1 /* See LICENSE for licence details. */
2 #define _XOPEN_SOURCE 600
12 #include <sys/ioctl.h>
13 #include <sys/select.h>
15 #include <sys/types.h>
19 #include <X11/keysym.h>
20 #include <X11/Xutil.h>
28 #define SERRNO strerror(errno)
29 #define MIN(a, b) ((a) < (b) ? (a) : (b))
30 #define MAX(a, b) ((a) < (b) ? (b) : (a))
31 #define LEN(a) (sizeof(a) / sizeof(a[0]))
32 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
33 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
34 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
36 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
37 enum { ATnone=0 , ATreverse=1 , ATunderline=2, ATbold=4 };
38 enum { CSup, CSdown, CSright, CSleft, CShide, CSdraw, CSwrap, CSsave, CSload };
39 enum { CRset=1, CRupdate=2 };
40 enum { TMwrap=1, TMinsert=2 };
41 enum { SCupdate, SCredraw };
46 char c; /* character code */
47 char mode; /* attribute flags */
48 Color fg; /* foreground */
49 Color bg; /* background */
50 char state; /* state flag */
56 Glyph attr; /* current char attributes */
62 /* Escape sequence structs */
63 /* ESC <pre> [[ [<priv>] <arg> [;]] <mode>] */
65 char buf[ESCSIZ+1]; /* raw string */
66 int len; /* raw string length */
70 int narg; /* nb of args */
74 /* Internal representation of the screen */
78 Line* line; /* screen */
79 TCursor c; /* cursor */
80 int top; /* top scroll limit */
81 int bot; /* bottom scroll limit */
82 int mode; /* terminal mode */
85 /* Purely graphic info */
90 int w; /* window width */
91 int h; /* window height */
92 int ch; /* char height */
93 int cw; /* char width */
103 /* Drawing Context */
105 unsigned long col[LEN(colorname)];
110 static void die(const char *errstr, ...);
111 static void draw(int);
112 static void execsh(void);
113 static void sigchld(int);
114 static void run(void);
116 static int escaddc(char);
117 static int escfinal(char);
118 static void escdump(void);
119 static void eschandle(void);
120 static void escparse(void);
121 static void escreset(void);
123 static void tclearregion(int, int, int, int);
124 static void tcpos(int);
125 static void tcursor(int);
126 static void tdeletechar(int);
127 static void tdeleteline(int);
128 static void tinsertblank(int);
129 static void tinsertblankline(int);
130 static void tmoveto(int, int);
131 static void tnew(int, int);
132 static void tnewline(void);
133 static void tputc(char);
134 static void tputs(char*, int);
135 static void tresize(int, int);
136 static void tscroll(void);
137 static void tsetattr(int*, int);
138 static void tsetchar(char);
139 static void tsetscroll(int, int);
141 static void ttynew(void);
142 static void ttyread(void);
143 static void ttyresize(int, int);
144 static void ttywrite(const char *, size_t);
146 static unsigned long xgetcol(const char *);
147 static void xclear(int, int, int, int);
148 static void xcursor(int);
149 static void xdrawc(int, int, Glyph);
150 static void xinit(void);
151 static void xscroll(void);
153 static void expose(XEvent *);
154 static char * kmap(KeySym);
155 static void kpress(XEvent *);
156 static void resize(XEvent *);
158 static void (*handler[LASTEvent])(XEvent *) = {
161 [ConfigureNotify] = resize
168 static Escseq escseq;
179 for(row = 0; row < term.row; row++) {
180 for(col = 0; col < term.col; col++) {
181 if(col == term.c.x && row == term.c.y)
184 c = term.line[row][col];
185 putchar(c.state & CRset ? c.c : '.');
194 die(const char *errstr, ...) {
197 va_start(ap, errstr);
198 vfprintf(stderr, errstr, ap);
205 char *args[3] = {SHELL, "-i", NULL};
206 putenv("TERM=" TNAME);
211 xbell(void) { /* visual bell */
212 XRectangle r = { 0, 0, xw.w, xw.h };
213 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
214 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
222 if(waitpid(pid, &stat, 0) < 0)
223 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
225 exit(WEXITSTATUS(stat));
235 if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
236 die("openpt failed: %s\n", SERRNO);
238 die("grandpt failed: %s\n", SERRNO);
240 die("unlockpt failed: %s\n", SERRNO);
241 if(!(pts = ptsname(m)))
242 die("ptsname failed: %s\n", SERRNO);
243 if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
244 die("Couldn't open slave: %s\n", SERRNO);
245 fcntl(s, F_SETFL, O_NDELAY);
246 switch(pid = fork()) {
248 die("fork failed\n");
251 setsid(); /* create a new process group */
252 dup2(s, STDIN_FILENO);
253 dup2(s, STDOUT_FILENO);
254 dup2(s, STDERR_FILENO);
255 if(ioctl(s, TIOCSCTTY, NULL) < 0)
256 die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
262 signal(SIGCHLD, sigchld);
269 fprintf(stderr, " %02x %c ", c, isprint(c)?c:'.');
271 fprintf(stderr, "\n");
276 char buf[BUFSIZ] = {0};
279 switch(ret = read(cmdfd, buf, BUFSIZ)) {
281 die("Couldn't read from shell: %s\n", SERRNO);
289 ttywrite(const char *s, size_t n) {
290 if(write(cmdfd, s, n) == -1)
291 die("write error on tty: %s\n", SERRNO);
295 ttyresize(int x, int y) {
300 w.ws_xpixel = w.ws_ypixel = 0;
301 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
302 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
318 else if(BETWEEN(c, 0x40, 0x7E))
329 x = term.c.x, y = term.c.y;
330 else if(mode == CSload)
335 tnew(int col, int row) { /* screen size */
336 term.row = row, term.col = col;
337 term.top = 0, term.bot = term.row - 1;
341 term.c.attr.mode = ATnone;
342 term.c.attr.fg = DefaultFG;
343 term.c.attr.bg = DefaultBG;
344 term.c.x = term.c.y = 0;
346 /* allocate screen */
347 term.line = calloc(term.row, sizeof(Line));
348 for(row = 0 ; row < term.row; row++)
349 term.line[row] = calloc(term.col, sizeof(Glyph));
354 Line temp = term.line[term.top];
356 /* X stuff _before_ the line swapping (results in wrong line index) */
358 for(i = term.top; i < term.bot; i++)
359 term.line[i] = term.line[i+1];
360 memset(temp, 0, sizeof(Glyph) * term.col);
361 term.line[term.bot] = temp;
366 int y = term.c.y + 1;
368 tscroll(), y = term.bot;
374 escseq.buf[escseq.len++] = c;
375 if(escfinal(c) || escseq.len >= ESCSIZ) {
376 escparse(), eschandle();
385 char *p = escseq.buf;
388 switch(escseq.pre = *p++) {
391 escseq.priv = 1, p++;
393 while(p < escseq.buf+escseq.len) {
395 escseq.arg[escseq.narg] *= 10;
396 escseq.arg[escseq.narg] += *(p++) - '0'/*, noarg = 0 */;
408 /* XXX: graphic character set */
414 tmoveto(int x, int y) {
415 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
416 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
421 int xf = term.c.x, yf = term.c.y;
433 xf = term.col-1, yf--;
435 yf = term.top, xf = 0;
443 yf = term.bot, tscroll();
452 term.line[term.c.y][term.c.x] = term.c.attr;
453 term.line[term.c.y][term.c.x].c = c;
454 term.line[term.c.y][term.c.x].state |= CRset | CRupdate;
458 tclearregion(int x1, int y1, int x2, int y2) {
461 LIMIT(x1, 0, term.col-1);
462 LIMIT(x2, 0, term.col-1);
463 LIMIT(y1, 0, term.row-1);
464 LIMIT(y2, 0, term.row-1);
466 /* XXX: could be optimized */
467 for(x = x1; x <= x2; x++)
468 for(y = y1; y <= y2; y++)
469 memset(&term.line[y][x], 0, sizeof(Glyph));
471 xclear(x1, y1, x2, y2);
476 int src = term.c.x + n;
478 int size = term.col - src;
480 if(src >= term.col) {
481 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
484 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
485 tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
489 tinsertblank(int n) {
492 int size = term.col - n - src;
494 if(dst >= term.col) {
495 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
498 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
499 tclearregion(src, term.c.y, dst, term.c.y);
503 tsetlinestate(int n, int state) {
505 for(i = 0; i < term.col; i++)
506 term.line[n][i].state |= state;
510 tinsertblankline (int n) {
515 if(term.c.y > term.bot)
517 else if(term.c.y < term.top)
519 if(term.c.y + n >= bot) {
520 tclearregion(0, term.c.y, term.col-1, bot);
523 for(i = bot; i >= term.c.y+n; i--) {
524 /* swap deleted line <-> blanked line */
525 blank = term.line[i];
526 term.line[i] = term.line[i-n];
527 term.line[i-n] = blank;
529 memset(blank, 0, term.col * sizeof(Glyph));
530 tsetlinestate(i, CRupdate);
531 tsetlinestate(i-n, CRupdate);
541 if(term.c.y > term.bot)
543 else if(term.c.y < term.top)
545 if(term.c.y + n >= bot) {
546 tclearregion(0, term.c.y, term.col-1, bot);
549 for(i = term.c.y; i <= bot-n; i++) {
550 /* swap deleted line <-> blanked line */
551 blank = term.line[i];
552 term.line[i] = term.line[i+n];
553 term.line[i+n] = blank;
555 memset(blank, 0, term.col * sizeof(Glyph));
556 tsetlinestate(i, CRupdate);
557 tsetlinestate(i-n, CRupdate);
562 tsetattr(int *attr, int l) {
565 for(i = 0; i < l; i++) {
568 memset(&term.c.attr, 0, sizeof(term.c.attr));
569 term.c.attr.fg = DefaultFG;
570 term.c.attr.bg = DefaultBG;
573 term.c.attr.mode |= ATbold;
576 term.c.attr.mode |= ATunderline;
579 term.c.attr.mode |= ATreverse;
582 term.c.hidden = CShide;
585 term.c.attr.mode &= ~ATbold;
588 term.c.attr.mode &= ~ATunderline;
591 term.c.attr.mode &= ~ATreverse;
594 term.c.attr.fg = DefaultFG;
597 term.c.attr.fg = DefaultBG;
600 if(BETWEEN(attr[i], 30, 37))
601 term.c.attr.fg = attr[i] - 30;
602 else if(BETWEEN(attr[i], 40, 47))
603 term.c.attr.bg = attr[i] - 40;
610 tsetscroll(int t, int b) {
613 LIMIT(t, 0, term.row-1);
614 LIMIT(b, 0, term.row-1);
630 switch(escseq.mode) {
633 fprintf(stderr, "erresc: unknown sequence\n");
636 case '@': /* Insert <n> blank char */
637 DEFAULT(escseq.arg[0], 1);
638 tinsertblank(escseq.arg[0]);
640 case 'A': /* Cursor <n> Up */
642 DEFAULT(escseq.arg[0], 1);
643 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
645 case 'B': /* Cursor <n> Down */
646 DEFAULT(escseq.arg[0], 1);
647 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
649 case 'C': /* Cursor <n> Forward */
651 DEFAULT(escseq.arg[0], 1);
652 tmoveto(term.c.x+escseq.arg[0], term.c.y);
654 case 'D': /* Cursor <n> Backward */
655 DEFAULT(escseq.arg[0], 1);
656 tmoveto(term.c.x-escseq.arg[0], term.c.y);
658 case 'E': /* Cursor <n> Down and first col */
659 DEFAULT(escseq.arg[0], 1);
660 tmoveto(0, term.c.y+escseq.arg[0]);
662 case 'F': /* Cursor <n> Up and first col */
663 DEFAULT(escseq.arg[0], 1);
664 tmoveto(0, term.c.y-escseq.arg[0]);
666 case 'G': /* Move to <col> */
668 DEFAULT(escseq.arg[0], 1);
669 tmoveto(escseq.arg[0]-1, term.c.y);
671 case 'H': /* Move to <row> <col> */
673 DEFAULT(escseq.arg[0], 1);
674 DEFAULT(escseq.arg[1], 1);
675 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
677 case 'J': /* Clear screen */
678 switch(escseq.arg[0]) {
680 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
683 tclearregion(0, 0, term.c.x, term.c.y);
686 tclearregion(0, 0, term.col-1, term.row-1);
690 case 'K': /* Clear line */
691 switch(escseq.arg[0]) {
693 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
696 tclearregion(0, term.c.y, term.c.x, term.c.y);
699 tclearregion(0, term.c.y, term.col-1, term.c.y);
703 case 'L': /* Insert <n> blank lines */
704 DEFAULT(escseq.arg[0], 1);
705 tinsertblankline(escseq.arg[0]);
708 if(escseq.priv && escseq.arg[0] == 25)
711 case 'M': /* Delete <n> lines */
712 DEFAULT(escseq.arg[0], 1);
713 tdeleteline(escseq.arg[0]);
715 case 'P': /* Delete <n> char */
716 DEFAULT(escseq.arg[0], 1);
717 tdeletechar(escseq.arg[0]);
719 case 'd': /* Move to <row> */
720 DEFAULT(escseq.arg[0], 1);
721 tmoveto(term.c.x, escseq.arg[0]-1);
723 case 'h': /* Set terminal mode */
724 if(escseq.priv && escseq.arg[0] == 25)
727 case 'm': /* Terminal attribute (color) */
728 tsetattr(escseq.arg, escseq.narg);
734 DEFAULT(escseq.arg[0], 1);
735 DEFAULT(escseq.arg[1], term.row);
736 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
739 case 's': /* Save cursor position */
742 case 'u': /* Load cursor position */
753 printf("rawbuf : %s\n", escseq.buf);
754 printf("prechar : %c\n", escseq.pre);
755 printf("private : %c\n", escseq.priv ? '?' : ' ');
756 printf("narg : %d\n", escseq.narg);
758 for(i = 0; i < escseq.narg; i++)
759 printf("\targ %d = %d\n", i, escseq.arg[i]);
760 printf("mode : %c\n", escseq.mode);
765 memset(&escseq, 0, sizeof(escseq));
770 int space = TAB - term.c.x % TAB;
772 if(term.c.x + space >= term.col)
775 for(; space > 0; space--)
781 static int inesc = 0;
785 /* start of escseq */
787 escreset(), inesc = 1;
803 tmoveto(0, term.c.y);
815 tputs(char *s, int len) {
816 for(; len > 0; len--)
821 tresize(int col, int row) {
824 int minrow = MIN(row, term.row);
825 int mincol = MIN(col, term.col);
827 if(col < 1 || row < 1)
830 line = calloc(row, sizeof(Line));
831 for(i = 0 ; i < row; i++)
832 line[i] = calloc(col, sizeof(Glyph));
834 for(i = 0 ; i < minrow; i++)
835 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
837 for(i = 0; i < term.row; i++)
841 LIMIT(term.c.x, 0, col-1);
842 LIMIT(term.c.y, 0, row-1);
843 LIMIT(term.top, 0, row-1);
844 LIMIT(term.bot, 0, row-1);
848 term.col = col, term.row = row;
852 xgetcol(const char *s) {
854 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
856 if(!XAllocNamedColor(xw.dis, cmap, s, &color, &color)) {
857 color.pixel = WhitePixel(xw.dis, xw.scr);
858 fprintf(stderr, "Could not allocate color '%s'\n", s);
864 xclear(int x1, int y1, int x2, int y2) {
865 XClearArea(xw.dis, xw.win,
866 x1 * xw.cw, y1 * xw.ch,
867 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch,
873 int srcy = (term.top+1) * xw.ch;
874 int dsty = term.top * xw.ch;
875 int height = (term.bot-term.top) * xw.ch;
878 XCopyArea(xw.dis, xw.win, xw.win, dc.gc, 0, srcy, xw.w, height, 0, dsty);
879 xclear(0, term.bot, term.col-1, term.bot);
885 unsigned long valuemask;
889 char *args[] = {NULL};
892 xw.dis = XOpenDisplay(NULL);
893 xw.scr = XDefaultScreen(xw.dis);
895 die("Can't open display\n");
898 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)))
899 die("Can't load font %s\n", FONT);
901 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
902 xw.ch = dc.font->ascent + dc.font->descent + LINESPACE;
905 for(i = 0; i < LEN(colorname); i++)
906 dc.col[i] = xgetcol(colorname[i]);
908 term.c.attr.fg = DefaultFG;
909 term.c.attr.bg = DefaultBG;
910 term.c.attr.mode = ATnone;
912 xw.h = term.row * xw.ch;
913 xw.w = term.col * xw.cw;
914 /* XXX: this BORDER is useless after the first resize, handle it in xdraws() */
915 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
920 values.foreground = XWhitePixel(xw.dis, xw.scr);
921 values.font = dc.font->fid;
922 valuemask = GCForeground | GCFont;
923 dc.gc = XCreateGC(xw.dis, xw.win, valuemask, &values);
924 XMapWindow(xw.dis, xw.win);
926 chint.res_name = TNAME, chint.res_class = TNAME;
927 wmhint.input = 1, wmhint.flags = InputHint;
928 shint.height_inc = xw.ch, shint.width_inc = xw.cw;
929 shint.height = xw.h, shint.width = xw.w;
930 shint.flags = PSize | PResizeInc;
931 XSetWMProperties(xw.dis, xw.win, NULL, NULL, &args[0], 0, &shint, &wmhint, &chint);
932 XStoreName(xw.dis, xw.win, TNAME);
937 xdrawc(int x, int y, Glyph g) {
938 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
939 unsigned long xfg, xbg;
942 if(g.mode & ATreverse)
943 xfg = dc.col[g.bg], xbg = dc.col[g.fg];
945 xfg = dc.col[g.fg], xbg = dc.col[g.bg];
947 XSetForeground(xw.dis, dc.gc, xbg);
948 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
950 XSetForeground(xw.dis, dc.gc, xfg);
951 XDrawString(xw.dis, xw.win, dc.gc, r.x, r.y+dc.font->ascent, &(g.c), 1);
952 if(g.mode & ATbold) /* XXX: bold hack (draw again at x+1) */
953 XDrawString(xw.dis, xw.win, dc.gc, r.x+1, r.y+dc.font->ascent, &(g.c), 1);
955 if(g.mode & ATunderline) {
956 r.y += dc.font->ascent + 1;
957 XDrawLine(xw.dis, xw.win, dc.gc, r.x, r.y, r.x+r.width-1, r.y);
965 Glyph g = {' ', ATnone, DefaultBG, DefaultCS, 0};
967 LIMIT(oldx, 0, term.col-1);
968 LIMIT(oldy, 0, term.row-1);
970 if(term.line[term.c.y][term.c.x].state & CRset)
971 g.c = term.line[term.c.y][term.c.x].c;
972 /* remove the old cursor */
973 if(term.line[oldy][oldx].state & CRset)
974 xdrawc(oldx, oldy, term.line[oldy][oldx]);
976 xclear(oldx, oldy, oldx, oldy);
977 /* draw the new one */
979 xdrawc(term.c.x, term.c.y, g);
980 oldx = term.c.x, oldy = term.c.y;
985 draw(int redraw_all) {
990 XClearWindow(xw.dis, xw.win);
992 /* XXX: drawing could be optimised */
993 for(y = 0; y < term.row; y++) {
994 for(x = 0; x < term.col; x++) {
995 changed = term.line[y][x].state & CRupdate;
996 set = term.line[y][x].state & CRset;
997 if(redraw_all || changed) {
998 term.line[y][x].state &= ~CRupdate;
1000 xdrawc(x, y, term.line[y][x]);
1010 expose(XEvent *ev) {
1017 for(i = 0; i < LEN(key); i++)
1019 return (char*)key[i].s;
1024 kpress(XEvent *ev) {
1025 XKeyEvent *e = &ev->xkey;
1033 meta = e->state & Mod1Mask;
1034 shift = e->state & ShiftMask;
1035 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1037 if(customkey = kmap(ksym))
1038 ttywrite(customkey, strlen(customkey));
1040 buf[sizeof(buf)-1] = '\0';
1041 if(meta && len == 1)
1042 ttywrite("\033", 1);
1048 /* XXX: paste X clipboard */;
1051 fprintf(stderr, "errkey: %d\n", (int)ksym);
1059 col = e->xconfigure.width / xw.cw;
1060 row = e->xconfigure.height / xw.ch;
1062 if(term.col != col || term.row != row) {
1064 ttyresize(col, row);
1065 xw.w = e->xconfigure.width;
1066 xw.h = e->xconfigure.height;
1075 int xfd = XConnectionNumber(xw.dis);
1078 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1079 XResizeWindow(xw.dis, xw.win, xw.w , xw.h); /* fix resize bug in wmii (?) */
1083 FD_SET(cmdfd, &rfd);
1085 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1088 die("select failed: %s\n", SERRNO);
1090 if(FD_ISSET(cmdfd, &rfd)) {
1094 while(XPending(xw.dis)) {
1095 XNextEvent(xw.dis, &ev);
1096 if(handler[ev.type])
1097 (handler[ev.type])(&ev);
1103 main(int argc, char *argv[]) {
1104 if(argc == 2 && !strncmp("-v", argv[1], 3))
1105 die("st-" VERSION ", © 2009 st engineers\n");
1107 die("usage: st [-v]\n");
1108 setlocale(LC_CTYPE, "");