| 1 | /* Copyright (c) 1979 Regents of the University of California */ |
| 2 | #include "ex.h" |
| 3 | #include "ex_tty.h" |
| 4 | #include "ex_vis.h" |
| 5 | |
| 6 | /* |
| 7 | * Input routines for open/visual. |
| 8 | * We handle upper case only terminals in visual and reading from the |
| 9 | * echo area here as well as notification on large changes |
| 10 | * which appears in the echo area. |
| 11 | */ |
| 12 | |
| 13 | /* |
| 14 | * Return the key. |
| 15 | */ |
| 16 | ungetkey(c) |
| 17 | char c; |
| 18 | { |
| 19 | |
| 20 | if (Peekkey != ATTN) |
| 21 | Peekkey = c; |
| 22 | } |
| 23 | |
| 24 | /* |
| 25 | * Return a keystroke, but never a ^@. |
| 26 | */ |
| 27 | getkey() |
| 28 | { |
| 29 | register char c; |
| 30 | |
| 31 | do { |
| 32 | c = getbr(); |
| 33 | if (c==0) |
| 34 | beep(); |
| 35 | } while (c == 0); |
| 36 | return (c); |
| 37 | } |
| 38 | |
| 39 | /* |
| 40 | * Tell whether next keystroke would be a ^@. |
| 41 | */ |
| 42 | peekbr() |
| 43 | { |
| 44 | |
| 45 | Peekkey = getbr(); |
| 46 | return (Peekkey == 0); |
| 47 | } |
| 48 | |
| 49 | short precbksl; |
| 50 | |
| 51 | /* |
| 52 | * Get a keystroke, including a ^@. |
| 53 | * If an key was returned with ungetkey, that |
| 54 | * comes back first. Next comes unread input (e.g. |
| 55 | * from repeating commands with .), and finally new |
| 56 | * keystrokes. |
| 57 | * |
| 58 | * The hard work here is in mapping of \ escaped |
| 59 | * characters on upper case only terminals. |
| 60 | */ |
| 61 | getbr() |
| 62 | { |
| 63 | char ch; |
| 64 | register int c, d; |
| 65 | register char *colp; |
| 66 | |
| 67 | getATTN: |
| 68 | if (Peekkey) { |
| 69 | c = Peekkey; |
| 70 | Peekkey = 0; |
| 71 | return (c); |
| 72 | } |
| 73 | if (vglobp) { |
| 74 | if (*vglobp) |
| 75 | return (lastvgk = *vglobp++); |
| 76 | lastvgk = 0; |
| 77 | return (ESCAPE); |
| 78 | } |
| 79 | if (vmacp) { |
| 80 | if (*vmacp) |
| 81 | return(*vmacp++); |
| 82 | /* End of a macro or set of nested macros */ |
| 83 | vmacp = 0; |
| 84 | if (inopen == -1) /* don't screw up undo for esc esc */ |
| 85 | vundkind = VMANY; |
| 86 | inopen = 1; /* restore old setting now that macro done */ |
| 87 | } |
| 88 | #ifdef TRACE |
| 89 | if (trace) |
| 90 | fflush(trace); |
| 91 | #endif |
| 92 | flusho(); |
| 93 | again: |
| 94 | if (read(0, &ch, 1) != 1) { |
| 95 | if (errno == EINTR) |
| 96 | goto getATTN; |
| 97 | error("Input read error"); |
| 98 | } |
| 99 | c = ch & TRIM; |
| 100 | |
| 101 | #ifdef UCVISUAL |
| 102 | /* |
| 103 | * The algorithm here is that of the UNIX kernel. |
| 104 | * See the description in the programmers manual. |
| 105 | */ |
| 106 | if (UPPERCASE) { |
| 107 | if (isupper(c)) |
| 108 | c = tolower(c); |
| 109 | if (c == '\\') { |
| 110 | if (precbksl < 2) |
| 111 | precbksl++; |
| 112 | if (precbksl == 1) |
| 113 | goto again; |
| 114 | } else if (precbksl) { |
| 115 | d = 0; |
| 116 | if (islower(c)) |
| 117 | d = toupper(c); |
| 118 | else { |
| 119 | colp = "({)}!|^~'~"; |
| 120 | while (d = *colp++) |
| 121 | if (d == c) { |
| 122 | d = *colp++; |
| 123 | break; |
| 124 | } else |
| 125 | colp++; |
| 126 | } |
| 127 | if (precbksl == 2) { |
| 128 | if (!d) { |
| 129 | Peekkey = c; |
| 130 | precbksl = 0; |
| 131 | c = '\\'; |
| 132 | } |
| 133 | } else if (d) |
| 134 | c = d; |
| 135 | else { |
| 136 | Peekkey = c; |
| 137 | precbksl = 0; |
| 138 | c = '\\'; |
| 139 | } |
| 140 | } |
| 141 | if (c != '\\') |
| 142 | precbksl = 0; |
| 143 | } |
| 144 | #endif |
| 145 | #ifdef TRACE |
| 146 | if (trace) { |
| 147 | if (!techoin) { |
| 148 | tfixnl(); |
| 149 | techoin = 1; |
| 150 | fprintf(trace, "*** Input: "); |
| 151 | } |
| 152 | tracec(c); |
| 153 | } |
| 154 | #endif |
| 155 | lastvgk = 0; |
| 156 | return (c); |
| 157 | } |
| 158 | |
| 159 | /* |
| 160 | * Get a key, but if a delete, quit or attention |
| 161 | * is typed return 0 so we will abort a partial command. |
| 162 | */ |
| 163 | getesc() |
| 164 | { |
| 165 | register int c; |
| 166 | |
| 167 | c = getkey(); |
| 168 | switch (c) { |
| 169 | |
| 170 | case ATTN: |
| 171 | case QUIT: |
| 172 | ungetkey(c); |
| 173 | return (0); |
| 174 | |
| 175 | case ESCAPE: |
| 176 | return (0); |
| 177 | } |
| 178 | return (c); |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * Peek at the next keystroke. |
| 183 | */ |
| 184 | peekkey() |
| 185 | { |
| 186 | |
| 187 | Peekkey = getkey(); |
| 188 | return (Peekkey); |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * Read a line from the echo area, with single character prompt c. |
| 193 | * A return value of 1 means the user blewit or blewit away. |
| 194 | */ |
| 195 | readecho(c) |
| 196 | char c; |
| 197 | { |
| 198 | register char *sc = cursor; |
| 199 | register int (*OP)(); |
| 200 | bool waste; |
| 201 | register int OPeek; |
| 202 | |
| 203 | if (WBOT == WECHO) |
| 204 | vclean(); |
| 205 | else |
| 206 | vclrech(0); |
| 207 | splitw++; |
| 208 | vgoto(WECHO, 0); |
| 209 | putchar(c); |
| 210 | vclreol(); |
| 211 | vgoto(WECHO, 1); |
| 212 | cursor = linebuf; linebuf[0] = 0; genbuf[0] = c; |
| 213 | if (peekbr()) { |
| 214 | if (!INS[0] || (INS[0] & (QUOTE|TRIM)) == OVERBUF) |
| 215 | goto blewit; |
| 216 | vglobp = INS; |
| 217 | } |
| 218 | OP = Pline; Pline = normline; |
| 219 | ignore(vgetline(0, genbuf + 1, &waste)); |
| 220 | vscrap(); |
| 221 | Pline = OP; |
| 222 | if (Peekkey != ATTN && Peekkey != QUIT && Peekkey != CTRL(h)) { |
| 223 | cursor = sc; |
| 224 | vclreol(); |
| 225 | return (0); |
| 226 | } |
| 227 | blewit: |
| 228 | OPeek = Peekkey==CTRL(h) ? 0 : Peekkey; Peekkey = 0; |
| 229 | splitw = 0; |
| 230 | vclean(); |
| 231 | vshow(dot, NOLINE); |
| 232 | vnline(sc); |
| 233 | Peekkey = OPeek; |
| 234 | return (1); |
| 235 | } |
| 236 | |
| 237 | /* |
| 238 | * A complete command has been defined for |
| 239 | * the purposes of repeat, so copy it from |
| 240 | * the working to the previous command buffer. |
| 241 | */ |
| 242 | setLAST() |
| 243 | { |
| 244 | |
| 245 | if (vglobp) |
| 246 | return; |
| 247 | lastreg = vreg; |
| 248 | lasthad = Xhadcnt; |
| 249 | lastcnt = Xcnt; |
| 250 | *lastcp = 0; |
| 251 | CP(lastcmd, workcmd); |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * Gather up some more text from an insert. |
| 256 | * If the insertion buffer oveflows, then destroy |
| 257 | * the repeatability of the insert. |
| 258 | */ |
| 259 | addtext(cp) |
| 260 | char *cp; |
| 261 | { |
| 262 | |
| 263 | if (vglobp) |
| 264 | return; |
| 265 | addto(INS, cp); |
| 266 | if ((INS[0] & (QUOTE|TRIM)) == OVERBUF) |
| 267 | lastcmd[0] = 0; |
| 268 | } |
| 269 | |
| 270 | setDEL() |
| 271 | { |
| 272 | |
| 273 | setBUF(DEL); |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Put text from cursor upto wcursor in BUF. |
| 278 | */ |
| 279 | setBUF(BUF) |
| 280 | register char *BUF; |
| 281 | { |
| 282 | register int c; |
| 283 | register char *wp = wcursor; |
| 284 | |
| 285 | c = *wp; |
| 286 | *wp = 0; |
| 287 | BUF[0] = 0; |
| 288 | addto(BUF, cursor); |
| 289 | *wp = c; |
| 290 | } |
| 291 | |
| 292 | addto(buf, str) |
| 293 | register char *buf, *str; |
| 294 | { |
| 295 | |
| 296 | if ((buf[0] & (QUOTE|TRIM)) == OVERBUF) |
| 297 | return; |
| 298 | if (strlen(buf) + strlen(str) + 1 >= VBSIZE) { |
| 299 | buf[0] = OVERBUF; |
| 300 | return; |
| 301 | } |
| 302 | ignore(strcat(buf, str)); |
| 303 | } |
| 304 | |
| 305 | /* |
| 306 | * Note a change affecting a lot of lines, or non-visible |
| 307 | * lines. If the parameter must is set, then we only want |
| 308 | * to do this for open modes now; return and save for later |
| 309 | * notification in visual. |
| 310 | */ |
| 311 | noteit(must) |
| 312 | bool must; |
| 313 | { |
| 314 | register int sdl = destline, sdc = destcol; |
| 315 | |
| 316 | if (notecnt < 2 || !must && state == VISUAL) |
| 317 | return (0); |
| 318 | splitw++; |
| 319 | if (WBOT == WECHO) |
| 320 | vmoveitup(1, 1); |
| 321 | vigoto(WECHO, 0); |
| 322 | printf("%d %sline", notecnt, notesgn); |
| 323 | if (notecnt > 1) |
| 324 | putchar('s'); |
| 325 | if (*notenam) { |
| 326 | printf(" %s", notenam); |
| 327 | if (*(strend(notenam) - 1) != 'e') |
| 328 | putchar('e'); |
| 329 | putchar('d'); |
| 330 | } |
| 331 | vclreol(); |
| 332 | notecnt = 0; |
| 333 | if (state != VISUAL) |
| 334 | vcnt = vcline = 0; |
| 335 | splitw = 0; |
| 336 | if (state == ONEOPEN || state == CRTOPEN) |
| 337 | vup1(); |
| 338 | destline = sdl; destcol = sdc; |
| 339 | return (1); |
| 340 | } |
| 341 | |
| 342 | /* |
| 343 | * Rrrrringgggggg. |
| 344 | * If possible, use flash (VB). |
| 345 | */ |
| 346 | beep() |
| 347 | { |
| 348 | |
| 349 | if (VB) |
| 350 | vputp(VB, 0); |
| 351 | else |
| 352 | vputc(CTRL(g)); |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * Map the command input character c, |
| 357 | * for keypads and labelled keys which do cursor |
| 358 | * motions. I.e. on an adm3a we might map ^K to ^P. |
| 359 | * DM1520 for example has a lot of mappable characters. |
| 360 | */ |
| 361 | |
| 362 | map(c,maps) |
| 363 | register int c; |
| 364 | register struct maps *maps; |
| 365 | { |
| 366 | register int d; |
| 367 | register char *p, *q; |
| 368 | char b[10]; /* Assumption: no keypad sends string longer than 10 */ |
| 369 | |
| 370 | /* |
| 371 | * Mapping for special keys on the terminal only. |
| 372 | * BUG: if there's a long sequence and it matches |
| 373 | * some chars and then misses, we lose some chars. |
| 374 | * |
| 375 | * For this to work, some conditions must be met. |
| 376 | * 1) Keypad sends SHORT (2 or 3 char) strings |
| 377 | * 2) All strings sent are same length & similar |
| 378 | * 3) The user is unlikely to type the first few chars of |
| 379 | * one of these strings very fast. |
| 380 | * Note: some code has been fixed up since the above was laid out, |
| 381 | * so conditions 1 & 2 are probably not required anymore. |
| 382 | * However, this hasn't been tested with any first char |
| 383 | * that means anything else except escape. |
| 384 | */ |
| 385 | #ifdef MDEBUG |
| 386 | if (trace) |
| 387 | fprintf(trace,"map(%c): ",c); |
| 388 | #endif |
| 389 | b[0] = c; |
| 390 | b[1] = 0; |
| 391 | for (d=0; maps[d].mapto; d++) { |
| 392 | #ifdef MDEBUG |
| 393 | if (trace) |
| 394 | fprintf(trace,"d=%d, ",d); |
| 395 | #endif |
| 396 | if (p = maps[d].cap) { |
| 397 | for (q=b; *p; p++, q++) { |
| 398 | #ifdef MDEBUG |
| 399 | if (trace) |
| 400 | fprintf(trace,"q->b[%d], ",q-b); |
| 401 | #endif |
| 402 | if (*q==0) { |
| 403 | /* |
| 404 | * This test is oversimplified, but |
| 405 | * should work mostly. It handles the |
| 406 | * case where we get an ESCAPE that |
| 407 | * wasn't part of a keypad string. |
| 408 | */ |
| 409 | if ((c=='#' ? peekkey() : fastpeekkey()) == 0) { |
| 410 | #ifdef MDEBUG |
| 411 | if (trace) |
| 412 | fprintf(trace,"fpk=0: return %c",c); |
| 413 | #endif |
| 414 | macpush(&b[1],1); |
| 415 | return(c); |
| 416 | } |
| 417 | *q = getkey(); |
| 418 | q[1] = 0; |
| 419 | } |
| 420 | if (*p != *q) |
| 421 | goto contin; |
| 422 | } |
| 423 | macpush(maps[d].mapto,1); |
| 424 | c = getkey(); |
| 425 | #ifdef MDEBUG |
| 426 | if (trace) |
| 427 | fprintf(trace,"Success: return %c",c); |
| 428 | #endif |
| 429 | return(c); /* first char of map string */ |
| 430 | contin:; |
| 431 | } |
| 432 | } |
| 433 | #ifdef MDEBUG |
| 434 | if (trace) |
| 435 | fprintf(trace,"Fail: return %c",c); /* DEBUG */ |
| 436 | #endif |
| 437 | macpush(&b[1],0); |
| 438 | return(c); |
| 439 | } |
| 440 | |
| 441 | /* |
| 442 | * Push st onto the front of vmacp. This is tricky because we have to |
| 443 | * worry about where vmacp was previously pointing. We also have to |
| 444 | * check for overflow (which is typically from a recursive macro) |
| 445 | * Finally we have to set a flag so the whole thing can be undone. |
| 446 | * canundo is 1 iff we want to be able to undo the macro. This |
| 447 | * is false for, for example, pushing back lookahead from fastpeekkey(), |
| 448 | * since otherwise two fast escapes can clobber our undo. |
| 449 | */ |
| 450 | macpush(st, canundo) |
| 451 | char *st; |
| 452 | int canundo; |
| 453 | { |
| 454 | char tmpbuf[BUFSIZ]; |
| 455 | |
| 456 | if (st==0 || *st==0) |
| 457 | return; |
| 458 | #ifdef TRACE |
| 459 | if (trace) |
| 460 | fprintf(trace, "macpush(%s)",st); |
| 461 | #endif |
| 462 | if (strlen(vmacp) + strlen(st) > BUFSIZ) |
| 463 | error("Macro too long@ - maybe recursive?"); |
| 464 | if (vmacp) { |
| 465 | strcpy(tmpbuf, vmacp); |
| 466 | canundo = 0; /* can't undo inside a macro anyway */ |
| 467 | } |
| 468 | strcpy(vmacbuf, st); |
| 469 | if (vmacp) |
| 470 | strcat(vmacbuf, tmpbuf); |
| 471 | vmacp = vmacbuf; |
| 472 | /* arrange to be able to undo the whole macro */ |
| 473 | if (canundo) { |
| 474 | inopen = -1; /* no need to save since it had to be 1 or -1 before */ |
| 475 | otchng = tchng; |
| 476 | vsave(); |
| 477 | saveall(); |
| 478 | vundkind = VMANY; |
| 479 | } |
| 480 | #ifdef TRACE |
| 481 | if (trace) |
| 482 | fprintf(trace, "saveall for macro: undkind=%d, unddel=%d, undap1=%d, undap2=%d, dol=%d, unddol=%d, truedol=%d\n", undkind, lineno(unddel), lineno(undap1), lineno(undap2), lineno(dol), lineno(unddol), lineno(truedol)); |
| 483 | #endif |
| 484 | } |
| 485 | |
| 486 | /* |
| 487 | * Get a count from the keyed input stream. |
| 488 | * A zero count is indistinguishable from no count. |
| 489 | */ |
| 490 | vgetcnt() |
| 491 | { |
| 492 | register int c, cnt; |
| 493 | |
| 494 | cnt = 0; |
| 495 | for (;;) { |
| 496 | c = getkey(); |
| 497 | if (!isdigit(c)) |
| 498 | break; |
| 499 | cnt *= 10, cnt += c - '0'; |
| 500 | } |
| 501 | ungetkey(c); |
| 502 | Xhadcnt = 1; |
| 503 | Xcnt = cnt; |
| 504 | return(cnt); |
| 505 | } |
| 506 | |
| 507 | /* |
| 508 | * fastpeekkey is just like peekkey but insists the character come in |
| 509 | * fast (within 1 second). This will succeed if it is the 2nd char of |
| 510 | * a machine generated sequence (such as a function pad from an escape |
| 511 | * flavor terminal) but fail for a human hitting escape then waiting. |
| 512 | */ |
| 513 | fastpeekkey() |
| 514 | { |
| 515 | int trapalarm(); |
| 516 | register int c; |
| 517 | |
| 518 | if (inopen == -1) /* don't work inside macros! */ |
| 519 | return (0); |
| 520 | signal(SIGALRM, trapalarm); |
| 521 | alarm(1); |
| 522 | CATCH |
| 523 | c = peekkey(); |
| 524 | #ifdef MDEBUG |
| 525 | if (trace) |
| 526 | fprintf(trace,"[OK]",c); |
| 527 | #endif |
| 528 | alarm(0); |
| 529 | ONERR |
| 530 | c = 0; |
| 531 | #ifdef MDEBUG |
| 532 | if (trace) |
| 533 | fprintf(trace,"[TOUT]",c); |
| 534 | #endif |
| 535 | ENDCATCH |
| 536 | #ifdef MDEBUG |
| 537 | if (trace) |
| 538 | fprintf(trace,"[fpk:%o]",c); |
| 539 | #endif |
| 540 | return(c); |
| 541 | } |
| 542 | |
| 543 | trapalarm() { |
| 544 | alarm(0); |
| 545 | longjmp(vreslab,1); |
| 546 | } |