added F1-12 key, fixed DCH and ICH.

[st.git] / st.c

diff --git a/st.c b/st.c
index 8a8804f..6e34f1e 100644 (file)
--- a/st.c
+++ b/st.c
@@ -1,17 +1,1368 @@
-/* See LICENSE file for copyright and license details. */
+/* See LICENSE for licence details. */
+#define _XOPEN_SOURCE 600
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <locale.h>
+#include <stdarg.h>

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.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/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <X11/Xlib.h>
+#include <X11/keysym.h>
+#include <X11/Xutil.h>

 
 

-int
-main(int argc, char *argv[]) {
-       if(argc == 2 && !strcmp("-v", argv[1])) {
-               fprintf(stderr, "st-"VERSION", © 2007-2008 st engineers, see LICENSE for details\n");
-               exit(EXIT_SUCCESS);
+/* Arbitrary sizes */
+#define ESC_TITLE_SIZ 256
+#define ESC_BUF_SIZ   256
+#define ESC_ARG_SIZ   16
+#define DRAW_BUF_SIZ  1024
+
+#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)
+
+/* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
+enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
+enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW, 
+       CURSOR_SAVE, CURSOR_LOAD };
+enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
+enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
+enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
+enum { SCREEN_UPDATE, SCREEN_REDRAW };
+
+typedef struct {
+       char c;     /* character code  */
+       char mode;  /* attribute flags */
+       int fg;     /* foreground      */
+       int bg;     /* background      */
+       char state; /* state flags     */
+} Glyph;
+
+typedef Glyph* Line;
+
+typedef struct {
+       Glyph attr;      /* current char attributes */
+       int x;
+       int y;
+} TCursor;
+
+/* CSI Escape sequence structs */
+/* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
+typedef struct {
+       char buf[ESC_BUF_SIZ]; /* raw string */
+       int len;                           /* raw string length */
+       char priv;
+       int arg[ESC_ARG_SIZ];
+       int narg;                          /* nb of args */
+       char mode;
+} CSIEscape;
+
+/* Internal representation of the screen */
+typedef struct {
+       int row;        /* nb row */  
+       int col;        /* nb col */
+       Line* line; /* screen */
+       TCursor c;      /* cursor */
+       char hidec;
+       int top;        /* top    scroll limit */
+       int bot;        /* bottom scroll limit */
+       int mode;       /* terminal mode flags */
+       int esc;        /* escape state flags */
+       char title[ESC_TITLE_SIZ];
+       int titlelen;
+} Term;
+
+/* Purely graphic info */
+typedef struct {
+       Display* dis;
+       Window win;
+       Pixmap buf;
+       int scr;
+       int w;  /* window width  */
+       int h;  /* window height */
+       int bufw; /* pixmap width  */
+       int bufh; /* pixmap height */
+       int ch; /* char height */
+       int cw; /* char width  */
+} XWindow; 
+
+typedef struct {
+       KeySym k;
+       char s[ESC_BUF_SIZ];
+} Key;
+
+/* Drawing Context */
+typedef struct {
+       unsigned long col[256];
+       XFontStruct* font;
+       XFontStruct* bfont;
+       GC gc;
+} DC;
+
+#include "config.h"
+
+static void die(const char *errstr, ...);
+static void draw(int);
+static void execsh(void);
+static void sigchld(int);
+static void run(void);
+
+static void csidump(void);
+static void csihandle(void);
+static void csiparse(void);
+static void csireset(void);
+
+static void tclearregion(int, int, int, int);
+static void tcursor(int);
+static void tmovecursor(int);
+static void tdeletechar(int);
+static void tdeleteline(int);
+static void tinsertblank(int);
+static void tinsertblankline(int);
+static void tmoveto(int, int);
+static void tnew(int, int);
+static void tnewline(void);
+static void tputc(char);
+static void tputs(char*, int);
+static void treset(void);
+static void tresize(int, int);
+static void tscroll(void);
+static void tscrollup(int);
+static void tscrolldown(int);
+static void tsetattr(int*, int);
+static void tsetchar(char);
+static void tsetscroll(int, int);
+
+static void ttynew(void);
+static void ttyread(void);
+static void ttyresize(int, int);
+static void ttywrite(const char *, size_t);
+
+static void xclear(int, int, int, int);
+static void xcursor(int);
+static void xinit(void);
+static void xloadcols(void);
+
+static void expose(XEvent *);
+static char* kmap(KeySym);
+static void kpress(XEvent *);
+static void resize(XEvent *);
+
+static void (*handler[LASTEvent])(XEvent *) = {
+       [KeyPress] = kpress,
+       [Expose] = expose,
+       [ConfigureNotify] = resize
+};
+
+/* Globals */
+static DC dc;
+static XWindow xw;
+static Term term;
+static CSIEscape escseq;
+static int cmdfd;
+static pid_t pid;
+static int running;
+
+#ifdef DEBUG
+void
+tdump(void) {
+       int row, col;
+       Glyph c;
+
+       for(row = 0; row < term.row; row++) {
+               for(col = 0; col < term.col; col++) {
+                       if(col == term.c.x && row == term.c.y)
+                               putchar('#');
+                       else {
+                               c = term.line[row][col];
+                               putchar(c.state & GLYPH_SET ? c.c : '.');
+                       }
+               }
+               putchar('\n');

        }
        }

-       else if(argc != 1) {
-               fprintf(stderr, "usage: st [-v]\n");
+}
+#endif
+
+void
+die(const char *errstr, ...) {
+       va_list ap;
+
+       va_start(ap, errstr);
+       vfprintf(stderr, errstr, ap);
+       va_end(ap);
+       exit(EXIT_FAILURE);
+}
+
+void
+execsh(void) {
+       char *args[3] = {getenv("SHELL"), "-i", NULL};
+       DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
+       putenv("TERM=" TNAME);
+       execvp(args[0], args);
+}
+
+void
+xbell(void) { /* visual bell */
+       XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
+       XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
+       XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
+       /* usleep(30000); */
+       draw(SCREEN_REDRAW);
+}
+
+void 
+sigchld(int a) {
+       int stat = 0;
+       if(waitpid(pid, &stat, 0) < 0)
+               die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
+       if(WIFEXITED(stat))
+               exit(WEXITSTATUS(stat));
+       else

                exit(EXIT_FAILURE);
                exit(EXIT_FAILURE);

+}
+
+void
+ttynew(void) {
+       int m, s;
+       char *pts;
+
+       if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
+               die("openpt failed: %s\n", SERRNO);
+       if(grantpt(m) < 0)
+               die("grandpt failed: %s\n", SERRNO);
+       if(unlockpt(m) < 0)
+               die("unlockpt failed: %s\n", SERRNO);
+       if(!(pts = ptsname(m)))
+               die("ptsname failed: %s\n", SERRNO);
+       if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
+               die("Couldn't open slave: %s\n", SERRNO);
+       fcntl(s, F_SETFL, O_NDELAY);
+       switch(pid = fork()) {
+       case -1:
+               die("fork failed\n");
+               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 TTIOCSTTY failed: %s\n", SERRNO);
+               execsh();
+               break;
+       default:
+               close(s);
+               cmdfd = m;
+               signal(SIGCHLD, sigchld);
+       }
+}
+
+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) {
+       char buf[BUFSIZ] = {0};
+       int ret;
+
+       if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
+               die("Couldn't read from shell: %s\n", SERRNO);
+       else
+               tputs(buf, ret);
+}
+
+void
+ttywrite(const char *s, size_t n) {
+       if(write(cmdfd, s, n) == -1)
+               die("write error on tty: %s\n", SERRNO);
+}
+
+void
+ttyresize(int x, int y) {
+       struct winsize w;
+
+       w.ws_row = term.row;
+       w.ws_col = term.col;
+       w.ws_xpixel = w.ws_ypixel = 0;
+       if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
+               fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
+}
+
+void
+tcursor(int mode) {
+       static TCursor c;
+
+       if(mode == CURSOR_SAVE)
+               c = term.c;
+       else if(mode == CURSOR_LOAD)
+               term.c = c, tmoveto(c.x, c.y);
+}
+
+void
+treset(void) {
+       term.c.attr.mode = ATTR_NULL;
+       term.c.attr.fg = DefaultFG;
+       term.c.attr.bg = DefaultBG;
+       term.c.x = term.c.y = 0;
+       term.hidec = 0;
+       term.top = 0, term.bot = term.row - 1;
+       term.mode = MODE_WRAP;
+       tclearregion(0, 0, term.col-1, term.row-1);
+}
+
+void
+tnew(int col, int row) {   /* screen size */
+       term.row = row, term.col = col;
+       term.top = 0, term.bot = term.row - 1;
+       /* mode */
+       term.mode = MODE_WRAP;
+       /* cursor */
+       term.c.attr.mode = ATTR_NULL;
+       term.c.attr.fg = DefaultFG;
+       term.c.attr.bg = DefaultBG;
+       term.c.x = term.c.y = 0;
+       term.hidec = 0;
+       /* allocate screen */
+       term.line = calloc(term.row, sizeof(Line));
+       for(row = 0 ; row < term.row; row++)
+               term.line[row] = calloc(term.col, sizeof(Glyph));
+}
+
+/* TODO: Replace with scrollup/scolldown */
+void
+tscroll(void) {
+       Line temp = term.line[term.top];
+       int i;
+
+       for(i = term.top; i < term.bot; i++)
+               term.line[i] = term.line[i+1];
+       memset(temp, 0, sizeof(Glyph) * term.col);
+       term.line[term.bot] = temp;
+}
+
+void
+tscrolldown (int n) {
+       int i;
+       Line temp;
+       
+       LIMIT(n, 0, term.bot-term.top+1);
+
+       for(i = 0; i < n; i++)
+               memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
+       
+       for(i = term.bot; i >= term.top+n; i--) {
+               temp = term.line[i];
+               term.line[i] = term.line[i-n];
+               term.line[i-n] = temp;
+       }
+}
+
+void
+tscrollup (int n) {
+       int i;
+       Line temp;
+       LIMIT(n, 0, term.bot-term.top+1);
+       
+       for(i = 0; i < n; i++)
+               memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
+       
+        for(i = term.top; i <= term.bot-n; i++) { 
+                temp = term.line[i];
+                term.line[i] = term.line[i+n]; 
+                term.line[i+n] = temp;
+        }
+}
+
+void
+tnewline(void) {
+       int y = term.c.y + 1;
+       if(y > term.bot)
+               tscroll(), y = term.bot;
+       tmoveto(0, y);
+}
+
+void
+csiparse(void) {
+       /* int noarg = 1; */
+       char *p = escseq.buf;
+
+       escseq.narg = 0;
+       if(*p == '?')
+               escseq.priv = 1, p++;
+       
+       while(p < escseq.buf+escseq.len) {
+               while(isdigit(*p)) {
+                       escseq.arg[escseq.narg] *= 10;
+                       escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
+               }
+               if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
+                       escseq.narg++, p++;
+               else {
+                       escseq.mode = *p;
+                       escseq.narg++;
+                       return;
+               }
+       }
+}
+
+void
+tmoveto(int x, int y) {
+       term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
+       term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
+}
+
+void
+tmovecursor(int dir) {
+       int xf = term.c.x, yf = term.c.y;
+       
+       switch(dir) {
+       case CURSOR_UP:
+               yf--;
+               break;
+       case CURSOR_DOWN:
+               yf++;
+               break;
+       case CURSOR_LEFT:
+               xf--;
+               if(term.mode & MODE_WRAP && xf < 0) {
+                       xf = term.col-1, yf--;
+                       if(yf < term.top)
+                               yf = term.top, xf = 0;
+               }
+               break;
+       case CURSOR_RIGHT:
+               xf++;
+               if(term.mode & MODE_WRAP && xf >= term.col) {
+                       xf = 0, yf++;
+                       if(yf > term.bot)
+                               yf = term.bot, tscroll();
+               }
+               break;
+       }
+       tmoveto(xf, yf);
+}
+       
+void
+tsetchar(char c) {
+       term.line[term.c.y][term.c.x] = term.c.attr;
+       term.line[term.c.y][term.c.x].c = c;
+       term.line[term.c.y][term.c.x].state |= GLYPH_SET;
+}
+
+void
+tclearregion(int x1, int y1, int x2, int y2) {
+       int y, temp;
+
+       if(x1 > x2)
+               temp = x1, x1 = x2, x2 = temp;
+       if(y1 > y2)
+               temp = y1, y1 = y2, y2 = temp;
+
+       LIMIT(x1, 0, term.col-1);
+       LIMIT(x2, 0, term.col-1);
+       LIMIT(y1, 0, term.row-1);
+       LIMIT(y2, 0, term.row-1);
+
+       for(y = y1; y <= y2; y++)
+               memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
+}
+
+void
+tdeletechar(int n) {
+       int src = term.c.x + n;
+       int dst = term.c.x;
+       int size = term.col - src;
+
+       if(src >= term.col) {
+               tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
+               return;
+       }
+       memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
+       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;
+
+       if(dst >= term.col) {
+               tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
+               return;
+       }
+       memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
+       tclearregion(src, term.c.y, dst - 1, term.c.y);
+}
+
+void
+tinsertblankline(int n) {
+       int i;
+       Line blank;
+       int bot = term.bot;
+
+       if(term.c.y > term.bot)
+               bot = term.row - 1;
+       else if(term.c.y < term.top)
+               bot = term.top - 1;
+       if(term.c.y + n >= bot) {
+               tclearregion(0, term.c.y, term.col-1, bot);
+               return;
+       }
+       for(i = bot; i >= term.c.y+n; i--) {
+               /* swap deleted line <-> blanked line */
+               blank = term.line[i];
+               term.line[i] = term.line[i-n];
+               term.line[i-n] = blank;
+               /* blank it */
+               memset(blank, 0, term.col * sizeof(Glyph));
+       }
+}
+
+void
+tdeleteline(int n) {
+       int i;
+       Line blank;
+       int bot = term.bot;
+
+       if(term.c.y > term.bot)
+               bot = term.row - 1;
+       else if(term.c.y < term.top)
+               bot = term.top - 1;
+       if(term.c.y + n >= bot) {
+               tclearregion(0, term.c.y, term.col-1, bot);
+               return;
+       }
+       for(i = term.c.y; i <= bot-n; i++) {
+               /* swap deleted line <-> blanked line */
+               blank = term.line[i];
+               term.line[i] = term.line[i+n];
+               term.line[i+n] = blank;
+               /* blank it */
+               memset(blank, 0, term.col * sizeof(Glyph));
+       }
+}
+
+void
+tsetattr(int *attr, int l) {
+       int i;
+
+       for(i = 0; i < l; i++) {
+               switch(attr[i]) {
+               case 0:
+                       term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
+                       term.c.attr.fg = DefaultFG;
+                       term.c.attr.bg = DefaultBG;
+                       break;
+               case 1:
+                       term.c.attr.mode |= ATTR_BOLD;   
+                       break;
+               case 4: 
+                       term.c.attr.mode |= ATTR_UNDERLINE;
+                       break;
+               case 7: 
+                       term.c.attr.mode |= ATTR_REVERSE;       
+                       break;
+               case 22: 
+                       term.c.attr.mode &= ~ATTR_BOLD;  
+                       break;
+               case 24: 
+                       term.c.attr.mode &= ~ATTR_UNDERLINE;
+                       break;
+               case 27: 
+                       term.c.attr.mode &= ~ATTR_REVERSE;       
+                       break;
+               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: gfx attr %d unknown\n", attr[i]); 
+                       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: gfx attr %d unknown\n", attr[i]); 
+                       break;
+               case 49:
+                       term.c.attr.bg = DefaultBG;
+                       break;
+               default:
+                       if(BETWEEN(attr[i], 30, 37))
+                               term.c.attr.fg = attr[i] - 30;
+                       else if(BETWEEN(attr[i], 40, 47))
+                               term.c.attr.bg = attr[i] - 40;
+                       else if(BETWEEN(attr[i], 90, 97))
+                               term.c.attr.fg = attr[i] - 90 + 8;
+                       else if(BETWEEN(attr[i], 100, 107))
+                               term.c.attr.fg = attr[i] - 100 + 8;
+                       else 
+                               fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]); 
+                       break;
+               }
+       }
+}
+
+void
+tsetscroll(int t, int b) {
+       int temp;
+
+       LIMIT(t, 0, term.row-1);
+       LIMIT(b, 0, term.row-1);
+       if(t > b) {
+               temp = t;
+               t = b;
+               b = temp;
+       }
+       term.top = t;
+       term.bot = b;    
+}
+
+void
+csihandle(void) {
+       switch(escseq.mode) {
+       default:
+       unknown:
+               printf("erresc: unknown csi ");
+               csidump();
+               /* die(""); */
+               break;
+       case '@': /* ICH -- Insert <n> blank char */
+               DEFAULT(escseq.arg[0], 1);
+               tinsertblank(escseq.arg[0]);
+               break;
+       case 'A': /* CUU -- Cursor <n> Up */
+       case 'e':
+               DEFAULT(escseq.arg[0], 1);
+               tmoveto(term.c.x, term.c.y-escseq.arg[0]);
+               break;
+       case 'B': /* CUD -- Cursor <n> Down */
+               DEFAULT(escseq.arg[0], 1);
+               tmoveto(term.c.x, term.c.y+escseq.arg[0]);
+               break;
+       case 'C': /* CUF -- Cursor <n> Forward */
+       case 'a':
+               DEFAULT(escseq.arg[0], 1);
+               tmoveto(term.c.x+escseq.arg[0], term.c.y);
+               break;
+       case 'D': /* CUB -- Cursor <n> Backward */
+               DEFAULT(escseq.arg[0], 1);
+               tmoveto(term.c.x-escseq.arg[0], term.c.y);
+               break;
+       case 'E': /* CNL -- Cursor <n> Down and first col */
+               DEFAULT(escseq.arg[0], 1);
+               tmoveto(0, term.c.y+escseq.arg[0]);
+               break;
+       case 'F': /* CPL -- Cursor <n> Up and first col */
+               DEFAULT(escseq.arg[0], 1);
+               tmoveto(0, term.c.y-escseq.arg[0]);
+               break;
+       case 'G': /* CHA -- Move to <col> */
+       case '`': /* XXX: HPA -- same? */
+               DEFAULT(escseq.arg[0], 1);
+               tmoveto(escseq.arg[0]-1, term.c.y);
+               break;
+       case 'H': /* CUP -- Move to <row> <col> */
+       case 'f': /* XXX: HVP -- same? */
+               DEFAULT(escseq.arg[0], 1);
+               DEFAULT(escseq.arg[1], 1);
+               tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
+               break;
+       /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
+       case 'J': /* ED -- Clear screen */
+               switch(escseq.arg[0]) {
+               case 0: /* below */
+                       tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
+                       break;
+               case 1: /* above */
+                       tclearregion(0, 0, term.c.x, term.c.y);
+                       break;
+               case 2: /* all */
+                       tclearregion(0, 0, term.col-1, term.row-1);
+                       break;
+               case 3: /* XXX: erase saved lines (xterm) */
+               default:
+                       goto unknown;
+               }
+               break;
+       case 'K': /* EL -- Clear line */
+               switch(escseq.arg[0]) {
+               case 0: /* right */
+                       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 2: /* all */
+                       tclearregion(0, term.c.y, term.col-1, term.c.y);
+                       break;
+               }
+               break;
+       case 'S': /* SU -- Scroll <n> line up */
+               DEFAULT(escseq.arg[0], 1);
+               tscrollup(escseq.arg[0]);
+               break;
+       case 'T': /* SD -- Scroll <n> line down */
+               DEFAULT(escseq.arg[0], 1);
+               tscrolldown(escseq.arg[0]);
+               break;
+       case 'L': /* IL -- Insert <n> blank lines */
+               DEFAULT(escseq.arg[0], 1);
+               tinsertblankline(escseq.arg[0]);
+               break;
+       case 'l': /* RM -- Reset Mode */
+               if(escseq.priv) {
+                       switch(escseq.arg[0]) {
+                       case 1:
+                               term.mode &= ~MODE_APPKEYPAD;
+                               break;
+                       case 7:
+                               term.mode &= ~MODE_WRAP;
+                               break;
+                       case 12: /* att610 -- Stop blinking cursor (IGNORED) */
+                               break;
+                       case 25:
+                               term.hidec = 1;
+                               break;
+                       case 1048: /* XXX: no alt. screen to erase/save */
+                       case 1049:
+                               tcursor(CURSOR_LOAD);
+                               tclearregion(0, 0, term.col-1, term.row-1);
+                               break;
+                       default:
+                               goto unknown;
+                       }
+               } else {
+                       switch(escseq.arg[0]) {
+                       case 4:
+                               term.mode &= ~MODE_INSERT;
+                               break;
+                       default:
+                               goto unknown;
+                       }
+               }
+               break;
+       case 'M': /* DL -- Delete <n> lines */
+               DEFAULT(escseq.arg[0], 1);
+               tdeleteline(escseq.arg[0]);
+               break;
+       case 'X': /* ECH -- Erase <n> char */
+               DEFAULT(escseq.arg[0], 1);
+               tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
+               break;
+       case 'P': /* DCH -- Delete <n> char */
+               DEFAULT(escseq.arg[0], 1);
+               tdeletechar(escseq.arg[0]);
+               break;
+       /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
+       case 'd': /* VPA -- Move to <row> */
+               DEFAULT(escseq.arg[0], 1);
+               tmoveto(term.c.x, escseq.arg[0]-1);
+               break;
+       case 'h': /* SM -- Set terminal mode */
+               if(escseq.priv) {
+                       switch(escseq.arg[0]) {
+                       case 1:
+                               term.mode |= MODE_APPKEYPAD;
+                               break;
+                       case 7:
+                               term.mode |= MODE_WRAP;
+                               break;
+                       case 12: /* att610 -- Start blinking cursor (IGNORED) */
+                               break;
+                       case 25:
+                               term.hidec = 0;
+                               break;
+                       case 1048: 
+                       case 1049: /* XXX: no alt. screen to erase/save */
+                               tcursor(CURSOR_SAVE);
+                               tclearregion(0, 0, term.col-1, term.row-1);
+                               break;
+                       default: goto unknown;
+                       }
+               } else {
+                       switch(escseq.arg[0]) {
+                       case 4:
+                               term.mode |= MODE_INSERT;
+                               break;
+                       default: goto unknown;
+                       }
+               };
+               break;
+       case 'm': /* SGR -- Terminal attribute (color) */
+               tsetattr(escseq.arg, escseq.narg);
+               break;
+       case 'r': /* DECSTBM -- Set Scrolling Region */
+               if(escseq.priv)
+                       goto unknown;
+               else {
+                       DEFAULT(escseq.arg[0], 1);
+                       DEFAULT(escseq.arg[1], term.row);
+                       tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
+               }
+               break;
+       case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
+               tcursor(CURSOR_SAVE);
+               break;
+       case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
+               tcursor(CURSOR_LOAD);
+               break;
+       }
+}
+
+void
+csidump(void) { 
+       int i;
+       printf("ESC [ %s", escseq.priv ? "? " : "");
+       if(escseq.narg)
+               for(i = 0; i < escseq.narg; i++)
+                       printf("%d ", escseq.arg[i]);
+       if(escseq.mode)
+               putchar(escseq.mode);
+       putchar('\n');
+}
+
+void
+csireset(void) {
+       memset(&escseq, 0, sizeof(escseq));
+}
+
+void
+tputtab(void) {
+       int space = TAB - term.c.x % TAB;
+       
+       if(term.c.x + space >= term.col)
+               space--;
+       
+       for(; space > 0; space--)
+               tmovecursor(CURSOR_RIGHT);
+}
+
+void
+tputc(char c) {
+       if(term.esc & ESC_START) {
+               if(term.esc & ESC_CSI) {
+                       escseq.buf[escseq.len++] = c;
+                       if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
+                               term.esc = 0;
+                               csiparse(), csihandle();
+                       }
+               } else if(term.esc & ESC_OSC) {
+                       if(c == ';') {
+                               term.titlelen = 0;
+                               term.esc = ESC_START | ESC_TITLE;
+                       }
+               } else if(term.esc & ESC_TITLE) {
+                       if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
+                               term.esc = 0;
+                               term.title[term.titlelen] = '\0';
+                               XStoreName(xw.dis, xw.win, term.title);
+                       } else {
+                               term.title[term.titlelen++] = c;
+                       }
+               } else if(term.esc & ESC_ALTCHARSET) {
+                       switch(c) {
+                       case '0': /* Line drawing crap */
+                               term.c.attr.mode |= ATTR_GFX;
+                               break;
+                       case 'B': /* Back to regular text */
+                               term.c.attr.mode &= ~ATTR_GFX;
+                               break;
+                       default:
+                               printf("esc unhandled charset: ESC ( %c\n", c);
+                       }
+                       term.esc = 0;
+               } else {
+                       switch(c) {
+                       case '[':
+                               term.esc |= ESC_CSI;
+                               break;
+                       case ']':
+                               term.esc |= ESC_OSC;
+                               break;
+                       case '(':
+                               term.esc |= ESC_ALTCHARSET;
+                               break;
+                       case 'A':
+                               tmoveto(term.c.x, term.c.y-1);
+                               term.esc = 0;
+                               break;
+                       case 'B':
+                               tmoveto(term.c.x, term.c.y+1);
+                               term.esc = 0;
+                               break;
+                       case 'C':
+                               tmoveto(term.c.x+1, term.c.y);
+                               term.esc = 0;
+                               break;
+                       case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
+                               tmoveto(term.c.x-1, term.c.y);
+                               term.esc = 0;
+                               break;
+                       case 'E': /* NEL -- Next line */
+                               tnewline();
+                               term.esc = 0;
+                               break;
+                       case 'M': /* RI -- Reverse index */
+                               if(term.c.y == term.top)
+                                       tscrolldown(1);
+                               else
+                                       tmoveto(term.c.x, term.c.y-1);
+                               term.esc = 0;
+                               break;
+                       case 'c': /* RIS -- Reset to inital state */
+                               treset();
+                               term.esc = 0;
+                               break;
+                       case '=': /* DECPAM */
+                               term.mode |= MODE_APPKEYPAD;
+                               term.esc = 0;
+                               break;
+                       case '>': /* DECPNM */
+                               term.mode &= ~MODE_APPKEYPAD;
+                               term.esc = 0;
+                               break;
+                       case '7':
+                               tcursor(CURSOR_SAVE);
+                               term.esc = 0;
+                               break;
+                       case '8':
+                               tcursor(CURSOR_LOAD);
+                               term.esc = 0;
+                               break;
+                       default:
+                               fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
+                               term.esc = 0;
+                       }
+               }
+       } else {
+               switch(c) {
+               case '\t':
+                       tputtab();
+                       break;
+               case '\b':
+                       tmovecursor(CURSOR_LEFT);
+                       break;
+               case '\r':
+                       tmoveto(0, term.c.y);
+                       break;
+               case '\n':
+                       tnewline();
+                       break;
+               case '\a':
+                       xbell();
+                       break;
+               case '\033':
+                       csireset();
+                       term.esc = ESC_START;
+                       break;
+               default:
+                       tsetchar(c);
+                       tmovecursor(CURSOR_RIGHT);
+                       break;
+               }
+       }
+}
+
+void
+tputs(char *s, int len) {
+       for(; len > 0; len--)
+               tputc(*s++);
+}
+
+void
+tresize(int col, int row) {
+       int i;
+       Line *line;
+       int minrow = MIN(row, term.row);
+       int mincol = MIN(col, term.col);
+
+       if(col < 1 || row < 1)
+               return;
+       /* alloc */
+       line = calloc(row, sizeof(Line));
+       for(i = 0 ; i < row; i++)
+               line[i] = calloc(col, sizeof(Glyph));
+       /* copy */
+       for(i = 0 ; i < minrow; i++)
+               memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
+       /* free */
+       for(i = 0; i < term.row; i++)
+               free(term.line[i]);
+       free(term.line);
+       
+       LIMIT(term.c.x, 0, col-1);
+       LIMIT(term.c.y, 0, row-1);
+       LIMIT(term.top, 0, row-1);
+       LIMIT(term.bot, 0, row-1);
+       
+       term.bot = row-1;
+       term.line = line;
+       term.col = col, term.row = row;
+}
+
+void
+xloadcols(void) {
+       int i, r, g, b;
+       XColor color;
+       Colormap cmap = DefaultColormap(xw.dis, xw.scr);
+       unsigned long white = WhitePixel(xw.dis, xw.scr);
+
+       for(i = 0; i < 16; i++) {
+               if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
+                       dc.col[i] = white;
+                       fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
+               } else
+                       dc.col[i] = color.pixel;

        }
        }

+
+       /* same colors as xterm */
+       for(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 (!XAllocColor(xw.dis, cmap, &color)) {
+                                       dc.col[i] = white;
+                                       fprintf(stderr, "Could not allocate color %d\n", i);
+                               } else
+                                       dc.col[i] = color.pixel;
+                               i++;
+                       }
+
+       for(r = 0; r < 24; r++, i++) {
+               color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
+               if (!XAllocColor(xw.dis, cmap, &color)) {
+                       dc.col[i] = white;
+                       fprintf(stderr, "Could not allocate color %d\n", i);
+               } else
+                       dc.col[i] = color.pixel;
+       }
+}
+
+void
+xclear(int x1, int y1, int x2, int y2) {
+       XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
+       XFillRectangle(xw.dis, xw.buf, dc.gc,
+                      x1 * xw.cw, y1 * xw.ch,
+                      (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
+}
+
+void
+xhints(void)
+{
+       XClassHint class = {TNAME, TNAME};
+       XWMHints wm = {.flags = InputHint, .input = 1};
+       XSizeHints size = {
+               .flags = PSize | PResizeInc | PBaseSize,
+               .height = xw.h,
+               .width = xw.w,
+               .height_inc = xw.ch,
+               .width_inc = xw.cw,
+               .base_height = 2*BORDER,
+               .base_width = 2*BORDER,
+       };
+       XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
+}
+
+void
+xinit(void) {
+       xw.dis = XOpenDisplay(NULL);
+       xw.scr = XDefaultScreen(xw.dis);
+       if(!xw.dis)
+               die("Can't open display\n");
+       
+       /* font */
+       if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
+               die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
+
+       /* XXX: Assuming same size for bold font */
+       xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
+       xw.ch = dc.font->ascent + dc.font->descent;
+
+       /* colors */
+       xloadcols();
+
+       term.c.attr.fg = DefaultFG;
+       term.c.attr.bg = DefaultBG;
+       term.c.attr.mode = ATTR_NULL;
+       /* windows */
+       xw.h = term.row * xw.ch + 2*BORDER;
+       xw.w = term.col * xw.cw + 2*BORDER;
+       xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
+                       xw.w, xw.h, 0,
+                       dc.col[DefaultBG],
+                       dc.col[DefaultBG]);
+       xw.bufw = xw.w - 2*BORDER;
+       xw.bufh = xw.h - 2*BORDER;
+       xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
+       /* gc */
+       dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
+       XMapWindow(xw.dis, xw.win);
+       xhints();
+       XStoreName(xw.dis, xw.win, "st");
+       XSync(xw.dis, 0);
+}
+
+void
+xdraws(char *s, Glyph base, int x, int y, int len) {
+       unsigned long xfg, xbg;
+       int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
+       int i;
+
+       if(base.mode & ATTR_REVERSE)
+               xfg = dc.col[base.bg], xbg = dc.col[base.fg];
+       else
+               xfg = dc.col[base.fg], xbg = dc.col[base.bg];
+
+       XSetBackground(xw.dis, dc.gc, xbg);
+       XSetForeground(xw.dis, dc.gc, xfg);
+       
+       if(base.mode & ATTR_GFX)
+               for(i = 0; i < len; i++)
+                       s[i] = gfx[(int)s[i]];
+
+       XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
+       XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
+       
+       if(base.mode & ATTR_UNDERLINE)
+               XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
+}
+
+void
+xcursor(int mode) {
+       static int oldx = 0;
+       static int oldy = 0;
+       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)
+               g.c = term.line[term.c.y][term.c.x].c;
+       
+       /* remove the old cursor */
+       if(term.line[oldy][oldx].state & GLYPH_SET)
+               xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
+       else
+               xclear(oldx, oldy, oldx, oldy);
+       
+       /* draw the new one */
+       if(mode == CURSOR_DRAW) {
+               xdraws(&g.c, g, term.c.x, term.c.y, 1);
+               oldx = term.c.x, oldy = term.c.y;
+       }
+}
+
+#ifdef DEBUG
+/* basic drawing routines */
+void
+xdrawc(int x, int y, Glyph g) {
+       XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
+       XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
+       XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
+       XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
+       XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
+}
+
+void
+draw(int dummy) {
+       int x, y;
+
+       xclear(0, 0, term.col-1, term.row-1);
+       for(y = 0; y < term.row; y++)
+               for(x = 0; x < term.col; x++)
+                       if(term.line[y][x].state & GLYPH_SET)
+                               xdrawc(x, y, term.line[y][x]);
+
+       if(!term.hidec)
+               xcursor(CURSOR_DRAW);
+       XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
+       XFlush(xw.dis);
+}
+
+#else
+/* optimized drawing routine */
+void
+draw(int redraw_all) {
+       int i, x, y, ox;
+       Glyph base, new;
+       char buf[DRAW_BUF_SIZ];
+       
+       XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
+       XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
+       for(y = 0; y < term.row; y++) {
+               base = term.line[y][0];
+               i = ox = 0;
+               for(x = 0; x < term.col; x++) {
+                       new = term.line[y][x];
+                       if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
+                               buf[i++] = new.c;
+                       else {
+                               xdraws(buf, base, ox, y, i);
+                               buf[0] = new.c;
+                               i = 1;
+                               ox = x;
+                               base = new;
+                       }
+               }
+               xdraws(buf, base, ox, y, i);
+       }
+       xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
+       XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
+       XFlush(xw.dis);
+}
+
+#endif
+
+void
+expose(XEvent *ev) {
+       draw(SCREEN_REDRAW);
+}
+
+char*
+kmap(KeySym k) {
+       int i;
+       for(i = 0; i < LEN(key); i++)
+               if(key[i].k == k)
+                       return (char*)key[i].s;
+       return NULL;
+}
+
+void
+kpress(XEvent *ev) {
+       XKeyEvent *e = &ev->xkey;
+       KeySym ksym;
+       char buf[32];
+       char *customkey;
+       int len;
+       int meta;
+       int shift;
+
+       meta = e->state & Mod1Mask;
+       shift = e->state & ShiftMask;
+       len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
+
+       if((customkey = kmap(ksym)))
+               ttywrite(customkey, strlen(customkey));
+       else if(len > 0) {
+               buf[sizeof(buf)-1] = '\0';
+               if(meta && len == 1)
+                       ttywrite("\033", 1);
+               ttywrite(buf, len);
+       } else
+               switch(ksym) {
+               case XK_Up:
+               case XK_Down:
+               case XK_Left:
+               case XK_Right:
+                       sprintf(buf, "\033%c%c", term.mode & MODE_APPKEYPAD ? 'O' : '[', "DACB"[ksym - XK_Left]);
+                       ttywrite(buf, 3);
+                       break;
+               case XK_Insert:
+                       if(shift)
+                               draw(1), puts("draw!")/* XXX: paste X clipboard */;
+                       break;
+               default:
+                       fprintf(stderr, "errkey: %d\n", (int)ksym);
+                       break;
+               }
+}
+
+void
+resize(XEvent *e) {
+       int col, row;
+       
+       if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
+               return;
+       
+       xw.w = e->xconfigure.width;
+       xw.h = e->xconfigure.height;
+       xw.bufw = xw.w - 2*BORDER;
+       xw.bufh = xw.h - 2*BORDER;
+       col = xw.bufw / xw.cw;
+       row = xw.bufh / xw.ch;
+       tresize(col, row);
+       ttyresize(col, row);
+       XFreePixmap(xw.dis, xw.buf);
+       xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
+       draw(SCREEN_REDRAW);
+}
+
+void
+run(void) {
+       XEvent ev;
+       fd_set rfd;
+       int xfd = XConnectionNumber(xw.dis);
+
+       running = 1;
+       XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
+       XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
+
+       while(running) {
+               FD_ZERO(&rfd);
+               FD_SET(cmdfd, &rfd);
+               FD_SET(xfd, &rfd);
+               if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
+                       if(errno == EINTR)
+                               continue;
+                       die("select failed: %s\n", SERRNO);
+               }
+               if(FD_ISSET(cmdfd, &rfd)) {
+                       ttyread();
+                       draw(SCREEN_UPDATE); 
+               }
+               while(XPending(xw.dis)) {
+                       XNextEvent(xw.dis, &ev);
+                       if(handler[ev.type])
+                               (handler[ev.type])(&ev);
+               }
+       }
+}
+
+int
+main(int argc, char *argv[]) {
+       if(argc == 2 && !strncmp("-v", argv[1], 3))
+               die("st-" VERSION ", © 2009 st engineers\n");
+       else if(argc != 1)
+               die("usage: st [-v]\n");
+       setlocale(LC_CTYPE, "");
+       tnew(80, 24);
+       ttynew();
+       xinit();
+       run();

        return 0;
 }
        return 0;
 }