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 * $Id$ 29 */ 30 31 #ifndef lint 32 static char * const copyright = 33 "@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\ 34 All rights reserved.\n"; 35 #endif /* not lint */ 36 37 #ifndef lint 38 static char * const rcsid = "@(#)main.c,v 1.1 1994/02/01 00:34:42 alm Exp"; 39 #endif /* not lint */ 40 41 /* 42 * CREDITS 43 * 44 * This program is based on the editor algorithm described in 45 * Brian W. Kernighan and P. J. Plauger's book "Software Tools 46 * in Pascal," Addison-Wesley, 1981. 47 * 48 * The buffering algorithm is attributed to Rodney Ruddock of 49 * the University of Guelph, Guelph, Ontario. 50 * 51 * The cbc.c encryption code is adapted from 52 * the bdes program by Matt Bishop of Dartmouth College, 53 * Hanover, NH. 54 * 55 */ 56 57 #include <sys/ioctl.h> 58 #include <sys/wait.h> 59 #include <ctype.h> 60 #include <setjmp.h> 61 #include <pwd.h> 62 #include <locale.h> 63 64 #include "ed.h" 65 66 67 #ifdef _POSIX_SOURCE 68 sigjmp_buf env; 69 #else 70 jmp_buf env; 71 #endif 72 73 /* static buffers */ 74 char stdinbuf[1]; /* stdin buffer */ 75 char *shcmd; /* shell command buffer */ 76 int shcmdsz; /* shell command buffer size */ 77 int shcmdi; /* shell command buffer index */ 78 char *ibuf; /* ed command-line buffer */ 79 int ibufsz; /* ed command-line buffer size */ 80 char *ibufp; /* pointer to ed command-line buffer */ 81 82 /* global flags */ 83 int des = 0; /* if set, use crypt(3) for i/o */ 84 int garrulous = 0; /* if set, print all error messages */ 85 int isbinary; /* if set, buffer contains ASCII NULs */ 86 int isglobal; /* if set, doing a global command */ 87 int modified; /* if set, buffer modified since last write */ 88 int mutex = 0; /* if set, signals set "sigflags" */ 89 int red = 0; /* if set, restrict shell/directory access */ 90 int scripted = 0; /* if set, suppress diagnostics */ 91 int sigflags = 0; /* if set, signals received while mutex set */ 92 int sigactive = 0; /* if set, signal handlers are enabled */ 93 94 char old_filename[MAXPATHLEN + 1] = ""; /* default filename */ 95 long current_addr; /* current address in editor buffer */ 96 long addr_last; /* last address in editor buffer */ 97 int lineno; /* script line number */ 98 char *prompt; /* command-line prompt */ 99 char *dps = "*"; /* default command-line prompt */ 100 101 char *usage = "usage: %s [-] [-sx] [-p string] [name]\n"; 102 103 extern char errmsg[]; 104 extern int optind; 105 extern char *optarg; 106 107 /* ed: line editor */ 108 int 109 main(argc, argv) 110 int argc; 111 char **argv; 112 { 113 int c, n; 114 long status = 0; 115 #if __GNUC__ 116 /* Avoid longjmp clobbering */ 117 (void) &argc; 118 (void) &argv; 119 #endif 120 121 (void)setlocale(LC_ALL, ""); 122 123 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 124 top: 125 while ((c = getopt(argc, argv, "p:sx")) != EOF) 126 switch(c) { 127 case 'p': /* set prompt */ 128 prompt = optarg; 129 break; 130 case 's': /* run script */ 131 scripted = 1; 132 break; 133 case 'x': /* use crypt */ 134 #ifdef DES 135 des = get_keyword(); 136 #else 137 fprintf(stderr, "crypt unavailable\n?\n"); 138 #endif 139 break; 140 141 default: 142 fprintf(stderr, usage, argv[0]); 143 exit(1); 144 } 145 argv += optind; 146 argc -= optind; 147 if (argc && **argv == '-') { 148 scripted = 1; 149 if (argc > 1) { 150 optind = 1; 151 goto top; 152 } 153 argv++; 154 argc--; 155 } 156 /* assert: reliable signals! */ 157 #ifdef SIGWINCH 158 handle_winch(SIGWINCH); 159 if (isatty(0)) signal(SIGWINCH, handle_winch); 160 #endif 161 signal(SIGHUP, signal_hup); 162 signal(SIGQUIT, SIG_IGN); 163 signal(SIGINT, signal_int); 164 #ifdef _POSIX_SOURCE 165 if ((status = sigsetjmp(env, 1))) 166 #else 167 if ((status = setjmp(env))) 168 #endif 169 { 170 fputs("\n?\n", stderr); 171 sprintf(errmsg, "interrupt"); 172 } else { 173 init_buffers(); 174 sigactive = 1; /* enable signal handlers */ 175 if (argc && **argv && is_legal_filename(*argv)) { 176 if (read_file(*argv, 0) < 0 && !isatty(0)) 177 quit(2); 178 else if (**argv != '!') 179 strcpy(old_filename, *argv); 180 } else if (argc) { 181 fputs("?\n", stderr); 182 if (**argv == '\0') 183 sprintf(errmsg, "invalid filename"); 184 if (!isatty(0)) 185 quit(2); 186 } 187 } 188 for (;;) { 189 if (status < 0 && garrulous) 190 fprintf(stderr, "%s\n", errmsg); 191 if (prompt) { 192 printf("%s", prompt); 193 fflush(stdout); 194 } 195 if ((n = get_tty_line()) < 0) { 196 status = ERR; 197 continue; 198 } else if (n == 0) { 199 if (modified && !scripted) { 200 fputs("?\n", stderr); 201 sprintf(errmsg, "warning: file modified"); 202 if (!isatty(0)) { 203 fprintf(stderr, garrulous ? 204 "script, line %d: %s\n" : 205 "", lineno, errmsg); 206 quit(2); 207 } 208 clearerr(stdin); 209 modified = 0; 210 status = EMOD; 211 continue; 212 } else 213 quit(0); 214 } else if (ibuf[n - 1] != '\n') { 215 /* discard line */ 216 sprintf(errmsg, "unexpected end-of-file"); 217 clearerr(stdin); 218 status = ERR; 219 continue; 220 } 221 isglobal = 0; 222 if ((status = extract_addr_range()) >= 0 && 223 (status = exec_command()) >= 0) 224 if (!status || 225 (status = display_lines(current_addr, current_addr, 226 status)) >= 0) 227 continue; 228 switch (status) { 229 case EOF: 230 quit(0); 231 case EMOD: 232 modified = 0; 233 fputs("?\n", stderr); /* give warning */ 234 sprintf(errmsg, "warning: file modified"); 235 if (!isatty(0)) { 236 fprintf(stderr, garrulous ? 237 "script, line %d: %s\n" : 238 "", lineno, errmsg); 239 quit(2); 240 } 241 break; 242 case FATAL: 243 if (!isatty(0)) 244 fprintf(stderr, garrulous ? 245 "script, line %d: %s\n" : "", 246 lineno, errmsg); 247 else 248 fprintf(stderr, garrulous ? "%s\n" : "", 249 errmsg); 250 quit(3); 251 default: 252 fputs("?\n", stderr); 253 if (!isatty(0)) { 254 fprintf(stderr, garrulous ? 255 "script, line %d: %s\n" : "", 256 lineno, errmsg); 257 quit(2); 258 } 259 break; 260 } 261 } 262 /*NOTREACHED*/ 263 } 264 265 long first_addr, second_addr, addr_cnt; 266 267 /* extract_addr_range: get line addresses from the command buffer until an 268 illegal address is seen; return status */ 269 int 270 extract_addr_range() 271 { 272 long addr; 273 274 addr_cnt = 0; 275 first_addr = second_addr = current_addr; 276 while ((addr = next_addr()) >= 0) { 277 addr_cnt++; 278 first_addr = second_addr; 279 second_addr = addr; 280 if (*ibufp != ',' && *ibufp != ';') 281 break; 282 else if (*ibufp++ == ';') 283 current_addr = addr; 284 } 285 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 286 first_addr = second_addr; 287 return (addr == ERR) ? ERR : 0; 288 } 289 290 291 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++ 292 293 #define MUST_BE_FIRST() \ 294 if (!first) { sprintf(errmsg, "invalid address"); return ERR; } 295 296 /* next_addr: return the next line address in the command buffer */ 297 long 298 next_addr() 299 { 300 char *hd; 301 long addr = current_addr; 302 long n; 303 int first = 1; 304 int c; 305 306 SKIP_BLANKS(); 307 for (hd = ibufp;; first = 0) 308 switch (c = *ibufp) { 309 case '+': 310 case '\t': 311 case ' ': 312 case '-': 313 case '^': 314 ibufp++; 315 SKIP_BLANKS(); 316 if (isdigit((unsigned char)*ibufp)) { 317 STRTOL(n, ibufp); 318 addr += (c == '-' || c == '^') ? -n : n; 319 } else if (!isspace((unsigned char)c)) 320 addr += (c == '-' || c == '^') ? -1 : 1; 321 break; 322 case '0': case '1': case '2': 323 case '3': case '4': case '5': 324 case '6': case '7': case '8': case '9': 325 MUST_BE_FIRST(); 326 STRTOL(addr, ibufp); 327 break; 328 case '.': 329 case '$': 330 MUST_BE_FIRST(); 331 ibufp++; 332 addr = (c == '.') ? current_addr : addr_last; 333 break; 334 case '/': 335 case '?': 336 MUST_BE_FIRST(); 337 if ((addr = get_matching_node_addr( 338 get_compiled_pattern(), c == '/')) < 0) 339 return ERR; 340 else if (c == *ibufp) 341 ibufp++; 342 break; 343 case '\'': 344 MUST_BE_FIRST(); 345 ibufp++; 346 if ((addr = get_marked_node_addr(*ibufp++)) < 0) 347 return ERR; 348 break; 349 case '%': 350 case ',': 351 case ';': 352 if (first) { 353 ibufp++; 354 addr_cnt++; 355 second_addr = (c == ';') ? current_addr : 1; 356 addr = addr_last; 357 break; 358 } 359 /* FALL THROUGH */ 360 default: 361 if (ibufp == hd) 362 return EOF; 363 else if (addr < 0 || addr_last < addr) { 364 sprintf(errmsg, "invalid address"); 365 return ERR; 366 } else 367 return addr; 368 } 369 /* NOTREACHED */ 370 } 371 372 373 #ifdef BACKWARDS 374 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 375 #define GET_THIRD_ADDR(addr) \ 376 { \ 377 long ol1, ol2; \ 378 \ 379 ol1 = first_addr, ol2 = second_addr; \ 380 if (extract_addr_range() < 0) \ 381 return ERR; \ 382 else if (addr_cnt == 0) { \ 383 sprintf(errmsg, "destination expected"); \ 384 return ERR; \ 385 } else if (second_addr < 0 || addr_last < second_addr) { \ 386 sprintf(errmsg, "invalid address"); \ 387 return ERR; \ 388 } \ 389 addr = second_addr; \ 390 first_addr = ol1, second_addr = ol2; \ 391 } 392 #else /* BACKWARDS */ 393 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 394 #define GET_THIRD_ADDR(addr) \ 395 { \ 396 long ol1, ol2; \ 397 \ 398 ol1 = first_addr, ol2 = second_addr; \ 399 if (extract_addr_range() < 0) \ 400 return ERR; \ 401 if (second_addr < 0 || addr_last < second_addr) { \ 402 sprintf(errmsg, "invalid address"); \ 403 return ERR; \ 404 } \ 405 addr = second_addr; \ 406 first_addr = ol1, second_addr = ol2; \ 407 } 408 #endif 409 410 411 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 412 #define GET_COMMAND_SUFFIX() { \ 413 int done = 0; \ 414 do { \ 415 switch(*ibufp) { \ 416 case 'p': \ 417 gflag |= GPR, ibufp++; \ 418 break; \ 419 case 'l': \ 420 gflag |= GLS, ibufp++; \ 421 break; \ 422 case 'n': \ 423 gflag |= GNP, ibufp++; \ 424 break; \ 425 default: \ 426 done++; \ 427 } \ 428 } while (!done); \ 429 if (*ibufp++ != '\n') { \ 430 sprintf(errmsg, "invalid command suffix"); \ 431 return ERR; \ 432 } \ 433 } 434 435 436 /* sflags */ 437 #define SGG 001 /* complement previous global substitute suffix */ 438 #define SGP 002 /* complement previous print suffix */ 439 #define SGR 004 /* use last regex instead of last pat */ 440 #define SGF 010 /* repeat last substitution */ 441 442 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 443 444 long rows = 22; /* scroll length: ws_row - 2 */ 445 446 /* exec_command: execute the next command in command buffer; return print 447 request, if any */ 448 int 449 exec_command() 450 { 451 extern long u_current_addr; 452 extern long u_addr_last; 453 454 static pattern_t *pat = NULL; 455 static int sgflag = 0; 456 static int sgnum = 0; 457 458 pattern_t *tpat; 459 char *fnp; 460 int gflag = 0; 461 int sflags = 0; 462 long addr = 0; 463 int n = 0; 464 int c; 465 466 SKIP_BLANKS(); 467 switch(c = *ibufp++) { 468 case 'a': 469 GET_COMMAND_SUFFIX(); 470 if (!isglobal) clear_undo_stack(); 471 if (append_lines(second_addr) < 0) 472 return ERR; 473 break; 474 case 'c': 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 append_lines(current_addr) < 0) 481 return ERR; 482 break; 483 case 'd': 484 if (check_addr_range(current_addr, current_addr) < 0) 485 return ERR; 486 GET_COMMAND_SUFFIX(); 487 if (!isglobal) clear_undo_stack(); 488 if (delete_lines(first_addr, second_addr) < 0) 489 return ERR; 490 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 491 current_addr = addr; 492 break; 493 case 'e': 494 if (modified && !scripted) 495 return EMOD; 496 /* fall through */ 497 case 'E': 498 if (addr_cnt > 0) { 499 sprintf(errmsg, "unexpected address"); 500 return ERR; 501 } else if (!isspace((unsigned char)*ibufp)) { 502 sprintf(errmsg, "unexpected command suffix"); 503 return ERR; 504 } else if ((fnp = get_filename()) == NULL) 505 return ERR; 506 GET_COMMAND_SUFFIX(); 507 if (delete_lines(1, addr_last) < 0) 508 return ERR; 509 clear_undo_stack(); 510 if (close_sbuf() < 0) 511 return ERR; 512 else if (open_sbuf() < 0) 513 return FATAL; 514 if (*fnp && *fnp != '!') strcpy(old_filename, fnp); 515 #ifdef BACKWARDS 516 if (*fnp == '\0' && *old_filename == '\0') { 517 sprintf(errmsg, "no current filename"); 518 return ERR; 519 } 520 #endif 521 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 522 return ERR; 523 clear_undo_stack(); 524 modified = 0; 525 u_current_addr = u_addr_last = -1; 526 break; 527 case 'f': 528 if (addr_cnt > 0) { 529 sprintf(errmsg, "unexpected address"); 530 return ERR; 531 } else if (!isspace((unsigned char)*ibufp)) { 532 sprintf(errmsg, "unexpected command suffix"); 533 return ERR; 534 } else if ((fnp = get_filename()) == NULL) 535 return ERR; 536 else if (*fnp == '!') { 537 sprintf(errmsg, "invalid redirection"); 538 return ERR; 539 } 540 GET_COMMAND_SUFFIX(); 541 if (*fnp) strcpy(old_filename, fnp); 542 printf("%s\n", strip_escapes(old_filename)); 543 break; 544 case 'g': 545 case 'v': 546 case 'G': 547 case 'V': 548 if (isglobal) { 549 sprintf(errmsg, "cannot nest global commands"); 550 return ERR; 551 } else if (check_addr_range(1, addr_last) < 0) 552 return ERR; 553 else if (build_active_list(c == 'g' || c == 'G') < 0) 554 return ERR; 555 else if ((n = (c == 'G' || c == 'V'))) 556 GET_COMMAND_SUFFIX(); 557 isglobal++; 558 if (exec_global(n, gflag) < 0) 559 return ERR; 560 break; 561 case 'h': 562 if (addr_cnt > 0) { 563 sprintf(errmsg, "unexpected address"); 564 return ERR; 565 } 566 GET_COMMAND_SUFFIX(); 567 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 568 break; 569 case 'H': 570 if (addr_cnt > 0) { 571 sprintf(errmsg, "unexpected address"); 572 return ERR; 573 } 574 GET_COMMAND_SUFFIX(); 575 if ((garrulous = 1 - garrulous) && *errmsg) 576 fprintf(stderr, "%s\n", errmsg); 577 break; 578 case 'i': 579 if (second_addr == 0) { 580 sprintf(errmsg, "invalid address"); 581 return ERR; 582 } 583 GET_COMMAND_SUFFIX(); 584 if (!isglobal) clear_undo_stack(); 585 if (append_lines(second_addr - 1) < 0) 586 return ERR; 587 break; 588 case 'j': 589 if (check_addr_range(current_addr, current_addr + 1) < 0) 590 return ERR; 591 GET_COMMAND_SUFFIX(); 592 if (!isglobal) clear_undo_stack(); 593 if (first_addr != second_addr && 594 join_lines(first_addr, second_addr) < 0) 595 return ERR; 596 break; 597 case 'k': 598 c = *ibufp++; 599 if (second_addr == 0) { 600 sprintf(errmsg, "invalid address"); 601 return ERR; 602 } 603 GET_COMMAND_SUFFIX(); 604 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 605 return ERR; 606 break; 607 case 'l': 608 if (check_addr_range(current_addr, current_addr) < 0) 609 return ERR; 610 GET_COMMAND_SUFFIX(); 611 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 612 return ERR; 613 gflag = 0; 614 break; 615 case 'm': 616 if (check_addr_range(current_addr, current_addr) < 0) 617 return ERR; 618 GET_THIRD_ADDR(addr); 619 if (first_addr <= addr && addr < second_addr) { 620 sprintf(errmsg, "invalid destination"); 621 return ERR; 622 } 623 GET_COMMAND_SUFFIX(); 624 if (!isglobal) clear_undo_stack(); 625 if (move_lines(addr) < 0) 626 return ERR; 627 break; 628 case 'n': 629 if (check_addr_range(current_addr, current_addr) < 0) 630 return ERR; 631 GET_COMMAND_SUFFIX(); 632 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 633 return ERR; 634 gflag = 0; 635 break; 636 case 'p': 637 if (check_addr_range(current_addr, current_addr) < 0) 638 return ERR; 639 GET_COMMAND_SUFFIX(); 640 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 641 return ERR; 642 gflag = 0; 643 break; 644 case 'P': 645 if (addr_cnt > 0) { 646 sprintf(errmsg, "unexpected address"); 647 return ERR; 648 } 649 GET_COMMAND_SUFFIX(); 650 prompt = prompt ? NULL : optarg ? optarg : dps; 651 break; 652 case 'q': 653 case 'Q': 654 if (addr_cnt > 0) { 655 sprintf(errmsg, "unexpected address"); 656 return ERR; 657 } 658 GET_COMMAND_SUFFIX(); 659 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 660 break; 661 case 'r': 662 if (!isspace((unsigned char)*ibufp)) { 663 sprintf(errmsg, "unexpected command suffix"); 664 return ERR; 665 } else if (addr_cnt == 0) 666 second_addr = addr_last; 667 if ((fnp = get_filename()) == NULL) 668 return ERR; 669 GET_COMMAND_SUFFIX(); 670 if (!isglobal) clear_undo_stack(); 671 if (*old_filename == '\0' && *fnp != '!') 672 strcpy(old_filename, fnp); 673 #ifdef BACKWARDS 674 if (*fnp == '\0' && *old_filename == '\0') { 675 sprintf(errmsg, "no current filename"); 676 return ERR; 677 } 678 #endif 679 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 680 return ERR; 681 else if (addr && addr != addr_last) 682 modified = 1; 683 break; 684 case 's': 685 do { 686 switch(*ibufp) { 687 case '\n': 688 sflags |=SGF; 689 break; 690 case 'g': 691 sflags |= SGG; 692 ibufp++; 693 break; 694 case 'p': 695 sflags |= SGP; 696 ibufp++; 697 break; 698 case 'r': 699 sflags |= SGR; 700 ibufp++; 701 break; 702 case '0': case '1': case '2': case '3': case '4': 703 case '5': case '6': case '7': case '8': case '9': 704 STRTOL(sgnum, ibufp); 705 sflags |= SGF; 706 sgflag &= ~GSG; /* override GSG */ 707 break; 708 default: 709 if (sflags) { 710 sprintf(errmsg, "invalid command suffix"); 711 return ERR; 712 } 713 } 714 } while (sflags && *ibufp != '\n'); 715 if (sflags && !pat) { 716 sprintf(errmsg, "no previous substitution"); 717 return ERR; 718 } else if (sflags & SGG) 719 sgnum = 0; /* override numeric arg */ 720 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 721 sprintf(errmsg, "invalid pattern delimiter"); 722 return ERR; 723 } 724 tpat = pat; 725 SPL1(); 726 if ((!sflags || (sflags & SGR)) && 727 (tpat = get_compiled_pattern()) == NULL) { 728 SPL0(); 729 return ERR; 730 } else if (tpat != pat) { 731 if (pat) { 732 regfree(pat); 733 free(pat); 734 } 735 pat = tpat; 736 patlock = 1; /* reserve pattern */ 737 } 738 SPL0(); 739 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 740 return ERR; 741 else if (isglobal) 742 sgflag |= GLB; 743 else 744 sgflag &= ~GLB; 745 if (sflags & SGG) 746 sgflag ^= GSG; 747 if (sflags & SGP) 748 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 749 do { 750 switch(*ibufp) { 751 case 'p': 752 sgflag |= GPR, ibufp++; 753 break; 754 case 'l': 755 sgflag |= GLS, ibufp++; 756 break; 757 case 'n': 758 sgflag |= GNP, ibufp++; 759 break; 760 default: 761 n++; 762 } 763 } while (!n); 764 if (check_addr_range(current_addr, current_addr) < 0) 765 return ERR; 766 GET_COMMAND_SUFFIX(); 767 if (!isglobal) clear_undo_stack(); 768 if (search_and_replace(pat, sgflag, sgnum) < 0) 769 return ERR; 770 break; 771 case 't': 772 if (check_addr_range(current_addr, current_addr) < 0) 773 return ERR; 774 GET_THIRD_ADDR(addr); 775 GET_COMMAND_SUFFIX(); 776 if (!isglobal) clear_undo_stack(); 777 if (copy_lines(addr) < 0) 778 return ERR; 779 break; 780 case 'u': 781 if (addr_cnt > 0) { 782 sprintf(errmsg, "unexpected address"); 783 return ERR; 784 } 785 GET_COMMAND_SUFFIX(); 786 if (pop_undo_stack() < 0) 787 return ERR; 788 break; 789 case 'w': 790 case 'W': 791 if ((n = *ibufp) == 'q' || n == 'Q') { 792 gflag = EOF; 793 ibufp++; 794 } 795 if (!isspace((unsigned char)*ibufp)) { 796 sprintf(errmsg, "unexpected command suffix"); 797 return ERR; 798 } else if ((fnp = get_filename()) == NULL) 799 return ERR; 800 if (addr_cnt == 0 && !addr_last) 801 first_addr = second_addr = 0; 802 else if (check_addr_range(1, addr_last) < 0) 803 return ERR; 804 GET_COMMAND_SUFFIX(); 805 if (*old_filename == '\0' && *fnp != '!') 806 strcpy(old_filename, fnp); 807 #ifdef BACKWARDS 808 if (*fnp == '\0' && *old_filename == '\0') { 809 sprintf(errmsg, "no current filename"); 810 return ERR; 811 } 812 #endif 813 if ((addr = write_file(*fnp ? fnp : old_filename, 814 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 815 return ERR; 816 else if (addr == addr_last) 817 modified = 0; 818 else if (modified && !scripted && n == 'q') 819 gflag = EMOD; 820 break; 821 case 'x': 822 if (addr_cnt > 0) { 823 sprintf(errmsg, "unexpected address"); 824 return ERR; 825 } 826 GET_COMMAND_SUFFIX(); 827 #ifdef DES 828 des = get_keyword(); 829 #else 830 sprintf(errmsg, "crypt unavailable"); 831 return ERR; 832 #endif 833 break; 834 case 'z': 835 #ifdef BACKWARDS 836 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 837 #else 838 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 839 #endif 840 return ERR; 841 else if ('0' < *ibufp && *ibufp <= '9') 842 STRTOL(rows, ibufp); 843 GET_COMMAND_SUFFIX(); 844 if (display_lines(second_addr, min(addr_last, 845 second_addr + rows), gflag) < 0) 846 return ERR; 847 gflag = 0; 848 break; 849 case '=': 850 GET_COMMAND_SUFFIX(); 851 printf("%ld\n", addr_cnt ? second_addr : addr_last); 852 break; 853 case '!': 854 if (addr_cnt > 0) { 855 sprintf(errmsg, "unexpected address"); 856 return ERR; 857 } else if ((sflags = get_shell_command()) < 0) 858 return ERR; 859 GET_COMMAND_SUFFIX(); 860 if (sflags) printf("%s\n", shcmd + 1); 861 system(shcmd + 1); 862 if (!scripted) printf("!\n"); 863 break; 864 case '\n': 865 #ifdef BACKWARDS 866 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 867 #else 868 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 869 #endif 870 || display_lines(second_addr, second_addr, 0) < 0) 871 return ERR; 872 break; 873 default: 874 sprintf(errmsg, "unknown command"); 875 return ERR; 876 } 877 return gflag; 878 } 879 880 881 /* check_addr_range: return status of address range check */ 882 int 883 check_addr_range(n, m) 884 long n, m; 885 { 886 if (addr_cnt == 0) { 887 first_addr = n; 888 second_addr = m; 889 } 890 if (first_addr > second_addr || 1 > first_addr || 891 second_addr > addr_last) { 892 sprintf(errmsg, "invalid address"); 893 return ERR; 894 } 895 return 0; 896 } 897 898 899 /* get_matching_node_addr: return the address of the next line matching a 900 pattern in a given direction. wrap around begin/end of editor buffer if 901 necessary */ 902 long 903 get_matching_node_addr(pat, dir) 904 pattern_t *pat; 905 int dir; 906 { 907 char *s; 908 long n = current_addr; 909 line_t *lp; 910 911 if (!pat) return ERR; 912 do { 913 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { 914 lp = get_addressed_line_node(n); 915 if ((s = get_sbuf_line(lp)) == NULL) 916 return ERR; 917 if (isbinary) 918 NUL_TO_NEWLINE(s, lp->len); 919 if (!regexec(pat, s, 0, NULL, 0)) 920 return n; 921 } 922 } while (n != current_addr); 923 sprintf(errmsg, "no match"); 924 return ERR; 925 } 926 927 928 /* get_filename: return pointer to copy of filename in the command buffer */ 929 char * 930 get_filename() 931 { 932 static char *file = NULL; 933 static int filesz = 0; 934 935 int n; 936 937 if (*ibufp != '\n') { 938 SKIP_BLANKS(); 939 if (*ibufp == '\n') { 940 sprintf(errmsg, "invalid filename"); 941 return NULL; 942 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 943 return NULL; 944 else if (*ibufp == '!') { 945 ibufp++; 946 if ((n = get_shell_command()) < 0) 947 return NULL; 948 if (n) printf("%s\n", shcmd + 1); 949 return shcmd; 950 } else if (n - 1 > MAXPATHLEN) { 951 sprintf(errmsg, "filename too long"); 952 return NULL; 953 } 954 } 955 #ifndef BACKWARDS 956 else if (*old_filename == '\0') { 957 sprintf(errmsg, "no current filename"); 958 return NULL; 959 } 960 #endif 961 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 962 for (n = 0; *ibufp != '\n';) 963 file[n++] = *ibufp++; 964 file[n] = '\0'; 965 return is_legal_filename(file) ? file : NULL; 966 } 967 968 969 /* get_shell_command: read a shell command from stdin; return substitution 970 status */ 971 int 972 get_shell_command() 973 { 974 static char *buf = NULL; 975 static int n = 0; 976 977 char *s; /* substitution char pointer */ 978 int i = 0; 979 int j = 0; 980 981 if (red) { 982 sprintf(errmsg, "shell access restricted"); 983 return ERR; 984 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 985 return ERR; 986 REALLOC(buf, n, j + 1, ERR); 987 buf[i++] = '!'; /* prefix command w/ bang */ 988 while (*ibufp != '\n') 989 switch (*ibufp) { 990 default: 991 REALLOC(buf, n, i + 2, ERR); 992 buf[i++] = *ibufp; 993 if (*ibufp++ == '\\') 994 buf[i++] = *ibufp++; 995 break; 996 case '!': 997 if (s != ibufp) { 998 REALLOC(buf, n, i + 1, ERR); 999 buf[i++] = *ibufp++; 1000 } 1001 #ifdef BACKWARDS 1002 else if (shcmd == NULL || *(shcmd + 1) == '\0') 1003 #else 1004 else if (shcmd == NULL) 1005 #endif 1006 { 1007 sprintf(errmsg, "no previous command"); 1008 return ERR; 1009 } else { 1010 REALLOC(buf, n, i + shcmdi, ERR); 1011 for (s = shcmd + 1; s < shcmd + shcmdi;) 1012 buf[i++] = *s++; 1013 s = ibufp++; 1014 } 1015 break; 1016 case '%': 1017 if (*old_filename == '\0') { 1018 sprintf(errmsg, "no current filename"); 1019 return ERR; 1020 } 1021 j = strlen(s = strip_escapes(old_filename)); 1022 REALLOC(buf, n, i + j, ERR); 1023 while (j--) 1024 buf[i++] = *s++; 1025 s = ibufp++; 1026 break; 1027 } 1028 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1029 memcpy(shcmd, buf, i); 1030 shcmd[shcmdi = i] = '\0'; 1031 return *s == '!' || *s == '%'; 1032 } 1033 1034 1035 /* append_lines: insert text from stdin to after line n; stop when either a 1036 single period is read or EOF; return status */ 1037 int 1038 append_lines(n) 1039 long n; 1040 { 1041 int l; 1042 char *lp = ibuf; 1043 char *eot; 1044 undo_t *up = NULL; 1045 1046 for (current_addr = n;;) { 1047 if (!isglobal) { 1048 if ((l = get_tty_line()) < 0) 1049 return ERR; 1050 else if (l == 0 || ibuf[l - 1] != '\n') { 1051 clearerr(stdin); 1052 return l ? EOF : 0; 1053 } 1054 lp = ibuf; 1055 } else if (*(lp = ibufp) == '\0') 1056 return 0; 1057 else { 1058 while (*ibufp++ != '\n') 1059 ; 1060 l = ibufp - lp; 1061 } 1062 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1063 return 0; 1064 } 1065 eot = lp + l; 1066 SPL1(); 1067 do { 1068 if ((lp = put_sbuf_line(lp)) == NULL) { 1069 SPL0(); 1070 return ERR; 1071 } else if (up) 1072 up->t = get_addressed_line_node(current_addr); 1073 else if ((up = push_undo_stack(UADD, current_addr, 1074 current_addr)) == NULL) { 1075 SPL0(); 1076 return ERR; 1077 } 1078 } while (lp != eot); 1079 modified = 1; 1080 SPL0(); 1081 } 1082 /* NOTREACHED */ 1083 } 1084 1085 1086 /* join_lines: replace a range of lines with the joined text of those lines */ 1087 int 1088 join_lines(from, to) 1089 long from; 1090 long to; 1091 { 1092 static char *buf = NULL; 1093 static int n; 1094 1095 char *s; 1096 int size = 0; 1097 line_t *bp, *ep; 1098 1099 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1100 bp = get_addressed_line_node(from); 1101 for (; bp != ep; bp = bp->q_forw) { 1102 if ((s = get_sbuf_line(bp)) == NULL) 1103 return ERR; 1104 REALLOC(buf, n, size + bp->len, ERR); 1105 memcpy(buf + size, s, bp->len); 1106 size += bp->len; 1107 } 1108 REALLOC(buf, n, size + 2, ERR); 1109 memcpy(buf + size, "\n", 2); 1110 if (delete_lines(from, to) < 0) 1111 return ERR; 1112 current_addr = from - 1; 1113 SPL1(); 1114 if (put_sbuf_line(buf) == NULL || 1115 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1116 SPL0(); 1117 return ERR; 1118 } 1119 modified = 1; 1120 SPL0(); 1121 return 0; 1122 } 1123 1124 1125 /* move_lines: move a range of lines */ 1126 int 1127 move_lines(addr) 1128 long addr; 1129 { 1130 line_t *b1, *a1, *b2, *a2; 1131 long n = INC_MOD(second_addr, addr_last); 1132 long p = first_addr - 1; 1133 int done = (addr == first_addr - 1 || addr == second_addr); 1134 1135 SPL1(); 1136 if (done) { 1137 a2 = get_addressed_line_node(n); 1138 b2 = get_addressed_line_node(p); 1139 current_addr = second_addr; 1140 } else if (push_undo_stack(UMOV, p, n) == NULL || 1141 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1142 SPL0(); 1143 return ERR; 1144 } else { 1145 a1 = get_addressed_line_node(n); 1146 if (addr < first_addr) { 1147 b1 = get_addressed_line_node(p); 1148 b2 = get_addressed_line_node(addr); 1149 /* this get_addressed_line_node last! */ 1150 } else { 1151 b2 = get_addressed_line_node(addr); 1152 b1 = get_addressed_line_node(p); 1153 /* this get_addressed_line_node last! */ 1154 } 1155 a2 = b2->q_forw; 1156 REQUE(b2, b1->q_forw); 1157 REQUE(a1->q_back, a2); 1158 REQUE(b1, a1); 1159 current_addr = addr + ((addr < first_addr) ? 1160 second_addr - first_addr + 1 : 0); 1161 } 1162 if (isglobal) 1163 unset_active_nodes(b2->q_forw, a2); 1164 modified = 1; 1165 SPL0(); 1166 return 0; 1167 } 1168 1169 1170 /* copy_lines: copy a range of lines; return status */ 1171 int 1172 copy_lines(addr) 1173 long addr; 1174 { 1175 line_t *lp, *np = get_addressed_line_node(first_addr); 1176 undo_t *up = NULL; 1177 long n = second_addr - first_addr + 1; 1178 long m = 0; 1179 1180 current_addr = addr; 1181 if (first_addr <= addr && addr < second_addr) { 1182 n = addr - first_addr + 1; 1183 m = second_addr - addr; 1184 } 1185 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1186 for (; n-- > 0; np = np->q_forw) { 1187 SPL1(); 1188 if ((lp = dup_line_node(np)) == NULL) { 1189 SPL0(); 1190 return ERR; 1191 } 1192 add_line_node(lp); 1193 if (up) 1194 up->t = lp; 1195 else if ((up = push_undo_stack(UADD, current_addr, 1196 current_addr)) == NULL) { 1197 SPL0(); 1198 return ERR; 1199 } 1200 modified = 1; 1201 SPL0(); 1202 } 1203 return 0; 1204 } 1205 1206 1207 /* delete_lines: delete a range of lines */ 1208 int 1209 delete_lines(from, to) 1210 long from, to; 1211 { 1212 line_t *n, *p; 1213 1214 SPL1(); 1215 if (push_undo_stack(UDEL, from, to) == NULL) { 1216 SPL0(); 1217 return ERR; 1218 } 1219 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1220 p = get_addressed_line_node(from - 1); 1221 /* this get_addressed_line_node last! */ 1222 if (isglobal) 1223 unset_active_nodes(p->q_forw, n); 1224 REQUE(p, n); 1225 addr_last -= to - from + 1; 1226 current_addr = from - 1; 1227 modified = 1; 1228 SPL0(); 1229 return 0; 1230 } 1231 1232 1233 /* display_lines: print a range of lines to stdout */ 1234 int 1235 display_lines(from, to, gflag) 1236 long from; 1237 long to; 1238 int gflag; 1239 { 1240 line_t *bp; 1241 line_t *ep; 1242 char *s; 1243 1244 if (!from) { 1245 sprintf(errmsg, "invalid address"); 1246 return ERR; 1247 } 1248 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1249 bp = get_addressed_line_node(from); 1250 for (; bp != ep; bp = bp->q_forw) { 1251 if ((s = get_sbuf_line(bp)) == NULL) 1252 return ERR; 1253 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1254 return ERR; 1255 } 1256 return 0; 1257 } 1258 1259 1260 #define MAXMARK 26 /* max number of marks */ 1261 1262 line_t *mark[MAXMARK]; /* line markers */ 1263 int markno; /* line marker count */ 1264 1265 /* mark_line_node: set a line node mark */ 1266 int 1267 mark_line_node(lp, n) 1268 line_t *lp; 1269 int n; 1270 { 1271 if (!islower((unsigned char)n)) { 1272 sprintf(errmsg, "invalid mark character"); 1273 return ERR; 1274 } else if (mark[n - 'a'] == NULL) 1275 markno++; 1276 mark[n - 'a'] = lp; 1277 return 0; 1278 } 1279 1280 1281 /* get_marked_node_addr: return address of a marked line */ 1282 long 1283 get_marked_node_addr(n) 1284 int n; 1285 { 1286 if (!islower((unsigned char)n)) { 1287 sprintf(errmsg, "invalid mark character"); 1288 return ERR; 1289 } 1290 return get_line_node_addr(mark[n - 'a']); 1291 } 1292 1293 1294 /* unmark_line_node: clear line node mark */ 1295 void 1296 unmark_line_node(lp) 1297 line_t *lp; 1298 { 1299 int i; 1300 1301 for (i = 0; markno && i < MAXMARK; i++) 1302 if (mark[i] == lp) { 1303 mark[i] = NULL; 1304 markno--; 1305 } 1306 } 1307 1308 1309 /* dup_line_node: return a pointer to a copy of a line node */ 1310 line_t * 1311 dup_line_node(lp) 1312 line_t *lp; 1313 { 1314 line_t *np; 1315 1316 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1317 fprintf(stderr, "%s\n", strerror(errno)); 1318 sprintf(errmsg, "out of memory"); 1319 return NULL; 1320 } 1321 np->seek = lp->seek; 1322 np->len = lp->len; 1323 return np; 1324 } 1325 1326 1327 /* has_trailing_escape: return the parity of escapes preceding a character 1328 in a string */ 1329 int 1330 has_trailing_escape(s, t) 1331 char *s; 1332 char *t; 1333 { 1334 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1335 } 1336 1337 1338 /* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ 1339 char * 1340 strip_escapes(s) 1341 char *s; 1342 { 1343 static char *file = NULL; 1344 static int filesz = 0; 1345 1346 int i = 0; 1347 1348 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 1349 /* assert: no trailing escape */ 1350 while ((file[i++] = (*s == '\\') ? *++s : *s)) 1351 s++; 1352 return file; 1353 } 1354 1355 1356 void 1357 signal_hup(signo) 1358 int signo; 1359 { 1360 if (mutex) 1361 sigflags |= (1 << (signo - 1)); 1362 else handle_hup(signo); 1363 } 1364 1365 1366 void 1367 signal_int(signo) 1368 int signo; 1369 { 1370 if (mutex) 1371 sigflags |= (1 << (signo - 1)); 1372 else handle_int(signo); 1373 } 1374 1375 1376 void 1377 handle_hup(signo) 1378 int signo; 1379 { 1380 char *hup = NULL; /* hup filename */ 1381 char *s; 1382 int n; 1383 1384 if (!sigactive) 1385 quit(1); 1386 sigflags &= ~(1 << (signo - 1)); 1387 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1388 (s = getenv("HOME")) != NULL && 1389 (n = strlen(s)) + 8 <= MAXPATHLEN && /* "ed.hup" + '/' */ 1390 (hup = (char *) malloc(n + 10)) != NULL) { 1391 strcpy(hup, s); 1392 if (hup[n - 1] != '/') 1393 hup[n] = '/', hup[n+1] = '\0'; 1394 strcat(hup, "ed.hup"); 1395 write_file(hup, "w", 1, addr_last); 1396 } 1397 quit(2); 1398 } 1399 1400 1401 void 1402 handle_int(signo) 1403 int signo; 1404 { 1405 if (!sigactive) 1406 quit(1); 1407 sigflags &= ~(1 << (signo - 1)); 1408 #ifdef _POSIX_SOURCE 1409 siglongjmp(env, -1); 1410 #else 1411 longjmp(env, -1); 1412 #endif 1413 } 1414 1415 1416 int cols = 72; /* wrap column */ 1417 1418 void 1419 handle_winch(signo) 1420 int signo; 1421 { 1422 struct winsize ws; /* window size structure */ 1423 1424 sigflags &= ~(1 << (signo - 1)); 1425 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1426 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1427 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1428 } 1429 } 1430 1431 1432 /* is_legal_filename: return a legal filename */ 1433 int 1434 is_legal_filename(s) 1435 char *s; 1436 { 1437 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1438 sprintf(errmsg, "shell access restricted"); 1439 return 0; 1440 } 1441 return 1; 1442 } 1443