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 * @(#) Copyright (c) 1993 Andrew Moore, Talke Studio. All rights reserved. 29 * @(#)main.c,v 1.1 1994/02/01 00:34:42 alm Exp 30 * $FreeBSD: src/bin/ed/main.c,v 1.14.2.4 2001/08/01 02:36:03 obrien Exp $ 31 * $DragonFly: src/bin/ed/main.c,v 1.4 2004/03/19 17:47:48 cpressey Exp $ 32 */ 33 34 /* 35 * CREDITS 36 * 37 * This program is based on the editor algorithm described in 38 * Brian W. Kernighan and P. J. Plauger's book "Software Tools 39 * in Pascal," Addison-Wesley, 1981. 40 * 41 * The buffering algorithm is attributed to Rodney Ruddock of 42 * the University of Guelph, Guelph, Ontario. 43 * 44 * The cbc.c encryption code is adapted from 45 * the bdes program by Matt Bishop of Dartmouth College, 46 * Hanover, NH. 47 * 48 */ 49 50 #include <sys/types.h> 51 52 #include <sys/ioctl.h> 53 #include <sys/wait.h> 54 #include <ctype.h> 55 #include <locale.h> 56 #include <pwd.h> 57 #include <setjmp.h> 58 59 #include "ed.h" 60 61 62 #ifdef _POSIX_SOURCE 63 sigjmp_buf env; 64 #else 65 jmp_buf env; 66 #endif 67 68 /* static buffers */ 69 char stdinbuf[1]; /* stdin buffer */ 70 char *shcmd; /* shell command buffer */ 71 int shcmdsz; /* shell command buffer size */ 72 int shcmdi; /* shell command buffer index */ 73 char *ibuf; /* ed command-line buffer */ 74 int ibufsz; /* ed command-line buffer size */ 75 char *ibufp; /* pointer to ed command-line buffer */ 76 77 /* global flags */ 78 int des = 0; /* if set, use crypt(3) for i/o */ 79 int garrulous = 0; /* if set, print all error messages */ 80 int isbinary; /* if set, buffer contains ASCII NULs */ 81 int isglobal; /* if set, doing a global command */ 82 int modified; /* if set, buffer modified since last write */ 83 int mutex = 0; /* if set, signals set "sigflags" */ 84 int red = 0; /* if set, restrict shell/directory access */ 85 int scripted = 0; /* if set, suppress diagnostics */ 86 int sigflags = 0; /* if set, signals received while mutex set */ 87 int sigactive = 0; /* if set, signal handlers are enabled */ 88 89 char old_filename[PATH_MAX] = ""; /* default filename */ 90 long current_addr; /* current address in editor buffer */ 91 long addr_last; /* last address in editor buffer */ 92 int lineno; /* script line number */ 93 const char *prompt; /* command-line prompt */ 94 const char *dps = "*"; /* default command-line prompt */ 95 96 const char usage[] = "usage: %s [-] [-sx] [-p string] [name]\n"; 97 98 /* ed: line editor */ 99 int 100 main(int argc, char **argv) 101 { 102 int c, n; 103 long status = 0; 104 #if __GNUC__ 105 /* Avoid longjmp clobbering */ 106 (void) &argc; 107 (void) &argv; 108 #endif 109 110 (void)setlocale(LC_ALL, ""); 111 112 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 113 top: 114 while ((c = getopt(argc, argv, "p:sx")) != -1) 115 switch(c) { 116 case 'p': /* set prompt */ 117 prompt = optarg; 118 break; 119 case 's': /* run script */ 120 scripted = 1; 121 break; 122 case 'x': /* use crypt */ 123 #ifdef DES 124 des = get_keyword(); 125 #else 126 fprintf(stderr, "crypt unavailable\n?\n"); 127 #endif 128 break; 129 130 default: 131 fprintf(stderr, usage, argv[0]); 132 exit(1); 133 } 134 argv += optind; 135 argc -= optind; 136 if (argc && **argv == '-') { 137 scripted = 1; 138 if (argc > 1) { 139 optind = 1; 140 goto top; 141 } 142 argv++; 143 argc--; 144 } 145 /* assert: reliable signals! */ 146 #ifdef SIGWINCH 147 handle_winch(SIGWINCH); 148 if (isatty(0)) signal(SIGWINCH, handle_winch); 149 #endif 150 signal(SIGHUP, signal_hup); 151 signal(SIGQUIT, SIG_IGN); 152 signal(SIGINT, signal_int); 153 #ifdef _POSIX_SOURCE 154 if ((status = sigsetjmp(env, 1))) 155 #else 156 if ((status = setjmp(env))) 157 #endif 158 { 159 fputs("\n?\n", stderr); 160 sprintf(errmsg, "interrupt"); 161 } else { 162 init_buffers(); 163 sigactive = 1; /* enable signal handlers */ 164 if (argc && **argv && is_legal_filename(*argv)) { 165 if (read_file(*argv, 0) < 0 && !isatty(0)) 166 quit(2); 167 else if (**argv != '!') 168 if (strlcpy(old_filename, *argv, sizeof(old_filename)) 169 >= sizeof(old_filename)) 170 quit(2); 171 } else if (argc) { 172 fputs("?\n", stderr); 173 if (**argv == '\0') 174 sprintf(errmsg, "invalid filename"); 175 if (!isatty(0)) 176 quit(2); 177 } 178 } 179 for (;;) { 180 if (status < 0 && garrulous) 181 fprintf(stderr, "%s\n", errmsg); 182 if (prompt) { 183 printf("%s", prompt); 184 fflush(stdout); 185 } 186 if ((n = get_tty_line()) < 0) { 187 status = ERR; 188 continue; 189 } else if (n == 0) { 190 if (modified && !scripted) { 191 fputs("?\n", stderr); 192 sprintf(errmsg, "warning: file modified"); 193 if (!isatty(0)) { 194 fprintf(stderr, garrulous ? 195 "script, line %d: %s\n" : 196 "", lineno, errmsg); 197 quit(2); 198 } 199 clearerr(stdin); 200 modified = 0; 201 status = EMOD; 202 continue; 203 } else 204 quit(0); 205 } else if (ibuf[n - 1] != '\n') { 206 /* discard line */ 207 sprintf(errmsg, "unexpected end-of-file"); 208 clearerr(stdin); 209 status = ERR; 210 continue; 211 } 212 isglobal = 0; 213 if ((status = extract_addr_range()) >= 0 && 214 (status = exec_command()) >= 0) 215 if (!status || 216 (status = display_lines(current_addr, current_addr, 217 status)) >= 0) 218 continue; 219 switch (status) { 220 case EOF: 221 quit(0); 222 case EMOD: 223 modified = 0; 224 fputs("?\n", stderr); /* give warning */ 225 sprintf(errmsg, "warning: file modified"); 226 if (!isatty(0)) { 227 fprintf(stderr, garrulous ? 228 "script, line %d: %s\n" : 229 "", lineno, errmsg); 230 quit(2); 231 } 232 break; 233 case FATAL: 234 if (!isatty(0)) 235 fprintf(stderr, garrulous ? 236 "script, line %d: %s\n" : "", 237 lineno, errmsg); 238 else 239 fprintf(stderr, garrulous ? "%s\n" : "", 240 errmsg); 241 quit(3); 242 default: 243 fputs("?\n", stderr); 244 if (!isatty(0)) { 245 fprintf(stderr, garrulous ? 246 "script, line %d: %s\n" : "", 247 lineno, errmsg); 248 quit(2); 249 } 250 break; 251 } 252 } 253 /*NOTREACHED*/ 254 } 255 256 long first_addr, second_addr, addr_cnt; 257 258 /* extract_addr_range: get line addresses from the command buffer until an 259 illegal address is seen; return status */ 260 int 261 extract_addr_range(void) 262 { 263 long addr; 264 265 addr_cnt = 0; 266 first_addr = second_addr = current_addr; 267 while ((addr = next_addr()) >= 0) { 268 addr_cnt++; 269 first_addr = second_addr; 270 second_addr = addr; 271 if (*ibufp != ',' && *ibufp != ';') 272 break; 273 else if (*ibufp++ == ';') 274 current_addr = addr; 275 } 276 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 277 first_addr = second_addr; 278 return (addr == ERR) ? ERR : 0; 279 } 280 281 282 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++ 283 284 #define MUST_BE_FIRST() \ 285 if (!first) { sprintf(errmsg, "invalid address"); return ERR; } 286 287 /* next_addr: return the next line address in the command buffer */ 288 long 289 next_addr(void) 290 { 291 char *hd; 292 long addr = current_addr; 293 long n; 294 int first = 1; 295 int c; 296 297 SKIP_BLANKS(); 298 for (hd = ibufp;; first = 0) 299 switch (c = *ibufp) { 300 case '+': 301 case '\t': 302 case ' ': 303 case '-': 304 case '^': 305 ibufp++; 306 SKIP_BLANKS(); 307 if (isdigit((unsigned char)*ibufp)) { 308 STRTOL(n, ibufp); 309 addr += (c == '-' || c == '^') ? -n : n; 310 } else if (!isspace((unsigned char)c)) 311 addr += (c == '-' || c == '^') ? -1 : 1; 312 break; 313 case '0': case '1': case '2': 314 case '3': case '4': case '5': 315 case '6': case '7': case '8': case '9': 316 MUST_BE_FIRST(); 317 STRTOL(addr, ibufp); 318 break; 319 case '.': 320 case '$': 321 MUST_BE_FIRST(); 322 ibufp++; 323 addr = (c == '.') ? current_addr : addr_last; 324 break; 325 case '/': 326 case '?': 327 MUST_BE_FIRST(); 328 if ((addr = get_matching_node_addr( 329 get_compiled_pattern(), c == '/')) < 0) 330 return ERR; 331 else if (c == *ibufp) 332 ibufp++; 333 break; 334 case '\'': 335 MUST_BE_FIRST(); 336 ibufp++; 337 if ((addr = get_marked_node_addr(*ibufp++)) < 0) 338 return ERR; 339 break; 340 case '%': 341 case ',': 342 case ';': 343 if (first) { 344 ibufp++; 345 addr_cnt++; 346 second_addr = (c == ';') ? current_addr : 1; 347 addr = addr_last; 348 break; 349 } 350 /* FALL THROUGH */ 351 default: 352 if (ibufp == hd) 353 return EOF; 354 else if (addr < 0 || addr_last < addr) { 355 sprintf(errmsg, "invalid address"); 356 return ERR; 357 } else 358 return addr; 359 } 360 /* NOTREACHED */ 361 } 362 363 364 #ifdef BACKWARDS 365 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 366 #define GET_THIRD_ADDR(addr) \ 367 { \ 368 long ol1, ol2; \ 369 \ 370 ol1 = first_addr, ol2 = second_addr; \ 371 if (extract_addr_range() < 0) \ 372 return ERR; \ 373 else if (addr_cnt == 0) { \ 374 sprintf(errmsg, "destination expected"); \ 375 return ERR; \ 376 } else if (second_addr < 0 || addr_last < second_addr) { \ 377 sprintf(errmsg, "invalid address"); \ 378 return ERR; \ 379 } \ 380 addr = second_addr; \ 381 first_addr = ol1, second_addr = ol2; \ 382 } 383 #else /* BACKWARDS */ 384 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 385 #define GET_THIRD_ADDR(addr) \ 386 { \ 387 long ol1, ol2; \ 388 \ 389 ol1 = first_addr, ol2 = second_addr; \ 390 if (extract_addr_range() < 0) \ 391 return ERR; \ 392 if (second_addr < 0 || addr_last < second_addr) { \ 393 sprintf(errmsg, "invalid address"); \ 394 return ERR; \ 395 } \ 396 addr = second_addr; \ 397 first_addr = ol1, second_addr = ol2; \ 398 } 399 #endif 400 401 402 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 403 #define GET_COMMAND_SUFFIX() { \ 404 int done = 0; \ 405 do { \ 406 switch(*ibufp) { \ 407 case 'p': \ 408 gflag |= GPR, ibufp++; \ 409 break; \ 410 case 'l': \ 411 gflag |= GLS, ibufp++; \ 412 break; \ 413 case 'n': \ 414 gflag |= GNP, ibufp++; \ 415 break; \ 416 default: \ 417 done++; \ 418 } \ 419 } while (!done); \ 420 if (*ibufp++ != '\n') { \ 421 sprintf(errmsg, "invalid command suffix"); \ 422 return ERR; \ 423 } \ 424 } 425 426 427 /* sflags */ 428 #define SGG 001 /* complement previous global substitute suffix */ 429 #define SGP 002 /* complement previous print suffix */ 430 #define SGR 004 /* use last regex instead of last pat */ 431 #define SGF 010 /* repeat last substitution */ 432 433 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 434 435 long rows = 22; /* scroll length: ws_row - 2 */ 436 437 /* exec_command: execute the next command in command buffer; return print 438 request, if any */ 439 int 440 exec_command(void) 441 { 442 extern long u_current_addr; 443 extern long u_addr_last; 444 445 static pattern_t *pat = NULL; 446 static int sgflag = 0; 447 static long sgnum = 0; 448 449 pattern_t *tpat; 450 char *fnp; 451 int gflag = 0; 452 int sflags = 0; 453 long addr = 0; 454 int n = 0; 455 int c; 456 457 SKIP_BLANKS(); 458 switch(c = *ibufp++) { 459 case 'a': 460 GET_COMMAND_SUFFIX(); 461 if (!isglobal) clear_undo_stack(); 462 if (append_lines(second_addr) < 0) 463 return ERR; 464 break; 465 case 'c': 466 if (check_addr_range(current_addr, current_addr) < 0) 467 return ERR; 468 GET_COMMAND_SUFFIX(); 469 if (!isglobal) clear_undo_stack(); 470 if (delete_lines(first_addr, second_addr) < 0 || 471 append_lines(current_addr) < 0) 472 return ERR; 473 break; 474 case 'd': 475 if (check_addr_range(current_addr, current_addr) < 0) 476 return ERR; 477 GET_COMMAND_SUFFIX(); 478 if (!isglobal) clear_undo_stack(); 479 if (delete_lines(first_addr, second_addr) < 0) 480 return ERR; 481 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 482 current_addr = addr; 483 break; 484 case 'e': 485 if (modified && !scripted) 486 return EMOD; 487 /* fall through */ 488 case 'E': 489 if (addr_cnt > 0) { 490 sprintf(errmsg, "unexpected address"); 491 return ERR; 492 } else if (!isspace((unsigned char)*ibufp)) { 493 sprintf(errmsg, "unexpected command suffix"); 494 return ERR; 495 } else if ((fnp = get_filename()) == NULL) 496 return ERR; 497 GET_COMMAND_SUFFIX(); 498 if (delete_lines(1, addr_last) < 0) 499 return ERR; 500 clear_undo_stack(); 501 if (close_sbuf() < 0) 502 return ERR; 503 else if (open_sbuf() < 0) 504 return FATAL; 505 if (*fnp && *fnp != '!') strcpy(old_filename, fnp); 506 #ifdef BACKWARDS 507 if (*fnp == '\0' && *old_filename == '\0') { 508 sprintf(errmsg, "no current filename"); 509 return ERR; 510 } 511 #endif 512 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 513 return ERR; 514 clear_undo_stack(); 515 modified = 0; 516 u_current_addr = u_addr_last = -1; 517 break; 518 case 'f': 519 if (addr_cnt > 0) { 520 sprintf(errmsg, "unexpected address"); 521 return ERR; 522 } else if (!isspace((unsigned char)*ibufp)) { 523 sprintf(errmsg, "unexpected command suffix"); 524 return ERR; 525 } else if ((fnp = get_filename()) == NULL) 526 return ERR; 527 else if (*fnp == '!') { 528 sprintf(errmsg, "invalid redirection"); 529 return ERR; 530 } 531 GET_COMMAND_SUFFIX(); 532 if (*fnp) strcpy(old_filename, fnp); 533 printf("%s\n", strip_escapes(old_filename)); 534 break; 535 case 'g': 536 case 'v': 537 case 'G': 538 case 'V': 539 if (isglobal) { 540 sprintf(errmsg, "cannot nest global commands"); 541 return ERR; 542 } else if (check_addr_range(1, addr_last) < 0) 543 return ERR; 544 else if (build_active_list(c == 'g' || c == 'G') < 0) 545 return ERR; 546 else if ((n = (c == 'G' || c == 'V'))) 547 GET_COMMAND_SUFFIX(); 548 isglobal++; 549 if (exec_global(n, gflag) < 0) 550 return ERR; 551 break; 552 case 'h': 553 if (addr_cnt > 0) { 554 sprintf(errmsg, "unexpected address"); 555 return ERR; 556 } 557 GET_COMMAND_SUFFIX(); 558 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 559 break; 560 case 'H': 561 if (addr_cnt > 0) { 562 sprintf(errmsg, "unexpected address"); 563 return ERR; 564 } 565 GET_COMMAND_SUFFIX(); 566 if ((garrulous = 1 - garrulous) && *errmsg) 567 fprintf(stderr, "%s\n", errmsg); 568 break; 569 case 'i': 570 if (second_addr == 0) { 571 sprintf(errmsg, "invalid address"); 572 return ERR; 573 } 574 GET_COMMAND_SUFFIX(); 575 if (!isglobal) clear_undo_stack(); 576 if (append_lines(second_addr - 1) < 0) 577 return ERR; 578 break; 579 case 'j': 580 if (check_addr_range(current_addr, current_addr + 1) < 0) 581 return ERR; 582 GET_COMMAND_SUFFIX(); 583 if (!isglobal) clear_undo_stack(); 584 if (first_addr != second_addr && 585 join_lines(first_addr, second_addr) < 0) 586 return ERR; 587 break; 588 case 'k': 589 c = *ibufp++; 590 if (second_addr == 0) { 591 sprintf(errmsg, "invalid address"); 592 return ERR; 593 } 594 GET_COMMAND_SUFFIX(); 595 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 596 return ERR; 597 break; 598 case 'l': 599 if (check_addr_range(current_addr, current_addr) < 0) 600 return ERR; 601 GET_COMMAND_SUFFIX(); 602 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 603 return ERR; 604 gflag = 0; 605 break; 606 case 'm': 607 if (check_addr_range(current_addr, current_addr) < 0) 608 return ERR; 609 GET_THIRD_ADDR(addr); 610 if (first_addr <= addr && addr < second_addr) { 611 sprintf(errmsg, "invalid destination"); 612 return ERR; 613 } 614 GET_COMMAND_SUFFIX(); 615 if (!isglobal) clear_undo_stack(); 616 if (move_lines(addr) < 0) 617 return ERR; 618 break; 619 case 'n': 620 if (check_addr_range(current_addr, current_addr) < 0) 621 return ERR; 622 GET_COMMAND_SUFFIX(); 623 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 624 return ERR; 625 gflag = 0; 626 break; 627 case 'p': 628 if (check_addr_range(current_addr, current_addr) < 0) 629 return ERR; 630 GET_COMMAND_SUFFIX(); 631 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 632 return ERR; 633 gflag = 0; 634 break; 635 case 'P': 636 if (addr_cnt > 0) { 637 sprintf(errmsg, "unexpected address"); 638 return ERR; 639 } 640 GET_COMMAND_SUFFIX(); 641 prompt = prompt ? NULL : optarg ? optarg : dps; 642 break; 643 case 'q': 644 case 'Q': 645 if (addr_cnt > 0) { 646 sprintf(errmsg, "unexpected address"); 647 return ERR; 648 } 649 GET_COMMAND_SUFFIX(); 650 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 651 break; 652 case 'r': 653 if (!isspace((unsigned char)*ibufp)) { 654 sprintf(errmsg, "unexpected command suffix"); 655 return ERR; 656 } else if (addr_cnt == 0) 657 second_addr = addr_last; 658 if ((fnp = get_filename()) == NULL) 659 return ERR; 660 GET_COMMAND_SUFFIX(); 661 if (!isglobal) clear_undo_stack(); 662 if (*old_filename == '\0' && *fnp != '!') 663 strcpy(old_filename, fnp); 664 #ifdef BACKWARDS 665 if (*fnp == '\0' && *old_filename == '\0') { 666 sprintf(errmsg, "no current filename"); 667 return ERR; 668 } 669 #endif 670 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 671 return ERR; 672 else if (addr && addr != addr_last) 673 modified = 1; 674 break; 675 case 's': 676 do { 677 switch(*ibufp) { 678 case '\n': 679 sflags |=SGF; 680 break; 681 case 'g': 682 sflags |= SGG; 683 ibufp++; 684 break; 685 case 'p': 686 sflags |= SGP; 687 ibufp++; 688 break; 689 case 'r': 690 sflags |= SGR; 691 ibufp++; 692 break; 693 case '0': case '1': case '2': case '3': case '4': 694 case '5': case '6': case '7': case '8': case '9': 695 STRTOL(sgnum, ibufp); 696 sflags |= SGF; 697 sgflag &= ~GSG; /* override GSG */ 698 break; 699 default: 700 if (sflags) { 701 sprintf(errmsg, "invalid command suffix"); 702 return ERR; 703 } 704 } 705 } while (sflags && *ibufp != '\n'); 706 if (sflags && !pat) { 707 sprintf(errmsg, "no previous substitution"); 708 return ERR; 709 } else if (sflags & SGG) 710 sgnum = 0; /* override numeric arg */ 711 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 712 sprintf(errmsg, "invalid pattern delimiter"); 713 return ERR; 714 } 715 tpat = pat; 716 SPL1(); 717 if ((!sflags || (sflags & SGR)) && 718 (tpat = get_compiled_pattern()) == NULL) { 719 SPL0(); 720 return ERR; 721 } else if (tpat != pat) { 722 if (pat) { 723 regfree(pat); 724 free(pat); 725 } 726 pat = tpat; 727 patlock = 1; /* reserve pattern */ 728 } 729 SPL0(); 730 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 731 return ERR; 732 else if (isglobal) 733 sgflag |= GLB; 734 else 735 sgflag &= ~GLB; 736 if (sflags & SGG) 737 sgflag ^= GSG; 738 if (sflags & SGP) 739 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 740 do { 741 switch(*ibufp) { 742 case 'p': 743 sgflag |= GPR, ibufp++; 744 break; 745 case 'l': 746 sgflag |= GLS, ibufp++; 747 break; 748 case 'n': 749 sgflag |= GNP, ibufp++; 750 break; 751 default: 752 n++; 753 } 754 } while (!n); 755 if (check_addr_range(current_addr, current_addr) < 0) 756 return ERR; 757 GET_COMMAND_SUFFIX(); 758 if (!isglobal) clear_undo_stack(); 759 if (search_and_replace(pat, sgflag, sgnum) < 0) 760 return ERR; 761 break; 762 case 't': 763 if (check_addr_range(current_addr, current_addr) < 0) 764 return ERR; 765 GET_THIRD_ADDR(addr); 766 GET_COMMAND_SUFFIX(); 767 if (!isglobal) clear_undo_stack(); 768 if (copy_lines(addr) < 0) 769 return ERR; 770 break; 771 case 'u': 772 if (addr_cnt > 0) { 773 sprintf(errmsg, "unexpected address"); 774 return ERR; 775 } 776 GET_COMMAND_SUFFIX(); 777 if (pop_undo_stack() < 0) 778 return ERR; 779 break; 780 case 'w': 781 case 'W': 782 if ((n = *ibufp) == 'q' || n == 'Q') { 783 gflag = EOF; 784 ibufp++; 785 } 786 if (!isspace((unsigned char)*ibufp)) { 787 sprintf(errmsg, "unexpected command suffix"); 788 return ERR; 789 } else if ((fnp = get_filename()) == NULL) 790 return ERR; 791 if (addr_cnt == 0 && !addr_last) 792 first_addr = second_addr = 0; 793 else if (check_addr_range(1, addr_last) < 0) 794 return ERR; 795 GET_COMMAND_SUFFIX(); 796 if (*old_filename == '\0' && *fnp != '!') 797 strcpy(old_filename, fnp); 798 #ifdef BACKWARDS 799 if (*fnp == '\0' && *old_filename == '\0') { 800 sprintf(errmsg, "no current filename"); 801 return ERR; 802 } 803 #endif 804 if ((addr = write_file(*fnp ? fnp : old_filename, 805 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 806 return ERR; 807 else if (addr == addr_last) 808 modified = 0; 809 else if (modified && !scripted && n == 'q') 810 gflag = EMOD; 811 break; 812 case 'x': 813 if (addr_cnt > 0) { 814 sprintf(errmsg, "unexpected address"); 815 return ERR; 816 } 817 GET_COMMAND_SUFFIX(); 818 #ifdef DES 819 des = get_keyword(); 820 #else 821 sprintf(errmsg, "crypt unavailable"); 822 return ERR; 823 #endif 824 break; 825 case 'z': 826 #ifdef BACKWARDS 827 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 828 #else 829 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 830 #endif 831 return ERR; 832 else if ('0' < *ibufp && *ibufp <= '9') 833 STRTOL(rows, ibufp); 834 GET_COMMAND_SUFFIX(); 835 if (display_lines(second_addr, min(addr_last, 836 second_addr + rows), gflag) < 0) 837 return ERR; 838 gflag = 0; 839 break; 840 case '=': 841 GET_COMMAND_SUFFIX(); 842 printf("%ld\n", addr_cnt ? second_addr : addr_last); 843 break; 844 case '!': 845 if (addr_cnt > 0) { 846 sprintf(errmsg, "unexpected address"); 847 return ERR; 848 } else if ((sflags = get_shell_command()) < 0) 849 return ERR; 850 GET_COMMAND_SUFFIX(); 851 if (sflags) printf("%s\n", shcmd + 1); 852 system(shcmd + 1); 853 if (!scripted) printf("!\n"); 854 break; 855 case '\n': 856 #ifdef BACKWARDS 857 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 858 #else 859 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 860 #endif 861 || display_lines(second_addr, second_addr, 0) < 0) 862 return ERR; 863 break; 864 default: 865 sprintf(errmsg, "unknown command"); 866 return ERR; 867 } 868 return gflag; 869 } 870 871 872 /* check_addr_range: return status of address range check */ 873 int 874 check_addr_range(long n, long m) 875 { 876 if (addr_cnt == 0) { 877 first_addr = n; 878 second_addr = m; 879 } 880 if (first_addr > second_addr || 1 > first_addr || 881 second_addr > addr_last) { 882 sprintf(errmsg, "invalid address"); 883 return ERR; 884 } 885 return 0; 886 } 887 888 889 /* get_matching_node_addr: return the address of the next line matching a 890 pattern in a given direction. wrap around begin/end of editor buffer if 891 necessary */ 892 long 893 get_matching_node_addr(pattern_t *pat, int dir) 894 { 895 char *s; 896 long n = current_addr; 897 line_t *lp; 898 899 if (!pat) return ERR; 900 do { 901 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { 902 lp = get_addressed_line_node(n); 903 if ((s = get_sbuf_line(lp)) == NULL) 904 return ERR; 905 if (isbinary) 906 NUL_TO_NEWLINE(s, lp->len); 907 if (!regexec(pat, s, 0, NULL, 0)) 908 return n; 909 } 910 } while (n != current_addr); 911 sprintf(errmsg, "no match"); 912 return ERR; 913 } 914 915 916 /* get_filename: return pointer to copy of filename in the command buffer */ 917 char * 918 get_filename(void) 919 { 920 static char *file = NULL; 921 static int filesz = 0; 922 923 int n; 924 925 if (*ibufp != '\n') { 926 SKIP_BLANKS(); 927 if (*ibufp == '\n') { 928 sprintf(errmsg, "invalid filename"); 929 return NULL; 930 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 931 return NULL; 932 else if (*ibufp == '!') { 933 ibufp++; 934 if ((n = get_shell_command()) < 0) 935 return NULL; 936 if (n) 937 printf("%s\n", shcmd + 1); 938 return shcmd; 939 } else if (n > PATH_MAX - 1) { 940 sprintf(errmsg, "filename too long"); 941 return NULL; 942 } 943 } 944 #ifndef BACKWARDS 945 else if (*old_filename == '\0') { 946 sprintf(errmsg, "no current filename"); 947 return NULL; 948 } 949 #endif 950 REALLOC(file, filesz, PATH_MAX, NULL); 951 for (n = 0; *ibufp != '\n';) 952 file[n++] = *ibufp++; 953 file[n] = '\0'; 954 return is_legal_filename(file) ? file : NULL; 955 } 956 957 958 /* get_shell_command: read a shell command from stdin; return substitution 959 status */ 960 int 961 get_shell_command(void) 962 { 963 static char *buf = NULL; 964 static int n = 0; 965 966 char *s; /* substitution char pointer */ 967 int i = 0; 968 int j = 0; 969 970 if (red) { 971 sprintf(errmsg, "shell access restricted"); 972 return ERR; 973 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 974 return ERR; 975 REALLOC(buf, n, j + 1, ERR); 976 buf[i++] = '!'; /* prefix command w/ bang */ 977 while (*ibufp != '\n') 978 switch (*ibufp) { 979 default: 980 REALLOC(buf, n, i + 2, ERR); 981 buf[i++] = *ibufp; 982 if (*ibufp++ == '\\') 983 buf[i++] = *ibufp++; 984 break; 985 case '!': 986 if (s != ibufp) { 987 REALLOC(buf, n, i + 1, ERR); 988 buf[i++] = *ibufp++; 989 } 990 #ifdef BACKWARDS 991 else if (shcmd == NULL || *(shcmd + 1) == '\0') 992 #else 993 else if (shcmd == NULL) 994 #endif 995 { 996 sprintf(errmsg, "no previous command"); 997 return ERR; 998 } else { 999 REALLOC(buf, n, i + shcmdi, ERR); 1000 for (s = shcmd + 1; s < shcmd + shcmdi;) 1001 buf[i++] = *s++; 1002 s = ibufp++; 1003 } 1004 break; 1005 case '%': 1006 if (*old_filename == '\0') { 1007 sprintf(errmsg, "no current filename"); 1008 return ERR; 1009 } 1010 j = strlen(s = strip_escapes(old_filename)); 1011 REALLOC(buf, n, i + j, ERR); 1012 while (j--) 1013 buf[i++] = *s++; 1014 s = ibufp++; 1015 break; 1016 } 1017 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1018 memcpy(shcmd, buf, i); 1019 shcmd[shcmdi = i] = '\0'; 1020 return *s == '!' || *s == '%'; 1021 } 1022 1023 1024 /* append_lines: insert text from stdin to after line n; stop when either a 1025 single period is read or EOF; return status */ 1026 int 1027 append_lines(long n) 1028 { 1029 int l; 1030 char *lp = ibuf; 1031 char *eot; 1032 undo_t *up = NULL; 1033 1034 for (current_addr = n;;) { 1035 if (!isglobal) { 1036 if ((l = get_tty_line()) < 0) 1037 return ERR; 1038 else if (l == 0 || ibuf[l - 1] != '\n') { 1039 clearerr(stdin); 1040 return l ? EOF : 0; 1041 } 1042 lp = ibuf; 1043 } else if (*(lp = ibufp) == '\0') 1044 return 0; 1045 else { 1046 while (*ibufp++ != '\n') 1047 ; 1048 l = ibufp - lp; 1049 } 1050 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1051 return 0; 1052 } 1053 eot = lp + l; 1054 SPL1(); 1055 do { 1056 if ((lp = put_sbuf_line(lp)) == NULL) { 1057 SPL0(); 1058 return ERR; 1059 } else if (up) 1060 up->t = get_addressed_line_node(current_addr); 1061 else if ((up = push_undo_stack(UADD, current_addr, 1062 current_addr)) == NULL) { 1063 SPL0(); 1064 return ERR; 1065 } 1066 } while (lp != eot); 1067 modified = 1; 1068 SPL0(); 1069 } 1070 /* NOTREACHED */ 1071 } 1072 1073 1074 /* join_lines: replace a range of lines with the joined text of those lines */ 1075 int 1076 join_lines(long from, long to) 1077 { 1078 static char *buf = NULL; 1079 static int n; 1080 1081 char *s; 1082 int size = 0; 1083 line_t *bp, *ep; 1084 1085 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1086 bp = get_addressed_line_node(from); 1087 for (; bp != ep; bp = bp->q_forw) { 1088 if ((s = get_sbuf_line(bp)) == NULL) 1089 return ERR; 1090 REALLOC(buf, n, size + bp->len, ERR); 1091 memcpy(buf + size, s, bp->len); 1092 size += bp->len; 1093 } 1094 REALLOC(buf, n, size + 2, ERR); 1095 memcpy(buf + size, "\n", 2); 1096 if (delete_lines(from, to) < 0) 1097 return ERR; 1098 current_addr = from - 1; 1099 SPL1(); 1100 if (put_sbuf_line(buf) == NULL || 1101 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1102 SPL0(); 1103 return ERR; 1104 } 1105 modified = 1; 1106 SPL0(); 1107 return 0; 1108 } 1109 1110 1111 /* move_lines: move a range of lines */ 1112 int 1113 move_lines(long addr) 1114 { 1115 line_t *b1, *a1, *b2, *a2; 1116 long n = INC_MOD(second_addr, addr_last); 1117 long p = first_addr - 1; 1118 int done = (addr == first_addr - 1 || addr == second_addr); 1119 1120 SPL1(); 1121 if (done) { 1122 a2 = get_addressed_line_node(n); 1123 b2 = get_addressed_line_node(p); 1124 current_addr = second_addr; 1125 } else if (push_undo_stack(UMOV, p, n) == NULL || 1126 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1127 SPL0(); 1128 return ERR; 1129 } else { 1130 a1 = get_addressed_line_node(n); 1131 if (addr < first_addr) { 1132 b1 = get_addressed_line_node(p); 1133 b2 = get_addressed_line_node(addr); 1134 /* this get_addressed_line_node last! */ 1135 } else { 1136 b2 = get_addressed_line_node(addr); 1137 b1 = get_addressed_line_node(p); 1138 /* this get_addressed_line_node last! */ 1139 } 1140 a2 = b2->q_forw; 1141 REQUE(b2, b1->q_forw); 1142 REQUE(a1->q_back, a2); 1143 REQUE(b1, a1); 1144 current_addr = addr + ((addr < first_addr) ? 1145 second_addr - first_addr + 1 : 0); 1146 } 1147 if (isglobal) 1148 unset_active_nodes(b2->q_forw, a2); 1149 modified = 1; 1150 SPL0(); 1151 return 0; 1152 } 1153 1154 1155 /* copy_lines: copy a range of lines; return status */ 1156 int 1157 copy_lines(long addr) 1158 { 1159 line_t *lp, *np = get_addressed_line_node(first_addr); 1160 undo_t *up = NULL; 1161 long n = second_addr - first_addr + 1; 1162 long m = 0; 1163 1164 current_addr = addr; 1165 if (first_addr <= addr && addr < second_addr) { 1166 n = addr - first_addr + 1; 1167 m = second_addr - addr; 1168 } 1169 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1170 for (; n-- > 0; np = np->q_forw) { 1171 SPL1(); 1172 if ((lp = dup_line_node(np)) == NULL) { 1173 SPL0(); 1174 return ERR; 1175 } 1176 add_line_node(lp); 1177 if (up) 1178 up->t = lp; 1179 else if ((up = push_undo_stack(UADD, current_addr, 1180 current_addr)) == NULL) { 1181 SPL0(); 1182 return ERR; 1183 } 1184 modified = 1; 1185 SPL0(); 1186 } 1187 return 0; 1188 } 1189 1190 1191 /* delete_lines: delete a range of lines */ 1192 int 1193 delete_lines(long from, long to) 1194 { 1195 line_t *n, *p; 1196 1197 SPL1(); 1198 if (push_undo_stack(UDEL, from, to) == NULL) { 1199 SPL0(); 1200 return ERR; 1201 } 1202 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1203 p = get_addressed_line_node(from - 1); 1204 /* this get_addressed_line_node last! */ 1205 if (isglobal) 1206 unset_active_nodes(p->q_forw, n); 1207 REQUE(p, n); 1208 addr_last -= to - from + 1; 1209 current_addr = from - 1; 1210 modified = 1; 1211 SPL0(); 1212 return 0; 1213 } 1214 1215 1216 /* display_lines: print a range of lines to stdout */ 1217 int 1218 display_lines(long from, long to, int gflag) 1219 { 1220 line_t *bp; 1221 line_t *ep; 1222 char *s; 1223 1224 if (!from) { 1225 sprintf(errmsg, "invalid address"); 1226 return ERR; 1227 } 1228 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1229 bp = get_addressed_line_node(from); 1230 for (; bp != ep; bp = bp->q_forw) { 1231 if ((s = get_sbuf_line(bp)) == NULL) 1232 return ERR; 1233 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1234 return ERR; 1235 } 1236 return 0; 1237 } 1238 1239 1240 #define MAXMARK 26 /* max number of marks */ 1241 1242 line_t *mark[MAXMARK]; /* line markers */ 1243 int markno; /* line marker count */ 1244 1245 /* mark_line_node: set a line node mark */ 1246 int 1247 mark_line_node(line_t *lp, int n) 1248 { 1249 if (!islower((unsigned char)n)) { 1250 sprintf(errmsg, "invalid mark character"); 1251 return ERR; 1252 } else if (mark[n - 'a'] == NULL) 1253 markno++; 1254 mark[n - 'a'] = lp; 1255 return 0; 1256 } 1257 1258 1259 /* get_marked_node_addr: return address of a marked line */ 1260 long 1261 get_marked_node_addr(int n) 1262 { 1263 if (!islower((unsigned char)n)) { 1264 sprintf(errmsg, "invalid mark character"); 1265 return ERR; 1266 } 1267 return get_line_node_addr(mark[n - 'a']); 1268 } 1269 1270 1271 /* unmark_line_node: clear line node mark */ 1272 void 1273 unmark_line_node(line_t *lp) 1274 { 1275 int i; 1276 1277 for (i = 0; markno && i < MAXMARK; i++) 1278 if (mark[i] == lp) { 1279 mark[i] = NULL; 1280 markno--; 1281 } 1282 } 1283 1284 1285 /* dup_line_node: return a pointer to a copy of a line node */ 1286 line_t * 1287 dup_line_node(line_t *lp) 1288 { 1289 line_t *np; 1290 1291 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1292 fprintf(stderr, "%s\n", strerror(errno)); 1293 sprintf(errmsg, "out of memory"); 1294 return NULL; 1295 } 1296 np->seek = lp->seek; 1297 np->len = lp->len; 1298 return np; 1299 } 1300 1301 1302 /* has_trailing_escape: return the parity of escapes preceding a character 1303 in a string */ 1304 int 1305 has_trailing_escape(char *s, char *t) 1306 { 1307 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1308 } 1309 1310 1311 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */ 1312 char * 1313 strip_escapes(const char *s) 1314 { 1315 static char *file = NULL; 1316 static int filesz = 0; 1317 1318 int i = 0; 1319 1320 REALLOC(file, filesz, PATH_MAX, NULL); 1321 while (i < filesz - 1 /* Worry about a possible trailing escape */ 1322 && (file[i++] = (*s == '\\') ? *++s : *s)) 1323 s++; 1324 return file; 1325 } 1326 1327 1328 void 1329 signal_hup(int signo) 1330 { 1331 if (mutex) 1332 sigflags |= (1 << (signo - 1)); 1333 else 1334 handle_hup(signo); 1335 } 1336 1337 1338 void 1339 signal_int(int signo) 1340 { 1341 if (mutex) 1342 sigflags |= (1 << (signo - 1)); 1343 else 1344 handle_int(signo); 1345 } 1346 1347 1348 void 1349 handle_hup(int signo) 1350 { 1351 char *hup = NULL; /* hup filename */ 1352 char *s; 1353 int n; 1354 1355 if (!sigactive) 1356 quit(1); 1357 sigflags &= ~(1 << (signo - 1)); 1358 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1359 (s = getenv("HOME")) != NULL && 1360 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */ 1361 (hup = (char *) malloc(n + 10)) != NULL) { 1362 strcpy(hup, s); 1363 if (hup[n - 1] != '/') 1364 hup[n] = '/', hup[n+1] = '\0'; 1365 strcat(hup, "ed.hup"); 1366 write_file(hup, "w", 1, addr_last); 1367 } 1368 quit(2); 1369 } 1370 1371 1372 void 1373 handle_int(int signo) 1374 { 1375 if (!sigactive) 1376 quit(1); 1377 sigflags &= ~(1 << (signo - 1)); 1378 #ifdef _POSIX_SOURCE 1379 siglongjmp(env, -1); 1380 #else 1381 longjmp(env, -1); 1382 #endif 1383 } 1384 1385 1386 int cols = 72; /* wrap column */ 1387 1388 void 1389 handle_winch(int signo) 1390 { 1391 int save_errno = errno; 1392 1393 struct winsize ws; /* window size structure */ 1394 1395 sigflags &= ~(1 << (signo - 1)); 1396 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1397 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1398 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1399 } 1400 errno = save_errno; 1401 } 1402 1403 1404 /* is_legal_filename: return a legal filename */ 1405 int 1406 is_legal_filename(char *s) 1407 { 1408 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1409 sprintf(errmsg, "shell access restricted"); 1410 return 0; 1411 } 1412 return 1; 1413 } 1414