st.c

   1 /* See LICENSE for licence details. */
   2 #define _XOPEN_SOURCE 600
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <limits.h>
   7 #include <locale.h>
   8 #include <stdarg.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <signal.h>
  13 #include <sys/ioctl.h>
  14 #include <sys/select.h>
  15 #include <sys/stat.h>
  16 #include <sys/types.h>
  17 #include <sys/wait.h>
  18 #include <unistd.h>
  19 #include <X11/Xlib.h>
  20 #include <X11/Xatom.h>
  21 #include <X11/keysym.h>
  22 #include <X11/Xutil.h>
  23
  24 #if   defined(__linux)
  25  #include <pty.h>
  26 #elif defined(__OpenBSD__) || defined(__NetBSD__)
  27  #include <util.h>
  28 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  29  #include <libutil.h>
  30 #endif
  31
  32 #define USAGE \
  33         "st-" VERSION ", (c) 2010 st engineers\n" \
  34         "usage: st [-t title] [-e cmd] [-v]\n"
  35
  36 /* Arbitrary sizes */
  37 #define ESC_TITLE_SIZ 256
  38 #define ESC_BUF_SIZ   256
  39 #define ESC_ARG_SIZ   16
  40 #define DRAW_BUF_SIZ  1024
  41
  42 #define SERRNO strerror(errno)
  43 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  44 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  45 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  46 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  47 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  48 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  49 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  50 #define IS_SET(flag) (term.mode & (flag))
  51
  52 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  53 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
  54 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
  55        CURSOR_SAVE, CURSOR_LOAD };
  56 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
  57 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  58 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8,
  59        MODE_CRLF=16 };
  60 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  61 enum { SCREEN_UPDATE, SCREEN_REDRAW };
  62 enum { WIN_VISIBLE=1, WIN_REDRAW=2, WIN_FOCUSED=4 };
  63
  64 typedef struct {
  65         char c;     /* character code  */
  66         char mode;  /* attribute flags */
  67         int fg;     /* foreground      */
  68         int bg;     /* background      */
  69         char state; /* state flags     */
  70 } Glyph;
  71
  72 typedef Glyph* Line;
  73
  74 typedef struct {
  75         Glyph attr;      /* current char attributes */
  76         int x;
  77         int y;
  78         char state;
  79 } TCursor;
  80
  81 /* CSI Escape sequence structs */
  82 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  83 typedef struct {
  84         char buf[ESC_BUF_SIZ]; /* raw string */
  85         int len;                           /* raw string length */
  86         char priv;
  87         int arg[ESC_ARG_SIZ];
  88         int narg;                          /* nb of args */
  89         char mode;
  90 } CSIEscape;
  91
  92 /* Internal representation of the screen */
  93 typedef struct {
  94         int row;        /* nb row */
  95         int col;        /* nb col */
  96         Line* line;     /* screen */
  97         Line* alt;      /* alternate screen */
  98         TCursor c;      /* cursor */
  99         int top;        /* top    scroll limit */
 100         int bot;        /* bottom scroll limit */
 101         int mode;       /* terminal mode flags */
 102         int esc;        /* escape state flags */
 103         char title[ESC_TITLE_SIZ];
 104         int titlelen;
 105 } Term;
 106
 107 /* Purely graphic info */
 108 typedef struct {
 109         Display* dis;
 110         Colormap cmap;
 111         Window win;
 112         Pixmap buf;
 113         XIM xim;
 114         XIC xic;
 115         int scr;
 116         int w;  /* window width  */
 117         int h;  /* window height */
 118         int bufw; /* pixmap width  */
 119         int bufh; /* pixmap height */
 120         int ch; /* char height */
 121         int cw; /* char width  */
 122         char state; /* focus, redraw, visible */
 123 } XWindow;
 124
 125 typedef struct {
 126         KeySym k;
 127         char s[ESC_BUF_SIZ];
 128 } Key;
 129
 130 /* Drawing Context */
 131 typedef struct {
 132         unsigned long col[256];
 133         XFontStruct* font;
 134         XFontStruct* bfont;
 135         GC gc;
 136 } DC;
 137
 138 /* TODO: use better name for vars... */
 139 typedef struct {
 140         int mode;
 141         int bx, by;
 142         int ex, ey;
 143         struct {int x, y;}  b, e;
 144         char *clip;
 145 } Selection;
 146
 147 #include "config.h"
 148
 149 static void die(const char *errstr, ...);
 150 static void draw(int);
 151 static void execsh(void);
 152 static void sigchld(int);
 153 static void run(void);
 154
 155 static void csidump(void);
 156 static void csihandle(void);
 157 static void csiparse(void);
 158 static void csireset(void);
 159
 160 static void tclearregion(int, int, int, int);
 161 static void tcursor(int);
 162 static void tdeletechar(int);
 163 static void tdeleteline(int);
 164 static void tinsertblank(int);
 165 static void tinsertblankline(int);
 166 static void tmoveto(int, int);
 167 static void tnew(int, int);
 168 static void tnewline(int);
 169 static void tputtab(void);
 170 static void tputc(char);
 171 static void tputs(char*, int);
 172 static void treset(void);
 173 static void tresize(int, int);
 174 static void tscrollup(int, int);
 175 static void tscrolldown(int, int);
 176 static void tsetattr(int*, int);
 177 static void tsetchar(char);
 178 static void tsetscroll(int, int);
 179 static void tswapscreen(void);
 180
 181 static void ttynew(void);
 182 static void ttyread(void);
 183 static void ttyresize(int, int);
 184 static void ttywrite(const char *, size_t);
 185
 186 static void xdraws(char *, Glyph, int, int, int);
 187 static void xhints(void);
 188 static void xclear(int, int, int, int);
 189 static void xdrawcursor(void);
 190 static void xinit(void);
 191 static void xloadcols(void);
 192 static void xseturgency(int);
 193 static void xresize(int, int);
 194
 195 static void expose(XEvent *);
 196 static void visibility(XEvent *);
 197 static void unmap(XEvent *);
 198 static char* kmap(KeySym);
 199 static void kpress(XEvent *);
 200 static void resize(XEvent *);
 201 static void focus(XEvent *);
 202 static void brelease(XEvent *);
 203 static void bpress(XEvent *);
 204 static void bmotion(XEvent *);
 205 static void selection_notify(XEvent *);
 206 static void selection_request(XEvent *);
 207
 208 static void (*handler[LASTEvent])(XEvent *) = {
 209         [KeyPress] = kpress,
 210         [ConfigureNotify] = resize,
 211         [VisibilityNotify] = visibility,
 212         [UnmapNotify] = unmap,
 213         [Expose] = expose,
 214         [FocusIn] = focus,
 215         [FocusOut] = focus,
 216         [MotionNotify] = bmotion,
 217         [ButtonPress] = bpress,
 218         [ButtonRelease] = brelease,
 219         [SelectionNotify] = selection_notify,
 220         [SelectionRequest] = selection_request,
 221 };
 222
 223 /* Globals */
 224 static DC dc;
 225 static XWindow xw;
 226 static Term term;
 227 static CSIEscape escseq;
 228 static int cmdfd;
 229 static pid_t pid;
 230 static Selection sel;
 231 static char *opt_cmd   = NULL;
 232 static char *opt_title = NULL;
 233
 234 void
 235 selinit(void) {
 236         sel.mode = 0;
 237         sel.bx = -1;
 238         sel.clip = NULL;
 239 }
 240
 241 static inline int selected(int x, int y) {
 242         if(sel.ey == y && sel.by == y) {
 243                 int bx = MIN(sel.bx, sel.ex);
 244                 int ex = MAX(sel.bx, sel.ex);
 245                 return BETWEEN(x, bx, ex);
 246         }
 247         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 248                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 249 }
 250
 251 static void getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 252         if(b)
 253                 *b = e->xbutton.button;
 254
 255         *x = e->xbutton.x/xw.cw;
 256         *y = e->xbutton.y/xw.ch;
 257         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 258         sel.b.y = MIN(sel.by, sel.ey);
 259         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 260         sel.e.y = MAX(sel.by, sel.ey);
 261 }
 262
 263 static void bpress(XEvent *e) {
 264         sel.mode = 1;
 265         sel.ex = sel.bx = e->xbutton.x/xw.cw;
 266         sel.ey = sel.by = e->xbutton.y/xw.ch;
 267 }
 268
 269 static char *getseltext() {
 270         char *str, *ptr;
 271         int ls, x, y, sz;
 272         if(sel.bx == -1)
 273                 return NULL;
 274         sz = (term.col+1) * (sel.e.y-sel.b.y+1);
 275         ptr = str = malloc(sz);
 276         for(y = 0; y < term.row; y++) {
 277                 for(x = 0; x < term.col; x++)
 278                         if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y)))
 279                                 *ptr = term.line[y][x].c, ptr++;
 280                 if(ls)
 281                         *ptr = '\n', ptr++;
 282         }
 283         *ptr = 0;
 284         return str;
 285 }
 286
 287 static void selection_notify(XEvent *e) {
 288         unsigned long nitems;
 289         unsigned long length;
 290         int format, res;
 291         unsigned char *data;
 292         Atom type;
 293
 294         res = XGetWindowProperty(xw.dis, xw.win, XA_PRIMARY, 0, 0, False,
 295                                 AnyPropertyType, &type, &format, &nitems, &length, &data);
 296         switch(res) {
 297                 case BadAtom:
 298                 case BadValue:
 299                 case BadWindow:
 300                         fprintf(stderr, "Invalid paste, XGetWindowProperty0");
 301                         return;
 302         }
 303
 304         res = XGetWindowProperty(xw.dis, xw.win, XA_PRIMARY, 0, length, False,
 305                                 AnyPropertyType, &type, &format, &nitems, &length, &data);
 306         switch(res) {
 307                 case BadAtom:
 308                 case BadValue:
 309                 case BadWindow:
 310                         fprintf(stderr, "Invalid paste, XGetWindowProperty0");
 311                         return;
 312         }
 313
 314         if(data) {
 315                 ttywrite((const char *) data, nitems * format / 8);
 316                 XFree(data);
 317         }
 318 }
 319
 320 static void selpaste() {
 321         XConvertSelection(xw.dis, XA_PRIMARY, XA_STRING, XA_PRIMARY, xw.win, CurrentTime);
 322 }
 323
 324 static void selection_request(XEvent *e)
 325 {
 326         XSelectionRequestEvent *xsre;
 327         XSelectionEvent xev;
 328         int res;
 329         Atom xa_targets;
 330
 331         xsre = (XSelectionRequestEvent *) e;
 332         xev.type = SelectionNotify;
 333         xev.requestor = xsre->requestor;
 334         xev.selection = xsre->selection;
 335         xev.target = xsre->target;
 336         xev.time = xsre->time;
 337         /* reject */
 338         xev.property = None;
 339
 340         xa_targets = XInternAtom(xw.dis, "TARGETS", 0);
 341         if(xsre->target == xa_targets) {
 342                 /* respond with the supported type */
 343                 Atom string = XA_STRING;
 344                 res = XChangeProperty(xsre->display, xsre->requestor, xsre->property, XA_ATOM, 32,
 345                                 PropModeReplace, (unsigned char *) &string, 1);
 346                 switch(res) {
 347                         case BadAlloc:
 348                         case BadAtom:
 349                         case BadMatch:
 350                         case BadValue:
 351                         case BadWindow:
 352                                 fprintf(stderr, "Error in selection_request, TARGETS");
 353                                 break;
 354                         default:
 355                                 xev.property = xsre->property;
 356                 }
 357         } else if(xsre->target == XA_STRING) {
 358                 res = XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 359                                 xsre->target, 8, PropModeReplace, (unsigned char *) sel.clip,
 360                                 strlen(sel.clip));
 361                 switch(res) {
 362                         case BadAlloc:
 363                         case BadAtom:
 364                         case BadMatch:
 365                         case BadValue:
 366                         case BadWindow:
 367                                 fprintf(stderr, "Error in selection_request, XA_STRING");
 368                                 break;
 369                         default:
 370                          xev.property = xsre->property;
 371                 }
 372         }
 373
 374         /* all done, send a notification to the listener */
 375         res = XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev);
 376         switch(res) {
 377                 case 0:
 378                 case BadValue:
 379                 case BadWindow:
 380                         fprintf(stderr, "Error in selection_requested, XSendEvent");
 381         }
 382 }
 383
 384 static void selcopy(char *str) {
 385         /* register the selection for both the clipboard and the primary */
 386         Atom clipboard;
 387         int res;
 388
 389         free(sel.clip);
 390         sel.clip = str;
 391
 392         res = XSetSelectionOwner(xw.dis, XA_PRIMARY, xw.win, CurrentTime);
 393         switch(res) {
 394                 case BadAtom:
 395                 case BadWindow:
 396                         fprintf(stderr, "Invalid copy, XSetSelectionOwner");
 397                         return;
 398         }
 399
 400         clipboard = XInternAtom(xw.dis, "CLIPBOARD", 0);
 401         res = XSetSelectionOwner(xw.dis, clipboard, xw.win, CurrentTime);
 402         switch(res) {
 403                 case BadAtom:
 404                 case BadWindow:
 405                         fprintf(stderr, "Invalid copy, XSetSelectionOwner");
 406                         return;
 407         }
 408
 409         XFlush(xw.dis);
 410 }
 411
 412 /* TODO: doubleclick to select word */
 413 static void brelease(XEvent *e) {
 414         int b;
 415         sel.mode = 0;
 416         getbuttoninfo(e, &b, &sel.ex, &sel.ey);
 417         if(sel.bx==sel.ex && sel.by==sel.ey) {
 418                 sel.bx = -1;
 419                 if(b==2)
 420                         selpaste();
 421         } else {
 422                 if(b==1)
 423                         selcopy(getseltext());
 424         }
 425         draw(1);
 426 }
 427
 428 static void bmotion(XEvent *e) {
 429         if (sel.mode) {
 430                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 431                 draw(1);
 432         }
 433 }
 434
 435 #ifdef DEBUG
 436 void
 437 tdump(void) {
 438         int row, col;
 439         Glyph c;
 440
 441         for(row = 0; row < term.row; row++) {
 442                 for(col = 0; col < term.col; col++) {
 443                         if(col == term.c.x && row == term.c.y)
 444                                 putchar('#');
 445                         else {
 446                                 c = term.line[row][col];
 447                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 448                         }
 449                 }
 450                 putchar('\n');
 451         }
 452 }
 453 #endif
 454
 455 void
 456 die(const char *errstr, ...) {
 457         va_list ap;
 458
 459         va_start(ap, errstr);
 460         vfprintf(stderr, errstr, ap);
 461         va_end(ap);
 462         exit(EXIT_FAILURE);
 463 }
 464
 465 void
 466 execsh(void) {
 467         char *args[] = {getenv("SHELL"), "-i", NULL};
 468         if(opt_cmd)
 469                 args[0] = opt_cmd, args[1] = NULL;
 470         else
 471                 DEFAULT(args[0], SHELL);
 472         putenv("TERM="TNAME);
 473         execvp(args[0], args);
 474 }
 475
 476 void
 477 sigchld(int a) {
 478         int stat = 0;
 479         if(waitpid(pid, &stat, 0) < 0)
 480                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 481         if(WIFEXITED(stat))
 482                 exit(WEXITSTATUS(stat));
 483         else
 484                 exit(EXIT_FAILURE);
 485 }
 486
 487 void
 488 ttynew(void) {
 489         int m, s;
 490
 491         /* seems to work fine on linux, openbsd and freebsd */
 492         struct winsize w = {term.row, term.col, 0, 0};
 493         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 494                 die("openpty failed: %s\n", SERRNO);
 495
 496         switch(pid = fork()) {
 497         case -1:
 498                 die("fork failed\n");
 499                 break;
 500         case 0:
 501                 setsid(); /* create a new process group */
 502                 dup2(s, STDIN_FILENO);
 503                 dup2(s, STDOUT_FILENO);
 504                 dup2(s, STDERR_FILENO);
 505                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 506                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 507                 close(s);
 508                 close(m);
 509                 execsh();
 510                 break;
 511         default:
 512                 close(s);
 513                 cmdfd = m;
 514                 signal(SIGCHLD, sigchld);
 515         }
 516 }
 517
 518 void
 519 dump(char c) {
 520         static int col;
 521         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 522         if(++col % 10 == 0)
 523                 fprintf(stderr, "\n");
 524 }
 525
 526 void
 527 ttyread(void) {
 528         char buf[BUFSIZ];
 529         int ret;
 530
 531         if((ret = read(cmdfd, buf, LEN(buf))) < 0)
 532                 die("Couldn't read from shell: %s\n", SERRNO);
 533         else
 534                 tputs(buf, ret);
 535 }
 536
 537 void
 538 ttywrite(const char *s, size_t n) {
 539         if(write(cmdfd, s, n) == -1)
 540                 die("write error on tty: %s\n", SERRNO);
 541 }
 542
 543 void
 544 ttyresize(int x, int y) {
 545         struct winsize w;
 546
 547         w.ws_row = term.row;
 548         w.ws_col = term.col;
 549         w.ws_xpixel = w.ws_ypixel = 0;
 550         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 551                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 552 }
 553
 554 void
 555 tcursor(int mode) {
 556         static TCursor c;
 557
 558         if(mode == CURSOR_SAVE)
 559                 c = term.c;
 560         else if(mode == CURSOR_LOAD)
 561                 term.c = c, tmoveto(c.x, c.y);
 562 }
 563
 564 void
 565 treset(void) {
 566         term.c = (TCursor){{
 567                 .mode = ATTR_NULL,
 568                 .fg = DefaultFG,
 569                 .bg = DefaultBG
 570         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 571
 572         term.top = 0, term.bot = term.row - 1;
 573         term.mode = MODE_WRAP;
 574         tclearregion(0, 0, term.col-1, term.row-1);
 575 }
 576
 577 void
 578 tnew(int col, int row) {
 579         /* set screen size */
 580         term.row = row, term.col = col;
 581         term.line = malloc(term.row * sizeof(Line));
 582         term.alt  = malloc(term.row * sizeof(Line));
 583         for(row = 0 ; row < term.row; row++) {
 584                 term.line[row] = malloc(term.col * sizeof(Glyph));
 585                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 586         }
 587         /* setup screen */
 588         treset();
 589 }
 590
 591 void
 592 tswapscreen(void) {
 593         Line* tmp = term.line;
 594         term.line = term.alt;
 595         term.alt = tmp;
 596         term.mode ^= MODE_ALTSCREEN;
 597 }
 598
 599 void
 600 tscrolldown(int orig, int n) {
 601         int i;
 602         Line temp;
 603
 604         LIMIT(n, 0, term.bot-orig+1);
 605
 606         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 607
 608         for(i = term.bot; i >= orig+n; i--) {
 609                 temp = term.line[i];
 610                 term.line[i] = term.line[i-n];
 611                 term.line[i-n] = temp;
 612         }
 613 }
 614
 615 void
 616 tscrollup(int orig, int n) {
 617         int i;
 618         Line temp;
 619         LIMIT(n, 0, term.bot-orig+1);
 620
 621         tclearregion(0, orig, term.col-1, orig+n-1);
 622
 623         for(i = orig; i <= term.bot-n; i++) {
 624                  temp = term.line[i];
 625                  term.line[i] = term.line[i+n];
 626                  term.line[i+n] = temp;
 627         }
 628 }
 629
 630 void
 631 tnewline(int first_col) {
 632         int y = term.c.y;
 633         if(y == term.bot)
 634                 tscrollup(term.top, 1);
 635         else
 636                 y++;
 637         tmoveto(first_col ? 0 : term.c.x, y);
 638 }
 639
 640 void
 641 csiparse(void) {
 642         /* int noarg = 1; */
 643         char *p = escseq.buf;
 644
 645         escseq.narg = 0;
 646         if(*p == '?')
 647                 escseq.priv = 1, p++;
 648
 649         while(p < escseq.buf+escseq.len) {
 650                 while(isdigit(*p)) {
 651                         escseq.arg[escseq.narg] *= 10;
 652                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 653                 }
 654                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 655                         escseq.narg++, p++;
 656                 else {
 657                         escseq.mode = *p;
 658                         escseq.narg++;
 659                         return;
 660                 }
 661         }
 662 }
 663
 664 void
 665 tmoveto(int x, int y) {
 666         LIMIT(x, 0, term.col-1);
 667         LIMIT(y, 0, term.row-1);
 668         term.c.state &= ~CURSOR_WRAPNEXT;
 669         term.c.x = x;
 670         term.c.y = y;
 671 }
 672
 673 void
 674 tsetchar(char c) {
 675         term.line[term.c.y][term.c.x] = term.c.attr;
 676         term.line[term.c.y][term.c.x].c = c;
 677         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 678 }
 679
 680 void
 681 tclearregion(int x1, int y1, int x2, int y2) {
 682         int x, y, temp;
 683
 684         if(x1 > x2)
 685                 temp = x1, x1 = x2, x2 = temp;
 686         if(y1 > y2)
 687                 temp = y1, y1 = y2, y2 = temp;
 688
 689         LIMIT(x1, 0, term.col-1);
 690         LIMIT(x2, 0, term.col-1);
 691         LIMIT(y1, 0, term.row-1);
 692         LIMIT(y2, 0, term.row-1);
 693
 694         for(y = y1; y <= y2; y++)
 695                 for(x = x1; x <= x2; x++)
 696                         term.line[y][x].state = 0;
 697 }
 698
 699 void
 700 tdeletechar(int n) {
 701         int src = term.c.x + n;
 702         int dst = term.c.x;
 703         int size = term.col - src;
 704
 705         if(src >= term.col) {
 706                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 707                 return;
 708         }
 709         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 710         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 711 }
 712
 713 void
 714 tinsertblank(int n) {
 715         int src = term.c.x;
 716         int dst = src + n;
 717         int size = term.col - dst;
 718
 719         if(dst >= term.col) {
 720                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 721                 return;
 722         }
 723         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 724         tclearregion(src, term.c.y, dst - 1, term.c.y);
 725 }
 726
 727 void
 728 tinsertblankline(int n) {
 729         if(term.c.y < term.top || term.c.y > term.bot)
 730                 return;
 731
 732         tscrolldown(term.c.y, n);
 733 }
 734
 735 void
 736 tdeleteline(int n) {
 737         if(term.c.y < term.top || term.c.y > term.bot)
 738                 return;
 739
 740         tscrollup(term.c.y, n);
 741 }
 742
 743 void
 744 tsetattr(int *attr, int l) {
 745         int i;
 746
 747         for(i = 0; i < l; i++) {
 748                 switch(attr[i]) {
 749                 case 0:
 750                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 751                         term.c.attr.fg = DefaultFG;
 752                         term.c.attr.bg = DefaultBG;
 753                         break;
 754                 case 1:
 755                         term.c.attr.mode |= ATTR_BOLD;
 756                         break;
 757                 case 4:
 758                         term.c.attr.mode |= ATTR_UNDERLINE;
 759                         break;
 760                 case 7:
 761                         term.c.attr.mode |= ATTR_REVERSE;
 762                         break;
 763                 case 22:
 764                         term.c.attr.mode &= ~ATTR_BOLD;
 765                         break;
 766                 case 24:
 767                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 768                         break;
 769                 case 27:
 770                         term.c.attr.mode &= ~ATTR_REVERSE;
 771                         break;
 772                 case 38:
 773                         if (i + 2 < l && attr[i + 1] == 5) {
 774                                 i += 2;
 775                                 if (BETWEEN(attr[i], 0, 255))
 776                                         term.c.attr.fg = attr[i];
 777                                 else
 778                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 779                         }
 780                         else
 781                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 782                         break;
 783                 case 39:
 784                         term.c.attr.fg = DefaultFG;
 785                         break;
 786                 case 48:
 787                         if (i + 2 < l && attr[i + 1] == 5) {
 788                                 i += 2;
 789                                 if (BETWEEN(attr[i], 0, 255))
 790                                         term.c.attr.bg = attr[i];
 791                                 else
 792                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 793                         }
 794                         else
 795                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 796                         break;
 797                 case 49:
 798                         term.c.attr.bg = DefaultBG;
 799                         break;
 800                 default:
 801                         if(BETWEEN(attr[i], 30, 37))
 802                                 term.c.attr.fg = attr[i] - 30;
 803                         else if(BETWEEN(attr[i], 40, 47))
 804                                 term.c.attr.bg = attr[i] - 40;
 805                         else if(BETWEEN(attr[i], 90, 97))
 806                                 term.c.attr.fg = attr[i] - 90 + 8;
 807                         else if(BETWEEN(attr[i], 100, 107))
 808                                 term.c.attr.fg = attr[i] - 100 + 8;
 809                         else
 810                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
 811
 812                         break;
 813                 }
 814         }
 815 }
 816
 817 void
 818 tsetscroll(int t, int b) {
 819         int temp;
 820
 821         LIMIT(t, 0, term.row-1);
 822         LIMIT(b, 0, term.row-1);
 823         if(t > b) {
 824                 temp = t;
 825                 t = b;
 826                 b = temp;
 827         }
 828         term.top = t;
 829         term.bot = b;
 830 }
 831
 832 void
 833 csihandle(void) {
 834         switch(escseq.mode) {
 835         default:
 836         unknown:
 837                 printf("erresc: unknown csi ");
 838                 csidump();
 839                 /* die(""); */
 840                 break;
 841         case '@': /* ICH -- Insert <n> blank char */
 842                 DEFAULT(escseq.arg[0], 1);
 843                 tinsertblank(escseq.arg[0]);
 844                 break;
 845         case 'A': /* CUU -- Cursor <n> Up */
 846         case 'e':
 847                 DEFAULT(escseq.arg[0], 1);
 848                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 849                 break;
 850         case 'B': /* CUD -- Cursor <n> Down */
 851                 DEFAULT(escseq.arg[0], 1);
 852                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 853                 break;
 854         case 'C': /* CUF -- Cursor <n> Forward */
 855         case 'a':
 856                 DEFAULT(escseq.arg[0], 1);
 857                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 858                 break;
 859         case 'D': /* CUB -- Cursor <n> Backward */
 860                 DEFAULT(escseq.arg[0], 1);
 861                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 862                 break;
 863         case 'E': /* CNL -- Cursor <n> Down and first col */
 864                 DEFAULT(escseq.arg[0], 1);
 865                 tmoveto(0, term.c.y+escseq.arg[0]);
 866                 break;
 867         case 'F': /* CPL -- Cursor <n> Up and first col */
 868                 DEFAULT(escseq.arg[0], 1);
 869                 tmoveto(0, term.c.y-escseq.arg[0]);
 870                 break;
 871         case 'G': /* CHA -- Move to <col> */
 872         case '`': /* XXX: HPA -- same? */
 873                 DEFAULT(escseq.arg[0], 1);
 874                 tmoveto(escseq.arg[0]-1, term.c.y);
 875                 break;
 876         case 'H': /* CUP -- Move to <row> <col> */
 877         case 'f': /* XXX: HVP -- same? */
 878                 DEFAULT(escseq.arg[0], 1);
 879                 DEFAULT(escseq.arg[1], 1);
 880                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 881                 break;
 882         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 883         case 'J': /* ED -- Clear screen */
 884                 switch(escseq.arg[0]) {
 885                 case 0: /* below */
 886                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 887                         break;
 888                 case 1: /* above */
 889                         tclearregion(0, 0, term.c.x, term.c.y);
 890                         break;
 891                 case 2: /* all */
 892                         tclearregion(0, 0, term.col-1, term.row-1);
 893                         break;
 894                 default:
 895                         goto unknown;
 896                 }
 897                 break;
 898         case 'K': /* EL -- Clear line */
 899                 switch(escseq.arg[0]) {
 900                 case 0: /* right */
 901                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 902                         break;
 903                 case 1: /* left */
 904                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 905                         break;
 906                 case 2: /* all */
 907                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 908                         break;
 909                 }
 910                 break;
 911         case 'S': /* SU -- Scroll <n> line up */
 912                 DEFAULT(escseq.arg[0], 1);
 913                 tscrollup(term.top, escseq.arg[0]);
 914                 break;
 915         case 'T': /* SD -- Scroll <n> line down */
 916                 DEFAULT(escseq.arg[0], 1);
 917                 tscrolldown(term.top, escseq.arg[0]);
 918                 break;
 919         case 'L': /* IL -- Insert <n> blank lines */
 920                 DEFAULT(escseq.arg[0], 1);
 921                 tinsertblankline(escseq.arg[0]);
 922                 break;
 923         case 'l': /* RM -- Reset Mode */
 924                 if(escseq.priv) {
 925                         switch(escseq.arg[0]) {
 926                         case 1:
 927                                 term.mode &= ~MODE_APPKEYPAD;
 928                                 break;
 929                         case 5: /* TODO: DECSCNM -- Remove reverse video */
 930                                 break;
 931                         case 7:
 932                                 term.mode &= ~MODE_WRAP;
 933                                 break;
 934                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
 935                                 break;
 936                         case 20:
 937                                 term.mode &= ~MODE_CRLF;
 938                                 break;
 939                         case 25:
 940                                 term.c.state |= CURSOR_HIDE;
 941                                 break;
 942                         case 1049: /* = 1047 and 1048 */
 943                         case 1047:
 944                                 if(IS_SET(MODE_ALTSCREEN)) {
 945                                         tclearregion(0, 0, term.col-1, term.row-1);
 946                                         tswapscreen();
 947                                 }
 948                                 if(escseq.arg[0] == 1047)
 949                                         break;
 950                         case 1048:
 951                                 tcursor(CURSOR_LOAD);
 952                                 break;
 953                         default:
 954                                 goto unknown;
 955                         }
 956                 } else {
 957                         switch(escseq.arg[0]) {
 958                         case 4:
 959                                 term.mode &= ~MODE_INSERT;
 960                                 break;
 961                         default:
 962                                 goto unknown;
 963                         }
 964                 }
 965                 break;
 966         case 'M': /* DL -- Delete <n> lines */
 967                 DEFAULT(escseq.arg[0], 1);
 968                 tdeleteline(escseq.arg[0]);
 969                 break;
 970         case 'X': /* ECH -- Erase <n> char */
 971                 DEFAULT(escseq.arg[0], 1);
 972                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
 973                 break;
 974         case 'P': /* DCH -- Delete <n> char */
 975                 DEFAULT(escseq.arg[0], 1);
 976                 tdeletechar(escseq.arg[0]);
 977                 break;
 978         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
 979         case 'd': /* VPA -- Move to <row> */
 980                 DEFAULT(escseq.arg[0], 1);
 981                 tmoveto(term.c.x, escseq.arg[0]-1);
 982                 break;
 983         case 'h': /* SM -- Set terminal mode */
 984                 if(escseq.priv) {
 985                         switch(escseq.arg[0]) {
 986                         case 1:
 987                                 term.mode |= MODE_APPKEYPAD;
 988                                 break;
 989                         case 5: /* DECSCNM -- Reverve video */
 990                                 /* TODO: set REVERSE on the whole screen (f) */
 991                                 break;
 992                         case 7:
 993                                 term.mode |= MODE_WRAP;
 994                                 break;
 995                         case 20:
 996                                 term.mode |= MODE_CRLF;
 997                                 break;
 998                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
 999                                  /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
1000                                 if(escseq.narg > 1 && escseq.arg[1] != 25)
1001                                         break;
1002                         case 25:
1003                                 term.c.state &= ~CURSOR_HIDE;
1004                                 break;
1005                         case 1049: /* = 1047 and 1048 */
1006                         case 1047:
1007                                 if(IS_SET(MODE_ALTSCREEN))
1008                                         tclearregion(0, 0, term.col-1, term.row-1);
1009                                 else
1010                                         tswapscreen();
1011                                 if(escseq.arg[0] == 1047)
1012                                         break;
1013                         case 1048:
1014                                 tcursor(CURSOR_SAVE);
1015                                 break;
1016                         default: goto unknown;
1017                         }
1018                 } else {
1019                         switch(escseq.arg[0]) {
1020                         case 4:
1021                                 term.mode |= MODE_INSERT;
1022                                 break;
1023                         default: goto unknown;
1024                         }
1025                 };
1026                 break;
1027         case 'm': /* SGR -- Terminal attribute (color) */
1028                 tsetattr(escseq.arg, escseq.narg);
1029                 break;
1030         case 'r': /* DECSTBM -- Set Scrolling Region */
1031                 if(escseq.priv)
1032                         goto unknown;
1033                 else {
1034                         DEFAULT(escseq.arg[0], 1);
1035                         DEFAULT(escseq.arg[1], term.row);
1036                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
1037                         tmoveto(0, 0);
1038                 }
1039                 break;
1040         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1041                 tcursor(CURSOR_SAVE);
1042                 break;
1043         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1044                 tcursor(CURSOR_LOAD);
1045                 break;
1046         }
1047 }
1048
1049 void
1050 csidump(void) {
1051         int i;
1052         printf("ESC [ %s", escseq.priv ? "? " : "");
1053         if(escseq.narg)
1054                 for(i = 0; i < escseq.narg; i++)
1055                         printf("%d ", escseq.arg[i]);
1056         if(escseq.mode)
1057                 putchar(escseq.mode);
1058         putchar('\n');
1059 }
1060
1061 void
1062 csireset(void) {
1063         memset(&escseq, 0, sizeof(escseq));
1064 }
1065
1066 void
1067 tputtab(void) {
1068         int space = TAB - term.c.x % TAB;
1069         tmoveto(term.c.x + space, term.c.y);
1070 }
1071
1072 void
1073 tputc(char c) {
1074         if(term.esc & ESC_START) {
1075                 if(term.esc & ESC_CSI) {
1076                         escseq.buf[escseq.len++] = c;
1077                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
1078                                 term.esc = 0;
1079                                 csiparse(), csihandle();
1080                         }
1081                         /* TODO: handle other OSC */
1082                 } else if(term.esc & ESC_OSC) {
1083                         if(c == ';') {
1084                                 term.titlelen = 0;
1085                                 term.esc = ESC_START | ESC_TITLE;
1086                         }
1087                 } else if(term.esc & ESC_TITLE) {
1088                         if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
1089                                 term.esc = 0;
1090                                 term.title[term.titlelen] = '\0';
1091                                 XStoreName(xw.dis, xw.win, term.title);
1092                         } else {
1093                                 term.title[term.titlelen++] = c;
1094                         }
1095                 } else if(term.esc & ESC_ALTCHARSET) {
1096                         switch(c) {
1097                         case '0': /* Line drawing crap */
1098                                 term.c.attr.mode |= ATTR_GFX;
1099                                 break;
1100                         case 'B': /* Back to regular text */
1101                                 term.c.attr.mode &= ~ATTR_GFX;
1102                                 break;
1103                         default:
1104                                 printf("esc unhandled charset: ESC ( %c\n", c);
1105                         }
1106                         term.esc = 0;
1107                 } else {
1108                         switch(c) {
1109                         case '[':
1110                                 term.esc |= ESC_CSI;
1111                                 break;
1112                         case ']':
1113                                 term.esc |= ESC_OSC;
1114                                 break;
1115                         case '(':
1116                                 term.esc |= ESC_ALTCHARSET;
1117                                 break;
1118                         case 'D': /* IND -- Linefeed */
1119                                 if(term.c.y == term.bot)
1120                                         tscrollup(term.top, 1);
1121                                 else
1122                                         tmoveto(term.c.x, term.c.y+1);
1123                                 term.esc = 0;
1124                                 break;
1125                         case 'E': /* NEL -- Next line */
1126                                 tnewline(1); /* always go to first col */
1127                                 term.esc = 0;
1128                                 break;
1129                         case 'M': /* RI -- Reverse index */
1130                                 if(term.c.y == term.top)
1131                                         tscrolldown(term.top, 1);
1132                                 else
1133                                         tmoveto(term.c.x, term.c.y-1);
1134                                 term.esc = 0;
1135                                 break;
1136                         case 'c': /* RIS -- Reset to inital state */
1137                                 treset();
1138                                 term.esc = 0;
1139                                 break;
1140                         case '=': /* DECPAM -- Application keypad */
1141                                 term.mode |= MODE_APPKEYPAD;
1142                                 term.esc = 0;
1143                                 break;
1144                         case '>': /* DECPNM -- Normal keypad */
1145                                 term.mode &= ~MODE_APPKEYPAD;
1146                                 term.esc = 0;
1147                                 break;
1148                         case '7': /* DECSC -- Save Cursor */
1149                                 tcursor(CURSOR_SAVE);
1150                                 term.esc = 0;
1151                                 break;
1152                         case '8': /* DECRC -- Restore Cursor */
1153                                 tcursor(CURSOR_LOAD);
1154                                 term.esc = 0;
1155                                 break;
1156                         default:
1157                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
1158                                 term.esc = 0;
1159                         }
1160                 }
1161         } else {
1162                 switch(c) {
1163                 case '\t':
1164                         tputtab();
1165                         break;
1166                 case '\b':
1167                         tmoveto(term.c.x-1, term.c.y);
1168                         break;
1169                 case '\r':
1170                         tmoveto(0, term.c.y);
1171                         break;
1172                 case '\f':
1173                 case '\v':
1174                 case '\n':
1175                         /* go to first col if the mode is set */
1176                         tnewline(IS_SET(MODE_CRLF));
1177                         break;
1178                 case '\a':
1179                         if(!(xw.state & WIN_FOCUSED))
1180                                 xseturgency(1);
1181                         break;
1182                 case '\033':
1183                         csireset();
1184                         term.esc = ESC_START;
1185                         break;
1186                 default:
1187                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1188                                 tnewline(1); /* always go to first col */
1189                         tsetchar(c);
1190                         if(term.c.x+1 < term.col)
1191                                 tmoveto(term.c.x+1, term.c.y);
1192                         else
1193                                 term.c.state |= CURSOR_WRAPNEXT;
1194                         break;
1195                 }
1196         }
1197 }
1198
1199 void
1200 tputs(char *s, int len) {
1201         for(; len > 0; len--)
1202                 tputc(*s++);
1203 }
1204
1205 void
1206 tresize(int col, int row) {
1207         int i, x;
1208         int minrow = MIN(row, term.row);
1209         int mincol = MIN(col, term.col);
1210         int slide = term.c.y - row + 1;
1211
1212         if(col < 1 || row < 1)
1213                 return;
1214
1215         /* free unneeded rows */
1216         i = 0;
1217         if(slide > 0) {
1218                 /* slide screen to keep cursor where we expect it -
1219                  * tscrollup would work here, but we can optimize to
1220                  * memmove because we're freeing the earlier lines */
1221                 for(/* i = 0 */; i < slide; i++) {
1222                         free(term.line[i]);
1223                         free(term.alt[i]);
1224                 }
1225                 memmove(term.line, term.line + slide, row * sizeof(Line));
1226                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1227         }
1228         for(i += row; i < term.row; i++) {
1229                 free(term.line[i]);
1230                 free(term.alt[i]);
1231         }
1232
1233         /* resize to new height */
1234         term.line = realloc(term.line, row * sizeof(Line));
1235         term.alt  = realloc(term.alt,  row * sizeof(Line));
1236
1237         /* resize each row to new width, zero-pad if needed */
1238         for(i = 0; i < minrow; i++) {
1239                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1240                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1241                 for(x = mincol; x < col; x++) {
1242                         term.line[i][x].state = 0;
1243                         term.alt[i][x].state = 0;
1244                 }
1245         }
1246
1247         /* allocate any new rows */
1248         for(/* i == minrow */; i < row; i++) {
1249                 term.line[i] = calloc(col, sizeof(Glyph));
1250                 term.alt [i] = calloc(col, sizeof(Glyph));
1251         }
1252
1253         /* update terminal size */
1254         term.col = col, term.row = row;
1255         /* make use of the LIMIT in tmoveto */
1256         tmoveto(term.c.x, term.c.y);
1257         /* reset scrolling region */
1258         tsetscroll(0, row-1);
1259 }
1260
1261 void
1262 xresize(int col, int row) {
1263         Pixmap newbuf;
1264         int oldw, oldh;
1265
1266         oldw = xw.bufw;
1267         oldh = xw.bufh;
1268         xw.bufw = MAX(1, col * xw.cw);
1269         xw.bufh = MAX(1, row * xw.ch);
1270         newbuf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1271         XCopyArea(xw.dis, xw.buf, newbuf, dc.gc, 0, 0, xw.bufw, xw.bufh, 0, 0);
1272         XFreePixmap(xw.dis, xw.buf);
1273         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1274         if(xw.bufw > oldw)
1275                 XFillRectangle(xw.dis, newbuf, dc.gc, oldw, 0,
1276                                 xw.bufw-oldw, MIN(xw.bufh, oldh));
1277         else if(xw.bufw < oldw && (BORDER > 0 || xw.w > xw.bufw))
1278                 XClearArea(xw.dis, xw.win, BORDER+xw.bufw, BORDER,
1279                                 xw.w-xw.bufh-BORDER, BORDER+MIN(xw.bufh, oldh),
1280                                 False);
1281         if(xw.bufh > oldh)
1282                 XFillRectangle(xw.dis, newbuf, dc.gc, 0, oldh,
1283                                 xw.bufw, xw.bufh-oldh);
1284         else if(xw.bufh < oldh && (BORDER > 0 || xw.h > xw.bufh))
1285                 XClearArea(xw.dis, xw.win, BORDER, BORDER+xw.bufh,
1286                                 xw.w-2*BORDER, xw.h-xw.bufh-BORDER,
1287                                 False);
1288         xw.buf = newbuf;
1289 }
1290
1291 void
1292 xloadcols(void) {
1293         int i, r, g, b;
1294         XColor color;
1295         unsigned long white = WhitePixel(xw.dis, xw.scr);
1296
1297         for(i = 0; i < 16; i++) {
1298                 if (!XAllocNamedColor(xw.dis, xw.cmap, colorname[i], &color, &color)) {
1299                         dc.col[i] = white;
1300                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1301                 } else
1302                         dc.col[i] = color.pixel;
1303         }
1304
1305         /* same colors as xterm */
1306         for(r = 0; r < 6; r++)
1307                 for(g = 0; g < 6; g++)
1308                         for(b = 0; b < 6; b++) {
1309                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1310                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1311                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1312                                 if (!XAllocColor(xw.dis, xw.cmap, &color)) {
1313                                         dc.col[i] = white;
1314                                         fprintf(stderr, "Could not allocate color %d\n", i);
1315                                 } else
1316                                         dc.col[i] = color.pixel;
1317                                 i++;
1318                         }
1319
1320         for(r = 0; r < 24; r++, i++) {
1321                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1322                 if (!XAllocColor(xw.dis, xw.cmap, &color)) {
1323                         dc.col[i] = white;
1324                         fprintf(stderr, "Could not allocate color %d\n", i);
1325                 } else
1326                         dc.col[i] = color.pixel;
1327         }
1328 }
1329
1330 void
1331 xclear(int x1, int y1, int x2, int y2) {
1332         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1333         XFillRectangle(xw.dis, xw.buf, dc.gc,
1334                        x1 * xw.cw, y1 * xw.ch,
1335                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1336 }
1337
1338 void
1339 xhints(void)
1340 {
1341         XClassHint class = {TNAME, TNAME};
1342         XWMHints wm = {.flags = InputHint, .input = 1};
1343         XSizeHints size = {
1344                 .flags = PSize | PResizeInc | PBaseSize,
1345                 .height = xw.h,
1346                 .width = xw.w,
1347                 .height_inc = xw.ch,
1348                 .width_inc = xw.cw,
1349                 .base_height = 2*BORDER,
1350                 .base_width = 2*BORDER,
1351         };
1352         XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1353 }
1354
1355 void
1356 xinit(void) {
1357         XSetWindowAttributes attrs;
1358
1359         if(!(xw.dis = XOpenDisplay(NULL)))
1360                 die("Can't open display\n");
1361         xw.scr = XDefaultScreen(xw.dis);
1362
1363         /* font */
1364         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1365                 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1366
1367         /* XXX: Assuming same size for bold font */
1368         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1369         xw.ch = dc.font->ascent + dc.font->descent;
1370
1371         /* colors */
1372         xw.cmap = XDefaultColormap(xw.dis, xw.scr);
1373         xloadcols();
1374
1375         /* window - default size */
1376         xw.bufh = 24 * xw.ch;
1377         xw.bufw = 80 * xw.cw;
1378         xw.h = xw.bufh + 2*BORDER;
1379         xw.w = xw.bufw + 2*BORDER;
1380
1381         attrs.background_pixel = dc.col[DefaultBG];
1382         attrs.border_pixel = dc.col[DefaultBG];
1383         attrs.bit_gravity = NorthWestGravity;
1384         attrs.event_mask = FocusChangeMask | KeyPressMask
1385                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1386                 | PointerMotionMask | ButtonPressMask | ButtonReleaseMask;
1387         attrs.colormap = xw.cmap;
1388
1389         xw.win = XCreateWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1390                         xw.w, xw.h, 0, XDefaultDepth(xw.dis, xw.scr), InputOutput,
1391                         XDefaultVisual(xw.dis, xw.scr),
1392                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1393                         | CWColormap,
1394                         &attrs);
1395         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1396
1397
1398         /* input methods */
1399         xw.xim = XOpenIM(xw.dis, NULL, NULL, NULL);
1400         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1401                                            | XIMStatusNothing, XNClientWindow, xw.win,
1402                                            XNFocusWindow, xw.win, NULL);
1403         /* gc */
1404         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1405
1406         XMapWindow(xw.dis, xw.win);
1407         xhints();
1408         XStoreName(xw.dis, xw.win, opt_title ? opt_title : "st");
1409         XSync(xw.dis, 0);
1410 }
1411
1412 void
1413 xdraws(char *s, Glyph base, int x, int y, int len) {
1414         unsigned long xfg, xbg;
1415         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1416         int i;
1417
1418         if(base.mode & ATTR_REVERSE)
1419                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1420         else
1421                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1422
1423         XSetBackground(xw.dis, dc.gc, xbg);
1424         XSetForeground(xw.dis, dc.gc, xfg);
1425
1426         if(base.mode & ATTR_GFX)
1427                 for(i = 0; i < len; i++) {
1428                         char c = gfx[(unsigned int)s[i] % 256];
1429                         if(c)
1430                                 s[i] = c;
1431                         else if(s[i] > 0x5f)
1432                                 s[i] -= 0x5f;
1433                 }
1434
1435         XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1436         XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1437
1438         if(base.mode & ATTR_UNDERLINE)
1439                 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1440 }
1441
1442 void
1443 xdrawcursor(void) {
1444         static int oldx = 0;
1445         static int oldy = 0;
1446         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1447
1448         LIMIT(oldx, 0, term.col-1);
1449         LIMIT(oldy, 0, term.row-1);
1450
1451         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1452                 g.c = term.line[term.c.y][term.c.x].c;
1453
1454         /* remove the old cursor */
1455         if(term.line[oldy][oldx].state & GLYPH_SET)
1456                 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1457         else
1458                 xclear(oldx, oldy, oldx, oldy);
1459
1460         /* draw the new one */
1461         if(!(term.c.state & CURSOR_HIDE) && (xw.state & WIN_FOCUSED)) {
1462                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1463                 oldx = term.c.x, oldy = term.c.y;
1464         }
1465 }
1466
1467 #ifdef DEBUG
1468 /* basic drawing routines */
1469 void
1470 xdrawc(int x, int y, Glyph g) {
1471         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1472         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1473         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1474         XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1475         XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1476 }
1477
1478 void
1479 draw(int dummy) {
1480         int x, y;
1481
1482         xclear(0, 0, term.col-1, term.row-1);
1483         for(y = 0; y < term.row; y++)
1484                 for(x = 0; x < term.col; x++)
1485                         if(term.line[y][x].state & GLYPH_SET)
1486                                 xdrawc(x, y, term.line[y][x]);
1487
1488         xdrawcursor();
1489         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1490         XFlush(xw.dis);
1491 }
1492
1493 #else
1494 /* optimized drawing routine */
1495 void
1496 draw(int redraw_all) {
1497         int i, x, y, ox;
1498         Glyph base, new;
1499         char buf[DRAW_BUF_SIZ];
1500
1501         if(!(xw.state & WIN_VISIBLE))
1502                 return;
1503
1504         xclear(0, 0, term.col-1, term.row-1);
1505         for(y = 0; y < term.row; y++) {
1506                 base = term.line[y][0];
1507                 i = ox = 0;
1508                 for(x = 0; x < term.col; x++) {
1509                         new = term.line[y][x];
1510                         if(sel.bx!=-1 && new.c && selected(x, y))
1511                                 new.mode ^= ATTR_REVERSE;
1512                         if(i > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1513                                         i >= DRAW_BUF_SIZ)) {
1514                                 xdraws(buf, base, ox, y, i);
1515                                 i = 0;
1516                         }
1517                         if(new.state & GLYPH_SET) {
1518                                 if(i == 0) {
1519                                         ox = x;
1520                                         base = new;
1521                                 }
1522                                 buf[i++] = new.c;
1523                         }
1524                 }
1525                 if(i > 0)
1526                         xdraws(buf, base, ox, y, i);
1527         }
1528         xdrawcursor();
1529         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1530 }
1531
1532 #endif
1533
1534 void
1535 expose(XEvent *ev) {
1536         XExposeEvent *e = &ev->xexpose;
1537         if(xw.state & WIN_REDRAW) {
1538                 if(!e->count) {
1539                         xw.state &= ~WIN_REDRAW;
1540                         draw(SCREEN_REDRAW);
1541                 }
1542         } else
1543                 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, e->x-BORDER, e->y-BORDER,
1544                                 e->width, e->height, e->x, e->y);
1545 }
1546
1547 void
1548 visibility(XEvent *ev) {
1549         XVisibilityEvent *e = &ev->xvisibility;
1550         if(e->state == VisibilityFullyObscured)
1551                 xw.state &= ~WIN_VISIBLE;
1552         else if(!(xw.state & WIN_VISIBLE))
1553                 /* need a full redraw for next Expose, not just a buf copy */
1554                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
1555 }
1556
1557 void
1558 unmap(XEvent *ev) {
1559         xw.state &= ~WIN_VISIBLE;
1560 }
1561
1562 void
1563 xseturgency(int add) {
1564         XWMHints *h = XGetWMHints(xw.dis, xw.win);
1565         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1566         XSetWMHints(xw.dis, xw.win, h);
1567         XFree(h);
1568 }
1569
1570 void
1571 focus(XEvent *ev) {
1572         if(ev->type == FocusIn) {
1573                 xw.state |= WIN_FOCUSED;
1574                 xseturgency(0);
1575         } else
1576                 xw.state &= ~WIN_FOCUSED;
1577         draw(SCREEN_UPDATE);
1578 }
1579
1580 char*
1581 kmap(KeySym k) {
1582         int i;
1583         for(i = 0; i < LEN(key); i++)
1584                 if(key[i].k == k)
1585                         return (char*)key[i].s;
1586         return NULL;
1587 }
1588
1589 void
1590 kpress(XEvent *ev) {
1591         XKeyEvent *e = &ev->xkey;
1592         KeySym ksym;
1593         char buf[32];
1594         char *customkey;
1595         int len;
1596         int meta;
1597         int shift;
1598         Status status;
1599
1600         meta = e->state & Mod1Mask;
1601         shift = e->state & ShiftMask;
1602         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
1603
1604         /* 1. custom keys from config.h */
1605         if((customkey = kmap(ksym)))
1606                 ttywrite(customkey, strlen(customkey));
1607         /* 2. hardcoded (overrides X lookup) */
1608         else
1609                 switch(ksym) {
1610                 case XK_Up:
1611                 case XK_Down:
1612                 case XK_Left:
1613                 case XK_Right:
1614                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1615                         ttywrite(buf, 3);
1616                         break;
1617                 case XK_Insert:
1618                         if(shift)
1619                                 selpaste();
1620                         break;
1621                 case XK_Return:
1622                         if(IS_SET(MODE_CRLF))
1623                                 ttywrite("\r\n", 2);
1624                         else
1625                                 ttywrite("\r", 1);
1626                         break;
1627                         /* 3. X lookup  */
1628                 default:
1629                         if(len > 0) {
1630                                 buf[sizeof(buf)-1] = '\0';
1631                                 if(meta && len == 1)
1632                                         ttywrite("\033", 1);
1633                                 ttywrite(buf, len);
1634                         } else /* 4. nothing to send */
1635                                 fprintf(stderr, "errkey: %d\n", (int)ksym);
1636                         break;
1637                 }
1638 }
1639
1640 void
1641 resize(XEvent *e) {
1642         int col, row;
1643
1644         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1645                 return;
1646
1647         xw.w = e->xconfigure.width;
1648         xw.h = e->xconfigure.height;
1649         col = (xw.w - 2*BORDER) / xw.cw;
1650         row = (xw.h - 2*BORDER) / xw.ch;
1651         if(col == term.col && row == term.row)
1652                 return;
1653         tresize(col, row);
1654         ttyresize(col, row);
1655         xresize(col, row);
1656 }
1657
1658 void
1659 run(void) {
1660         XEvent ev;
1661         fd_set rfd;
1662         int xfd = XConnectionNumber(xw.dis);
1663
1664         for(;;) {
1665                 FD_ZERO(&rfd);
1666                 FD_SET(cmdfd, &rfd);
1667                 FD_SET(xfd, &rfd);
1668                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1669                         if(errno == EINTR)
1670                                 continue;
1671                         die("select failed: %s\n", SERRNO);
1672                 }
1673                 if(FD_ISSET(cmdfd, &rfd)) {
1674                         ttyread();
1675                         draw(SCREEN_UPDATE);
1676                 }
1677                 while(XPending(xw.dis)) {
1678                         XNextEvent(xw.dis, &ev);
1679                         if (XFilterEvent(&ev, xw.win))
1680                                 continue;
1681                         if(handler[ev.type])
1682                                 (handler[ev.type])(&ev);
1683                 }
1684         }
1685 }
1686
1687 int
1688 main(int argc, char *argv[]) {
1689         int i;
1690
1691         for(i = 1; i < argc; i++) {
1692                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
1693                 case 't':
1694                         if(++i < argc) opt_title = argv[i];
1695                         break;
1696                 case 'e':
1697                         if(++i < argc) opt_cmd = argv[i];
1698                         break;
1699                 case 'v':
1700                 default:
1701                         die(USAGE);
1702                 }
1703         }
1704         setlocale(LC_CTYPE, "");
1705         tnew(80, 24);
1706         ttynew();
1707         xinit();
1708         selinit();
1709         run();
1710         return 0;
1711 }