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 = 0;
  18         int z = 0x20;
  19         int m = 0x1f;
  20         if (~c & 0xc0)
  21                 return c;
  22         while (++l < 6 && c & z) {
  23                 m >>= 1;
  24                 z >>= 1;
  25         }
  26         result = m & c;
  27         while (l--)
  28                 result = (result << 6) | (readpty() & 0x3f);
  29         return result;
  30 }
  31
  32 /* control sequences */
  33 static void ctlseq(void)
  34 {
  35         int c = readpty();
  36         switch (c) {
  37         case 0x09:      /* HT           horizontal tab to next tab stop */
  38                 advance(0, 8 - col % 8, 0);
  39                 break;
  40         case 0x0a:      /* LF           line feed */
  41         case 0x0b:      /* VT           line feed */
  42         case 0x0c:      /* FF           line feed */
  43                 advance(1, (mode & MODE_AUTOCR) ? -col : 0, 1);
  44                 break;
  45         case 0x08:      /* BS           backspace one column */
  46                 advance(0, -1, 0);
  47                 break;
  48         case 0x1b:      /* ESC          start escape sequence */
  49                 escseq();
  50                 break;
  51         case 0x0d:      /* CR           carriage return */
  52                 advance(0, -col, 0);
  53                 break;
  54         case 0x00:      /* NUL          ignored */
  55         case 0x07:      /* BEL          beep */
  56         case 0x7f:      /* DEL          ignored */
  57                 break;
  58         case 0x05:      /* ENQ          trigger answerback message */
  59         case 0x0e:      /* SO           activate G1 character set & newline */
  60         case 0x0f:      /* SI           activate G0 character set */
  61         case 0x11:      /* XON          resume transmission */
  62         case 0x13:      /* XOFF         stop transmission, ignore characters */
  63         case 0x18:      /* CAN          interrupt escape sequence */
  64         case 0x1a:      /* SUB          interrupt escape sequence */
  65         case 0x9b:      /* CSI          equivalent to ESC [ */
  66                 printf("ctlseq: <%d:%c>\n", c, c);
  67                 break;
  68         default:
  69                 lazy_put(readutf8(c), row, col);
  70                 advance(0, 1, 1);
  71                 break;
  72         }
  73 }
  74
  75 #define ESCM(c)         (((c) & 0xf0) == 0x20)
  76 #define ESCF(c)         ((c) > 0x30 && (c) < 0x7f)
  77
  78 /* escape sequences */
  79 static void escseq(void)
  80 {
  81         int c = readpty();
  82         while (ESCM(c))
  83                 c = readpty();
  84         switch(c) {
  85         case '[':       /* CSI          control sequence introducer */
  86                 csiseq();
  87                 break;
  88         case '%':       /* CS...        escseq_cs table */
  89                 escseq_cs();
  90                 break;
  91         case '(':       /* G0...        escseq_g0 table */
  92                 escseq_g0();
  93                 break;
  94         case ')':       /* G1...        escseq_g1 table */
  95                 escseq_g1();
  96                 break;
  97         case '*':       /* G2...        escseq_g2 table */
  98                 escseq_g2();
  99                 break;
 100         case '+':       /* G3...        escseq_g3 table */
 101                 escseq_g3();
 102                 break;
 103         case '7':       /* DECSC        save state (position, charset, attributes) */
 104                 misc_save(&term->sav);
 105                 break;
 106         case '8':       /* DECRC        restore most recently saved state */
 107                 misc_load(&term->sav);
 108                 break;
 109         case 'M':       /* RI           reverse line feed */
 110                 advance(-1, 0, 1);
 111                 break;
 112         case 'D':       /* IND          line feed */
 113                 advance(1, 0, 1);
 114                 break;
 115         case 'E':       /* NEL          newline */
 116                 advance(1, -col, 1);
 117                 break;
 118         case 'c':       /* RIS          reset */
 119         case 'H':       /* HTS          set tab stop at current column */
 120         case 'Z':       /* DECID        DEC private ID; return ESC [ ? 6 c (VT102) */
 121         case '#':       /* DECALN       ("#8") DEC alignment test - fill screen with E's */
 122         case '>':       /* DECPNM       set numeric keypad mode */
 123         case '=':       /* DECPAM       set application keypad mode */
 124         case 'N':       /* SS2          select G2 charset for next char only */
 125         case 'O':       /* SS3          select G3 charset for next char only */
 126         case 'P':       /* DCS          device control string (ended by ST) */
 127         case 'X':       /* SOS          start of string */
 128         case '^':       /* PM           privacy message (ended by ST) */
 129         case '_':       /* APC          application program command (ended by ST) */
 130         case '\\':      /* ST           string terminator */
 131         case 'n':       /* LS2          invoke G2 charset */
 132         case 'o':       /* LS3          invoke G3 charset */
 133         case '|':       /* LS3R         invoke G3 charset as GR */
 134         case '}':       /* LS2R         invoke G2 charset as GR */
 135         case '~':       /* LS1R         invoke G1 charset as GR */
 136         case ']':       /* OSC          operating system command */
 137         case 'g':       /* BEL          alternate BEL */
 138         default:
 139                 printf("escseq: <%d:%c>\n", c, c);
 140                 break;
 141         }
 142 }
 143
 144 static void escseq_cs(void)
 145 {
 146         int c = readpty();
 147         switch(c) {
 148         case '@':       /* CSDFL        select default charset (ISO646/8859-1) */
 149         case 'G':       /* CSUTF8       select UTF-8 */
 150         case '8':       /* CSUTF8       select UTF-8 (obsolete) */
 151         default:
 152                 printf("escseq_cs: <%d:%c>\n", c, c);
 153                 break;
 154         }
 155 }
 156
 157 static void escseq_g0(void)
 158 {
 159         int c = readpty();
 160         switch(c) {
 161         case '8':       /* G0DFL        G0 charset = default mapping (ISO8859-1) */
 162         case '0':       /* G0GFX        G0 charset = VT100 graphics mapping */
 163         case 'U':       /* G0ROM        G0 charset = null mapping (straight to ROM) */
 164         case 'K':       /* G0USR        G0 charset = user defined mapping */
 165         case 'B':       /* G0TXT        G0 charset = ASCII mapping */
 166         default:
 167                 printf("escseq_g0: <%d:%c>\n", c, c);
 168                 break;
 169         }
 170 }
 171
 172 static void escseq_g1(void)
 173 {
 174         int c = readpty();
 175         switch(c) {
 176         case '8':       /* G1DFL        G1 charset = default mapping (ISO8859-1) */
 177         case '0':       /* G1GFX        G1 charset = VT100 graphics mapping */
 178         case 'U':       /* G1ROM        G1 charset = null mapping (straight to ROM) */
 179         case 'K':       /* G1USR        G1 charset = user defined mapping */
 180         case 'B':       /* G1TXT        G1 charset = ASCII mapping */
 181         default:
 182                 printf("escseq_g1: <%d:%c>\n", c, c);
 183                 break;
 184         }
 185 }
 186
 187 static void escseq_g2(void)
 188 {
 189         int c = readpty();
 190         switch(c) {
 191         case '8':       /* G2DFL        G2 charset = default mapping (ISO8859-1) */
 192         case '0':       /* G2GFX        G2 charset = VT100 graphics mapping */
 193         case 'U':       /* G2ROM        G2 charset = null mapping (straight to ROM) */
 194         case 'K':       /* G2USR        G2 charset = user defined mapping */
 195         default:
 196                 printf("escseq_g2: <%d:%c>\n", c, c);
 197                 break;
 198         }
 199 }
 200
 201 static void escseq_g3(void)
 202 {
 203         int c = readpty();
 204         switch(c) {
 205         case '8':       /* G3DFL        G3 charset = default mapping (ISO8859-1) */
 206         case '0':       /* G3GFX        G3 charset = VT100 graphics mapping */
 207         case 'U':       /* G3ROM        G3 charset = null mapping (straight to ROM) */
 208         case 'K':       /* G3USR        G3 charset = user defined mapping */
 209         default:
 210                 printf("escseq_g3: <%d:%c>\n", c, c);
 211                 break;
 212         }
 213 }
 214
 215 static int absrow(int r)
 216 {
 217         return origin() ? top + r : r;
 218 }
 219
 220 #define CSIP(c)                 (((c) & 0xf0) == 0x30)
 221 #define CSII(c)                 (((c) & 0xf0) == 0x20)
 222 #define CSIF(c)                 ((c) >= 0x40 && (c) < 0x80)
 223
 224 #define MAXCSIARGS      32
 225 /* ECMA-48 CSI sequences */
 226 static void csiseq(void)
 227 {
 228         int args[MAXCSIARGS] = {0};
 229         int i;
 230         int n = 0;
 231         int c = readpty();
 232         int inter = 0;
 233         int priv = 0;
 234
 235         if (strchr("<=>?", c)) {
 236                 priv = c;
 237                 c = readpty();
 238         }
 239         while (CSIP(c)) {
 240                 int arg = 0;
 241                 while (isdigit(c)) {
 242                         arg = arg * 10 + (c - '0');
 243                         c = readpty();
 244                 }
 245                 if (c == ';')
 246                         c = readpty();
 247                 args[n] = arg;
 248                 n = n < ARRAY_SIZE(args) ? n + 1 : 0;
 249         }
 250         while (CSII(c)) {
 251                 inter = c;
 252                 c = readpty();
 253         }
 254         switch(c) {
 255         case 'H':       /* CUP          move cursor to row, column */
 256         case 'f':       /* HVP          move cursor to row, column */
 257                 move_cursor(absrow(MAX(0, args[0] - 1)), MAX(0, args[1] - 1));
 258                 break;
 259         case 'J':       /* ED           erase display */
 260                 switch(args[0]) {
 261                 case 0:
 262                         kill_chars(col, pad_cols());
 263                         blank_rows(row + 1, pad_rows());
 264                         break;
 265                 case 1:
 266                         kill_chars(0, col + 1);
 267                         blank_rows(0, row - 1);
 268                         break;
 269                 case 2:
 270                         term_blank();
 271                         break;
 272                 }
 273                 break;
 274         case 'A':       /* CUU          move cursor up */
 275                 advance(-MAX(1, args[0]), 0, 0);
 276                 break;
 277         case 'e':       /* VPR          move cursor down */
 278         case 'B':       /* CUD          move cursor down */
 279                 advance(MAX(1, args[0]), 0, 0);
 280                 break;
 281         case 'a':       /* HPR          move cursor right */
 282         case 'C':       /* CUF          move cursor right */
 283                 advance(0, MAX(1, args[0]), 0);
 284                 break;
 285         case 'D':       /* CUB          move cursor left */
 286                 advance(0, -MAX(1, args[0]), 0);
 287                 break;
 288         case 'K':       /* EL           erase line */
 289                 switch (args[0]) {
 290                 case 0:
 291                         kill_chars(col, pad_cols());
 292                         break;
 293                 case 1:
 294                         kill_chars(0, col + 1);
 295                         break;
 296                 case 2:
 297                         kill_chars(0, pad_cols());
 298                         break;
 299                 }
 300                 break;
 301         case 'L':       /* IL           insert blank lines */
 302                 if (row >= top && row < bot)
 303                         insert_lines(MAX(1, args[0]));
 304                 break;
 305         case 'M':       /* DL           delete lines */
 306                 if (row >= top && row < bot)
 307                         delete_lines(MAX(1, args[0]));
 308                 break;
 309         case 'd':       /* VPA          move to row (current column) */
 310                 move_cursor(absrow(MAX(1, args[0]) - 1), col);
 311                 break;
 312         case 'm':       /* SGR          set graphic rendition */
 313                 setmode(0);
 314                 for (i = 0; i < n; i++)
 315                         setmode(args[i]);
 316                 break;
 317         case 'r':       /* DECSTBM      set scrolling region to (top, bottom) rows
 318  */
 319                 set_region(args[0], args[1]);
 320                 break;
 321         case 'c':       /* DA           return ESC [ ? 6 c (VT102) */
 322                 csiseq_da(priv == '?' ? args[0] | 0x80 : args[0]);
 323                 break;
 324         case 'h':       /* SM           set mode */
 325                 for (i = 0; i < n; i++)
 326                         modeseq(priv == '?' ? args[i] | 0x80 : args[i], 1);
 327                 break;
 328         case 'l':       /* RM           reset mode */
 329                 for (i = 0; i < n; i++)
 330                         modeseq(priv == '?' ? args[i] | 0x80 : args[i], 0);
 331                 break;
 332         case 'P':       /* DCH          delete characters on current line */
 333                 delete_chars(MIN(MAX(1, args[0]), pad_cols() - col));
 334                 break;
 335         case '@':       /* ICH          insert blank characters */
 336                 insert_chars(MAX(1, args[0]));
 337                 break;
 338         case 'n':       /* DSR          device status report */
 339                 csiseq_dsr(args[0]);
 340                 break;
 341         case 'G':       /* CHA          move cursor to column in current row */
 342                 advance(0, MAX(0, args[0] - 1) - col, 0);
 343                 break;
 344         case 'X':       /* ECH          erase characters on current line */
 345                 kill_chars(col, MIN(col + MAX(1, args[0]), pad_cols()));
 346                 break;
 347         case '[':       /* IGN          ignored control sequence */
 348         case 'E':       /* CNL          move cursor down and to column 1 */
 349         case 'F':       /* CPL          move cursor up and to column 1 */
 350         case 'g':       /* TBC          clear tab stop (CSI 3 g = clear all stops) */
 351         case 'q':       /* DECLL        set keyboard LEDs */
 352         case 's':       /* CUPSV        save cursor position */
 353         case 'u':       /* CUPRS        restore cursor position */
 354         case '`':       /* HPA          move cursor to column in current row */
 355         default:
 356                 printf("csiseq: <%d:%c>:", c, c);
 357                 for (i = 0; i < n; i++)
 358                         printf(" %d", args[i]);
 359                 printf("\n");
 360                 break;
 361         }
 362 }
 363
 364 static void csiseq_da(int c)
 365 {
 366         switch(c) {
 367         case 0x00:
 368                 term_sendstr("\x1b[?6c");
 369                 break;
 370         default:
 371                 /* we don't care much about cursor shape */
 372                 /* printf("csiseq_da <0x%x>\n", c); */
 373                 break;
 374         }
 375 }
 376
 377 static void csiseq_dsr(int c)
 378 {
 379         char status[1 << 5];
 380         switch(c) {
 381         case 0x05:
 382                 term_sendstr("\x1b[0n");
 383                 break;
 384         case 0x06:
 385                 snprintf(status, sizeof(status), "\x1b[%d;%dR",
 386                          (origin() ? row - top : row) + 1, col + 1);
 387                 term_sendstr(status);
 388                 break;
 389         default:
 390                 printf("csiseq_dsr <0x%x>\n", c);
 391                 break;
 392         }
 393 }
 394
 395 /* ANSI/DEC specified modes for SM/RM ANSI Specified Modes */
 396 static void modeseq(int c, int set)
 397 {
 398         switch(c) {
 399         case 0x87:      /* DECAWM       Auto Wrap */
 400                 mode = BIT_SET(mode, MODE_NOWRAP, !set);
 401                 break;
 402         case 0x99:      /* DECTCEM      Cursor on (set); Cursor off (reset) */
 403                 mode = BIT_SET(mode, MODE_NOCURSOR, !set);
 404                 break;
 405         case 0x86:      /* DECOM        Sets relative coordinates (set); Sets absolute coordinates (reset) */
 406                 mode = BIT_SET(mode, MODE_ORIGIN, set);
 407                 break;
 408         case 0x14:      /* LNM          Line Feed / New Line Mode */
 409                 mode = BIT_SET(mode, MODE_AUTOCR, set);
 410                 break;
 411         case 0x04:      /* IRM          insertion/replacement mode (always reset) */
 412                 break;
 413         case 0x00:      /* IGN          Error (Ignored) */
 414         case 0x01:      /* GATM         guarded-area transfer mode (ignored) */
 415         case 0x02:      /* KAM          keyboard action mode (always reset) */
 416         case 0x03:      /* CRM          control representation mode (always reset) */
 417         case 0x05:      /* SRTM         status-reporting transfer mode */
 418         case 0x06:      /* ERM          erasure mode (always set) */
 419         case 0x07:      /* VEM          vertical editing mode (ignored) */
 420         case 0x0a:      /* HEM          horizontal editing mode */
 421         case 0x0b:      /* PUM          positioning unit mode */
 422         case 0x0c:      /* SRM          send/receive mode (echo on/off) */
 423         case 0x0d:      /* FEAM         format effector action mode */
 424         case 0x0e:      /* FETM         format effector transfer mode */
 425         case 0x0f:      /* MATM         multiple area transfer mode */
 426         case 0x10:      /* TTM          transfer termination mode */
 427         case 0x11:      /* SATM         selected area transfer mode */
 428         case 0x12:      /* TSM          tabulation stop mode */
 429         case 0x13:      /* EBM          editing boundary mode */
 430 /* DEC Private Modes: "?NUM" -> (NUM | 0x80) */
 431         case 0x80:      /* IGN          Error (Ignored) */
 432         case 0x81:      /* DECCKM       Cursorkeys application (set); Cursorkeys normal (reset) */
 433         case 0x82:      /* DECANM       ANSI (set); VT52 (reset) */
 434         case 0x83:      /* DECCOLM      132 columns (set); 80 columns (reset) */
 435         case 0x84:      /* DECSCLM      Jump scroll (set); Smooth scroll (reset) */
 436         case 0x85:      /* DECSCNM      Reverse screen (set); Normal screen (reset) */
 437         case 0x88:      /* DECARM       Auto Repeat */
 438         case 0x89:      /* DECINLM      Interlace */
 439         case 0x92:      /* DECPFF       Send FF to printer after print screen (set); No char after PS (reset) */
 440         case 0x93:      /* DECPEX       Print screen: prints full screen (set); prints scroll region (reset) */
 441         default:
 442                 printf("modeseq <0x%x>: %d\n", c, set);
 443                 break;
 444         }
 445 }