vt102.c

   1 static void escseq(void);
   2 static void escseq_cs(void);
   3 static void escseq_g0(void);
   4 static void escseq_g1(void);
   5 static void escseq_g2(void);
   6 static void escseq_g3(void);
   7 static void csiseq(void);
   8 static void csiseq_da(int c);
   9 static void csiseq_dsr(int c);
  10 static void modeseq(int c, int set);
  11
  12 /* comments taken from: http://www.ivarch.com/programs/termvt102.shtml */
  13
  14 static int readutf8(int c)
  15 {
  16         int result;
  17         int l = 1;
  18         if (~c & 0xc0)
  19                 return c;
  20         while (l < 6 && c & (0x40 >> l))
  21                 l++;
  22         result = (0x3f >> l) & c;
  23         while (l--)
  24                 result = (result << 6) | (readpty() & 0x3f);
  25         return result;
  26 }
  27
  28 /* control sequences */
  29 static void ctlseq(void)
  30 {
  31         int c = readpty();
  32         switch (c) {
  33         case 0x09:      /* HT           horizontal tab to next tab stop */
  34                 advance(0, 8 - col % 8, 0);
  35                 break;
  36         case 0x0a:      /* LF           line feed */
  37         case 0x0b:      /* VT           line feed */
  38         case 0x0c:      /* FF           line feed */
  39                 advance(1, (mode & MODE_AUTOCR) ? -col : 0, 1);
  40                 break;
  41         case 0x08:      /* BS           backspace one column */
  42                 advance(0, -1, 0);
  43                 break;
  44         case 0x1b:      /* ESC          start escape sequence */
  45                 escseq();
  46                 break;
  47         case 0x0d:      /* CR           carriage return */
  48                 advance(0, -col, 0);
  49                 break;
  50         case 0x00:      /* NUL          ignored */
  51         case 0x07:      /* BEL          beep */
  52         case 0x7f:      /* DEL          ignored */
  53                 break;
  54         case 0x05:      /* ENQ          trigger answerback message */
  55         case 0x0e:      /* SO           activate G1 character set & newline */
  56         case 0x0f:      /* SI           activate G0 character set */
  57         case 0x11:      /* XON          resume transmission */
  58         case 0x13:      /* XOFF         stop transmission, ignore characters */
  59         case 0x18:      /* CAN          interrupt escape sequence */
  60         case 0x1a:      /* SUB          interrupt escape sequence */
  61         case 0x9b:      /* CSI          equivalent to ESC [ */
  62                 printf("ctlseq: <%d:%c>\n", c, c);
  63                 break;
  64         default:
  65                 insertchar(readutf8(c));
  66                 break;
  67         }
  68 }
  69
  70 #define ESCM(c)         (((c) & 0xf0) == 0x20)
  71 #define ESCF(c)         ((c) > 0x30 && (c) < 0x7f)
  72
  73 /* escape sequences */
  74 static void escseq(void)
  75 {
  76         int c = readpty();
  77         while (ESCM(c))
  78                 c = readpty();
  79         switch(c) {
  80         case '[':       /* CSI          control sequence introducer */
  81                 csiseq();
  82                 break;
  83         case '%':       /* CS...        escseq_cs table */
  84                 escseq_cs();
  85                 break;
  86         case '(':       /* G0...        escseq_g0 table */
  87                 escseq_g0();
  88                 break;
  89         case ')':       /* G1...        escseq_g1 table */
  90                 escseq_g1();
  91                 break;
  92         case '*':       /* G2...        escseq_g2 table */
  93                 escseq_g2();
  94                 break;
  95         case '+':       /* G3...        escseq_g3 table */
  96                 escseq_g3();
  97                 break;
  98         case '7':       /* DECSC        save state (position, charset, attributes) */
  99                 misc_save(&term->sav);
 100                 break;
 101         case '8':       /* DECRC        restore most recently saved state */
 102                 misc_load(&term->sav);
 103                 break;
 104         case 'M':       /* RI           reverse line feed */
 105                 advance(-1, 0, 1);
 106                 break;
 107         case 'D':       /* IND          line feed */
 108                 advance(1, 0, 1);
 109                 break;
 110         case 'E':       /* NEL          newline */
 111                 advance(1, -col, 1);
 112                 break;
 113         case 'c':       /* RIS          reset */
 114                 term_reset();
 115                 break;
 116         case 'H':       /* HTS          set tab stop at current column */
 117         case 'Z':       /* DECID        DEC private ID; return ESC [ ? 6 c (VT102) */
 118         case '#':       /* DECALN       ("#8") DEC alignment test - fill screen with E's */
 119         case '>':       /* DECPNM       set numeric keypad mode */
 120         case '=':       /* DECPAM       set application keypad mode */
 121         case 'N':       /* SS2          select G2 charset for next char only */
 122         case 'O':       /* SS3          select G3 charset for next char only */
 123         case 'P':       /* DCS          device control string (ended by ST) */
 124         case 'X':       /* SOS          start of string */
 125         case '^':       /* PM           privacy message (ended by ST) */
 126         case '_':       /* APC          application program command (ended by ST) */
 127         case '\\':      /* ST           string terminator */
 128         case 'n':       /* LS2          invoke G2 charset */
 129         case 'o':       /* LS3          invoke G3 charset */
 130         case '|':       /* LS3R         invoke G3 charset as GR */
 131         case '}':       /* LS2R         invoke G2 charset as GR */
 132         case '~':       /* LS1R         invoke G1 charset as GR */
 133         case ']':       /* OSC          operating system command */
 134         case 'g':       /* BEL          alternate BEL */
 135         default:
 136                 printf("escseq: <%d:%c>\n", c, c);
 137                 break;
 138         }
 139 }
 140
 141 static void escseq_cs(void)
 142 {
 143         int c = readpty();
 144         switch(c) {
 145         case '@':       /* CSDFL        select default charset (ISO646/8859-1) */
 146         case 'G':       /* CSUTF8       select UTF-8 */
 147         case '8':       /* CSUTF8       select UTF-8 (obsolete) */
 148         default:
 149                 printf("escseq_cs: <%d:%c>\n", c, c);
 150                 break;
 151         }
 152 }
 153
 154 static void escseq_g0(void)
 155 {
 156         int c = readpty();
 157         switch(c) {
 158         case '8':       /* G0DFL        G0 charset = default mapping (ISO8859-1) */
 159         case '0':       /* G0GFX        G0 charset = VT100 graphics mapping */
 160         case 'U':       /* G0ROM        G0 charset = null mapping (straight to ROM) */
 161         case 'K':       /* G0USR        G0 charset = user defined mapping */
 162         case 'B':       /* G0TXT        G0 charset = ASCII mapping */
 163         default:
 164                 printf("escseq_g0: <%d:%c>\n", c, c);
 165                 break;
 166         }
 167 }
 168
 169 static void escseq_g1(void)
 170 {
 171         int c = readpty();
 172         switch(c) {
 173         case '8':       /* G1DFL        G1 charset = default mapping (ISO8859-1) */
 174         case '0':       /* G1GFX        G1 charset = VT100 graphics mapping */
 175         case 'U':       /* G1ROM        G1 charset = null mapping (straight to ROM) */
 176         case 'K':       /* G1USR        G1 charset = user defined mapping */
 177         case 'B':       /* G1TXT        G1 charset = ASCII mapping */
 178         default:
 179                 printf("escseq_g1: <%d:%c>\n", c, c);
 180                 break;
 181         }
 182 }
 183
 184 static void escseq_g2(void)
 185 {
 186         int c = readpty();
 187         switch(c) {
 188         case '8':       /* G2DFL        G2 charset = default mapping (ISO8859-1) */
 189         case '0':       /* G2GFX        G2 charset = VT100 graphics mapping */
 190         case 'U':       /* G2ROM        G2 charset = null mapping (straight to ROM) */
 191         case 'K':       /* G2USR        G2 charset = user defined mapping */
 192         default:
 193                 printf("escseq_g2: <%d:%c>\n", c, c);
 194                 break;
 195         }
 196 }
 197
 198 static void escseq_g3(void)
 199 {
 200         int c = readpty();
 201         switch(c) {
 202         case '8':       /* G3DFL        G3 charset = default mapping (ISO8859-1) */
 203         case '0':       /* G3GFX        G3 charset = VT100 graphics mapping */
 204         case 'U':       /* G3ROM        G3 charset = null mapping (straight to ROM) */
 205         case 'K':       /* G3USR        G3 charset = user defined mapping */
 206         default:
 207                 printf("escseq_g3: <%d:%c>\n", c, c);
 208                 break;
 209         }
 210 }
 211
 212 static int absrow(int r)
 213 {
 214         return origin() ? top + r : r;
 215 }
 216
 217 #define CSIP(c)                 (((c) & 0xf0) == 0x30)
 218 #define CSII(c)                 (((c) & 0xf0) == 0x20)
 219 #define CSIF(c)                 ((c) >= 0x40 && (c) < 0x80)
 220
 221 #define MAXCSIARGS      32
 222 /* ECMA-48 CSI sequences */
 223 static void csiseq(void)
 224 {
 225         int args[MAXCSIARGS] = {0};
 226         int i;
 227         int n = 0;
 228         int c = readpty();
 229         int inter = 0;
 230         int priv = 0;
 231
 232         if (strchr("<=>?", c)) {
 233                 priv = c;
 234                 c = readpty();
 235         }
 236         while (CSIP(c)) {
 237                 int arg = 0;
 238                 while (isdigit(c)) {
 239                         arg = arg * 10 + (c - '0');
 240                         c = readpty();
 241                 }
 242                 if (c == ';')
 243                         c = readpty();
 244                 args[n] = arg;
 245                 n = n < ARRAY_SIZE(args) ? n + 1 : 0;
 246         }
 247         while (CSII(c)) {
 248                 inter = c;
 249                 c = readpty();
 250         }
 251         switch(c) {
 252         case 'H':       /* CUP          move cursor to row, column */
 253         case 'f':       /* HVP          move cursor to row, column */
 254                 move_cursor(absrow(MAX(0, args[0] - 1)), MAX(0, args[1] - 1));
 255                 break;
 256         case 'J':       /* ED           erase display */
 257                 switch(args[0]) {
 258                 case 0:
 259                         kill_chars(col, pad_cols());
 260                         blank_rows(row + 1, pad_rows());
 261                         break;
 262                 case 1:
 263                         kill_chars(0, col + 1);
 264                         blank_rows(0, row - 1);
 265                         break;
 266                 case 2:
 267                         term_blank();
 268                         break;
 269                 }
 270                 break;
 271         case 'A':       /* CUU          move cursor up */
 272                 advance(-MAX(1, args[0]), 0, 0);
 273                 break;
 274         case 'e':       /* VPR          move cursor down */
 275         case 'B':       /* CUD          move cursor down */
 276                 advance(MAX(1, args[0]), 0, 0);
 277                 break;
 278         case 'a':       /* HPR          move cursor right */
 279         case 'C':       /* CUF          move cursor right */
 280                 advance(0, MAX(1, args[0]), 0);
 281                 break;
 282         case 'D':       /* CUB          move cursor left */
 283                 advance(0, -MAX(1, args[0]), 0);
 284                 break;
 285         case 'K':       /* EL           erase line */
 286                 switch (args[0]) {
 287                 case 0:
 288                         kill_chars(col, pad_cols());
 289                         break;
 290                 case 1:
 291                         kill_chars(0, col + 1);
 292                         break;
 293                 case 2:
 294                         kill_chars(0, pad_cols());
 295                         break;
 296                 }
 297                 break;
 298         case 'L':       /* IL           insert blank lines */
 299                 if (row >= top && row < bot)
 300                         insert_lines(MAX(1, args[0]));
 301                 break;
 302         case 'M':       /* DL           delete lines */
 303                 if (row >= top && row < bot)
 304                         delete_lines(MAX(1, args[0]));
 305                 break;
 306         case 'd':       /* VPA          move to row (current column) */
 307                 move_cursor(absrow(MAX(1, args[0]) - 1), col);
 308                 break;
 309         case 'm':       /* SGR          set graphic rendition */
 310                 if (!n)
 311                         setattr(0);
 312                 for (i = 0; i < n; i++)
 313                         setattr(args[i]);
 314                 break;
 315         case 'r':       /* DECSTBM      set scrolling region to (top, bottom) rows
 316  */
 317                 set_region(args[0], args[1]);
 318                 break;
 319         case 'c':       /* DA           return ESC [ ? 6 c (VT102) */
 320                 csiseq_da(priv == '?' ? args[0] | 0x80 : args[0]);
 321                 break;
 322         case 'h':       /* SM           set mode */
 323                 for (i = 0; i < n; i++)
 324                         modeseq(priv == '?' ? args[i] | 0x80 : args[i], 1);
 325                 break;
 326         case 'l':       /* RM           reset mode */
 327                 for (i = 0; i < n; i++)
 328                         modeseq(priv == '?' ? args[i] | 0x80 : args[i], 0);
 329                 break;
 330         case 'P':       /* DCH          delete characters on current line */
 331                 delete_chars(MIN(MAX(1, args[0]), pad_cols() - col));
 332                 break;
 333         case '@':       /* ICH          insert blank characters */
 334                 insert_chars(MAX(1, args[0]));
 335                 break;
 336         case 'n':       /* DSR          device status report */
 337                 csiseq_dsr(args[0]);
 338                 break;
 339         case 'G':       /* CHA          move cursor to column in current row */
 340                 advance(0, MAX(0, args[0] - 1) - col, 0);
 341                 break;
 342         case 'X':       /* ECH          erase characters on current line */
 343                 kill_chars(col, MIN(col + MAX(1, args[0]), pad_cols()));
 344                 break;
 345         case '[':       /* IGN          ignored control sequence */
 346         case 'E':       /* CNL          move cursor down and to column 1 */
 347         case 'F':       /* CPL          move cursor up and to column 1 */
 348         case 'g':       /* TBC          clear tab stop (CSI 3 g = clear all stops) */
 349         case 'q':       /* DECLL        set keyboard LEDs */
 350         case 's':       /* CUPSV        save cursor position */
 351         case 'u':       /* CUPRS        restore cursor position */
 352         case '`':       /* HPA          move cursor to column in current row */
 353         default:
 354                 printf("csiseq: <%d:%c>:", c, c);
 355                 for (i = 0; i < n; i++)
 356                         printf(" %d", args[i]);
 357                 printf("\n");
 358                 break;
 359         }
 360 }
 361
 362 static void csiseq_da(int c)
 363 {
 364         switch(c) {
 365         case 0x00:
 366                 term_sendstr("\x1b[?6c");
 367                 break;
 368         default:
 369                 /* we don't care much about cursor shape */
 370                 /* printf("csiseq_da <0x%x>\n", c); */
 371                 break;
 372         }
 373 }
 374
 375 static void csiseq_dsr(int c)
 376 {
 377         char status[1 << 5];
 378         switch(c) {
 379         case 0x05:
 380                 term_sendstr("\x1b[0n");
 381                 break;
 382         case 0x06:
 383                 snprintf(status, sizeof(status), "\x1b[%d;%dR",
 384                          (origin() ? row - top : row) + 1, col + 1);
 385                 term_sendstr(status);
 386                 break;
 387         default:
 388                 printf("csiseq_dsr <0x%x>\n", c);
 389                 break;
 390         }
 391 }
 392
 393 /* ANSI/DEC specified modes for SM/RM ANSI Specified Modes */
 394 static void modeseq(int c, int set)
 395 {
 396         switch(c) {
 397         case 0x87:      /* DECAWM       Auto Wrap */
 398                 mode = BIT_SET(mode, MODE_WRAP, set);
 399                 break;
 400         case 0x99:      /* DECTCEM      Cursor on (set); Cursor off (reset) */
 401                 mode = BIT_SET(mode, MODE_CURSOR, set);
 402                 break;
 403         case 0x86:      /* DECOM        Sets relative coordinates (set); Sets absolute coordinates (reset) */
 404                 mode = BIT_SET(mode, MODE_ORIGIN, set);
 405                 break;
 406         case 0x14:      /* LNM          Line Feed / New Line Mode */
 407                 mode = BIT_SET(mode, MODE_AUTOCR, set);
 408                 break;
 409         case 0x04:      /* IRM          insertion/replacement mode (always reset) */
 410                 break;
 411         case 0x00:      /* IGN          Error (Ignored) */
 412         case 0x01:      /* GATM         guarded-area transfer mode (ignored) */
 413         case 0x02:      /* KAM          keyboard action mode (always reset) */
 414         case 0x03:      /* CRM          control representation mode (always reset) */
 415         case 0x05:      /* SRTM         status-reporting transfer mode */
 416         case 0x06:      /* ERM          erasure mode (always set) */
 417         case 0x07:      /* VEM          vertical editing mode (ignored) */
 418         case 0x0a:      /* HEM          horizontal editing mode */
 419         case 0x0b:      /* PUM          positioning unit mode */
 420         case 0x0c:      /* SRM          send/receive mode (echo on/off) */
 421         case 0x0d:      /* FEAM         format effector action mode */
 422         case 0x0e:      /* FETM         format effector transfer mode */
 423         case 0x0f:      /* MATM         multiple area transfer mode */
 424         case 0x10:      /* TTM          transfer termination mode */
 425         case 0x11:      /* SATM         selected area transfer mode */
 426         case 0x12:      /* TSM          tabulation stop mode */
 427         case 0x13:      /* EBM          editing boundary mode */
 428 /* DEC Private Modes: "?NUM" -> (NUM | 0x80) */
 429         case 0x80:      /* IGN          Error (Ignored) */
 430         case 0x81:      /* DECCKM       Cursorkeys application (set); Cursorkeys normal (reset) */
 431         case 0x82:      /* DECANM       ANSI (set); VT52 (reset) */
 432         case 0x83:      /* DECCOLM      132 columns (set); 80 columns (reset) */
 433         case 0x84:      /* DECSCLM      Jump scroll (set); Smooth scroll (reset) */
 434         case 0x85:      /* DECSCNM      Reverse screen (set); Normal screen (reset) */
 435         case 0x88:      /* DECARM       Auto Repeat */
 436         case 0x89:      /* DECINLM      Interlace */
 437         case 0x92:      /* DECPFF       Send FF to printer after print screen (set); No char after PS (reset) */
 438         case 0x93:      /* DECPEX       Print screen: prints full screen (set); prints scroll region (reset) */
 439         default:
 440                 printf("modeseq <0x%x>: %d\n", c, set);
 441                 break;
 442         }
 443 }