-                       die("Could not allocate color %d\n", i);
+       fprintf(stderr, "ESC%c", strescseq.type);
+       for (i = 0; i < strescseq.len; i++) {
+               c = strescseq.buf[i] & 0xff;
+               if (c == '\0') {
+                       putc('\n', stderr);
+                       return;
+               } else if (isprint(c)) {
+                       putc(c, stderr);
+               } else if (c == '\n') {
+                       fprintf(stderr, "(\\n)");
+               } else if (c == '\r') {
+                       fprintf(stderr, "(\\r)");
+               } else if (c == 0x1b) {
+                       fprintf(stderr, "(\\e)");
+               } else {
+                       fprintf(stderr, "(%02x)", c);

                }
        }
                }
        }

+       fprintf(stderr, "ESC\\\n");

 }
 
 void
 }
 
 void

-xtermclear(int col1, int row1, int col2, int row2) {
-       XftDrawRect(xw.draw,
-                       &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
-                       borderpx + col1 * xw.cw,
-                       borderpx + row1 * xw.ch,
-                       (col2-col1+1) * xw.cw,
-                       (row2-row1+1) * xw.ch);
+strreset(void)
+{
+       strescseq = (STREscape){
+               .buf = xrealloc(strescseq.buf, STR_BUF_SIZ),
+               .siz = STR_BUF_SIZ,
+       };

 }
 
 }
 

-/*
- * Absolute coordinates.
- */

 void
 void

-xclear(int x1, int y1, int x2, int y2) {
-       XftDrawRect(xw.draw,
-                       &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
-                       x1, y1, x2-x1, y2-y1);
+sendbreak(const Arg *arg)
+{
+       if (tcsendbreak(cmdfd, 0))
+               perror("Error sending break");

 }
 
 void
 }
 
 void

-xhints(void) {
-       XClassHint class = {opt_class ? opt_class : termname, termname};
-       XWMHints wm = {.flags = InputHint, .input = 1};
-       XSizeHints *sizeh = NULL;
-
-       sizeh = XAllocSizeHints();
-       if(xw.isfixed == False) {
-               sizeh->flags = PSize | PResizeInc | PBaseSize;
-               sizeh->height = xw.h;
-               sizeh->width = xw.w;
-               sizeh->height_inc = xw.ch;
-               sizeh->width_inc = xw.cw;
-               sizeh->base_height = 2*borderpx;
-               sizeh->base_width = 2*borderpx;
-       } else {
-               sizeh->flags = PMaxSize | PMinSize;
-               sizeh->min_width = sizeh->max_width = xw.fw;
-               sizeh->min_height = sizeh->max_height = xw.fh;
+tprinter(char *s, size_t len)
+{
+       if (iofd != -1 && xwrite(iofd, s, len) < 0) {
+               perror("Error writing to output file");
+               close(iofd);
+               iofd = -1;

        }
        }

-
-       XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
-       XFree(sizeh);

 }
 
 }
 

-int
-xloadfont(Font *f, FcPattern *pattern) {
-       FcPattern *match;
-       FcResult result;
-
-       match = XftFontMatch(xw.dpy, xw.scr, pattern, &result);
-       if(!match)
-               return 1;
-       if(!(f->set = XftFontOpenPattern(xw.dpy, match))) {
-               FcPatternDestroy(match);
-               return 1;
-       }
-
-       f->ascent = f->set->ascent;
-       f->descent = f->set->descent;
-       f->lbearing = 0;
-       f->rbearing = f->set->max_advance_width;
-
-       f->height = f->set->height;
-       f->width = f->lbearing + f->rbearing;
-
-       return 0;
+void
+toggleprinter(const Arg *arg)
+{
+       term.mode ^= MODE_PRINT;

 }
 
 void
 }
 
 void

-xloadfonts(char *fontstr, int fontsize) {
-       FcPattern *pattern;
-       FcResult result;
-       double fontval;
-
-       if(fontstr[0] == '-') {
-               pattern = XftXlfdParse(fontstr, False, False);
-       } else {
-               pattern = FcNameParse((FcChar8 *)fontstr);
-       }
-
-       if(!pattern)
-               die("st: can't open font %s\n", fontstr);
-
-       if(fontsize > 0) {
-               FcPatternDel(pattern, FC_PIXEL_SIZE);
-               FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
-               usedfontsize = fontsize;
-       } else {
-               result = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
-               if(result == FcResultMatch) {
-                       usedfontsize = (int)fontval;
-               } else {
-                       /*
-                        * Default font size is 12, if none given. This is to
-                        * have a known usedfontsize value.
-                        */
-                       FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
-                       usedfontsize = 12;
-               }
-       }
-
-       if(xloadfont(&dc.font, pattern))
-               die("st: can't open font %s\n", fontstr);
-
-       /* Setting character width and height. */
-       xw.cw = dc.font.width;
-       xw.ch = dc.font.height;
-
-       FcPatternDel(pattern, FC_WEIGHT);
-       FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
-       if(xloadfont(&dc.bfont, pattern))
-               die("st: can't open font %s\n", fontstr);
-
-       FcPatternDel(pattern, FC_SLANT);
-       FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
-       if(xloadfont(&dc.ibfont, pattern))
-               die("st: can't open font %s\n", fontstr);
-
-       FcPatternDel(pattern, FC_WEIGHT);
-       if(xloadfont(&dc.ifont, pattern))
-               die("st: can't open font %s\n", fontstr);
-
-       FcPatternDestroy(pattern);
+printscreen(const Arg *arg)
+{
+       tdump();

 }
 
 void
 }
 
 void

-xzoom(const Arg *arg)
+printsel(const Arg *arg)

 {
 {

-       xloadfonts(usedfont, usedfontsize + arg->i);
-       cresize(0, 0);
-       draw();
+       tdumpsel();

 }
 
 void
 }
 
 void

-xinit(void) {
-       XSetWindowAttributes attrs;
-       Cursor cursor;
-       Window parent;
-       int sw, sh, major, minor;
-
-       if(!(xw.dpy = XOpenDisplay(NULL)))
-               die("Can't open display\n");
-       xw.scr = XDefaultScreen(xw.dpy);
-       xw.vis = XDefaultVisual(xw.dpy, xw.scr);
-
-       /* font */
-       usedfont = (opt_font == NULL)? font : opt_font;
-       xloadfonts(usedfont, 0);
-
-       /* colors */
-       xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
-       xloadcols();
-
-       /* adjust fixed window geometry */
-       if(xw.isfixed) {
-               sw = DisplayWidth(xw.dpy, xw.scr);
-               sh = DisplayHeight(xw.dpy, xw.scr);
-               if(xw.fx < 0)
-                       xw.fx = sw + xw.fx - xw.fw - 1;
-               if(xw.fy < 0)
-                       xw.fy = sh + xw.fy - xw.fh - 1;
-
-               xw.h = xw.fh;
-               xw.w = xw.fw;
-       } else {
-               /* window - default size */
-               xw.h = 2*borderpx + term.row * xw.ch;
-               xw.w = 2*borderpx + term.col * xw.cw;
-               xw.fx = 0;
-               xw.fy = 0;
-       }
-
-       attrs.background_pixel = dc.col[defaultbg].pixel;
-       attrs.border_pixel = dc.col[defaultbg].pixel;
-       attrs.bit_gravity = NorthWestGravity;
-       attrs.event_mask = FocusChangeMask | KeyPressMask
-               | ExposureMask | VisibilityChangeMask | StructureNotifyMask
-               | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
-       attrs.colormap = xw.cmap;
-
-       parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
-       xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
-                       xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
-                       xw.vis,
-                       CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
-                       | CWColormap,
-                       &attrs);
-
-       /* double buffering */
-       if(!XdbeQueryExtension(xw.dpy, &major, &minor))
-               die("Xdbe extension is not present\n");
-       xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
-
-       /* Xft rendering context */
-       xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
-
-       /* input methods */
-       xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
-       xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
-                                          | XIMStatusNothing, XNClientWindow, xw.win,
-                                          XNFocusWindow, xw.win, NULL);
-
-       /* white cursor, black outline */
-       cursor = XCreateFontCursor(xw.dpy, XC_xterm);
-       XDefineCursor(xw.dpy, xw.win, cursor);
-       XRecolorCursor(xw.dpy, cursor,
-               &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
-               &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
-
-       xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
-       xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
-       XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
-
-       xresettitle();
-       XMapWindow(xw.dpy, xw.win);
-       xhints();
-       XSync(xw.dpy, 0);
-}
-
-void
-xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
-       int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
-           width = charlen * xw.cw;
-       Font *font = &dc.font;
-       XGlyphInfo extents;
-       Colour *fg = &dc.col[base.fg], *bg = &dc.col[base.bg],
-                *temp, revfg, revbg;
-       XRenderColor colfg, colbg;
-
-       if(base.mode & ATTR_BOLD) {
-               if(BETWEEN(base.fg, 0, 7)) {
-                       /* basic system colors */
-                       fg = &dc.col[base.fg + 8];
-               } else if(BETWEEN(base.fg, 16, 195)) {
-                       /* 256 colors */
-                       fg = &dc.col[base.fg + 36];
-               } else if(BETWEEN(base.fg, 232, 251)) {
-                       /* greyscale */
-                       fg = &dc.col[base.fg + 4];
-               }
-               /*
-                * Those ranges will not be brightened:
-                *      8 - 15 – bright system colors
-                *      196 - 231 – highest 256 color cube
-                *      252 - 255 – brightest colors in greyscale
-                */
-               font = &dc.bfont;
-       }
-
-       if(base.mode & ATTR_ITALIC)
-               font = &dc.ifont;
-       if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD))
-               font = &dc.ibfont;
-
-       if(IS_SET(MODE_REVERSE)) {
-               if(fg == &dc.col[defaultfg]) {
-                       fg = &dc.col[defaultbg];
-               } else {
-                       colfg.red = ~fg->color.red;
-                       colfg.green = ~fg->color.green;
-                       colfg.blue = ~fg->color.blue;
-                       colfg.alpha = fg->color.alpha;
-                       XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
-                       fg = &revfg;
-               }
-
-               if(bg == &dc.col[defaultbg]) {
-                       bg = &dc.col[defaultfg];
-               } else {
-                       colbg.red = ~bg->color.red;
-                       colbg.green = ~bg->color.green;
-                       colbg.blue = ~bg->color.blue;
-                       colbg.alpha = bg->color.alpha;
-                       XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &revbg);
-                       bg = &revbg;
-               }
-       }
-
-       if(base.mode & ATTR_REVERSE)
-               temp = fg, fg = bg, bg = temp;
-
-       XftTextExtentsUtf8(xw.dpy, font->set, (FcChar8 *)s, bytelen,
-                       &extents);
-       width = extents.xOff;
-
-       /* Intelligent cleaning up of the borders. */
-       if(x == 0) {
-               xclear(0, (y == 0)? 0 : winy, borderpx,
-                       winy + xw.ch + (y == term.row-1)? xw.h : 0);
-       }
-       if(x + charlen >= term.col-1) {
-               xclear(winx + width, (y == 0)? 0 : winy, xw.w,
-                       (y == term.row-1)? xw.h : (winy + xw.ch));
-       }
-       if(y == 0)
-               xclear(winx, 0, winx + width, borderpx);
-       if(y == term.row-1)
-               xclear(winx, winy + xw.ch, winx + width, xw.h);
-
-       XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
-       XftDrawStringUtf8(xw.draw, fg, font->set, winx,
-                       winy + font->ascent, (FcChar8 *)s, bytelen);
+tdumpsel(void)
+{
+       char *ptr;

 
 

-       if(base.mode & ATTR_UNDERLINE) {
-               XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
-                               width, 1);
+       if ((ptr = getsel())) {
+               tprinter(ptr, strlen(ptr));
+               free(ptr);

        }
 }
 
 void
        }
 }
 
 void

-xdrawcursor(void) {
-       static int oldx = 0, oldy = 0;
-       int sl;
-       Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs, 0};
-
-       LIMIT(oldx, 0, term.col-1);
-       LIMIT(oldy, 0, term.row-1);
-
-       if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
-               memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
-
-       /* remove the old cursor */
-       if(term.line[oldy][oldx].state & GLYPH_SET) {
-               sl = utf8size(term.line[oldy][oldx].c);
-               xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
-                               oldy, 1, sl);
-       } else {
-               xtermclear(oldx, oldy, oldx, oldy);
-       }
-
-       /* draw the new one */
-       if(!(IS_SET(MODE_HIDE))) {
-               if(!(xw.state & WIN_FOCUSED))
-                       g.bg = defaultucs;
-
-               if(IS_SET(MODE_REVERSE))
-                       g.mode |= ATTR_REVERSE, g.fg = defaultcs, g.bg = defaultfg;
+tdumpline(int n)
+{
+       char buf[UTF_SIZ];
+       const Glyph *bp, *end;

 
 

-               sl = utf8size(g.c);
-               xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
-               oldx = term.c.x, oldy = term.c.y;
+       bp = &term.line[n][0];
+       end = &bp[MIN(tlinelen(n), term.col) - 1];
+       if (bp != end || bp->u != ' ') {
+               for ( ; bp <= end; ++bp)
+                       tprinter(buf, utf8encode(bp->u, buf));

        }
        }

+       tprinter("\n", 1);

 }
 
 void
 }
 
 void

-xresettitle(void) {
-       XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
+tdump(void)
+{
+       int i;
+
+       for (i = 0; i < term.row; ++i)
+               tdumpline(i);

 }
 
 void
 }
 
 void

-redraw(void) {
-       struct timespec tv = {0, REDRAW_TIMEOUT * 1000};
+tputtab(int n)
+{
+       uint x = term.c.x;

 
 

-       tfulldirt();
-       draw();
-       XSync(xw.dpy, False); /* necessary for a good tput flash */
-       nanosleep(&tv, NULL);
+       if (n > 0) {
+               while (x < term.col && n--)
+                       for (++x; x < term.col && !term.tabs[x]; ++x)
+                               /* nothing */ ;
+       } else if (n < 0) {
+               while (x > 0 && n++)
+                       for (--x; x > 0 && !term.tabs[x]; --x)
+                               /* nothing */ ;
+       }
+       term.c.x = LIMIT(x, 0, term.col-1);

 }
 
 void
 }
 
 void

-draw(void) {
-       XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
-
-       drawregion(0, 0, term.col, term.row);
-       XdbeSwapBuffers(xw.dpy, swpinfo, 1);
+tdefutf8(char ascii)
+{
+       if (ascii == 'G')
+               term.mode |= MODE_UTF8;
+       else if (ascii == '@')
+               term.mode &= ~MODE_UTF8;

 }
 
 void
 }
 
 void

-drawregion(int x1, int y1, int x2, int y2) {
-       int ic, ib, x, y, ox, sl;
-       Glyph base, new;
-       char buf[DRAW_BUF_SIZ];
-       bool ena_sel = sel.bx != -1, alt = IS_SET(MODE_ALTSCREEN) != 0;
-
-       if((sel.alt != 0) ^ alt)
-               ena_sel = 0;
-       if(!(xw.state & WIN_VISIBLE))
-               return;
-
-       for(y = y1; y < y2; y++) {
-               if(!term.dirty[y])
-                       continue;
+tdeftran(char ascii)
+{
+       static char cs[] = "0B";
+       static int vcs[] = {CS_GRAPHIC0, CS_USA};
+       char *p;

 
 

-               xtermclear(0, y, term.col, y);
-               term.dirty[y] = 0;
-               base = term.line[y][0];
-               ic = ib = ox = 0;
-               for(x = x1; x < x2; x++) {
-                       new = term.line[y][x];
-                       if(ena_sel && *(new.c) && selected(x, y))
-                               new.mode ^= ATTR_REVERSE;
-                       if(ib > 0 && (!(new.state & GLYPH_SET)
-                                       || ATTRCMP(base, new)
-                                       || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
-                               xdraws(buf, base, ox, y, ic, ib);
-                               ic = ib = 0;
-                       }
-                       if(new.state & GLYPH_SET) {
-                               if(ib == 0) {
-                                       ox = x;
-                                       base = new;
-                               }
-                               sl = utf8size(new.c);
-                               memcpy(buf+ib, new.c, sl);
-                               ib += sl;
-                               ++ic;
-                       }
-               }
-               if(ib > 0)
-                       xdraws(buf, base, ox, y, ic, ib);
+       if ((p = strchr(cs, ascii)) == NULL) {
+               fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
+       } else {
+               term.trantbl[term.icharset] = vcs[p - cs];

        }
        }

-       xdrawcursor();

 }
 
 void
 }
 
 void

-expose(XEvent *ev) {
-       XExposeEvent *e = &ev->xexpose;
+tdectest(char c)
+{
+       int x, y;

 
 

-       if(xw.state & WIN_REDRAW) {
-               if(!e->count)
-                       xw.state &= ~WIN_REDRAW;
+       if (c == '8') { /* DEC screen alignment test. */
+               for (x = 0; x < term.col; ++x) {
+                       for (y = 0; y < term.row; ++y)
+                               tsetchar('E', &term.c.attr, x, y);
+               }

        }
 }
 
 void
        }
 }
 
 void

-visibility(XEvent *ev) {
-       XVisibilityEvent *e = &ev->xvisibility;
-
-       if(e->state == VisibilityFullyObscured) {
-               xw.state &= ~WIN_VISIBLE;
-       } else if(!(xw.state & WIN_VISIBLE)) {
-               /* need a full redraw for next Expose, not just a buf copy */
-               xw.state |= WIN_VISIBLE | WIN_REDRAW;
+tstrsequence(uchar c)
+{
+       switch (c) {
+       case 0x90:   /* DCS -- Device Control String */
+               c = 'P';
+               break;
+       case 0x9f:   /* APC -- Application Program Command */
+               c = '_';
+               break;
+       case 0x9e:   /* PM -- Privacy Message */
+               c = '^';
+               break;
+       case 0x9d:   /* OSC -- Operating System Command */
+               c = ']';
+               break;

        }
        }

+       strreset();
+       strescseq.type = c;
+       term.esc |= ESC_STR;

 }
 
 void
 }
 
 void

-unmap(XEvent *ev) {
-       xw.state &= ~WIN_VISIBLE;
+tcontrolcode(uchar ascii)
+{
+       switch (ascii) {
+       case '\t':   /* HT */
+               tputtab(1);
+               return;
+       case '\b':   /* BS */
+               tmoveto(term.c.x-1, term.c.y);
+               return;
+       case '\r':   /* CR */
+               tmoveto(0, term.c.y);
+               return;
+       case '\f':   /* LF */
+       case '\v':   /* VT */
+       case '\n':   /* LF */
+               /* go to first col if the mode is set */
+               tnewline(IS_SET(MODE_CRLF));
+               return;
+       case '\a':   /* BEL */
+               if (term.esc & ESC_STR_END) {
+                       /* backwards compatibility to xterm */
+                       strhandle();
+               } else {
+                       xbell();
+               }
+               break;
+       case '\033': /* ESC */
+               csireset();
+               term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
+               term.esc |= ESC_START;
+               return;
+       case '\016': /* SO (LS1 -- Locking shift 1) */
+       case '\017': /* SI (LS0 -- Locking shift 0) */
+               term.charset = 1 - (ascii - '\016');
+               return;
+       case '\032': /* SUB */
+               tsetchar('?', &term.c.attr, term.c.x, term.c.y);
+               /* FALLTHROUGH */
+       case '\030': /* CAN */
+               csireset();
+               break;
+       case '\005': /* ENQ (IGNORED) */
+       case '\000': /* NUL (IGNORED) */
+       case '\021': /* XON (IGNORED) */
+       case '\023': /* XOFF (IGNORED) */
+       case 0177:   /* DEL (IGNORED) */
+               return;
+       case 0x80:   /* TODO: PAD */
+       case 0x81:   /* TODO: HOP */
+       case 0x82:   /* TODO: BPH */
+       case 0x83:   /* TODO: NBH */
+       case 0x84:   /* TODO: IND */
+               break;
+       case 0x85:   /* NEL -- Next line */
+               tnewline(1); /* always go to first col */
+               break;
+       case 0x86:   /* TODO: SSA */
+       case 0x87:   /* TODO: ESA */
+               break;
+       case 0x88:   /* HTS -- Horizontal tab stop */
+               term.tabs[term.c.x] = 1;
+               break;
+       case 0x89:   /* TODO: HTJ */
+       case 0x8a:   /* TODO: VTS */
+       case 0x8b:   /* TODO: PLD */
+       case 0x8c:   /* TODO: PLU */
+       case 0x8d:   /* TODO: RI */
+       case 0x8e:   /* TODO: SS2 */
+       case 0x8f:   /* TODO: SS3 */
+       case 0x91:   /* TODO: PU1 */
+       case 0x92:   /* TODO: PU2 */
+       case 0x93:   /* TODO: STS */
+       case 0x94:   /* TODO: CCH */
+       case 0x95:   /* TODO: MW */
+       case 0x96:   /* TODO: SPA */
+       case 0x97:   /* TODO: EPA */
+       case 0x98:   /* TODO: SOS */
+       case 0x99:   /* TODO: SGCI */
+               break;
+       case 0x9a:   /* DECID -- Identify Terminal */
+               ttywrite(vtiden, strlen(vtiden), 0);
+               break;
+       case 0x9b:   /* TODO: CSI */
+       case 0x9c:   /* TODO: ST */
+               break;
+       case 0x90:   /* DCS -- Device Control String */
+       case 0x9d:   /* OSC -- Operating System Command */
+       case 0x9e:   /* PM -- Privacy Message */
+       case 0x9f:   /* APC -- Application Program Command */
+               tstrsequence(ascii);
+               return;
+       }
+       /* only CAN, SUB, \a and C1 chars interrupt a sequence */
+       term.esc &= ~(ESC_STR_END|ESC_STR);

 }
 
 }
 

-void
-xseturgency(int add) {
-       XWMHints *h = XGetWMHints(xw.dpy, xw.win);
-
-       h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
-       XSetWMHints(xw.dpy, xw.win, h);
-       XFree(h);
+/*
+ * returns 1 when the sequence is finished and it hasn't to read
+ * more characters for this sequence, otherwise 0
+ */
+int
+eschandle(uchar ascii)
+{
+       switch (ascii) {
+       case '[':
+               term.esc |= ESC_CSI;
+               return 0;
+       case '#':
+               term.esc |= ESC_TEST;
+               return 0;
+       case '%':
+               term.esc |= ESC_UTF8;
+               return 0;
+       case 'P': /* DCS -- Device Control String */
+       case '_': /* APC -- Application Program Command */
+       case '^': /* PM -- Privacy Message */
+       case ']': /* OSC -- Operating System Command */
+       case 'k': /* old title set compatibility */
+               tstrsequence(ascii);
+               return 0;
+       case 'n': /* LS2 -- Locking shift 2 */
+       case 'o': /* LS3 -- Locking shift 3 */
+               term.charset = 2 + (ascii - 'n');
+               break;
+       case '(': /* GZD4 -- set primary charset G0 */
+       case ')': /* G1D4 -- set secondary charset G1 */
+       case '*': /* G2D4 -- set tertiary charset G2 */
+       case '+': /* G3D4 -- set quaternary charset G3 */
+               term.icharset = ascii - '(';
+               term.esc |= ESC_ALTCHARSET;
+               return 0;
+       case 'D': /* IND -- Linefeed */
+               if (term.c.y == term.bot) {
+                       tscrollup(term.top, 1);
+               } else {
+                       tmoveto(term.c.x, term.c.y+1);
+               }
+               break;
+       case 'E': /* NEL -- Next line */
+               tnewline(1); /* always go to first col */
+               break;
+       case 'H': /* HTS -- Horizontal tab stop */
+               term.tabs[term.c.x] = 1;
+               break;
+       case 'M': /* RI -- Reverse index */
+               if (term.c.y == term.top) {
+                       tscrolldown(term.top, 1);
+               } else {
+                       tmoveto(term.c.x, term.c.y-1);
+               }
+               break;
+       case 'Z': /* DECID -- Identify Terminal */
+               ttywrite(vtiden, strlen(vtiden), 0);
+               break;
+       case 'c': /* RIS -- Reset to initial state */
+               treset();
+               resettitle();
+               xloadcols();
+               break;
+       case '=': /* DECPAM -- Application keypad */
+               xsetmode(1, MODE_APPKEYPAD);
+               break;
+       case '>': /* DECPNM -- Normal keypad */
+               xsetmode(0, MODE_APPKEYPAD);
+               break;
+       case '7': /* DECSC -- Save Cursor */
+               tcursor(CURSOR_SAVE);
+               break;
+       case '8': /* DECRC -- Restore Cursor */
+               tcursor(CURSOR_LOAD);
+               break;
+       case '\\': /* ST -- String Terminator */
+               if (term.esc & ESC_STR_END)
+                       strhandle();
+               break;
+       default:
+               fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
+                       (uchar) ascii, isprint(ascii)? ascii:'.');
+               break;
+       }
+       return 1;

 }
 
 void
 }
 
 void

-focus(XEvent *ev) {
-       if(ev->type == FocusIn) {
-               XSetICFocus(xw.xic);
-               xw.state |= WIN_FOCUSED;
-               xseturgency(0);
+tputc(Rune u)
+{
+       char c[UTF_SIZ];
+       int control;
+       int width, len;
+       Glyph *gp;
+
+       control = ISCONTROL(u);
+       if (u < 127 || !IS_SET(MODE_UTF8)) {
+               c[0] = u;
+               width = len = 1;

        } else {
        } else {

-               XUnsetICFocus(xw.xic);
-               xw.state &= ~WIN_FOCUSED;
+               len = utf8encode(u, c);
+               if (!control && (width = wcwidth(u)) == -1)
+                       width = 1;

        }
        }

-}

 
 

-inline bool
-match(uint mask, uint state) {
-       if(mask == XK_NO_MOD && state)
-               return false;
-       if(mask != XK_ANY_MOD && mask != XK_NO_MOD && !state)
-               return false;
-       if((state & mask) != state)
-               return false;
-       return true;
-}
+       if (IS_SET(MODE_PRINT))
+               tprinter(c, len);

 
 

-char*
-kmap(KeySym k, uint state) {
-       uint mask;
-       Key *kp;
-       int i;
+       /*
+        * STR sequence must be checked before anything else
+        * because it uses all following characters until it
+        * receives a ESC, a SUB, a ST or any other C1 control
+        * character.
+        */
+       if (term.esc & ESC_STR) {
+               if (u == '\a' || u == 030 || u == 032 || u == 033 ||
+                  ISCONTROLC1(u)) {
+                       term.esc &= ~(ESC_START|ESC_STR);
+                       term.esc |= ESC_STR_END;
+                       goto check_control_code;
+               }

 
 

-       /* Check for mapped keys out of X11 function keys. */
-       for(i = 0; i < LEN(mappedkeys); i++) {
-               if(mappedkeys[i] == k)
-                       break;
+               if (strescseq.len+len >= strescseq.siz) {
+                       /*
+                        * Here is a bug in terminals. If the user never sends
+                        * some code to stop the str or esc command, then st
+                        * will stop responding. But this is better than
+                        * silently failing with unknown characters. At least
+                        * then users will report back.
+                        *
+                        * In the case users ever get fixed, here is the code:
+                        */
+                       /*
+                        * term.esc = 0;
+                        * strhandle();
+                        */
+                       if (strescseq.siz > (SIZE_MAX - UTF_SIZ) / 2)
+                               return;
+                       strescseq.siz *= 2;
+                       strescseq.buf = xrealloc(strescseq.buf, strescseq.siz);
+               }
+
+               memmove(&strescseq.buf[strescseq.len], c, len);
+               strescseq.len += len;
+               return;

        }
        }

-       if(i == LEN(mappedkeys)) {
-               if((k & 0xFFFF) < 0xFF00)
-                       return NULL;
+
+check_control_code:
+       /*
+        * Actions of control codes must be performed as soon they arrive
+        * because they can be embedded inside a control sequence, and
+        * they must not cause conflicts with sequences.
+        */
+       if (control) {
+               tcontrolcode(u);
+               /*
+                * control codes are not shown ever
+                */
+               if (!term.esc)
+                       term.lastc = 0;
+               return;
+       } else if (term.esc & ESC_START) {
+               if (term.esc & ESC_CSI) {
+                       csiescseq.buf[csiescseq.len++] = u;
+                       if (BETWEEN(u, 0x40, 0x7E)
+                                       || csiescseq.len >= \
+                                       sizeof(csiescseq.buf)-1) {
+                               term.esc = 0;
+                               csiparse();
+                               csihandle();
+                       }
+                       return;
+               } else if (term.esc & ESC_UTF8) {
+                       tdefutf8(u);
+               } else if (term.esc & ESC_ALTCHARSET) {
+                       tdeftran(u);
+               } else if (term.esc & ESC_TEST) {
+                       tdectest(u);
+               } else {
+                       if (!eschandle(u))
+                               return;
+                       /* sequence already finished */
+               }
+               term.esc = 0;
+               /*
+                * All characters which form part of a sequence are not
+                * printed
+                */
+               return;

        }
        }

+       if (selected(term.c.x, term.c.y))
+               selclear();

 
 

-       for(kp = key; kp < key + LEN(key); kp++) {
-               mask = kp->mask;
+       gp = &term.line[term.c.y][term.c.x];
+       if (IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
+               gp->mode |= ATTR_WRAP;
+               tnewline(1);
+               gp = &term.line[term.c.y][term.c.x];
+       }

 
 

-               if(kp->k != k)
-                       continue;
+       if (IS_SET(MODE_INSERT) && term.c.x+width < term.col)
+               memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));

 
 

-               if(!match(mask, state))
-                       continue;
+       if (term.c.x+width > term.col) {
+               tnewline(1);
+               gp = &term.line[term.c.y][term.c.x];
+       }

 
 

-               if((kp->appkey < 0 && IS_SET(MODE_APPKEYPAD)) ||
-                               (kp->appkey > 0 && !IS_SET(MODE_APPKEYPAD))) {
-                       continue;
-               }
+       tsetchar(u, &term.c.attr, term.c.x, term.c.y);
+       term.lastc = u;

 
 

-               if((kp->appcursor < 0 && IS_SET(MODE_APPCURSOR)) ||
-                               (kp->appcursor > 0 && !IS_SET(MODE_APPCURSOR))) {
-                       continue;
+       if (width == 2) {
+               gp->mode |= ATTR_WIDE;
+               if (term.c.x+1 < term.col) {
+                       if (gp[1].mode == ATTR_WIDE && term.c.x+2 < term.col) {
+                               gp[2].u = ' ';
+                               gp[2].mode &= ~ATTR_WDUMMY;
+                       }
+                       gp[1].u = '\0';
+                       gp[1].mode = ATTR_WDUMMY;

                }
                }

+       }
+       if (term.c.x+width < term.col) {
+               tmoveto(term.c.x+width, term.c.y);
+       } else {
+               term.c.state |= CURSOR_WRAPNEXT;
+       }
+}

 
 

-               if((kp->crlf < 0 && IS_SET(MODE_CRLF)) ||
-                               (kp->crlf > 0 && !IS_SET(MODE_CRLF))) {
-                       continue;
+int
+twrite(const char *buf, int buflen, int show_ctrl)
+{
+       int charsize;
+       Rune u;
+       int n;
+
+       for (n = 0; n < buflen; n += charsize) {
+               if (IS_SET(MODE_UTF8)) {
+                       /* process a complete utf8 char */
+                       charsize = utf8decode(buf + n, &u, buflen - n);
+                       if (charsize == 0)
+                               break;
+               } else {
+                       u = buf[n] & 0xFF;
+                       charsize = 1;

                }
                }

-
-               return kp->s;
+               if (show_ctrl && ISCONTROL(u)) {
+                       if (u & 0x80) {
+                               u &= 0x7f;
+                               tputc('^');
+                               tputc('[');
+                       } else if (u != '\n' && u != '\r' && u != '\t') {
+                               u ^= 0x40;
+                               tputc('^');
+                       }
+               }
+               tputc(u);

        }
        }

-
-       return NULL;
+       return n;

 }
 
 void
 }
 
 void

-kpress(XEvent *ev) {
-       XKeyEvent *e = &ev->xkey;
-       KeySym ksym;
-       char xstr[31], buf[32], *customkey, *cp = buf;
-       int len;
-       Status status;
-       Shortcut *bp;
+tresize(int col, int row)
+{
+       int i;
+       int minrow = MIN(row, term.row);
+       int mincol = MIN(col, term.col);
+       int *bp;
+       TCursor c;

 
 

-       if (IS_SET(MODE_KBDLOCK))
+       if (col < 1 || row < 1) {
+               fprintf(stderr,
+                       "tresize: error resizing to %dx%d\n", col, row);

                return;
                return;

-
-       len = XmbLookupString(xw.xic, e, xstr, sizeof(xstr), &ksym, &status);
-       e->state &= ~Mod2Mask;
-       /* 1. shortcuts */
-       for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
-               if(ksym == bp->keysym && match(bp->mod, e->state)) {
-                       bp->func(&(bp->arg));
-                       return;
-               }

        }
 
        }
 

-       /* 2. custom keys from config.h */
-       if((customkey = kmap(ksym, e->state))) {
-               len = strlen(customkey);
-               memcpy(buf, customkey, len);
-       /* 2. hardcoded (overrides X lookup) */
-       } else {
-               if(len == 0)
-                       return;
+       /*
+        * slide screen to keep cursor where we expect it -
+        * tscrollup would work here, but we can optimize to
+        * memmove because we're freeing the earlier lines
+        */
+       for (i = 0; i <= term.c.y - row; i++) {
+               free(term.line[i]);
+               free(term.alt[i]);
+       }
+       /* ensure that both src and dst are not NULL */
+       if (i > 0) {
+               memmove(term.line, term.line + i, row * sizeof(Line));
+               memmove(term.alt, term.alt + i, row * sizeof(Line));
+       }
+       for (i += row; i < term.row; i++) {
+               free(term.line[i]);
+               free(term.alt[i]);
+       }

 
 

-               if (len == 1 && e->state & Mod1Mask)
-                       *cp++ = '\033';
+       /* resize to new height */
+       term.line = xrealloc(term.line, row * sizeof(Line));
+       term.alt  = xrealloc(term.alt,  row * sizeof(Line));
+       term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
+       term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));

 
 

-               memcpy(cp, xstr, len);
-               len = cp - buf + len;
+       /* resize each row to new width, zero-pad if needed */
+       for (i = 0; i < minrow; i++) {
+               term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
+               term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));

        }
 
        }
 

-       ttywrite(buf, len);
-       if(IS_SET(MODE_ECHO))
-               techo(buf, len);
-}
-
+       /* allocate any new rows */
+       for (/* i = minrow */; i < row; i++) {
+               term.line[i] = xmalloc(col * sizeof(Glyph));
+               term.alt[i] = xmalloc(col * sizeof(Glyph));
+       }
+       if (col > term.col) {
+               bp = term.tabs + term.col;

 
 

-void
-cmessage(XEvent *e) {
-       /* See xembed specs
-          http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
-       if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
-               if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
-                       xw.state |= WIN_FOCUSED;
-                       xseturgency(0);
-               } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
-                       xw.state &= ~WIN_FOCUSED;
+               memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
+               while (--bp > term.tabs && !*bp)
+                       /* nothing */ ;
+               for (bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
+                       *bp = 1;
+       }
+       /* update terminal size */
+       term.col = col;
+       term.row = row;
+       /* reset scrolling region */
+       tsetscroll(0, row-1);
+       /* make use of the LIMIT in tmoveto */
+       tmoveto(term.c.x, term.c.y);
+       /* Clearing both screens (it makes dirty all lines) */
+       c = term.c;
+       for (i = 0; i < 2; i++) {
+               if (mincol < col && 0 < minrow) {
+                       tclearregion(mincol, 0, col - 1, minrow - 1);
+               }
+               if (0 < col && minrow < row) {
+                       tclearregion(0, minrow, col - 1, row - 1);

                }
                }

-       } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
-               /* Send SIGHUP to shell */
-               kill(pid, SIGHUP);
-               exit(EXIT_SUCCESS);
+               tswapscreen();
+               tcursor(CURSOR_LOAD);

        }
        }

+       term.c = c;

 }
 
 void
 }
 
 void

-cresize(int width, int height)
+resettitle(void)

 {
 {

-       int col, row;
-
-       if(width != 0)
-               xw.w = width;
-       if(height != 0)
-               xw.h = height;
-
-       col = (xw.w - 2*borderpx) / xw.cw;
-       row = (xw.h - 2*borderpx) / xw.ch;
-
-       tresize(col, row);
-       xresize(col, row);
-       ttyresize();
+       xsettitle(NULL);

 }
 
 void
 }
 
 void

-resize(XEvent *e) {
-       if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
-               return;
-
-       cresize(e->xconfigure.width, e->xconfigure.height);
-}
-
-void
-run(void) {
-       XEvent ev;
-       fd_set rfd;
-       int xfd = XConnectionNumber(xw.dpy), i;
-       struct timeval drawtimeout, *tv = NULL;
-
-       for(i = 0;; i++) {
-               FD_ZERO(&rfd);
-               FD_SET(cmdfd, &rfd);
-               FD_SET(xfd, &rfd);
-               if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
-                       if(errno == EINTR)
-                               continue;
-                       die("select failed: %s\n", SERRNO);
-               }
-
-               /*
-                * Stop after a certain number of reads so the user does not
-                * feel like the system is stuttering.
-                */
-               if(i < 1000 && FD_ISSET(cmdfd, &rfd)) {
-                       ttyread();
+drawregion(int x1, int y1, int x2, int y2)
+{
+       int y;

 
 

-                       /*
-                        * Just wait a bit so it isn't disturbing the
-                        * user and the system is able to write something.
-                        */
-                       drawtimeout.tv_sec = 0;
-                       drawtimeout.tv_usec = 5;
-                       tv = &drawtimeout;
+       for (y = y1; y < y2; y++) {
+               if (!term.dirty[y])

                        continue;
                        continue;

-               }
-               i = 0;
-               tv = NULL;

 
 

-               while(XPending(xw.dpy)) {
-                       XNextEvent(xw.dpy, &ev);
-                       if(XFilterEvent(&ev, None))
-                               continue;
-                       if(handler[ev.type])
-                               (handler[ev.type])(&ev);
-               }
-
-               draw();
-               XFlush(xw.dpy);
+               term.dirty[y] = 0;
+               xdrawline(term.line[y], x1, y, x2);

        }
 }
 
        }
 }
 

-int
-main(int argc, char *argv[]) {
-       int i, bitm, xr, yr;
-       uint wr, hr;
-
-       xw.fw = xw.fh = xw.fx = xw.fy = 0;
-       xw.isfixed = False;
-
-       for(i = 1; i < argc; i++) {
-               switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
-               case 'c':
-                       if(++i < argc)
-                               opt_class = argv[i];
-                       break;
-               case 'e':
-                       /* eat all remaining arguments */
-                       if(++i < argc)
-                               opt_cmd = &argv[i];
-                       goto run;
-               case 'f':
-                       if(++i < argc)
-                               opt_font = argv[i];
-                       break;
-               case 'g':
-                       if(++i >= argc)
-                               break;
+void
+draw(void)
+{
+       int cx = term.c.x, ocx = term.ocx, ocy = term.ocy;

 
 

-                       bitm = XParseGeometry(argv[i], &xr, &yr, &wr, &hr);
-                       if(bitm & XValue)
-                               xw.fx = xr;
-                       if(bitm & YValue)
-                               xw.fy = yr;
-                       if(bitm & WidthValue)
-                               xw.fw = (int)wr;
-                       if(bitm & HeightValue)
-                               xw.fh = (int)hr;
-                       if(bitm & XNegative && xw.fx == 0)
-                               xw.fx = -1;
-                       if(bitm & XNegative && xw.fy == 0)
-                               xw.fy = -1;
-
-                       if(xw.fh != 0 && xw.fw != 0)
-                               xw.isfixed = True;
-                       break;
-               case 'o':
-                       if(++i < argc)
-                               opt_io = argv[i];
-                       break;
-               case 't':
-                       if(++i < argc)
-                               opt_title = argv[i];
-                       break;
-               case 'v':
-               default:
-                       die(USAGE);
-               case 'w':
-                       if(++i < argc)
-                               opt_embed = argv[i];
-                       break;
-               }
-       }
+       if (!xstartdraw())
+               return;

 
 

-run:
-       setlocale(LC_CTYPE, "");
-       XSetLocaleModifiers("");
-       tnew(80, 24);
-       xinit();
-       ttynew();
-       selinit();
-       run();
+       /* adjust cursor position */
+       LIMIT(term.ocx, 0, term.col-1);
+       LIMIT(term.ocy, 0, term.row-1);
+       if (term.line[term.ocy][term.ocx].mode & ATTR_WDUMMY)
+               term.ocx--;
+       if (term.line[term.c.y][cx].mode & ATTR_WDUMMY)
+               cx--;

 
 

-       return 0;
+       drawregion(0, 0, term.col, term.row);
+       xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
+                       term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
+       term.ocx = cx;
+       term.ocy = term.c.y;
+       xfinishdraw();
+       if (ocx != term.ocx || ocy != term.ocy)
+               xximspot(term.ocx, term.ocy);

 }
 
 }
 

+void
+redraw(void)
+{
+       tfulldirt();
+       draw();
+}