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 #define UTF_SIZ       4
  42
  43 #define SERRNO strerror(errno)
  44 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  45 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  46 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  47 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  48 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  49 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  50 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  51 #define IS_SET(flag) (term.mode & (flag))
  52
  53 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  54 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
  55 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
  56        CURSOR_SAVE, CURSOR_LOAD };
  57 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
  58 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  59 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8,
  60        MODE_CRLF=16 };
  61 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  62 enum { SCREEN_UPDATE, SCREEN_REDRAW };
  63 enum { WIN_VISIBLE=1, WIN_REDRAW=2, WIN_FOCUSED=4 };
  64
  65 #undef B0
  66 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
  67
  68 typedef struct {
  69         char c[UTF_SIZ];     /* character code */
  70         char mode;  /* attribute flags */
  71         int fg;     /* foreground      */
  72         int bg;     /* background      */
  73         char state; /* state flags     */
  74 } Glyph;
  75
  76 typedef Glyph* Line;
  77
  78 typedef struct {
  79         Glyph attr;      /* current char attributes */
  80         int x;
  81         int y;
  82         char state;
  83 } TCursor;
  84
  85 /* CSI Escape sequence structs */
  86 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  87 typedef struct {
  88         char buf[ESC_BUF_SIZ]; /* raw string */
  89         int len;                           /* raw string length */
  90         char priv;
  91         int arg[ESC_ARG_SIZ];
  92         int narg;                          /* nb of args */
  93         char mode;
  94 } CSIEscape;
  95
  96 /* Internal representation of the screen */
  97 typedef struct {
  98         int row;        /* nb row */
  99         int col;        /* nb col */
 100         Line* line;     /* screen */
 101         Line* alt;      /* alternate screen */
 102         TCursor c;      /* cursor */
 103         int top;        /* top    scroll limit */
 104         int bot;        /* bottom scroll limit */
 105         int mode;       /* terminal mode flags */
 106         int esc;        /* escape state flags */
 107         char title[ESC_TITLE_SIZ];
 108         int titlelen;
 109 } Term;
 110
 111 /* Purely graphic info */
 112 typedef struct {
 113         Display* dis;
 114         Colormap cmap;
 115         Window win;
 116         Pixmap buf;
 117         XIM xim;
 118         XIC xic;
 119         int scr;
 120         int w;  /* window width  */
 121         int h;  /* window height */
 122         int bufw; /* pixmap width  */
 123         int bufh; /* pixmap height */
 124         int ch; /* char height */
 125         int cw; /* char width  */
 126         char state; /* focus, redraw, visible */
 127 } XWindow;
 128
 129 typedef struct {
 130         KeySym k;
 131         char s[ESC_BUF_SIZ];
 132 } Key;
 133
 134 typedef struct {
 135         XFontSet fs;
 136         short lbearing;
 137         short rbearing;
 138         int ascent;
 139         int descent;
 140 } FontInfo;
 141
 142 /* Drawing Context */
 143 typedef struct {
 144         unsigned long col[256];
 145         FontInfo font;
 146         FontInfo bfont;
 147         GC gc;
 148 } DC;
 149
 150 /* TODO: use better name for vars... */
 151 typedef struct {
 152         int mode;
 153         int bx, by;
 154         int ex, ey;
 155         struct {int x, y;}  b, e;
 156         char *clip;
 157 } Selection;
 158
 159 #include "config.h"
 160
 161 static void die(const char *errstr, ...);
 162 static void draw(int);
 163 static void execsh(void);
 164 static void sigchld(int);
 165 static void run(void);
 166
 167 static void csidump(void);
 168 static void csihandle(void);
 169 static void csiparse(void);
 170 static void csireset(void);
 171
 172 static void tclearregion(int, int, int, int);
 173 static void tcursor(int);
 174 static void tdeletechar(int);
 175 static void tdeleteline(int);
 176 static void tinsertblank(int);
 177 static void tinsertblankline(int);
 178 static void tmoveto(int, int);
 179 static void tnew(int, int);
 180 static void tnewline(int);
 181 static void tputtab(void);
 182 static void tputc(char*);
 183 static void treset(void);
 184 static int tresize(int, int);
 185 static void tscrollup(int, int);
 186 static void tscrolldown(int, int);
 187 static void tsetattr(int*, int);
 188 static void tsetchar(char*);
 189 static void tsetscroll(int, int);
 190 static void tswapscreen(void);
 191
 192 static void ttynew(void);
 193 static void ttyread(void);
 194 static void ttyresize(int, int);
 195 static void ttywrite(const char *, size_t);
 196
 197 static void xdraws(char *, Glyph, int, int, int, int);
 198 static void xhints(void);
 199 static void xclear(int, int, int, int);
 200 static void xdrawcursor(void);
 201 static void xinit(void);
 202 static void xloadcols(void);
 203 static void xseturgency(int);
 204 static void xsetsel(char*);
 205 static void xresize(int, int);
 206
 207 static void expose(XEvent *);
 208 static void visibility(XEvent *);
 209 static void unmap(XEvent *);
 210 static char* kmap(KeySym);
 211 static void kpress(XEvent *);
 212 static void resize(XEvent *);
 213 static void focus(XEvent *);
 214 static void brelease(XEvent *);
 215 static void bpress(XEvent *);
 216 static void bmotion(XEvent *);
 217 static void selnotify(XEvent *);
 218 static void selrequest(XEvent *);
 219
 220 static void selinit(void);
 221 static inline int selected(int, int);
 222 static void selcopy(void);
 223 static void selpaste(void);
 224
 225 static int stou(char *, long *);
 226 static int utos(long *, char *);
 227 static int slen(char *);
 228 static int canstou(char *, int);
 229
 230 static void (*handler[LASTEvent])(XEvent *) = {
 231         [KeyPress] = kpress,
 232         [ConfigureNotify] = resize,
 233         [VisibilityNotify] = visibility,
 234         [UnmapNotify] = unmap,
 235         [Expose] = expose,
 236         [FocusIn] = focus,
 237         [FocusOut] = focus,
 238         [MotionNotify] = bmotion,
 239         [ButtonPress] = bpress,
 240         [ButtonRelease] = brelease,
 241         [SelectionNotify] = selnotify,
 242         [SelectionRequest] = selrequest,
 243 };
 244
 245 /* Globals */
 246 static DC dc;
 247 static XWindow xw;
 248 static Term term;
 249 static CSIEscape escseq;
 250 static int cmdfd;
 251 static pid_t pid;
 252 static Selection sel;
 253 static char *opt_cmd   = NULL;
 254 static char *opt_title = NULL;
 255
 256 /* UTF-8 decode */
 257 static int stou(char *s, long *u) {
 258         unsigned char c;
 259         int i, n, rtn;
 260
 261         rtn = 1;
 262         c = *s;
 263         if(~c&B7) { /* 0xxxxxxx */
 264                 *u = c;
 265                 return rtn;
 266         } else if ((c&(B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 267                 *u = c&(B4|B3|B2|B1|B0);
 268                 n = 1;
 269         } else if ((c&(B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 270                 *u = c&(B3|B2|B1|B0);
 271                 n = 2;
 272         } else if ((c&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 273                 *u = c&(B2|B1|B0);
 274                 n = 3;
 275         } else
 276                 goto invalid;
 277         for (i=n,++s; i>0; --i,++rtn,++s) {
 278                 c = *s;
 279                 if ((c&(B7|B6)) != B7) /* 10xxxxxx */
 280                         goto invalid;
 281                 *u <<= 6;
 282                 *u |= c&(B5|B4|B3|B2|B1|B0);
 283         }
 284         if ((n == 1 && *u < 0x80) ||
 285             (n == 2 && *u < 0x800) ||
 286             (n == 3 && *u < 0x10000) ||
 287             (*u >= 0xD800 && *u <= 0xDFFF))
 288                 goto invalid;
 289         return rtn;
 290 invalid:
 291         *u = 0xFFFD;
 292         return rtn;
 293 }
 294
 295 /* UTF-8 encode */
 296 static int utos(long *u, char *s) {
 297         unsigned char *sp;
 298         unsigned long uc;
 299         int i, n;
 300
 301         sp = (unsigned char*) s;
 302         uc = *u;
 303         if (uc < 0x80) {
 304                 *sp = uc; /* 0xxxxxxx */
 305                 return 1;
 306         } else if (*u < 0x800) {
 307                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 308                 n = 1;
 309         } else if (uc < 0x10000) {
 310                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 311                 n = 2;
 312         } else if (uc <= 0x10FFFF) {
 313                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 314                 n = 3;
 315         } else {
 316                 goto invalid;
 317         }
 318         for (i=n,++sp; i>0; --i,++sp)
 319                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 320         return n+1;
 321 invalid:
 322         /* U+FFFD */
 323         *s++ = '\xEF';
 324         *s++ = '\xBF';
 325         *s = '\xBD';
 326         return 3;
 327 }
 328
 329 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 330    UTF-8 otherwise return 0 */
 331 static int canstou(char *s, int b) {
 332         unsigned char c = *s;
 333         int n;
 334
 335         if (b < 1)
 336                 return 0;
 337         else if (~c&B7)
 338                 return 1;
 339         else if ((c&(B7|B6|B5)) == (B7|B6))
 340                 n = 1;
 341         else if ((c&(B7|B6|B5|B4)) == (B7|B6|B5))
 342                 n = 2;
 343         else if ((c&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4))
 344                 n = 3;
 345         else
 346                 return 1;
 347         for (--b,++s; n>0&&b>0; --n,--b,++s) {
 348                 c = *s;
 349                 if ((c&(B7|B6)) != B7)
 350                         break;
 351         }
 352         if (n > 0 && b == 0)
 353                 return 0;
 354         else
 355                 return 1;
 356 }
 357
 358 static int slen(char *s) {
 359         unsigned char c = *s;
 360
 361         if (~c&B7)
 362                 return 1;
 363         else if ((c&(B7|B6|B5)) == (B7|B6))
 364                 return 2;
 365         else if ((c&(B7|B6|B5|B4)) == (B7|B6|B5))
 366                 return 3;
 367         else
 368                 return 4;
 369 }
 370
 371 static void selinit(void) {
 372         sel.mode = 0;
 373         sel.bx = -1;
 374         sel.clip = NULL;
 375 }
 376
 377 static inline int selected(int x, int y) {
 378         if(sel.ey == y && sel.by == y) {
 379                 int bx = MIN(sel.bx, sel.ex);
 380                 int ex = MAX(sel.bx, sel.ex);
 381                 return BETWEEN(x, bx, ex);
 382         }
 383         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 384                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 385 }
 386
 387 static void getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 388         if(b)
 389                 *b = e->xbutton.button;
 390
 391         *x = e->xbutton.x/xw.cw;
 392         *y = e->xbutton.y/xw.ch;
 393         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 394         sel.b.y = MIN(sel.by, sel.ey);
 395         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 396         sel.e.y = MAX(sel.by, sel.ey);
 397 }
 398
 399 static void bpress(XEvent *e) {
 400         sel.mode = 1;
 401         sel.ex = sel.bx = e->xbutton.x/xw.cw;
 402         sel.ey = sel.by = e->xbutton.y/xw.ch;
 403 }
 404
 405 static void selcopy() {
 406         char *str, *ptr;
 407         int ls, x, y, sz, sl;
 408
 409         if(sel.bx == -1)
 410                 str = NULL;
 411         else {
 412                 sz = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 413                 ptr = str = malloc(sz);
 414                 for(y = 0; y < term.row; y++) {
 415                         for(x = 0; x < term.col; x++)
 416                                 if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y))) {
 417                                         sl = slen(term.line[y][x].c);
 418                                         memcpy(ptr, term.line[y][x].c, sl);
 419                                         ptr += sl;
 420                                 }
 421                         if(ls)
 422                                 *ptr = '\n', ptr++;
 423                 }
 424                 *ptr = 0;
 425         }
 426         xsetsel(str);
 427 }
 428
 429 static void selnotify(XEvent *e) {
 430         unsigned long nitems;
 431         unsigned long ofs, rem;
 432         int format;
 433         unsigned char *data;
 434         Atom type;
 435
 436         ofs = 0;
 437         do {
 438                 if(XGetWindowProperty(xw.dis, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 439                                         False, AnyPropertyType, &type, &format,
 440                                         &nitems, &rem, &data)) {
 441                         fprintf(stderr, "Clipboard allocation failed\n");
 442                         return;
 443                 }
 444                 ttywrite((const char *) data, nitems * format / 8);
 445                 XFree(data);
 446                 /* number of 32-bit chunks returned */
 447                 ofs += nitems * format / 32;
 448         } while(rem > 0);
 449 }
 450
 451 static void selpaste() {
 452         XConvertSelection(xw.dis, XA_PRIMARY, XA_STRING, XA_PRIMARY, xw.win, CurrentTime);
 453 }
 454
 455 static void selrequest(XEvent *e)
 456 {
 457         XSelectionRequestEvent *xsre;
 458         XSelectionEvent xev;
 459         Atom xa_targets;
 460
 461         xsre = (XSelectionRequestEvent *) e;
 462         xev.type = SelectionNotify;
 463         xev.requestor = xsre->requestor;
 464         xev.selection = xsre->selection;
 465         xev.target = xsre->target;
 466         xev.time = xsre->time;
 467         /* reject */
 468         xev.property = None;
 469
 470         xa_targets = XInternAtom(xw.dis, "TARGETS", 0);
 471         if(xsre->target == xa_targets) {
 472                 /* respond with the supported type */
 473                 Atom string = XA_STRING;
 474                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 475                                 XA_ATOM, 32, PropModeReplace,
 476                                 (unsigned char *) &string, 1);
 477                 xev.property = xsre->property;
 478         } else if(xsre->target == XA_STRING) {
 479                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 480                                 xsre->target, 8, PropModeReplace,
 481                                 (unsigned char *) sel.clip, strlen(sel.clip));
 482                 xev.property = xsre->property;
 483         }
 484
 485         /* all done, send a notification to the listener */
 486         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 487                 fprintf(stderr, "Error sending SelectionNotify event\n");
 488 }
 489
 490 static void xsetsel(char *str) {
 491         /* register the selection for both the clipboard and the primary */
 492         Atom clipboard;
 493
 494         free(sel.clip);
 495         sel.clip = str;
 496
 497         XSetSelectionOwner(xw.dis, XA_PRIMARY, xw.win, CurrentTime);
 498
 499         clipboard = XInternAtom(xw.dis, "CLIPBOARD", 0);
 500         XSetSelectionOwner(xw.dis, clipboard, xw.win, CurrentTime);
 501
 502         XFlush(xw.dis);
 503 }
 504
 505 /* TODO: doubleclick to select word */
 506 static void brelease(XEvent *e) {
 507         int b;
 508         sel.mode = 0;
 509         getbuttoninfo(e, &b, &sel.ex, &sel.ey);
 510         if(sel.bx==sel.ex && sel.by==sel.ey) {
 511                 sel.bx = -1;
 512                 if(b==2)
 513                         selpaste();
 514         } else {
 515                 if(b==1)
 516                         selcopy();
 517         }
 518         draw(1);
 519 }
 520
 521 static void bmotion(XEvent *e) {
 522         if (sel.mode) {
 523                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 524                 //      draw(1);
 525         }
 526 }
 527
 528 #ifdef DEBUG
 529 void
 530 tdump(void) {
 531         int row, col;
 532         Glyph c;
 533
 534         for(row = 0; row < term.row; row++) {
 535                 for(col = 0; col < term.col; col++) {
 536                         if(col == term.c.x && row == term.c.y)
 537                                 putchar('#');
 538                         else {
 539                                 c = term.line[row][col];
 540                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 541                         }
 542                 }
 543                 putchar('\n');
 544         }
 545 }
 546 #endif
 547
 548 void
 549 die(const char *errstr, ...) {
 550         va_list ap;
 551
 552         va_start(ap, errstr);
 553         vfprintf(stderr, errstr, ap);
 554         va_end(ap);
 555         exit(EXIT_FAILURE);
 556 }
 557
 558 void
 559 execsh(void) {
 560         char *args[] = {getenv("SHELL"), "-i", NULL};
 561         if(opt_cmd)
 562                 args[0] = opt_cmd, args[1] = NULL;
 563         else
 564                 DEFAULT(args[0], SHELL);
 565         putenv("TERM="TNAME);
 566         execvp(args[0], args);
 567 }
 568
 569 void
 570 sigchld(int a) {
 571         int stat = 0;
 572         if(waitpid(pid, &stat, 0) < 0)
 573                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 574         if(WIFEXITED(stat))
 575                 exit(WEXITSTATUS(stat));
 576         else
 577                 exit(EXIT_FAILURE);
 578 }
 579
 580 void
 581 ttynew(void) {
 582         int m, s;
 583
 584         /* seems to work fine on linux, openbsd and freebsd */
 585         struct winsize w = {term.row, term.col, 0, 0};
 586         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 587                 die("openpty failed: %s\n", SERRNO);
 588
 589         switch(pid = fork()) {
 590         case -1:
 591                 die("fork failed\n");
 592                 break;
 593         case 0:
 594                 setsid(); /* create a new process group */
 595                 dup2(s, STDIN_FILENO);
 596                 dup2(s, STDOUT_FILENO);
 597                 dup2(s, STDERR_FILENO);
 598                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 599                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 600                 close(s);
 601                 close(m);
 602                 execsh();
 603                 break;
 604         default:
 605                 close(s);
 606                 cmdfd = m;
 607                 signal(SIGCHLD, sigchld);
 608         }
 609 }
 610
 611 void
 612 dump(char c) {
 613         static int col;
 614         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 615         if(++col % 10 == 0)
 616                 fprintf(stderr, "\n");
 617 }
 618
 619 void
 620 ttyread(void) {
 621         char buf[BUFSIZ], *ptr;
 622         char s[UTF_SIZ];
 623         int ret, br;
 624         static int buflen = 0;
 625         long u;
 626
 627         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 628                 die("Couldn't read from shell: %s\n", SERRNO);
 629         else {
 630                 buflen += ret;
 631                 for(ptr=buf; buflen>=UTF_SIZ||canstou(ptr,buflen); buflen-=br) {
 632                         br = stou(ptr, &u);
 633                         utos(&u, s);
 634                         tputc(s);
 635                         ptr += br;
 636                 }
 637                 memcpy(buf, ptr, buflen);
 638         }
 639 }
 640
 641 void
 642 ttywrite(const char *s, size_t n) {
 643         if(write(cmdfd, s, n) == -1)
 644                 die("write error on tty: %s\n", SERRNO);
 645 }
 646
 647 void
 648 ttyresize(int x, int y) {
 649         struct winsize w;
 650
 651         w.ws_row = term.row;
 652         w.ws_col = term.col;
 653         w.ws_xpixel = w.ws_ypixel = 0;
 654         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 655                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 656 }
 657
 658 void
 659 tcursor(int mode) {
 660         static TCursor c;
 661
 662         if(mode == CURSOR_SAVE)
 663                 c = term.c;
 664         else if(mode == CURSOR_LOAD)
 665                 term.c = c, tmoveto(c.x, c.y);
 666 }
 667
 668 void
 669 treset(void) {
 670         term.c = (TCursor){{
 671                 .mode = ATTR_NULL,
 672                 .fg = DefaultFG,
 673                 .bg = DefaultBG
 674         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 675
 676         term.top = 0, term.bot = term.row - 1;
 677         term.mode = MODE_WRAP;
 678         tclearregion(0, 0, term.col-1, term.row-1);
 679 }
 680
 681 void
 682 tnew(int col, int row) {
 683         /* set screen size */
 684         term.row = row, term.col = col;
 685         term.line = malloc(term.row * sizeof(Line));
 686         term.alt  = malloc(term.row * sizeof(Line));
 687         for(row = 0 ; row < term.row; row++) {
 688                 term.line[row] = malloc(term.col * sizeof(Glyph));
 689                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 690         }
 691         /* setup screen */
 692         treset();
 693 }
 694
 695 void
 696 tswapscreen(void) {
 697         Line* tmp = term.line;
 698         term.line = term.alt;
 699         term.alt = tmp;
 700         term.mode ^= MODE_ALTSCREEN;
 701 }
 702
 703 void
 704 tscrolldown(int orig, int n) {
 705         int i;
 706         Line temp;
 707
 708         LIMIT(n, 0, term.bot-orig+1);
 709
 710         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 711
 712         for(i = term.bot; i >= orig+n; i--) {
 713                 temp = term.line[i];
 714                 term.line[i] = term.line[i-n];
 715                 term.line[i-n] = temp;
 716         }
 717 }
 718
 719 void
 720 tscrollup(int orig, int n) {
 721         int i;
 722         Line temp;
 723         LIMIT(n, 0, term.bot-orig+1);
 724
 725         tclearregion(0, orig, term.col-1, orig+n-1);
 726
 727         for(i = orig; i <= term.bot-n; i++) {
 728                  temp = term.line[i];
 729                  term.line[i] = term.line[i+n];
 730                  term.line[i+n] = temp;
 731         }
 732 }
 733
 734 void
 735 tnewline(int first_col) {
 736         int y = term.c.y;
 737         if(y == term.bot)
 738                 tscrollup(term.top, 1);
 739         else
 740                 y++;
 741         tmoveto(first_col ? 0 : term.c.x, y);
 742 }
 743
 744 void
 745 csiparse(void) {
 746         /* int noarg = 1; */
 747         char *p = escseq.buf;
 748
 749         escseq.narg = 0;
 750         if(*p == '?')
 751                 escseq.priv = 1, p++;
 752
 753         while(p < escseq.buf+escseq.len) {
 754                 while(isdigit(*p)) {
 755                         escseq.arg[escseq.narg] *= 10;
 756                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 757                 }
 758                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 759                         escseq.narg++, p++;
 760                 else {
 761                         escseq.mode = *p;
 762                         escseq.narg++;
 763                         return;
 764                 }
 765         }
 766 }
 767
 768 void
 769 tmoveto(int x, int y) {
 770         LIMIT(x, 0, term.col-1);
 771         LIMIT(y, 0, term.row-1);
 772         term.c.state &= ~CURSOR_WRAPNEXT;
 773         term.c.x = x;
 774         term.c.y = y;
 775 }
 776
 777 void
 778 tsetchar(char *c) {
 779         term.line[term.c.y][term.c.x] = term.c.attr;
 780         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
 781         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 782 }
 783
 784 void
 785 tclearregion(int x1, int y1, int x2, int y2) {
 786         int x, y, temp;
 787
 788         if(x1 > x2)
 789                 temp = x1, x1 = x2, x2 = temp;
 790         if(y1 > y2)
 791                 temp = y1, y1 = y2, y2 = temp;
 792
 793         LIMIT(x1, 0, term.col-1);
 794         LIMIT(x2, 0, term.col-1);
 795         LIMIT(y1, 0, term.row-1);
 796         LIMIT(y2, 0, term.row-1);
 797
 798         for(y = y1; y <= y2; y++)
 799                 for(x = x1; x <= x2; x++)
 800                         term.line[y][x].state = 0;
 801 }
 802
 803 void
 804 tdeletechar(int n) {
 805         int src = term.c.x + n;
 806         int dst = term.c.x;
 807         int size = term.col - src;
 808
 809         if(src >= term.col) {
 810                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 811                 return;
 812         }
 813         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 814         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 815 }
 816
 817 void
 818 tinsertblank(int n) {
 819         int src = term.c.x;
 820         int dst = src + n;
 821         int size = term.col - dst;
 822
 823         if(dst >= term.col) {
 824                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 825                 return;
 826         }
 827         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 828         tclearregion(src, term.c.y, dst - 1, term.c.y);
 829 }
 830
 831 void
 832 tinsertblankline(int n) {
 833         if(term.c.y < term.top || term.c.y > term.bot)
 834                 return;
 835
 836         tscrolldown(term.c.y, n);
 837 }
 838
 839 void
 840 tdeleteline(int n) {
 841         if(term.c.y < term.top || term.c.y > term.bot)
 842                 return;
 843
 844         tscrollup(term.c.y, n);
 845 }
 846
 847 void
 848 tsetattr(int *attr, int l) {
 849         int i;
 850
 851         for(i = 0; i < l; i++) {
 852                 switch(attr[i]) {
 853                 case 0:
 854                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 855                         term.c.attr.fg = DefaultFG;
 856                         term.c.attr.bg = DefaultBG;
 857                         break;
 858                 case 1:
 859                         term.c.attr.mode |= ATTR_BOLD;
 860                         break;
 861                 case 4:
 862                         term.c.attr.mode |= ATTR_UNDERLINE;
 863                         break;
 864                 case 7:
 865                         term.c.attr.mode |= ATTR_REVERSE;
 866                         break;
 867                 case 22:
 868                         term.c.attr.mode &= ~ATTR_BOLD;
 869                         break;
 870                 case 24:
 871                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 872                         break;
 873                 case 27:
 874                         term.c.attr.mode &= ~ATTR_REVERSE;
 875                         break;
 876                 case 38:
 877                         if (i + 2 < l && attr[i + 1] == 5) {
 878                                 i += 2;
 879                                 if (BETWEEN(attr[i], 0, 255))
 880                                         term.c.attr.fg = attr[i];
 881                                 else
 882                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 883                         }
 884                         else
 885                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 886                         break;
 887                 case 39:
 888                         term.c.attr.fg = DefaultFG;
 889                         break;
 890                 case 48:
 891                         if (i + 2 < l && attr[i + 1] == 5) {
 892                                 i += 2;
 893                                 if (BETWEEN(attr[i], 0, 255))
 894                                         term.c.attr.bg = attr[i];
 895                                 else
 896                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 897                         }
 898                         else
 899                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 900                         break;
 901                 case 49:
 902                         term.c.attr.bg = DefaultBG;
 903                         break;
 904                 default:
 905                         if(BETWEEN(attr[i], 30, 37))
 906                                 term.c.attr.fg = attr[i] - 30;
 907                         else if(BETWEEN(attr[i], 40, 47))
 908                                 term.c.attr.bg = attr[i] - 40;
 909                         else if(BETWEEN(attr[i], 90, 97))
 910                                 term.c.attr.fg = attr[i] - 90 + 8;
 911                         else if(BETWEEN(attr[i], 100, 107))
 912                                 term.c.attr.fg = attr[i] - 100 + 8;
 913                         else
 914                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
 915
 916                         break;
 917                 }
 918         }
 919 }
 920
 921 void
 922 tsetscroll(int t, int b) {
 923         int temp;
 924
 925         LIMIT(t, 0, term.row-1);
 926         LIMIT(b, 0, term.row-1);
 927         if(t > b) {
 928                 temp = t;
 929                 t = b;
 930                 b = temp;
 931         }
 932         term.top = t;
 933         term.bot = b;
 934 }
 935
 936 void
 937 csihandle(void) {
 938         switch(escseq.mode) {
 939         default:
 940         unknown:
 941                 printf("erresc: unknown csi ");
 942                 csidump();
 943                 /* die(""); */
 944                 break;
 945         case '@': /* ICH -- Insert <n> blank char */
 946                 DEFAULT(escseq.arg[0], 1);
 947                 tinsertblank(escseq.arg[0]);
 948                 break;
 949         case 'A': /* CUU -- Cursor <n> Up */
 950         case 'e':
 951                 DEFAULT(escseq.arg[0], 1);
 952                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 953                 break;
 954         case 'B': /* CUD -- Cursor <n> Down */
 955                 DEFAULT(escseq.arg[0], 1);
 956                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 957                 break;
 958         case 'C': /* CUF -- Cursor <n> Forward */
 959         case 'a':
 960                 DEFAULT(escseq.arg[0], 1);
 961                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 962                 break;
 963         case 'D': /* CUB -- Cursor <n> Backward */
 964                 DEFAULT(escseq.arg[0], 1);
 965                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 966                 break;
 967         case 'E': /* CNL -- Cursor <n> Down and first col */
 968                 DEFAULT(escseq.arg[0], 1);
 969                 tmoveto(0, term.c.y+escseq.arg[0]);
 970                 break;
 971         case 'F': /* CPL -- Cursor <n> Up and first col */
 972                 DEFAULT(escseq.arg[0], 1);
 973                 tmoveto(0, term.c.y-escseq.arg[0]);
 974                 break;
 975         case 'G': /* CHA -- Move to <col> */
 976         case '`': /* XXX: HPA -- same? */
 977                 DEFAULT(escseq.arg[0], 1);
 978                 tmoveto(escseq.arg[0]-1, term.c.y);
 979                 break;
 980         case 'H': /* CUP -- Move to <row> <col> */
 981         case 'f': /* XXX: HVP -- same? */
 982                 DEFAULT(escseq.arg[0], 1);
 983                 DEFAULT(escseq.arg[1], 1);
 984                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 985                 break;
 986         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 987         case 'J': /* ED -- Clear screen */
 988                 switch(escseq.arg[0]) {
 989                 case 0: /* below */
 990                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 991                         if(term.c.y < term.row-1)
 992                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
 993                         break;
 994                 case 1: /* above */
 995                         if(term.c.y > 1)
 996                                 tclearregion(0, 0, term.col-1, term.c.y-1);
 997                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 998                         break;
 999                 case 2: /* all */
1000                         tclearregion(0, 0, term.col-1, term.row-1);
1001                         break;
1002                 default:
1003                         goto unknown;
1004                 }
1005                 break;
1006         case 'K': /* EL -- Clear line */
1007                 switch(escseq.arg[0]) {
1008                 case 0: /* right */
1009                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1010                         break;
1011                 case 1: /* left */
1012                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1013                         break;
1014                 case 2: /* all */
1015                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1016                         break;
1017                 }
1018                 break;
1019         case 'S': /* SU -- Scroll <n> line up */
1020                 DEFAULT(escseq.arg[0], 1);
1021                 tscrollup(term.top, escseq.arg[0]);
1022                 break;
1023         case 'T': /* SD -- Scroll <n> line down */
1024                 DEFAULT(escseq.arg[0], 1);
1025                 tscrolldown(term.top, escseq.arg[0]);
1026                 break;
1027         case 'L': /* IL -- Insert <n> blank lines */
1028                 DEFAULT(escseq.arg[0], 1);
1029                 tinsertblankline(escseq.arg[0]);
1030                 break;
1031         case 'l': /* RM -- Reset Mode */
1032                 if(escseq.priv) {
1033                         switch(escseq.arg[0]) {
1034                         case 1:
1035                                 term.mode &= ~MODE_APPKEYPAD;
1036                                 break;
1037                         case 5: /* TODO: DECSCNM -- Remove reverse video */
1038                                 break;
1039                         case 7:
1040                                 term.mode &= ~MODE_WRAP;
1041                                 break;
1042                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
1043                                 break;
1044                         case 20:
1045                                 term.mode &= ~MODE_CRLF;
1046                                 break;
1047                         case 25:
1048                                 term.c.state |= CURSOR_HIDE;
1049                                 break;
1050                         case 1049: /* = 1047 and 1048 */
1051                         case 1047:
1052                                 if(IS_SET(MODE_ALTSCREEN)) {
1053                                         tclearregion(0, 0, term.col-1, term.row-1);
1054                                         tswapscreen();
1055                                 }
1056                                 if(escseq.arg[0] == 1047)
1057                                         break;
1058                         case 1048:
1059                                 tcursor(CURSOR_LOAD);
1060                                 break;
1061                         default:
1062                                 goto unknown;
1063                         }
1064                 } else {
1065                         switch(escseq.arg[0]) {
1066                         case 4:
1067                                 term.mode &= ~MODE_INSERT;
1068                                 break;
1069                         default:
1070                                 goto unknown;
1071                         }
1072                 }
1073                 break;
1074         case 'M': /* DL -- Delete <n> lines */
1075                 DEFAULT(escseq.arg[0], 1);
1076                 tdeleteline(escseq.arg[0]);
1077                 break;
1078         case 'X': /* ECH -- Erase <n> char */
1079                 DEFAULT(escseq.arg[0], 1);
1080                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
1081                 break;
1082         case 'P': /* DCH -- Delete <n> char */
1083                 DEFAULT(escseq.arg[0], 1);
1084                 tdeletechar(escseq.arg[0]);
1085                 break;
1086         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
1087         case 'd': /* VPA -- Move to <row> */
1088                 DEFAULT(escseq.arg[0], 1);
1089                 tmoveto(term.c.x, escseq.arg[0]-1);
1090                 break;
1091         case 'h': /* SM -- Set terminal mode */
1092                 if(escseq.priv) {
1093                         switch(escseq.arg[0]) {
1094                         case 1:
1095                                 term.mode |= MODE_APPKEYPAD;
1096                                 break;
1097                         case 5: /* DECSCNM -- Reverve video */
1098                                 /* TODO: set REVERSE on the whole screen (f) */
1099                                 break;
1100                         case 7:
1101                                 term.mode |= MODE_WRAP;
1102                                 break;
1103                         case 20:
1104                                 term.mode |= MODE_CRLF;
1105                                 break;
1106                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1107                                  /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
1108                                 if(escseq.narg > 1 && escseq.arg[1] != 25)
1109                                         break;
1110                         case 25:
1111                                 term.c.state &= ~CURSOR_HIDE;
1112                                 break;
1113                         case 1049: /* = 1047 and 1048 */
1114                         case 1047:
1115                                 if(IS_SET(MODE_ALTSCREEN))
1116                                         tclearregion(0, 0, term.col-1, term.row-1);
1117                                 else
1118                                         tswapscreen();
1119                                 if(escseq.arg[0] == 1047)
1120                                         break;
1121                         case 1048:
1122                                 tcursor(CURSOR_SAVE);
1123                                 break;
1124                         default: goto unknown;
1125                         }
1126                 } else {
1127                         switch(escseq.arg[0]) {
1128                         case 4:
1129                                 term.mode |= MODE_INSERT;
1130                                 break;
1131                         default: goto unknown;
1132                         }
1133                 };
1134                 break;
1135         case 'm': /* SGR -- Terminal attribute (color) */
1136                 tsetattr(escseq.arg, escseq.narg);
1137                 break;
1138         case 'r': /* DECSTBM -- Set Scrolling Region */
1139                 if(escseq.priv)
1140                         goto unknown;
1141                 else {
1142                         DEFAULT(escseq.arg[0], 1);
1143                         DEFAULT(escseq.arg[1], term.row);
1144                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
1145                         tmoveto(0, 0);
1146                 }
1147                 break;
1148         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1149                 tcursor(CURSOR_SAVE);
1150                 break;
1151         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1152                 tcursor(CURSOR_LOAD);
1153                 break;
1154         }
1155 }
1156
1157 void
1158 csidump(void) {
1159         int i;
1160         printf("ESC [ %s", escseq.priv ? "? " : "");
1161         if(escseq.narg)
1162                 for(i = 0; i < escseq.narg; i++)
1163                         printf("%d ", escseq.arg[i]);
1164         if(escseq.mode)
1165                 putchar(escseq.mode);
1166         putchar('\n');
1167 }
1168
1169 void
1170 csireset(void) {
1171         memset(&escseq, 0, sizeof(escseq));
1172 }
1173
1174 void
1175 tputtab(void) {
1176         int space = TAB - term.c.x % TAB;
1177         tmoveto(term.c.x + space, term.c.y);
1178 }
1179
1180 void
1181 tputc(char *c) {
1182         char ascii = *c;
1183         if(term.esc & ESC_START) {
1184                 if(term.esc & ESC_CSI) {
1185                         escseq.buf[escseq.len++] = ascii;
1186                         if(BETWEEN(ascii, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
1187                                 term.esc = 0;
1188                                 csiparse(), csihandle();
1189                         }
1190                         /* TODO: handle other OSC */
1191                 } else if(term.esc & ESC_OSC) {
1192                         if(ascii == ';') {
1193                                 term.titlelen = 0;
1194                                 term.esc = ESC_START | ESC_TITLE;
1195                         }
1196                 } else if(term.esc & ESC_TITLE) {
1197                         if(ascii == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
1198                                 term.esc = 0;
1199                                 term.title[term.titlelen] = '\0';
1200                                 XStoreName(xw.dis, xw.win, term.title);
1201                         } else {
1202                                 term.title[term.titlelen++] = ascii;
1203                         }
1204                 } else if(term.esc & ESC_ALTCHARSET) {
1205                         switch(ascii) {
1206                         case '0': /* Line drawing crap */
1207                                 term.c.attr.mode |= ATTR_GFX;
1208                                 break;
1209                         case 'B': /* Back to regular text */
1210                                 term.c.attr.mode &= ~ATTR_GFX;
1211                                 break;
1212                         default:
1213                                 printf("esc unhandled charset: ESC ( %c\n", ascii);
1214                         }
1215                         term.esc = 0;
1216                 } else {
1217                         switch(ascii) {
1218                         case '[':
1219                                 term.esc |= ESC_CSI;
1220                                 break;
1221                         case ']':
1222                                 term.esc |= ESC_OSC;
1223                                 break;
1224                         case '(':
1225                                 term.esc |= ESC_ALTCHARSET;
1226                                 break;
1227                         case 'D': /* IND -- Linefeed */
1228                                 if(term.c.y == term.bot)
1229                                         tscrollup(term.top, 1);
1230                                 else
1231                                         tmoveto(term.c.x, term.c.y+1);
1232                                 term.esc = 0;
1233                                 break;
1234                         case 'E': /* NEL -- Next line */
1235                                 tnewline(1); /* always go to first col */
1236                                 term.esc = 0;
1237                                 break;
1238                         case 'M': /* RI -- Reverse index */
1239                                 if(term.c.y == term.top)
1240                                         tscrolldown(term.top, 1);
1241                                 else
1242                                         tmoveto(term.c.x, term.c.y-1);
1243                                 term.esc = 0;
1244                                 break;
1245                         case 'c': /* RIS -- Reset to inital state */
1246                                 treset();
1247                                 term.esc = 0;
1248                                 break;
1249                         case '=': /* DECPAM -- Application keypad */
1250                                 term.mode |= MODE_APPKEYPAD;
1251                                 term.esc = 0;
1252                                 break;
1253                         case '>': /* DECPNM -- Normal keypad */
1254                                 term.mode &= ~MODE_APPKEYPAD;
1255                                 term.esc = 0;
1256                                 break;
1257                         case '7': /* DECSC -- Save Cursor */
1258                                 tcursor(CURSOR_SAVE);
1259                                 term.esc = 0;
1260                                 break;
1261                         case '8': /* DECRC -- Restore Cursor */
1262                                 tcursor(CURSOR_LOAD);
1263                                 term.esc = 0;
1264                                 break;
1265                         default:
1266                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1267                                     (unsigned char) ascii, isprint(ascii)?ascii:'.');
1268                                 term.esc = 0;
1269                         }
1270                 }
1271         } else {
1272                 switch(ascii) {
1273                 case '\t':
1274                         tputtab();
1275                         break;
1276                 case '\b':
1277                         tmoveto(term.c.x-1, term.c.y);
1278                         break;
1279                 case '\r':
1280                         tmoveto(0, term.c.y);
1281                         break;
1282                 case '\f':
1283                 case '\v':
1284                 case '\n':
1285                         /* go to first col if the mode is set */
1286                         tnewline(IS_SET(MODE_CRLF));
1287                         break;
1288                 case '\a':
1289                         if(!(xw.state & WIN_FOCUSED))
1290                                 xseturgency(1);
1291                         break;
1292                 case '\033':
1293                         csireset();
1294                         term.esc = ESC_START;
1295                         break;
1296                 default:
1297                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1298                                 tnewline(1); /* always go to first col */
1299                         tsetchar(c);
1300                         if(term.c.x+1 < term.col)
1301                                 tmoveto(term.c.x+1, term.c.y);
1302                         else
1303                                 term.c.state |= CURSOR_WRAPNEXT;
1304                         break;
1305                 }
1306         }
1307 }
1308
1309 int
1310 tresize(int col, int row) {
1311         int i, x;
1312         int minrow = MIN(row, term.row);
1313         int mincol = MIN(col, term.col);
1314         int slide = term.c.y - row + 1;
1315
1316         if(col < 1 || row < 1)
1317                 return 0;
1318
1319         /* free unneeded rows */
1320         i = 0;
1321         if(slide > 0) {
1322                 /* slide screen to keep cursor where we expect it -
1323                  * tscrollup would work here, but we can optimize to
1324                  * memmove because we're freeing the earlier lines */
1325                 for(/* i = 0 */; i < slide; i++) {
1326                         free(term.line[i]);
1327                         free(term.alt[i]);
1328                 }
1329                 memmove(term.line, term.line + slide, row * sizeof(Line));
1330                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1331         }
1332         for(i += row; i < term.row; i++) {
1333                 free(term.line[i]);
1334                 free(term.alt[i]);
1335         }
1336
1337         /* resize to new height */
1338         term.line = realloc(term.line, row * sizeof(Line));
1339         term.alt  = realloc(term.alt,  row * sizeof(Line));
1340
1341         /* resize each row to new width, zero-pad if needed */
1342         for(i = 0; i < minrow; i++) {
1343                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1344                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1345                 for(x = mincol; x < col; x++) {
1346                         term.line[i][x].state = 0;
1347                         term.alt[i][x].state = 0;
1348                 }
1349         }
1350
1351         /* allocate any new rows */
1352         for(/* i == minrow */; i < row; i++) {
1353                 term.line[i] = calloc(col, sizeof(Glyph));
1354                 term.alt [i] = calloc(col, sizeof(Glyph));
1355         }
1356
1357         /* update terminal size */
1358         term.col = col, term.row = row;
1359         /* make use of the LIMIT in tmoveto */
1360         tmoveto(term.c.x, term.c.y);
1361         /* reset scrolling region */
1362         tsetscroll(0, row-1);
1363         return (slide > 0);
1364 }
1365
1366 void
1367 xresize(int col, int row) {
1368         Pixmap newbuf;
1369         int oldw, oldh;
1370
1371         oldw = xw.bufw;
1372         oldh = xw.bufh;
1373         xw.bufw = MAX(1, col * xw.cw);
1374         xw.bufh = MAX(1, row * xw.ch);
1375         newbuf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1376         XCopyArea(xw.dis, xw.buf, newbuf, dc.gc, 0, 0, xw.bufw, xw.bufh, 0, 0);
1377         XFreePixmap(xw.dis, xw.buf);
1378         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1379         if(xw.bufw > oldw)
1380                 XFillRectangle(xw.dis, newbuf, dc.gc, oldw, 0,
1381                                 xw.bufw-oldw, MIN(xw.bufh, oldh));
1382         else if(xw.bufw < oldw && (BORDER > 0 || xw.w > xw.bufw))
1383                 XClearArea(xw.dis, xw.win, BORDER+xw.bufw, BORDER,
1384                                 xw.w-xw.bufh-BORDER, BORDER+MIN(xw.bufh, oldh),
1385                                 False);
1386         if(xw.bufh > oldh)
1387                 XFillRectangle(xw.dis, newbuf, dc.gc, 0, oldh,
1388                                 xw.bufw, xw.bufh-oldh);
1389         else if(xw.bufh < oldh && (BORDER > 0 || xw.h > xw.bufh))
1390                 XClearArea(xw.dis, xw.win, BORDER, BORDER+xw.bufh,
1391                                 xw.w-2*BORDER, xw.h-xw.bufh-BORDER,
1392                                 False);
1393         xw.buf = newbuf;
1394 }
1395
1396 void
1397 xloadcols(void) {
1398         int i, r, g, b;
1399         XColor color;
1400         unsigned long white = WhitePixel(xw.dis, xw.scr);
1401
1402         for(i = 0; i < 16; i++) {
1403                 if (!XAllocNamedColor(xw.dis, xw.cmap, colorname[i], &color, &color)) {
1404                         dc.col[i] = white;
1405                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1406                 } else
1407                         dc.col[i] = color.pixel;
1408         }
1409
1410         /* same colors as xterm */
1411         for(r = 0; r < 6; r++)
1412                 for(g = 0; g < 6; g++)
1413                         for(b = 0; b < 6; b++) {
1414                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1415                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1416                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1417                                 if (!XAllocColor(xw.dis, xw.cmap, &color)) {
1418                                         dc.col[i] = white;
1419                                         fprintf(stderr, "Could not allocate color %d\n", i);
1420                                 } else
1421                                         dc.col[i] = color.pixel;
1422                                 i++;
1423                         }
1424
1425         for(r = 0; r < 24; r++, i++) {
1426                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1427                 if (!XAllocColor(xw.dis, xw.cmap, &color)) {
1428                         dc.col[i] = white;
1429                         fprintf(stderr, "Could not allocate color %d\n", i);
1430                 } else
1431                         dc.col[i] = color.pixel;
1432         }
1433 }
1434
1435 void
1436 xclear(int x1, int y1, int x2, int y2) {
1437         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1438         XFillRectangle(xw.dis, xw.buf, dc.gc,
1439                        x1 * xw.cw, y1 * xw.ch,
1440                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1441 }
1442
1443 void
1444 xhints(void)
1445 {
1446         XClassHint class = {TNAME, TNAME};
1447         XWMHints wm = {.flags = InputHint, .input = 1};
1448         XSizeHints size = {
1449                 .flags = PSize | PResizeInc | PBaseSize,
1450                 .height = xw.h,
1451                 .width = xw.w,
1452                 .height_inc = xw.ch,
1453                 .width_inc = xw.cw,
1454                 .base_height = 2*BORDER,
1455                 .base_width = 2*BORDER,
1456         };
1457         XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1458 }
1459
1460 void
1461 xsetfontinfo(FontInfo *fi)
1462 {
1463         XFontStruct **xfonts;
1464         int fnum;
1465         int i;
1466         char **fontnames;
1467
1468         fi->lbearing = 0;
1469         fi->rbearing = 0;
1470         fi->ascent = 0;
1471         fi->descent = 0;
1472         fnum = XFontsOfFontSet(fi->fs, &xfonts, &fontnames);
1473         for(i=0; i<fnum; i++,xfonts++,fontnames++) {
1474                 puts(*fontnames);
1475                 if(fi->ascent < (*xfonts)->ascent)
1476                         fi->ascent = (*xfonts)->ascent;
1477                 if(fi->descent < (*xfonts)->descent)
1478                         fi->descent = (*xfonts)->descent;
1479                 if(fi->rbearing < (*xfonts)->max_bounds.rbearing)
1480                         fi->rbearing = (*xfonts)->max_bounds.rbearing;
1481                 if(fi->lbearing < (*xfonts)->min_bounds.lbearing)
1482                         fi->lbearing = (*xfonts)->min_bounds.lbearing;
1483         }
1484 }
1485
1486 void
1487 xinit(void) {
1488         XSetWindowAttributes attrs;
1489         char **mc;
1490         char *ds;
1491         int nmc;
1492
1493         if(!(xw.dis = XOpenDisplay(NULL)))
1494                 die("Can't open display\n");
1495         xw.scr = XDefaultScreen(xw.dis);
1496
1497         /* font */
1498         if ((dc.font.fs = XCreateFontSet(xw.dis, FONT, &mc, &nmc, &ds)) == NULL ||
1499             (dc.bfont.fs = XCreateFontSet(xw.dis, BOLDFONT, &mc, &nmc, &ds)) == NULL)
1500                 die("Can't load font %s\n", dc.font.fs ? BOLDFONT : FONT);
1501         xsetfontinfo(&dc.font);
1502         xsetfontinfo(&dc.bfont);
1503
1504         /* XXX: Assuming same size for bold font */
1505         xw.cw = dc.font.rbearing - dc.font.lbearing;
1506         xw.ch = dc.font.ascent + dc.font.descent;
1507
1508         /* colors */
1509         xw.cmap = XDefaultColormap(xw.dis, xw.scr);
1510         xloadcols();
1511
1512         /* window - default size */
1513         xw.bufh = 24 * xw.ch;
1514         xw.bufw = 80 * xw.cw;
1515         xw.h = xw.bufh + 2*BORDER;
1516         xw.w = xw.bufw + 2*BORDER;
1517
1518         attrs.background_pixel = dc.col[DefaultBG];
1519         attrs.border_pixel = dc.col[DefaultBG];
1520         attrs.bit_gravity = NorthWestGravity;
1521         attrs.event_mask = FocusChangeMask | KeyPressMask
1522                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1523                 | PointerMotionMask | ButtonPressMask | ButtonReleaseMask;
1524         attrs.colormap = xw.cmap;
1525
1526         xw.win = XCreateWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1527                         xw.w, xw.h, 0, XDefaultDepth(xw.dis, xw.scr), InputOutput,
1528                         XDefaultVisual(xw.dis, xw.scr),
1529                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1530                         | CWColormap,
1531                         &attrs);
1532         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1533
1534
1535         /* input methods */
1536         xw.xim = XOpenIM(xw.dis, NULL, NULL, NULL);
1537         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1538                                            | XIMStatusNothing, XNClientWindow, xw.win,
1539                                            XNFocusWindow, xw.win, NULL);
1540         /* gc */
1541         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1542
1543         XMapWindow(xw.dis, xw.win);
1544         xhints();
1545         XStoreName(xw.dis, xw.win, opt_title ? opt_title : "st");
1546         XSync(xw.dis, 0);
1547 }
1548
1549 void
1550 xdraws(char *s, Glyph base, int x, int y, int cl, int sl) {
1551         unsigned long xfg, xbg;
1552         int winx = x*xw.cw, winy = y*xw.ch + dc.font.ascent, width = cl*xw.cw;
1553         int i;
1554
1555         if(base.mode & ATTR_REVERSE)
1556                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1557         else
1558                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1559
1560         XSetBackground(xw.dis, dc.gc, xbg);
1561         XSetForeground(xw.dis, dc.gc, xfg);
1562
1563         if(base.mode & ATTR_GFX)
1564                 for(i = 0; i < cl; i++) {
1565                         char c = gfx[(unsigned int)s[i] % 256];
1566                         if(c)
1567                                 s[i] = c;
1568                         else if(s[i] > 0x5f)
1569                                 s[i] -= 0x5f;
1570                 }
1571
1572         XmbDrawImageString(xw.dis, xw.buf, base.mode & ATTR_BOLD ? dc.bfont.fs : dc.font.fs,
1573             dc.gc, winx, winy, s, sl);
1574
1575         if(base.mode & ATTR_UNDERLINE)
1576                 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1577 }
1578
1579 void
1580 xdrawcursor(void) {
1581         static int oldx = 0;
1582         static int oldy = 0;
1583         int sl;
1584         Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
1585
1586         LIMIT(oldx, 0, term.col-1);
1587         LIMIT(oldy, 0, term.row-1);
1588
1589         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1590                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
1591
1592         /* remove the old cursor */
1593         if(term.line[oldy][oldx].state & GLYPH_SET) {
1594                 sl = slen(term.line[oldy][oldx].c);
1595                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
1596         } else
1597                 xclear(oldx, oldy, oldx, oldy);
1598
1599         /* draw the new one */
1600         if(!(term.c.state & CURSOR_HIDE) && (xw.state & WIN_FOCUSED)) {
1601                 sl = slen(g.c);
1602                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
1603                 oldx = term.c.x, oldy = term.c.y;
1604         }
1605 }
1606
1607 #ifdef DEBUG
1608 /* basic drawing routines */
1609 void
1610 xdrawc(int x, int y, Glyph g) {
1611         int sl = slen(g.c);
1612         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1613         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1614         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1615         XmbDrawImageString(xw.dis, xw.buf, g.mode&ATTR_BOLD?dc.bfont.fs:dc.font.fs,
1616             dc.gc, r.x, r.y+dc.font.ascent, g.c, sl);
1617 }
1618
1619 void
1620 draw(int dummy) {
1621         int x, y;
1622
1623         xclear(0, 0, term.col-1, term.row-1);
1624         for(y = 0; y < term.row; y++)
1625                 for(x = 0; x < term.col; x++)
1626                         if(term.line[y][x].state & GLYPH_SET)
1627                                 xdrawc(x, y, term.line[y][x]);
1628
1629         xdrawcursor();
1630         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1631         XFlush(xw.dis);
1632 }
1633
1634 #else
1635 /* optimized drawing routine */
1636 void
1637 draw(int redraw_all) {
1638         int ic, ib, x, y, ox, sl;
1639         Glyph base, new;
1640         char buf[DRAW_BUF_SIZ];
1641
1642         if(!(xw.state & WIN_VISIBLE))
1643                 return;
1644
1645         xclear(0, 0, term.col-1, term.row-1);
1646         for(y = 0; y < term.row; y++) {
1647                 base = term.line[y][0];
1648                 ic = ib = ox = 0;
1649                 for(x = 0; x < term.col; x++) {
1650                         new = term.line[y][x];
1651                         if(sel.bx!=-1 && *(new.c) && selected(x, y))
1652                                 new.mode ^= ATTR_REVERSE;
1653                         if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1654                                         ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
1655                                 xdraws(buf, base, ox, y, ic, ib);
1656                                 ic = ib = 0;
1657                         }
1658                         if(new.state & GLYPH_SET) {
1659                                 if(ib == 0) {
1660                                         ox = x;
1661                                         base = new;
1662                                 }
1663                                 sl = slen(new.c);
1664                                 memcpy(buf+ib, new.c, sl);
1665                                 ib += sl;
1666                                 ++ic;
1667                         }
1668                 }
1669                 if(ib > 0)
1670                         xdraws(buf, base, ox, y, ic, ib);
1671         }
1672         xdrawcursor();
1673         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1674 }
1675
1676 #endif
1677
1678 void
1679 expose(XEvent *ev) {
1680         XExposeEvent *e = &ev->xexpose;
1681         if(xw.state & WIN_REDRAW) {
1682                 if(!e->count) {
1683                         xw.state &= ~WIN_REDRAW;
1684                         draw(SCREEN_REDRAW);
1685                 }
1686         } else
1687                 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, e->x-BORDER, e->y-BORDER,
1688                                 e->width, e->height, e->x, e->y);
1689 }
1690
1691 void
1692 visibility(XEvent *ev) {
1693         XVisibilityEvent *e = &ev->xvisibility;
1694         if(e->state == VisibilityFullyObscured)
1695                 xw.state &= ~WIN_VISIBLE;
1696         else if(!(xw.state & WIN_VISIBLE))
1697                 /* need a full redraw for next Expose, not just a buf copy */
1698                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
1699 }
1700
1701 void
1702 unmap(XEvent *ev) {
1703         xw.state &= ~WIN_VISIBLE;
1704 }
1705
1706 void
1707 xseturgency(int add) {
1708         XWMHints *h = XGetWMHints(xw.dis, xw.win);
1709         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1710         XSetWMHints(xw.dis, xw.win, h);
1711         XFree(h);
1712 }
1713
1714 void
1715 focus(XEvent *ev) {
1716         if(ev->type == FocusIn) {
1717                 xw.state |= WIN_FOCUSED;
1718                 xseturgency(0);
1719         } else
1720                 xw.state &= ~WIN_FOCUSED;
1721         draw(SCREEN_UPDATE);
1722 }
1723
1724 char*
1725 kmap(KeySym k) {
1726         int i;
1727         for(i = 0; i < LEN(key); i++)
1728                 if(key[i].k == k)
1729                         return (char*)key[i].s;
1730         return NULL;
1731 }
1732
1733 void
1734 kpress(XEvent *ev) {
1735         XKeyEvent *e = &ev->xkey;
1736         KeySym ksym;
1737         char buf[32];
1738         char *customkey;
1739         int len;
1740         int meta;
1741         int shift;
1742         Status status;
1743
1744         meta = e->state & Mod1Mask;
1745         shift = e->state & ShiftMask;
1746         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
1747
1748         /* 1. custom keys from config.h */
1749         if((customkey = kmap(ksym)))
1750                 ttywrite(customkey, strlen(customkey));
1751         /* 2. hardcoded (overrides X lookup) */
1752         else
1753                 switch(ksym) {
1754                 case XK_Up:
1755                 case XK_Down:
1756                 case XK_Left:
1757                 case XK_Right:
1758                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1759                         ttywrite(buf, 3);
1760                         break;
1761                 case XK_Insert:
1762                         if(shift)
1763                                 selpaste();
1764                         break;
1765                 case XK_Return:
1766                         if(IS_SET(MODE_CRLF))
1767                                 ttywrite("\r\n", 2);
1768                         else
1769                                 ttywrite("\r", 1);
1770                         break;
1771                         /* 3. X lookup  */
1772                 default:
1773                         if(len > 0) {
1774                                 buf[sizeof(buf)-1] = '\0';
1775                                 if(meta && len == 1)
1776                                         ttywrite("\033", 1);
1777                                 ttywrite(buf, len);
1778                         } else /* 4. nothing to send */
1779                                 fprintf(stderr, "errkey: %d\n", (int)ksym);
1780                         break;
1781                 }
1782 }
1783
1784 void
1785 resize(XEvent *e) {
1786         int col, row;
1787
1788         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1789                 return;
1790
1791         xw.w = e->xconfigure.width;
1792         xw.h = e->xconfigure.height;
1793         col = (xw.w - 2*BORDER) / xw.cw;
1794         row = (xw.h - 2*BORDER) / xw.ch;
1795         if(col == term.col && row == term.row)
1796                 return;
1797         if(tresize(col, row))
1798                 draw(SCREEN_REDRAW);
1799         ttyresize(col, row);
1800         xresize(col, row);
1801 }
1802
1803 void
1804 run(void) {
1805         XEvent ev;
1806         fd_set rfd;
1807         int xfd = XConnectionNumber(xw.dis);
1808
1809         for(;;) {
1810                 FD_ZERO(&rfd);
1811                 FD_SET(cmdfd, &rfd);
1812                 FD_SET(xfd, &rfd);
1813                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1814                         if(errno == EINTR)
1815                                 continue;
1816                         die("select failed: %s\n", SERRNO);
1817                 }
1818                 if(FD_ISSET(cmdfd, &rfd)) {
1819                         ttyread();
1820                         draw(SCREEN_UPDATE);
1821                 }
1822                 while(XPending(xw.dis)) {
1823                         XNextEvent(xw.dis, &ev);
1824                         if (XFilterEvent(&ev, xw.win))
1825                                 continue;
1826                         if(handler[ev.type])
1827                                 (handler[ev.type])(&ev);
1828                 }
1829         }
1830 }
1831
1832 int
1833 main(int argc, char *argv[]) {
1834         int i;
1835
1836         for(i = 1; i < argc; i++) {
1837                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
1838                 case 't':
1839                         if(++i < argc) opt_title = argv[i];
1840                         break;
1841                 case 'e':
1842                         if(++i < argc) opt_cmd = argv[i];
1843                         break;
1844                 case 'v':
1845                 default:
1846                         die(USAGE);
1847                 }
1848         }
1849         setlocale(LC_CTYPE, "");
1850         tnew(80, 24);
1851         ttynew();
1852         xinit();
1853         selinit();
1854         run();
1855         return 0;
1856 }