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 */
100 unsigned long col[LEN(colorname)];
105 static void die(const char *errstr, ...);
106 static void draw(int);
107 static void execsh(void);
108 static void sigchld(int);
109 static void run(void);
111 static int escaddc(char);
112 static int escfinal(char);
113 static void escdump(void);
114 static void eschandle(void);
115 static void escparse(void);
116 static void escreset(void);
118 static void tclearregion(int, int, int, int);
119 static void tcpos(int);
120 static void tcursor(int);
121 static void tdeletechar(int);
122 static void tdeleteline(int);
123 static void tinsertblank(int);
124 static void tinsertblankline(int);
125 static void tmoveto(int, int);
126 static void tnew(int, int);
127 static void tnewline(void);
128 static void tputc(char);
129 static void tputs(char*, int);
130 static void tresize(int, int);
131 static void tscroll(void);
132 static void tsetattr(int*, int);
133 static void tsetchar(char);
134 static void tsetscroll(int, int);
136 static void ttynew(void);
137 static void ttyread(void);
138 static void ttyresize(int, int);
139 static void ttywrite(const char *, size_t);
141 static unsigned long xgetcol(const char *);
142 static void xclear(int, int, int, int);
143 static void xcursor(int);
144 static void xdrawc(int, int, Glyph);
145 static void xinit(void);
146 static void xscroll(void);
148 static void expose(XEvent *);
149 static void kpress(XEvent *);
150 static void resize(XEvent *);
152 static void (*handler[LASTEvent])(XEvent *) = {
155 [ConfigureNotify] = resize
162 static Escseq escseq;
173 for(row = 0; row < term.row; row++) {
174 for(col = 0; col < term.col; col++) {
175 if(col == term.c.x && row == term.c.y)
178 c = term.line[row][col];
179 putchar(c.state & CRset ? c.c : '.');
188 die(const char *errstr, ...) {
191 va_start(ap, errstr);
192 vfprintf(stderr, errstr, ap);
199 char *args[3] = {SHELL, "-i", NULL};
200 putenv("TERM=" TNAME);
205 xbell(void) { /* visual bell */
206 XRectangle r = { 0, 0, xw.w, xw.h };
207 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
208 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
216 if(waitpid(pid, &stat, 0) < 0)
217 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
219 exit(WEXITSTATUS(stat));
229 if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
230 die("openpt failed: %s\n", SERRNO);
232 die("grandpt failed: %s\n", SERRNO);
234 die("unlockpt failed: %s\n", SERRNO);
235 if(!(pts = ptsname(m)))
236 die("ptsname failed: %s\n", SERRNO);
237 if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
238 die("Couldn't open slave: %s\n", SERRNO);
239 fcntl(s, F_SETFL, O_NDELAY);
240 switch(pid = fork()) {
242 die("fork failed\n");
245 setsid(); /* create a new process group */
246 dup2(s, STDIN_FILENO);
247 dup2(s, STDOUT_FILENO);
248 dup2(s, STDERR_FILENO);
249 if(ioctl(s, TIOCSCTTY, NULL) < 0)
250 die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
256 signal(SIGCHLD, sigchld);
263 fprintf(stderr, " %02x %c ", c, isprint(c)?c:'.');
265 fprintf(stderr, "\n");
270 char buf[BUFSIZ] = {0};
273 switch(ret = read(cmdfd, buf, BUFSIZ)) {
275 die("Couldn't read from shell: %s\n", SERRNO);
283 ttywrite(const char *s, size_t n) {
284 if(write(cmdfd, s, n) == -1)
285 die("write error on tty: %s\n", SERRNO);
289 ttyresize(int x, int y) {
294 w.ws_xpixel = w.ws_ypixel = 0;
295 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
296 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
312 else if(BETWEEN(c, 0x40, 0x7E))
323 x = term.c.x, y = term.c.y;
324 else if(mode == CSload)
329 tnew(int col, int row) { /* screen size */
330 term.row = row, term.col = col;
331 term.top = 0, term.bot = term.row - 1;
335 term.c.attr.mode = ATnone;
336 term.c.attr.fg = DefaultFG;
337 term.c.attr.bg = DefaultBG;
338 term.c.x = term.c.y = 0;
340 /* allocate screen */
341 term.line = calloc(term.row, sizeof(Line));
342 for(row = 0 ; row < term.row; row++)
343 term.line[row] = calloc(term.col, sizeof(Glyph));
348 Line temp = term.line[term.top];
350 /* X stuff _before_ the line swapping (results in wrong line index) */
352 for(i = term.top; i < term.bot; i++)
353 term.line[i] = term.line[i+1];
354 memset(temp, 0, sizeof(Glyph) * term.col);
355 term.line[term.bot] = temp;
360 int y = term.c.y + 1;
362 tscroll(), y = term.bot;
368 escseq.buf[escseq.len++] = c;
369 if(escfinal(c) || escseq.len >= ESCSIZ) {
370 escparse(), eschandle();
379 char *p = escseq.buf;
382 switch(escseq.pre = *p++) {
385 escseq.priv = 1, p++;
387 while(p < escseq.buf+escseq.len) {
389 escseq.arg[escseq.narg] *= 10;
390 escseq.arg[escseq.narg] += *(p++) - '0'/*, noarg = 0 */;
402 /* XXX: graphic character set */
408 tmoveto(int x, int y) {
409 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
410 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
415 int xf = term.c.x, yf = term.c.y;
427 xf = term.col-1, yf--;
429 yf = term.top, xf = 0;
437 yf = term.bot, tscroll();
446 term.line[term.c.y][term.c.x] = term.c.attr;
447 term.line[term.c.y][term.c.x].c = c;
448 term.line[term.c.y][term.c.x].state |= CRset | CRupdate;
452 tclearregion(int x1, int y1, int x2, int y2) {
455 LIMIT(x1, 0, term.col-1);
456 LIMIT(x2, 0, term.col-1);
457 LIMIT(y1, 0, term.row-1);
458 LIMIT(y2, 0, term.row-1);
460 /* XXX: could be optimized */
461 for(x = x1; x <= x2; x++)
462 for(y = y1; y <= y2; y++)
463 memset(&term.line[y][x], 0, sizeof(Glyph));
465 xclear(x1, y1, x2, y2);
470 int src = term.c.x + n;
472 int size = term.col - src;
474 if(src >= term.col) {
475 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
478 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
479 tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
483 tinsertblank(int n) {
486 int size = term.col - n - src;
488 if(dst >= term.col) {
489 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
492 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
493 tclearregion(src, term.c.y, dst, term.c.y);
497 tsetlinestate(int n, int state) {
499 for(i = 0; i < term.col; i++)
500 term.line[n][i].state |= state;
504 tinsertblankline (int n) {
509 if(term.c.y > term.bot)
511 else if(term.c.y < term.top)
513 if(term.c.y + n >= bot) {
514 tclearregion(0, term.c.y, term.col-1, bot);
517 for(i = bot; i >= term.c.y+n; i--) {
518 /* swap deleted line <-> blanked line */
519 blank = term.line[i];
520 term.line[i] = term.line[i-n];
521 term.line[i-n] = blank;
523 memset(blank, 0, term.col * sizeof(Glyph));
524 tsetlinestate(i, CRupdate);
525 tsetlinestate(i-n, CRupdate);
535 if(term.c.y > term.bot)
537 else if(term.c.y < term.top)
539 if(term.c.y + n >= bot) {
540 tclearregion(0, term.c.y, term.col-1, bot);
543 for(i = term.c.y; i <= bot-n; i++) {
544 /* swap deleted line <-> blanked line */
545 blank = term.line[i];
546 term.line[i] = term.line[i+n];
547 term.line[i+n] = blank;
549 memset(blank, 0, term.col * sizeof(Glyph));
550 tsetlinestate(i, CRupdate);
551 tsetlinestate(i-n, CRupdate);
556 tsetattr(int *attr, int l) {
559 for(i = 0; i < l; i++) {
562 memset(&term.c.attr, 0, sizeof(term.c.attr));
563 term.c.attr.fg = DefaultFG;
564 term.c.attr.bg = DefaultBG;
567 term.c.attr.mode |= ATbold;
570 term.c.attr.mode |= ATunderline;
573 term.c.attr.mode |= ATreverse;
576 term.c.hidden = CShide;
579 term.c.attr.mode &= ~ATbold;
582 term.c.attr.mode &= ~ATunderline;
585 term.c.attr.mode &= ~ATreverse;
588 term.c.attr.fg = DefaultFG;
591 term.c.attr.fg = DefaultBG;
594 if(BETWEEN(attr[i], 30, 37))
595 term.c.attr.fg = attr[i] - 30;
596 else if(BETWEEN(attr[i], 40, 47))
597 term.c.attr.bg = attr[i] - 40;
604 tsetscroll(int t, int b) {
607 LIMIT(t, 0, term.row-1);
608 LIMIT(b, 0, term.row-1);
624 switch(escseq.mode) {
627 fprintf(stderr, "erresc: unknown sequence\n");
630 case '@': /* Insert <n> blank char */
631 DEFAULT(escseq.arg[0], 1);
632 tinsertblank(escseq.arg[0]);
634 case 'A': /* Cursor <n> Up */
636 DEFAULT(escseq.arg[0], 1);
637 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
639 case 'B': /* Cursor <n> Down */
640 DEFAULT(escseq.arg[0], 1);
641 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
643 case 'C': /* Cursor <n> Forward */
645 DEFAULT(escseq.arg[0], 1);
646 tmoveto(term.c.x+escseq.arg[0], term.c.y);
648 case 'D': /* Cursor <n> Backward */
649 DEFAULT(escseq.arg[0], 1);
650 tmoveto(term.c.x-escseq.arg[0], term.c.y);
652 case 'E': /* Cursor <n> Down and first col */
653 DEFAULT(escseq.arg[0], 1);
654 tmoveto(0, term.c.y+escseq.arg[0]);
656 case 'F': /* Cursor <n> Up and first col */
657 DEFAULT(escseq.arg[0], 1);
658 tmoveto(0, term.c.y-escseq.arg[0]);
660 case 'G': /* Move to <col> */
662 DEFAULT(escseq.arg[0], 1);
663 tmoveto(escseq.arg[0]-1, term.c.y);
665 case 'H': /* Move to <row> <col> */
667 DEFAULT(escseq.arg[0], 1);
668 DEFAULT(escseq.arg[1], 1);
669 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
671 case 'J': /* Clear screen */
672 switch(escseq.arg[0]) {
674 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
677 tclearregion(0, 0, term.c.x, term.c.y);
680 tclearregion(0, 0, term.col-1, term.row-1);
684 case 'K': /* Clear line */
685 switch(escseq.arg[0]) {
687 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
690 tclearregion(0, term.c.y, term.c.x, term.c.y);
693 tclearregion(0, term.c.y, term.col-1, term.c.y);
697 case 'L': /* Insert <n> blank lines */
698 DEFAULT(escseq.arg[0], 1);
699 tinsertblankline(escseq.arg[0]);
702 if(escseq.priv && escseq.arg[0] == 25)
705 case 'M': /* Delete <n> lines */
706 DEFAULT(escseq.arg[0], 1);
707 tdeleteline(escseq.arg[0]);
709 case 'P': /* Delete <n> char */
710 DEFAULT(escseq.arg[0], 1);
711 tdeletechar(escseq.arg[0]);
713 case 'd': /* Move to <row> */
714 DEFAULT(escseq.arg[0], 1);
715 tmoveto(term.c.x, escseq.arg[0]-1);
717 case 'h': /* Set terminal mode */
718 if(escseq.priv && escseq.arg[0] == 25)
721 case 'm': /* Terminal attribute (color) */
722 tsetattr(escseq.arg, escseq.narg);
728 DEFAULT(escseq.arg[0], 1);
729 DEFAULT(escseq.arg[1], term.row);
730 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
733 case 's': /* Save cursor position */
736 case 'u': /* Load cursor position */
747 printf("rawbuf : %s\n", escseq.buf);
748 printf("prechar : %c\n", escseq.pre);
749 printf("private : %c\n", escseq.priv ? '?' : ' ');
750 printf("narg : %d\n", escseq.narg);
752 for(i = 0; i < escseq.narg; i++)
753 printf("\targ %d = %d\n", i, escseq.arg[i]);
754 printf("mode : %c\n", escseq.mode);
759 memset(&escseq, 0, sizeof(escseq));
764 int space = TAB - term.c.x % TAB;
766 if(term.c.x + space >= term.col)
769 for(; space > 0; space--)
775 static int inesc = 0;
779 /* start of escseq */
781 escreset(), inesc = 1;
797 tmoveto(0, term.c.y);
809 tputs(char *s, int len) {
810 for(; len > 0; len--)
815 tresize(int col, int row) {
818 int minrow = MIN(row, term.row);
819 int mincol = MIN(col, term.col);
821 if(col < 1 || row < 1)
824 line = calloc(row, sizeof(Line));
825 for(i = 0 ; i < row; i++)
826 line[i] = calloc(col, sizeof(Glyph));
828 for(i = 0 ; i < minrow; i++)
829 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
831 for(i = 0; i < term.row; i++)
835 LIMIT(term.c.x, 0, col-1);
836 LIMIT(term.c.y, 0, row-1);
837 LIMIT(term.top, 0, row-1);
838 LIMIT(term.bot, 0, row-1);
842 term.col = col, term.row = row;
846 xgetcol(const char *s) {
848 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
850 if(!XAllocNamedColor(xw.dis, cmap, s, &color, &color)) {
851 color.pixel = WhitePixel(xw.dis, xw.scr);
852 fprintf(stderr, "Could not allocate color '%s'\n", s);
858 xclear(int x1, int y1, int x2, int y2) {
859 XClearArea(xw.dis, xw.win,
860 x1 * xw.cw, y1 * xw.ch,
861 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch,
867 int srcy = (term.top+1) * xw.ch;
868 int dsty = term.top * xw.ch;
869 int height = (term.bot-term.top) * xw.ch;
872 XCopyArea(xw.dis, xw.win, xw.win, dc.gc, 0, srcy, xw.w, height, 0, dsty);
873 xclear(0, term.bot, term.col-1, term.bot);
879 unsigned long valuemask;
883 char *args[] = {NULL};
886 xw.dis = XOpenDisplay(NULL);
887 xw.scr = XDefaultScreen(xw.dis);
889 die("Can't open display\n");
892 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)))
893 die("Can't load font %s\n", FONT);
895 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
896 xw.ch = dc.font->ascent + dc.font->descent + LINESPACE;
899 for(i = 0; i < LEN(colorname); i++)
900 dc.col[i] = xgetcol(colorname[i]);
902 term.c.attr.fg = DefaultFG;
903 term.c.attr.bg = DefaultBG;
904 term.c.attr.mode = ATnone;
906 xw.h = term.row * xw.ch;
907 xw.w = term.col * xw.cw;
908 /* XXX: this BORDER is useless after the first resize, handle it in xdraws() */
909 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
914 values.foreground = XWhitePixel(xw.dis, xw.scr);
915 values.font = dc.font->fid;
916 valuemask = GCForeground | GCFont;
917 dc.gc = XCreateGC(xw.dis, xw.win, valuemask, &values);
918 XMapWindow(xw.dis, xw.win);
920 chint.res_name = TNAME, chint.res_class = TNAME;
921 wmhint.input = 1, wmhint.flags = InputHint;
922 shint.height_inc = xw.ch, shint.width_inc = xw.cw;
923 shint.height = xw.h, shint.width = xw.w;
924 shint.flags = PSize | PResizeInc;
925 XSetWMProperties(xw.dis, xw.win, NULL, NULL, &args[0], 0, &shint, &wmhint, &chint);
926 XStoreName(xw.dis, xw.win, TNAME);
931 xdrawc(int x, int y, Glyph g) {
932 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
933 unsigned long xfg, xbg;
936 if(g.mode & ATreverse)
937 xfg = dc.col[g.bg], xbg = dc.col[g.fg];
939 xfg = dc.col[g.fg], xbg = dc.col[g.bg];
941 XSetForeground(xw.dis, dc.gc, xbg);
942 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
944 XSetForeground(xw.dis, dc.gc, xfg);
945 XDrawString(xw.dis, xw.win, dc.gc, r.x, r.y+dc.font->ascent, &(g.c), 1);
946 if(g.mode & ATbold) /* XXX: bold hack (draw again at x+1) */
947 XDrawString(xw.dis, xw.win, dc.gc, r.x+1, r.y+dc.font->ascent, &(g.c), 1);
949 if(g.mode & ATunderline) {
950 r.y += dc.font->ascent + 1;
951 XDrawLine(xw.dis, xw.win, dc.gc, r.x, r.y, r.x+r.width-1, r.y);
959 Glyph g = {' ', ATnone, DefaultBG, DefaultCS, 0};
961 LIMIT(oldx, 0, term.col-1);
962 LIMIT(oldy, 0, term.row-1);
964 if(term.line[term.c.y][term.c.x].state & CRset)
965 g.c = term.line[term.c.y][term.c.x].c;
966 /* remove the old cursor */
967 if(term.line[oldy][oldx].state & CRset)
968 xdrawc(oldx, oldy, term.line[oldy][oldx]);
970 xclear(oldx, oldy, oldx, oldy);
971 /* draw the new one */
973 xdrawc(term.c.x, term.c.y, g);
974 oldx = term.c.x, oldy = term.c.y;
979 draw(int redraw_all) {
984 XClearWindow(xw.dis, xw.win);
986 /* XXX: drawing could be optimised */
987 for(y = 0; y < term.row; y++) {
988 for(x = 0; x < term.col; x++) {
989 changed = term.line[y][x].state & CRupdate;
990 set = term.line[y][x].state & CRset;
991 if(redraw_all || changed) {
992 term.line[y][x].state &= ~CRupdate;
994 xdrawc(x, y, term.line[y][x]);
1004 expose(XEvent *ev) {
1009 kpress(XEvent *ev) {
1010 XKeyEvent *e = &ev->xkey;
1017 meta = e->state & Mod1Mask;
1018 shift = e->state & ShiftMask;
1019 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1021 ttywrite(key[ksym], strlen(key[ksym]));
1023 buf[sizeof(buf)-1] = '\0';
1024 if(meta && len == 1)
1025 ttywrite("\033", 1);
1031 /* XXX: paste X clipboard */;
1034 fprintf(stderr, "errkey: %d\n", (int)ksym);
1042 col = e->xconfigure.width / xw.cw;
1043 row = e->xconfigure.height / xw.ch;
1045 if(term.col != col || term.row != row) {
1047 ttyresize(col, row);
1048 xw.w = e->xconfigure.width;
1049 xw.h = e->xconfigure.height;
1058 int xfd = XConnectionNumber(xw.dis);
1061 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1062 XResizeWindow(xw.dis, xw.win, xw.w , xw.h); /* fix resize bug in wmii (?) */
1066 FD_SET(cmdfd, &rfd);
1068 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1071 die("select failed: %s\n", SERRNO);
1073 if(FD_ISSET(cmdfd, &rfd)) {
1077 while(XPending(xw.dis)) {
1078 XNextEvent(xw.dis, &ev);
1079 if(handler[ev.type])
1080 (handler[ev.type])(&ev);
1086 main(int argc, char *argv[]) {
1087 if(argc == 2 && !strncmp("-v", argv[1], 3))
1088 die("st-" VERSION ", © 2009 st engineers\n");
1090 die("usage: st [-v]\n");
1091 setlocale(LC_CTYPE, "");