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 #ifndef lint 30 #if 0 31 static const char copyright[] = 32 "@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\ 33 All rights reserved.\n"; 34 #endif 35 #endif /* not lint */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 /* 41 * CREDITS 42 * 43 * This program is based on the editor algorithm described in 44 * Brian W. Kernighan and P. J. Plauger's book "Software Tools 45 * in Pascal," Addison-Wesley, 1981. 46 * 47 * The buffering algorithm is attributed to Rodney Ruddock of 48 * the University of Guelph, Guelph, Ontario. 49 * 50 * The cbc.c encryption code is adapted from 51 * the bdes program by Matt Bishop of Dartmouth College, 52 * Hanover, NH. 53 * 54 */ 55 56 #include <sys/types.h> 57 58 #include <sys/ioctl.h> 59 #include <sys/wait.h> 60 #include <ctype.h> 61 #include <locale.h> 62 #include <pwd.h> 63 #include <setjmp.h> 64 65 #include "ed.h" 66 67 68 #ifdef _POSIX_SOURCE 69 sigjmp_buf env; 70 #else 71 jmp_buf env; 72 #endif 73 74 /* static buffers */ 75 char stdinbuf[1]; /* stdin buffer */ 76 char *shcmd; /* shell command buffer */ 77 int shcmdsz; /* shell command buffer size */ 78 int shcmdi; /* shell command buffer index */ 79 char *ibuf; /* ed command-line buffer */ 80 int ibufsz; /* ed command-line buffer size */ 81 char *ibufp; /* pointer to ed command-line buffer */ 82 83 /* global flags */ 84 int des = 0; /* if set, use crypt(3) for i/o */ 85 int garrulous = 0; /* if set, print all error messages */ 86 int isbinary; /* if set, buffer contains ASCII NULs */ 87 int isglobal; /* if set, doing a global command */ 88 int modified; /* if set, buffer modified since last write */ 89 int mutex = 0; /* if set, signals set "sigflags" */ 90 int red = 0; /* if set, restrict shell/directory access */ 91 int scripted = 0; /* if set, suppress diagnostics */ 92 int sigflags = 0; /* if set, signals received while mutex set */ 93 int sigactive = 0; /* if set, signal handlers are enabled */ 94 95 char old_filename[PATH_MAX] = ""; /* default filename */ 96 long current_addr; /* current address in editor buffer */ 97 long addr_last; /* last address in editor buffer */ 98 int lineno; /* script line number */ 99 const char *prompt; /* command-line prompt */ 100 const char *dps = "*"; /* default command-line prompt */ 101 102 const char usage[] = "usage: %s [-] [-sx] [-p string] [file]\n"; 103 104 /* ed: line editor */ 105 int 106 main(volatile int argc, char ** volatile argv) 107 { 108 int c, n; 109 long status = 0; 110 111 (void)setlocale(LC_ALL, ""); 112 113 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 114 top: 115 while ((c = getopt(argc, argv, "p:sx")) != -1) 116 switch(c) { 117 case 'p': /* set prompt */ 118 prompt = optarg; 119 break; 120 case 's': /* run script */ 121 scripted = 1; 122 break; 123 case 'x': /* use crypt */ 124 #ifdef DES 125 des = get_keyword(); 126 #else 127 fprintf(stderr, "crypt unavailable\n?\n"); 128 #endif 129 break; 130 131 default: 132 fprintf(stderr, usage, red ? "red" : "ed"); 133 exit(1); 134 } 135 argv += optind; 136 argc -= optind; 137 if (argc && **argv == '-') { 138 scripted = 1; 139 if (argc > 1) { 140 optind = 1; 141 goto top; 142 } 143 argv++; 144 argc--; 145 } 146 /* assert: reliable signals! */ 147 #ifdef SIGWINCH 148 handle_winch(SIGWINCH); 149 if (isatty(0)) signal(SIGWINCH, handle_winch); 150 #endif 151 signal(SIGHUP, signal_hup); 152 signal(SIGQUIT, SIG_IGN); 153 signal(SIGINT, signal_int); 154 #ifdef _POSIX_SOURCE 155 if ((status = sigsetjmp(env, 1))) 156 #else 157 if ((status = setjmp(env))) 158 #endif 159 { 160 fputs("\n?\n", stderr); 161 errmsg = "interrupt"; 162 } else { 163 init_buffers(); 164 sigactive = 1; /* enable signal handlers */ 165 if (argc && **argv && is_legal_filename(*argv)) { 166 if (read_file(*argv, 0) < 0 && !isatty(0)) 167 quit(2); 168 else if (**argv != '!') 169 if (strlcpy(old_filename, *argv, sizeof(old_filename)) 170 >= sizeof(old_filename)) 171 quit(2); 172 } else if (argc) { 173 fputs("?\n", stderr); 174 if (**argv == '\0') 175 errmsg = "invalid filename"; 176 if (!isatty(0)) 177 quit(2); 178 } 179 } 180 for (;;) { 181 if (status < 0 && garrulous) 182 fprintf(stderr, "%s\n", errmsg); 183 if (prompt) { 184 printf("%s", prompt); 185 fflush(stdout); 186 } 187 if ((n = get_tty_line()) < 0) { 188 status = ERR; 189 continue; 190 } else if (n == 0) { 191 if (modified && !scripted) { 192 fputs("?\n", stderr); 193 errmsg = "warning: file modified"; 194 if (!isatty(0)) { 195 if (garrulous) 196 fprintf(stderr, 197 "script, line %d: %s\n", 198 lineno, errmsg); 199 quit(2); 200 } 201 clearerr(stdin); 202 modified = 0; 203 status = EMOD; 204 continue; 205 } else 206 quit(0); 207 } else if (ibuf[n - 1] != '\n') { 208 /* discard line */ 209 errmsg = "unexpected end-of-file"; 210 clearerr(stdin); 211 status = ERR; 212 continue; 213 } 214 isglobal = 0; 215 if ((status = extract_addr_range()) >= 0 && 216 (status = exec_command()) >= 0) 217 if (!status || 218 (status = display_lines(current_addr, current_addr, 219 status)) >= 0) 220 continue; 221 switch (status) { 222 case EOF: 223 quit(0); 224 case EMOD: 225 modified = 0; 226 fputs("?\n", stderr); /* give warning */ 227 errmsg = "warning: file modified"; 228 if (!isatty(0)) { 229 if (garrulous) 230 fprintf(stderr, "script, line %d: %s\n", 231 lineno, errmsg); 232 quit(2); 233 } 234 break; 235 case FATAL: 236 if (!isatty(0)) { 237 if (garrulous) 238 fprintf(stderr, "script, line %d: %s\n", 239 lineno, errmsg); 240 } else if (garrulous) 241 fprintf(stderr, "%s\n", errmsg); 242 quit(3); 243 default: 244 fputs("?\n", stderr); 245 if (!isatty(0)) { 246 if (garrulous) 247 fprintf(stderr, "script, line %d: %s\n", 248 lineno, errmsg); 249 quit(2); 250 } 251 break; 252 } 253 } 254 /*NOTREACHED*/ 255 } 256 257 long first_addr, second_addr, addr_cnt; 258 259 /* extract_addr_range: get line addresses from the command buffer until an 260 illegal address is seen; return status */ 261 int 262 extract_addr_range(void) 263 { 264 long addr; 265 266 addr_cnt = 0; 267 first_addr = second_addr = current_addr; 268 while ((addr = next_addr()) >= 0) { 269 addr_cnt++; 270 first_addr = second_addr; 271 second_addr = addr; 272 if (*ibufp != ',' && *ibufp != ';') 273 break; 274 else if (*ibufp++ == ';') 275 current_addr = addr; 276 } 277 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 278 first_addr = second_addr; 279 return (addr == ERR) ? ERR : 0; 280 } 281 282 283 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++ 284 285 #define MUST_BE_FIRST() do { \ 286 if (!first) { \ 287 errmsg = "invalid address"; \ 288 return ERR; \ 289 } \ 290 } while (0) 291 292 /* next_addr: return the next line address in the command buffer */ 293 long 294 next_addr(void) 295 { 296 const char *hd; 297 long addr = current_addr; 298 long n; 299 int first = 1; 300 int c; 301 302 SKIP_BLANKS(); 303 for (hd = ibufp;; first = 0) 304 switch (c = *ibufp) { 305 case '+': 306 case '\t': 307 case ' ': 308 case '-': 309 case '^': 310 ibufp++; 311 SKIP_BLANKS(); 312 if (isdigit((unsigned char)*ibufp)) { 313 STRTOL(n, ibufp); 314 addr += (c == '-' || c == '^') ? -n : n; 315 } else if (!isspace((unsigned char)c)) 316 addr += (c == '-' || c == '^') ? -1 : 1; 317 break; 318 case '0': case '1': case '2': 319 case '3': case '4': case '5': 320 case '6': case '7': case '8': case '9': 321 MUST_BE_FIRST(); 322 STRTOL(addr, ibufp); 323 break; 324 case '.': 325 case '$': 326 MUST_BE_FIRST(); 327 ibufp++; 328 addr = (c == '.') ? current_addr : addr_last; 329 break; 330 case '/': 331 case '?': 332 MUST_BE_FIRST(); 333 if ((addr = get_matching_node_addr( 334 get_compiled_pattern(), c == '/')) < 0) 335 return ERR; 336 else if (c == *ibufp) 337 ibufp++; 338 break; 339 case '\'': 340 MUST_BE_FIRST(); 341 ibufp++; 342 if ((addr = get_marked_node_addr(*ibufp++)) < 0) 343 return ERR; 344 break; 345 case '%': 346 case ',': 347 case ';': 348 if (first) { 349 ibufp++; 350 addr_cnt++; 351 second_addr = (c == ';') ? current_addr : 1; 352 addr = addr_last; 353 break; 354 } 355 /* FALLTHROUGH */ 356 default: 357 if (ibufp == hd) 358 return EOF; 359 else if (addr < 0 || addr_last < addr) { 360 errmsg = "invalid address"; 361 return ERR; 362 } else 363 return addr; 364 } 365 /* NOTREACHED */ 366 } 367 368 369 #ifdef BACKWARDS 370 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 371 #define GET_THIRD_ADDR(addr) \ 372 { \ 373 long ol1, ol2; \ 374 \ 375 ol1 = first_addr, ol2 = second_addr; \ 376 if (extract_addr_range() < 0) \ 377 return ERR; \ 378 else if (addr_cnt == 0) { \ 379 errmsg = "destination expected"; \ 380 return ERR; \ 381 } else if (second_addr < 0 || addr_last < second_addr) { \ 382 errmsg = "invalid address"; \ 383 return ERR; \ 384 } \ 385 addr = second_addr; \ 386 first_addr = ol1, second_addr = ol2; \ 387 } 388 #else /* BACKWARDS */ 389 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 390 #define GET_THIRD_ADDR(addr) \ 391 { \ 392 long ol1, ol2; \ 393 \ 394 ol1 = first_addr, ol2 = second_addr; \ 395 if (extract_addr_range() < 0) \ 396 return ERR; \ 397 if (second_addr < 0 || addr_last < second_addr) { \ 398 errmsg = "invalid address"; \ 399 return ERR; \ 400 } \ 401 addr = second_addr; \ 402 first_addr = ol1, second_addr = ol2; \ 403 } 404 #endif 405 406 407 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 408 #define GET_COMMAND_SUFFIX() { \ 409 int done = 0; \ 410 do { \ 411 switch(*ibufp) { \ 412 case 'p': \ 413 gflag |= GPR, ibufp++; \ 414 break; \ 415 case 'l': \ 416 gflag |= GLS, ibufp++; \ 417 break; \ 418 case 'n': \ 419 gflag |= GNP, ibufp++; \ 420 break; \ 421 default: \ 422 done++; \ 423 } \ 424 } while (!done); \ 425 if (*ibufp++ != '\n') { \ 426 errmsg = "invalid command suffix"; \ 427 return ERR; \ 428 } \ 429 } 430 431 432 /* sflags */ 433 #define SGG 001 /* complement previous global substitute suffix */ 434 #define SGP 002 /* complement previous print suffix */ 435 #define SGR 004 /* use last regex instead of last pat */ 436 #define SGF 010 /* repeat last substitution */ 437 438 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 439 440 long rows = 22; /* scroll length: ws_row - 2 */ 441 442 /* exec_command: execute the next command in command buffer; return print 443 request, if any */ 444 int 445 exec_command(void) 446 { 447 static pattern_t *pat = NULL; 448 static int sgflag = 0; 449 static long sgnum = 0; 450 451 pattern_t *tpat; 452 char *fnp; 453 int gflag = 0; 454 int sflags = 0; 455 long addr = 0; 456 int n = 0; 457 int c; 458 459 SKIP_BLANKS(); 460 switch(c = *ibufp++) { 461 case 'a': 462 GET_COMMAND_SUFFIX(); 463 if (!isglobal) clear_undo_stack(); 464 if (append_lines(second_addr) < 0) 465 return ERR; 466 break; 467 case 'c': 468 if (check_addr_range(current_addr, current_addr) < 0) 469 return ERR; 470 GET_COMMAND_SUFFIX(); 471 if (!isglobal) clear_undo_stack(); 472 if (delete_lines(first_addr, second_addr) < 0 || 473 append_lines(current_addr) < 0) 474 return ERR; 475 break; 476 case 'd': 477 if (check_addr_range(current_addr, current_addr) < 0) 478 return ERR; 479 GET_COMMAND_SUFFIX(); 480 if (!isglobal) clear_undo_stack(); 481 if (delete_lines(first_addr, second_addr) < 0) 482 return ERR; 483 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 484 current_addr = addr; 485 break; 486 case 'e': 487 if (modified && !scripted) 488 return EMOD; 489 /* FALLTHROUGH */ 490 case 'E': 491 if (addr_cnt > 0) { 492 errmsg = "unexpected address"; 493 return ERR; 494 } else if (!isspace((unsigned char)*ibufp)) { 495 errmsg = "unexpected command suffix"; 496 return ERR; 497 } else if ((fnp = get_filename()) == NULL) 498 return ERR; 499 GET_COMMAND_SUFFIX(); 500 if (delete_lines(1, addr_last) < 0) 501 return ERR; 502 clear_undo_stack(); 503 if (close_sbuf() < 0) 504 return ERR; 505 else if (open_sbuf() < 0) 506 return FATAL; 507 if (*fnp && *fnp != '!') strcpy(old_filename, fnp); 508 #ifdef BACKWARDS 509 if (*fnp == '\0' && *old_filename == '\0') { 510 errmsg = "no current filename"; 511 return ERR; 512 } 513 #endif 514 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 515 return ERR; 516 clear_undo_stack(); 517 modified = 0; 518 u_current_addr = u_addr_last = -1; 519 break; 520 case 'f': 521 if (addr_cnt > 0) { 522 errmsg = "unexpected address"; 523 return ERR; 524 } else if (!isspace((unsigned char)*ibufp)) { 525 errmsg = "unexpected command suffix"; 526 return ERR; 527 } else if ((fnp = get_filename()) == NULL) 528 return ERR; 529 else if (*fnp == '!') { 530 errmsg = "invalid redirection"; 531 return ERR; 532 } 533 GET_COMMAND_SUFFIX(); 534 if (*fnp) strcpy(old_filename, fnp); 535 printf("%s\n", strip_escapes(old_filename)); 536 break; 537 case 'g': 538 case 'v': 539 case 'G': 540 case 'V': 541 if (isglobal) { 542 errmsg = "cannot nest global commands"; 543 return ERR; 544 } else if (check_addr_range(1, addr_last) < 0) 545 return ERR; 546 else if (build_active_list(c == 'g' || c == 'G') < 0) 547 return ERR; 548 else if ((n = (c == 'G' || c == 'V'))) 549 GET_COMMAND_SUFFIX(); 550 isglobal++; 551 if (exec_global(n, gflag) < 0) 552 return ERR; 553 break; 554 case 'h': 555 if (addr_cnt > 0) { 556 errmsg = "unexpected address"; 557 return ERR; 558 } 559 GET_COMMAND_SUFFIX(); 560 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 561 break; 562 case 'H': 563 if (addr_cnt > 0) { 564 errmsg = "unexpected address"; 565 return ERR; 566 } 567 GET_COMMAND_SUFFIX(); 568 if ((garrulous = 1 - garrulous) && *errmsg) 569 fprintf(stderr, "%s\n", errmsg); 570 break; 571 case 'i': 572 if (second_addr == 0) { 573 errmsg = "invalid address"; 574 return ERR; 575 } 576 GET_COMMAND_SUFFIX(); 577 if (!isglobal) clear_undo_stack(); 578 if (append_lines(second_addr - 1) < 0) 579 return ERR; 580 break; 581 case 'j': 582 if (check_addr_range(current_addr, current_addr + 1) < 0) 583 return ERR; 584 GET_COMMAND_SUFFIX(); 585 if (!isglobal) clear_undo_stack(); 586 if (first_addr != second_addr && 587 join_lines(first_addr, second_addr) < 0) 588 return ERR; 589 break; 590 case 'k': 591 c = *ibufp++; 592 if (second_addr == 0) { 593 errmsg = "invalid address"; 594 return ERR; 595 } 596 GET_COMMAND_SUFFIX(); 597 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 598 return ERR; 599 break; 600 case 'l': 601 if (check_addr_range(current_addr, current_addr) < 0) 602 return ERR; 603 GET_COMMAND_SUFFIX(); 604 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 605 return ERR; 606 gflag = 0; 607 break; 608 case 'm': 609 if (check_addr_range(current_addr, current_addr) < 0) 610 return ERR; 611 GET_THIRD_ADDR(addr); 612 if (first_addr <= addr && addr < second_addr) { 613 errmsg = "invalid destination"; 614 return ERR; 615 } 616 GET_COMMAND_SUFFIX(); 617 if (!isglobal) clear_undo_stack(); 618 if (move_lines(addr) < 0) 619 return ERR; 620 break; 621 case 'n': 622 if (check_addr_range(current_addr, current_addr) < 0) 623 return ERR; 624 GET_COMMAND_SUFFIX(); 625 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 626 return ERR; 627 gflag = 0; 628 break; 629 case 'p': 630 if (check_addr_range(current_addr, current_addr) < 0) 631 return ERR; 632 GET_COMMAND_SUFFIX(); 633 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 634 return ERR; 635 gflag = 0; 636 break; 637 case 'P': 638 if (addr_cnt > 0) { 639 errmsg = "unexpected address"; 640 return ERR; 641 } 642 GET_COMMAND_SUFFIX(); 643 prompt = prompt ? NULL : optarg ? optarg : dps; 644 break; 645 case 'q': 646 case 'Q': 647 if (addr_cnt > 0) { 648 errmsg = "unexpected address"; 649 return ERR; 650 } 651 GET_COMMAND_SUFFIX(); 652 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 653 break; 654 case 'r': 655 if (!isspace((unsigned char)*ibufp)) { 656 errmsg = "unexpected command suffix"; 657 return ERR; 658 } else if (addr_cnt == 0) 659 second_addr = addr_last; 660 if ((fnp = get_filename()) == NULL) 661 return ERR; 662 GET_COMMAND_SUFFIX(); 663 if (!isglobal) clear_undo_stack(); 664 if (*old_filename == '\0' && *fnp != '!') 665 strcpy(old_filename, fnp); 666 #ifdef BACKWARDS 667 if (*fnp == '\0' && *old_filename == '\0') { 668 errmsg = "no current filename"; 669 return ERR; 670 } 671 #endif 672 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 673 return ERR; 674 else if (addr && addr != addr_last) 675 modified = 1; 676 break; 677 case 's': 678 do { 679 switch(*ibufp) { 680 case '\n': 681 sflags |=SGF; 682 break; 683 case 'g': 684 sflags |= SGG; 685 ibufp++; 686 break; 687 case 'p': 688 sflags |= SGP; 689 ibufp++; 690 break; 691 case 'r': 692 sflags |= SGR; 693 ibufp++; 694 break; 695 case '0': case '1': case '2': case '3': case '4': 696 case '5': case '6': case '7': case '8': case '9': 697 STRTOL(sgnum, ibufp); 698 sflags |= SGF; 699 sgflag &= ~GSG; /* override GSG */ 700 break; 701 default: 702 if (sflags) { 703 errmsg = "invalid command suffix"; 704 return ERR; 705 } 706 } 707 } while (sflags && *ibufp != '\n'); 708 if (sflags && !pat) { 709 errmsg = "no previous substitution"; 710 return ERR; 711 } else if (sflags & SGG) 712 sgnum = 0; /* override numeric arg */ 713 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 714 errmsg = "invalid pattern delimiter"; 715 return ERR; 716 } 717 tpat = pat; 718 SPL1(); 719 if ((!sflags || (sflags & SGR)) && 720 (tpat = get_compiled_pattern()) == NULL) { 721 SPL0(); 722 return ERR; 723 } else if (tpat != pat) { 724 if (pat) { 725 regfree(pat); 726 free(pat); 727 } 728 pat = tpat; 729 patlock = 1; /* reserve pattern */ 730 } 731 SPL0(); 732 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 733 return ERR; 734 else if (isglobal) 735 sgflag |= GLB; 736 else 737 sgflag &= ~GLB; 738 if (sflags & SGG) 739 sgflag ^= GSG; 740 if (sflags & SGP) 741 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 742 do { 743 switch(*ibufp) { 744 case 'p': 745 sgflag |= GPR, ibufp++; 746 break; 747 case 'l': 748 sgflag |= GLS, ibufp++; 749 break; 750 case 'n': 751 sgflag |= GNP, ibufp++; 752 break; 753 default: 754 n++; 755 } 756 } while (!n); 757 if (check_addr_range(current_addr, current_addr) < 0) 758 return ERR; 759 GET_COMMAND_SUFFIX(); 760 if (!isglobal) clear_undo_stack(); 761 if (search_and_replace(pat, sgflag, sgnum) < 0) 762 return ERR; 763 break; 764 case 't': 765 if (check_addr_range(current_addr, current_addr) < 0) 766 return ERR; 767 GET_THIRD_ADDR(addr); 768 GET_COMMAND_SUFFIX(); 769 if (!isglobal) clear_undo_stack(); 770 if (copy_lines(addr) < 0) 771 return ERR; 772 break; 773 case 'u': 774 if (addr_cnt > 0) { 775 errmsg = "unexpected address"; 776 return ERR; 777 } 778 GET_COMMAND_SUFFIX(); 779 if (pop_undo_stack() < 0) 780 return ERR; 781 break; 782 case 'w': 783 case 'W': 784 if ((n = *ibufp) == 'q' || n == 'Q') { 785 gflag = EOF; 786 ibufp++; 787 } 788 if (!isspace((unsigned char)*ibufp)) { 789 errmsg = "unexpected command suffix"; 790 return ERR; 791 } else if ((fnp = get_filename()) == NULL) 792 return ERR; 793 if (addr_cnt == 0 && !addr_last) 794 first_addr = second_addr = 0; 795 else if (check_addr_range(1, addr_last) < 0) 796 return ERR; 797 GET_COMMAND_SUFFIX(); 798 if (*old_filename == '\0' && *fnp != '!') 799 strcpy(old_filename, fnp); 800 #ifdef BACKWARDS 801 if (*fnp == '\0' && *old_filename == '\0') { 802 errmsg = "no current filename"; 803 return ERR; 804 } 805 #endif 806 if ((addr = write_file(*fnp ? fnp : old_filename, 807 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 808 return ERR; 809 else if (addr == addr_last) 810 modified = 0; 811 else if (modified && !scripted && n == 'q') 812 gflag = EMOD; 813 break; 814 case 'x': 815 if (addr_cnt > 0) { 816 errmsg = "unexpected address"; 817 return ERR; 818 } 819 GET_COMMAND_SUFFIX(); 820 #ifdef DES 821 des = get_keyword(); 822 break; 823 #else 824 errmsg = "crypt unavailable"; 825 return ERR; 826 #endif 827 case 'z': 828 #ifdef BACKWARDS 829 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 830 #else 831 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 832 #endif 833 return ERR; 834 else if ('0' < *ibufp && *ibufp <= '9') 835 STRTOL(rows, ibufp); 836 GET_COMMAND_SUFFIX(); 837 if (display_lines(second_addr, min(addr_last, 838 second_addr + rows), gflag) < 0) 839 return ERR; 840 gflag = 0; 841 break; 842 case '=': 843 GET_COMMAND_SUFFIX(); 844 printf("%ld\n", addr_cnt ? second_addr : addr_last); 845 break; 846 case '!': 847 if (addr_cnt > 0) { 848 errmsg = "unexpected address"; 849 return ERR; 850 } else if ((sflags = get_shell_command()) < 0) 851 return ERR; 852 GET_COMMAND_SUFFIX(); 853 if (sflags) printf("%s\n", shcmd + 1); 854 system(shcmd + 1); 855 if (!scripted) printf("!\n"); 856 break; 857 case '\n': 858 #ifdef BACKWARDS 859 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 860 #else 861 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 862 #endif 863 || display_lines(second_addr, second_addr, 0) < 0) 864 return ERR; 865 break; 866 default: 867 errmsg = "unknown command"; 868 return ERR; 869 } 870 return gflag; 871 } 872 873 874 /* check_addr_range: return status of address range check */ 875 int 876 check_addr_range(long n, long m) 877 { 878 if (addr_cnt == 0) { 879 first_addr = n; 880 second_addr = m; 881 } 882 if (first_addr > second_addr || 1 > first_addr || 883 second_addr > addr_last) { 884 errmsg = "invalid address"; 885 return ERR; 886 } 887 return 0; 888 } 889 890 891 /* get_matching_node_addr: return the address of the next line matching a 892 pattern in a given direction. wrap around begin/end of editor buffer if 893 necessary */ 894 long 895 get_matching_node_addr(pattern_t *pat, int dir) 896 { 897 char *s; 898 long n = current_addr; 899 line_t *lp; 900 901 if (!pat) return ERR; 902 do { 903 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { 904 lp = get_addressed_line_node(n); 905 if ((s = get_sbuf_line(lp)) == NULL) 906 return ERR; 907 if (isbinary) 908 NUL_TO_NEWLINE(s, lp->len); 909 if (!regexec(pat, s, 0, NULL, 0)) 910 return n; 911 } 912 } while (n != current_addr); 913 errmsg = "no match"; 914 return ERR; 915 } 916 917 918 /* get_filename: return pointer to copy of filename in the command buffer */ 919 char * 920 get_filename(void) 921 { 922 static char *file = NULL; 923 static int filesz = 0; 924 925 int n; 926 927 if (*ibufp != '\n') { 928 SKIP_BLANKS(); 929 if (*ibufp == '\n') { 930 errmsg = "invalid filename"; 931 return NULL; 932 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 933 return NULL; 934 else if (*ibufp == '!') { 935 ibufp++; 936 if ((n = get_shell_command()) < 0) 937 return NULL; 938 if (n) 939 printf("%s\n", shcmd + 1); 940 return shcmd; 941 } else if (n > PATH_MAX - 1) { 942 errmsg = "filename too long"; 943 return NULL; 944 } 945 } 946 #ifndef BACKWARDS 947 else if (*old_filename == '\0') { 948 errmsg = "no current filename"; 949 return NULL; 950 } 951 #endif 952 REALLOC(file, filesz, PATH_MAX, NULL); 953 for (n = 0; *ibufp != '\n';) 954 file[n++] = *ibufp++; 955 file[n] = '\0'; 956 return is_legal_filename(file) ? file : NULL; 957 } 958 959 960 /* get_shell_command: read a shell command from stdin; return substitution 961 status */ 962 int 963 get_shell_command(void) 964 { 965 static char *buf = NULL; 966 static int n = 0; 967 968 char *s; /* substitution char pointer */ 969 int i = 0; 970 int j = 0; 971 972 if (red) { 973 errmsg = "shell access restricted"; 974 return ERR; 975 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 976 return ERR; 977 REALLOC(buf, n, j + 1, ERR); 978 buf[i++] = '!'; /* prefix command w/ bang */ 979 while (*ibufp != '\n') 980 switch (*ibufp) { 981 default: 982 REALLOC(buf, n, i + 2, ERR); 983 buf[i++] = *ibufp; 984 if (*ibufp++ == '\\') 985 buf[i++] = *ibufp++; 986 break; 987 case '!': 988 if (s != ibufp) { 989 REALLOC(buf, n, i + 1, ERR); 990 buf[i++] = *ibufp++; 991 } 992 #ifdef BACKWARDS 993 else if (shcmd == NULL || *(shcmd + 1) == '\0') 994 #else 995 else if (shcmd == NULL) 996 #endif 997 { 998 errmsg = "no previous command"; 999 return ERR; 1000 } else { 1001 REALLOC(buf, n, i + shcmdi, ERR); 1002 for (s = shcmd + 1; s < shcmd + shcmdi;) 1003 buf[i++] = *s++; 1004 s = ibufp++; 1005 } 1006 break; 1007 case '%': 1008 if (*old_filename == '\0') { 1009 errmsg = "no current filename"; 1010 return ERR; 1011 } 1012 j = strlen(s = strip_escapes(old_filename)); 1013 REALLOC(buf, n, i + j, ERR); 1014 while (j--) 1015 buf[i++] = *s++; 1016 s = ibufp++; 1017 break; 1018 } 1019 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1020 memcpy(shcmd, buf, i); 1021 shcmd[shcmdi = i] = '\0'; 1022 return *s == '!' || *s == '%'; 1023 } 1024 1025 1026 /* append_lines: insert text from stdin to after line n; stop when either a 1027 single period is read or EOF; return status */ 1028 int 1029 append_lines(long n) 1030 { 1031 int l; 1032 const char *lp = ibuf; 1033 const char *eot; 1034 undo_t *up = NULL; 1035 1036 for (current_addr = n;;) { 1037 if (!isglobal) { 1038 if ((l = get_tty_line()) < 0) 1039 return ERR; 1040 else if (l == 0 || ibuf[l - 1] != '\n') { 1041 clearerr(stdin); 1042 return l ? EOF : 0; 1043 } 1044 lp = ibuf; 1045 } else if (*(lp = ibufp) == '\0') 1046 return 0; 1047 else { 1048 while (*ibufp++ != '\n') 1049 ; 1050 l = ibufp - lp; 1051 } 1052 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1053 return 0; 1054 } 1055 eot = lp + l; 1056 SPL1(); 1057 do { 1058 if ((lp = put_sbuf_line(lp)) == NULL) { 1059 SPL0(); 1060 return ERR; 1061 } else if (up) 1062 up->t = get_addressed_line_node(current_addr); 1063 else if ((up = push_undo_stack(UADD, current_addr, 1064 current_addr)) == NULL) { 1065 SPL0(); 1066 return ERR; 1067 } 1068 } while (lp != eot); 1069 modified = 1; 1070 SPL0(); 1071 } 1072 /* NOTREACHED */ 1073 } 1074 1075 1076 /* join_lines: replace a range of lines with the joined text of those lines */ 1077 int 1078 join_lines(long from, long to) 1079 { 1080 static char *buf = NULL; 1081 static int n; 1082 1083 char *s; 1084 int size = 0; 1085 line_t *bp, *ep; 1086 1087 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1088 bp = get_addressed_line_node(from); 1089 for (; bp != ep; bp = bp->q_forw) { 1090 if ((s = get_sbuf_line(bp)) == NULL) 1091 return ERR; 1092 REALLOC(buf, n, size + bp->len, ERR); 1093 memcpy(buf + size, s, bp->len); 1094 size += bp->len; 1095 } 1096 REALLOC(buf, n, size + 2, ERR); 1097 memcpy(buf + size, "\n", 2); 1098 if (delete_lines(from, to) < 0) 1099 return ERR; 1100 current_addr = from - 1; 1101 SPL1(); 1102 if (put_sbuf_line(buf) == NULL || 1103 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1104 SPL0(); 1105 return ERR; 1106 } 1107 modified = 1; 1108 SPL0(); 1109 return 0; 1110 } 1111 1112 1113 /* move_lines: move a range of lines */ 1114 int 1115 move_lines(long addr) 1116 { 1117 line_t *b1, *a1, *b2, *a2; 1118 long n = INC_MOD(second_addr, addr_last); 1119 long p = first_addr - 1; 1120 int done = (addr == first_addr - 1 || addr == second_addr); 1121 1122 SPL1(); 1123 if (done) { 1124 a2 = get_addressed_line_node(n); 1125 b2 = get_addressed_line_node(p); 1126 current_addr = second_addr; 1127 } else if (push_undo_stack(UMOV, p, n) == NULL || 1128 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1129 SPL0(); 1130 return ERR; 1131 } else { 1132 a1 = get_addressed_line_node(n); 1133 if (addr < first_addr) { 1134 b1 = get_addressed_line_node(p); 1135 b2 = get_addressed_line_node(addr); 1136 /* this get_addressed_line_node last! */ 1137 } else { 1138 b2 = get_addressed_line_node(addr); 1139 b1 = get_addressed_line_node(p); 1140 /* this get_addressed_line_node last! */ 1141 } 1142 a2 = b2->q_forw; 1143 REQUE(b2, b1->q_forw); 1144 REQUE(a1->q_back, a2); 1145 REQUE(b1, a1); 1146 current_addr = addr + ((addr < first_addr) ? 1147 second_addr - first_addr + 1 : 0); 1148 } 1149 if (isglobal) 1150 unset_active_nodes(b2->q_forw, a2); 1151 modified = 1; 1152 SPL0(); 1153 return 0; 1154 } 1155 1156 1157 /* copy_lines: copy a range of lines; return status */ 1158 int 1159 copy_lines(long addr) 1160 { 1161 line_t *lp, *np = get_addressed_line_node(first_addr); 1162 undo_t *up = NULL; 1163 long n = second_addr - first_addr + 1; 1164 long m = 0; 1165 1166 current_addr = addr; 1167 if (first_addr <= addr && addr < second_addr) { 1168 n = addr - first_addr + 1; 1169 m = second_addr - addr; 1170 } 1171 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1172 for (; n-- > 0; np = np->q_forw) { 1173 SPL1(); 1174 if ((lp = dup_line_node(np)) == NULL) { 1175 SPL0(); 1176 return ERR; 1177 } 1178 add_line_node(lp); 1179 if (up) 1180 up->t = lp; 1181 else if ((up = push_undo_stack(UADD, current_addr, 1182 current_addr)) == NULL) { 1183 SPL0(); 1184 return ERR; 1185 } 1186 modified = 1; 1187 SPL0(); 1188 } 1189 return 0; 1190 } 1191 1192 1193 /* delete_lines: delete a range of lines */ 1194 int 1195 delete_lines(long from, long to) 1196 { 1197 line_t *n, *p; 1198 1199 SPL1(); 1200 if (push_undo_stack(UDEL, from, to) == NULL) { 1201 SPL0(); 1202 return ERR; 1203 } 1204 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1205 p = get_addressed_line_node(from - 1); 1206 /* this get_addressed_line_node last! */ 1207 if (isglobal) 1208 unset_active_nodes(p->q_forw, n); 1209 REQUE(p, n); 1210 addr_last -= to - from + 1; 1211 current_addr = from - 1; 1212 modified = 1; 1213 SPL0(); 1214 return 0; 1215 } 1216 1217 1218 /* display_lines: print a range of lines to stdout */ 1219 int 1220 display_lines(long from, long to, int gflag) 1221 { 1222 line_t *bp; 1223 line_t *ep; 1224 char *s; 1225 1226 if (!from) { 1227 errmsg = "invalid address"; 1228 return ERR; 1229 } 1230 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1231 bp = get_addressed_line_node(from); 1232 for (; bp != ep; bp = bp->q_forw) { 1233 if ((s = get_sbuf_line(bp)) == NULL) 1234 return ERR; 1235 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1236 return ERR; 1237 } 1238 return 0; 1239 } 1240 1241 1242 #define MAXMARK 26 /* max number of marks */ 1243 1244 line_t *mark[MAXMARK]; /* line markers */ 1245 int markno; /* line marker count */ 1246 1247 /* mark_line_node: set a line node mark */ 1248 int 1249 mark_line_node(line_t *lp, int n) 1250 { 1251 if (!islower((unsigned char)n)) { 1252 errmsg = "invalid mark character"; 1253 return ERR; 1254 } else if (mark[n - 'a'] == NULL) 1255 markno++; 1256 mark[n - 'a'] = lp; 1257 return 0; 1258 } 1259 1260 1261 /* get_marked_node_addr: return address of a marked line */ 1262 long 1263 get_marked_node_addr(int n) 1264 { 1265 if (!islower((unsigned char)n)) { 1266 errmsg = "invalid mark character"; 1267 return ERR; 1268 } 1269 return get_line_node_addr(mark[n - 'a']); 1270 } 1271 1272 1273 /* unmark_line_node: clear line node mark */ 1274 void 1275 unmark_line_node(line_t *lp) 1276 { 1277 int i; 1278 1279 for (i = 0; markno && i < MAXMARK; i++) 1280 if (mark[i] == lp) { 1281 mark[i] = NULL; 1282 markno--; 1283 } 1284 } 1285 1286 1287 /* dup_line_node: return a pointer to a copy of a line node */ 1288 line_t * 1289 dup_line_node(line_t *lp) 1290 { 1291 line_t *np; 1292 1293 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1294 fprintf(stderr, "%s\n", strerror(errno)); 1295 errmsg = "out of memory"; 1296 return NULL; 1297 } 1298 np->seek = lp->seek; 1299 np->len = lp->len; 1300 return np; 1301 } 1302 1303 1304 /* has_trailing_escape: return the parity of escapes preceding a character 1305 in a string */ 1306 int 1307 has_trailing_escape(char *s, char *t) 1308 { 1309 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1310 } 1311 1312 1313 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */ 1314 char * 1315 strip_escapes(char *s) 1316 { 1317 static char *file = NULL; 1318 static int filesz = 0; 1319 1320 int i = 0; 1321 1322 REALLOC(file, filesz, PATH_MAX, NULL); 1323 while (i < filesz - 1 /* Worry about a possible trailing escape */ 1324 && (file[i++] = (*s == '\\') ? *++s : *s)) 1325 s++; 1326 return file; 1327 } 1328 1329 1330 void 1331 signal_hup(int signo) 1332 { 1333 if (mutex) 1334 sigflags |= (1 << (signo - 1)); 1335 else 1336 handle_hup(signo); 1337 } 1338 1339 1340 void 1341 signal_int(int signo) 1342 { 1343 if (mutex) 1344 sigflags |= (1 << (signo - 1)); 1345 else 1346 handle_int(signo); 1347 } 1348 1349 1350 void 1351 handle_hup(int signo) 1352 { 1353 char *hup = NULL; /* hup filename */ 1354 char *s; 1355 char ed_hup[] = "ed.hup"; 1356 int n; 1357 1358 if (!sigactive) 1359 quit(1); 1360 sigflags &= ~(1 << (signo - 1)); 1361 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 && 1362 (s = getenv("HOME")) != NULL && 1363 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */ 1364 (hup = (char *) malloc(n + 10)) != NULL) { 1365 strcpy(hup, s); 1366 if (hup[n - 1] != '/') 1367 hup[n] = '/', hup[n+1] = '\0'; 1368 strcat(hup, "ed.hup"); 1369 write_file(hup, "w", 1, addr_last); 1370 } 1371 quit(2); 1372 } 1373 1374 1375 void 1376 handle_int(int signo) 1377 { 1378 if (!sigactive) 1379 quit(1); 1380 sigflags &= ~(1 << (signo - 1)); 1381 #ifdef _POSIX_SOURCE 1382 siglongjmp(env, -1); 1383 #else 1384 longjmp(env, -1); 1385 #endif 1386 } 1387 1388 1389 int cols = 72; /* wrap column */ 1390 1391 void 1392 handle_winch(int signo) 1393 { 1394 int save_errno = errno; 1395 1396 struct winsize ws; /* window size structure */ 1397 1398 sigflags &= ~(1 << (signo - 1)); 1399 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1400 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1401 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1402 } 1403 errno = save_errno; 1404 } 1405 1406 1407 /* is_legal_filename: return a legal filename */ 1408 int 1409 is_legal_filename(char *s) 1410 { 1411 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1412 errmsg = "shell access restricted"; 1413 return 0; 1414 } 1415 return 1; 1416 } 1417