| 1 | /* Copyright (c) 1980 Regents of the University of California */ |
| 2 | static char *sccsid = "@(#)ex_subr.c 6.3 %G%"; |
| 3 | #include "ex.h" |
| 4 | #include "ex_re.h" |
| 5 | #include "ex_tty.h" |
| 6 | #include "ex_vis.h" |
| 7 | |
| 8 | /* |
| 9 | * Random routines, in alphabetical order. |
| 10 | */ |
| 11 | |
| 12 | any(c, s) |
| 13 | int c; |
| 14 | register char *s; |
| 15 | { |
| 16 | register int x; |
| 17 | |
| 18 | while (x = *s++) |
| 19 | if (x == c) |
| 20 | return (1); |
| 21 | return (0); |
| 22 | } |
| 23 | |
| 24 | backtab(i) |
| 25 | register int i; |
| 26 | { |
| 27 | register int j; |
| 28 | |
| 29 | j = i % value(SHIFTWIDTH); |
| 30 | if (j == 0) |
| 31 | j = value(SHIFTWIDTH); |
| 32 | i -= j; |
| 33 | if (i < 0) |
| 34 | i = 0; |
| 35 | return (i); |
| 36 | } |
| 37 | |
| 38 | change() |
| 39 | { |
| 40 | |
| 41 | tchng++; |
| 42 | chng = tchng; |
| 43 | } |
| 44 | |
| 45 | /* |
| 46 | * Column returns the number of |
| 47 | * columns occupied by printing the |
| 48 | * characters through position cp of the |
| 49 | * current line. |
| 50 | */ |
| 51 | column(cp) |
| 52 | register char *cp; |
| 53 | { |
| 54 | |
| 55 | if (cp == 0) |
| 56 | cp = &linebuf[LBSIZE - 2]; |
| 57 | return (qcolumn(cp, (char *) 0)); |
| 58 | } |
| 59 | |
| 60 | /* |
| 61 | * Ignore a comment to the end of the line. |
| 62 | * This routine eats the trailing newline so don't call newline(). |
| 63 | */ |
| 64 | comment() |
| 65 | { |
| 66 | register int c; |
| 67 | |
| 68 | do { |
| 69 | c = getchar(); |
| 70 | } while (c != '\n' && c != EOF); |
| 71 | if (c == EOF) |
| 72 | ungetchar(c); |
| 73 | } |
| 74 | |
| 75 | Copy(to, from, size) |
| 76 | register char *from, *to; |
| 77 | register int size; |
| 78 | { |
| 79 | |
| 80 | if (size > 0) |
| 81 | do |
| 82 | *to++ = *from++; |
| 83 | while (--size > 0); |
| 84 | } |
| 85 | |
| 86 | copyw(to, from, size) |
| 87 | register line *from, *to; |
| 88 | register int size; |
| 89 | { |
| 90 | |
| 91 | if (size > 0) |
| 92 | do |
| 93 | *to++ = *from++; |
| 94 | while (--size > 0); |
| 95 | } |
| 96 | |
| 97 | copywR(to, from, size) |
| 98 | register line *from, *to; |
| 99 | register int size; |
| 100 | { |
| 101 | |
| 102 | while (--size >= 0) |
| 103 | to[size] = from[size]; |
| 104 | } |
| 105 | |
| 106 | ctlof(c) |
| 107 | int c; |
| 108 | { |
| 109 | |
| 110 | return (c == TRIM ? '?' : c | ('A' - 1)); |
| 111 | } |
| 112 | |
| 113 | dingdong() |
| 114 | { |
| 115 | |
| 116 | if (VB) |
| 117 | putpad(VB); |
| 118 | else if (value(ERRORBELLS)) |
| 119 | putch('\207'); |
| 120 | } |
| 121 | |
| 122 | fixindent(indent) |
| 123 | int indent; |
| 124 | { |
| 125 | register int i; |
| 126 | register char *cp; |
| 127 | |
| 128 | i = whitecnt(genbuf); |
| 129 | cp = vpastwh(genbuf); |
| 130 | if (*cp == 0 && i == indent && linebuf[0] == 0) { |
| 131 | genbuf[0] = 0; |
| 132 | return (i); |
| 133 | } |
| 134 | CP(genindent(i), cp); |
| 135 | return (i); |
| 136 | } |
| 137 | |
| 138 | filioerr(cp) |
| 139 | char *cp; |
| 140 | { |
| 141 | register int oerrno = errno; |
| 142 | |
| 143 | lprintf("\"%s\"", cp); |
| 144 | errno = oerrno; |
| 145 | syserror(); |
| 146 | } |
| 147 | |
| 148 | char * |
| 149 | genindent(indent) |
| 150 | register int indent; |
| 151 | { |
| 152 | register char *cp; |
| 153 | |
| 154 | for (cp = genbuf; indent >= value(TABSTOP); indent -= value(TABSTOP)) |
| 155 | *cp++ = '\t'; |
| 156 | for (; indent > 0; indent--) |
| 157 | *cp++ = ' '; |
| 158 | return (cp); |
| 159 | } |
| 160 | |
| 161 | getDOT() |
| 162 | { |
| 163 | |
| 164 | getline(*dot); |
| 165 | } |
| 166 | |
| 167 | line * |
| 168 | getmark(c) |
| 169 | register int c; |
| 170 | { |
| 171 | register line *addr; |
| 172 | |
| 173 | for (addr = one; addr <= dol; addr++) |
| 174 | if (names[c - 'a'] == (*addr &~ 01)) { |
| 175 | return (addr); |
| 176 | } |
| 177 | return (0); |
| 178 | } |
| 179 | |
| 180 | getn(cp) |
| 181 | register char *cp; |
| 182 | { |
| 183 | register int i = 0; |
| 184 | |
| 185 | while (isdigit(*cp)) |
| 186 | i = i * 10 + *cp++ - '0'; |
| 187 | if (*cp) |
| 188 | return (0); |
| 189 | return (i); |
| 190 | } |
| 191 | |
| 192 | ignnEOF() |
| 193 | { |
| 194 | register int c = getchar(); |
| 195 | |
| 196 | if (c == EOF) |
| 197 | ungetchar(c); |
| 198 | else if (c=='"') |
| 199 | comment(); |
| 200 | } |
| 201 | |
| 202 | iswhite(c) |
| 203 | int c; |
| 204 | { |
| 205 | |
| 206 | return (c == ' ' || c == '\t'); |
| 207 | } |
| 208 | |
| 209 | junk(c) |
| 210 | register int c; |
| 211 | { |
| 212 | |
| 213 | if (c && !value(BEAUTIFY)) |
| 214 | return (0); |
| 215 | if (c >= ' ' && c != TRIM) |
| 216 | return (0); |
| 217 | switch (c) { |
| 218 | |
| 219 | case '\t': |
| 220 | case '\n': |
| 221 | case '\f': |
| 222 | return (0); |
| 223 | |
| 224 | default: |
| 225 | return (1); |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | killed() |
| 230 | { |
| 231 | |
| 232 | killcnt(addr2 - addr1 + 1); |
| 233 | } |
| 234 | |
| 235 | killcnt(cnt) |
| 236 | register int cnt; |
| 237 | { |
| 238 | |
| 239 | if (inopen) { |
| 240 | notecnt = cnt; |
| 241 | notenam = notesgn = ""; |
| 242 | return; |
| 243 | } |
| 244 | if (!notable(cnt)) |
| 245 | return; |
| 246 | printf("%d lines", cnt); |
| 247 | if (value(TERSE) == 0) { |
| 248 | printf(" %c%s", Command[0] | ' ', Command + 1); |
| 249 | if (Command[strlen(Command) - 1] != 'e') |
| 250 | putchar('e'); |
| 251 | putchar('d'); |
| 252 | } |
| 253 | putNFL(); |
| 254 | } |
| 255 | |
| 256 | lineno(a) |
| 257 | line *a; |
| 258 | { |
| 259 | |
| 260 | return (a - zero); |
| 261 | } |
| 262 | |
| 263 | lineDOL() |
| 264 | { |
| 265 | |
| 266 | return (lineno(dol)); |
| 267 | } |
| 268 | |
| 269 | lineDOT() |
| 270 | { |
| 271 | |
| 272 | return (lineno(dot)); |
| 273 | } |
| 274 | |
| 275 | markDOT() |
| 276 | { |
| 277 | |
| 278 | markpr(dot); |
| 279 | } |
| 280 | |
| 281 | markpr(which) |
| 282 | line *which; |
| 283 | { |
| 284 | |
| 285 | if ((inglobal == 0 || inopen) && which <= endcore) { |
| 286 | names['z'-'a'+1] = *which & ~01; |
| 287 | if (inopen) |
| 288 | ncols['z'-'a'+1] = cursor; |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | markreg(c) |
| 293 | register int c; |
| 294 | { |
| 295 | |
| 296 | if (c == '\'' || c == '`') |
| 297 | return ('z' + 1); |
| 298 | if (c >= 'a' && c <= 'z') |
| 299 | return (c); |
| 300 | return (0); |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * Mesg decodes the terse/verbose strings. Thus |
| 305 | * 'xxx@yyy' -> 'xxx' if terse, else 'xxx yyy' |
| 306 | * 'xxx|yyy' -> 'xxx' if terse, else 'yyy' |
| 307 | * All others map to themselves. |
| 308 | */ |
| 309 | char * |
| 310 | mesg(str) |
| 311 | register char *str; |
| 312 | { |
| 313 | register char *cp; |
| 314 | |
| 315 | str = strcpy(genbuf, str); |
| 316 | for (cp = str; *cp; cp++) |
| 317 | switch (*cp) { |
| 318 | |
| 319 | case '@': |
| 320 | if (value(TERSE)) |
| 321 | *cp = 0; |
| 322 | else |
| 323 | *cp = ' '; |
| 324 | break; |
| 325 | |
| 326 | case '|': |
| 327 | if (value(TERSE) == 0) |
| 328 | return (cp + 1); |
| 329 | *cp = 0; |
| 330 | break; |
| 331 | } |
| 332 | return (str); |
| 333 | } |
| 334 | |
| 335 | /*VARARGS2*/ |
| 336 | merror(seekpt, i) |
| 337 | #ifdef VMUNIX |
| 338 | char *seekpt; |
| 339 | #else |
| 340 | # ifdef lint |
| 341 | char *seekpt; |
| 342 | # else |
| 343 | int seekpt; |
| 344 | # endif |
| 345 | #endif |
| 346 | int i; |
| 347 | { |
| 348 | register char *cp = linebuf; |
| 349 | |
| 350 | if (seekpt == 0) |
| 351 | return; |
| 352 | merror1(seekpt); |
| 353 | if (*cp == '\n') |
| 354 | putnl(), cp++; |
| 355 | if (inopen && CE) |
| 356 | vclreol(); |
| 357 | if (SO && SE) |
| 358 | putpad(SO); |
| 359 | printf(mesg(cp), i); |
| 360 | if (SO && SE) |
| 361 | putpad(SE); |
| 362 | } |
| 363 | |
| 364 | merror1(seekpt) |
| 365 | #ifdef VMUNIX |
| 366 | char *seekpt; |
| 367 | #else |
| 368 | # ifdef lint |
| 369 | char *seekpt; |
| 370 | # else |
| 371 | int seekpt; |
| 372 | # endif |
| 373 | #endif |
| 374 | { |
| 375 | |
| 376 | #ifdef VMUNIX |
| 377 | strcpy(linebuf, seekpt); |
| 378 | #else |
| 379 | lseek(erfile, (long) seekpt, 0); |
| 380 | if (read(erfile, linebuf, 128) < 2) |
| 381 | CP(linebuf, "ERROR"); |
| 382 | #endif |
| 383 | } |
| 384 | |
| 385 | morelines() |
| 386 | { |
| 387 | |
| 388 | if ((int) sbrk(1024 * sizeof (line)) == -1) |
| 389 | return (-1); |
| 390 | endcore += 1024; |
| 391 | return (0); |
| 392 | } |
| 393 | |
| 394 | nonzero() |
| 395 | { |
| 396 | |
| 397 | if (addr1 == zero) { |
| 398 | notempty(); |
| 399 | error("Nonzero address required@on this command"); |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | notable(i) |
| 404 | int i; |
| 405 | { |
| 406 | |
| 407 | return (hush == 0 && !inglobal && i > value(REPORT)); |
| 408 | } |
| 409 | |
| 410 | |
| 411 | notempty() |
| 412 | { |
| 413 | |
| 414 | if (dol == zero) |
| 415 | error("No lines@in the buffer"); |
| 416 | } |
| 417 | |
| 418 | |
| 419 | netchHAD(cnt) |
| 420 | int cnt; |
| 421 | { |
| 422 | |
| 423 | netchange(lineDOL() - cnt); |
| 424 | } |
| 425 | |
| 426 | netchange(i) |
| 427 | register int i; |
| 428 | { |
| 429 | register char *cp; |
| 430 | |
| 431 | if (i > 0) |
| 432 | notesgn = cp = "more "; |
| 433 | else |
| 434 | notesgn = cp = "fewer ", i = -i; |
| 435 | if (inopen) { |
| 436 | notecnt = i; |
| 437 | notenam = ""; |
| 438 | return; |
| 439 | } |
| 440 | if (!notable(i)) |
| 441 | return; |
| 442 | printf(mesg("%d %slines@in file after %s"), i, cp, Command); |
| 443 | putNFL(); |
| 444 | } |
| 445 | |
| 446 | putmark(addr) |
| 447 | line *addr; |
| 448 | { |
| 449 | |
| 450 | putmk1(addr, putline()); |
| 451 | } |
| 452 | |
| 453 | putmk1(addr, n) |
| 454 | register line *addr; |
| 455 | int n; |
| 456 | { |
| 457 | register line *markp; |
| 458 | register oldglobmk; |
| 459 | |
| 460 | oldglobmk = *addr & 1; |
| 461 | *addr &= ~1; |
| 462 | for (markp = (anymarks ? names : &names['z'-'a'+1]); |
| 463 | markp <= &names['z'-'a'+1]; markp++) |
| 464 | if (*markp == *addr) |
| 465 | *markp = n; |
| 466 | *addr = n | oldglobmk; |
| 467 | } |
| 468 | |
| 469 | char * |
| 470 | plural(i) |
| 471 | long i; |
| 472 | { |
| 473 | |
| 474 | return (i == 1 ? "" : "s"); |
| 475 | } |
| 476 | |
| 477 | int qcount(); |
| 478 | short vcntcol; |
| 479 | |
| 480 | qcolumn(lim, gp) |
| 481 | register char *lim, *gp; |
| 482 | { |
| 483 | register int x; |
| 484 | int (*OO)(); |
| 485 | |
| 486 | OO = Outchar; |
| 487 | Outchar = qcount; |
| 488 | vcntcol = 0; |
| 489 | if (lim != NULL) |
| 490 | x = lim[1], lim[1] = 0; |
| 491 | pline(0); |
| 492 | if (lim != NULL) |
| 493 | lim[1] = x; |
| 494 | if (gp) |
| 495 | while (*gp) |
| 496 | putchar(*gp++); |
| 497 | Outchar = OO; |
| 498 | return (vcntcol); |
| 499 | } |
| 500 | |
| 501 | int |
| 502 | qcount(c) |
| 503 | int c; |
| 504 | { |
| 505 | |
| 506 | if (c == '\t') { |
| 507 | vcntcol += value(TABSTOP) - vcntcol % value(TABSTOP); |
| 508 | return; |
| 509 | } |
| 510 | vcntcol++; |
| 511 | } |
| 512 | |
| 513 | reverse(a1, a2) |
| 514 | register line *a1, *a2; |
| 515 | { |
| 516 | register line t; |
| 517 | |
| 518 | for (;;) { |
| 519 | t = *--a2; |
| 520 | if (a2 <= a1) |
| 521 | return; |
| 522 | *a2 = *a1; |
| 523 | *a1++ = t; |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | save(a1, a2) |
| 528 | line *a1; |
| 529 | register line *a2; |
| 530 | { |
| 531 | register int more; |
| 532 | |
| 533 | if (!FIXUNDO) |
| 534 | return; |
| 535 | #ifdef TRACE |
| 536 | if (trace) |
| 537 | vudump("before save"); |
| 538 | #endif |
| 539 | undkind = UNDNONE; |
| 540 | undadot = dot; |
| 541 | more = (a2 - a1 + 1) - (unddol - dol); |
| 542 | while (more > (endcore - truedol)) |
| 543 | if (morelines() < 0) |
| 544 | error("Out of memory@saving lines for undo - try using ed"); |
| 545 | if (more) |
| 546 | (*(more > 0 ? copywR : copyw))(unddol + more + 1, unddol + 1, |
| 547 | (truedol - unddol)); |
| 548 | unddol += more; |
| 549 | truedol += more; |
| 550 | copyw(dol + 1, a1, a2 - a1 + 1); |
| 551 | undkind = UNDALL; |
| 552 | unddel = a1 - 1; |
| 553 | undap1 = a1; |
| 554 | undap2 = a2 + 1; |
| 555 | #ifdef TRACE |
| 556 | if (trace) |
| 557 | vudump("after save"); |
| 558 | #endif |
| 559 | } |
| 560 | |
| 561 | save12() |
| 562 | { |
| 563 | |
| 564 | save(addr1, addr2); |
| 565 | } |
| 566 | |
| 567 | saveall() |
| 568 | { |
| 569 | |
| 570 | save(one, dol); |
| 571 | } |
| 572 | |
| 573 | span() |
| 574 | { |
| 575 | |
| 576 | return (addr2 - addr1 + 1); |
| 577 | } |
| 578 | |
| 579 | sync() |
| 580 | { |
| 581 | |
| 582 | chng = 0; |
| 583 | tchng = 0; |
| 584 | xchng = 0; |
| 585 | } |
| 586 | |
| 587 | |
| 588 | skipwh() |
| 589 | { |
| 590 | register int wh; |
| 591 | |
| 592 | wh = 0; |
| 593 | while (iswhite(peekchar())) { |
| 594 | wh++; |
| 595 | ignchar(); |
| 596 | } |
| 597 | return (wh); |
| 598 | } |
| 599 | |
| 600 | /*VARARGS2*/ |
| 601 | smerror(seekpt, cp) |
| 602 | #ifdef lint |
| 603 | char *seekpt; |
| 604 | #else |
| 605 | int seekpt; |
| 606 | #endif |
| 607 | char *cp; |
| 608 | { |
| 609 | |
| 610 | if (seekpt == 0) |
| 611 | return; |
| 612 | merror1(seekpt); |
| 613 | if (inopen && CE) |
| 614 | vclreol(); |
| 615 | if (SO && SE) |
| 616 | putpad(SO); |
| 617 | lprintf(mesg(linebuf), cp); |
| 618 | if (SO && SE) |
| 619 | putpad(SE); |
| 620 | } |
| 621 | |
| 622 | #define std_nerrs (sizeof std_errlist / sizeof std_errlist[0]) |
| 623 | |
| 624 | #define error(i) i |
| 625 | |
| 626 | #ifdef lint |
| 627 | char *std_errlist[] = { |
| 628 | #else |
| 629 | # ifdef VMUNIX |
| 630 | char *std_errlist[] = { |
| 631 | # else |
| 632 | short std_errlist[] = { |
| 633 | # endif |
| 634 | #endif |
| 635 | error("Error 0"), |
| 636 | error("Not super-user"), |
| 637 | error("No such file or directory"), |
| 638 | error("No such process"), |
| 639 | error("Interrupted system call"), |
| 640 | error("Physical I/O error"), |
| 641 | error("No such device or address"), |
| 642 | error("Argument list too long"), |
| 643 | error("Exec format error"), |
| 644 | error("Bad file number"), |
| 645 | error("No children"), |
| 646 | error("No more processes"), |
| 647 | error("Not enough core"), |
| 648 | error("Permission denied"), |
| 649 | error("Bad address"), |
| 650 | error("Block device required"), |
| 651 | error("Mount device busy"), |
| 652 | error("File exists"), |
| 653 | error("Cross-device link"), |
| 654 | error("No such device"), |
| 655 | error("Not a directory"), |
| 656 | error("Is a directory"), |
| 657 | error("Invalid argument"), |
| 658 | error("File table overflow"), |
| 659 | error("Too many open files"), |
| 660 | error("Not a typewriter"), |
| 661 | error("Text file busy"), |
| 662 | error("File too large"), |
| 663 | error("No space left on device"), |
| 664 | error("Illegal seek"), |
| 665 | error("Read-only file system"), |
| 666 | error("Too many links"), |
| 667 | error("Broken pipe"), |
| 668 | #ifndef V6 |
| 669 | error("Math argument"), |
| 670 | error("Result too large"), |
| 671 | #endif |
| 672 | error("Quota exceeded") /* Berkeley quota systems only */ |
| 673 | }; |
| 674 | |
| 675 | #undef error |
| 676 | |
| 677 | char * |
| 678 | strend(cp) |
| 679 | register char *cp; |
| 680 | { |
| 681 | |
| 682 | while (*cp) |
| 683 | cp++; |
| 684 | return (cp); |
| 685 | } |
| 686 | |
| 687 | strcLIN(dp) |
| 688 | char *dp; |
| 689 | { |
| 690 | |
| 691 | CP(linebuf, dp); |
| 692 | } |
| 693 | |
| 694 | syserror() |
| 695 | { |
| 696 | register int e = errno; |
| 697 | |
| 698 | dirtcnt = 0; |
| 699 | putchar(' '); |
| 700 | edited = 0; /* for temp file errors, for example */ |
| 701 | if (e >= 0 && errno <= std_nerrs) |
| 702 | error(std_errlist[e]); |
| 703 | else |
| 704 | error("System error %d", e); |
| 705 | } |
| 706 | |
| 707 | /* |
| 708 | * Return the column number that results from being in column col and |
| 709 | * hitting a tab, where tabs are set every ts columns. Work right for |
| 710 | * the case where col > COLUMNS, even if ts does not divide COLUMNS. |
| 711 | */ |
| 712 | tabcol(col, ts) |
| 713 | int col, ts; |
| 714 | { |
| 715 | int offset, result; |
| 716 | |
| 717 | if (col >= COLUMNS) { |
| 718 | offset = COLUMNS * (col/COLUMNS); |
| 719 | col -= offset; |
| 720 | } else |
| 721 | offset = 0; |
| 722 | result = col + ts - (col % ts) + offset; |
| 723 | return (result); |
| 724 | } |
| 725 | |
| 726 | char * |
| 727 | vfindcol(i) |
| 728 | int i; |
| 729 | { |
| 730 | register char *cp; |
| 731 | register int (*OO)() = Outchar; |
| 732 | |
| 733 | Outchar = qcount; |
| 734 | ignore(qcolumn(linebuf - 1, NOSTR)); |
| 735 | for (cp = linebuf; *cp && vcntcol < i; cp++) |
| 736 | putchar(*cp); |
| 737 | if (cp != linebuf) |
| 738 | cp--; |
| 739 | Outchar = OO; |
| 740 | return (cp); |
| 741 | } |
| 742 | |
| 743 | char * |
| 744 | vskipwh(cp) |
| 745 | register char *cp; |
| 746 | { |
| 747 | |
| 748 | while (iswhite(*cp) && cp[1]) |
| 749 | cp++; |
| 750 | return (cp); |
| 751 | } |
| 752 | |
| 753 | |
| 754 | char * |
| 755 | vpastwh(cp) |
| 756 | register char *cp; |
| 757 | { |
| 758 | |
| 759 | while (iswhite(*cp)) |
| 760 | cp++; |
| 761 | return (cp); |
| 762 | } |
| 763 | |
| 764 | whitecnt(cp) |
| 765 | register char *cp; |
| 766 | { |
| 767 | register int i; |
| 768 | |
| 769 | i = 0; |
| 770 | for (;;) |
| 771 | switch (*cp++) { |
| 772 | |
| 773 | case '\t': |
| 774 | i += value(TABSTOP) - i % value(TABSTOP); |
| 775 | break; |
| 776 | |
| 777 | case ' ': |
| 778 | i++; |
| 779 | break; |
| 780 | |
| 781 | default: |
| 782 | return (i); |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | #ifdef lint |
| 787 | Ignore(a) |
| 788 | char *a; |
| 789 | { |
| 790 | |
| 791 | a = a; |
| 792 | } |
| 793 | |
| 794 | Ignorf(a) |
| 795 | int (*a)(); |
| 796 | { |
| 797 | |
| 798 | a = a; |
| 799 | } |
| 800 | #endif |
| 801 | |
| 802 | markit(addr) |
| 803 | line *addr; |
| 804 | { |
| 805 | |
| 806 | if (addr != dot && addr >= one && addr <= dol) |
| 807 | markDOT(); |
| 808 | } |
| 809 | |
| 810 | /* |
| 811 | * The following code is defensive programming against a bug in the |
| 812 | * pdp-11 overlay implementation. Sometimes it goes nuts and asks |
| 813 | * for an overlay with some garbage number, which generates an emt |
| 814 | * trap. This is a less than elegant solution, but it is somewhat |
| 815 | * better than core dumping and losing your work, leaving your tty |
| 816 | * in a weird state, etc. |
| 817 | */ |
| 818 | int _ovno; |
| 819 | onemt() |
| 820 | { |
| 821 | int oovno; |
| 822 | |
| 823 | signal(SIGEMT, onemt); |
| 824 | oovno = _ovno; |
| 825 | /* 2 and 3 are valid on 11/40 type vi, so */ |
| 826 | if (_ovno < 0 || _ovno > 3) |
| 827 | _ovno = 0; |
| 828 | error("emt trap, _ovno is %d @ - try again"); |
| 829 | } |
| 830 | |
| 831 | /* |
| 832 | * When a hangup occurs our actions are similar to a preserve |
| 833 | * command. If the buffer has not been [Modified], then we do |
| 834 | * nothing but remove the temporary files and exit. |
| 835 | * Otherwise, we sync the temp file and then attempt a preserve. |
| 836 | * If the preserve succeeds, we unlink our temp files. |
| 837 | * If the preserve fails, we leave the temp files as they are |
| 838 | * as they are a backup even without preservation if they |
| 839 | * are not removed. |
| 840 | */ |
| 841 | onhup() |
| 842 | { |
| 843 | |
| 844 | /* |
| 845 | * USG tty driver can send multiple HUP's!! |
| 846 | */ |
| 847 | signal(SIGINT, SIG_IGN); |
| 848 | signal(SIGHUP, SIG_IGN); |
| 849 | if (chng == 0) { |
| 850 | cleanup(1); |
| 851 | exit(0); |
| 852 | } |
| 853 | if (setexit() == 0) { |
| 854 | if (preserve()) { |
| 855 | cleanup(1); |
| 856 | exit(0); |
| 857 | } |
| 858 | } |
| 859 | exit(1); |
| 860 | } |
| 861 | |
| 862 | /* |
| 863 | * An interrupt occurred. Drain any output which |
| 864 | * is still in the output buffering pipeline. |
| 865 | * Catch interrupts again. Unless we are in visual |
| 866 | * reset the output state (out of -nl mode, e.g). |
| 867 | * Then like a normal error (with the \n before Interrupt |
| 868 | * suppressed in visual mode). |
| 869 | */ |
| 870 | onintr() |
| 871 | { |
| 872 | |
| 873 | #ifndef CBREAK |
| 874 | signal(SIGINT, onintr); |
| 875 | #else |
| 876 | signal(SIGINT, inopen ? vintr : onintr); |
| 877 | #endif |
| 878 | draino(); |
| 879 | if (!inopen) { |
| 880 | pstop(); |
| 881 | setlastchar('\n'); |
| 882 | #ifdef CBREAK |
| 883 | } |
| 884 | #else |
| 885 | } else |
| 886 | vraw(); |
| 887 | #endif |
| 888 | error("\nInterrupt" + inopen); |
| 889 | } |
| 890 | |
| 891 | /* |
| 892 | * If we are interruptible, enable interrupts again. |
| 893 | * In some critical sections we turn interrupts off, |
| 894 | * but not very often. |
| 895 | */ |
| 896 | setrupt() |
| 897 | { |
| 898 | |
| 899 | if (ruptible) { |
| 900 | #ifndef CBREAK |
| 901 | signal(SIGINT, onintr); |
| 902 | #else |
| 903 | signal(SIGINT, inopen ? vintr : onintr); |
| 904 | #endif |
| 905 | #ifdef SIGTSTP |
| 906 | if (dosusp) |
| 907 | signal(SIGTSTP, onsusp); |
| 908 | #endif |
| 909 | } |
| 910 | } |
| 911 | |
| 912 | preserve() |
| 913 | { |
| 914 | |
| 915 | #ifdef VMUNIX |
| 916 | tflush(); |
| 917 | #endif |
| 918 | synctmp(); |
| 919 | pid = fork(); |
| 920 | if (pid < 0) |
| 921 | return (0); |
| 922 | if (pid == 0) { |
| 923 | close(0); |
| 924 | dup(tfile); |
| 925 | execl(EXPRESERVE, "expreserve", (char *) 0); |
| 926 | exit(1); |
| 927 | } |
| 928 | waitfor(); |
| 929 | if (rpid == pid && status == 0) |
| 930 | return (1); |
| 931 | return (0); |
| 932 | } |
| 933 | |
| 934 | #ifndef V6 |
| 935 | exit(i) |
| 936 | int i; |
| 937 | { |
| 938 | |
| 939 | # ifdef TRACE |
| 940 | if (trace) |
| 941 | fclose(trace); |
| 942 | # endif |
| 943 | _exit(i); |
| 944 | } |
| 945 | #endif |
| 946 | |
| 947 | #ifdef SIGTSTP |
| 948 | /* |
| 949 | * We have just gotten a susp. Suspend and prepare to resume. |
| 950 | */ |
| 951 | onsusp() |
| 952 | { |
| 953 | ttymode f; |
| 954 | |
| 955 | f = setty(normf); |
| 956 | vnfl(); |
| 957 | putpad(TE); |
| 958 | flush(); |
| 959 | |
| 960 | signal(SIGTSTP, SIG_DFL); |
| 961 | kill(0, SIGTSTP); |
| 962 | |
| 963 | /* the pc stops here */ |
| 964 | |
| 965 | signal(SIGTSTP, onsusp); |
| 966 | vcontin(0); |
| 967 | setty(f); |
| 968 | if (!inopen) |
| 969 | error(0); |
| 970 | else { |
| 971 | if (vcnt < 0) { |
| 972 | vcnt = -vcnt; |
| 973 | if (state == VISUAL) |
| 974 | vclear(); |
| 975 | else if (state == CRTOPEN) |
| 976 | vcnt = 0; |
| 977 | } |
| 978 | vdirty(0, LINES); |
| 979 | vrepaint(cursor); |
| 980 | } |
| 981 | } |