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