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 <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <sys/ioctl.h>
  15 #include <sys/select.h>
  16 #include <sys/stat.h>
  17 #include <sys/time.h>
  18 #include <sys/types.h>
  19 #include <sys/wait.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <X11/Xatom.h>
  23 #include <X11/Xlib.h>
  24 #include <X11/Xutil.h>
  25 #include <X11/cursorfont.h>
  26 #include <X11/keysym.h>
  27 #include <X11/extensions/Xdbe.h>
  28
  29 #if   defined(__linux)
  30  #include <pty.h>
  31 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  32  #include <util.h>
  33 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  34  #include <libutil.h>
  35 #endif
  36
  37 #define USAGE \
  38         "st " VERSION " (c) 2010-2012 st engineers\n" \
  39         "usage: st [-t title] [-c class] [-g geometry]" \
  40         " [-w windowid] [-v] [-f file] [-e command...]\n"
  41
  42 /* XEMBED messages */
  43 #define XEMBED_FOCUS_IN  4
  44 #define XEMBED_FOCUS_OUT 5
  45
  46 /* Arbitrary sizes */
  47 #define ESC_BUF_SIZ   256
  48 #define ESC_ARG_SIZ   16
  49 #define STR_BUF_SIZ   256
  50 #define STR_ARG_SIZ   16
  51 #define DRAW_BUF_SIZ  1024
  52 #define UTF_SIZ       4
  53 #define XK_NO_MOD     UINT_MAX
  54 #define XK_ANY_MOD    0
  55
  56 #define SELECT_TIMEOUT (20*1000) /* 20 ms */
  57 #define DRAW_TIMEOUT  (20*1000) /* 20 ms */
  58 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  59
  60 #define SERRNO strerror(errno)
  61 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  62 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  63 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  64 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  65 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  66 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  67 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  68 #define IS_SET(flag) (term.mode & (flag))
  69 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  70 #define X2COL(x) (((x) - BORDER)/xw.cw)
  71 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
  72
  73 enum glyph_attribute {
  74         ATTR_NULL      = 0,
  75         ATTR_REVERSE   = 1,
  76         ATTR_UNDERLINE = 2,
  77         ATTR_BOLD      = 4,
  78         ATTR_GFX       = 8,
  79 };
  80
  81 enum cursor_movement {
  82         CURSOR_UP,
  83         CURSOR_DOWN,
  84         CURSOR_LEFT,
  85         CURSOR_RIGHT,
  86         CURSOR_SAVE,
  87         CURSOR_LOAD
  88 };
  89
  90 enum cursor_state {
  91         CURSOR_DEFAULT  = 0,
  92         CURSOR_HIDE     = 1,
  93         CURSOR_WRAPNEXT = 2
  94 };
  95
  96 enum glyph_state {
  97         GLYPH_SET   = 1,
  98         GLYPH_DIRTY = 2
  99 };
 100
 101 enum term_mode {
 102         MODE_WRAP       = 1,
 103         MODE_INSERT      = 2,
 104         MODE_APPKEYPAD   = 4,
 105         MODE_ALTSCREEN   = 8,
 106         MODE_CRLF       = 16,
 107         MODE_MOUSEBTN    = 32,
 108         MODE_MOUSEMOTION = 64,
 109         MODE_MOUSE       = 32|64,
 110         MODE_REVERSE     = 128
 111 };
 112
 113 enum escape_state {
 114         ESC_START      = 1,
 115         ESC_CSI = 2,
 116         ESC_STR = 4, /* DSC, OSC, PM, APC */
 117         ESC_ALTCHARSET = 8,
 118         ESC_STR_END    = 16, /* a final string was encountered */
 119 };
 120
 121 enum window_state {
 122         WIN_VISIBLE = 1,
 123         WIN_REDRAW  = 2,
 124         WIN_FOCUSED = 4
 125 };
 126
 127 /* bit macro */
 128 #undef B0
 129 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 130
 131 typedef unsigned char uchar;
 132 typedef unsigned int uint;
 133 typedef unsigned long ulong;
 134 typedef unsigned short ushort;
 135
 136 typedef struct {
 137         char c[UTF_SIZ];     /* character code */
 138         uchar mode;  /* attribute flags */
 139         ushort fg;   /* foreground  */
 140         ushort bg;   /* background  */
 141         uchar state; /* state flags    */
 142 } Glyph;
 143
 144 typedef Glyph* Line;
 145
 146 typedef struct {
 147         Glyph attr;      /* current char attributes */
 148         int x;
 149         int y;
 150         char state;
 151 } TCursor;
 152
 153 /* CSI Escape sequence structs */
 154 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 155 typedef struct {
 156         char buf[ESC_BUF_SIZ]; /* raw string */
 157         int len;               /* raw string length */
 158         char priv;
 159         int arg[ESC_ARG_SIZ];
 160         int narg;             /* nb of args */
 161         char mode;
 162 } CSIEscape;
 163
 164 /* STR Escape sequence structs */
 165 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 166 typedef struct {
 167         char type;           /* ESC type ... */
 168         char buf[STR_BUF_SIZ]; /* raw string */
 169         int len;               /* raw string length */
 170         char *args[STR_ARG_SIZ];
 171         int narg;             /* nb of args */
 172 } STREscape;
 173
 174 /* Internal representation of the screen */
 175 typedef struct {
 176         int row;        /* nb row */
 177         int col;        /* nb col */
 178         Line* line;     /* screen */
 179         Line* alt;      /* alternate screen */
 180         bool* dirty;    /* dirtyness of lines */
 181         TCursor c;      /* cursor */
 182         int top;        /* top    scroll limit */
 183         int bot;        /* bottom scroll limit */
 184         int mode;       /* terminal mode flags */
 185         int esc;        /* escape state flags */
 186         bool *tabs;
 187 } Term;
 188
 189 /* Purely graphic info */
 190 typedef struct {
 191         Display* dpy;
 192         Colormap cmap;
 193         Window win;
 194         XdbeBackBuffer buf;
 195         Atom xembed;
 196         XIM xim;
 197         XIC xic;
 198         int scr;
 199         Bool isfixed; /* is fixed geometry? */
 200         int fx, fy, fw, fh; /* fixed geometry */
 201         int w;  /* window width */
 202         int h;  /* window height */
 203         int ch; /* char height */
 204         int cw; /* char width  */
 205         char state; /* focus, redraw, visible */
 206         struct timeval lastdraw;
 207 } XWindow;
 208
 209 typedef struct {
 210         KeySym k;
 211         uint mask;
 212         char s[ESC_BUF_SIZ];
 213 } Key;
 214
 215
 216 /* TODO: use better name for vars... */
 217 typedef struct {
 218         int mode;
 219         int bx, by;
 220         int ex, ey;
 221         struct {int x, y;} b, e;
 222         char *clip;
 223         Atom xtarget;
 224         struct timeval tclick1;
 225         struct timeval tclick2;
 226 } Selection;
 227
 228 #include "config.h"
 229
 230 /* Drawing Context */
 231 typedef struct {
 232         ulong col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 233         GC gc;
 234         struct {
 235                 int ascent;
 236                 int descent;
 237                 short lbearing;
 238                 short rbearing;
 239                 XFontSet set;
 240         } font, bfont;
 241 } DC;
 242
 243 static void die(const char*, ...);
 244 static void draw(void);
 245 static void redraw(void);
 246 static void drawregion(int, int, int, int);
 247 static void execsh(void);
 248 static void sigchld(int);
 249 static void run(void);
 250 static bool last_draw_too_old(void);
 251
 252 static void csidump(void);
 253 static void csihandle(void);
 254 static void csiparse(void);
 255 static void csireset(void);
 256 static void strdump(void);
 257 static void strhandle(void);
 258 static void strparse(void);
 259 static void strreset(void);
 260
 261 static void tclearregion(int, int, int, int);
 262 static void tcursor(int);
 263 static void tdeletechar(int);
 264 static void tdeleteline(int);
 265 static void tinsertblank(int);
 266 static void tinsertblankline(int);
 267 static void tmoveto(int, int);
 268 static void tnew(int, int);
 269 static void tnewline(int);
 270 static void tputtab(bool);
 271 static void tputc(char*);
 272 static void treset(void);
 273 static int tresize(int, int);
 274 static void tscrollup(int, int);
 275 static void tscrolldown(int, int);
 276 static void tsetattr(int*, int);
 277 static void tsetchar(char*);
 278 static void tsetscroll(int, int);
 279 static void tswapscreen(void);
 280 static void tsetdirt(int, int);
 281 static void tsetmode(bool, bool, int *, int);
 282 static void tfulldirt(void);
 283
 284 static void ttynew(void);
 285 static void ttyread(void);
 286 static void ttyresize(int, int);
 287 static void ttywrite(const char *, size_t);
 288
 289 static void xdraws(char *, Glyph, int, int, int, int);
 290 static void xhints(void);
 291 static void xclear(int, int, int, int);
 292 static void xcopy();
 293 static void xdrawcursor(void);
 294 static void xinit(void);
 295 static void xloadcols(void);
 296 static void xseturgency(int);
 297 static void xsetsel(char*);
 298 static void xresize(int, int);
 299
 300 static void expose(XEvent *);
 301 static void visibility(XEvent *);
 302 static void unmap(XEvent *);
 303 static char* kmap(KeySym, uint);
 304 static void kpress(XEvent *);
 305 static void cmessage(XEvent *);
 306 static void resize(XEvent *);
 307 static void focus(XEvent *);
 308 static void brelease(XEvent *);
 309 static void bpress(XEvent *);
 310 static void bmotion(XEvent *);
 311 static void selnotify(XEvent *);
 312 static void selrequest(XEvent *);
 313
 314 static void selinit(void);
 315 static inline bool selected(int, int);
 316 static void selcopy(void);
 317 static void selpaste();
 318 static void selscroll(int, int);
 319
 320 static int utf8decode(char *, long *);
 321 static int utf8encode(long *, char *);
 322 static int utf8size(char *);
 323 static int isfullutf8(char *, int);
 324
 325 static void (*handler[LASTEvent])(XEvent *) = {
 326         [KeyPress] = kpress,
 327         [ClientMessage] = cmessage,
 328         [ConfigureNotify] = resize,
 329         [VisibilityNotify] = visibility,
 330         [UnmapNotify] = unmap,
 331         [Expose] = expose,
 332         [FocusIn] = focus,
 333         [FocusOut] = focus,
 334         [MotionNotify] = bmotion,
 335         [ButtonPress] = bpress,
 336         [ButtonRelease] = brelease,
 337         [SelectionNotify] = selnotify,
 338         [SelectionRequest] = selrequest,
 339 };
 340
 341 /* Globals */
 342 static DC dc;
 343 static XWindow xw;
 344 static Term term;
 345 static CSIEscape csiescseq;
 346 static STREscape strescseq;
 347 static int cmdfd;
 348 static pid_t pid;
 349 static Selection sel;
 350 static FILE *fileio;
 351 static char **opt_cmd  = NULL;
 352 static char *opt_io    = NULL;
 353 static char *opt_title = NULL;
 354 static char *opt_embed = NULL;
 355 static char *opt_class = NULL;
 356
 357 int
 358 utf8decode(char *s, long *u) {
 359         uchar c;
 360         int i, n, rtn;
 361
 362         rtn = 1;
 363         c = *s;
 364         if(~c & B7) { /* 0xxxxxxx */
 365                 *u = c;
 366                 return rtn;
 367         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 368                 *u = c&(B4|B3|B2|B1|B0);
 369                 n = 1;
 370         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 371                 *u = c&(B3|B2|B1|B0);
 372                 n = 2;
 373         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 374                 *u = c & (B2|B1|B0);
 375                 n = 3;
 376         } else
 377                 goto invalid;
 378         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 379                 c = *s;
 380                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 381                         goto invalid;
 382                 *u <<= 6;
 383                 *u |= c & (B5|B4|B3|B2|B1|B0);
 384         }
 385         if((n == 1 && *u < 0x80) ||
 386            (n == 2 && *u < 0x800) ||
 387            (n == 3 && *u < 0x10000) ||
 388            (*u >= 0xD800 && *u <= 0xDFFF))
 389                 goto invalid;
 390         return rtn;
 391 invalid:
 392         *u = 0xFFFD;
 393         return rtn;
 394 }
 395
 396 int
 397 utf8encode(long *u, char *s) {
 398         uchar *sp;
 399         ulong uc;
 400         int i, n;
 401
 402         sp = (uchar*) s;
 403         uc = *u;
 404         if(uc < 0x80) {
 405                 *sp = uc; /* 0xxxxxxx */
 406                 return 1;
 407         } else if(*u < 0x800) {
 408                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 409                 n = 1;
 410         } else if(uc < 0x10000) {
 411                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 412                 n = 2;
 413         } else if(uc <= 0x10FFFF) {
 414                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 415                 n = 3;
 416         } else {
 417                 goto invalid;
 418         }
 419         for(i=n,++sp; i>0; --i,++sp)
 420                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 421         return n+1;
 422 invalid:
 423         /* U+FFFD */
 424         *s++ = '\xEF';
 425         *s++ = '\xBF';
 426         *s = '\xBD';
 427         return 3;
 428 }
 429
 430 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 431    UTF-8 otherwise return 0 */
 432 int
 433 isfullutf8(char *s, int b) {
 434         uchar *c1, *c2, *c3;
 435
 436         c1 = (uchar *) s;
 437         c2 = (uchar *) ++s;
 438         c3 = (uchar *) ++s;
 439         if(b < 1)
 440                 return 0;
 441         else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
 442                 return 0;
 443         else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 444             ((b == 1) ||
 445             ((b == 2) && (*c2&(B7|B6)) == B7)))
 446                 return 0;
 447         else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 448             ((b == 1) ||
 449             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 450             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
 451                 return 0;
 452         else
 453                 return 1;
 454 }
 455
 456 int
 457 utf8size(char *s) {
 458         uchar c = *s;
 459
 460         if(~c&B7)
 461                 return 1;
 462         else if((c&(B7|B6|B5)) == (B7|B6))
 463                 return 2;
 464         else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
 465                 return 3;
 466         else
 467                 return 4;
 468 }
 469
 470 void
 471 selinit(void) {
 472         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 473         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 474         sel.mode = 0;
 475         sel.bx = -1;
 476         sel.clip = NULL;
 477         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 478         if(sel.xtarget == None)
 479                 sel.xtarget = XA_STRING;
 480 }
 481
 482 static inline bool
 483 selected(int x, int y) {
 484         if(sel.ey == y && sel.by == y) {
 485                 int bx = MIN(sel.bx, sel.ex);
 486                 int ex = MAX(sel.bx, sel.ex);
 487                 return BETWEEN(x, bx, ex);
 488         }
 489         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 490                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 491 }
 492
 493 void
 494 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 495         if(b)
 496                 *b = e->xbutton.button;
 497
 498         *x = X2COL(e->xbutton.x);
 499         *y = Y2ROW(e->xbutton.y);
 500         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 501         sel.b.y = MIN(sel.by, sel.ey);
 502         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 503         sel.e.y = MAX(sel.by, sel.ey);
 504 }
 505
 506 void
 507 mousereport(XEvent *e) {
 508         int x = X2COL(e->xbutton.x);
 509         int y = Y2ROW(e->xbutton.y);
 510         int button = e->xbutton.button;
 511         int state = e->xbutton.state;
 512         char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
 513         static int ob, ox, oy;
 514
 515         /* from urxvt */
 516         if(e->xbutton.type == MotionNotify) {
 517                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 518                         return;
 519                 button = ob + 32;
 520                 ox = x, oy = y;
 521         } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
 522                 button = 3;
 523         } else {
 524                 button -= Button1;
 525                 if(button >= 3)
 526                         button += 64 - 3;
 527                 if(e->xbutton.type == ButtonPress) {
 528                         ob = button;
 529                         ox = x, oy = y;
 530                 }
 531         }
 532
 533         buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
 534                 + (state & Mod4Mask    ? 8  : 0)
 535                 + (state & ControlMask ? 16 : 0);
 536
 537         ttywrite(buf, sizeof(buf));
 538 }
 539
 540 void
 541 bpress(XEvent *e) {
 542         if(IS_SET(MODE_MOUSE))
 543                 mousereport(e);
 544         else if(e->xbutton.button == Button1) {
 545                 if(sel.bx != -1)
 546                         tsetdirt(sel.b.y, sel.e.y);
 547                 sel.mode = 1;
 548                 sel.ex = sel.bx = X2COL(e->xbutton.x);
 549                 sel.ey = sel.by = Y2ROW(e->xbutton.y);
 550         }
 551 }
 552
 553 void
 554 selcopy(void) {
 555         char *str, *ptr;
 556         int x, y, bufsize, is_selected = 0;
 557
 558         if(sel.bx == -1)
 559                 str = NULL;
 560
 561         else {
 562                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 563                 ptr = str = malloc(bufsize);
 564
 565                 /* append every set & selected glyph to the selection */
 566                 for(y = 0; y < term.row; y++) {
 567                         for(x = 0; x < term.col; x++) {
 568                                 is_selected = selected(x, y);
 569                                 if((term.line[y][x].state & GLYPH_SET) && is_selected) {
 570                                         int size = utf8size(term.line[y][x].c);
 571                                         memcpy(ptr, term.line[y][x].c, size);
 572                                         ptr += size;
 573                                 }
 574                         }
 575
 576                         /* \n at the end of every selected line except for the last one */
 577                         if(is_selected && y < sel.e.y)
 578                                 *ptr++ = '\n';
 579                 }
 580                 *ptr = 0;
 581         }
 582         xsetsel(str);
 583 }
 584
 585 void
 586 selnotify(XEvent *e) {
 587         ulong nitems, ofs, rem;
 588         int format;
 589         uchar *data;
 590         Atom type;
 591
 592         ofs = 0;
 593         do {
 594                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 595                                         False, AnyPropertyType, &type, &format,
 596                                         &nitems, &rem, &data)) {
 597                         fprintf(stderr, "Clipboard allocation failed\n");
 598                         return;
 599                 }
 600                 ttywrite((const char *) data, nitems * format / 8);
 601                 XFree(data);
 602                 /* number of 32-bit chunks returned */
 603                 ofs += nitems * format / 32;
 604         } while(rem > 0);
 605 }
 606
 607 void
 608 selpaste() {
 609         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
 610 }
 611
 612 void
 613 selrequest(XEvent *e) {
 614         XSelectionRequestEvent *xsre;
 615         XSelectionEvent xev;
 616         Atom xa_targets;
 617
 618         xsre = (XSelectionRequestEvent *) e;
 619         xev.type = SelectionNotify;
 620         xev.requestor = xsre->requestor;
 621         xev.selection = xsre->selection;
 622         xev.target = xsre->target;
 623         xev.time = xsre->time;
 624         /* reject */
 625         xev.property = None;
 626
 627         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 628         if(xsre->target == xa_targets) {
 629                 /* respond with the supported type */
 630                 Atom string = sel.xtarget;
 631                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 632                                 XA_ATOM, 32, PropModeReplace,
 633                                 (uchar *) &string, 1);
 634                 xev.property = xsre->property;
 635         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 636                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 637                                 xsre->target, 8, PropModeReplace,
 638                                 (uchar *) sel.clip, strlen(sel.clip));
 639                 xev.property = xsre->property;
 640         }
 641
 642         /* all done, send a notification to the listener */
 643         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 644                 fprintf(stderr, "Error sending SelectionNotify event\n");
 645 }
 646
 647 void
 648 xsetsel(char *str) {
 649         /* register the selection for both the clipboard and the primary */
 650         Atom clipboard;
 651
 652         free(sel.clip);
 653         sel.clip = str;
 654
 655         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 656
 657         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 658         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 659
 660         XFlush(xw.dpy);
 661 }
 662
 663 void
 664 brelease(XEvent *e) {
 665         if(IS_SET(MODE_MOUSE)) {
 666                 mousereport(e);
 667                 return;
 668         }
 669         if(e->xbutton.button == Button2)
 670                 selpaste();
 671         else if(e->xbutton.button == Button1) {
 672                 sel.mode = 0;
 673                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 674                 term.dirty[sel.ey] = 1;
 675                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 676                         struct timeval now;
 677                         sel.bx = -1;
 678                         gettimeofday(&now, NULL);
 679
 680                         if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
 681                                 /* triple click on the line */
 682                                 sel.b.x = sel.bx = 0;
 683                                 sel.e.x = sel.ex = term.col;
 684                                 sel.b.y = sel.e.y = sel.ey;
 685                                 selcopy();
 686                         } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
 687                                 /* double click to select word */
 688                                 sel.bx = sel.ex;
 689                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 690                                           term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
 691                                 sel.b.x = sel.bx;
 692                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 693                                           term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
 694                                 sel.e.x = sel.ex;
 695                                 sel.b.y = sel.e.y = sel.ey;
 696                                 selcopy();
 697                         }
 698                 } else
 699                         selcopy();
 700         }
 701         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 702         gettimeofday(&sel.tclick1, NULL);
 703         draw();
 704 }
 705
 706 void
 707 bmotion(XEvent *e) {
 708         if(IS_SET(MODE_MOUSE)) {
 709                 mousereport(e);
 710                 return;
 711         }
 712         if(sel.mode) {
 713                 int oldey = sel.ey, oldex = sel.ex;
 714                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 715
 716                 if(oldey != sel.ey || oldex != sel.ex) {
 717                         int starty = MIN(oldey, sel.ey);
 718                         int endy = MAX(oldey, sel.ey);
 719                         tsetdirt(starty, endy);
 720                         draw();
 721                 }
 722         }
 723 }
 724
 725 void
 726 die(const char *errstr, ...) {
 727         va_list ap;
 728
 729         va_start(ap, errstr);
 730         vfprintf(stderr, errstr, ap);
 731         va_end(ap);
 732         exit(EXIT_FAILURE);
 733 }
 734
 735 void
 736 execsh(void) {
 737         char **args;
 738         char *envshell = getenv("SHELL");
 739
 740         DEFAULT(envshell, SHELL);
 741         putenv("TERM="TNAME);
 742         args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
 743         execvp(args[0], args);
 744         exit(EXIT_FAILURE);
 745 }
 746
 747 void
 748 sigchld(int a) {
 749         int stat = 0;
 750         if(waitpid(pid, &stat, 0) < 0)
 751                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 752         if(WIFEXITED(stat))
 753                 exit(WEXITSTATUS(stat));
 754         else
 755                 exit(EXIT_FAILURE);
 756 }
 757
 758 void
 759 ttynew(void) {
 760         int m, s;
 761
 762         /* seems to work fine on linux, openbsd and freebsd */
 763         struct winsize w = {term.row, term.col, 0, 0};
 764         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 765                 die("openpty failed: %s\n", SERRNO);
 766
 767         switch(pid = fork()) {
 768         case -1:
 769                 die("fork failed\n");
 770                 break;
 771         case 0:
 772                 setsid(); /* create a new process group */
 773                 dup2(s, STDIN_FILENO);
 774                 dup2(s, STDOUT_FILENO);
 775                 dup2(s, STDERR_FILENO);
 776                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 777                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 778                 close(s);
 779                 close(m);
 780                 execsh();
 781                 break;
 782         default:
 783                 close(s);
 784                 cmdfd = m;
 785                 signal(SIGCHLD, sigchld);
 786                 if (opt_io && !(fileio = fopen(opt_io, "w"))) {
 787                         fprintf(stderr, "Error opening %s:%s",
 788                                 opt_io, strerror(errno));
 789                 }
 790         }
 791 }
 792
 793 void
 794 dump(char c) {
 795         static int col;
 796         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 797         if(++col % 10 == 0)
 798                 fprintf(stderr, "\n");
 799 }
 800
 801 void
 802 ttyread(void) {
 803         static char buf[BUFSIZ];
 804         static int buflen = 0;
 805         char *ptr;
 806         char s[UTF_SIZ];
 807         int charsize; /* size of utf8 char in bytes */
 808         long utf8c;
 809         int ret;
 810
 811         /* append read bytes to unprocessed bytes */
 812         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 813                 die("Couldn't read from shell: %s\n", SERRNO);
 814
 815         /* process every complete utf8 char */
 816         buflen += ret;
 817         ptr = buf;
 818         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
 819                 charsize = utf8decode(ptr, &utf8c);
 820                 utf8encode(&utf8c, s);
 821                 tputc(s);
 822                 ptr    += charsize;
 823                 buflen -= charsize;
 824         }
 825
 826         /* keep any uncomplete utf8 char for the next call */
 827         memmove(buf, ptr, buflen);
 828 }
 829
 830 void
 831 ttywrite(const char *s, size_t n) {
 832         if(write(cmdfd, s, n) == -1)
 833                 die("write error on tty: %s\n", SERRNO);
 834 }
 835
 836 void
 837 ttyresize(int x, int y) {
 838         struct winsize w;
 839
 840         w.ws_row = term.row;
 841         w.ws_col = term.col;
 842         w.ws_xpixel = w.ws_ypixel = 0;
 843         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 844                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 845 }
 846
 847 void
 848 tsetdirt(int top, int bot)
 849 {
 850         int i;
 851
 852         LIMIT(top, 0, term.row-1);
 853         LIMIT(bot, 0, term.row-1);
 854
 855         for(i = top; i <= bot; i++)
 856                 term.dirty[i] = 1;
 857 }
 858
 859 void
 860 tfulldirt(void)
 861 {
 862         tsetdirt(0, term.row-1);
 863 }
 864
 865 void
 866 tcursor(int mode) {
 867         static TCursor c;
 868
 869         if(mode == CURSOR_SAVE)
 870                 c = term.c;
 871         else if(mode == CURSOR_LOAD)
 872                 term.c = c, tmoveto(c.x, c.y);
 873 }
 874
 875 void
 876 treset(void) {
 877         unsigned i;
 878         term.c = (TCursor){{
 879                 .mode = ATTR_NULL,
 880                 .fg = DefaultFG,
 881                 .bg = DefaultBG
 882         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 883
 884         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 885         for (i = TAB; i < term.col; i += TAB)
 886                 term.tabs[i] = 1;
 887         term.top = 0, term.bot = term.row - 1;
 888         term.mode = MODE_WRAP;
 889         tclearregion(0, 0, term.col-1, term.row-1);
 890 }
 891
 892 void
 893 tnew(int col, int row) {
 894         /* set screen size */
 895         term.row = row, term.col = col;
 896         term.line = malloc(term.row * sizeof(Line));
 897         term.alt  = malloc(term.row * sizeof(Line));
 898         term.dirty = malloc(term.row * sizeof(*term.dirty));
 899         term.tabs = malloc(term.col * sizeof(*term.tabs));
 900
 901         for(row = 0; row < term.row; row++) {
 902                 term.line[row] = malloc(term.col * sizeof(Glyph));
 903                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 904                 term.dirty[row] = 0;
 905         }
 906         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 907         /* setup screen */
 908         treset();
 909 }
 910
 911 void
 912 tswapscreen(void) {
 913         Line* tmp = term.line;
 914         term.line = term.alt;
 915         term.alt = tmp;
 916         term.mode ^= MODE_ALTSCREEN;
 917         tfulldirt();
 918 }
 919
 920 void
 921 tscrolldown(int orig, int n) {
 922         int i;
 923         Line temp;
 924
 925         LIMIT(n, 0, term.bot-orig+1);
 926
 927         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 928
 929         for(i = term.bot; i >= orig+n; i--) {
 930                 temp = term.line[i];
 931                 term.line[i] = term.line[i-n];
 932                 term.line[i-n] = temp;
 933
 934                 term.dirty[i] = 1;
 935                 term.dirty[i-n] = 1;
 936         }
 937
 938         selscroll(orig, n);
 939 }
 940
 941 void
 942 tscrollup(int orig, int n) {
 943         int i;
 944         Line temp;
 945         LIMIT(n, 0, term.bot-orig+1);
 946
 947         tclearregion(0, orig, term.col-1, orig+n-1);
 948
 949         for(i = orig; i <= term.bot-n; i++) {
 950                  temp = term.line[i];
 951                  term.line[i] = term.line[i+n];
 952                  term.line[i+n] = temp;
 953
 954                  term.dirty[i] = 1;
 955                  term.dirty[i+n] = 1;
 956         }
 957
 958         selscroll(orig, -n);
 959 }
 960
 961 void
 962 selscroll(int orig, int n) {
 963         if(sel.bx == -1)
 964                 return;
 965
 966         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
 967                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
 968                         sel.bx = -1;
 969                         return;
 970                 }
 971                 if(sel.by < term.top) {
 972                         sel.by = term.top;
 973                         sel.bx = 0;
 974                 }
 975                 if(sel.ey > term.bot) {
 976                         sel.ey = term.bot;
 977                         sel.ex = term.col;
 978                 }
 979                 sel.b.y = sel.by, sel.b.x = sel.bx;
 980                 sel.e.y = sel.ey, sel.e.x = sel.ex;
 981         }
 982 }
 983
 984 void
 985 tnewline(int first_col) {
 986         int y = term.c.y;
 987         if(y == term.bot)
 988                 tscrollup(term.top, 1);
 989         else
 990                 y++;
 991         tmoveto(first_col ? 0 : term.c.x, y);
 992 }
 993
 994 void
 995 csiparse(void) {
 996         /* int noarg = 1; */
 997         char *p = csiescseq.buf;
 998
 999         csiescseq.narg = 0;
1000         if(*p == '?')
1001                 csiescseq.priv = 1, p++;
1002
1003         while(p < csiescseq.buf+csiescseq.len) {
1004                 while(isdigit(*p)) {
1005                         csiescseq.arg[csiescseq.narg] *= 10;
1006                         csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
1007                 }
1008                 if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ)
1009                         csiescseq.narg++, p++;
1010                 else {
1011                         csiescseq.mode = *p;
1012                         csiescseq.narg++;
1013                         return;
1014                 }
1015         }
1016 }
1017
1018 void
1019 tmoveto(int x, int y) {
1020         LIMIT(x, 0, term.col-1);
1021         LIMIT(y, 0, term.row-1);
1022         term.c.state &= ~CURSOR_WRAPNEXT;
1023         term.c.x = x;
1024         term.c.y = y;
1025 }
1026
1027 void
1028 tsetchar(char *c) {
1029         term.dirty[term.c.y] = 1;
1030         term.line[term.c.y][term.c.x] = term.c.attr;
1031         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
1032         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
1033 }
1034
1035 void
1036 tclearregion(int x1, int y1, int x2, int y2) {
1037         int x, y, temp;
1038
1039         if(x1 > x2)
1040                 temp = x1, x1 = x2, x2 = temp;
1041         if(y1 > y2)
1042                 temp = y1, y1 = y2, y2 = temp;
1043
1044         LIMIT(x1, 0, term.col-1);
1045         LIMIT(x2, 0, term.col-1);
1046         LIMIT(y1, 0, term.row-1);
1047         LIMIT(y2, 0, term.row-1);
1048
1049         for(y = y1; y <= y2; y++) {
1050                 term.dirty[y] = 1;
1051                 for(x = x1; x <= x2; x++)
1052                         term.line[y][x].state = 0;
1053         }
1054 }
1055
1056 void
1057 tdeletechar(int n) {
1058         int src = term.c.x + n;
1059         int dst = term.c.x;
1060         int size = term.col - src;
1061
1062         term.dirty[term.c.y] = 1;
1063
1064         if(src >= term.col) {
1065                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1066                 return;
1067         }
1068         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1069         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1070 }
1071
1072 void
1073 tinsertblank(int n) {
1074         int src = term.c.x;
1075         int dst = src + n;
1076         int size = term.col - dst;
1077
1078         term.dirty[term.c.y] = 1;
1079
1080         if(dst >= term.col) {
1081                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1082                 return;
1083         }
1084         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1085         tclearregion(src, term.c.y, dst - 1, term.c.y);
1086 }
1087
1088 void
1089 tinsertblankline(int n) {
1090         if(term.c.y < term.top || term.c.y > term.bot)
1091                 return;
1092
1093         tscrolldown(term.c.y, n);
1094 }
1095
1096 void
1097 tdeleteline(int n) {
1098         if(term.c.y < term.top || term.c.y > term.bot)
1099                 return;
1100
1101         tscrollup(term.c.y, n);
1102 }
1103
1104 void
1105 tsetattr(int *attr, int l) {
1106         int i;
1107
1108         for(i = 0; i < l; i++) {
1109                 switch(attr[i]) {
1110                 case 0:
1111                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
1112                         term.c.attr.fg = DefaultFG;
1113                         term.c.attr.bg = DefaultBG;
1114                         break;
1115                 case 1:
1116                         term.c.attr.mode |= ATTR_BOLD;
1117                         break;
1118                 case 3: /* enter standout (highlight) mode TODO: make it italic */
1119                         term.c.attr.mode |= ATTR_REVERSE;
1120                         break;
1121                 case 4:
1122                         term.c.attr.mode |= ATTR_UNDERLINE;
1123                         break;
1124                 case 7:
1125                         term.c.attr.mode |= ATTR_REVERSE;
1126                         break;
1127                 case 22:
1128                         term.c.attr.mode &= ~ATTR_BOLD;
1129                         break;
1130                 case 23: /* leave standout (highlight) mode TODO: make it italic */
1131                         term.c.attr.mode &= ~ATTR_REVERSE;
1132                         break;
1133                 case 24:
1134                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1135                         break;
1136                 case 27:
1137                         term.c.attr.mode &= ~ATTR_REVERSE;
1138                         break;
1139                 case 38:
1140                         if(i + 2 < l && attr[i + 1] == 5) {
1141                                 i += 2;
1142                                 if(BETWEEN(attr[i], 0, 255))
1143                                         term.c.attr.fg = attr[i];
1144                                 else
1145                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
1146                         }
1147                         else
1148                                 fprintf(stderr, "erresc(38): gfx attr %d unknown\n", attr[i]);
1149                         break;
1150                 case 39:
1151                         term.c.attr.fg = DefaultFG;
1152                         break;
1153                 case 48:
1154                         if(i + 2 < l && attr[i + 1] == 5) {
1155                                 i += 2;
1156                                 if(BETWEEN(attr[i], 0, 255))
1157                                         term.c.attr.bg = attr[i];
1158                                 else
1159                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
1160                         }
1161                         else
1162                                 fprintf(stderr, "erresc(48): gfx attr %d unknown\n", attr[i]);
1163                         break;
1164                 case 49:
1165                         term.c.attr.bg = DefaultBG;
1166                         break;
1167                 default:
1168                         if(BETWEEN(attr[i], 30, 37))
1169                                 term.c.attr.fg = attr[i] - 30;
1170                         else if(BETWEEN(attr[i], 40, 47))
1171                                 term.c.attr.bg = attr[i] - 40;
1172                         else if(BETWEEN(attr[i], 90, 97))
1173                                 term.c.attr.fg = attr[i] - 90 + 8;
1174                         else if(BETWEEN(attr[i], 100, 107))
1175                                 term.c.attr.fg = attr[i] - 100 + 8;
1176                         else
1177                                 fprintf(stderr, "erresc(default): gfx attr %d unknown\n", attr[i]), csidump();
1178                         break;
1179                 }
1180         }
1181 }
1182
1183 void
1184 tsetscroll(int t, int b) {
1185         int temp;
1186
1187         LIMIT(t, 0, term.row-1);
1188         LIMIT(b, 0, term.row-1);
1189         if(t > b) {
1190                 temp = t;
1191                 t = b;
1192                 b = temp;
1193         }
1194         term.top = t;
1195         term.bot = b;
1196 }
1197
1198 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1199
1200 void
1201 tsetmode(bool priv, bool set, int *args, int narg) {
1202         int *lim, mode;
1203
1204         for (lim = args + narg; args < lim; ++args) {
1205                 if(priv) {
1206                         switch(*args) {
1207                         case 1:
1208                                 MODBIT(term.mode, set, MODE_APPKEYPAD);
1209                                 break;
1210                         case 5: /* DECSCNM -- Reverve video */
1211                                 mode = term.mode;
1212                                 MODBIT(term.mode,set, MODE_REVERSE);
1213                                 if (mode != term.mode)
1214                                         redraw();
1215                                 break;
1216                         case 7:
1217                                 MODBIT(term.mode, set, MODE_WRAP);
1218                                 break;
1219                         case 20:
1220                                 MODBIT(term.mode, set, MODE_CRLF);
1221                                 break;
1222                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1223                                 break;
1224                         case 25:
1225                                 MODBIT(term.c.state, !set, CURSOR_HIDE);
1226                                 break;
1227                         case 1000: /* 1000,1002: enable xterm mouse report */
1228                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1229                                 break;
1230                         case 1002:
1231                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1232                                 break;
1233                         case 1049: /* = 1047 and 1048 */
1234                         case 47:
1235                         case 1047:
1236                                 if(IS_SET(MODE_ALTSCREEN))
1237                                         tclearregion(0, 0, term.col-1, term.row-1);
1238                                 if ((set && !IS_SET(MODE_ALTSCREEN)) ||
1239                                     (!set && IS_SET(MODE_ALTSCREEN))) {
1240                                             tswapscreen();
1241                                 }
1242                                 if (*args != 1049)
1243                                         break;
1244                                 /* pass through */
1245                         case 1048:
1246                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1247                                 break;
1248                         default:
1249                                 fprintf(stderr,
1250                                         "erresc: unknown private set/reset mode %d\n",
1251                                         *args);
1252                                 break;
1253                         }
1254                 } else {
1255                         switch(*args) {
1256                         case 4:
1257                                 MODBIT(term.mode, set, MODE_INSERT);
1258                                 break;
1259                         default:
1260                                 fprintf(stderr,
1261                                         "erresc: unknown set/reset mode %d\n",
1262                                         *args);
1263                                 break;
1264                         }
1265                 }
1266         }
1267 }
1268 #undef MODBIT
1269
1270
1271 void
1272 csihandle(void) {
1273         switch(csiescseq.mode) {
1274         default:
1275         unknown:
1276                 fprintf(stderr, "erresc: unknown csi ");
1277                 csidump();
1278                 /* die(""); */
1279                 break;
1280         case '@': /* ICH -- Insert <n> blank char */
1281                 DEFAULT(csiescseq.arg[0], 1);
1282                 tinsertblank(csiescseq.arg[0]);
1283                 break;
1284         case 'A': /* CUU -- Cursor <n> Up */
1285         case 'e':
1286                 DEFAULT(csiescseq.arg[0], 1);
1287                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1288                 break;
1289         case 'B': /* CUD -- Cursor <n> Down */
1290                 DEFAULT(csiescseq.arg[0], 1);
1291                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1292                 break;
1293         case 'C': /* CUF -- Cursor <n> Forward */
1294         case 'a':
1295                 DEFAULT(csiescseq.arg[0], 1);
1296                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1297                 break;
1298         case 'D': /* CUB -- Cursor <n> Backward */
1299                 DEFAULT(csiescseq.arg[0], 1);
1300                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1301                 break;
1302         case 'E': /* CNL -- Cursor <n> Down and first col */
1303                 DEFAULT(csiescseq.arg[0], 1);
1304                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1305                 break;
1306         case 'F': /* CPL -- Cursor <n> Up and first col */
1307                 DEFAULT(csiescseq.arg[0], 1);
1308                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1309                 break;
1310         case 'g': /* TBC -- Tabulation clear */
1311                 switch (csiescseq.arg[0]) {
1312                 case 0: /* clear current tab stop */
1313                         term.tabs[term.c.x] = 0;
1314                         break;
1315                 case 3: /* clear all the tabs */
1316                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1317                         break;
1318                 default:
1319                         goto unknown;
1320                 }
1321                 break;
1322         case 'G': /* CHA -- Move to <col> */
1323         case '`': /* XXX: HPA -- same? */
1324                 DEFAULT(csiescseq.arg[0], 1);
1325                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1326                 break;
1327         case 'H': /* CUP -- Move to <row> <col> */
1328         case 'f': /* XXX: HVP -- same? */
1329                 DEFAULT(csiescseq.arg[0], 1);
1330                 DEFAULT(csiescseq.arg[1], 1);
1331                 tmoveto(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1332                 break;
1333         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1334                 DEFAULT(csiescseq.arg[0], 1);
1335                 while (csiescseq.arg[0]--)
1336                         tputtab(1);
1337                 break;
1338         case 'J': /* ED -- Clear screen */
1339                 sel.bx = -1;
1340                 switch(csiescseq.arg[0]) {
1341                 case 0: /* below */
1342                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1343                         if(term.c.y < term.row-1)
1344                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1345                         break;
1346                 case 1: /* above */
1347                         if(term.c.y > 1)
1348                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1349                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1350                         break;
1351                 case 2: /* all */
1352                         tclearregion(0, 0, term.col-1, term.row-1);
1353                         break;
1354                 default:
1355                         goto unknown;
1356                 }
1357                 break;
1358         case 'K': /* EL -- Clear line */
1359                 switch(csiescseq.arg[0]) {
1360                 case 0: /* right */
1361                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1362                         break;
1363                 case 1: /* left */
1364                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1365                         break;
1366                 case 2: /* all */
1367                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1368                         break;
1369                 }
1370                 break;
1371         case 'S': /* SU -- Scroll <n> line up */
1372                 DEFAULT(csiescseq.arg[0], 1);
1373                 tscrollup(term.top, csiescseq.arg[0]);
1374                 break;
1375         case 'T': /* SD -- Scroll <n> line down */
1376                 DEFAULT(csiescseq.arg[0], 1);
1377                 tscrolldown(term.top, csiescseq.arg[0]);
1378                 break;
1379         case 'L': /* IL -- Insert <n> blank lines */
1380                 DEFAULT(csiescseq.arg[0], 1);
1381                 tinsertblankline(csiescseq.arg[0]);
1382                 break;
1383         case 'l': /* RM -- Reset Mode */
1384                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1385                 break;
1386         case 'M': /* DL -- Delete <n> lines */
1387                 DEFAULT(csiescseq.arg[0], 1);
1388                 tdeleteline(csiescseq.arg[0]);
1389                 break;
1390         case 'X': /* ECH -- Erase <n> char */
1391                 DEFAULT(csiescseq.arg[0], 1);
1392                 tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
1393                 break;
1394         case 'P': /* DCH -- Delete <n> char */
1395                 DEFAULT(csiescseq.arg[0], 1);
1396                 tdeletechar(csiescseq.arg[0]);
1397                 break;
1398         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1399                 DEFAULT(csiescseq.arg[0], 1);
1400                 while (csiescseq.arg[0]--)
1401                         tputtab(0);
1402                 break;
1403         case 'd': /* VPA -- Move to <row> */
1404                 DEFAULT(csiescseq.arg[0], 1);
1405                 tmoveto(term.c.x, csiescseq.arg[0]-1);
1406                 break;
1407         case 'h': /* SM -- Set terminal mode */
1408                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1409                 break;
1410         case 'm': /* SGR -- Terminal attribute (color) */
1411                 tsetattr(csiescseq.arg, csiescseq.narg);
1412                 break;
1413         case 'r': /* DECSTBM -- Set Scrolling Region */
1414                 if(csiescseq.priv)
1415                         goto unknown;
1416                 else {
1417                         DEFAULT(csiescseq.arg[0], 1);
1418                         DEFAULT(csiescseq.arg[1], term.row);
1419                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1420                         tmoveto(0, 0);
1421                 }
1422                 break;
1423         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1424                 tcursor(CURSOR_SAVE);
1425                 break;
1426         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1427                 tcursor(CURSOR_LOAD);
1428                 break;
1429         }
1430 }
1431
1432 void
1433 csidump(void) {
1434         int i;
1435         printf("ESC[");
1436         for(i = 0; i < csiescseq.len; i++) {
1437                 uint c = csiescseq.buf[i] & 0xff;
1438                 if(isprint(c)) putchar(c);
1439                 else if(c == '\n') printf("(\\n)");
1440                 else if(c == '\r') printf("(\\r)");
1441                 else if(c == 0x1b) printf("(\\e)");
1442                 else printf("(%02x)", c);
1443         }
1444         putchar('\n');
1445 }
1446
1447 void
1448 csireset(void) {
1449         memset(&csiescseq, 0, sizeof(csiescseq));
1450 }
1451
1452 void
1453 strhandle(void) {
1454         char *p;
1455
1456         /*
1457          * TODO: make this being useful in case of color palette change.
1458          */
1459         strparse();
1460
1461         p = strescseq.buf;
1462
1463         switch(strescseq.type) {
1464         case ']': /* OSC -- Operating System Command */
1465                 switch(p[0]) {
1466                 case '0':
1467                 case '1':
1468                 case '2':
1469                         /*
1470                          * TODO: Handle special chars in string, like umlauts.
1471                          */
1472                         if(p[1] == ';') {
1473                                 XStoreName(xw.dpy, xw.win, strescseq.buf+2);
1474                         }
1475                         break;
1476                 case ';':
1477                         XStoreName(xw.dpy, xw.win, strescseq.buf+1);
1478                         break;
1479                 case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
1480                         break;
1481                 default:
1482                         fprintf(stderr, "erresc: unknown str ");
1483                         strdump();
1484                         break;
1485                 }
1486                 break;
1487         case 'P': /* DSC -- Device Control String */
1488         case '_': /* APC -- Application Program Command */
1489         case '^': /* PM -- Privacy Message */
1490         default:
1491                 fprintf(stderr, "erresc: unknown str ");
1492                 strdump();
1493                 /* die(""); */
1494                 break;
1495         }
1496 }
1497
1498 void
1499 strparse(void) {
1500         /*
1501          * TODO: Implement parsing like for CSI when required.
1502          * Format: ESC type cmd ';' arg0 [';' argn] ESC \
1503          */
1504         return;
1505 }
1506
1507 void
1508 strdump(void) {
1509         int i;
1510         printf("ESC%c", strescseq.type);
1511         for(i = 0; i < strescseq.len; i++) {
1512                 uint c = strescseq.buf[i] & 0xff;
1513                 if(isprint(c)) putchar(c);
1514                 else if(c == '\n') printf("(\\n)");
1515                 else if(c == '\r') printf("(\\r)");
1516                 else if(c == 0x1b) printf("(\\e)");
1517                 else printf("(%02x)", c);
1518         }
1519         printf("ESC\\\n");
1520 }
1521
1522 void
1523 strreset(void) {
1524         memset(&strescseq, 0, sizeof(strescseq));
1525 }
1526
1527 void
1528 tputtab(bool forward) {
1529         unsigned x = term.c.x;
1530
1531         if (forward) {
1532                 if (x == term.col)
1533                         return;
1534                 for (++x; x < term.col && !term.tabs[x]; ++x)
1535                         /* nothing */ ;
1536         } else {
1537                 if (x == 0)
1538                         return;
1539                 for (--x; x > 0 && !term.tabs[x]; --x)
1540                         /* nothing */ ;
1541         }
1542         tmoveto(x, term.c.y);
1543 }
1544
1545 void
1546 tputc(char *c) {
1547         char ascii = *c;
1548
1549         if (fileio)
1550                 putc(ascii, fileio);
1551         if(term.esc & ESC_START) {
1552                 if(term.esc & ESC_CSI) {
1553                         csiescseq.buf[csiescseq.len++] = ascii;
1554                         if(BETWEEN(ascii, 0x40, 0x7E) || csiescseq.len >= ESC_BUF_SIZ) {
1555                                 term.esc = 0;
1556                                 csiparse(), csihandle();
1557                         }
1558                 } else if(term.esc & ESC_STR) {
1559                         switch(ascii) {
1560                         case '\033':
1561                                 term.esc = ESC_START | ESC_STR_END;
1562                                 break;
1563                         case '\a': /* backwards compatibility to xterm */
1564                                 term.esc = 0;
1565                                 strhandle();
1566                                 break;
1567                         default:
1568                                 strescseq.buf[strescseq.len++] = ascii;
1569                                 if (strescseq.len+1 >= STR_BUF_SIZ) {
1570                                         term.esc = 0;
1571                                         strhandle();
1572                                 }
1573                         }
1574                 } else if(term.esc & ESC_STR_END) {
1575                         term.esc = 0;
1576                         if(ascii == '\\')
1577                                 strhandle();
1578                 } else if(term.esc & ESC_ALTCHARSET) {
1579                         switch(ascii) {
1580                         case '0': /* Line drawing crap */
1581                                 term.c.attr.mode |= ATTR_GFX;
1582                                 break;
1583                         case 'B': /* Back to regular text */
1584                                 term.c.attr.mode &= ~ATTR_GFX;
1585                                 break;
1586                         default:
1587                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1588                         }
1589                         term.esc = 0;
1590                 } else {
1591                         switch(ascii) {
1592                         case '[':
1593                                 term.esc |= ESC_CSI;
1594                                 break;
1595                         case 'P': /* DCS -- Device Control String */
1596                         case '_': /* APC -- Application Program Command */
1597                         case '^': /* PM -- Privacy Message */
1598                         case ']': /* OSC -- Operating System Command */
1599                                 strreset();
1600                                 strescseq.type = ascii;
1601                                 term.esc |= ESC_STR;
1602                                 break;
1603                         case '(':
1604                                 term.esc |= ESC_ALTCHARSET;
1605                                 break;
1606                         case 'D': /* IND -- Linefeed */
1607                                 if(term.c.y == term.bot)
1608                                         tscrollup(term.top, 1);
1609                                 else
1610                                         tmoveto(term.c.x, term.c.y+1);
1611                                 term.esc = 0;
1612                                 break;
1613                         case 'E': /* NEL -- Next line */
1614                                 tnewline(1); /* always go to first col */
1615                                 term.esc = 0;
1616                                 break;
1617                         case 'H': /* HTS -- Horizontal tab stop */
1618                                 term.tabs[term.c.x] = 1;
1619                                 term.esc = 0;
1620                                 break;
1621                         case 'M': /* RI -- Reverse index */
1622                                 if(term.c.y == term.top)
1623                                         tscrolldown(term.top, 1);
1624                                 else
1625                                         tmoveto(term.c.x, term.c.y-1);
1626                                 term.esc = 0;
1627                                 break;
1628                         case 'c': /* RIS -- Reset to inital state */
1629                                 treset();
1630                                 term.esc = 0;
1631                                 break;
1632                         case '=': /* DECPAM -- Application keypad */
1633                                 term.mode |= MODE_APPKEYPAD;
1634                                 term.esc = 0;
1635                                 break;
1636                         case '>': /* DECPNM -- Normal keypad */
1637                                 term.mode &= ~MODE_APPKEYPAD;
1638                                 term.esc = 0;
1639                                 break;
1640                         case '7': /* DECSC -- Save Cursor */
1641                                 tcursor(CURSOR_SAVE);
1642                                 term.esc = 0;
1643                                 break;
1644                         case '8': /* DECRC -- Restore Cursor */
1645                                 tcursor(CURSOR_LOAD);
1646                                 term.esc = 0;
1647                                 break;
1648                         case '\\': /* ST -- Stop */
1649                                 term.esc = 0;
1650                                 break;
1651                         default:
1652                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1653                                     (uchar) ascii, isprint(ascii)?ascii:'.');
1654                                 term.esc = 0;
1655                         }
1656                 }
1657         } else {
1658                 if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
1659                         sel.bx = -1;
1660                 switch(ascii) {
1661                 case '\t':
1662                         tputtab(1);
1663                         break;
1664                 case '\b':
1665                         tmoveto(term.c.x-1, term.c.y);
1666                         break;
1667                 case '\r':
1668                         tmoveto(0, term.c.y);
1669                         break;
1670                 case '\f':
1671                 case '\v':
1672                 case '\n':
1673                         /* go to first col if the mode is set */
1674                         tnewline(IS_SET(MODE_CRLF));
1675                         break;
1676                 case '\a':
1677                         if(!(xw.state & WIN_FOCUSED))
1678                                 xseturgency(1);
1679                         break;
1680                 case '\033':
1681                         csireset();
1682                         term.esc = ESC_START;
1683                         break;
1684                 default:
1685                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1686                                 tnewline(1); /* always go to first col */
1687                         tsetchar(c);
1688                         if(term.c.x+1 < term.col)
1689                                 tmoveto(term.c.x+1, term.c.y);
1690                         else
1691                                 term.c.state |= CURSOR_WRAPNEXT;
1692                 }
1693         }
1694 }
1695
1696 int
1697 tresize(int col, int row) {
1698         int i, x;
1699         int minrow = MIN(row, term.row);
1700         int mincol = MIN(col, term.col);
1701         int slide = term.c.y - row + 1;
1702
1703         if(col < 1 || row < 1)
1704                 return 0;
1705
1706         /* free unneeded rows */
1707         i = 0;
1708         if(slide > 0) {
1709                 /* slide screen to keep cursor where we expect it -
1710                  * tscrollup would work here, but we can optimize to
1711                  * memmove because we're freeing the earlier lines */
1712                 for(/* i = 0 */; i < slide; i++) {
1713                         free(term.line[i]);
1714                         free(term.alt[i]);
1715                 }
1716                 memmove(term.line, term.line + slide, row * sizeof(Line));
1717                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1718         }
1719         for(i += row; i < term.row; i++) {
1720                 free(term.line[i]);
1721                 free(term.alt[i]);
1722         }
1723
1724         /* resize to new height */
1725         term.line = realloc(term.line, row * sizeof(Line));
1726         term.alt  = realloc(term.alt,  row * sizeof(Line));
1727         term.dirty = realloc(term.dirty, row * sizeof(*term.dirty));
1728         term.tabs = realloc(term.tabs, col * sizeof(*term.tabs));
1729
1730         /* resize each row to new width, zero-pad if needed */
1731         for(i = 0; i < minrow; i++) {
1732                 term.dirty[i] = 1;
1733                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1734                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1735                 for(x = mincol; x < col; x++) {
1736                         term.line[i][x].state = 0;
1737                         term.alt[i][x].state = 0;
1738                 }
1739         }
1740
1741         /* allocate any new rows */
1742         for(/* i == minrow */; i < row; i++) {
1743                 term.dirty[i] = 1;
1744                 term.line[i] = calloc(col, sizeof(Glyph));
1745                 term.alt [i] = calloc(col, sizeof(Glyph));
1746         }
1747         if (col > term.col) {
1748                 bool *bp = term.tabs + term.col;
1749
1750                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
1751                 while (--bp > term.tabs && !*bp)
1752                         /* nothing */ ;
1753                 for (bp += TAB; bp < term.tabs + col; bp += TAB)
1754                         *bp = 1;
1755         }
1756         /* update terminal size */
1757         term.col = col, term.row = row;
1758         /* make use of the LIMIT in tmoveto */
1759         tmoveto(term.c.x, term.c.y);
1760         /* reset scrolling region */
1761         tsetscroll(0, row-1);
1762
1763         return (slide > 0);
1764 }
1765
1766 void
1767 xresize(int col, int row) {
1768         xw.w = MAX(1, 2*BORDER + col * xw.cw);
1769         xw.h = MAX(1, 2*BORDER + row * xw.ch);
1770 }
1771
1772 void
1773 xloadcols(void) {
1774         int i, r, g, b;
1775         XColor color;
1776         ulong white = WhitePixel(xw.dpy, xw.scr);
1777
1778         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
1779         for(i = 0; i < LEN(colorname); i++) {
1780                 if(!colorname[i])
1781                         continue;
1782                 if(!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1783                         dc.col[i] = white;
1784                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1785                 } else
1786                         dc.col[i] = color.pixel;
1787         }
1788
1789         /* load colors [16-255] ; same colors as xterm */
1790         for(i = 16, r = 0; r < 6; r++)
1791                 for(g = 0; g < 6; g++)
1792                         for(b = 0; b < 6; b++) {
1793                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1794                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1795                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1796                                 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1797                                         dc.col[i] = white;
1798                                         fprintf(stderr, "Could not allocate color %d\n", i);
1799                                 } else
1800                                         dc.col[i] = color.pixel;
1801                                 i++;
1802                         }
1803
1804         for(r = 0; r < 24; r++, i++) {
1805                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1806                 if (!XAllocColor(xw.dpy, xw.cmap, &color)) {
1807                         dc.col[i] = white;
1808                         fprintf(stderr, "Could not allocate color %d\n", i);
1809                 } else
1810                         dc.col[i] = color.pixel;
1811         }
1812 }
1813
1814 void
1815 xclear(int x1, int y1, int x2, int y2) {
1816         XSetForeground(xw.dpy, dc.gc, dc.col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG]);
1817         XFillRectangle(xw.dpy, xw.buf, dc.gc,
1818                        BORDER + x1 * xw.cw, BORDER + y1 * xw.ch,
1819                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1820 }
1821
1822 void
1823 xhints(void) {
1824         XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1825         XWMHints wm = {.flags = InputHint, .input = 1};
1826         XSizeHints *sizeh = NULL;
1827
1828         sizeh = XAllocSizeHints();
1829         if(xw.isfixed == False) {
1830                 sizeh->flags = PSize | PResizeInc | PBaseSize;
1831                 sizeh->height = xw.h;
1832                 sizeh->width = xw.w;
1833                 sizeh->height_inc = xw.ch;
1834                 sizeh->width_inc = xw.cw;
1835                 sizeh->base_height = 2*BORDER;
1836                 sizeh->base_width = 2*BORDER;
1837         } else {
1838                 sizeh->flags = PMaxSize | PMinSize;
1839                 sizeh->min_width = sizeh->max_width = xw.fw;
1840                 sizeh->min_height = sizeh->max_height = xw.fh;
1841         }
1842
1843         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
1844         XFree(sizeh);
1845 }
1846
1847 XFontSet
1848 xinitfont(char *fontstr) {
1849         XFontSet set;
1850         char *def, **missing;
1851         int n;
1852
1853         missing = NULL;
1854         set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1855         if(missing) {
1856                 while(n--)
1857                         fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1858                 XFreeStringList(missing);
1859         }
1860         return set;
1861 }
1862
1863 void
1864 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing) {
1865         XFontStruct **xfonts;
1866         char **font_names;
1867         int i, n;
1868
1869         *ascent = *descent = *lbearing = *rbearing = 0;
1870         n = XFontsOfFontSet(set, &xfonts, &font_names);
1871         for(i = 0; i < n; i++) {
1872                 *ascent = MAX(*ascent, (*xfonts)->ascent);
1873                 *descent = MAX(*descent, (*xfonts)->descent);
1874                 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1875                 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1876                 xfonts++;
1877         }
1878 }
1879
1880 void
1881 initfonts(char *fontstr, char *bfontstr) {
1882         if((dc.font.set = xinitfont(fontstr)) == NULL ||
1883            (dc.bfont.set = xinitfont(bfontstr)) == NULL)
1884                 die("Can't load font %s\n", dc.font.set ? BOLDFONT : FONT);
1885         xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1886             &dc.font.lbearing, &dc.font.rbearing);
1887         xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1888             &dc.bfont.lbearing, &dc.bfont.rbearing);
1889 }
1890
1891 void
1892 xinit(void) {
1893         XSetWindowAttributes attrs;
1894         Cursor cursor;
1895         Window parent;
1896         int sw, sh;
1897
1898         if(!(xw.dpy = XOpenDisplay(NULL)))
1899                 die("Can't open display\n");
1900         xw.scr = XDefaultScreen(xw.dpy);
1901
1902         /* adjust fixed window geometry */
1903         if(xw.isfixed) {
1904                 sw = DisplayWidth(xw.dpy, xw.scr);
1905                 sh = DisplayWidth(xw.dpy, xw.scr);
1906                 if(xw.fx < 0)
1907                         xw.fx = sw + xw.fx - xw.fw;
1908                 if(xw.fy < 0)
1909                         xw.fy = sh + xw.fy - xw.fh;
1910         } else {
1911                 /* window - default size */
1912                 xw.h = 2*BORDER + term.row * xw.ch;
1913                 xw.w = 2*BORDER + term.col * xw.cw;
1914                 xw.fw = xw.w;
1915                 xw.fh = xw.h;
1916         }
1917
1918         /* font */
1919         initfonts(FONT, BOLDFONT);
1920
1921         /* XXX: Assuming same size for bold font */
1922         xw.cw = dc.font.rbearing - dc.font.lbearing;
1923         xw.ch = dc.font.ascent + dc.font.descent;
1924
1925         /* colors */
1926         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1927         xloadcols();
1928
1929         attrs.background_pixel = dc.col[DefaultBG];
1930         attrs.border_pixel = dc.col[DefaultBG];
1931         attrs.bit_gravity = NorthWestGravity;
1932         attrs.event_mask = FocusChangeMask | KeyPressMask
1933                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1934                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask
1935                 | EnterWindowMask | LeaveWindowMask;
1936         attrs.colormap = xw.cmap;
1937
1938         parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
1939         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
1940                         xw.fw, xw.fh, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
1941                         XDefaultVisual(xw.dpy, xw.scr),
1942                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1943                         | CWColormap,
1944                         &attrs);
1945         xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
1946
1947
1948         /* input methods */
1949         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1950         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1951                                            | XIMStatusNothing, XNClientWindow, xw.win,
1952                                            XNFocusWindow, xw.win, NULL);
1953         /* gc */
1954         dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
1955
1956         /* white cursor, black outline */
1957         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
1958         XDefineCursor(xw.dpy, xw.win, cursor);
1959         XRecolorCursor(xw.dpy, cursor,
1960                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
1961                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
1962
1963         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
1964
1965         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
1966         XMapWindow(xw.dpy, xw.win);
1967         xhints();
1968         XSync(xw.dpy, 0);
1969 }
1970
1971 void
1972 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
1973         int fg = base.fg, bg = base.bg, temp;
1974         int winx = BORDER+x*xw.cw, winy = BORDER+y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
1975         XFontSet fontset = dc.font.set;
1976         int i;
1977
1978         /* only switch default fg/bg if term is in RV mode */
1979         if(IS_SET(MODE_REVERSE)) {
1980                 if(fg == DefaultFG)
1981                         fg = DefaultBG;
1982                 if(bg == DefaultBG)
1983                         bg = DefaultFG;
1984         }
1985
1986         if(base.mode & ATTR_REVERSE)
1987                 temp = fg, fg = bg, bg = temp;
1988
1989         if(base.mode & ATTR_BOLD) {
1990                 fg += 8;
1991                 fontset = dc.bfont.set;
1992         }
1993
1994         XSetBackground(xw.dpy, dc.gc, dc.col[bg]);
1995         XSetForeground(xw.dpy, dc.gc, dc.col[fg]);
1996
1997         if(base.mode & ATTR_GFX) {
1998                 for(i = 0; i < bytelen; i++) {
1999                         char c = gfx[(uint)s[i] % 256];
2000                         if(c)
2001                                 s[i] = c;
2002                         else if(s[i] > 0x5f)
2003                                 s[i] -= 0x5f;
2004                 }
2005         }
2006
2007         XmbDrawImageString(xw.dpy, xw.buf, fontset, dc.gc, winx, winy, s, bytelen);
2008
2009         if(base.mode & ATTR_UNDERLINE)
2010                 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
2011 }
2012
2013 /* copy buffer pixmap to screen pixmap */
2014 void
2015 xcopy() {
2016         XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
2017         XdbeSwapBuffers(xw.dpy, swpinfo, 1);
2018
2019 }
2020
2021 void
2022 xdrawcursor(void) {
2023         static int oldx = 0;
2024         static int oldy = 0;
2025         int sl;
2026         Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
2027
2028         LIMIT(oldx, 0, term.col-1);
2029         LIMIT(oldy, 0, term.row-1);
2030
2031         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
2032                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
2033
2034         /* remove the old cursor */
2035         if(term.line[oldy][oldx].state & GLYPH_SET) {
2036                 sl = utf8size(term.line[oldy][oldx].c);
2037                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
2038         } else
2039                 xclear(oldx, oldy, oldx, oldy);
2040
2041         xcopy(oldx, oldy, 1, 1);
2042
2043         /* draw the new one */
2044         if(!(term.c.state & CURSOR_HIDE)) {
2045                 if(!(xw.state & WIN_FOCUSED))
2046                         g.bg = DefaultUCS;
2047
2048                 if(IS_SET(MODE_REVERSE))
2049                         g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
2050
2051                 sl = utf8size(g.c);
2052                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2053                 oldx = term.c.x, oldy = term.c.y;
2054         }
2055
2056         xcopy(term.c.x, term.c.y, 1, 1);
2057 }
2058
2059 void
2060 redraw(void) {
2061         struct timespec tv = {0, REDRAW_TIMEOUT * 1000};
2062         tfulldirt();
2063         draw();
2064         nanosleep(&tv, NULL);
2065 }
2066
2067 void
2068 draw() {
2069         drawregion(0, 0, term.col, term.row);
2070         xcopy();
2071         gettimeofday(&xw.lastdraw, NULL);
2072 }
2073
2074 void
2075 drawregion(int x1, int y1, int x2, int y2) {
2076         int ic, ib, x, y, ox, sl;
2077         Glyph base, new;
2078         char buf[DRAW_BUF_SIZ];
2079
2080         if(!(xw.state & WIN_VISIBLE))
2081                 return;
2082
2083         for(y = y1; y < y2; y++) {
2084                 if(!term.dirty[y])
2085                         continue;
2086                 xclear(0, y, term.col, y);
2087                 term.dirty[y] = 0;
2088                 base = term.line[y][0];
2089                 ic = ib = ox = 0;
2090                 for(x = x1; x < x2; x++) {
2091                         new = term.line[y][x];
2092                         if(sel.bx != -1 && *(new.c) && selected(x, y))
2093                                 new.mode ^= ATTR_REVERSE;
2094                         if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
2095                                                   ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
2096                                 xdraws(buf, base, ox, y, ic, ib);
2097                                 ic = ib = 0;
2098                         }
2099                         if(new.state & GLYPH_SET) {
2100                                 if(ib == 0) {
2101                                         ox = x;
2102                                         base = new;
2103                                 }
2104                                 sl = utf8size(new.c);
2105                                 memcpy(buf+ib, new.c, sl);
2106                                 ib += sl;
2107                                 ++ic;
2108                         }
2109                 }
2110                 if(ib > 0)
2111                         xdraws(buf, base, ox, y, ic, ib);
2112         }
2113         xdrawcursor();
2114 }
2115
2116 void
2117 expose(XEvent *ev) {
2118         XExposeEvent *e = &ev->xexpose;
2119         if(xw.state & WIN_REDRAW) {
2120                 if(!e->count)
2121                         xw.state &= ~WIN_REDRAW;
2122         }
2123         xcopy();
2124 }
2125
2126 void
2127 visibility(XEvent *ev) {
2128         XVisibilityEvent *e = &ev->xvisibility;
2129         if(e->state == VisibilityFullyObscured)
2130                 xw.state &= ~WIN_VISIBLE;
2131         else if(!(xw.state & WIN_VISIBLE))
2132                 /* need a full redraw for next Expose, not just a buf copy */
2133                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
2134 }
2135
2136 void
2137 unmap(XEvent *ev) {
2138         xw.state &= ~WIN_VISIBLE;
2139 }
2140
2141 void
2142 xseturgency(int add) {
2143         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
2144         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
2145         XSetWMHints(xw.dpy, xw.win, h);
2146         XFree(h);
2147 }
2148
2149 void
2150 focus(XEvent *ev) {
2151         if(ev->type == FocusIn) {
2152                 xw.state |= WIN_FOCUSED;
2153                 xseturgency(0);
2154         } else
2155                 xw.state &= ~WIN_FOCUSED;
2156         draw();
2157 }
2158
2159 char*
2160 kmap(KeySym k, uint state) {
2161         int i;
2162         state &= ~Mod2Mask;
2163         for(i = 0; i < LEN(key); i++) {
2164                 uint mask = key[i].mask;
2165                 if(key[i].k == k && ((state & mask) == mask || (mask == XK_NO_MOD && !state)))
2166                         return (char*)key[i].s;
2167         }
2168         return NULL;
2169 }
2170
2171 void
2172 kpress(XEvent *ev) {
2173         XKeyEvent *e = &ev->xkey;
2174         KeySym ksym;
2175         char buf[32];
2176         char *customkey;
2177         int len;
2178         int meta;
2179         int shift;
2180         Status status;
2181
2182         meta = e->state & Mod1Mask;
2183         shift = e->state & ShiftMask;
2184         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
2185
2186         /* 1. custom keys from config.h */
2187         if((customkey = kmap(ksym, e->state)))
2188                 ttywrite(customkey, strlen(customkey));
2189         /* 2. hardcoded (overrides X lookup) */
2190         else
2191                 switch(ksym) {
2192                 case XK_Up:
2193                 case XK_Down:
2194                 case XK_Left:
2195                 case XK_Right:
2196                         /* XXX: shift up/down doesn't work */
2197                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
2198                         ttywrite(buf, 3);
2199                         break;
2200                 case XK_Insert:
2201                         if(shift)
2202                                 selpaste();
2203                         break;
2204                 case XK_Return:
2205                         if(IS_SET(MODE_CRLF))
2206                                 ttywrite("\r\n", 2);
2207                         else
2208                                 ttywrite("\r", 1);
2209                         break;
2210                         /* 3. X lookup  */
2211                 default:
2212                         if(len > 0) {
2213                                 if(meta && len == 1)
2214                                         ttywrite("\033", 1);
2215                                 ttywrite(buf, len);
2216                         }
2217                         break;
2218                 }
2219 }
2220
2221 void
2222 cmessage(XEvent *e) {
2223         /* See xembed specs
2224            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
2225         if (e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
2226                 if (e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
2227                         xw.state |= WIN_FOCUSED;
2228                         xseturgency(0);
2229                 } else if (e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
2230                         xw.state &= ~WIN_FOCUSED;
2231                 }
2232                 draw();
2233         }
2234 }
2235
2236 void
2237 resize(XEvent *e) {
2238         int col, row;
2239
2240         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
2241                 return;
2242
2243         xw.w = e->xconfigure.width;
2244         xw.h = e->xconfigure.height;
2245         col = (xw.w - 2*BORDER) / xw.cw;
2246         row = (xw.h - 2*BORDER) / xw.ch;
2247         if(col == term.col && row == term.row)
2248                 return;
2249         if(tresize(col, row))
2250                 draw();
2251         ttyresize(col, row);
2252         xresize(col, row);
2253 }
2254
2255 bool
2256 last_draw_too_old(void) {
2257         struct timeval now;
2258         gettimeofday(&now, NULL);
2259         return TIMEDIFF(now, xw.lastdraw) >= DRAW_TIMEOUT/1000;
2260 }
2261
2262 void
2263 run(void) {
2264         XEvent ev;
2265         fd_set rfd;
2266         int xfd = XConnectionNumber(xw.dpy);
2267         struct timeval timeout = {0};
2268         bool stuff_to_print = 0;
2269
2270         for(;;) {
2271                 FD_ZERO(&rfd);
2272                 FD_SET(cmdfd, &rfd);
2273                 FD_SET(xfd, &rfd);
2274                 timeout.tv_sec  = 0;
2275                 timeout.tv_usec = SELECT_TIMEOUT;
2276                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, &timeout) < 0) {
2277                         if(errno == EINTR)
2278                                 continue;
2279                         die("select failed: %s\n", SERRNO);
2280                 }
2281                 if(FD_ISSET(cmdfd, &rfd)) {
2282                         ttyread();
2283                         stuff_to_print = 1;
2284                 }
2285
2286                 if(stuff_to_print && last_draw_too_old()) {
2287                         stuff_to_print = 0;
2288                         draw();
2289                 }
2290
2291                 while(XPending(xw.dpy)) {
2292                         XNextEvent(xw.dpy, &ev);
2293                         if(XFilterEvent(&ev, xw.win))
2294                                 continue;
2295                         if(handler[ev.type])
2296                                 (handler[ev.type])(&ev);
2297                 }
2298         }
2299 }
2300
2301 int
2302 main(int argc, char *argv[]) {
2303         int i, bitm, xr, yr;
2304         unsigned int wr, hr;
2305
2306         xw.fw = xw.fh = xw.fx = xw.fy = 0;
2307
2308         for(i = 1; i < argc; i++) {
2309                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
2310                 case 't':
2311                         if(++i < argc) opt_title = argv[i];
2312                         break;
2313                 case 'c':
2314                         if(++i < argc) opt_class = argv[i];
2315                         break;
2316                 case 'w':
2317                         if(++i < argc) opt_embed = argv[i];
2318                         break;
2319                 case 'f':
2320                         if (++i < argc) opt_io = argv[i];
2321                         break;
2322                 case 'e':
2323                         /* eat every remaining arguments */
2324                         if(++i < argc) opt_cmd = &argv[i];
2325                         goto run;
2326                 case 'g':
2327                         if(++i >= argc)
2328                                 break;
2329
2330                         bitm = XParseGeometry(argv[i], &xr, &yr, &wr, &hr);
2331                         if(bitm & XValue)
2332                                 xw.fx = xr;
2333                         if(bitm & YValue)
2334                                 xw.fy = yr;
2335                         if(bitm & WidthValue)
2336                                 xw.fw = (int)wr;
2337                         if(bitm & HeightValue)
2338                                 xw.fh = (int)hr;
2339                         if(bitm & XNegative && xw.fx == 0)
2340                                 xw.fx = -1;
2341                         if(bitm & XNegative && xw.fy == 0)
2342                                 xw.fy = -1;
2343
2344                         if(xw.fh != 0 && xw.fw != 0)
2345                                 xw.isfixed = True;
2346                         break;
2347                 case 'v':
2348                 default:
2349                         die(USAGE);
2350                 }
2351         }
2352
2353  run:
2354         setlocale(LC_CTYPE, "");
2355         tnew(80, 24);
2356         ttynew();
2357         xinit();
2358         selinit();
2359         run();
2360         return 0;
2361 }
2362