main.c
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 /*
38 * CREDITS
39 *
40 * This program is based on the editor algorithm described in
41 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
42 * in Pascal," Addison-Wesley, 1981.
43 *
44 * The buffering algorithm is attributed to Rodney Ruddock of
45 * the University of Guelph, Guelph, Ontario.
46 *
47 * The cbc.c encryption code is adapted from
48 * the bdes program by Matt Bishop of Dartmouth College,
49 * Hanover, NH.
50 *
51 */
52
53 #include <sys/types.h>
54
55 #include <sys/ioctl.h>
56 #include <sys/wait.h>
57 #include <ctype.h>
58 #include <locale.h>
59 #include <pwd.h>
60 #include <setjmp.h>
61
62 #ifdef __APPLE__
63 #include <get_compat.h>
64 #else
65 #define COMPAT_MODE(a,b) (1)
66 #endif /* __APPLE__ */
67
68 #include "ed.h"
69
70
71 #ifdef _POSIX_SOURCE
72 sigjmp_buf env;
73 #else
74 jmp_buf env;
75 #endif
76
77 /* static buffers */
78 char stdinbuf[1]; /* stdin buffer */
79 char *shcmd; /* shell command buffer */
80 int shcmdsz; /* shell command buffer size */
81 int shcmdi; /* shell command buffer index */
82 char *ibuf; /* ed command-line buffer */
83 int ibufsz; /* ed command-line buffer size */
84 char *ibufp; /* pointer to ed command-line buffer */
85
86 /* global flags */
87 int des = 0; /* if set, use crypt(3) for i/o */
88 int garrulous = 0; /* if set, print all error messages */
89 int isbinary; /* if set, buffer contains ASCII NULs */
90 int isglobal; /* if set, doing a global command */
91 int modified; /* if set, buffer modified since last write */
92 int mutex = 0; /* if set, signals set "sigflags" */
93 int red = 0; /* if set, restrict shell/directory access */
94 int scripted = 0; /* if set, suppress diagnostics */
95 int sigflags = 0; /* if set, signals received while mutex set */
96 int sigactive = 0; /* if set, signal handlers are enabled */
97 int posixly_correct = 0; /* if set, POSIX behavior as per */
98 /* http://www.opengroup.org/onlinepubs/009695399/utilities/ed.html */
99
100 char old_filename[PATH_MAX + 1] = ""; /* default filename */
101 long current_addr; /* current address in editor buffer */
102 long addr_last; /* last address in editor buffer */
103 int lineno; /* script line number */
104 const char *prompt; /* command-line prompt */
105 const char *dps = "*"; /* default command-line prompt */
106
107 const char usage[] = "usage: %s [-] [-sx] [-p string] [file]\n";
108
109 /* ed: line editor */
110 int
111 main(int argc, char *argv[])
112 {
113 int c, n;
114 long status = 0;
115 #if __GNUC__
116 /* Avoid longjmp clobbering */
117 (void) &argc;
118 (void) &argv;
119 #endif
120
121 (void)setlocale(LC_ALL, "");
122
123 posixly_correct = COMPAT_MODE("bin/ed", "Unix2003");
124
125 red = argv[0]!=NULL && (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
126 top:
127 while ((c = getopt(argc, argv, "p:sx")) != -1)
128 switch(c) {
129 case 'p': /* set prompt */
130 prompt = optarg;
131 break;
132 case 's': /* run script */
133 scripted = 1;
134 break;
135 case 'x': /* use crypt */
136 #ifdef DES
137 des = get_keyword();
138 #else
139 fprintf(stderr, "crypt unavailable\n?\n");
140 #endif
141 break;
142
143 default:
144 fprintf(stderr, usage, red ? "red" : "ed");
145 exit(1);
146 }
147 argv += optind;
148 argc -= optind;
149 if (argc>0 && *argv && !strcmp(*argv, "-")) {
150 scripted = 1;
151 if (argc > 1) {
152 optind = 1;
153 goto top;
154 }
155 argv++;
156 argc--;
157 }
158 /* assert: reliable signals! */
159 #ifdef SIGWINCH
160 handle_winch(SIGWINCH);
161 if (isatty(0)) signal(SIGWINCH, handle_winch);
162 #endif
163 signal(SIGHUP, signal_hup);
164 signal(SIGQUIT, SIG_IGN);
165 signal(SIGINT, signal_int);
166 #ifdef _POSIX_SOURCE
167 if ((status = sigsetjmp(env, 1)))
168 #else
169 if ((status = setjmp(env)))
170 #endif
171 {
172 fputs("\n?\n", stderr);
173 errmsg = "interrupt";
174 } else {
175 init_buffers();
176 sigactive = 1; /* enable signal handlers */
177 if (argc>0 && *argv && is_legal_filename(*argv)) {
178 if (read_file(*argv, 0) < 0 && !isatty(0))
179 quit(2);
180 else if (**argv != '!') {
181 if (strlen(*argv) < sizeof(old_filename)) {
182 strcpy(old_filename, *argv);
183 } else {
184 fprintf(stderr, "%s: filename too long\n", *argv);
185 quit(2);
186 }
187 }
188 } else if (argc>0) {
189 fputs("?\n", stdout);
190 if (**argv == '\0')
191 errmsg = "invalid filename";
192 if (!isatty(0))
193 quit(2);
194 }
195 }
196 for (;;) {
197 if (status < 0 && garrulous)
198 fprintf(stderr, "%s\n", errmsg);
199 if (prompt) {
200 printf("%s", prompt);
201 fflush(stdout);
202 }
203 if ((n = get_tty_line()) < 0) {
204 status = ERR;
205 continue;
206 } else if (n == 0) {
207 if (modified && !scripted) {
208 fputs("?\n", stderr);
209 errmsg = "warning: file modified";
210 if (!isatty(0)) {
211 fprintf(stderr, garrulous ?
212 "script, line %d: %s\n" :
213 "", lineno, errmsg);
214 quit(2);
215 }
216 clearerr(stdin);
217 modified = 0;
218 status = EMOD;
219 continue;
220 } else
221 quit(0);
222 } else if (ibuf[n - 1] != '\n') {
223 /* discard line */
224 errmsg = "unexpected end-of-file";
225 clearerr(stdin);
226 status = ERR;
227 continue;
228 }
229 isglobal = 0;
230 if ((status = extract_addr_range()) >= 0 &&
231 (status = exec_command()) >= 0)
232 if (!status ||
233 (status = display_lines(current_addr, current_addr,
234 status)) >= 0)
235 continue;
236 switch (status) {
237 case EOF:
238 quit(0);
239 case EMOD:
240 modified = 0;
241 fputs("?\n", stderr); /* give warning */
242 errmsg = "warning: file modified";
243 if (!isatty(0)) {
244 fprintf(stderr, garrulous ?
245 "script, line %d: %s\n" :
246 "", lineno, errmsg);
247 quit(2);
248 }
249 break;
250 case FATAL:
251 if (!isatty(0))
252 fprintf(stderr, garrulous ?
253 "script, line %d: %s\n" : "",
254 lineno, errmsg);
255 else
256 fprintf(stderr, garrulous ? "%s\n" : "",
257 errmsg);
258 quit(3);
259 default:
260 fputs("?\n", stdout);
261 if (!isatty(0)) {
262 fprintf(stderr, garrulous ?
263 "script, line %d: %s\n" : "",
264 lineno, errmsg);
265 quit(2);
266 }
267 break;
268 }
269 }
270 /*NOTREACHED*/
271 }
272
273 long first_addr, second_addr, addr_cnt;
274
275 /* extract_addr_range: get line addresses from the command buffer until an
276 illegal address is seen; return status */
277 int
278 extract_addr_range(void)
279 {
280 long addr;
281
282 addr_cnt = 0;
283 first_addr = second_addr = current_addr;
284 while ((addr = next_addr()) >= 0) {
285 addr_cnt++;
286 first_addr = second_addr;
287 second_addr = addr;
288 if (*ibufp != ',' && *ibufp != ';')
289 break;
290 else if (*ibufp++ == ';')
291 current_addr = addr;
292 }
293 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
294 first_addr = second_addr;
295 return (addr == ERR) ? ERR : 0;
296 }
297
298
299 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
300
301 #define MUST_BE_FIRST() do { \
302 if (!first) { \
303 errmsg = "invalid address"; \
304 return ERR; \
305 } \
306 } while (0);
307
308 /* next_addr: return the next line address in the command buffer */
309 long
310 next_addr(void)
311 {
312 const char *hd;
313 long addr = current_addr;
314 long n;
315 int first = 1;
316 int c;
317 int add = 0;
318
319 SKIP_BLANKS();
320 for (hd = ibufp;; first = 0)
321 switch (c = *ibufp) {
322 case '+':
323 case '\t':
324 case ' ':
325 case '-':
326 case '^':
327 ibufp++;
328 SKIP_BLANKS();
329 if (isdigit((unsigned char)*ibufp)) {
330 STRTOL(n, ibufp);
331 addr += (c == '-' || c == '^') ? -n : n;
332 } else if (!isspace((unsigned char)c))
333 addr += (c == '-' || c == '^') ? -1 : 1;
334 break;
335 case '0': case '1': case '2':
336 case '3': case '4': case '5':
337 case '6': case '7': case '8': case '9':
338 STRTOL(n, ibufp);
339 if (first || !add) /* don't add for ,\d or ;\d */
340 addr = n;
341 else
342 addr += n;
343 break;
344 case '.':
345 case '$':
346 MUST_BE_FIRST();
347 ibufp++;
348 addr = (c == '.') ? current_addr : addr_last;
349 add++;
350 break;
351 case '/':
352 case '?':
353 MUST_BE_FIRST();
354 if ((addr = get_matching_node_addr(
355 get_compiled_pattern(), c == '/')) < 0)
356 return ERR;
357 else if (c == *ibufp)
358 ibufp++;
359 add++;
360 break;
361 case '\'':
362 MUST_BE_FIRST();
363 ibufp++;
364 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
365 return ERR;
366 add++;
367 break;
368 case '%':
369 case ',':
370 case ';':
371 if (first) {
372 ibufp++;
373 addr_cnt++;
374 second_addr = (c == ';') ? current_addr : 1;
375 addr = addr_last;
376 break;
377 }
378 /* FALLTHROUGH */
379 default:
380 if (ibufp == hd)
381 return EOF;
382 else if (addr < 0 || addr_last < addr) {
383 errmsg = "invalid address";
384 return ERR;
385 } else
386 return addr;
387 }
388 /* NOTREACHED */
389 }
390
391
392 /* GET_THIRD_ADDR: get a legal address from the command buffer */
393 #define GET_THIRD_ADDR(addr) \
394 { \
395 long ol1, ol2; \
396 \
397 ol1 = first_addr, ol2 = second_addr; \
398 if (extract_addr_range() < 0) \
399 return ERR; \
400 else if (!posixly_correct && addr_cnt == 0) { \
401 errmsg = "destination expected"; \
402 return ERR; \
403 } else if (second_addr < 0 || addr_last < second_addr) { \
404 errmsg = "invalid address"; \
405 return ERR; \
406 } \
407 addr = second_addr; \
408 first_addr = ol1, second_addr = ol2; \
409 }
410
411
412 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
413 #define GET_COMMAND_SUFFIX() { \
414 int done = 0; \
415 do { \
416 switch(*ibufp) { \
417 case 'p': \
418 gflag |= GPR, ibufp++; \
419 break; \
420 case 'l': \
421 gflag |= GLS, ibufp++; \
422 break; \
423 case 'n': \
424 gflag |= GNP, ibufp++; \
425 break; \
426 default: \
427 done++; \
428 } \
429 } while (!done); \
430 if (*ibufp++ != '\n') { \
431 errmsg = "invalid command suffix"; \
432 return ERR; \
433 } \
434 }
435
436
437 /* sflags */
438 #define SGG 001 /* complement previous global substitute suffix */
439 #define SGP 002 /* complement previous print suffix */
440 #define SGR 004 /* use last regex instead of last pat */
441 #define SGF 010 /* repeat last substitution */
442
443 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
444
445 long rows = 22; /* scroll length: ws_row - 2 */
446
447 /* exec_command: execute the next command in command buffer; return print
448 request, if any */
449 int
450 exec_command(void)
451 {
452 static pattern_t *pat = NULL;
453 static int sgflag = 0;
454 static long sgnum = 0;
455
456 pattern_t *tpat;
457 char *fnp;
458 int gflag = 0;
459 int sflags = 0;
460 long addr = 0;
461 int n = 0;
462 int c;
463
464 SKIP_BLANKS();
465 switch(c = *ibufp++) {
466 case 'a':
467 GET_COMMAND_SUFFIX();
468 if (!isglobal) clear_undo_stack();
469 if (append_lines(second_addr) < 0)
470 return ERR;
471 break;
472 case 'c':
473 if (first_addr == 0)
474 first_addr = 1;
475 if (check_addr_range(current_addr, current_addr) < 0)
476 return ERR;
477 GET_COMMAND_SUFFIX();
478 if (!isglobal) clear_undo_stack();
479 if (delete_lines(first_addr, second_addr) < 0 ||
480 append_lines(current_addr) < 0)
481 return ERR;
482 if (current_addr == 0 && addr_last != 0)
483 current_addr = 1;
484 break;
485 case 'd':
486 if (check_addr_range(current_addr, current_addr) < 0)
487 return ERR;
488 GET_COMMAND_SUFFIX();
489 if (!isglobal) clear_undo_stack();
490 if (delete_lines(first_addr, second_addr) < 0)
491 return ERR;
492 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
493 current_addr = addr;
494 if (current_addr == 0 && addr_last != 0)
495 current_addr = 1;
496 break;
497 case 'e':
498 if (modified && !scripted)
499 return EMOD;
500 /* FALLTHROUGH */
501 case 'E':
502 if (addr_cnt > 0) {
503 errmsg = "unexpected address";
504 return ERR;
505 } else if (!isspace((unsigned char)*ibufp)) {
506 errmsg = "unexpected command suffix";
507 return ERR;
508 } else if ((fnp = get_filename()) == NULL)
509 return ERR;
510 GET_COMMAND_SUFFIX();
511 if (delete_lines(1, addr_last) < 0)
512 return ERR;
513 clear_undo_stack();
514 if (close_sbuf() < 0)
515 return ERR;
516 else if (open_sbuf() < 0)
517 return FATAL;
518 if (*fnp && *fnp != '!') {
519 if (strlen(fnp) < sizeof(old_filename)) {
520 strcpy(old_filename, fnp);
521 } else {
522 fprintf(stderr, "%s: filename too long\n", fnp);
523 quit(2);
524 }
525 }
526
527 if (!posixly_correct && *fnp == '\0' && *old_filename == '\0') {
528 errmsg = "no current filename";
529 return ERR;
530 }
531 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
532 return ERR;
533 clear_undo_stack();
534 modified = 0;
535 u_current_addr = u_addr_last = -1;
536 break;
537 case 'f':
538 if (addr_cnt > 0) {
539 errmsg = "unexpected address";
540 return ERR;
541 } else if (!isspace((unsigned char)*ibufp)) {
542 errmsg = "unexpected command suffix";
543 return ERR;
544 } else if ((fnp = get_filename()) == NULL)
545 return ERR;
546 else if (*fnp == '!') {
547 errmsg = "invalid redirection";
548 return ERR;
549 }
550 GET_COMMAND_SUFFIX();
551 if (*fnp) {
552 if (strlen(fnp) < sizeof(old_filename)) {
553 strcpy(old_filename, fnp);
554 } else {
555 fprintf(stderr, "%s: filename too long\n", fnp);
556 quit(2);
557 }
558 }
559 printf("%s\n", strip_escapes(old_filename));
560 break;
561 case 'g':
562 case 'v':
563 case 'G':
564 case 'V':
565 if (isglobal) {
566 errmsg = "cannot nest global commands";
567 return ERR;
568 } else if (check_addr_range(1, addr_last) < 0)
569 return ERR;
570 else if (build_active_list(c == 'g' || c == 'G') < 0)
571 return ERR;
572 else if ((n = (c == 'G' || c == 'V')))
573 GET_COMMAND_SUFFIX();
574 isglobal++;
575 n = exec_global(n, gflag);
576 if (n == EOF)
577 return EOF;
578 else if (n < 0)
579 return ERR;
580 break;
581 case 'h':
582 if (addr_cnt > 0) {
583 errmsg = "unexpected address";
584 return ERR;
585 }
586 GET_COMMAND_SUFFIX();
587 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
588 break;
589 case 'H':
590 if (addr_cnt > 0) {
591 errmsg = "unexpected address";
592 return ERR;
593 }
594 GET_COMMAND_SUFFIX();
595 if ((garrulous = 1 - garrulous) && *errmsg)
596 fprintf(stderr, "%s\n", errmsg);
597 break;
598 case 'i':
599 if (second_addr == 0) {
600 second_addr = 1;
601 }
602 GET_COMMAND_SUFFIX();
603 if (!isglobal) clear_undo_stack();
604 if (append_lines(second_addr - 1) < 0)
605 return ERR;
606 if (u_addr_last == addr_last) /* nothing inserted */
607 current_addr = second_addr;
608 break;
609 case 'j':
610 if (check_addr_range(current_addr, current_addr + 1) < 0)
611 return ERR;
612 GET_COMMAND_SUFFIX();
613 if (!isglobal) clear_undo_stack();
614 if (first_addr != second_addr &&
615 join_lines(first_addr, second_addr) < 0)
616 return ERR;
617 break;
618 case 'k':
619 c = *ibufp++;
620 if (second_addr == 0) {
621 errmsg = "invalid address";
622 return ERR;
623 }
624 GET_COMMAND_SUFFIX();
625 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
626 return ERR;
627 break;
628 case 'l':
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 | GLS) < 0)
633 return ERR;
634 gflag = 0;
635 break;
636 case 'm':
637 if (check_addr_range(current_addr, current_addr) < 0)
638 return ERR;
639 GET_THIRD_ADDR(addr);
640 if (first_addr <= addr && addr < second_addr) {
641 errmsg = "invalid destination";
642 return ERR;
643 }
644 GET_COMMAND_SUFFIX();
645 if (!isglobal) clear_undo_stack();
646 if (move_lines(addr) < 0)
647 return ERR;
648 break;
649 case 'n':
650 if (check_addr_range(current_addr, current_addr) < 0)
651 return ERR;
652 GET_COMMAND_SUFFIX();
653 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
654 return ERR;
655 gflag = 0;
656 break;
657 case 'p':
658 if (check_addr_range(current_addr, current_addr) < 0)
659 return ERR;
660 GET_COMMAND_SUFFIX();
661 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
662 return ERR;
663 gflag = 0;
664 break;
665 case 'P':
666 if (addr_cnt > 0) {
667 errmsg = "unexpected address";
668 return ERR;
669 }
670 GET_COMMAND_SUFFIX();
671 prompt = prompt ? NULL : optarg ? optarg : dps;
672 break;
673 case 'q':
674 case 'Q':
675 if (addr_cnt > 0) {
676 errmsg = "unexpected address";
677 return ERR;
678 }
679 GET_COMMAND_SUFFIX();
680 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
681 break;
682 case 'r':
683 if (!isspace((unsigned char)*ibufp)) {
684 errmsg = "unexpected command suffix";
685 return ERR;
686 } else if (addr_cnt == 0)
687 second_addr = addr_last;
688 if ((fnp = get_filename()) == NULL)
689 return ERR;
690 GET_COMMAND_SUFFIX();
691 if (!isglobal) clear_undo_stack();
692 if (*old_filename == '\0' && *fnp != '!') {
693 if (strlen(fnp) < sizeof(old_filename)) {
694 strcpy(old_filename, fnp);
695 } else {
696 fprintf(stderr, "%s: filename too long\n", fnp);
697 quit(2);
698 }
699 }
700 if (!posixly_correct && *fnp == '\0' && *old_filename == '\0') {
701 errmsg = "no current filename";
702 return ERR;
703 }
704 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
705 return ERR;
706 else if (addr && addr != addr_last)
707 modified = 1;
708 break;
709 case 's':
710 /*
711 * POSIX requires ed to process srabcr123r as
712 * replace abc with 123 delimiter='r'
713 */
714 if (!posixly_correct) do {
715 switch(*ibufp) {
716 case '\n':
717 sflags |=SGF;
718 break;
719 case 'g':
720 sflags |= SGG;
721 ibufp++;
722 break;
723 case 'p':
724 sflags |= SGP;
725 ibufp++;
726 break;
727 case 'r':
728 sflags |= SGR;
729 ibufp++;
730 break;
731 case '0': case '1': case '2': case '3': case '4':
732 case '5': case '6': case '7': case '8': case '9':
733 STRTOL(sgnum, ibufp);
734 sflags |= SGF;
735 sgflag &= ~GSG; /* override GSG */
736 break;
737 default:
738 if (sflags) {
739 errmsg = "invalid command suffix";
740 return ERR;
741 }
742 }
743 } while (sflags && *ibufp != '\n');
744 if (sflags && !pat) {
745 errmsg = "no previous substitution";
746 return ERR;
747 } else if (sflags & SGG)
748 sgnum = 0; /* override numeric arg */
749 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
750 errmsg = "invalid pattern delimiter";
751 return ERR;
752 }
753 tpat = pat;
754 SPL1();
755 if ((!sflags || (sflags & SGR)) &&
756 (tpat = get_compiled_pattern()) == NULL) {
757 SPL0();
758 return ERR;
759 } else if (tpat != pat) {
760 if (pat) {
761 regfree(pat);
762 free(pat);
763 }
764 pat = tpat;
765 patlock = 1; /* reserve pattern */
766 }
767 SPL0();
768 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
769 return ERR;
770 else if (isglobal)
771 sgflag |= GLB;
772 else
773 sgflag &= ~GLB;
774 if (sflags & SGG)
775 sgflag ^= GSG;
776 if (sflags & SGP)
777 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
778 do {
779 switch(*ibufp) {
780 case 'p':
781 sgflag |= GPR, ibufp++;
782 break;
783 case 'l':
784 sgflag |= GLS, ibufp++;
785 break;
786 case 'n':
787 sgflag |= GNP, ibufp++;
788 break;
789 default:
790 n++;
791 }
792 } while (!n);
793 if (check_addr_range(current_addr, current_addr) < 0)
794 return ERR;
795 GET_COMMAND_SUFFIX();
796 if (!isglobal) clear_undo_stack();
797 if (search_and_replace(pat, sgflag, sgnum) < 0)
798 return ERR;
799 break;
800 case 't':
801 if (check_addr_range(current_addr, current_addr) < 0)
802 return ERR;
803 GET_THIRD_ADDR(addr);
804 GET_COMMAND_SUFFIX();
805 if (!isglobal) clear_undo_stack();
806 if (copy_lines(addr) < 0)
807 return ERR;
808 break;
809 case 'u':
810 if (addr_cnt > 0) {
811 errmsg = "unexpected address";
812 return ERR;
813 }
814 GET_COMMAND_SUFFIX();
815 if (pop_undo_stack() < 0)
816 return ERR;
817 break;
818 case 'w':
819 case 'W':
820 if ((n = *ibufp) == 'q' || n == 'Q') {
821 gflag = EOF;
822 ibufp++;
823 }
824 if (!isspace((unsigned char)*ibufp)) {
825 errmsg = "unexpected command suffix";
826 return ERR;
827 } else if ((fnp = get_filename()) == NULL)
828 return ERR;
829 if (addr_cnt == 0 && !addr_last)
830 first_addr = second_addr = 0;
831 else if (check_addr_range(1, addr_last) < 0)
832 return ERR;
833 GET_COMMAND_SUFFIX();
834 if (*old_filename == '\0' && *fnp != '!') {
835 if (strlen(fnp) < sizeof(old_filename)) {
836 strcpy(old_filename, fnp);
837 } else {
838 fprintf(stderr, "%s: filename too long\n", fnp);
839 quit(2);
840 }
841 }
842 if (!posixly_correct && *fnp == '\0' && *old_filename == '\0') {
843 errmsg = "no current filename";
844 return ERR;
845 }
846 if ((addr = write_file(*fnp ? fnp : old_filename,
847 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
848 return ERR;
849 else if (addr == addr_last)
850 modified = 0;
851 else if (modified && !scripted && n == 'q')
852 gflag = EMOD;
853 break;
854 case 'x':
855 if (addr_cnt > 0) {
856 errmsg = "unexpected address";
857 return ERR;
858 }
859 GET_COMMAND_SUFFIX();
860 #ifdef DES
861 des = get_keyword();
862 break;
863 #else
864 errmsg = "crypt unavailable";
865 return ERR;
866 #endif
867 case 'z':
868 if (check_addr_range(first_addr = 1, current_addr + (posixly_correct ? !isglobal : 1)) < 0)
869 return ERR;
870 else if ('0' < *ibufp && *ibufp <= '9')
871 STRTOL(rows, ibufp);
872 GET_COMMAND_SUFFIX();
873 if (display_lines(second_addr, min(addr_last,
874 second_addr + rows), gflag) < 0)
875 return ERR;
876 gflag = 0;
877 break;
878 case '=':
879 GET_COMMAND_SUFFIX();
880 printf("%ld\n", addr_cnt ? second_addr : addr_last);
881 break;
882 case '!':
883 if (addr_cnt > 0) {
884 errmsg = "unexpected address";
885 return ERR;
886 } else if ((sflags = get_shell_command()) < 0)
887 return ERR;
888 GET_COMMAND_SUFFIX();
889 if (sflags) printf("%s\n", shcmd + 1);
890 fflush(stdout);
891 system(shcmd + 1);
892 if (!scripted) printf("!\n");
893 break;
894 case '\n':
895 if (check_addr_range(first_addr = 1, current_addr + (posixly_correct ? !isglobal : 1)) < 0
896 || display_lines(second_addr, second_addr, 0) < 0)
897 return ERR;
898 break;
899 default:
900 errmsg = "unknown command";
901 return ERR;
902 }
903 return gflag;
904 }
905
906
907 /* check_addr_range: return status of address range check */
908 int
909 check_addr_range(long n, long m)
910 {
911 if (addr_cnt == 0) {
912 first_addr = n;
913 second_addr = m;
914 }
915 if (first_addr > second_addr || 1 > first_addr ||
916 second_addr > addr_last) {
917 errmsg = "invalid address";
918 return ERR;
919 }
920 return 0;
921 }
922
923
924 /* get_matching_node_addr: return the address of the next line matching a
925 pattern in a given direction. wrap around begin/end of editor buffer if
926 necessary */
927 long
928 get_matching_node_addr(pattern_t *pat, int dir)
929 {
930 char *s;
931 long n = current_addr;
932 line_t *lp;
933
934 if (!pat) return ERR;
935 do {
936 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
937 lp = get_addressed_line_node(n);
938 if ((s = get_sbuf_line(lp)) == NULL)
939 return ERR;
940 if (isbinary)
941 NUL_TO_NEWLINE(s, lp->len);
942 if (!regexec(pat, s, 0, NULL, 0))
943 return n;
944 }
945 } while (n != current_addr);
946 errmsg = "no match";
947 return ERR;
948 }
949
950
951 /* get_filename: return pointer to copy of filename in the command buffer */
952 char *
953 get_filename(void)
954 {
955 static char *file = NULL;
956 static int filesz = 0;
957
958 int n;
959
960 if (*ibufp != '\n') {
961 SKIP_BLANKS();
962 if (*ibufp == '\n') {
963 errmsg = "invalid filename";
964 return NULL;
965 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
966 return NULL;
967 else if (*ibufp == '!') {
968 ibufp++;
969 if ((n = get_shell_command()) < 0)
970 return NULL;
971 if (n)
972 printf("%s\n", shcmd + 1);
973 return shcmd;
974 } else if (n > PATH_MAX) {
975 errmsg = "filename too long";
976 return NULL;
977 }
978 }
979 else if (posixly_correct && *old_filename == '\0') {
980 errmsg = "no current filename";
981 return NULL;
982 }
983 REALLOC(file, filesz, PATH_MAX + 1, NULL);
984 for (n = 0; *ibufp != '\n';)
985 file[n++] = *ibufp++;
986 file[n] = '\0';
987 return is_legal_filename(file) ? file : NULL;
988 }
989
990
991 /* get_shell_command: read a shell command from stdin; return substitution
992 status */
993 int
994 get_shell_command(void)
995 {
996 static char *buf = NULL;
997 static int n = 0;
998
999 char *s; /* substitution char pointer */
1000 int i = 0;
1001 int j = 0;
1002
1003 if (red) {
1004 errmsg = "shell access restricted";
1005 return ERR;
1006 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
1007 return ERR;
1008 REALLOC(buf, n, j + 1, ERR);
1009 buf[i++] = '!'; /* prefix command w/ bang */
1010 while (*ibufp != '\n')
1011 switch (*ibufp) {
1012 default:
1013 REALLOC(buf, n, i + 2, ERR);
1014 buf[i++] = *ibufp;
1015 if (*ibufp++ == '\\')
1016 buf[i++] = *ibufp++;
1017 break;
1018 case '!':
1019 if (s != ibufp) {
1020 REALLOC(buf, n, i + 1, ERR);
1021 buf[i++] = *ibufp++;
1022 }
1023 else if (shcmd == NULL || (!posixly_correct && *(shcmd + 1) == '\0'))
1024 {
1025 errmsg = "no previous command";
1026 return ERR;
1027 } else {
1028 REALLOC(buf, n, i + shcmdi, ERR);
1029 for (s = shcmd + 1; s < shcmd + shcmdi;)
1030 buf[i++] = *s++;
1031 s = ibufp++;
1032 }
1033 break;
1034 case '%':
1035 if (*old_filename == '\0') {
1036 errmsg = "no current filename";
1037 return ERR;
1038 }
1039 j = strlen(s = strip_escapes(old_filename));
1040 REALLOC(buf, n, i + j, ERR);
1041 while (j--)
1042 buf[i++] = *s++;
1043 s = ibufp++;
1044 break;
1045 }
1046 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1047 memcpy(shcmd, buf, i);
1048 shcmd[shcmdi = i] = '\0';
1049 return *s == '!' || *s == '%';
1050 }
1051
1052
1053 /* append_lines: insert text from stdin to after line n; stop when either a
1054 single period is read or EOF; return status */
1055 int
1056 append_lines(long n)
1057 {
1058 int l;
1059 const char *lp = ibuf;
1060 const char *eot;
1061 undo_t *up = NULL;
1062
1063 for (current_addr = n;;) {
1064 if (!isglobal) {
1065 if ((l = get_tty_line()) < 0)
1066 return ERR;
1067 else if (l == 0 || ibuf[l - 1] != '\n') {
1068 clearerr(stdin);
1069 return l ? EOF : 0;
1070 }
1071 lp = ibuf;
1072 } else if (*(lp = ibufp) == '\0')
1073 return 0;
1074 else {
1075 while (*ibufp++ != '\n')
1076 ;
1077 l = ibufp - lp;
1078 }
1079 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1080 return 0;
1081 }
1082 eot = lp + l;
1083 SPL1();
1084 do {
1085 if ((lp = put_sbuf_line(lp)) == NULL) {
1086 SPL0();
1087 return ERR;
1088 } else if (up)
1089 up->t = get_addressed_line_node(current_addr);
1090 else if ((up = push_undo_stack(UADD, current_addr,
1091 current_addr)) == NULL) {
1092 SPL0();
1093 return ERR;
1094 }
1095 } while (lp != eot);
1096 modified = 1;
1097 SPL0();
1098 }
1099 /* NOTREACHED */
1100 }
1101
1102
1103 /* join_lines: replace a range of lines with the joined text of those lines */
1104 int
1105 join_lines(long from, long to)
1106 {
1107 static char *buf = NULL;
1108 static int n;
1109
1110 char *s;
1111 int size = 0;
1112 line_t *bp, *ep;
1113
1114 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1115 bp = get_addressed_line_node(from);
1116 for (; bp != ep; bp = bp->q_forw) {
1117 if ((s = get_sbuf_line(bp)) == NULL)
1118 return ERR;
1119 REALLOC(buf, n, size + bp->len, ERR);
1120 memcpy(buf + size, s, bp->len);
1121 size += bp->len;
1122 }
1123 REALLOC(buf, n, size + 2, ERR);
1124 memcpy(buf + size, "\n", 2);
1125 if (delete_lines(from, to) < 0)
1126 return ERR;
1127 current_addr = from - 1;
1128 SPL1();
1129 if (put_sbuf_line(buf) == NULL ||
1130 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1131 SPL0();
1132 return ERR;
1133 }
1134 modified = 1;
1135 if (current_addr == 0)
1136 current_addr = 1;
1137 SPL0();
1138 return 0;
1139 }
1140
1141
1142 /* move_lines: move a range of lines */
1143 int
1144 move_lines(long addr)
1145 {
1146 line_t *b1, *a1, *b2, *a2;
1147 long n = INC_MOD(second_addr, addr_last);
1148 long p = first_addr - 1;
1149 int done = (addr == first_addr - 1 || addr == second_addr);
1150
1151 SPL1();
1152 if (done) {
1153 a2 = get_addressed_line_node(n);
1154 b2 = get_addressed_line_node(p);
1155 current_addr = second_addr;
1156 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1157 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1158 SPL0();
1159 return ERR;
1160 } else {
1161 a1 = get_addressed_line_node(n);
1162 if (addr < first_addr) {
1163 b1 = get_addressed_line_node(p);
1164 b2 = get_addressed_line_node(addr);
1165 /* this get_addressed_line_node last! */
1166 } else {
1167 b2 = get_addressed_line_node(addr);
1168 b1 = get_addressed_line_node(p);
1169 /* this get_addressed_line_node last! */
1170 }
1171 a2 = b2->q_forw;
1172 REQUE(b2, b1->q_forw);
1173 REQUE(a1->q_back, a2);
1174 REQUE(b1, a1);
1175 current_addr = addr + ((addr < first_addr) ?
1176 second_addr - first_addr + 1 : 0);
1177 }
1178 if (isglobal)
1179 unset_active_nodes(b2->q_forw, a2);
1180 modified = 1;
1181 SPL0();
1182 return 0;
1183 }
1184
1185
1186 /* copy_lines: copy a range of lines; return status */
1187 int
1188 copy_lines(long addr)
1189 {
1190 line_t *lp, *np = get_addressed_line_node(first_addr);
1191 undo_t *up = NULL;
1192 long n = second_addr - first_addr + 1;
1193 long m = 0;
1194
1195 current_addr = addr;
1196 if (first_addr <= addr && addr < second_addr) {
1197 n = addr - first_addr + 1;
1198 m = second_addr - addr;
1199 }
1200 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1201 for (; n-- > 0; np = np->q_forw) {
1202 SPL1();
1203 if ((lp = dup_line_node(np)) == NULL) {
1204 SPL0();
1205 return ERR;
1206 }
1207 add_line_node(lp);
1208 if (up)
1209 up->t = lp;
1210 else if ((up = push_undo_stack(UADD, current_addr,
1211 current_addr)) == NULL) {
1212 SPL0();
1213 return ERR;
1214 }
1215 modified = 1;
1216 SPL0();
1217 }
1218 return 0;
1219 }
1220
1221
1222 /* delete_lines: delete a range of lines */
1223 int
1224 delete_lines(long from, long to)
1225 {
1226 line_t *n, *p;
1227
1228 SPL1();
1229 if (push_undo_stack(UDEL, from, to) == NULL) {
1230 SPL0();
1231 return ERR;
1232 }
1233 n = get_addressed_line_node(INC_MOD(to, addr_last));
1234 p = get_addressed_line_node(from - 1);
1235 /* this get_addressed_line_node last! */
1236 if (isglobal)
1237 unset_active_nodes(p->q_forw, n);
1238 REQUE(p, n);
1239 addr_last -= to - from + 1;
1240 current_addr = from - 1;
1241 modified = 1;
1242 SPL0();
1243 return 0;
1244 }
1245
1246
1247 /* display_lines: print a range of lines to stdout */
1248 int
1249 display_lines(long from, long to, int gflag)
1250 {
1251 line_t *bp;
1252 line_t *ep;
1253 char *s;
1254
1255 if (!from) {
1256 errmsg = "invalid address";
1257 return ERR;
1258 }
1259 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1260 bp = get_addressed_line_node(from);
1261 for (; bp != ep; bp = bp->q_forw) {
1262 if ((s = get_sbuf_line(bp)) == NULL)
1263 return ERR;
1264 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1265 return ERR;
1266 }
1267 return 0;
1268 }
1269
1270
1271 #define MAXMARK 26 /* max number of marks */
1272
1273 line_t *mark[MAXMARK]; /* line markers */
1274 int markno; /* line marker count */
1275
1276 /* mark_line_node: set a line node mark */
1277 int
1278 mark_line_node(line_t *lp, int n)
1279 {
1280 if (!islower((unsigned char)n)) {
1281 errmsg = "invalid mark character";
1282 return ERR;
1283 } else if (mark[n - 'a'] == NULL)
1284 markno++;
1285 mark[n - 'a'] = lp;
1286 return 0;
1287 }
1288
1289
1290 /* get_marked_node_addr: return address of a marked line */
1291 long
1292 get_marked_node_addr(int n)
1293 {
1294 if (!islower((unsigned char)n)) {
1295 errmsg = "invalid mark character";
1296 return ERR;
1297 }
1298 return get_line_node_addr(mark[n - 'a']);
1299 }
1300
1301 /* Used by search and replace */
1302 void
1303 replace_marks(line_t *old, line_t *new)
1304 {
1305 int i;
1306 for (i=0; markno && i<MAXMARK; i++)
1307 if (mark[i] == old)
1308 mark[i] = new;
1309 }
1310
1311
1312 /* unmark_line_node: clear line node mark */
1313 void
1314 unmark_line_node(line_t *lp)
1315 {
1316 int i;
1317
1318 for (i = 0; markno && i < MAXMARK; i++)
1319 if (mark[i] == lp) {
1320 mark[i] = NULL;
1321 markno--;
1322 }
1323 }
1324
1325
1326 /* dup_line_node: return a pointer to a copy of a line node */
1327 line_t *
1328 dup_line_node(line_t *lp)
1329 {
1330 line_t *np;
1331
1332 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1333 fprintf(stderr, "%s\n", strerror(errno));
1334 errmsg = "out of memory";
1335 return NULL;
1336 }
1337 np->seek = lp->seek;
1338 np->len = lp->len;
1339 return np;
1340 }
1341
1342
1343 /* has_trailing_escape: return the parity of escapes preceding a character
1344 in a string */
1345 int
1346 has_trailing_escape(char *s, char *t)
1347 {
1348 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1349 }
1350
1351
1352 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1353 char *
1354 strip_escapes(char *s)
1355 {
1356 static char *file = NULL;
1357 static int filesz = 0;
1358
1359 int i = 0;
1360
1361 REALLOC(file, filesz, PATH_MAX, NULL);
1362 while (i < filesz - 1 /* Worry about a possible trailing escape */
1363 && (file[i++] = (*s == '\\') ? *++s : *s))
1364 s++;
1365 return file;
1366 }
1367
1368
1369 void
1370 signal_hup(int signo)
1371 {
1372 if (mutex)
1373 sigflags |= (1 << (signo - 1));
1374 else
1375 handle_hup(signo);
1376 }
1377
1378
1379 void
1380 signal_int(int signo)
1381 {
1382 if (mutex)
1383 sigflags |= (1 << (signo - 1));
1384 else
1385 handle_int(signo);
1386 }
1387
1388
1389 void
1390 handle_hup(int signo)
1391 {
1392 char *hup = NULL; /* hup filename */
1393 char *s;
1394 char ed_hup[] = "ed.hup";
1395 int n;
1396
1397 if (!sigactive)
1398 quit(1);
1399 sigflags &= ~(1 << (signo - 1));
1400 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 &&
1401 (s = getenv("HOME")) != NULL &&
1402 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */
1403 (hup = (char *) malloc(n + 10)) != NULL) {
1404 strcpy(hup, s);
1405 if (hup[n - 1] != '/')
1406 hup[n] = '/', hup[n+1] = '\0';
1407 strcat(hup, "ed.hup");
1408 write_file(hup, "w", 1, addr_last);
1409 }
1410 quit(2);
1411 }
1412
1413
1414 void
1415 handle_int(int signo)
1416 {
1417 if (!sigactive)
1418 quit(1);
1419 sigflags &= ~(1 << (signo - 1));
1420 #ifdef _POSIX_SOURCE
1421 siglongjmp(env, -1);
1422 #else
1423 longjmp(env, -1);
1424 #endif
1425 }
1426
1427
1428 int cols = 72; /* wrap column */
1429
1430 void
1431 handle_winch(int signo)
1432 {
1433 int save_errno = errno;
1434
1435 struct winsize ws; /* window size structure */
1436
1437 sigflags &= ~(1 << (signo - 1));
1438 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1439 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1440 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1441 }
1442 errno = save_errno;
1443 }
1444
1445
1446 /* is_legal_filename: return a legal filename */
1447 int
1448 is_legal_filename(char *s)
1449 {
1450 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1451 errmsg = "shell access restricted";
1452 return 0;
1453 }
1454 return 1;
1455 }
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