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 static sigjmp_buf env; 70 #else 71 static jmp_buf env; 72 #endif 73 74 /* static buffers */ 75 char stdinbuf[1]; /* stdin buffer */ 76 static char *shcmd; /* shell command buffer */ 77 static int shcmdsz; /* shell command buffer size */ 78 static 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 static 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 static 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 static int sigactive = 0; /* if set, signal handlers are enabled */ 94 95 static 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 static const char *prompt; /* command-line prompt */ 100 static const char *dps = "*"; /* default command-line prompt */ 101 102 static 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; 258 static long addr_cnt; 259 260 /* extract_addr_range: get line addresses from the command buffer until an 261 illegal address is seen; return status */ 262 int 263 extract_addr_range(void) 264 { 265 long addr; 266 267 addr_cnt = 0; 268 first_addr = second_addr = current_addr; 269 while ((addr = next_addr()) >= 0) { 270 addr_cnt++; 271 first_addr = second_addr; 272 second_addr = addr; 273 if (*ibufp != ',' && *ibufp != ';') 274 break; 275 else if (*ibufp++ == ';') 276 current_addr = addr; 277 } 278 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 279 first_addr = second_addr; 280 return (addr == ERR) ? ERR : 0; 281 } 282 283 284 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++ 285 286 #define MUST_BE_FIRST() do { \ 287 if (!first) { \ 288 errmsg = "invalid address"; \ 289 return ERR; \ 290 } \ 291 } while (0) 292 293 /* next_addr: return the next line address in the command buffer */ 294 long 295 next_addr(void) 296 { 297 const char *hd; 298 long addr = current_addr; 299 long n; 300 int first = 1; 301 int c; 302 303 SKIP_BLANKS(); 304 for (hd = ibufp;; first = 0) 305 switch (c = *ibufp) { 306 case '+': 307 case '\t': 308 case ' ': 309 case '-': 310 case '^': 311 ibufp++; 312 SKIP_BLANKS(); 313 if (isdigit((unsigned char)*ibufp)) { 314 STRTOL(n, ibufp); 315 addr += (c == '-' || c == '^') ? -n : n; 316 } else if (!isspace((unsigned char)c)) 317 addr += (c == '-' || c == '^') ? -1 : 1; 318 break; 319 case '0': case '1': case '2': 320 case '3': case '4': case '5': 321 case '6': case '7': case '8': case '9': 322 MUST_BE_FIRST(); 323 STRTOL(addr, ibufp); 324 break; 325 case '.': 326 case '$': 327 MUST_BE_FIRST(); 328 ibufp++; 329 addr = (c == '.') ? current_addr : addr_last; 330 break; 331 case '/': 332 case '?': 333 MUST_BE_FIRST(); 334 if ((addr = get_matching_node_addr( 335 get_compiled_pattern(), c == '/')) < 0) 336 return ERR; 337 else if (c == *ibufp) 338 ibufp++; 339 break; 340 case '\'': 341 MUST_BE_FIRST(); 342 ibufp++; 343 if ((addr = get_marked_node_addr(*ibufp++)) < 0) 344 return ERR; 345 break; 346 case '%': 347 case ',': 348 case ';': 349 if (first) { 350 ibufp++; 351 addr_cnt++; 352 second_addr = (c == ';') ? current_addr : 1; 353 addr = addr_last; 354 break; 355 } 356 /* FALLTHROUGH */ 357 default: 358 if (ibufp == hd) 359 return EOF; 360 else if (addr < 0 || addr_last < addr) { 361 errmsg = "invalid address"; 362 return ERR; 363 } else 364 return addr; 365 } 366 /* NOTREACHED */ 367 } 368 369 370 #ifdef BACKWARDS 371 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 372 #define GET_THIRD_ADDR(addr) \ 373 { \ 374 long ol1, ol2; \ 375 \ 376 ol1 = first_addr, ol2 = second_addr; \ 377 if (extract_addr_range() < 0) \ 378 return ERR; \ 379 else if (addr_cnt == 0) { \ 380 errmsg = "destination expected"; \ 381 return ERR; \ 382 } else if (second_addr < 0 || addr_last < second_addr) { \ 383 errmsg = "invalid address"; \ 384 return ERR; \ 385 } \ 386 addr = second_addr; \ 387 first_addr = ol1, second_addr = ol2; \ 388 } 389 #else /* BACKWARDS */ 390 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 391 #define GET_THIRD_ADDR(addr) \ 392 { \ 393 long ol1, ol2; \ 394 \ 395 ol1 = first_addr, ol2 = second_addr; \ 396 if (extract_addr_range() < 0) \ 397 return ERR; \ 398 if (second_addr < 0 || addr_last < second_addr) { \ 399 errmsg = "invalid address"; \ 400 return ERR; \ 401 } \ 402 addr = second_addr; \ 403 first_addr = ol1, second_addr = ol2; \ 404 } 405 #endif 406 407 408 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 409 #define GET_COMMAND_SUFFIX() { \ 410 int done = 0; \ 411 do { \ 412 switch(*ibufp) { \ 413 case 'p': \ 414 gflag |= GPR, ibufp++; \ 415 break; \ 416 case 'l': \ 417 gflag |= GLS, ibufp++; \ 418 break; \ 419 case 'n': \ 420 gflag |= GNP, ibufp++; \ 421 break; \ 422 default: \ 423 done++; \ 424 } \ 425 } while (!done); \ 426 if (*ibufp++ != '\n') { \ 427 errmsg = "invalid command suffix"; \ 428 return ERR; \ 429 } \ 430 } 431 432 433 /* sflags */ 434 #define SGG 001 /* complement previous global substitute suffix */ 435 #define SGP 002 /* complement previous print suffix */ 436 #define SGR 004 /* use last regex instead of last pat */ 437 #define SGF 010 /* repeat last substitution */ 438 439 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 440 441 long rows = 22; /* scroll length: ws_row - 2 */ 442 443 /* exec_command: execute the next command in command buffer; return print 444 request, if any */ 445 int 446 exec_command(void) 447 { 448 static pattern_t *pat = NULL; 449 static int sgflag = 0; 450 static long sgnum = 0; 451 452 pattern_t *tpat; 453 char *fnp; 454 int gflag = 0; 455 int sflags = 0; 456 long addr = 0; 457 int n = 0; 458 int c; 459 460 SKIP_BLANKS(); 461 switch(c = *ibufp++) { 462 case 'a': 463 GET_COMMAND_SUFFIX(); 464 if (!isglobal) clear_undo_stack(); 465 if (append_lines(second_addr) < 0) 466 return ERR; 467 break; 468 case 'c': 469 if (check_addr_range(current_addr, current_addr) < 0) 470 return ERR; 471 GET_COMMAND_SUFFIX(); 472 if (!isglobal) clear_undo_stack(); 473 if (delete_lines(first_addr, second_addr) < 0 || 474 append_lines(current_addr) < 0) 475 return ERR; 476 break; 477 case 'd': 478 if (check_addr_range(current_addr, current_addr) < 0) 479 return ERR; 480 GET_COMMAND_SUFFIX(); 481 if (!isglobal) clear_undo_stack(); 482 if (delete_lines(first_addr, second_addr) < 0) 483 return ERR; 484 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 485 current_addr = addr; 486 break; 487 case 'e': 488 if (modified && !scripted) 489 return EMOD; 490 /* FALLTHROUGH */ 491 case 'E': 492 if (addr_cnt > 0) { 493 errmsg = "unexpected address"; 494 return ERR; 495 } else if (!isspace((unsigned char)*ibufp)) { 496 errmsg = "unexpected command suffix"; 497 return ERR; 498 } else if ((fnp = get_filename()) == NULL) 499 return ERR; 500 GET_COMMAND_SUFFIX(); 501 if (delete_lines(1, addr_last) < 0) 502 return ERR; 503 clear_undo_stack(); 504 if (close_sbuf() < 0) 505 return ERR; 506 else if (open_sbuf() < 0) 507 return FATAL; 508 if (*fnp && *fnp != '!') 509 strlcpy(old_filename, fnp, PATH_MAX); 510 #ifdef BACKWARDS 511 if (*fnp == '\0' && *old_filename == '\0') { 512 errmsg = "no current filename"; 513 return ERR; 514 } 515 #endif 516 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 517 return ERR; 518 clear_undo_stack(); 519 modified = 0; 520 u_current_addr = u_addr_last = -1; 521 break; 522 case 'f': 523 if (addr_cnt > 0) { 524 errmsg = "unexpected address"; 525 return ERR; 526 } else if (!isspace((unsigned char)*ibufp)) { 527 errmsg = "unexpected command suffix"; 528 return ERR; 529 } else if ((fnp = get_filename()) == NULL) 530 return ERR; 531 else if (*fnp == '!') { 532 errmsg = "invalid redirection"; 533 return ERR; 534 } 535 GET_COMMAND_SUFFIX(); 536 if (*fnp) 537 strlcpy(old_filename, fnp, PATH_MAX); 538 printf("%s\n", strip_escapes(old_filename)); 539 break; 540 case 'g': 541 case 'v': 542 case 'G': 543 case 'V': 544 if (isglobal) { 545 errmsg = "cannot nest global commands"; 546 return ERR; 547 } else if (check_addr_range(1, addr_last) < 0) 548 return ERR; 549 else if (build_active_list(c == 'g' || c == 'G') < 0) 550 return ERR; 551 else if ((n = (c == 'G' || c == 'V'))) 552 GET_COMMAND_SUFFIX(); 553 isglobal++; 554 if (exec_global(n, gflag) < 0) 555 return ERR; 556 break; 557 case 'h': 558 if (addr_cnt > 0) { 559 errmsg = "unexpected address"; 560 return ERR; 561 } 562 GET_COMMAND_SUFFIX(); 563 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 564 break; 565 case 'H': 566 if (addr_cnt > 0) { 567 errmsg = "unexpected address"; 568 return ERR; 569 } 570 GET_COMMAND_SUFFIX(); 571 if ((garrulous = 1 - garrulous) && *errmsg) 572 fprintf(stderr, "%s\n", errmsg); 573 break; 574 case 'i': 575 if (second_addr == 0) { 576 errmsg = "invalid address"; 577 return ERR; 578 } 579 GET_COMMAND_SUFFIX(); 580 if (!isglobal) clear_undo_stack(); 581 if (append_lines(second_addr - 1) < 0) 582 return ERR; 583 break; 584 case 'j': 585 if (check_addr_range(current_addr, current_addr + 1) < 0) 586 return ERR; 587 GET_COMMAND_SUFFIX(); 588 if (!isglobal) clear_undo_stack(); 589 if (first_addr != second_addr && 590 join_lines(first_addr, second_addr) < 0) 591 return ERR; 592 break; 593 case 'k': 594 c = *ibufp++; 595 if (second_addr == 0) { 596 errmsg = "invalid address"; 597 return ERR; 598 } 599 GET_COMMAND_SUFFIX(); 600 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 601 return ERR; 602 break; 603 case 'l': 604 if (check_addr_range(current_addr, current_addr) < 0) 605 return ERR; 606 GET_COMMAND_SUFFIX(); 607 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 608 return ERR; 609 gflag = 0; 610 break; 611 case 'm': 612 if (check_addr_range(current_addr, current_addr) < 0) 613 return ERR; 614 GET_THIRD_ADDR(addr); 615 if (first_addr <= addr && addr < second_addr) { 616 errmsg = "invalid destination"; 617 return ERR; 618 } 619 GET_COMMAND_SUFFIX(); 620 if (!isglobal) clear_undo_stack(); 621 if (move_lines(addr) < 0) 622 return ERR; 623 break; 624 case 'n': 625 if (check_addr_range(current_addr, current_addr) < 0) 626 return ERR; 627 GET_COMMAND_SUFFIX(); 628 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 629 return ERR; 630 gflag = 0; 631 break; 632 case 'p': 633 if (check_addr_range(current_addr, current_addr) < 0) 634 return ERR; 635 GET_COMMAND_SUFFIX(); 636 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 637 return ERR; 638 gflag = 0; 639 break; 640 case 'P': 641 if (addr_cnt > 0) { 642 errmsg = "unexpected address"; 643 return ERR; 644 } 645 GET_COMMAND_SUFFIX(); 646 prompt = prompt ? NULL : optarg ? optarg : dps; 647 break; 648 case 'q': 649 case 'Q': 650 if (addr_cnt > 0) { 651 errmsg = "unexpected address"; 652 return ERR; 653 } 654 GET_COMMAND_SUFFIX(); 655 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 656 break; 657 case 'r': 658 if (!isspace((unsigned char)*ibufp)) { 659 errmsg = "unexpected command suffix"; 660 return ERR; 661 } else if (addr_cnt == 0) 662 second_addr = addr_last; 663 if ((fnp = get_filename()) == NULL) 664 return ERR; 665 GET_COMMAND_SUFFIX(); 666 if (!isglobal) clear_undo_stack(); 667 if (*old_filename == '\0' && *fnp != '!') 668 strlcpy(old_filename, fnp, PATH_MAX); 669 #ifdef BACKWARDS 670 if (*fnp == '\0' && *old_filename == '\0') { 671 errmsg = "no current filename"; 672 return ERR; 673 } 674 #endif 675 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 676 return ERR; 677 else if (addr && addr != addr_last) 678 modified = 1; 679 break; 680 case 's': 681 do { 682 switch(*ibufp) { 683 case '\n': 684 sflags |=SGF; 685 break; 686 case 'g': 687 sflags |= SGG; 688 ibufp++; 689 break; 690 case 'p': 691 sflags |= SGP; 692 ibufp++; 693 break; 694 case 'r': 695 sflags |= SGR; 696 ibufp++; 697 break; 698 case '0': case '1': case '2': case '3': case '4': 699 case '5': case '6': case '7': case '8': case '9': 700 STRTOL(sgnum, ibufp); 701 sflags |= SGF; 702 sgflag &= ~GSG; /* override GSG */ 703 break; 704 default: 705 if (sflags) { 706 errmsg = "invalid command suffix"; 707 return ERR; 708 } 709 } 710 } while (sflags && *ibufp != '\n'); 711 if (sflags && !pat) { 712 errmsg = "no previous substitution"; 713 return ERR; 714 } else if (sflags & SGG) 715 sgnum = 0; /* override numeric arg */ 716 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 717 errmsg = "invalid pattern delimiter"; 718 return ERR; 719 } 720 tpat = pat; 721 SPL1(); 722 if ((!sflags || (sflags & SGR)) && 723 (tpat = get_compiled_pattern()) == NULL) { 724 SPL0(); 725 return ERR; 726 } else if (tpat != pat) { 727 if (pat) { 728 regfree(pat); 729 free(pat); 730 } 731 pat = tpat; 732 patlock = 1; /* reserve pattern */ 733 } 734 SPL0(); 735 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 736 return ERR; 737 else if (isglobal) 738 sgflag |= GLB; 739 else 740 sgflag &= ~GLB; 741 if (sflags & SGG) 742 sgflag ^= GSG; 743 if (sflags & SGP) 744 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 745 do { 746 switch(*ibufp) { 747 case 'p': 748 sgflag |= GPR, ibufp++; 749 break; 750 case 'l': 751 sgflag |= GLS, ibufp++; 752 break; 753 case 'n': 754 sgflag |= GNP, ibufp++; 755 break; 756 default: 757 n++; 758 } 759 } while (!n); 760 if (check_addr_range(current_addr, current_addr) < 0) 761 return ERR; 762 GET_COMMAND_SUFFIX(); 763 if (!isglobal) clear_undo_stack(); 764 if (search_and_replace(pat, sgflag, sgnum) < 0) 765 return ERR; 766 break; 767 case 't': 768 if (check_addr_range(current_addr, current_addr) < 0) 769 return ERR; 770 GET_THIRD_ADDR(addr); 771 GET_COMMAND_SUFFIX(); 772 if (!isglobal) clear_undo_stack(); 773 if (copy_lines(addr) < 0) 774 return ERR; 775 break; 776 case 'u': 777 if (addr_cnt > 0) { 778 errmsg = "unexpected address"; 779 return ERR; 780 } 781 GET_COMMAND_SUFFIX(); 782 if (pop_undo_stack() < 0) 783 return ERR; 784 break; 785 case 'w': 786 case 'W': 787 if ((n = *ibufp) == 'q' || n == 'Q') { 788 gflag = EOF; 789 ibufp++; 790 } 791 if (!isspace((unsigned char)*ibufp)) { 792 errmsg = "unexpected command suffix"; 793 return ERR; 794 } else if ((fnp = get_filename()) == NULL) 795 return ERR; 796 if (addr_cnt == 0 && !addr_last) 797 first_addr = second_addr = 0; 798 else if (check_addr_range(1, addr_last) < 0) 799 return ERR; 800 GET_COMMAND_SUFFIX(); 801 if (*old_filename == '\0' && *fnp != '!') 802 strlcpy(old_filename, fnp, PATH_MAX); 803 #ifdef BACKWARDS 804 if (*fnp == '\0' && *old_filename == '\0') { 805 errmsg = "no current filename"; 806 return ERR; 807 } 808 #endif 809 if ((addr = write_file(*fnp ? fnp : old_filename, 810 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 811 return ERR; 812 else if (addr == addr_last) 813 modified = 0; 814 else if (modified && !scripted && n == 'q') 815 gflag = EMOD; 816 break; 817 case 'x': 818 if (addr_cnt > 0) { 819 errmsg = "unexpected address"; 820 return ERR; 821 } 822 GET_COMMAND_SUFFIX(); 823 #ifdef DES 824 des = get_keyword(); 825 break; 826 #else 827 errmsg = "crypt unavailable"; 828 return ERR; 829 #endif 830 case 'z': 831 #ifdef BACKWARDS 832 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 833 #else 834 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 835 #endif 836 return ERR; 837 else if ('0' < *ibufp && *ibufp <= '9') 838 STRTOL(rows, ibufp); 839 GET_COMMAND_SUFFIX(); 840 if (display_lines(second_addr, min(addr_last, 841 second_addr + rows), gflag) < 0) 842 return ERR; 843 gflag = 0; 844 break; 845 case '=': 846 GET_COMMAND_SUFFIX(); 847 printf("%ld\n", addr_cnt ? second_addr : addr_last); 848 break; 849 case '!': 850 if (addr_cnt > 0) { 851 errmsg = "unexpected address"; 852 return ERR; 853 } else if ((sflags = get_shell_command()) < 0) 854 return ERR; 855 GET_COMMAND_SUFFIX(); 856 if (sflags) printf("%s\n", shcmd + 1); 857 system(shcmd + 1); 858 if (!scripted) printf("!\n"); 859 break; 860 case '\n': 861 #ifdef BACKWARDS 862 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 863 #else 864 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 865 #endif 866 || display_lines(second_addr, second_addr, 0) < 0) 867 return ERR; 868 break; 869 default: 870 errmsg = "unknown command"; 871 return ERR; 872 } 873 return gflag; 874 } 875 876 877 /* check_addr_range: return status of address range check */ 878 int 879 check_addr_range(long n, long m) 880 { 881 if (addr_cnt == 0) { 882 first_addr = n; 883 second_addr = m; 884 } 885 if (first_addr > second_addr || 1 > first_addr || 886 second_addr > addr_last) { 887 errmsg = "invalid address"; 888 return ERR; 889 } 890 return 0; 891 } 892 893 894 /* get_matching_node_addr: return the address of the next line matching a 895 pattern in a given direction. wrap around begin/end of editor buffer if 896 necessary */ 897 long 898 get_matching_node_addr(pattern_t *pat, int dir) 899 { 900 char *s; 901 long n = current_addr; 902 line_t *lp; 903 904 if (!pat) return ERR; 905 do { 906 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { 907 lp = get_addressed_line_node(n); 908 if ((s = get_sbuf_line(lp)) == NULL) 909 return ERR; 910 if (isbinary) 911 NUL_TO_NEWLINE(s, lp->len); 912 if (!regexec(pat, s, 0, NULL, 0)) 913 return n; 914 } 915 } while (n != current_addr); 916 errmsg = "no match"; 917 return ERR; 918 } 919 920 921 /* get_filename: return pointer to copy of filename in the command buffer */ 922 char * 923 get_filename(void) 924 { 925 static char *file = NULL; 926 static int filesz = 0; 927 928 int n; 929 930 if (*ibufp != '\n') { 931 SKIP_BLANKS(); 932 if (*ibufp == '\n') { 933 errmsg = "invalid filename"; 934 return NULL; 935 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 936 return NULL; 937 else if (*ibufp == '!') { 938 ibufp++; 939 if ((n = get_shell_command()) < 0) 940 return NULL; 941 if (n) 942 printf("%s\n", shcmd + 1); 943 return shcmd; 944 } else if (n > PATH_MAX - 1) { 945 errmsg = "filename too long"; 946 return NULL; 947 } 948 } 949 #ifndef BACKWARDS 950 else if (*old_filename == '\0') { 951 errmsg = "no current filename"; 952 return NULL; 953 } 954 #endif 955 REALLOC(file, filesz, PATH_MAX, NULL); 956 for (n = 0; *ibufp != '\n';) 957 file[n++] = *ibufp++; 958 file[n] = '\0'; 959 return is_legal_filename(file) ? file : NULL; 960 } 961 962 963 /* get_shell_command: read a shell command from stdin; return substitution 964 status */ 965 int 966 get_shell_command(void) 967 { 968 static char *buf = NULL; 969 static int n = 0; 970 971 char *s; /* substitution char pointer */ 972 int i = 0; 973 int j = 0; 974 975 if (red) { 976 errmsg = "shell access restricted"; 977 return ERR; 978 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 979 return ERR; 980 REALLOC(buf, n, j + 1, ERR); 981 buf[i++] = '!'; /* prefix command w/ bang */ 982 while (*ibufp != '\n') 983 switch (*ibufp) { 984 default: 985 REALLOC(buf, n, i + 2, ERR); 986 buf[i++] = *ibufp; 987 if (*ibufp++ == '\\') 988 buf[i++] = *ibufp++; 989 break; 990 case '!': 991 if (s != ibufp) { 992 REALLOC(buf, n, i + 1, ERR); 993 buf[i++] = *ibufp++; 994 } 995 #ifdef BACKWARDS 996 else if (shcmd == NULL || *(shcmd + 1) == '\0') 997 #else 998 else if (shcmd == NULL) 999 #endif 1000 { 1001 errmsg = "no previous command"; 1002 return ERR; 1003 } else { 1004 REALLOC(buf, n, i + shcmdi, ERR); 1005 for (s = shcmd + 1; s < shcmd + shcmdi;) 1006 buf[i++] = *s++; 1007 s = ibufp++; 1008 } 1009 break; 1010 case '%': 1011 if (*old_filename == '\0') { 1012 errmsg = "no current filename"; 1013 return ERR; 1014 } 1015 j = strlen(s = strip_escapes(old_filename)); 1016 REALLOC(buf, n, i + j, ERR); 1017 while (j--) 1018 buf[i++] = *s++; 1019 s = ibufp++; 1020 break; 1021 } 1022 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1023 memcpy(shcmd, buf, i); 1024 shcmd[shcmdi = i] = '\0'; 1025 return *s == '!' || *s == '%'; 1026 } 1027 1028 1029 /* append_lines: insert text from stdin to after line n; stop when either a 1030 single period is read or EOF; return status */ 1031 int 1032 append_lines(long n) 1033 { 1034 int l; 1035 const char *lp = ibuf; 1036 const char *eot; 1037 undo_t *up = NULL; 1038 1039 for (current_addr = n;;) { 1040 if (!isglobal) { 1041 if ((l = get_tty_line()) < 0) 1042 return ERR; 1043 else if (l == 0 || ibuf[l - 1] != '\n') { 1044 clearerr(stdin); 1045 return l ? EOF : 0; 1046 } 1047 lp = ibuf; 1048 } else if (*(lp = ibufp) == '\0') 1049 return 0; 1050 else { 1051 while (*ibufp++ != '\n') 1052 ; 1053 l = ibufp - lp; 1054 } 1055 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1056 return 0; 1057 } 1058 eot = lp + l; 1059 SPL1(); 1060 do { 1061 if ((lp = put_sbuf_line(lp)) == NULL) { 1062 SPL0(); 1063 return ERR; 1064 } else if (up) 1065 up->t = get_addressed_line_node(current_addr); 1066 else if ((up = push_undo_stack(UADD, current_addr, 1067 current_addr)) == NULL) { 1068 SPL0(); 1069 return ERR; 1070 } 1071 } while (lp != eot); 1072 modified = 1; 1073 SPL0(); 1074 } 1075 /* NOTREACHED */ 1076 } 1077 1078 1079 /* join_lines: replace a range of lines with the joined text of those lines */ 1080 int 1081 join_lines(long from, long to) 1082 { 1083 static char *buf = NULL; 1084 static int n; 1085 1086 char *s; 1087 int size = 0; 1088 line_t *bp, *ep; 1089 1090 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1091 bp = get_addressed_line_node(from); 1092 for (; bp != ep; bp = bp->q_forw) { 1093 if ((s = get_sbuf_line(bp)) == NULL) 1094 return ERR; 1095 REALLOC(buf, n, size + bp->len, ERR); 1096 memcpy(buf + size, s, bp->len); 1097 size += bp->len; 1098 } 1099 REALLOC(buf, n, size + 2, ERR); 1100 memcpy(buf + size, "\n", 2); 1101 if (delete_lines(from, to) < 0) 1102 return ERR; 1103 current_addr = from - 1; 1104 SPL1(); 1105 if (put_sbuf_line(buf) == NULL || 1106 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1107 SPL0(); 1108 return ERR; 1109 } 1110 modified = 1; 1111 SPL0(); 1112 return 0; 1113 } 1114 1115 1116 /* move_lines: move a range of lines */ 1117 int 1118 move_lines(long addr) 1119 { 1120 line_t *b1, *a1, *b2, *a2; 1121 long n = INC_MOD(second_addr, addr_last); 1122 long p = first_addr - 1; 1123 int done = (addr == first_addr - 1 || addr == second_addr); 1124 1125 SPL1(); 1126 if (done) { 1127 a2 = get_addressed_line_node(n); 1128 b2 = get_addressed_line_node(p); 1129 current_addr = second_addr; 1130 } else if (push_undo_stack(UMOV, p, n) == NULL || 1131 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1132 SPL0(); 1133 return ERR; 1134 } else { 1135 a1 = get_addressed_line_node(n); 1136 if (addr < first_addr) { 1137 b1 = get_addressed_line_node(p); 1138 b2 = get_addressed_line_node(addr); 1139 /* this get_addressed_line_node last! */ 1140 } else { 1141 b2 = get_addressed_line_node(addr); 1142 b1 = get_addressed_line_node(p); 1143 /* this get_addressed_line_node last! */ 1144 } 1145 a2 = b2->q_forw; 1146 REQUE(b2, b1->q_forw); 1147 REQUE(a1->q_back, a2); 1148 REQUE(b1, a1); 1149 current_addr = addr + ((addr < first_addr) ? 1150 second_addr - first_addr + 1 : 0); 1151 } 1152 if (isglobal) 1153 unset_active_nodes(b2->q_forw, a2); 1154 modified = 1; 1155 SPL0(); 1156 return 0; 1157 } 1158 1159 1160 /* copy_lines: copy a range of lines; return status */ 1161 int 1162 copy_lines(long addr) 1163 { 1164 line_t *lp, *np = get_addressed_line_node(first_addr); 1165 undo_t *up = NULL; 1166 long n = second_addr - first_addr + 1; 1167 long m = 0; 1168 1169 current_addr = addr; 1170 if (first_addr <= addr && addr < second_addr) { 1171 n = addr - first_addr + 1; 1172 m = second_addr - addr; 1173 } 1174 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1175 for (; n-- > 0; np = np->q_forw) { 1176 SPL1(); 1177 if ((lp = dup_line_node(np)) == NULL) { 1178 SPL0(); 1179 return ERR; 1180 } 1181 add_line_node(lp); 1182 if (up) 1183 up->t = lp; 1184 else if ((up = push_undo_stack(UADD, current_addr, 1185 current_addr)) == NULL) { 1186 SPL0(); 1187 return ERR; 1188 } 1189 modified = 1; 1190 SPL0(); 1191 } 1192 return 0; 1193 } 1194 1195 1196 /* delete_lines: delete a range of lines */ 1197 int 1198 delete_lines(long from, long to) 1199 { 1200 line_t *n, *p; 1201 1202 SPL1(); 1203 if (push_undo_stack(UDEL, from, to) == NULL) { 1204 SPL0(); 1205 return ERR; 1206 } 1207 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1208 p = get_addressed_line_node(from - 1); 1209 /* this get_addressed_line_node last! */ 1210 if (isglobal) 1211 unset_active_nodes(p->q_forw, n); 1212 REQUE(p, n); 1213 addr_last -= to - from + 1; 1214 current_addr = from - 1; 1215 modified = 1; 1216 SPL0(); 1217 return 0; 1218 } 1219 1220 1221 /* display_lines: print a range of lines to stdout */ 1222 int 1223 display_lines(long from, long to, int gflag) 1224 { 1225 line_t *bp; 1226 line_t *ep; 1227 char *s; 1228 1229 if (!from) { 1230 errmsg = "invalid address"; 1231 return ERR; 1232 } 1233 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1234 bp = get_addressed_line_node(from); 1235 for (; bp != ep; bp = bp->q_forw) { 1236 if ((s = get_sbuf_line(bp)) == NULL) 1237 return ERR; 1238 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1239 return ERR; 1240 } 1241 return 0; 1242 } 1243 1244 1245 #define MAXMARK 26 /* max number of marks */ 1246 1247 static line_t *mark[MAXMARK]; /* line markers */ 1248 static int markno; /* line marker count */ 1249 1250 /* mark_line_node: set a line node mark */ 1251 int 1252 mark_line_node(line_t *lp, int n) 1253 { 1254 if (!islower((unsigned char)n)) { 1255 errmsg = "invalid mark character"; 1256 return ERR; 1257 } else if (mark[n - 'a'] == NULL) 1258 markno++; 1259 mark[n - 'a'] = lp; 1260 return 0; 1261 } 1262 1263 1264 /* get_marked_node_addr: return address of a marked line */ 1265 long 1266 get_marked_node_addr(int n) 1267 { 1268 if (!islower((unsigned char)n)) { 1269 errmsg = "invalid mark character"; 1270 return ERR; 1271 } 1272 return get_line_node_addr(mark[n - 'a']); 1273 } 1274 1275 1276 /* unmark_line_node: clear line node mark */ 1277 void 1278 unmark_line_node(line_t *lp) 1279 { 1280 int i; 1281 1282 for (i = 0; markno && i < MAXMARK; i++) 1283 if (mark[i] == lp) { 1284 mark[i] = NULL; 1285 markno--; 1286 } 1287 } 1288 1289 1290 /* dup_line_node: return a pointer to a copy of a line node */ 1291 line_t * 1292 dup_line_node(line_t *lp) 1293 { 1294 line_t *np; 1295 1296 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1297 fprintf(stderr, "%s\n", strerror(errno)); 1298 errmsg = "out of memory"; 1299 return NULL; 1300 } 1301 np->seek = lp->seek; 1302 np->len = lp->len; 1303 return np; 1304 } 1305 1306 1307 /* has_trailing_escape: return the parity of escapes preceding a character 1308 in a string */ 1309 int 1310 has_trailing_escape(char *s, char *t) 1311 { 1312 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1313 } 1314 1315 1316 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */ 1317 char * 1318 strip_escapes(char *s) 1319 { 1320 static char *file = NULL; 1321 static int filesz = 0; 1322 1323 int i = 0; 1324 1325 REALLOC(file, filesz, PATH_MAX, NULL); 1326 while (i < filesz - 1 /* Worry about a possible trailing escape */ 1327 && (file[i++] = (*s == '\\') ? *++s : *s)) 1328 s++; 1329 return file; 1330 } 1331 1332 1333 void 1334 signal_hup(int signo) 1335 { 1336 if (mutex) 1337 sigflags |= (1 << (signo - 1)); 1338 else 1339 handle_hup(signo); 1340 } 1341 1342 1343 void 1344 signal_int(int signo) 1345 { 1346 if (mutex) 1347 sigflags |= (1 << (signo - 1)); 1348 else 1349 handle_int(signo); 1350 } 1351 1352 1353 void 1354 handle_hup(int signo) 1355 { 1356 char *hup = NULL; /* hup filename */ 1357 char *s; 1358 char ed_hup[] = "ed.hup"; 1359 int n; 1360 1361 if (!sigactive) 1362 quit(1); 1363 sigflags &= ~(1 << (signo - 1)); 1364 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 && 1365 (s = getenv("HOME")) != NULL && 1366 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */ 1367 (hup = (char *) malloc(n + 10)) != NULL) { 1368 strcpy(hup, s); 1369 if (hup[n - 1] != '/') 1370 hup[n] = '/', hup[n+1] = '\0'; 1371 strcat(hup, "ed.hup"); 1372 write_file(hup, "w", 1, addr_last); 1373 } 1374 quit(2); 1375 } 1376 1377 1378 void 1379 handle_int(int signo) 1380 { 1381 if (!sigactive) 1382 quit(1); 1383 sigflags &= ~(1 << (signo - 1)); 1384 #ifdef _POSIX_SOURCE 1385 siglongjmp(env, -1); 1386 #else 1387 longjmp(env, -1); 1388 #endif 1389 } 1390 1391 1392 int cols = 72; /* wrap column */ 1393 1394 void 1395 handle_winch(int signo) 1396 { 1397 int save_errno = errno; 1398 1399 struct winsize ws; /* window size structure */ 1400 1401 sigflags &= ~(1 << (signo - 1)); 1402 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1403 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1404 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1405 } 1406 errno = save_errno; 1407 } 1408 1409 1410 /* is_legal_filename: return a legal filename */ 1411 int 1412 is_legal_filename(char *s) 1413 { 1414 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1415 errmsg = "shell access restricted"; 1416 return 0; 1417 } 1418 return 1; 1419 } 1420