main.c revision 7165
1/* main.c: This file contains the main control and user-interface routines 2 for the ed line editor. */ 3/*- 4 * Copyright (c) 1993 Andrew Moore, Talke Studio. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $Id: main.c,v 1.3 1994/09/24 02:55:28 davidg Exp $ 29 */ 30 31#ifndef lint 32char *copyright = 33"@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\ 34 All rights reserved.\n"; 35#endif /* not lint */ 36 37#ifndef lint 38static char *rcsid = "@(#)main.c,v 1.1 1994/02/01 00:34:42 alm Exp"; 39#endif /* not lint */ 40 41/* 42 * CREDITS 43 * 44 * This program is based on the editor algorithm described in 45 * Brian W. Kernighan and P. J. Plauger's book "Software Tools 46 * in Pascal," Addison-Wesley, 1981. 47 * 48 * The buffering algorithm is attributed to Rodney Ruddock of 49 * the University of Guelph, Guelph, Ontario. 50 * 51 * The cbc.c encryption code is adapted from 52 * the bdes program by Matt Bishop of Dartmouth College, 53 * Hanover, NH. 54 * 55 */ 56 57#include <sys/ioctl.h> 58#include <sys/wait.h> 59#include <ctype.h> 60#include <setjmp.h> 61#include <pwd.h> 62 63#include "ed.h" 64 65 66#ifdef _POSIX_SOURCE 67sigjmp_buf env; 68#else 69jmp_buf env; 70#endif 71 72/* static buffers */ 73char stdinbuf[1]; /* stdin buffer */ 74char *shcmd; /* shell command buffer */ 75int shcmdsz; /* shell command buffer size */ 76int shcmdi; /* shell command buffer index */ 77char *ibuf; /* ed command-line buffer */ 78int ibufsz; /* ed command-line buffer size */ 79char *ibufp; /* pointer to ed command-line buffer */ 80 81/* global flags */ 82int des = 0; /* if set, use crypt(3) for i/o */ 83int garrulous = 0; /* if set, print all error messages */ 84int isbinary; /* if set, buffer contains ASCII NULs */ 85int isglobal; /* if set, doing a global command */ 86int modified; /* if set, buffer modified since last write */ 87int mutex = 0; /* if set, signals set "sigflags" */ 88int red = 0; /* if set, restrict shell/directory access */ 89int scripted = 0; /* if set, suppress diagnostics */ 90int sigflags = 0; /* if set, signals received while mutex set */ 91int sigactive = 0; /* if set, signal handlers are enabled */ 92 93char old_filename[MAXPATHLEN + 1] = ""; /* default filename */ 94long current_addr; /* current address in editor buffer */ 95long addr_last; /* last address in editor buffer */ 96int lineno; /* script line number */ 97char *prompt; /* command-line prompt */ 98char *dps = "*"; /* default command-line prompt */ 99 100char *usage = "usage: %s [-] [-sx] [-p string] [name]\n"; 101 102extern char errmsg[]; 103extern int optind; 104extern char *optarg; 105 106/* ed: line editor */ 107int 108main(argc, argv) 109 int argc; 110 char **argv; 111{ 112 int c, n; 113 long status = 0; 114 115 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 116top: 117 while ((c = getopt(argc, argv, "p:sx")) != EOF) 118 switch(c) { 119 case 'p': /* set prompt */ 120 prompt = optarg; 121 break; 122 case 's': /* run script */ 123 scripted = 1; 124 break; 125 case 'x': /* use crypt */ 126#ifdef DES 127 des = get_keyword(); 128#else 129 fprintf(stderr, "crypt unavailable\n?\n"); 130#endif 131 break; 132 133 default: 134 fprintf(stderr, usage, argv[0]); 135 exit(1); 136 } 137 argv += optind; 138 argc -= optind; 139 if (argc && **argv == '-') { 140 scripted = 1; 141 if (argc > 1) { 142 optind = 1; 143 goto top; 144 } 145 argv++; 146 argc--; 147 } 148 /* assert: reliable signals! */ 149#ifdef SIGWINCH 150 handle_winch(SIGWINCH); 151 if (isatty(0)) signal(SIGWINCH, handle_winch); 152#endif 153 signal(SIGHUP, signal_hup); 154 signal(SIGQUIT, SIG_IGN); 155 signal(SIGINT, signal_int); 156#ifdef _POSIX_SOURCE 157 if ((status = sigsetjmp(env, 1))) 158#else 159 if ((status = setjmp(env))) 160#endif 161 { 162 fputs("\n?\n", stderr); 163 sprintf(errmsg, "interrupt"); 164 } else { 165 init_buffers(); 166 sigactive = 1; /* enable signal handlers */ 167 if (argc && **argv && is_legal_filename(*argv)) { 168 if (read_file(*argv, 0) < 0 && !isatty(0)) 169 quit(2); 170 else if (**argv != '!') 171 strcpy(old_filename, *argv); 172 } else if (argc) { 173 fputs("?\n", stderr); 174 if (**argv == '\0') 175 sprintf(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 sprintf(errmsg, "warning: file modified"); 194 if (!isatty(0)) { 195 fprintf(stderr, garrulous ? 196 "script, line %d: %s\n" : 197 "", lineno, errmsg); 198 quit(2); 199 } 200 clearerr(stdin); 201 modified = 0; 202 status = EMOD; 203 continue; 204 } else 205 quit(0); 206 } else if (ibuf[n - 1] != '\n') { 207 /* discard line */ 208 sprintf(errmsg, "unexpected end-of-file"); 209 clearerr(stdin); 210 status = ERR; 211 continue; 212 } 213 isglobal = 0; 214 if ((status = extract_addr_range()) >= 0 && 215 (status = exec_command()) >= 0) 216 if (!status || 217 (status = display_lines(current_addr, current_addr, 218 status)) >= 0) 219 continue; 220 switch (status) { 221 case EOF: 222 quit(0); 223 case EMOD: 224 modified = 0; 225 fputs("?\n", stderr); /* give warning */ 226 sprintf(errmsg, "warning: file modified"); 227 if (!isatty(0)) { 228 fprintf(stderr, garrulous ? 229 "script, line %d: %s\n" : 230 "", lineno, errmsg); 231 quit(2); 232 } 233 break; 234 case FATAL: 235 if (!isatty(0)) 236 fprintf(stderr, garrulous ? 237 "script, line %d: %s\n" : "", 238 lineno, errmsg); 239 else 240 fprintf(stderr, garrulous ? "%s\n" : "", 241 errmsg); 242 quit(3); 243 default: 244 fputs("?\n", stderr); 245 if (!isatty(0)) { 246 fprintf(stderr, garrulous ? 247 "script, line %d: %s\n" : "", 248 lineno, errmsg); 249 quit(2); 250 } 251 break; 252 } 253 } 254 /*NOTREACHED*/ 255} 256 257long first_addr, second_addr, addr_cnt; 258 259/* extract_addr_range: get line addresses from the command buffer until an 260 illegal address is seen; return status */ 261int 262extract_addr_range() 263{ 264 long addr; 265 266 addr_cnt = 0; 267 first_addr = second_addr = current_addr; 268 while ((addr = next_addr()) >= 0) { 269 addr_cnt++; 270 first_addr = second_addr; 271 second_addr = addr; 272 if (*ibufp != ',' && *ibufp != ';') 273 break; 274 else if (*ibufp++ == ';') 275 current_addr = addr; 276 } 277 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 278 first_addr = second_addr; 279 return (addr == ERR) ? ERR : 0; 280} 281 282 283#define SKIP_BLANKS() while (isspace(*ibufp) && *ibufp != '\n') ibufp++ 284 285#define MUST_BE_FIRST() \ 286 if (!first) { sprintf(errmsg, "invalid address"); return ERR; } 287 288/* next_addr: return the next line address in the command buffer */ 289long 290next_addr() 291{ 292 char *hd; 293 long addr = current_addr; 294 long n; 295 int first = 1; 296 int c; 297 298 SKIP_BLANKS(); 299 for (hd = ibufp;; first = 0) 300 switch (c = *ibufp) { 301 case '+': 302 case '\t': 303 case ' ': 304 case '-': 305 case '^': 306 ibufp++; 307 SKIP_BLANKS(); 308 if (isdigit(*ibufp)) { 309 STRTOL(n, ibufp); 310 addr += (c == '-' || c == '^') ? -n : n; 311 } else if (!isspace(c)) 312 addr += (c == '-' || c == '^') ? -1 : 1; 313 break; 314 case '0': case '1': case '2': 315 case '3': case '4': case '5': 316 case '6': case '7': case '8': case '9': 317 MUST_BE_FIRST(); 318 STRTOL(addr, ibufp); 319 break; 320 case '.': 321 case '$': 322 MUST_BE_FIRST(); 323 ibufp++; 324 addr = (c == '.') ? current_addr : addr_last; 325 break; 326 case '/': 327 case '?': 328 MUST_BE_FIRST(); 329 if ((addr = get_matching_node_addr( 330 get_compiled_pattern(), c == '/')) < 0) 331 return ERR; 332 else if (c == *ibufp) 333 ibufp++; 334 break; 335 case '\'': 336 MUST_BE_FIRST(); 337 ibufp++; 338 if ((addr = get_marked_node_addr(*ibufp++)) < 0) 339 return ERR; 340 break; 341 case '%': 342 case ',': 343 case ';': 344 if (first) { 345 ibufp++; 346 addr_cnt++; 347 second_addr = (c == ';') ? current_addr : 1; 348 addr = addr_last; 349 break; 350 } 351 /* FALL THROUGH */ 352 default: 353 if (ibufp == hd) 354 return EOF; 355 else if (addr < 0 || addr_last < addr) { 356 sprintf(errmsg, "invalid address"); 357 return ERR; 358 } else 359 return addr; 360 } 361 /* NOTREACHED */ 362} 363 364 365#ifdef BACKWARDS 366/* GET_THIRD_ADDR: get a legal address from the command buffer */ 367#define GET_THIRD_ADDR(addr) \ 368{ \ 369 long ol1, ol2; \ 370\ 371 ol1 = first_addr, ol2 = second_addr; \ 372 if (extract_addr_range() < 0) \ 373 return ERR; \ 374 else if (addr_cnt == 0) { \ 375 sprintf(errmsg, "destination expected"); \ 376 return ERR; \ 377 } else if (second_addr < 0 || addr_last < second_addr) { \ 378 sprintf(errmsg, "invalid address"); \ 379 return ERR; \ 380 } \ 381 addr = second_addr; \ 382 first_addr = ol1, second_addr = ol2; \ 383} 384#else /* BACKWARDS */ 385/* GET_THIRD_ADDR: get a legal address from the command buffer */ 386#define GET_THIRD_ADDR(addr) \ 387{ \ 388 long ol1, ol2; \ 389\ 390 ol1 = first_addr, ol2 = second_addr; \ 391 if (extract_addr_range() < 0) \ 392 return ERR; \ 393 if (second_addr < 0 || addr_last < second_addr) { \ 394 sprintf(errmsg, "invalid address"); \ 395 return ERR; \ 396 } \ 397 addr = second_addr; \ 398 first_addr = ol1, second_addr = ol2; \ 399} 400#endif 401 402 403/* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 404#define GET_COMMAND_SUFFIX() { \ 405 int done = 0; \ 406 do { \ 407 switch(*ibufp) { \ 408 case 'p': \ 409 gflag |= GPR, ibufp++; \ 410 break; \ 411 case 'l': \ 412 gflag |= GLS, ibufp++; \ 413 break; \ 414 case 'n': \ 415 gflag |= GNP, ibufp++; \ 416 break; \ 417 default: \ 418 done++; \ 419 } \ 420 } while (!done); \ 421 if (*ibufp++ != '\n') { \ 422 sprintf(errmsg, "invalid command suffix"); \ 423 return ERR; \ 424 } \ 425} 426 427 428/* sflags */ 429#define SGG 001 /* complement previous global substitute suffix */ 430#define SGP 002 /* complement previous print suffix */ 431#define SGR 004 /* use last regex instead of last pat */ 432#define SGF 010 /* repeat last substitution */ 433 434int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 435 436long rows = 22; /* scroll length: ws_row - 2 */ 437 438/* exec_command: execute the next command in command buffer; return print 439 request, if any */ 440int 441exec_command() 442{ 443 extern long u_current_addr; 444 extern long u_addr_last; 445 446 static pattern_t *pat = NULL; 447 static int sgflag = 0; 448 static int sgnum = 0; 449 450 pattern_t *tpat; 451 char *fnp; 452 int gflag = 0; 453 int sflags = 0; 454 long addr = 0; 455 int n = 0; 456 int c; 457 458 SKIP_BLANKS(); 459 switch(c = *ibufp++) { 460 case 'a': 461 GET_COMMAND_SUFFIX(); 462 if (!isglobal) clear_undo_stack(); 463 if (append_lines(second_addr) < 0) 464 return ERR; 465 break; 466 case 'c': 467 if (check_addr_range(current_addr, current_addr) < 0) 468 return ERR; 469 GET_COMMAND_SUFFIX(); 470 if (!isglobal) clear_undo_stack(); 471 if (delete_lines(first_addr, second_addr) < 0 || 472 append_lines(current_addr) < 0) 473 return ERR; 474 break; 475 case 'd': 476 if (check_addr_range(current_addr, current_addr) < 0) 477 return ERR; 478 GET_COMMAND_SUFFIX(); 479 if (!isglobal) clear_undo_stack(); 480 if (delete_lines(first_addr, second_addr) < 0) 481 return ERR; 482 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 483 current_addr = addr; 484 break; 485 case 'e': 486 if (modified && !scripted) 487 return EMOD; 488 /* fall through */ 489 case 'E': 490 if (addr_cnt > 0) { 491 sprintf(errmsg, "unexpected address"); 492 return ERR; 493 } else if (!isspace(*ibufp)) { 494 sprintf(errmsg, "unexpected command suffix"); 495 return ERR; 496 } else if ((fnp = get_filename()) == NULL) 497 return ERR; 498 GET_COMMAND_SUFFIX(); 499 if (delete_lines(1, addr_last) < 0) 500 return ERR; 501 clear_undo_stack(); 502 if (close_sbuf() < 0) 503 return ERR; 504 else if (open_sbuf() < 0) 505 return FATAL; 506 if (*fnp && *fnp != '!') strcpy(old_filename, fnp); 507#ifdef BACKWARDS 508 if (*fnp == '\0' && *old_filename == '\0') { 509 sprintf(errmsg, "no current filename"); 510 return ERR; 511 } 512#endif 513 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 514 return ERR; 515 clear_undo_stack(); 516 modified = 0; 517 u_current_addr = u_addr_last = -1; 518 break; 519 case 'f': 520 if (addr_cnt > 0) { 521 sprintf(errmsg, "unexpected address"); 522 return ERR; 523 } else if (!isspace(*ibufp)) { 524 sprintf(errmsg, "unexpected command suffix"); 525 return ERR; 526 } else if ((fnp = get_filename()) == NULL) 527 return ERR; 528 else if (*fnp == '!') { 529 sprintf(errmsg, "invalid redirection"); 530 return ERR; 531 } 532 GET_COMMAND_SUFFIX(); 533 if (*fnp) strcpy(old_filename, fnp); 534 printf("%s\n", strip_escapes(old_filename)); 535 break; 536 case 'g': 537 case 'v': 538 case 'G': 539 case 'V': 540 if (isglobal) { 541 sprintf(errmsg, "cannot nest global commands"); 542 return ERR; 543 } else if (check_addr_range(1, addr_last) < 0) 544 return ERR; 545 else if (build_active_list(c == 'g' || c == 'G') < 0) 546 return ERR; 547 else if ((n = (c == 'G' || c == 'V'))) 548 GET_COMMAND_SUFFIX(); 549 isglobal++; 550 if (exec_global(n, gflag) < 0) 551 return ERR; 552 break; 553 case 'h': 554 if (addr_cnt > 0) { 555 sprintf(errmsg, "unexpected address"); 556 return ERR; 557 } 558 GET_COMMAND_SUFFIX(); 559 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 560 break; 561 case 'H': 562 if (addr_cnt > 0) { 563 sprintf(errmsg, "unexpected address"); 564 return ERR; 565 } 566 GET_COMMAND_SUFFIX(); 567 if ((garrulous = 1 - garrulous) && *errmsg) 568 fprintf(stderr, "%s\n", errmsg); 569 break; 570 case 'i': 571 if (second_addr == 0) { 572 sprintf(errmsg, "invalid address"); 573 return ERR; 574 } 575 GET_COMMAND_SUFFIX(); 576 if (!isglobal) clear_undo_stack(); 577 if (append_lines(second_addr - 1) < 0) 578 return ERR; 579 break; 580 case 'j': 581 if (check_addr_range(current_addr, current_addr + 1) < 0) 582 return ERR; 583 GET_COMMAND_SUFFIX(); 584 if (!isglobal) clear_undo_stack(); 585 if (first_addr != second_addr && 586 join_lines(first_addr, second_addr) < 0) 587 return ERR; 588 break; 589 case 'k': 590 c = *ibufp++; 591 if (second_addr == 0) { 592 sprintf(errmsg, "invalid address"); 593 return ERR; 594 } 595 GET_COMMAND_SUFFIX(); 596 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 597 return ERR; 598 break; 599 case 'l': 600 if (check_addr_range(current_addr, current_addr) < 0) 601 return ERR; 602 GET_COMMAND_SUFFIX(); 603 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 604 return ERR; 605 gflag = 0; 606 break; 607 case 'm': 608 if (check_addr_range(current_addr, current_addr) < 0) 609 return ERR; 610 GET_THIRD_ADDR(addr); 611 if (first_addr <= addr && addr < second_addr) { 612 sprintf(errmsg, "invalid destination"); 613 return ERR; 614 } 615 GET_COMMAND_SUFFIX(); 616 if (!isglobal) clear_undo_stack(); 617 if (move_lines(addr) < 0) 618 return ERR; 619 break; 620 case 'n': 621 if (check_addr_range(current_addr, current_addr) < 0) 622 return ERR; 623 GET_COMMAND_SUFFIX(); 624 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 625 return ERR; 626 gflag = 0; 627 break; 628 case 'p': 629 if (check_addr_range(current_addr, current_addr) < 0) 630 return ERR; 631 GET_COMMAND_SUFFIX(); 632 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 633 return ERR; 634 gflag = 0; 635 break; 636 case 'P': 637 if (addr_cnt > 0) { 638 sprintf(errmsg, "unexpected address"); 639 return ERR; 640 } 641 GET_COMMAND_SUFFIX(); 642 prompt = prompt ? NULL : optarg ? optarg : dps; 643 break; 644 case 'q': 645 case 'Q': 646 if (addr_cnt > 0) { 647 sprintf(errmsg, "unexpected address"); 648 return ERR; 649 } 650 GET_COMMAND_SUFFIX(); 651 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 652 break; 653 case 'r': 654 if (!isspace(*ibufp)) { 655 sprintf(errmsg, "unexpected command suffix"); 656 return ERR; 657 } else if (addr_cnt == 0) 658 second_addr = addr_last; 659 if ((fnp = get_filename()) == NULL) 660 return ERR; 661 GET_COMMAND_SUFFIX(); 662 if (!isglobal) clear_undo_stack(); 663 if (*old_filename == '\0' && *fnp != '!') 664 strcpy(old_filename, fnp); 665#ifdef BACKWARDS 666 if (*fnp == '\0' && *old_filename == '\0') { 667 sprintf(errmsg, "no current filename"); 668 return ERR; 669 } 670#endif 671 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 672 return ERR; 673 else if (addr && addr != addr_last) 674 modified = 1; 675 break; 676 case 's': 677 do { 678 switch(*ibufp) { 679 case '\n': 680 sflags |=SGF; 681 break; 682 case 'g': 683 sflags |= SGG; 684 ibufp++; 685 break; 686 case 'p': 687 sflags |= SGP; 688 ibufp++; 689 break; 690 case 'r': 691 sflags |= SGR; 692 ibufp++; 693 break; 694 case '0': case '1': case '2': case '3': case '4': 695 case '5': case '6': case '7': case '8': case '9': 696 STRTOL(sgnum, ibufp); 697 sflags |= SGF; 698 sgflag &= ~GSG; /* override GSG */ 699 break; 700 default: 701 if (sflags) { 702 sprintf(errmsg, "invalid command suffix"); 703 return ERR; 704 } 705 } 706 } while (sflags && *ibufp != '\n'); 707 if (sflags && !pat) { 708 sprintf(errmsg, "no previous substitution"); 709 return ERR; 710 } else if (sflags & SGG) 711 sgnum = 0; /* override numeric arg */ 712 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 713 sprintf(errmsg, "invalid pattern delimiter"); 714 return ERR; 715 } 716 tpat = pat; 717 SPL1(); 718 if ((!sflags || (sflags & SGR)) && 719 (tpat = get_compiled_pattern()) == NULL) { 720 SPL0(); 721 return ERR; 722 } else if (tpat != pat) { 723 if (pat) { 724 regfree(pat); 725 free(pat); 726 } 727 pat = tpat; 728 patlock = 1; /* reserve pattern */ 729 } 730 SPL0(); 731 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 732 return ERR; 733 else if (isglobal) 734 sgflag |= GLB; 735 else 736 sgflag &= ~GLB; 737 if (sflags & SGG) 738 sgflag ^= GSG; 739 if (sflags & SGP) 740 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 741 do { 742 switch(*ibufp) { 743 case 'p': 744 sgflag |= GPR, ibufp++; 745 break; 746 case 'l': 747 sgflag |= GLS, ibufp++; 748 break; 749 case 'n': 750 sgflag |= GNP, ibufp++; 751 break; 752 default: 753 n++; 754 } 755 } while (!n); 756 if (check_addr_range(current_addr, current_addr) < 0) 757 return ERR; 758 GET_COMMAND_SUFFIX(); 759 if (!isglobal) clear_undo_stack(); 760 if (search_and_replace(pat, sgflag, sgnum) < 0) 761 return ERR; 762 break; 763 case 't': 764 if (check_addr_range(current_addr, current_addr) < 0) 765 return ERR; 766 GET_THIRD_ADDR(addr); 767 GET_COMMAND_SUFFIX(); 768 if (!isglobal) clear_undo_stack(); 769 if (copy_lines(addr) < 0) 770 return ERR; 771 break; 772 case 'u': 773 if (addr_cnt > 0) { 774 sprintf(errmsg, "unexpected address"); 775 return ERR; 776 } 777 GET_COMMAND_SUFFIX(); 778 if (pop_undo_stack() < 0) 779 return ERR; 780 break; 781 case 'w': 782 case 'W': 783 if ((n = *ibufp) == 'q' || n == 'Q') { 784 gflag = EOF; 785 ibufp++; 786 } 787 if (!isspace(*ibufp)) { 788 sprintf(errmsg, "unexpected command suffix"); 789 return ERR; 790 } else if ((fnp = get_filename()) == NULL) 791 return ERR; 792 if (addr_cnt == 0 && !addr_last) 793 first_addr = second_addr = 0; 794 else if (check_addr_range(1, addr_last) < 0) 795 return ERR; 796 GET_COMMAND_SUFFIX(); 797 if (*old_filename == '\0' && *fnp != '!') 798 strcpy(old_filename, fnp); 799#ifdef BACKWARDS 800 if (*fnp == '\0' && *old_filename == '\0') { 801 sprintf(errmsg, "no current filename"); 802 return ERR; 803 } 804#endif 805 if ((addr = write_file(*fnp ? fnp : old_filename, 806 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 807 return ERR; 808 else if (addr == addr_last) 809 modified = 0; 810 else if (modified && !scripted && n == 'q') 811 gflag = EMOD; 812 break; 813 case 'x': 814 if (addr_cnt > 0) { 815 sprintf(errmsg, "unexpected address"); 816 return ERR; 817 } 818 GET_COMMAND_SUFFIX(); 819#ifdef DES 820 des = get_keyword(); 821#else 822 sprintf(errmsg, "crypt unavailable"); 823 return ERR; 824#endif 825 break; 826 case 'z': 827#ifdef BACKWARDS 828 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 829#else 830 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 831#endif 832 return ERR; 833 else if ('0' < *ibufp && *ibufp <= '9') 834 STRTOL(rows, ibufp); 835 GET_COMMAND_SUFFIX(); 836 if (display_lines(second_addr, min(addr_last, 837 second_addr + rows), gflag) < 0) 838 return ERR; 839 gflag = 0; 840 break; 841 case '=': 842 GET_COMMAND_SUFFIX(); 843 printf("%ld\n", addr_cnt ? second_addr : addr_last); 844 break; 845 case '!': 846 if (addr_cnt > 0) { 847 sprintf(errmsg, "unexpected address"); 848 return ERR; 849 } else if ((sflags = get_shell_command()) < 0) 850 return ERR; 851 GET_COMMAND_SUFFIX(); 852 if (sflags) printf("%s\n", shcmd + 1); 853 system(shcmd + 1); 854 if (!scripted) printf("!\n"); 855 break; 856 case '\n': 857#ifdef BACKWARDS 858 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 859#else 860 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 861#endif 862 || display_lines(second_addr, second_addr, 0) < 0) 863 return ERR; 864 break; 865 default: 866 sprintf(errmsg, "unknown command"); 867 return ERR; 868 } 869 return gflag; 870} 871 872 873/* check_addr_range: return status of address range check */ 874int 875check_addr_range(n, m) 876 long n, 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 sprintf(errmsg, "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 */ 894long 895get_matching_node_addr(pat, dir) 896 pattern_t *pat; 897 int dir; 898{ 899 char *s; 900 long n = current_addr; 901 line_t *lp; 902 903 if (!pat) return ERR; 904 do { 905 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { 906 lp = get_addressed_line_node(n); 907 if ((s = get_sbuf_line(lp)) == NULL) 908 return ERR; 909 if (isbinary) 910 NUL_TO_NEWLINE(s, lp->len); 911 if (!regexec(pat, s, 0, NULL, 0)) 912 return n; 913 } 914 } while (n != current_addr); 915 sprintf(errmsg, "no match"); 916 return ERR; 917} 918 919 920/* get_filename: return pointer to copy of filename in the command buffer */ 921char * 922get_filename() 923{ 924 static char *file = NULL; 925 static int filesz = 0; 926 927 int n; 928 929 if (*ibufp != '\n') { 930 SKIP_BLANKS(); 931 if (*ibufp == '\n') { 932 sprintf(errmsg, "invalid filename"); 933 return NULL; 934 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 935 return NULL; 936 else if (*ibufp == '!') { 937 ibufp++; 938 if ((n = get_shell_command()) < 0) 939 return NULL; 940 if (n) printf("%s\n", shcmd + 1); 941 return shcmd; 942 } else if (n - 1 > MAXPATHLEN) { 943 sprintf(errmsg, "filename too long"); 944 return NULL; 945 } 946 } 947#ifndef BACKWARDS 948 else if (*old_filename == '\0') { 949 sprintf(errmsg, "no current filename"); 950 return NULL; 951 } 952#endif 953 REALLOC(file, filesz, MAXPATHLEN + 1, 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 */ 963int 964get_shell_command() 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 sprintf(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 sprintf(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 sprintf(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 */ 1029int 1030append_lines(n) 1031 long n; 1032{ 1033 int l; 1034 char *lp = ibuf; 1035 char *eot; 1036 undo_t *up = NULL; 1037 1038 for (current_addr = n;;) { 1039 if (!isglobal) { 1040 if ((l = get_tty_line()) < 0) 1041 return ERR; 1042 else if (l == 0 || ibuf[l - 1] != '\n') { 1043 clearerr(stdin); 1044 return l ? EOF : 0; 1045 } 1046 lp = ibuf; 1047 } else if (*(lp = ibufp) == '\0') 1048 return 0; 1049 else { 1050 while (*ibufp++ != '\n') 1051 ; 1052 l = ibufp - lp; 1053 } 1054 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1055 return 0; 1056 } 1057 eot = lp + l; 1058 SPL1(); 1059 do { 1060 if ((lp = put_sbuf_line(lp)) == NULL) { 1061 SPL0(); 1062 return ERR; 1063 } else if (up) 1064 up->t = get_addressed_line_node(current_addr); 1065 else if ((up = push_undo_stack(UADD, current_addr, 1066 current_addr)) == NULL) { 1067 SPL0(); 1068 return ERR; 1069 } 1070 } while (lp != eot); 1071 modified = 1; 1072 SPL0(); 1073 } 1074 /* NOTREACHED */ 1075} 1076 1077 1078/* join_lines: replace a range of lines with the joined text of those lines */ 1079int 1080join_lines(from, to) 1081 long from; 1082 long to; 1083{ 1084 static char *buf = NULL; 1085 static int n; 1086 1087 char *s; 1088 int size = 0; 1089 line_t *bp, *ep; 1090 1091 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1092 bp = get_addressed_line_node(from); 1093 for (; bp != ep; bp = bp->q_forw) { 1094 if ((s = get_sbuf_line(bp)) == NULL) 1095 return ERR; 1096 REALLOC(buf, n, size + bp->len, ERR); 1097 memcpy(buf + size, s, bp->len); 1098 size += bp->len; 1099 } 1100 REALLOC(buf, n, size + 2, ERR); 1101 memcpy(buf + size, "\n", 2); 1102 if (delete_lines(from, to) < 0) 1103 return ERR; 1104 current_addr = from - 1; 1105 SPL1(); 1106 if (put_sbuf_line(buf) == NULL || 1107 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1108 SPL0(); 1109 return ERR; 1110 } 1111 modified = 1; 1112 SPL0(); 1113 return 0; 1114} 1115 1116 1117/* move_lines: move a range of lines */ 1118int 1119move_lines(addr) 1120 long addr; 1121{ 1122 line_t *b1, *a1, *b2, *a2; 1123 long n = INC_MOD(second_addr, addr_last); 1124 long p = first_addr - 1; 1125 int done = (addr == first_addr - 1 || addr == second_addr); 1126 1127 SPL1(); 1128 if (done) { 1129 a2 = get_addressed_line_node(n); 1130 b2 = get_addressed_line_node(p); 1131 current_addr = second_addr; 1132 } else if (push_undo_stack(UMOV, p, n) == NULL || 1133 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1134 SPL0(); 1135 return ERR; 1136 } else { 1137 a1 = get_addressed_line_node(n); 1138 if (addr < first_addr) { 1139 b1 = get_addressed_line_node(p); 1140 b2 = get_addressed_line_node(addr); 1141 /* this get_addressed_line_node last! */ 1142 } else { 1143 b2 = get_addressed_line_node(addr); 1144 b1 = get_addressed_line_node(p); 1145 /* this get_addressed_line_node last! */ 1146 } 1147 a2 = b2->q_forw; 1148 REQUE(b2, b1->q_forw); 1149 REQUE(a1->q_back, a2); 1150 REQUE(b1, a1); 1151 current_addr = addr + ((addr < first_addr) ? 1152 second_addr - first_addr + 1 : 0); 1153 } 1154 if (isglobal) 1155 unset_active_nodes(b2->q_forw, a2); 1156 modified = 1; 1157 SPL0(); 1158 return 0; 1159} 1160 1161 1162/* copy_lines: copy a range of lines; return status */ 1163int 1164copy_lines(addr) 1165 long addr; 1166{ 1167 line_t *lp, *np = get_addressed_line_node(first_addr); 1168 undo_t *up = NULL; 1169 long n = second_addr - first_addr + 1; 1170 long m = 0; 1171 1172 current_addr = addr; 1173 if (first_addr <= addr && addr < second_addr) { 1174 n = addr - first_addr + 1; 1175 m = second_addr - addr; 1176 } 1177 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1178 for (; n-- > 0; np = np->q_forw) { 1179 SPL1(); 1180 if ((lp = dup_line_node(np)) == NULL) { 1181 SPL0(); 1182 return ERR; 1183 } 1184 add_line_node(lp); 1185 if (up) 1186 up->t = lp; 1187 else if ((up = push_undo_stack(UADD, current_addr, 1188 current_addr)) == NULL) { 1189 SPL0(); 1190 return ERR; 1191 } 1192 modified = 1; 1193 SPL0(); 1194 } 1195 return 0; 1196} 1197 1198 1199/* delete_lines: delete a range of lines */ 1200int 1201delete_lines(from, to) 1202 long from, to; 1203{ 1204 line_t *n, *p; 1205 1206 SPL1(); 1207 if (push_undo_stack(UDEL, from, to) == NULL) { 1208 SPL0(); 1209 return ERR; 1210 } 1211 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1212 p = get_addressed_line_node(from - 1); 1213 /* this get_addressed_line_node last! */ 1214 if (isglobal) 1215 unset_active_nodes(p->q_forw, n); 1216 REQUE(p, n); 1217 addr_last -= to - from + 1; 1218 current_addr = from - 1; 1219 modified = 1; 1220 SPL0(); 1221 return 0; 1222} 1223 1224 1225/* display_lines: print a range of lines to stdout */ 1226int 1227display_lines(from, to, gflag) 1228 long from; 1229 long to; 1230 int gflag; 1231{ 1232 line_t *bp; 1233 line_t *ep; 1234 char *s; 1235 1236 if (!from) { 1237 sprintf(errmsg, "invalid address"); 1238 return ERR; 1239 } 1240 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1241 bp = get_addressed_line_node(from); 1242 for (; bp != ep; bp = bp->q_forw) { 1243 if ((s = get_sbuf_line(bp)) == NULL) 1244 return ERR; 1245 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1246 return ERR; 1247 } 1248 return 0; 1249} 1250 1251 1252#define MAXMARK 26 /* max number of marks */ 1253 1254line_t *mark[MAXMARK]; /* line markers */ 1255int markno; /* line marker count */ 1256 1257/* mark_line_node: set a line node mark */ 1258int 1259mark_line_node(lp, n) 1260 line_t *lp; 1261 int n; 1262{ 1263 if (!islower(n)) { 1264 sprintf(errmsg, "invalid mark character"); 1265 return ERR; 1266 } else if (mark[n - 'a'] == NULL) 1267 markno++; 1268 mark[n - 'a'] = lp; 1269 return 0; 1270} 1271 1272 1273/* get_marked_node_addr: return address of a marked line */ 1274long 1275get_marked_node_addr(n) 1276 int n; 1277{ 1278 if (!islower(n)) { 1279 sprintf(errmsg, "invalid mark character"); 1280 return ERR; 1281 } 1282 return get_line_node_addr(mark[n - 'a']); 1283} 1284 1285 1286/* unmark_line_node: clear line node mark */ 1287void 1288unmark_line_node(lp) 1289 line_t *lp; 1290{ 1291 int i; 1292 1293 for (i = 0; markno && i < MAXMARK; i++) 1294 if (mark[i] == lp) { 1295 mark[i] = NULL; 1296 markno--; 1297 } 1298} 1299 1300 1301/* dup_line_node: return a pointer to a copy of a line node */ 1302line_t * 1303dup_line_node(lp) 1304 line_t *lp; 1305{ 1306 line_t *np; 1307 1308 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1309 fprintf(stderr, "%s\n", strerror(errno)); 1310 sprintf(errmsg, "out of memory"); 1311 return NULL; 1312 } 1313 np->seek = lp->seek; 1314 np->len = lp->len; 1315 return np; 1316} 1317 1318 1319/* has_trailing_escape: return the parity of escapes preceding a character 1320 in a string */ 1321int 1322has_trailing_escape(s, t) 1323 char *s; 1324 char *t; 1325{ 1326 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1327} 1328 1329 1330/* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ 1331char * 1332strip_escapes(s) 1333 char *s; 1334{ 1335 static char *file = NULL; 1336 static int filesz = 0; 1337 1338 int i = 0; 1339 1340 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 1341 /* assert: no trailing escape */ 1342 while ((file[i++] = (*s == '\\') ? *++s : *s)) 1343 s++; 1344 return file; 1345} 1346 1347 1348void 1349signal_hup(signo) 1350 int signo; 1351{ 1352 if (mutex) 1353 sigflags |= (1 << (signo - 1)); 1354 else handle_hup(signo); 1355} 1356 1357 1358void 1359signal_int(signo) 1360 int signo; 1361{ 1362 if (mutex) 1363 sigflags |= (1 << (signo - 1)); 1364 else handle_int(signo); 1365} 1366 1367 1368void 1369handle_hup(signo) 1370 int signo; 1371{ 1372 char *hup = NULL; /* hup filename */ 1373 char *s; 1374 int n; 1375 1376 if (!sigactive) 1377 quit(1); 1378 sigflags &= ~(1 << (signo - 1)); 1379 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1380 (s = getenv("HOME")) != NULL && 1381 (n = strlen(s)) + 8 <= MAXPATHLEN && /* "ed.hup" + '/' */ 1382 (hup = (char *) malloc(n + 10)) != NULL) { 1383 strcpy(hup, s); 1384 if (hup[n - 1] != '/') 1385 hup[n] = '/', hup[n+1] = '\0'; 1386 strcat(hup, "ed.hup"); 1387 write_file(hup, "w", 1, addr_last); 1388 } 1389 quit(2); 1390} 1391 1392 1393void 1394handle_int(signo) 1395 int signo; 1396{ 1397 if (!sigactive) 1398 quit(1); 1399 sigflags &= ~(1 << (signo - 1)); 1400#ifdef _POSIX_SOURCE 1401 siglongjmp(env, -1); 1402#else 1403 longjmp(env, -1); 1404#endif 1405} 1406 1407 1408int cols = 72; /* wrap column */ 1409 1410void 1411handle_winch(signo) 1412 int signo; 1413{ 1414 struct winsize ws; /* window size structure */ 1415 1416 sigflags &= ~(1 << (signo - 1)); 1417 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1418 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1419 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1420 } 1421} 1422 1423 1424/* is_legal_filename: return a legal filename */ 1425int 1426is_legal_filename(s) 1427 char *s; 1428{ 1429 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1430 sprintf(errmsg, "shell access restricted"); 1431 return 0; 1432 } 1433 return 1; 1434} 1435