1 /* main.c: This file contains the main control and user-interface routines 2 for the ed line editor. */ 3 /*- 4 * Copyright (c) 1993 Andrew Moore, Talke Studio. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * CREDITS 31 * 32 * This program is based on the editor algorithm described in 33 * Brian W. Kernighan and P. J. Plauger's book "Software Tools 34 * in Pascal," Addison-Wesley, 1981. 35 * 36 * The buffering algorithm is attributed to Rodney Ruddock of 37 * the University of Guelph, Guelph, Ontario. 38 * 39 */ 40 41 #include <sys/types.h> 42 43 #include <sys/ioctl.h> 44 #include <sys/wait.h> 45 #include <ctype.h> 46 #include <locale.h> 47 #include <pwd.h> 48 #include <setjmp.h> 49 50 #include "ed.h" 51 52 53 #ifdef _POSIX_SOURCE 54 static sigjmp_buf env; 55 #else 56 static jmp_buf env; 57 #endif 58 59 /* static buffers */ 60 char stdinbuf[1]; /* stdin buffer */ 61 static char *shcmd; /* shell command buffer */ 62 static int shcmdsz; /* shell command buffer size */ 63 static int shcmdi; /* shell command buffer index */ 64 char *ibuf; /* ed command-line buffer */ 65 int ibufsz; /* ed command-line buffer size */ 66 char *ibufp; /* pointer to ed command-line buffer */ 67 68 /* global flags */ 69 static int garrulous = 0; /* if set, print all error messages */ 70 int isbinary; /* if set, buffer contains ASCII NULs */ 71 int isglobal; /* if set, doing a global command */ 72 int modified; /* if set, buffer modified since last write */ 73 int mutex = 0; /* if set, signals set "sigflags" */ 74 static int red = 0; /* if set, restrict shell/directory access */ 75 int scripted = 0; /* if set, suppress diagnostics */ 76 int sigflags = 0; /* if set, signals received while mutex set */ 77 static int sigactive = 0; /* if set, signal handlers are enabled */ 78 79 static char old_filename[PATH_MAX] = ""; /* default filename */ 80 long current_addr; /* current address in editor buffer */ 81 long addr_last; /* last address in editor buffer */ 82 int lineno; /* script line number */ 83 static const char *prompt; /* command-line prompt */ 84 static const char *dps = "*"; /* default command-line prompt */ 85 86 static const char *usage = "usage: %s [-] [-sx] [-p string] [file]\n"; 87 88 /* ed: line editor */ 89 int 90 main(volatile int argc, char ** volatile argv) 91 { 92 int c, n; 93 long status = 0; 94 95 (void)setlocale(LC_ALL, ""); 96 97 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 98 top: 99 while ((c = getopt(argc, argv, "p:sx")) != -1) 100 switch(c) { 101 case 'p': /* set prompt */ 102 prompt = optarg; 103 break; 104 case 's': /* run script */ 105 scripted = 1; 106 break; 107 case 'x': /* use crypt */ 108 fprintf(stderr, "crypt unavailable\n?\n"); 109 break; 110 111 default: 112 fprintf(stderr, usage, red ? "red" : "ed"); 113 exit(1); 114 } 115 argv += optind; 116 argc -= optind; 117 if (argc && **argv == '-') { 118 scripted = 1; 119 if (argc > 1) { 120 optind = 1; 121 goto top; 122 } 123 argv++; 124 argc--; 125 } 126 /* assert: reliable signals! */ 127 #ifdef SIGWINCH 128 handle_winch(SIGWINCH); 129 if (isatty(0)) signal(SIGWINCH, handle_winch); 130 #endif 131 signal(SIGHUP, signal_hup); 132 signal(SIGQUIT, SIG_IGN); 133 signal(SIGINT, signal_int); 134 #ifdef _POSIX_SOURCE 135 if ((status = sigsetjmp(env, 1))) 136 #else 137 if ((status = setjmp(env))) 138 #endif 139 { 140 fputs("\n?\n", stderr); 141 errmsg = "interrupt"; 142 } else { 143 init_buffers(); 144 sigactive = 1; /* enable signal handlers */ 145 if (argc && **argv && is_legal_filename(*argv)) { 146 if (read_file(*argv, 0) < 0 && !isatty(0)) 147 quit(2); 148 else if (**argv != '!') 149 if (strlcpy(old_filename, *argv, sizeof(old_filename)) 150 >= sizeof(old_filename)) 151 quit(2); 152 } else if (argc) { 153 fputs("?\n", stderr); 154 if (**argv == '\0') 155 errmsg = "invalid filename"; 156 if (!isatty(0)) 157 quit(2); 158 } 159 } 160 for (;;) { 161 if (status < 0 && garrulous) 162 fprintf(stderr, "%s\n", errmsg); 163 if (prompt) { 164 printf("%s", prompt); 165 fflush(stdout); 166 } 167 if ((n = get_tty_line()) < 0) { 168 status = ERR; 169 continue; 170 } else if (n == 0) { 171 if (modified && !scripted) { 172 fputs("?\n", stderr); 173 errmsg = "warning: file modified"; 174 if (!isatty(0)) { 175 if (garrulous) 176 fprintf(stderr, 177 "script, line %d: %s\n", 178 lineno, errmsg); 179 quit(2); 180 } 181 clearerr(stdin); 182 modified = 0; 183 status = EMOD; 184 continue; 185 } else 186 quit(0); 187 } else if (ibuf[n - 1] != '\n') { 188 /* discard line */ 189 errmsg = "unexpected end-of-file"; 190 clearerr(stdin); 191 status = ERR; 192 continue; 193 } 194 isglobal = 0; 195 if ((status = extract_addr_range()) >= 0 && 196 (status = exec_command()) >= 0) 197 if (!status || 198 (status = display_lines(current_addr, current_addr, 199 status)) >= 0) 200 continue; 201 switch (status) { 202 case EOF: 203 quit(0); 204 case EMOD: 205 modified = 0; 206 fputs("?\n", stderr); /* give warning */ 207 errmsg = "warning: file modified"; 208 if (!isatty(0)) { 209 if (garrulous) 210 fprintf(stderr, "script, line %d: %s\n", 211 lineno, errmsg); 212 quit(2); 213 } 214 break; 215 case FATAL: 216 if (!isatty(0)) { 217 if (garrulous) 218 fprintf(stderr, "script, line %d: %s\n", 219 lineno, errmsg); 220 } else if (garrulous) 221 fprintf(stderr, "%s\n", errmsg); 222 quit(3); 223 default: 224 fputs("?\n", stderr); 225 if (!isatty(0)) { 226 if (garrulous) 227 fprintf(stderr, "script, line %d: %s\n", 228 lineno, errmsg); 229 quit(2); 230 } 231 break; 232 } 233 } 234 /*NOTREACHED*/ 235 } 236 237 long first_addr, second_addr; 238 static long addr_cnt; 239 240 /* extract_addr_range: get line addresses from the command buffer until an 241 illegal address is seen; return status */ 242 int 243 extract_addr_range(void) 244 { 245 long addr; 246 247 addr_cnt = 0; 248 first_addr = second_addr = current_addr; 249 while ((addr = next_addr()) >= 0) { 250 addr_cnt++; 251 first_addr = second_addr; 252 second_addr = addr; 253 if (*ibufp != ',' && *ibufp != ';') 254 break; 255 else if (*ibufp++ == ';') 256 current_addr = addr; 257 } 258 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 259 first_addr = second_addr; 260 return (addr == ERR) ? ERR : 0; 261 } 262 263 264 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++ 265 266 #define MUST_BE_FIRST() do { \ 267 if (!first) { \ 268 errmsg = "invalid address"; \ 269 return ERR; \ 270 } \ 271 } while (0) 272 273 /* next_addr: return the next line address in the command buffer */ 274 long 275 next_addr(void) 276 { 277 const char *hd; 278 long addr = current_addr; 279 long n; 280 int first = 1; 281 int c; 282 283 SKIP_BLANKS(); 284 for (hd = ibufp;; first = 0) 285 switch (c = *ibufp) { 286 case '+': 287 case '\t': 288 case ' ': 289 case '-': 290 case '^': 291 ibufp++; 292 SKIP_BLANKS(); 293 if (isdigit((unsigned char)*ibufp)) { 294 STRTOL(n, ibufp); 295 addr += (c == '-' || c == '^') ? -n : n; 296 } else if (!isspace((unsigned char)c)) 297 addr += (c == '-' || c == '^') ? -1 : 1; 298 break; 299 case '0': case '1': case '2': 300 case '3': case '4': case '5': 301 case '6': case '7': case '8': case '9': 302 MUST_BE_FIRST(); 303 STRTOL(addr, ibufp); 304 break; 305 case '.': 306 case '$': 307 MUST_BE_FIRST(); 308 ibufp++; 309 addr = (c == '.') ? current_addr : addr_last; 310 break; 311 case '/': 312 case '?': 313 MUST_BE_FIRST(); 314 if ((addr = get_matching_node_addr( 315 get_compiled_pattern(), c == '/')) < 0) 316 return ERR; 317 else if (c == *ibufp) 318 ibufp++; 319 break; 320 case '\'': 321 MUST_BE_FIRST(); 322 ibufp++; 323 if ((addr = get_marked_node_addr(*ibufp++)) < 0) 324 return ERR; 325 break; 326 case '%': 327 case ',': 328 case ';': 329 if (first) { 330 ibufp++; 331 addr_cnt++; 332 second_addr = (c == ';') ? current_addr : 1; 333 if ((addr = next_addr()) < 0) 334 addr = addr_last; 335 break; 336 } 337 /* FALLTHROUGH */ 338 default: 339 if (ibufp == hd) 340 return EOF; 341 else if (addr < 0 || addr_last < addr) { 342 errmsg = "invalid address"; 343 return ERR; 344 } else 345 return addr; 346 } 347 /* NOTREACHED */ 348 } 349 350 351 #ifdef BACKWARDS 352 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 353 #define GET_THIRD_ADDR(addr) \ 354 { \ 355 long ol1, ol2; \ 356 \ 357 ol1 = first_addr, ol2 = second_addr; \ 358 if (extract_addr_range() < 0) \ 359 return ERR; \ 360 else if (addr_cnt == 0) { \ 361 errmsg = "destination expected"; \ 362 return ERR; \ 363 } else if (second_addr < 0 || addr_last < second_addr) { \ 364 errmsg = "invalid address"; \ 365 return ERR; \ 366 } \ 367 addr = second_addr; \ 368 first_addr = ol1, second_addr = ol2; \ 369 } 370 #else /* BACKWARDS */ 371 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 372 #define GET_THIRD_ADDR(addr) \ 373 { \ 374 long ol1, ol2; \ 375 \ 376 ol1 = first_addr, ol2 = second_addr; \ 377 if (extract_addr_range() < 0) \ 378 return ERR; \ 379 if (second_addr < 0 || addr_last < second_addr) { \ 380 errmsg = "invalid address"; \ 381 return ERR; \ 382 } \ 383 addr = second_addr; \ 384 first_addr = ol1, second_addr = ol2; \ 385 } 386 #endif 387 388 389 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 390 #define GET_COMMAND_SUFFIX() { \ 391 int done = 0; \ 392 do { \ 393 switch(*ibufp) { \ 394 case 'p': \ 395 gflag |= GPR, ibufp++; \ 396 break; \ 397 case 'l': \ 398 gflag |= GLS, ibufp++; \ 399 break; \ 400 case 'n': \ 401 gflag |= GNP, ibufp++; \ 402 break; \ 403 default: \ 404 done++; \ 405 } \ 406 } while (!done); \ 407 if (*ibufp++ != '\n') { \ 408 errmsg = "invalid command suffix"; \ 409 return ERR; \ 410 } \ 411 } 412 413 414 /* sflags */ 415 #define SGG 001 /* complement previous global substitute suffix */ 416 #define SGP 002 /* complement previous print suffix */ 417 #define SGR 004 /* use last regex instead of last pat */ 418 #define SGF 010 /* repeat last substitution */ 419 420 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 421 422 long rows = 22; /* scroll length: ws_row - 2 */ 423 424 /* exec_command: execute the next command in command buffer; return print 425 request, if any */ 426 int 427 exec_command(void) 428 { 429 static pattern_t *pat = NULL; 430 static int sgflag = 0; 431 static long sgnum = 0; 432 433 pattern_t *tpat; 434 char *fnp; 435 int gflag = 0; 436 int sflags = 0; 437 long addr = 0; 438 int n = 0; 439 int c; 440 441 SKIP_BLANKS(); 442 switch(c = *ibufp++) { 443 case 'a': 444 GET_COMMAND_SUFFIX(); 445 if (!isglobal) clear_undo_stack(); 446 if (append_lines(second_addr) < 0) 447 return ERR; 448 break; 449 case 'c': 450 if (check_addr_range(current_addr, current_addr) < 0) 451 return ERR; 452 GET_COMMAND_SUFFIX(); 453 if (!isglobal) clear_undo_stack(); 454 if (delete_lines(first_addr, second_addr) < 0 || 455 append_lines(current_addr) < 0) 456 return ERR; 457 break; 458 case 'd': 459 if (check_addr_range(current_addr, current_addr) < 0) 460 return ERR; 461 GET_COMMAND_SUFFIX(); 462 if (!isglobal) clear_undo_stack(); 463 if (delete_lines(first_addr, second_addr) < 0) 464 return ERR; 465 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 466 current_addr = addr; 467 break; 468 case 'e': 469 if (modified && !scripted) 470 return EMOD; 471 /* FALLTHROUGH */ 472 case 'E': 473 if (addr_cnt > 0) { 474 errmsg = "unexpected address"; 475 return ERR; 476 } else if (!isspace((unsigned char)*ibufp)) { 477 errmsg = "unexpected command suffix"; 478 return ERR; 479 } else if ((fnp = get_filename()) == NULL) 480 return ERR; 481 GET_COMMAND_SUFFIX(); 482 if (delete_lines(1, addr_last) < 0) 483 return ERR; 484 clear_undo_stack(); 485 if (close_sbuf() < 0) 486 return ERR; 487 else if (open_sbuf() < 0) 488 return FATAL; 489 if (*fnp && *fnp != '!') 490 strlcpy(old_filename, fnp, PATH_MAX); 491 #ifdef BACKWARDS 492 if (*fnp == '\0' && *old_filename == '\0') { 493 errmsg = "no current filename"; 494 return ERR; 495 } 496 #endif 497 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 498 return ERR; 499 clear_undo_stack(); 500 modified = 0; 501 u_current_addr = u_addr_last = -1; 502 break; 503 case 'f': 504 if (addr_cnt > 0) { 505 errmsg = "unexpected address"; 506 return ERR; 507 } else if (!isspace((unsigned char)*ibufp)) { 508 errmsg = "unexpected command suffix"; 509 return ERR; 510 } else if ((fnp = get_filename()) == NULL) 511 return ERR; 512 else if (*fnp == '!') { 513 errmsg = "invalid redirection"; 514 return ERR; 515 } 516 GET_COMMAND_SUFFIX(); 517 if (*fnp) 518 strlcpy(old_filename, fnp, PATH_MAX); 519 printf("%s\n", strip_escapes(old_filename)); 520 break; 521 case 'g': 522 case 'v': 523 case 'G': 524 case 'V': 525 if (isglobal) { 526 errmsg = "cannot nest global commands"; 527 return ERR; 528 } else if (check_addr_range(1, addr_last) < 0) 529 return ERR; 530 else if (build_active_list(c == 'g' || c == 'G') < 0) 531 return ERR; 532 else if ((n = (c == 'G' || c == 'V'))) 533 GET_COMMAND_SUFFIX(); 534 isglobal++; 535 if (exec_global(n, gflag) < 0) 536 return ERR; 537 break; 538 case 'h': 539 if (addr_cnt > 0) { 540 errmsg = "unexpected address"; 541 return ERR; 542 } 543 GET_COMMAND_SUFFIX(); 544 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 545 break; 546 case 'H': 547 if (addr_cnt > 0) { 548 errmsg = "unexpected address"; 549 return ERR; 550 } 551 GET_COMMAND_SUFFIX(); 552 if ((garrulous = 1 - garrulous) && *errmsg) 553 fprintf(stderr, "%s\n", errmsg); 554 break; 555 case 'i': 556 if (second_addr == 0) { 557 errmsg = "invalid address"; 558 return ERR; 559 } 560 GET_COMMAND_SUFFIX(); 561 if (!isglobal) clear_undo_stack(); 562 if (append_lines(second_addr - 1) < 0) 563 return ERR; 564 break; 565 case 'j': 566 if (check_addr_range(current_addr, current_addr + 1) < 0) 567 return ERR; 568 GET_COMMAND_SUFFIX(); 569 if (!isglobal) clear_undo_stack(); 570 if (first_addr != second_addr && 571 join_lines(first_addr, second_addr) < 0) 572 return ERR; 573 break; 574 case 'k': 575 c = *ibufp++; 576 if (second_addr == 0) { 577 errmsg = "invalid address"; 578 return ERR; 579 } 580 GET_COMMAND_SUFFIX(); 581 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 582 return ERR; 583 break; 584 case 'l': 585 if (check_addr_range(current_addr, current_addr) < 0) 586 return ERR; 587 GET_COMMAND_SUFFIX(); 588 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 589 return ERR; 590 gflag = 0; 591 break; 592 case 'm': 593 if (check_addr_range(current_addr, current_addr) < 0) 594 return ERR; 595 GET_THIRD_ADDR(addr); 596 if (first_addr <= addr && addr < second_addr) { 597 errmsg = "invalid destination"; 598 return ERR; 599 } 600 GET_COMMAND_SUFFIX(); 601 if (!isglobal) clear_undo_stack(); 602 if (move_lines(addr) < 0) 603 return ERR; 604 break; 605 case 'n': 606 if (check_addr_range(current_addr, current_addr) < 0) 607 return ERR; 608 GET_COMMAND_SUFFIX(); 609 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 610 return ERR; 611 gflag = 0; 612 break; 613 case 'p': 614 if (check_addr_range(current_addr, current_addr) < 0) 615 return ERR; 616 GET_COMMAND_SUFFIX(); 617 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 618 return ERR; 619 gflag = 0; 620 break; 621 case 'P': 622 if (addr_cnt > 0) { 623 errmsg = "unexpected address"; 624 return ERR; 625 } 626 GET_COMMAND_SUFFIX(); 627 prompt = prompt ? NULL : optarg ? optarg : dps; 628 break; 629 case 'q': 630 case 'Q': 631 if (addr_cnt > 0) { 632 errmsg = "unexpected address"; 633 return ERR; 634 } 635 GET_COMMAND_SUFFIX(); 636 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 637 break; 638 case 'r': 639 if (!isspace((unsigned char)*ibufp)) { 640 errmsg = "unexpected command suffix"; 641 return ERR; 642 } else if (addr_cnt == 0) 643 second_addr = addr_last; 644 if ((fnp = get_filename()) == NULL) 645 return ERR; 646 GET_COMMAND_SUFFIX(); 647 if (!isglobal) clear_undo_stack(); 648 if (*old_filename == '\0' && *fnp != '!') 649 strlcpy(old_filename, fnp, PATH_MAX); 650 #ifdef BACKWARDS 651 if (*fnp == '\0' && *old_filename == '\0') { 652 errmsg = "no current filename"; 653 return ERR; 654 } 655 #endif 656 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 657 return ERR; 658 else if (addr && addr != addr_last) 659 modified = 1; 660 break; 661 case 's': 662 do { 663 switch(*ibufp) { 664 case '\n': 665 sflags |=SGF; 666 break; 667 case 'g': 668 sflags |= SGG; 669 ibufp++; 670 break; 671 case 'p': 672 sflags |= SGP; 673 ibufp++; 674 break; 675 case 'r': 676 sflags |= SGR; 677 ibufp++; 678 break; 679 case '0': case '1': case '2': case '3': case '4': 680 case '5': case '6': case '7': case '8': case '9': 681 STRTOL(sgnum, ibufp); 682 sflags |= SGF; 683 sgflag &= ~GSG; /* override GSG */ 684 break; 685 default: 686 if (sflags) { 687 errmsg = "invalid command suffix"; 688 return ERR; 689 } 690 } 691 } while (sflags && *ibufp != '\n'); 692 if (sflags && !pat) { 693 errmsg = "no previous substitution"; 694 return ERR; 695 } else if (sflags & SGG) 696 sgnum = 0; /* override numeric arg */ 697 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 698 errmsg = "invalid pattern delimiter"; 699 return ERR; 700 } 701 tpat = pat; 702 SPL1(); 703 if ((!sflags || (sflags & SGR)) && 704 (tpat = get_compiled_pattern()) == NULL) { 705 SPL0(); 706 return ERR; 707 } else if (tpat != pat) { 708 if (pat) { 709 regfree(pat); 710 free(pat); 711 } 712 pat = tpat; 713 patlock = 1; /* reserve pattern */ 714 } 715 SPL0(); 716 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 717 return ERR; 718 else if (isglobal) 719 sgflag |= GLB; 720 else 721 sgflag &= ~GLB; 722 if (sflags & SGG) 723 sgflag ^= GSG; 724 if (sflags & SGP) 725 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 726 do { 727 switch(*ibufp) { 728 case 'p': 729 sgflag |= GPR, ibufp++; 730 break; 731 case 'l': 732 sgflag |= GLS, ibufp++; 733 break; 734 case 'n': 735 sgflag |= GNP, ibufp++; 736 break; 737 default: 738 n++; 739 } 740 } while (!n); 741 if (check_addr_range(current_addr, current_addr) < 0) 742 return ERR; 743 GET_COMMAND_SUFFIX(); 744 if (!isglobal) clear_undo_stack(); 745 if (search_and_replace(pat, sgflag, sgnum) < 0) 746 return ERR; 747 break; 748 case 't': 749 if (check_addr_range(current_addr, current_addr) < 0) 750 return ERR; 751 GET_THIRD_ADDR(addr); 752 GET_COMMAND_SUFFIX(); 753 if (!isglobal) clear_undo_stack(); 754 if (copy_lines(addr) < 0) 755 return ERR; 756 break; 757 case 'u': 758 if (addr_cnt > 0) { 759 errmsg = "unexpected address"; 760 return ERR; 761 } 762 GET_COMMAND_SUFFIX(); 763 if (pop_undo_stack() < 0) 764 return ERR; 765 break; 766 case 'w': 767 case 'W': 768 if ((n = *ibufp) == 'q' || n == 'Q') { 769 gflag = EOF; 770 ibufp++; 771 } 772 if (!isspace((unsigned char)*ibufp)) { 773 errmsg = "unexpected command suffix"; 774 return ERR; 775 } else if ((fnp = get_filename()) == NULL) 776 return ERR; 777 if (addr_cnt == 0 && !addr_last) 778 first_addr = second_addr = 0; 779 else if (check_addr_range(1, addr_last) < 0) 780 return ERR; 781 GET_COMMAND_SUFFIX(); 782 if (*old_filename == '\0' && *fnp != '!') 783 strlcpy(old_filename, fnp, PATH_MAX); 784 #ifdef BACKWARDS 785 if (*fnp == '\0' && *old_filename == '\0') { 786 errmsg = "no current filename"; 787 return ERR; 788 } 789 #endif 790 if ((addr = write_file(*fnp ? fnp : old_filename, 791 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 792 return ERR; 793 else if (addr == addr_last && *fnp != '!') 794 modified = 0; 795 else if (modified && !scripted && n == 'q') 796 gflag = EMOD; 797 break; 798 case 'x': 799 if (addr_cnt > 0) { 800 errmsg = "unexpected address"; 801 return ERR; 802 } 803 GET_COMMAND_SUFFIX(); 804 errmsg = "crypt unavailable"; 805 return ERR; 806 case 'z': 807 #ifdef BACKWARDS 808 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 809 #else 810 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 811 #endif 812 return ERR; 813 else if ('0' < *ibufp && *ibufp <= '9') 814 STRTOL(rows, ibufp); 815 GET_COMMAND_SUFFIX(); 816 if (display_lines(second_addr, min(addr_last, 817 second_addr + rows), gflag) < 0) 818 return ERR; 819 gflag = 0; 820 break; 821 case '=': 822 GET_COMMAND_SUFFIX(); 823 printf("%ld\n", addr_cnt ? second_addr : addr_last); 824 break; 825 case '!': 826 if (addr_cnt > 0) { 827 errmsg = "unexpected address"; 828 return ERR; 829 } else if ((sflags = get_shell_command()) < 0) 830 return ERR; 831 GET_COMMAND_SUFFIX(); 832 if (sflags) printf("%s\n", shcmd + 1); 833 system(shcmd + 1); 834 if (!scripted) printf("!\n"); 835 break; 836 case '\n': 837 #ifdef BACKWARDS 838 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 839 #else 840 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 841 #endif 842 || display_lines(second_addr, second_addr, 0) < 0) 843 return ERR; 844 break; 845 default: 846 errmsg = "unknown command"; 847 return ERR; 848 } 849 return gflag; 850 } 851 852 853 /* check_addr_range: return status of address range check */ 854 int 855 check_addr_range(long n, long m) 856 { 857 if (addr_cnt == 0) { 858 first_addr = n; 859 second_addr = m; 860 } 861 if (first_addr > second_addr || 1 > first_addr || 862 second_addr > addr_last) { 863 errmsg = "invalid address"; 864 return ERR; 865 } 866 return 0; 867 } 868 869 870 /* get_matching_node_addr: return the address of the next line matching a 871 pattern in a given direction. wrap around begin/end of editor buffer if 872 necessary */ 873 long 874 get_matching_node_addr(pattern_t *pat, int dir) 875 { 876 char *s; 877 long n = current_addr; 878 line_t *lp; 879 880 if (!pat) return ERR; 881 do { 882 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { 883 lp = get_addressed_line_node(n); 884 if ((s = get_sbuf_line(lp)) == NULL) 885 return ERR; 886 if (isbinary) 887 NUL_TO_NEWLINE(s, lp->len); 888 if (!regexec(pat, s, 0, NULL, 0)) 889 return n; 890 } 891 } while (n != current_addr); 892 errmsg = "no match"; 893 return ERR; 894 } 895 896 897 /* get_filename: return pointer to copy of filename in the command buffer */ 898 char * 899 get_filename(void) 900 { 901 static char *file = NULL; 902 static int filesz = 0; 903 904 int n; 905 906 if (*ibufp != '\n') { 907 SKIP_BLANKS(); 908 if (*ibufp == '\n') { 909 errmsg = "invalid filename"; 910 return NULL; 911 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 912 return NULL; 913 else if (*ibufp == '!') { 914 ibufp++; 915 if ((n = get_shell_command()) < 0) 916 return NULL; 917 if (n) 918 printf("%s\n", shcmd + 1); 919 return shcmd; 920 } else if (n > PATH_MAX - 1) { 921 errmsg = "filename too long"; 922 return NULL; 923 } 924 } 925 #ifndef BACKWARDS 926 else if (*old_filename == '\0') { 927 errmsg = "no current filename"; 928 return NULL; 929 } 930 #endif 931 REALLOC(file, filesz, PATH_MAX, NULL); 932 for (n = 0; *ibufp != '\n';) 933 file[n++] = *ibufp++; 934 file[n] = '\0'; 935 return is_legal_filename(file) ? file : NULL; 936 } 937 938 939 /* get_shell_command: read a shell command from stdin; return substitution 940 status */ 941 int 942 get_shell_command(void) 943 { 944 static char *buf = NULL; 945 static int n = 0; 946 947 char *s; /* substitution char pointer */ 948 int i = 0; 949 int j = 0; 950 951 if (red) { 952 errmsg = "shell access restricted"; 953 return ERR; 954 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 955 return ERR; 956 REALLOC(buf, n, j + 1, ERR); 957 buf[i++] = '!'; /* prefix command w/ bang */ 958 while (*ibufp != '\n') 959 switch (*ibufp) { 960 default: 961 REALLOC(buf, n, i + 2, ERR); 962 buf[i++] = *ibufp; 963 if (*ibufp++ == '\\') 964 buf[i++] = *ibufp++; 965 break; 966 case '!': 967 if (s != ibufp) { 968 REALLOC(buf, n, i + 1, ERR); 969 buf[i++] = *ibufp++; 970 } 971 #ifdef BACKWARDS 972 else if (shcmd == NULL || *(shcmd + 1) == '\0') 973 #else 974 else if (shcmd == NULL) 975 #endif 976 { 977 errmsg = "no previous command"; 978 return ERR; 979 } else { 980 REALLOC(buf, n, i + shcmdi, ERR); 981 for (s = shcmd + 1; s < shcmd + shcmdi;) 982 buf[i++] = *s++; 983 s = ibufp++; 984 } 985 break; 986 case '%': 987 if (*old_filename == '\0') { 988 errmsg = "no current filename"; 989 return ERR; 990 } 991 j = strlen(s = strip_escapes(old_filename)); 992 REALLOC(buf, n, i + j, ERR); 993 while (j--) 994 buf[i++] = *s++; 995 s = ibufp++; 996 break; 997 } 998 REALLOC(shcmd, shcmdsz, i + 1, ERR); 999 memcpy(shcmd, buf, i); 1000 shcmd[shcmdi = i] = '\0'; 1001 return *s == '!' || *s == '%'; 1002 } 1003 1004 1005 /* append_lines: insert text from stdin to after line n; stop when either a 1006 single period is read or EOF; return status */ 1007 int 1008 append_lines(long n) 1009 { 1010 int l; 1011 const char *lp = ibuf; 1012 const char *eot; 1013 undo_t *up = NULL; 1014 1015 for (current_addr = n;;) { 1016 if (!isglobal) { 1017 if ((l = get_tty_line()) < 0) 1018 return ERR; 1019 else if (l == 0 || ibuf[l - 1] != '\n') { 1020 clearerr(stdin); 1021 return l ? EOF : 0; 1022 } 1023 lp = ibuf; 1024 } else if (*(lp = ibufp) == '\0') 1025 return 0; 1026 else { 1027 while (*ibufp++ != '\n') 1028 ; 1029 l = ibufp - lp; 1030 } 1031 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1032 return 0; 1033 } 1034 eot = lp + l; 1035 SPL1(); 1036 do { 1037 if ((lp = put_sbuf_line(lp)) == NULL) { 1038 SPL0(); 1039 return ERR; 1040 } else if (up) 1041 up->t = get_addressed_line_node(current_addr); 1042 else if ((up = push_undo_stack(UADD, current_addr, 1043 current_addr)) == NULL) { 1044 SPL0(); 1045 return ERR; 1046 } 1047 } while (lp != eot); 1048 modified = 1; 1049 SPL0(); 1050 } 1051 /* NOTREACHED */ 1052 } 1053 1054 1055 /* join_lines: replace a range of lines with the joined text of those lines */ 1056 int 1057 join_lines(long from, long to) 1058 { 1059 static char *buf = NULL; 1060 static int n; 1061 1062 char *s; 1063 int size = 0; 1064 line_t *bp, *ep; 1065 1066 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1067 bp = get_addressed_line_node(from); 1068 for (; bp != ep; bp = bp->q_forw) { 1069 if ((s = get_sbuf_line(bp)) == NULL) 1070 return ERR; 1071 REALLOC(buf, n, size + bp->len, ERR); 1072 memcpy(buf + size, s, bp->len); 1073 size += bp->len; 1074 } 1075 REALLOC(buf, n, size + 2, ERR); 1076 memcpy(buf + size, "\n", 2); 1077 if (delete_lines(from, to) < 0) 1078 return ERR; 1079 current_addr = from - 1; 1080 SPL1(); 1081 if (put_sbuf_line(buf) == NULL || 1082 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1083 SPL0(); 1084 return ERR; 1085 } 1086 modified = 1; 1087 SPL0(); 1088 return 0; 1089 } 1090 1091 1092 /* move_lines: move a range of lines */ 1093 int 1094 move_lines(long addr) 1095 { 1096 line_t *b1, *a1, *b2, *a2; 1097 long n = INC_MOD(second_addr, addr_last); 1098 long p = first_addr - 1; 1099 int done = (addr == first_addr - 1 || addr == second_addr); 1100 1101 SPL1(); 1102 if (done) { 1103 a2 = get_addressed_line_node(n); 1104 b2 = get_addressed_line_node(p); 1105 current_addr = second_addr; 1106 } else if (push_undo_stack(UMOV, p, n) == NULL || 1107 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1108 SPL0(); 1109 return ERR; 1110 } else { 1111 a1 = get_addressed_line_node(n); 1112 if (addr < first_addr) { 1113 b1 = get_addressed_line_node(p); 1114 b2 = get_addressed_line_node(addr); 1115 /* this get_addressed_line_node last! */ 1116 } else { 1117 b2 = get_addressed_line_node(addr); 1118 b1 = get_addressed_line_node(p); 1119 /* this get_addressed_line_node last! */ 1120 } 1121 a2 = b2->q_forw; 1122 REQUE(b2, b1->q_forw); 1123 REQUE(a1->q_back, a2); 1124 REQUE(b1, a1); 1125 current_addr = addr + ((addr < first_addr) ? 1126 second_addr - first_addr + 1 : 0); 1127 } 1128 if (isglobal) 1129 unset_active_nodes(b2->q_forw, a2); 1130 modified = 1; 1131 SPL0(); 1132 return 0; 1133 } 1134 1135 1136 /* copy_lines: copy a range of lines; return status */ 1137 int 1138 copy_lines(long addr) 1139 { 1140 line_t *lp, *np = get_addressed_line_node(first_addr); 1141 undo_t *up = NULL; 1142 long n = second_addr - first_addr + 1; 1143 long m = 0; 1144 1145 current_addr = addr; 1146 if (first_addr <= addr && addr < second_addr) { 1147 n = addr - first_addr + 1; 1148 m = second_addr - addr; 1149 } 1150 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1151 for (; n-- > 0; np = np->q_forw) { 1152 SPL1(); 1153 if ((lp = dup_line_node(np)) == NULL) { 1154 SPL0(); 1155 return ERR; 1156 } 1157 add_line_node(lp); 1158 if (up) 1159 up->t = lp; 1160 else if ((up = push_undo_stack(UADD, current_addr, 1161 current_addr)) == NULL) { 1162 SPL0(); 1163 return ERR; 1164 } 1165 modified = 1; 1166 SPL0(); 1167 } 1168 return 0; 1169 } 1170 1171 1172 /* delete_lines: delete a range of lines */ 1173 int 1174 delete_lines(long from, long to) 1175 { 1176 line_t *n, *p; 1177 1178 SPL1(); 1179 if (push_undo_stack(UDEL, from, to) == NULL) { 1180 SPL0(); 1181 return ERR; 1182 } 1183 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1184 p = get_addressed_line_node(from - 1); 1185 /* this get_addressed_line_node last! */ 1186 if (isglobal) 1187 unset_active_nodes(p->q_forw, n); 1188 REQUE(p, n); 1189 addr_last -= to - from + 1; 1190 current_addr = from - 1; 1191 modified = 1; 1192 SPL0(); 1193 return 0; 1194 } 1195 1196 1197 /* display_lines: print a range of lines to stdout */ 1198 int 1199 display_lines(long from, long to, int gflag) 1200 { 1201 line_t *bp; 1202 line_t *ep; 1203 char *s; 1204 1205 if (!from) { 1206 errmsg = "invalid address"; 1207 return ERR; 1208 } 1209 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1210 bp = get_addressed_line_node(from); 1211 for (; bp != ep; bp = bp->q_forw) { 1212 if ((s = get_sbuf_line(bp)) == NULL) 1213 return ERR; 1214 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1215 return ERR; 1216 } 1217 return 0; 1218 } 1219 1220 1221 #define MAXMARK 26 /* max number of marks */ 1222 1223 static line_t *mark[MAXMARK]; /* line markers */ 1224 static int markno; /* line marker count */ 1225 1226 /* mark_line_node: set a line node mark */ 1227 int 1228 mark_line_node(line_t *lp, int n) 1229 { 1230 if (!islower((unsigned char)n)) { 1231 errmsg = "invalid mark character"; 1232 return ERR; 1233 } else if (mark[n - 'a'] == NULL) 1234 markno++; 1235 mark[n - 'a'] = lp; 1236 return 0; 1237 } 1238 1239 1240 /* get_marked_node_addr: return address of a marked line */ 1241 long 1242 get_marked_node_addr(int n) 1243 { 1244 if (!islower((unsigned char)n)) { 1245 errmsg = "invalid mark character"; 1246 return ERR; 1247 } 1248 return get_line_node_addr(mark[n - 'a']); 1249 } 1250 1251 1252 /* unmark_line_node: clear line node mark */ 1253 void 1254 unmark_line_node(line_t *lp) 1255 { 1256 int i; 1257 1258 for (i = 0; markno && i < MAXMARK; i++) 1259 if (mark[i] == lp) { 1260 mark[i] = NULL; 1261 markno--; 1262 } 1263 } 1264 1265 1266 /* dup_line_node: return a pointer to a copy of a line node */ 1267 line_t * 1268 dup_line_node(line_t *lp) 1269 { 1270 line_t *np; 1271 1272 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1273 fprintf(stderr, "%s\n", strerror(errno)); 1274 errmsg = "out of memory"; 1275 return NULL; 1276 } 1277 np->seek = lp->seek; 1278 np->len = lp->len; 1279 return np; 1280 } 1281 1282 1283 /* has_trailing_escape: return the parity of escapes preceding a character 1284 in a string */ 1285 int 1286 has_trailing_escape(char *s, char *t) 1287 { 1288 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1289 } 1290 1291 1292 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */ 1293 char * 1294 strip_escapes(char *s) 1295 { 1296 static char *file = NULL; 1297 static int filesz = 0; 1298 1299 int i = 0; 1300 1301 REALLOC(file, filesz, PATH_MAX, NULL); 1302 while (i < filesz - 1 /* Worry about a possible trailing escape */ 1303 && (file[i++] = (*s == '\\') ? *++s : *s)) 1304 s++; 1305 return file; 1306 } 1307 1308 1309 void 1310 signal_hup(int signo) 1311 { 1312 if (mutex) 1313 sigflags |= (1 << (signo - 1)); 1314 else 1315 handle_hup(signo); 1316 } 1317 1318 1319 void 1320 signal_int(int signo) 1321 { 1322 if (mutex) 1323 sigflags |= (1 << (signo - 1)); 1324 else 1325 handle_int(signo); 1326 } 1327 1328 1329 void 1330 handle_hup(int signo) 1331 { 1332 char *hup = NULL; /* hup filename */ 1333 char *s; 1334 char ed_hup[] = "ed.hup"; 1335 size_t n; 1336 1337 if (!sigactive) 1338 quit(1); 1339 sigflags &= ~(1 << (signo - 1)); 1340 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 && 1341 (s = getenv("HOME")) != NULL && 1342 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */ 1343 (hup = (char *) malloc(n + 10)) != NULL) { 1344 strcpy(hup, s); 1345 if (hup[n - 1] != '/') 1346 hup[n] = '/', hup[n+1] = '\0'; 1347 strcat(hup, "ed.hup"); 1348 write_file(hup, "w", 1, addr_last); 1349 } 1350 quit(2); 1351 } 1352 1353 1354 void 1355 handle_int(int signo) 1356 { 1357 if (!sigactive) 1358 quit(1); 1359 sigflags &= ~(1 << (signo - 1)); 1360 #ifdef _POSIX_SOURCE 1361 siglongjmp(env, -1); 1362 #else 1363 longjmp(env, -1); 1364 #endif 1365 } 1366 1367 1368 int cols = 72; /* wrap column */ 1369 1370 void 1371 handle_winch(int signo) 1372 { 1373 int save_errno = errno; 1374 1375 struct winsize ws; /* window size structure */ 1376 1377 sigflags &= ~(1 << (signo - 1)); 1378 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1379 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1380 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1381 } 1382 errno = save_errno; 1383 } 1384 1385 1386 /* is_legal_filename: return a legal filename */ 1387 int 1388 is_legal_filename(char *s) 1389 { 1390 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1391 errmsg = "shell access restricted"; 1392 return 0; 1393 } 1394 return 1; 1395 } 1396