+}
+
+void
+ttynew(void) {
+ int m, s;
+
+ /* seems to work fine on linux, openbsd and freebsd */
+ struct winsize w = {term.row, term.col, 0, 0};
+ if(openpty(&m, &s, NULL, NULL, &w) < 0)
+ die("openpty failed: %s\n", SERRNO);
+
+ 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 TIOCSCTTY failed: %s\n", SERRNO);
+ close(s);
+ close(m);
+ 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) {
+ 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;
+
+ /* 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);
+
+ /* 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);
+ ptr += charsize;
+ buflen -= charsize;
+ }
+
+ /* keep any uncomplete utf8 char for the next call */
+ memmove(buf, ptr, buflen);
+}
+
+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 = (TCursor){{
+ .mode = ATTR_NULL,
+ .fg = DefaultFG,
+ .bg = DefaultBG
+ }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
+
+ 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) {
+ /* set screen size */
+ term.row = row, term.col = col;
+ term.line = malloc(term.row * sizeof(Line));
+ term.alt = malloc(term.row * sizeof(Line));
+ for(row = 0; row < term.row; row++) {
+ term.line[row] = malloc(term.col * sizeof(Glyph));
+ term.alt [row] = malloc(term.col * sizeof(Glyph));
+ }
+ /* setup screen */
+ treset();
+}
+
+void
+tswapscreen(void) {
+ Line* tmp = term.line;
+ term.line = term.alt;
+ term.alt = tmp;
+ term.mode ^= MODE_ALTSCREEN;
+}
+
+void
+tscrolldown(int orig, int n) {
+ int i;
+ Line temp;
+
+ LIMIT(n, 0, term.bot-orig+1);
+
+ tclearregion(0, term.bot-n+1, term.col-1, term.bot);
+
+ for(i = term.bot; i >= orig+n; i--) {
+ temp = term.line[i];
+ term.line[i] = term.line[i-n];
+ term.line[i-n] = temp;
+ }
+}
+
+void
+tscrollup(int orig, int n) {
+ int i;
+ Line temp;
+ LIMIT(n, 0, term.bot-orig+1);
+
+ tclearregion(0, orig, term.col-1, orig+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;
+ }
+}
+
+void
+tnewline(int first_col) {
+ int y = term.c.y;
+ if(y == term.bot)
+ tscrollup(term.top, 1);
+ else
+ y++;
+ tmoveto(first_col ? 0 : term.c.x, 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) {
+ LIMIT(x, 0, term.col-1);
+ LIMIT(y, 0, term.row-1);
+ term.c.state &= ~CURSOR_WRAPNEXT;
+ term.c.x = x;
+ term.c.y = y;
+}
+
+void
+tsetchar(char *c) {
+ term.line[term.c.y][term.c.x] = term.c.attr;
+ memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
+ term.line[term.c.y][term.c.x].state |= GLYPH_SET;
+}
+
+void
+tclearregion(int x1, int y1, int x2, int y2) {
+ int x, 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++)
+ for(x = x1; x <= x2; x++)
+ term.line[y][x].state = 0;
+}
+
+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) {
+ if(term.c.y < term.top || term.c.y > term.bot)
+ return;
+
+ tscrolldown(term.c.y, n);
+}
+
+void
+tdeleteline(int n) {
+ if(term.c.y < term.top || term.c.y > term.bot)
+ return;
+
+ tscrollup(term.c.y, n);
+}
+
+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]), csidump();
+
+ 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:
+ fprintf(stderr, "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.c.y);
+ if(term.c.y < term.row-1)
+ tclearregion(0, term.c.y+1, term.col-1, term.row-1);
+ break;
+ case 1: /* above */
+ 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;
+ case 2: /* all */
+ tclearregion(0, 0, term.col-1, term.row-1);
+ break;
+ 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(term.top, escseq.arg[0]);
+ break;
+ case 'T': /* SD -- Scroll <n> line down */
+ DEFAULT(escseq.arg[0], 1);
+ tscrolldown(term.top, 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 5: /* DECSCNM -- Remove reverse video */
+ if(IS_SET(MODE_REVERSE)) {
+ term.mode &= ~MODE_REVERSE;
+ draw();
+ }
+ break;
+ case 7:
+ term.mode &= ~MODE_WRAP;
+ break;
+ case 12: /* att610 -- Stop blinking cursor (IGNORED) */
+ break;
+ case 20:
+ term.mode &= ~MODE_CRLF;
+ break;
+ case 25:
+ term.c.state |= CURSOR_HIDE;
+ break;
+ case 1000: /* disable X11 xterm mouse reporting */
+ term.mode &= ~MODE_MOUSEBTN;
+ break;
+ case 1002:
+ term.mode &= ~MODE_MOUSEMOTION;
+ break;
+ case 1049: /* = 1047 and 1048 */
+ case 47:
+ case 1047:
+ if(IS_SET(MODE_ALTSCREEN)) {
+ tclearregion(0, 0, term.col-1, term.row-1);
+ tswapscreen();
+ }
+ if(escseq.arg[0] != 1049)
+ break;
+ case 1048:
+ tcursor(CURSOR_LOAD);
+ 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 5: /* DECSCNM -- Reverve video */
+ if(!IS_SET(MODE_REVERSE)) {
+ term.mode |= MODE_REVERSE;
+ draw();
+ }
+ break;
+ case 7:
+ term.mode |= MODE_WRAP;
+ break;
+ case 20:
+ term.mode |= MODE_CRLF;
+ break;
+ case 12: /* att610 -- Start blinking cursor (IGNORED) */
+ /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
+ if(escseq.narg > 1 && escseq.arg[1] != 25)
+ break;
+ case 25:
+ term.c.state &= ~CURSOR_HIDE;
+ break;
+ case 1000: /* 1000,1002: enable xterm mouse report */
+ term.mode |= MODE_MOUSEBTN;
+ break;
+ case 1002:
+ term.mode |= MODE_MOUSEMOTION;
+ break;
+ case 1049: /* = 1047 and 1048 */
+ case 47:
+ case 1047:
+ if(IS_SET(MODE_ALTSCREEN))
+ tclearregion(0, 0, term.col-1, term.row-1);
+ else
+ tswapscreen();
+ if(escseq.arg[0] != 1049)
+ break;
+ case 1048:
+ tcursor(CURSOR_SAVE);
+ 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);
+ tmoveto(0, 0);
+ }
+ 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;
+ tmoveto(term.c.x + space, term.c.y);
+}
+
+void
+tputc(char *c) {
+ char ascii = *c;
+ if(term.esc & ESC_START) {
+ if(term.esc & ESC_CSI) {
+ escseq.buf[escseq.len++] = ascii;
+ if(BETWEEN(ascii, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
+ term.esc = 0;
+ csiparse(), csihandle();
+ }
+ /* TODO: handle other OSC */
+ } else if(term.esc & ESC_OSC) {
+ if(ascii == ';') {
+ term.titlelen = 0;
+ term.esc = ESC_START | ESC_TITLE;
+ }
+ } else if(term.esc & ESC_TITLE) {
+ if(ascii == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
+ term.esc = 0;
+ term.title[term.titlelen] = '\0';
+ XStoreName(xw.dpy, xw.win, term.title);
+ } else {
+ term.title[term.titlelen++] = ascii;
+ }
+ } else if(term.esc & ESC_ALTCHARSET) {
+ switch(ascii) {
+ 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:
+ fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
+ }
+ term.esc = 0;
+ } else {
+ switch(ascii) {
+ case '[':
+ term.esc |= ESC_CSI;
+ break;
+ case ']':
+ term.esc |= ESC_OSC;
+ break;
+ case '(':
+ term.esc |= ESC_ALTCHARSET;
+ 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 '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 'c': /* RIS -- Reset to inital state */
+ treset();
+ term.esc = 0;
+ 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;
+ break;
+ default:
+ fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
+ (unsigned char) ascii, isprint(ascii)?ascii:'.');
+ term.esc = 0;
+ }
+ }
+ } else {
+ switch(ascii) {
+ case '\t':
+ tputtab();
+ break;
+ case '\b':
+ tmoveto(term.c.x-1, term.c.y);
+ break;
+ case '\r':
+ tmoveto(0, term.c.y);
+ break;
+ case '\f':
+ case '\v':
+ case '\n':
+ /* go to first col if the mode is set */
+ tnewline(IS_SET(MODE_CRLF));
+ break;
+ case '\a':
+ if(!(xw.state & WIN_FOCUSED))
+ xseturgency(1);
+ break;
+ case '\033':
+ csireset();
+ term.esc = ESC_START;
+ break;
+ default:
+ if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
+ tnewline(1); /* always go to first col */
+ tsetchar(c);
+ if(term.c.x+1 < term.col)
+ tmoveto(term.c.x+1, term.c.y);
+ else
+ term.c.state |= CURSOR_WRAPNEXT;
+ }
+ }
+}
+
+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;
+
+ 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 = realloc(term.line, row * sizeof(Line));
+ term.alt = realloc(term.alt, row * sizeof(Line));
+
+ /* resize each row to new width, zero-pad if needed */
+ for(i = 0; i < minrow; i++) {
+ term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
+ term.alt[i] = realloc(term.alt[i], col * sizeof(Glyph));
+ for(x = mincol; x < col; x++) {
+ term.line[i][x].state = 0;
+ term.alt[i][x].state = 0;
+ }
+ }
+
+ /* allocate any new rows */
+ for(/* i == minrow */; i < row; i++) {
+ term.line[i] = calloc(col, sizeof(Glyph));
+ term.alt [i] = calloc(col, sizeof(Glyph));