1 /* $OpenBSD: main.c,v 1.70 2024/10/12 07:58:40 jsg Exp $ */ 2 /* $NetBSD: main.c,v 1.3 1995/03/21 09:04:44 cgd Exp $ */ 3 4 /* main.c: This file contains the main control and user-interface routines 5 for the ed line editor. */ 6 /*- 7 * Copyright (c) 1993 Andrew Moore, Talke Studio. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * CREDITS 34 * 35 * This program is based on the editor algorithm described in 36 * Brian W. Kernighan and P. J. Plauger's book "Software Tools 37 * in Pascal," Addison-Wesley, 1981. 38 * 39 * The buffering algorithm is attributed to Rodney Ruddock of 40 * the University of Guelph, Guelph, Ontario. 41 * 42 */ 43 44 #include <sys/ioctl.h> 45 #include <sys/stat.h> 46 #include <sys/wait.h> 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <limits.h> 52 #include <pwd.h> 53 #include <regex.h> 54 #include <setjmp.h> 55 #include <signal.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #include "ed.h" 62 63 void signal_hup(int); 64 void signal_int(int); 65 void handle_winch(int); 66 67 static int next_addr(void); 68 static int check_addr_range(int, int); 69 static int get_matching_node_addr(regex_t *, int); 70 static char *get_filename(int); 71 static int get_shell_command(void); 72 static int append_lines(int); 73 static int join_lines(int, int); 74 static int move_lines(int); 75 static int copy_lines(int); 76 static int mark_line_node(line_t *, int); 77 static int get_marked_node_addr(int); 78 static line_t *dup_line_node(line_t *); 79 80 sigjmp_buf env; 81 82 /* static buffers */ 83 static char errmsg[PATH_MAX + 40]; /* error message buffer */ 84 static char *shcmd; /* shell command buffer */ 85 static int shcmdsz; /* shell command buffer size */ 86 static int shcmdi; /* shell command buffer index */ 87 static char old_filename[PATH_MAX]; /* default filename */ 88 89 /* global buffers */ 90 char *ibuf; /* ed command-line buffer */ 91 int ibufsz; /* ed command-line buffer size */ 92 char *ibufp; /* pointer to ed command-line buffer */ 93 94 /* global flags */ 95 int garrulous = 0; /* if set, print all error messages */ 96 int isbinary; /* if set, buffer contains ASCII NULs */ 97 int isglobal; /* if set, doing a global command */ 98 int modified; /* if set, buffer modified since last write */ 99 int scripted = 0; /* if set, suppress diagnostics */ 100 int interactive = 0; /* if set, we are in interactive mode */ 101 102 volatile sig_atomic_t mutex = 0; /* if set, signals set flags */ 103 volatile sig_atomic_t sighup = 0; /* if set, sighup received while mutex set */ 104 volatile sig_atomic_t sigint = 0; /* if set, sigint received while mutex set */ 105 106 /* if set, signal handlers are enabled */ 107 volatile sig_atomic_t sigactive = 0; 108 109 int current_addr; /* current address in editor buffer */ 110 int addr_last; /* last address in editor buffer */ 111 int lineno; /* script line number */ 112 static char *prompt; /* command-line prompt */ 113 static char *dps = "*"; /* default command-line prompt */ 114 115 static const char usage[] = "usage: %s [-] [-s] [-p string] [file]\n"; 116 117 static char *home; /* home directory */ 118 119 void 120 seterrmsg(char *s) 121 { 122 strlcpy(errmsg, s, sizeof(errmsg)); 123 } 124 125 /* ed: line editor */ 126 int 127 main(volatile int argc, char ** volatile argv) 128 { 129 int c, n; 130 int status = 0; 131 132 if (pledge("stdio rpath wpath cpath proc exec tty", NULL) == -1) 133 err(1, "pledge"); 134 135 home = getenv("HOME"); 136 137 top: 138 while ((c = getopt(argc, argv, "p:sx")) != -1) 139 switch (c) { 140 case 'p': /* set prompt */ 141 dps = prompt = optarg; 142 break; 143 case 's': /* run script */ 144 scripted = 1; 145 break; 146 case 'x': /* use crypt */ 147 fprintf(stderr, "crypt unavailable\n?\n"); 148 break; 149 default: 150 fprintf(stderr, usage, argv[0]); 151 exit(1); 152 } 153 argv += optind; 154 argc -= optind; 155 if (argc && **argv == '-') { 156 scripted = 1; 157 if (argc > 1) { 158 optind = 1; 159 goto top; 160 } 161 argv++; 162 argc--; 163 } 164 165 if (!(interactive = isatty(0))) { 166 struct stat sb; 167 168 /* assert: pipes show up as fifo's when fstat'd */ 169 if (fstat(STDIN_FILENO, &sb) || !S_ISFIFO(sb.st_mode)) { 170 if (lseek(STDIN_FILENO, 0, SEEK_CUR)) { 171 interactive = 1; 172 setvbuf(stdout, NULL, _IOLBF, 0); 173 } 174 } 175 } 176 177 /* assert: reliable signals! */ 178 if (isatty(STDIN_FILENO)) { 179 handle_winch(SIGWINCH); 180 signal(SIGWINCH, handle_winch); 181 } 182 signal(SIGHUP, signal_hup); 183 siginterrupt(SIGHUP, 1); 184 signal(SIGQUIT, SIG_IGN); 185 signal(SIGINT, signal_int); 186 if (sigsetjmp(env, 1)) { 187 status = -1; 188 fputs("\n?\n", stdout); 189 seterrmsg("interrupt"); 190 } else { 191 init_buffers(); 192 sigactive = 1; /* enable signal handlers */ 193 if (argc && **argv) { 194 if (read_file(*argv, 0) < 0 && !interactive) 195 quit(2); 196 else if (**argv != '!') 197 strlcpy(old_filename, *argv, 198 sizeof old_filename); 199 } else if (argc) { 200 fputs("?\n", stdout); 201 if (**argv == '\0') 202 seterrmsg("invalid filename"); 203 if (!interactive) 204 quit(2); 205 } 206 } 207 for (;;) { 208 if (status < 0 && garrulous) 209 fprintf(stderr, "%s\n", errmsg); 210 if (prompt) { 211 fputs(prompt, stdout); 212 fflush(stdout); 213 } 214 if ((n = get_tty_line()) < 0) { 215 status = ERR; 216 continue; 217 } else if (n == 0) { 218 if (modified && !scripted) { 219 fputs("?\n", stdout); 220 seterrmsg("warning: file modified"); 221 if (!interactive) { 222 if (garrulous) 223 fprintf(stderr, 224 "script, line %d: %s\n", 225 lineno, errmsg); 226 quit(2); 227 } 228 clearerr(stdin); 229 modified = 0; 230 status = EMOD; 231 continue; 232 } else 233 quit(0); 234 } else if (ibuf[n - 1] != '\n') { 235 /* discard line */ 236 seterrmsg("unexpected end-of-file"); 237 clearerr(stdin); 238 status = ERR; 239 continue; 240 } 241 isglobal = 0; 242 if ((status = extract_addr_range()) >= 0 && 243 (status = exec_command()) >= 0) 244 if (!status || (status && 245 (status = display_lines(current_addr, current_addr, 246 status)) >= 0)) 247 continue; 248 switch (status) { 249 case EOF: 250 quit(0); 251 break; 252 case EMOD: 253 modified = 0; 254 fputs("?\n", stdout); /* give warning */ 255 seterrmsg("warning: file modified"); 256 if (!interactive) { 257 if (garrulous) 258 fprintf(stderr, 259 "script, line %d: %s\n", 260 lineno, errmsg); 261 quit(2); 262 } 263 break; 264 case FATAL: 265 if (!interactive) { 266 if (garrulous) 267 fprintf(stderr, 268 "script, line %d: %s\n", 269 lineno, errmsg); 270 } else if (garrulous) 271 fprintf(stderr, "%s\n", errmsg); 272 quit(3); 273 break; 274 default: 275 fputs("?\n", stdout); 276 if (!interactive) { 277 if (garrulous) 278 fprintf(stderr, 279 "script, line %d: %s\n", 280 lineno, errmsg); 281 quit(2); 282 } 283 break; 284 } 285 } 286 /*NOTREACHED*/ 287 } 288 289 int first_addr, second_addr, addr_cnt; 290 291 /* extract_addr_range: get line addresses from the command buffer until an 292 illegal address is seen; return status */ 293 int 294 extract_addr_range(void) 295 { 296 int addr; 297 298 addr_cnt = 0; 299 first_addr = second_addr = current_addr; 300 while ((addr = next_addr()) >= 0) { 301 addr_cnt++; 302 first_addr = second_addr; 303 second_addr = addr; 304 if (*ibufp != ',' && *ibufp != ';') 305 break; 306 else if (*ibufp++ == ';') 307 current_addr = addr; 308 } 309 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 310 first_addr = second_addr; 311 return (addr == ERR) ? ERR : 0; 312 } 313 314 315 #define SKIP_BLANKS() \ 316 do { \ 317 while (isspace((unsigned char)*ibufp) && *ibufp != '\n') \ 318 ibufp++; \ 319 } while (0) 320 321 #define MUST_BE_FIRST() \ 322 do { \ 323 if (!first) { \ 324 seterrmsg("invalid address"); \ 325 return ERR; \ 326 } \ 327 } while (0) 328 329 330 /* next_addr: return the next line address in the command buffer */ 331 static int 332 next_addr(void) 333 { 334 char *hd; 335 int addr = current_addr; 336 int n; 337 int first = 1; 338 int c; 339 340 SKIP_BLANKS(); 341 for (hd = ibufp;; first = 0) 342 switch ((c = (unsigned char)*ibufp)) { 343 case '+': 344 case '\t': 345 case ' ': 346 case '-': 347 case '^': 348 ibufp++; 349 SKIP_BLANKS(); 350 if (isdigit((unsigned char)*ibufp)) { 351 STRTOI(n, ibufp); 352 addr += (c == '-' || c == '^') ? -n : n; 353 } else if (!isspace(c)) 354 addr += (c == '-' || c == '^') ? -1 : 1; 355 break; 356 case '0': case '1': case '2': 357 case '3': case '4': case '5': 358 case '6': case '7': case '8': case '9': 359 MUST_BE_FIRST(); 360 STRTOI(addr, ibufp); 361 break; 362 case '.': 363 case '$': 364 MUST_BE_FIRST(); 365 ibufp++; 366 addr = (c == '.') ? current_addr : addr_last; 367 break; 368 case '/': 369 case '?': 370 MUST_BE_FIRST(); 371 if ((addr = get_matching_node_addr( 372 get_compiled_pattern(), c == '/')) < 0) 373 return ERR; 374 else if (c == *ibufp) 375 ibufp++; 376 break; 377 case '\'': 378 MUST_BE_FIRST(); 379 ibufp++; 380 if ((addr = get_marked_node_addr((unsigned char)*ibufp++)) < 0) 381 return ERR; 382 break; 383 case '%': 384 case ',': 385 case ';': 386 if (first) { 387 ibufp++; 388 addr_cnt++; 389 second_addr = (c == ';') ? current_addr : 1; 390 if ((addr = next_addr()) < 0) 391 addr = addr_last; 392 break; 393 } 394 /* FALLTHROUGH */ 395 default: 396 if (ibufp == hd) 397 return EOF; 398 else if (addr < 0 || addr_last < addr) { 399 seterrmsg("invalid address"); 400 return ERR; 401 } else 402 return addr; 403 } 404 /* NOTREACHED */ 405 } 406 407 408 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 409 #define GET_THIRD_ADDR(addr) \ 410 do { \ 411 int ol1, ol2; \ 412 \ 413 ol1 = first_addr; \ 414 ol2 = second_addr; \ 415 if (extract_addr_range() < 0) \ 416 return ERR; \ 417 else if (addr_cnt == 0) { \ 418 seterrmsg("destination expected"); \ 419 return ERR; \ 420 } else if (second_addr < 0 || addr_last < second_addr) { \ 421 seterrmsg("invalid address"); \ 422 return ERR; \ 423 } \ 424 addr = second_addr; \ 425 first_addr = ol1; \ 426 second_addr = ol2; \ 427 } while (0) 428 429 430 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 431 #define GET_COMMAND_SUFFIX() \ 432 do { \ 433 int done = 0; \ 434 do { \ 435 switch (*ibufp) { \ 436 case 'p': \ 437 gflag |= GPR; \ 438 ibufp++; \ 439 break; \ 440 case 'l': \ 441 gflag |= GLS; \ 442 ibufp++; \ 443 break; \ 444 case 'n': \ 445 gflag |= GNP; \ 446 ibufp++; \ 447 break; \ 448 default: \ 449 done++; \ 450 } \ 451 } while (!done); \ 452 if (*ibufp++ != '\n') { \ 453 seterrmsg("invalid command suffix"); \ 454 return ERR; \ 455 } \ 456 } while (0) 457 458 /* sflags */ 459 #define SGG 001 /* complement previous global substitute suffix */ 460 #define SGP 002 /* complement previous print suffix */ 461 #define SGR 004 /* use last regex instead of last pat */ 462 #define SGF 010 /* repeat last substitution */ 463 464 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 465 466 volatile sig_atomic_t rows = 22; /* scroll length: ws_row - 2 */ 467 volatile sig_atomic_t cols = 72; /* wrap column */ 468 469 /* exec_command: execute the next command in command buffer; return print 470 request, if any */ 471 int 472 exec_command(void) 473 { 474 extern int u_current_addr; 475 extern int u_addr_last; 476 477 static regex_t *pat = NULL; 478 static int sgflag = 0; 479 static int sgnum = 0; 480 481 regex_t *tpat; 482 char *fnp; 483 int gflag = 0; 484 int sflags = 0; 485 int addr = 0; 486 int n = 0; 487 int c; 488 489 SKIP_BLANKS(); 490 switch ((c = (unsigned char)*ibufp++)) { 491 case 'a': 492 GET_COMMAND_SUFFIX(); 493 if (!isglobal) clear_undo_stack(); 494 if (append_lines(second_addr) < 0) 495 return ERR; 496 break; 497 case 'c': 498 if (check_addr_range(current_addr, current_addr) < 0) 499 return ERR; 500 GET_COMMAND_SUFFIX(); 501 if (!isglobal) clear_undo_stack(); 502 if (delete_lines(first_addr, second_addr) < 0 || 503 append_lines(current_addr) < 0) 504 return ERR; 505 break; 506 case 'd': 507 if (check_addr_range(current_addr, current_addr) < 0) 508 return ERR; 509 GET_COMMAND_SUFFIX(); 510 if (!isglobal) clear_undo_stack(); 511 if (delete_lines(first_addr, second_addr) < 0) 512 return ERR; 513 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 514 current_addr = addr; 515 break; 516 case 'e': 517 if (modified && !scripted) 518 return EMOD; 519 /* FALLTHROUGH */ 520 case 'E': 521 if (addr_cnt > 0) { 522 seterrmsg("unexpected address"); 523 return ERR; 524 } else if (!isspace((unsigned char)*ibufp)) { 525 seterrmsg("unexpected command suffix"); 526 return ERR; 527 } else if ((fnp = get_filename(1)) == NULL) 528 return ERR; 529 GET_COMMAND_SUFFIX(); 530 if (delete_lines(1, addr_last) < 0) 531 return ERR; 532 clear_undo_stack(); 533 if (close_sbuf() < 0) 534 return ERR; 535 else if (open_sbuf() < 0) 536 return FATAL; 537 if (read_file(fnp, 0) < 0) 538 return ERR; 539 clear_undo_stack(); 540 modified = 0; 541 u_current_addr = u_addr_last = -1; 542 break; 543 case 'f': 544 if (addr_cnt > 0) { 545 seterrmsg("unexpected address"); 546 return ERR; 547 } else if (!isspace((unsigned char)*ibufp)) { 548 seterrmsg("unexpected command suffix"); 549 return ERR; 550 } else if ((fnp = get_filename(1)) == NULL) 551 return ERR; 552 else if (*fnp == '!') { 553 seterrmsg("invalid redirection"); 554 return ERR; 555 } 556 GET_COMMAND_SUFFIX(); 557 puts(strip_escapes(fnp)); 558 break; 559 case 'g': 560 case 'v': 561 case 'G': 562 case 'V': 563 if (isglobal) { 564 seterrmsg("cannot nest global commands"); 565 return ERR; 566 } else if (check_addr_range(1, addr_last) < 0) 567 return ERR; 568 else if (build_active_list(c == 'g' || c == 'G') < 0) 569 return ERR; 570 else if ((n = (c == 'G' || c == 'V'))) 571 GET_COMMAND_SUFFIX(); 572 isglobal++; 573 if (exec_global(n, gflag) < 0) 574 return ERR; 575 break; 576 case 'h': 577 if (addr_cnt > 0) { 578 seterrmsg("unexpected address"); 579 return ERR; 580 } 581 GET_COMMAND_SUFFIX(); 582 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 583 break; 584 case 'H': 585 if (addr_cnt > 0) { 586 seterrmsg("unexpected address"); 587 return ERR; 588 } 589 GET_COMMAND_SUFFIX(); 590 if ((garrulous = 1 - garrulous) && *errmsg) 591 fprintf(stderr, "%s\n", errmsg); 592 break; 593 case 'i': 594 if (second_addr == 0) { 595 second_addr = 1; 596 } 597 GET_COMMAND_SUFFIX(); 598 if (!isglobal) clear_undo_stack(); 599 if (append_lines(second_addr - 1) < 0) 600 return ERR; 601 break; 602 case 'j': 603 if (check_addr_range(current_addr, current_addr + 1) < 0) 604 return ERR; 605 GET_COMMAND_SUFFIX(); 606 if (!isglobal) clear_undo_stack(); 607 if (first_addr != second_addr && 608 join_lines(first_addr, second_addr) < 0) 609 return ERR; 610 break; 611 case 'k': 612 c = (unsigned char)*ibufp++; 613 if (second_addr == 0) { 614 seterrmsg("invalid address"); 615 return ERR; 616 } 617 GET_COMMAND_SUFFIX(); 618 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 619 return ERR; 620 break; 621 case 'l': 622 if (check_addr_range(current_addr, current_addr) < 0) 623 return ERR; 624 GET_COMMAND_SUFFIX(); 625 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 626 return ERR; 627 gflag = 0; 628 break; 629 case 'm': 630 if (check_addr_range(current_addr, current_addr) < 0) 631 return ERR; 632 GET_THIRD_ADDR(addr); 633 if (first_addr <= addr && addr < second_addr) { 634 seterrmsg("invalid destination"); 635 return ERR; 636 } 637 GET_COMMAND_SUFFIX(); 638 if (!isglobal) clear_undo_stack(); 639 if (move_lines(addr) < 0) 640 return ERR; 641 break; 642 case 'n': 643 if (check_addr_range(current_addr, current_addr) < 0) 644 return ERR; 645 GET_COMMAND_SUFFIX(); 646 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 647 return ERR; 648 gflag = 0; 649 break; 650 case 'p': 651 if (check_addr_range(current_addr, current_addr) < 0) 652 return ERR; 653 GET_COMMAND_SUFFIX(); 654 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 655 return ERR; 656 gflag = 0; 657 break; 658 case 'P': 659 if (addr_cnt > 0) { 660 seterrmsg("unexpected address"); 661 return ERR; 662 } 663 GET_COMMAND_SUFFIX(); 664 prompt = prompt ? NULL : optarg ? optarg : dps; 665 break; 666 case 'q': 667 case 'Q': 668 if (addr_cnt > 0) { 669 seterrmsg("unexpected address"); 670 return ERR; 671 } 672 GET_COMMAND_SUFFIX(); 673 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 674 break; 675 case 'r': 676 if (!isspace((unsigned char)*ibufp)) { 677 seterrmsg("unexpected command suffix"); 678 return ERR; 679 } else if (addr_cnt == 0) 680 second_addr = addr_last; 681 if ((fnp = get_filename(0)) == NULL) 682 return ERR; 683 GET_COMMAND_SUFFIX(); 684 if (!isglobal) clear_undo_stack(); 685 if ((addr = read_file(fnp, second_addr)) < 0) 686 return ERR; 687 else if (addr) 688 modified = 1; 689 break; 690 case 's': 691 do { 692 switch (*ibufp) { 693 case '\n': 694 sflags |=SGF; 695 break; 696 case 'g': 697 sflags |= SGG; 698 ibufp++; 699 break; 700 case 'p': 701 sflags |= SGP; 702 ibufp++; 703 break; 704 case 'r': 705 sflags |= SGR; 706 ibufp++; 707 break; 708 case '0': case '1': case '2': case '3': case '4': 709 case '5': case '6': case '7': case '8': case '9': 710 STRTOI(sgnum, ibufp); 711 sflags |= SGF; 712 sgflag &= ~GSG; /* override GSG */ 713 break; 714 default: 715 if (sflags) { 716 seterrmsg("invalid command suffix"); 717 return ERR; 718 } 719 } 720 } while (sflags && *ibufp != '\n'); 721 if (sflags && !pat) { 722 seterrmsg("no previous substitution"); 723 return ERR; 724 } else if (sflags & SGG) 725 sgnum = 0; /* override numeric arg */ 726 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 727 seterrmsg("invalid pattern delimiter"); 728 return ERR; 729 } 730 tpat = pat; 731 SPL1(); 732 if ((!sflags || (sflags & SGR)) && 733 (tpat = get_compiled_pattern()) == NULL) { 734 SPL0(); 735 return ERR; 736 } else if (tpat != pat) { 737 if (pat) { 738 regfree(pat); 739 free(pat); 740 } 741 pat = tpat; 742 patlock = 1; /* reserve pattern */ 743 } 744 SPL0(); 745 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 746 return ERR; 747 else if (isglobal) 748 sgflag |= GLB; 749 else 750 sgflag &= ~GLB; 751 if (sflags & SGG) 752 sgflag ^= GSG; 753 if (sflags & SGP) { 754 sgflag ^= GPR; 755 sgflag &= ~(GLS | GNP); 756 } 757 do { 758 switch (*ibufp) { 759 case 'p': 760 sgflag |= GPR; 761 ibufp++; 762 break; 763 case 'l': 764 sgflag |= GLS; 765 ibufp++; 766 break; 767 case 'n': 768 sgflag |= GNP; 769 ibufp++; 770 break; 771 default: 772 n++; 773 } 774 } while (!n); 775 if (check_addr_range(current_addr, current_addr) < 0) 776 return ERR; 777 GET_COMMAND_SUFFIX(); 778 if (!isglobal) clear_undo_stack(); 779 if (search_and_replace(pat, sgflag, sgnum) < 0) 780 return ERR; 781 break; 782 case 't': 783 if (check_addr_range(current_addr, current_addr) < 0) 784 return ERR; 785 GET_THIRD_ADDR(addr); 786 GET_COMMAND_SUFFIX(); 787 if (!isglobal) clear_undo_stack(); 788 if (copy_lines(addr) < 0) 789 return ERR; 790 break; 791 case 'u': 792 if (addr_cnt > 0) { 793 seterrmsg("unexpected address"); 794 return ERR; 795 } 796 GET_COMMAND_SUFFIX(); 797 if (pop_undo_stack() < 0) 798 return ERR; 799 break; 800 case 'w': 801 case 'W': 802 if ((n = *ibufp) == 'q' || n == 'Q') { 803 gflag = EOF; 804 ibufp++; 805 } 806 if (!isspace((unsigned char)*ibufp)) { 807 seterrmsg("unexpected command suffix"); 808 return ERR; 809 } else if ((fnp = get_filename(0)) == NULL) 810 return ERR; 811 if (addr_cnt == 0 && !addr_last) 812 first_addr = second_addr = 0; 813 else if (check_addr_range(1, addr_last) < 0) 814 return ERR; 815 GET_COMMAND_SUFFIX(); 816 if ((addr = write_file(fnp, (c == 'W') ? "a" : "w", 817 first_addr, second_addr)) < 0) 818 return ERR; 819 else if (addr == addr_last && *fnp != '!') 820 modified = 0; 821 else if (modified && !scripted && n == 'q') 822 gflag = EMOD; 823 break; 824 case 'x': 825 if (addr_cnt > 0) { 826 seterrmsg("unexpected address"); 827 return ERR; 828 } 829 GET_COMMAND_SUFFIX(); 830 seterrmsg("crypt unavailable"); 831 return ERR; 832 case 'z': 833 first_addr = 1; 834 if (check_addr_range(first_addr, current_addr + 1) < 0) 835 return ERR; 836 else if ('0' < *ibufp && *ibufp <= '9') 837 STRTOI(rows, ibufp); 838 GET_COMMAND_SUFFIX(); 839 if (display_lines(second_addr, min(addr_last, 840 second_addr + rows), gflag) < 0) 841 return ERR; 842 gflag = 0; 843 break; 844 case '=': 845 GET_COMMAND_SUFFIX(); 846 printf("%d\n", addr_cnt ? second_addr : addr_last); 847 break; 848 case '!': 849 if (addr_cnt > 0) { 850 seterrmsg("unexpected address"); 851 return ERR; 852 } else if ((sflags = get_shell_command()) < 0) 853 return ERR; 854 GET_COMMAND_SUFFIX(); 855 if (sflags) printf("%s\n", shcmd + 1); 856 fflush(NULL); /* flush any buffered I/O */ 857 system(shcmd + 1); 858 if (!scripted) printf("!\n"); 859 break; 860 case '\n': 861 first_addr = 1; 862 if (check_addr_range(first_addr, current_addr + 1) < 0 863 || display_lines(second_addr, second_addr, 0) < 0) 864 return ERR; 865 break; 866 default: 867 seterrmsg("unknown command"); 868 return ERR; 869 } 870 return gflag; 871 } 872 873 874 /* check_addr_range: return status of address range check */ 875 static int 876 check_addr_range(int n, int m) 877 { 878 if (addr_cnt == 0) { 879 first_addr = n; 880 second_addr = m; 881 } 882 if (first_addr > second_addr || 1 > first_addr || 883 second_addr > addr_last) { 884 seterrmsg("invalid address"); 885 return ERR; 886 } 887 return 0; 888 } 889 890 891 /* get_matching_node_addr: return the address of the next line matching a 892 pattern in a given direction. wrap around begin/end of editor buffer if 893 necessary */ 894 static int 895 get_matching_node_addr(regex_t *pat, int dir) 896 { 897 char *s; 898 int n = current_addr; 899 line_t *lp; 900 901 if (!pat) return ERR; 902 do { 903 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { 904 lp = get_addressed_line_node(n); 905 if ((s = get_sbuf_line(lp)) == NULL) 906 return ERR; 907 if (isbinary) 908 NUL_TO_NEWLINE(s, lp->len); 909 if (!regexec(pat, s, 0, NULL, 0)) 910 return n; 911 } 912 } while (n != current_addr); 913 seterrmsg("no match"); 914 return ERR; 915 } 916 917 918 /* get_filename: return pointer to copy of filename in the command buffer */ 919 static char * 920 get_filename(int save) 921 { 922 static char filename[PATH_MAX]; 923 char *p; 924 int n; 925 926 if (*ibufp != '\n') { 927 SKIP_BLANKS(); 928 if (*ibufp == '\n') { 929 seterrmsg("invalid filename"); 930 return NULL; 931 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 932 return NULL; 933 else if (*ibufp == '!') { 934 ibufp++; 935 if ((n = get_shell_command()) < 0) 936 return NULL; 937 if (n) printf("%s\n", shcmd + 1); 938 return shcmd; 939 } else if (n >= PATH_MAX - 1) { 940 seterrmsg("filename too long"); 941 return NULL; 942 } 943 } else { 944 if (*old_filename == '\0') { 945 seterrmsg("no current filename"); 946 return NULL; 947 } 948 return old_filename; 949 } 950 951 p = save ? old_filename : *old_filename ? filename : old_filename; 952 for (n = 0; *ibufp != '\n';) 953 p[n++] = *ibufp++; 954 p[n] = '\0'; 955 return p; 956 } 957 958 959 /* get_shell_command: read a shell command from stdin; return substitution 960 status */ 961 static int 962 get_shell_command(void) 963 { 964 static char *buf = NULL; 965 static int n = 0; 966 967 char *s; /* substitution char pointer */ 968 int i = 0; 969 int j = 0; 970 971 if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 972 return ERR; 973 REALLOC(buf, n, j + 1, ERR); 974 buf[i++] = '!'; /* prefix command w/ bang */ 975 while (*ibufp != '\n') 976 switch (*ibufp) { 977 default: 978 REALLOC(buf, n, i + 2, ERR); 979 buf[i++] = *ibufp; 980 if (*ibufp++ == '\\') 981 buf[i++] = *ibufp++; 982 break; 983 case '!': 984 if (s != ibufp) { 985 REALLOC(buf, n, i + 1, ERR); 986 buf[i++] = *ibufp++; 987 } 988 else if (shcmd == NULL) 989 { 990 seterrmsg("no previous command"); 991 return ERR; 992 } else { 993 REALLOC(buf, n, i + shcmdi, ERR); 994 for (s = shcmd + 1; s < shcmd + shcmdi;) 995 buf[i++] = *s++; 996 s = ibufp++; 997 } 998 break; 999 case '%': 1000 if (*old_filename == '\0') { 1001 seterrmsg("no current filename"); 1002 return ERR; 1003 } 1004 j = strlen(s = strip_escapes(old_filename)); 1005 REALLOC(buf, n, i + j, ERR); 1006 while (j--) 1007 buf[i++] = *s++; 1008 s = ibufp++; 1009 break; 1010 } 1011 if (i == 1) { 1012 seterrmsg("no command"); 1013 return ERR; 1014 } 1015 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1016 memcpy(shcmd, buf, i); 1017 shcmd[shcmdi = i] = '\0'; 1018 return *s == '!' || *s == '%'; 1019 } 1020 1021 1022 /* append_lines: insert text from stdin to after line n; stop when either a 1023 single period is read or EOF; return status */ 1024 static int 1025 append_lines(int n) 1026 { 1027 int l; 1028 char *lp = ibuf; 1029 char *eot; 1030 undo_t *up = NULL; 1031 1032 for (current_addr = n;;) { 1033 if (!isglobal) { 1034 if ((l = get_tty_line()) < 0) 1035 return ERR; 1036 else if (l == 0 || ibuf[l - 1] != '\n') { 1037 clearerr(stdin); 1038 return l ? EOF : 0; 1039 } 1040 lp = ibuf; 1041 } else if (*(lp = ibufp) == '\0') 1042 return 0; 1043 else { 1044 while (*ibufp++ != '\n') 1045 ; 1046 l = ibufp - lp; 1047 } 1048 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1049 return 0; 1050 } 1051 eot = lp + l; 1052 SPL1(); 1053 do { 1054 if ((lp = put_sbuf_line(lp)) == NULL) { 1055 SPL0(); 1056 return ERR; 1057 } else if (up) 1058 up->t = get_addressed_line_node(current_addr); 1059 else if ((up = push_undo_stack(UADD, current_addr, 1060 current_addr)) == NULL) { 1061 SPL0(); 1062 return ERR; 1063 } 1064 } while (lp != eot); 1065 modified = 1; 1066 SPL0(); 1067 } 1068 /* NOTREACHED */ 1069 } 1070 1071 1072 /* join_lines: replace a range of lines with the joined text of those lines */ 1073 static int 1074 join_lines(int from, int to) 1075 { 1076 static char *buf = NULL; 1077 static int n; 1078 1079 char *s; 1080 int size = 0; 1081 line_t *bp, *ep; 1082 1083 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1084 bp = get_addressed_line_node(from); 1085 for (; bp != ep; bp = bp->q_forw) { 1086 if ((s = get_sbuf_line(bp)) == NULL) 1087 return ERR; 1088 REALLOC(buf, n, size + bp->len, ERR); 1089 memcpy(buf + size, s, bp->len); 1090 size += bp->len; 1091 } 1092 REALLOC(buf, n, size + 2, ERR); 1093 memcpy(buf + size, "\n", 2); 1094 if (delete_lines(from, to) < 0) 1095 return ERR; 1096 current_addr = from - 1; 1097 SPL1(); 1098 if (put_sbuf_line(buf) == NULL || 1099 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1100 SPL0(); 1101 return ERR; 1102 } 1103 modified = 1; 1104 SPL0(); 1105 return 0; 1106 } 1107 1108 1109 /* move_lines: move a range of lines */ 1110 static int 1111 move_lines(int addr) 1112 { 1113 line_t *b1, *a1, *b2, *a2; 1114 int n = INC_MOD(second_addr, addr_last); 1115 int p = first_addr - 1; 1116 int done = (addr == first_addr - 1 || addr == second_addr); 1117 1118 SPL1(); 1119 if (done) { 1120 a2 = get_addressed_line_node(n); 1121 b2 = get_addressed_line_node(p); 1122 current_addr = second_addr; 1123 } else if (push_undo_stack(UMOV, p, n) == NULL || 1124 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1125 SPL0(); 1126 return ERR; 1127 } else { 1128 a1 = get_addressed_line_node(n); 1129 if (addr < first_addr) { 1130 b1 = get_addressed_line_node(p); 1131 b2 = get_addressed_line_node(addr); 1132 /* this get_addressed_line_node last! */ 1133 } else { 1134 b2 = get_addressed_line_node(addr); 1135 b1 = get_addressed_line_node(p); 1136 /* this get_addressed_line_node last! */ 1137 } 1138 a2 = b2->q_forw; 1139 REQUE(b2, b1->q_forw); 1140 REQUE(a1->q_back, a2); 1141 REQUE(b1, a1); 1142 current_addr = addr + ((addr < first_addr) ? 1143 second_addr - first_addr + 1 : 0); 1144 } 1145 if (isglobal) 1146 unset_active_nodes(b2->q_forw, a2); 1147 modified = 1; 1148 SPL0(); 1149 return 0; 1150 } 1151 1152 1153 /* copy_lines: copy a range of lines; return status */ 1154 static int 1155 copy_lines(int addr) 1156 { 1157 line_t *lp, *np = get_addressed_line_node(first_addr); 1158 undo_t *up = NULL; 1159 int n = second_addr - first_addr + 1; 1160 int m = 0; 1161 1162 current_addr = addr; 1163 if (first_addr <= addr && addr < second_addr) { 1164 n = addr - first_addr + 1; 1165 m = second_addr - addr; 1166 } 1167 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1168 for (; n-- > 0; np = np->q_forw) { 1169 SPL1(); 1170 if ((lp = dup_line_node(np)) == NULL) { 1171 SPL0(); 1172 return ERR; 1173 } 1174 add_line_node(lp); 1175 if (up) 1176 up->t = lp; 1177 else if ((up = push_undo_stack(UADD, current_addr, 1178 current_addr)) == NULL) { 1179 SPL0(); 1180 return ERR; 1181 } 1182 modified = 1; 1183 SPL0(); 1184 } 1185 return 0; 1186 } 1187 1188 1189 /* delete_lines: delete a range of lines */ 1190 int 1191 delete_lines(int from, int to) 1192 { 1193 line_t *n, *p; 1194 1195 SPL1(); 1196 if (push_undo_stack(UDEL, from, to) == NULL) { 1197 SPL0(); 1198 return ERR; 1199 } 1200 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1201 p = get_addressed_line_node(from - 1); 1202 /* this get_addressed_line_node last! */ 1203 if (isglobal) 1204 unset_active_nodes(p->q_forw, n); 1205 REQUE(p, n); 1206 addr_last -= to - from + 1; 1207 current_addr = from - 1; 1208 modified = 1; 1209 SPL0(); 1210 return 0; 1211 } 1212 1213 1214 /* display_lines: print a range of lines to stdout */ 1215 int 1216 display_lines(int from, int to, int gflag) 1217 { 1218 line_t *bp; 1219 line_t *ep; 1220 char *s; 1221 1222 if (!from) { 1223 seterrmsg("invalid address"); 1224 return ERR; 1225 } 1226 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1227 bp = get_addressed_line_node(from); 1228 for (; bp != ep; bp = bp->q_forw) { 1229 if ((s = get_sbuf_line(bp)) == NULL) 1230 return ERR; 1231 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1232 return ERR; 1233 } 1234 return 0; 1235 } 1236 1237 1238 #define MAXMARK 26 /* max number of marks */ 1239 1240 static line_t *mark[MAXMARK]; /* line markers */ 1241 static int markno; /* line marker count */ 1242 1243 /* mark_line_node: set a line node mark */ 1244 static int 1245 mark_line_node(line_t *lp, int n) 1246 { 1247 if (!islower(n)) { 1248 seterrmsg("invalid mark character"); 1249 return ERR; 1250 } else if (mark[n - 'a'] == NULL) 1251 markno++; 1252 mark[n - 'a'] = lp; 1253 return 0; 1254 } 1255 1256 1257 /* get_marked_node_addr: return address of a marked line */ 1258 static int 1259 get_marked_node_addr(int n) 1260 { 1261 if (!islower(n)) { 1262 seterrmsg("invalid mark character"); 1263 return ERR; 1264 } 1265 return get_line_node_addr(mark[n - 'a']); 1266 } 1267 1268 1269 /* unmark_line_node: clear line node mark */ 1270 void 1271 unmark_line_node(line_t *lp) 1272 { 1273 int i; 1274 1275 for (i = 0; markno && i < MAXMARK; i++) 1276 if (mark[i] == lp) { 1277 mark[i] = NULL; 1278 markno--; 1279 } 1280 } 1281 1282 1283 /* dup_line_node: return a pointer to a copy of a line node */ 1284 static line_t * 1285 dup_line_node(line_t *lp) 1286 { 1287 line_t *np; 1288 1289 if ((np = malloc(sizeof(line_t))) == NULL) { 1290 perror(NULL); 1291 seterrmsg("out of memory"); 1292 return NULL; 1293 } 1294 np->seek = lp->seek; 1295 np->len = lp->len; 1296 return np; 1297 } 1298 1299 1300 /* has_trailing_escape: return the parity of escapes preceding a character 1301 in a string */ 1302 int 1303 has_trailing_escape(char *s, char *t) 1304 { 1305 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1306 } 1307 1308 1309 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */ 1310 char * 1311 strip_escapes(char *s) 1312 { 1313 static char *file = NULL; 1314 static int filesz = 0; 1315 1316 int i = 0; 1317 1318 REALLOC(file, filesz, PATH_MAX, NULL); 1319 /* assert: no trailing escape */ 1320 while ((file[i++] = (*s == '\\') ? *++s : *s) != '\0' && 1321 i < PATH_MAX-1) 1322 s++; 1323 file[PATH_MAX-1] = '\0'; 1324 return file; 1325 } 1326 1327 1328 void 1329 signal_hup(int signo) 1330 { 1331 sighup = 1; 1332 } 1333 1334 1335 void 1336 signal_int(int signo) 1337 { 1338 if (mutex) 1339 sigint = 1; 1340 else 1341 handle_int(signo); /* XXX quite unsafe */ 1342 } 1343 1344 1345 void 1346 handle_hup(void) 1347 { 1348 char hup[PATH_MAX]; 1349 1350 signal(SIGHUP, SIG_IGN); 1351 sighup = 0; 1352 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1353 home != NULL && home[0] == '/') { 1354 if (strlcpy(hup, home, sizeof(hup)) < sizeof(hup) && 1355 strlcat(hup, "/ed.hup", sizeof(hup)) < sizeof(hup)) 1356 write_file(hup, "w", 1, addr_last); 1357 } 1358 exit(2); 1359 } 1360 1361 1362 void 1363 handle_int(int signo) 1364 { 1365 if (!sigactive) 1366 _exit(1); 1367 sigint = 0; 1368 siglongjmp(env, -1); 1369 } 1370 1371 1372 void 1373 handle_winch(int signo) 1374 { 1375 int save_errno = errno; 1376 struct winsize ws; /* window size structure */ 1377 1378 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == 0) { 1379 if (ws.ws_row > 2) 1380 rows = ws.ws_row - 2; 1381 if (ws.ws_col > 8) 1382 cols = ws.ws_col - 8; 1383 } 1384 errno = save_errno; 1385 } 1386