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
31static const char copyright[] =
32"@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\
33 All rights reserved.\n";
34#endif
35#endif /* not lint */
36
37#include <sys/cdefs.h>
| 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
31static const char copyright[] =
32"@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\
33 All rights reserved.\n";
34#endif
35#endif /* not lint */
36
37#include <sys/cdefs.h>
|
38__FBSDID("$FreeBSD: head/bin/ed/main.c 114433 2003-05-01 16:58:57Z obrien $");
| 38__FBSDID("$FreeBSD: head/bin/ed/main.c 140344 2005-01-16 11:10:21Z charnier $");
|
39
40/*
41 * CREDITS
42 *
43 * This program is based on the editor algorithm described in
44 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
45 * in Pascal," Addison-Wesley, 1981.
46 *
47 * The buffering algorithm is attributed to Rodney Ruddock of
48 * the University of Guelph, Guelph, Ontario.
49 *
50 * The cbc.c encryption code is adapted from
51 * the bdes program by Matt Bishop of Dartmouth College,
52 * Hanover, NH.
53 *
54 */
55
56#include <sys/types.h>
57
58#include <sys/ioctl.h>
59#include <sys/wait.h>
60#include <ctype.h>
61#include <locale.h>
62#include <pwd.h>
63#include <setjmp.h>
64
65#include "ed.h"
66
67
68#ifdef _POSIX_SOURCE
69sigjmp_buf env;
70#else
71jmp_buf env;
72#endif
73
74/* static buffers */
75char stdinbuf[1]; /* stdin buffer */
76char *shcmd; /* shell command buffer */
77int shcmdsz; /* shell command buffer size */
78int shcmdi; /* shell command buffer index */
79char *ibuf; /* ed command-line buffer */
80int ibufsz; /* ed command-line buffer size */
81char *ibufp; /* pointer to ed command-line buffer */
82
83/* global flags */
84int des = 0; /* if set, use crypt(3) for i/o */
85int garrulous = 0; /* if set, print all error messages */
86int isbinary; /* if set, buffer contains ASCII NULs */
87int isglobal; /* if set, doing a global command */
88int modified; /* if set, buffer modified since last write */
89int mutex = 0; /* if set, signals set "sigflags" */
90int red = 0; /* if set, restrict shell/directory access */
91int scripted = 0; /* if set, suppress diagnostics */
92int sigflags = 0; /* if set, signals received while mutex set */
93int sigactive = 0; /* if set, signal handlers are enabled */
94
95char old_filename[PATH_MAX] = ""; /* default filename */
96long current_addr; /* current address in editor buffer */
97long addr_last; /* last address in editor buffer */
98int lineno; /* script line number */
99const char *prompt; /* command-line prompt */
100const char *dps = "*"; /* default command-line prompt */
101
102const char usage[] = "usage: %s [-] [-sx] [-p string] [name]\n";
103
104/* ed: line editor */
105int
106main(int argc, char *argv[])
107{
108 int c, n;
109 long status = 0;
110#if __GNUC__
111 /* Avoid longjmp clobbering */
112 (void) &argc;
113 (void) &argv;
114#endif
115
116 (void)setlocale(LC_ALL, "");
117
118 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
119top:
120 while ((c = getopt(argc, argv, "p:sx")) != -1)
121 switch(c) {
122 case 'p': /* set prompt */
123 prompt = optarg;
124 break;
125 case 's': /* run script */
126 scripted = 1;
127 break;
128 case 'x': /* use crypt */
129#ifdef DES
130 des = get_keyword();
131#else
132 fprintf(stderr, "crypt unavailable\n?\n");
133#endif
134 break;
135
136 default:
137 fprintf(stderr, usage, argv[0]);
138 exit(1);
139 }
140 argv += optind;
141 argc -= optind;
142 if (argc && **argv == '-') {
143 scripted = 1;
144 if (argc > 1) {
145 optind = 1;
146 goto top;
147 }
148 argv++;
149 argc--;
150 }
151 /* assert: reliable signals! */
152#ifdef SIGWINCH
153 handle_winch(SIGWINCH);
154 if (isatty(0)) signal(SIGWINCH, handle_winch);
155#endif
156 signal(SIGHUP, signal_hup);
157 signal(SIGQUIT, SIG_IGN);
158 signal(SIGINT, signal_int);
159#ifdef _POSIX_SOURCE
160 if ((status = sigsetjmp(env, 1)))
161#else
162 if ((status = setjmp(env)))
163#endif
164 {
165 fputs("\n?\n", stderr);
166 errmsg = "interrupt";
167 } else {
168 init_buffers();
169 sigactive = 1; /* enable signal handlers */
170 if (argc && **argv && is_legal_filename(*argv)) {
171 if (read_file(*argv, 0) < 0 && !isatty(0))
172 quit(2);
173 else if (**argv != '!')
174 if (strlcpy(old_filename, *argv, sizeof(old_filename))
175 >= sizeof(old_filename))
176 quit(2);
177 } else if (argc) {
178 fputs("?\n", stderr);
179 if (**argv == '\0')
180 errmsg = "invalid filename";
181 if (!isatty(0))
182 quit(2);
183 }
184 }
185 for (;;) {
186 if (status < 0 && garrulous)
187 fprintf(stderr, "%s\n", errmsg);
188 if (prompt) {
189 printf("%s", prompt);
190 fflush(stdout);
191 }
192 if ((n = get_tty_line()) < 0) {
193 status = ERR;
194 continue;
195 } else if (n == 0) {
196 if (modified && !scripted) {
197 fputs("?\n", stderr);
198 errmsg = "warning: file modified";
199 if (!isatty(0)) {
200 fprintf(stderr, garrulous ?
201 "script, line %d: %s\n" :
202 "", lineno, errmsg);
203 quit(2);
204 }
205 clearerr(stdin);
206 modified = 0;
207 status = EMOD;
208 continue;
209 } else
210 quit(0);
211 } else if (ibuf[n - 1] != '\n') {
212 /* discard line */
213 errmsg = "unexpected end-of-file";
214 clearerr(stdin);
215 status = ERR;
216 continue;
217 }
218 isglobal = 0;
219 if ((status = extract_addr_range()) >= 0 &&
220 (status = exec_command()) >= 0)
221 if (!status ||
222 (status = display_lines(current_addr, current_addr,
223 status)) >= 0)
224 continue;
225 switch (status) {
226 case EOF:
227 quit(0);
228 case EMOD:
229 modified = 0;
230 fputs("?\n", stderr); /* give warning */
231 errmsg = "warning: file modified";
232 if (!isatty(0)) {
233 fprintf(stderr, garrulous ?
234 "script, line %d: %s\n" :
235 "", lineno, errmsg);
236 quit(2);
237 }
238 break;
239 case FATAL:
240 if (!isatty(0))
241 fprintf(stderr, garrulous ?
242 "script, line %d: %s\n" : "",
243 lineno, errmsg);
244 else
245 fprintf(stderr, garrulous ? "%s\n" : "",
246 errmsg);
247 quit(3);
248 default:
249 fputs("?\n", stderr);
250 if (!isatty(0)) {
251 fprintf(stderr, garrulous ?
252 "script, line %d: %s\n" : "",
253 lineno, errmsg);
254 quit(2);
255 }
256 break;
257 }
258 }
259 /*NOTREACHED*/
260}
261
262long first_addr, second_addr, addr_cnt;
263
264/* extract_addr_range: get line addresses from the command buffer until an
265 illegal address is seen; return status */
266int
267extract_addr_range(void)
268{
269 long addr;
270
271 addr_cnt = 0;
272 first_addr = second_addr = current_addr;
273 while ((addr = next_addr()) >= 0) {
274 addr_cnt++;
275 first_addr = second_addr;
276 second_addr = addr;
277 if (*ibufp != ',' && *ibufp != ';')
278 break;
279 else if (*ibufp++ == ';')
280 current_addr = addr;
281 }
282 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
283 first_addr = second_addr;
284 return (addr == ERR) ? ERR : 0;
285}
286
287
288#define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
289
290#define MUST_BE_FIRST() do { \
291 if (!first) { \
292 errmsg = "invalid address"; \
293 return ERR; \
294 } \
295} while (0);
296
297/* next_addr: return the next line address in the command buffer */
298long
299next_addr(void)
300{
301 const char *hd;
302 long addr = current_addr;
303 long n;
304 int first = 1;
305 int c;
306
307 SKIP_BLANKS();
308 for (hd = ibufp;; first = 0)
309 switch (c = *ibufp) {
310 case '+':
311 case '\t':
312 case ' ':
313 case '-':
314 case '^':
315 ibufp++;
316 SKIP_BLANKS();
317 if (isdigit((unsigned char)*ibufp)) {
318 STRTOL(n, ibufp);
319 addr += (c == '-' || c == '^') ? -n : n;
320 } else if (!isspace((unsigned char)c))
321 addr += (c == '-' || c == '^') ? -1 : 1;
322 break;
323 case '0': case '1': case '2':
324 case '3': case '4': case '5':
325 case '6': case '7': case '8': case '9':
326 MUST_BE_FIRST();
327 STRTOL(addr, ibufp);
328 break;
329 case '.':
330 case '$':
331 MUST_BE_FIRST();
332 ibufp++;
333 addr = (c == '.') ? current_addr : addr_last;
334 break;
335 case '/':
336 case '?':
337 MUST_BE_FIRST();
338 if ((addr = get_matching_node_addr(
339 get_compiled_pattern(), c == '/')) < 0)
340 return ERR;
341 else if (c == *ibufp)
342 ibufp++;
343 break;
344 case '\'':
345 MUST_BE_FIRST();
346 ibufp++;
347 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
348 return ERR;
349 break;
350 case '%':
351 case ',':
352 case ';':
353 if (first) {
354 ibufp++;
355 addr_cnt++;
356 second_addr = (c == ';') ? current_addr : 1;
357 addr = addr_last;
358 break;
359 }
360 /* FALLTHROUGH */
361 default:
362 if (ibufp == hd)
363 return EOF;
364 else if (addr < 0 || addr_last < addr) {
365 errmsg = "invalid address";
366 return ERR;
367 } else
368 return addr;
369 }
370 /* NOTREACHED */
371}
372
373
374#ifdef BACKWARDS
375/* GET_THIRD_ADDR: get a legal address from the command buffer */
376#define GET_THIRD_ADDR(addr) \
377{ \
378 long ol1, ol2; \
379\
380 ol1 = first_addr, ol2 = second_addr; \
381 if (extract_addr_range() < 0) \
382 return ERR; \
383 else if (addr_cnt == 0) { \
384 errmsg = "destination expected"; \
385 return ERR; \
386 } else if (second_addr < 0 || addr_last < second_addr) { \
387 errmsg = "invalid address"; \
388 return ERR; \
389 } \
390 addr = second_addr; \
391 first_addr = ol1, second_addr = ol2; \
392}
393#else /* BACKWARDS */
394/* GET_THIRD_ADDR: get a legal address from the command buffer */
395#define GET_THIRD_ADDR(addr) \
396{ \
397 long ol1, ol2; \
398\
399 ol1 = first_addr, ol2 = second_addr; \
400 if (extract_addr_range() < 0) \
401 return ERR; \
402 if (second_addr < 0 || addr_last < second_addr) { \
403 errmsg = "invalid address"; \
404 return ERR; \
405 } \
406 addr = second_addr; \
407 first_addr = ol1, second_addr = ol2; \
408}
409#endif
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
443int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
444
445long rows = 22; /* scroll length: ws_row - 2 */
446
447/* exec_command: execute the next command in command buffer; return print
448 request, if any */
449int
450exec_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 (check_addr_range(current_addr, current_addr) < 0)
474 return ERR;
475 GET_COMMAND_SUFFIX();
476 if (!isglobal) clear_undo_stack();
477 if (delete_lines(first_addr, second_addr) < 0 ||
478 append_lines(current_addr) < 0)
479 return ERR;
480 break;
481 case 'd':
482 if (check_addr_range(current_addr, current_addr) < 0)
483 return ERR;
484 GET_COMMAND_SUFFIX();
485 if (!isglobal) clear_undo_stack();
486 if (delete_lines(first_addr, second_addr) < 0)
487 return ERR;
488 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
489 current_addr = addr;
490 break;
491 case 'e':
492 if (modified && !scripted)
493 return EMOD;
494 /* FALLTHROUGH */
495 case 'E':
496 if (addr_cnt > 0) {
497 errmsg = "unexpected address";
498 return ERR;
499 } else if (!isspace((unsigned char)*ibufp)) {
500 errmsg = "unexpected command suffix";
501 return ERR;
502 } else if ((fnp = get_filename()) == NULL)
503 return ERR;
504 GET_COMMAND_SUFFIX();
505 if (delete_lines(1, addr_last) < 0)
506 return ERR;
507 clear_undo_stack();
508 if (close_sbuf() < 0)
509 return ERR;
510 else if (open_sbuf() < 0)
511 return FATAL;
512 if (*fnp && *fnp != '!') strcpy(old_filename, fnp);
513#ifdef BACKWARDS
514 if (*fnp == '\0' && *old_filename == '\0') {
515 errmsg = "no current filename";
516 return ERR;
517 }
518#endif
519 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
520 return ERR;
521 clear_undo_stack();
522 modified = 0;
523 u_current_addr = u_addr_last = -1;
524 break;
525 case 'f':
526 if (addr_cnt > 0) {
527 errmsg = "unexpected address";
528 return ERR;
529 } else if (!isspace((unsigned char)*ibufp)) {
530 errmsg = "unexpected command suffix";
531 return ERR;
532 } else if ((fnp = get_filename()) == NULL)
533 return ERR;
534 else if (*fnp == '!') {
535 errmsg = "invalid redirection";
536 return ERR;
537 }
538 GET_COMMAND_SUFFIX();
539 if (*fnp) strcpy(old_filename, fnp);
540 printf("%s\n", strip_escapes(old_filename));
541 break;
542 case 'g':
543 case 'v':
544 case 'G':
545 case 'V':
546 if (isglobal) {
547 errmsg = "cannot nest global commands";
548 return ERR;
549 } else if (check_addr_range(1, addr_last) < 0)
550 return ERR;
551 else if (build_active_list(c == 'g' || c == 'G') < 0)
552 return ERR;
553 else if ((n = (c == 'G' || c == 'V')))
554 GET_COMMAND_SUFFIX();
555 isglobal++;
556 if (exec_global(n, gflag) < 0)
557 return ERR;
558 break;
559 case 'h':
560 if (addr_cnt > 0) {
561 errmsg = "unexpected address";
562 return ERR;
563 }
564 GET_COMMAND_SUFFIX();
565 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
566 break;
567 case 'H':
568 if (addr_cnt > 0) {
569 errmsg = "unexpected address";
570 return ERR;
571 }
572 GET_COMMAND_SUFFIX();
573 if ((garrulous = 1 - garrulous) && *errmsg)
574 fprintf(stderr, "%s\n", errmsg);
575 break;
576 case 'i':
577 if (second_addr == 0) {
578 errmsg = "invalid address";
579 return ERR;
580 }
581 GET_COMMAND_SUFFIX();
582 if (!isglobal) clear_undo_stack();
583 if (append_lines(second_addr - 1) < 0)
584 return ERR;
585 break;
586 case 'j':
587 if (check_addr_range(current_addr, current_addr + 1) < 0)
588 return ERR;
589 GET_COMMAND_SUFFIX();
590 if (!isglobal) clear_undo_stack();
591 if (first_addr != second_addr &&
592 join_lines(first_addr, second_addr) < 0)
593 return ERR;
594 break;
595 case 'k':
596 c = *ibufp++;
597 if (second_addr == 0) {
598 errmsg = "invalid address";
599 return ERR;
600 }
601 GET_COMMAND_SUFFIX();
602 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
603 return ERR;
604 break;
605 case 'l':
606 if (check_addr_range(current_addr, current_addr) < 0)
607 return ERR;
608 GET_COMMAND_SUFFIX();
609 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
610 return ERR;
611 gflag = 0;
612 break;
613 case 'm':
614 if (check_addr_range(current_addr, current_addr) < 0)
615 return ERR;
616 GET_THIRD_ADDR(addr);
617 if (first_addr <= addr && addr < second_addr) {
618 errmsg = "invalid destination";
619 return ERR;
620 }
621 GET_COMMAND_SUFFIX();
622 if (!isglobal) clear_undo_stack();
623 if (move_lines(addr) < 0)
624 return ERR;
625 break;
626 case 'n':
627 if (check_addr_range(current_addr, current_addr) < 0)
628 return ERR;
629 GET_COMMAND_SUFFIX();
630 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
631 return ERR;
632 gflag = 0;
633 break;
634 case 'p':
635 if (check_addr_range(current_addr, current_addr) < 0)
636 return ERR;
637 GET_COMMAND_SUFFIX();
638 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
639 return ERR;
640 gflag = 0;
641 break;
642 case 'P':
643 if (addr_cnt > 0) {
644 errmsg = "unexpected address";
645 return ERR;
646 }
647 GET_COMMAND_SUFFIX();
648 prompt = prompt ? NULL : optarg ? optarg : dps;
649 break;
650 case 'q':
651 case 'Q':
652 if (addr_cnt > 0) {
653 errmsg = "unexpected address";
654 return ERR;
655 }
656 GET_COMMAND_SUFFIX();
657 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
658 break;
659 case 'r':
660 if (!isspace((unsigned char)*ibufp)) {
661 errmsg = "unexpected command suffix";
662 return ERR;
663 } else if (addr_cnt == 0)
664 second_addr = addr_last;
665 if ((fnp = get_filename()) == NULL)
666 return ERR;
667 GET_COMMAND_SUFFIX();
668 if (!isglobal) clear_undo_stack();
669 if (*old_filename == '\0' && *fnp != '!')
670 strcpy(old_filename, fnp);
671#ifdef BACKWARDS
672 if (*fnp == '\0' && *old_filename == '\0') {
673 errmsg = "no current filename";
674 return ERR;
675 }
676#endif
677 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
678 return ERR;
679 else if (addr && addr != addr_last)
680 modified = 1;
681 break;
682 case 's':
683 do {
684 switch(*ibufp) {
685 case '\n':
686 sflags |=SGF;
687 break;
688 case 'g':
689 sflags |= SGG;
690 ibufp++;
691 break;
692 case 'p':
693 sflags |= SGP;
694 ibufp++;
695 break;
696 case 'r':
697 sflags |= SGR;
698 ibufp++;
699 break;
700 case '0': case '1': case '2': case '3': case '4':
701 case '5': case '6': case '7': case '8': case '9':
702 STRTOL(sgnum, ibufp);
703 sflags |= SGF;
704 sgflag &= ~GSG; /* override GSG */
705 break;
706 default:
707 if (sflags) {
708 errmsg = "invalid command suffix";
709 return ERR;
710 }
711 }
712 } while (sflags && *ibufp != '\n');
713 if (sflags && !pat) {
714 errmsg = "no previous substitution";
715 return ERR;
716 } else if (sflags & SGG)
717 sgnum = 0; /* override numeric arg */
718 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
719 errmsg = "invalid pattern delimiter";
720 return ERR;
721 }
722 tpat = pat;
723 SPL1();
724 if ((!sflags || (sflags & SGR)) &&
725 (tpat = get_compiled_pattern()) == NULL) {
726 SPL0();
727 return ERR;
728 } else if (tpat != pat) {
729 if (pat) {
730 regfree(pat);
731 free(pat);
732 }
733 pat = tpat;
734 patlock = 1; /* reserve pattern */
735 }
736 SPL0();
737 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
738 return ERR;
739 else if (isglobal)
740 sgflag |= GLB;
741 else
742 sgflag &= ~GLB;
743 if (sflags & SGG)
744 sgflag ^= GSG;
745 if (sflags & SGP)
746 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
747 do {
748 switch(*ibufp) {
749 case 'p':
750 sgflag |= GPR, ibufp++;
751 break;
752 case 'l':
753 sgflag |= GLS, ibufp++;
754 break;
755 case 'n':
756 sgflag |= GNP, ibufp++;
757 break;
758 default:
759 n++;
760 }
761 } while (!n);
762 if (check_addr_range(current_addr, current_addr) < 0)
763 return ERR;
764 GET_COMMAND_SUFFIX();
765 if (!isglobal) clear_undo_stack();
766 if (search_and_replace(pat, sgflag, sgnum) < 0)
767 return ERR;
768 break;
769 case 't':
770 if (check_addr_range(current_addr, current_addr) < 0)
771 return ERR;
772 GET_THIRD_ADDR(addr);
773 GET_COMMAND_SUFFIX();
774 if (!isglobal) clear_undo_stack();
775 if (copy_lines(addr) < 0)
776 return ERR;
777 break;
778 case 'u':
779 if (addr_cnt > 0) {
780 errmsg = "unexpected address";
781 return ERR;
782 }
783 GET_COMMAND_SUFFIX();
784 if (pop_undo_stack() < 0)
785 return ERR;
786 break;
787 case 'w':
788 case 'W':
789 if ((n = *ibufp) == 'q' || n == 'Q') {
790 gflag = EOF;
791 ibufp++;
792 }
793 if (!isspace((unsigned char)*ibufp)) {
794 errmsg = "unexpected command suffix";
795 return ERR;
796 } else if ((fnp = get_filename()) == NULL)
797 return ERR;
798 if (addr_cnt == 0 && !addr_last)
799 first_addr = second_addr = 0;
800 else if (check_addr_range(1, addr_last) < 0)
801 return ERR;
802 GET_COMMAND_SUFFIX();
803 if (*old_filename == '\0' && *fnp != '!')
804 strcpy(old_filename, fnp);
805#ifdef BACKWARDS
806 if (*fnp == '\0' && *old_filename == '\0') {
807 errmsg = "no current filename";
808 return ERR;
809 }
810#endif
811 if ((addr = write_file(*fnp ? fnp : old_filename,
812 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
813 return ERR;
814 else if (addr == addr_last)
815 modified = 0;
816 else if (modified && !scripted && n == 'q')
817 gflag = EMOD;
818 break;
819 case 'x':
820 if (addr_cnt > 0) {
821 errmsg = "unexpected address";
822 return ERR;
823 }
824 GET_COMMAND_SUFFIX();
825#ifdef DES
826 des = get_keyword();
| 39
40/*
41 * CREDITS
42 *
43 * This program is based on the editor algorithm described in
44 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
45 * in Pascal," Addison-Wesley, 1981.
46 *
47 * The buffering algorithm is attributed to Rodney Ruddock of
48 * the University of Guelph, Guelph, Ontario.
49 *
50 * The cbc.c encryption code is adapted from
51 * the bdes program by Matt Bishop of Dartmouth College,
52 * Hanover, NH.
53 *
54 */
55
56#include <sys/types.h>
57
58#include <sys/ioctl.h>
59#include <sys/wait.h>
60#include <ctype.h>
61#include <locale.h>
62#include <pwd.h>
63#include <setjmp.h>
64
65#include "ed.h"
66
67
68#ifdef _POSIX_SOURCE
69sigjmp_buf env;
70#else
71jmp_buf env;
72#endif
73
74/* static buffers */
75char stdinbuf[1]; /* stdin buffer */
76char *shcmd; /* shell command buffer */
77int shcmdsz; /* shell command buffer size */
78int shcmdi; /* shell command buffer index */
79char *ibuf; /* ed command-line buffer */
80int ibufsz; /* ed command-line buffer size */
81char *ibufp; /* pointer to ed command-line buffer */
82
83/* global flags */
84int des = 0; /* if set, use crypt(3) for i/o */
85int garrulous = 0; /* if set, print all error messages */
86int isbinary; /* if set, buffer contains ASCII NULs */
87int isglobal; /* if set, doing a global command */
88int modified; /* if set, buffer modified since last write */
89int mutex = 0; /* if set, signals set "sigflags" */
90int red = 0; /* if set, restrict shell/directory access */
91int scripted = 0; /* if set, suppress diagnostics */
92int sigflags = 0; /* if set, signals received while mutex set */
93int sigactive = 0; /* if set, signal handlers are enabled */
94
95char old_filename[PATH_MAX] = ""; /* default filename */
96long current_addr; /* current address in editor buffer */
97long addr_last; /* last address in editor buffer */
98int lineno; /* script line number */
99const char *prompt; /* command-line prompt */
100const char *dps = "*"; /* default command-line prompt */
101
102const char usage[] = "usage: %s [-] [-sx] [-p string] [name]\n";
103
104/* ed: line editor */
105int
106main(int argc, char *argv[])
107{
108 int c, n;
109 long status = 0;
110#if __GNUC__
111 /* Avoid longjmp clobbering */
112 (void) &argc;
113 (void) &argv;
114#endif
115
116 (void)setlocale(LC_ALL, "");
117
118 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
119top:
120 while ((c = getopt(argc, argv, "p:sx")) != -1)
121 switch(c) {
122 case 'p': /* set prompt */
123 prompt = optarg;
124 break;
125 case 's': /* run script */
126 scripted = 1;
127 break;
128 case 'x': /* use crypt */
129#ifdef DES
130 des = get_keyword();
131#else
132 fprintf(stderr, "crypt unavailable\n?\n");
133#endif
134 break;
135
136 default:
137 fprintf(stderr, usage, argv[0]);
138 exit(1);
139 }
140 argv += optind;
141 argc -= optind;
142 if (argc && **argv == '-') {
143 scripted = 1;
144 if (argc > 1) {
145 optind = 1;
146 goto top;
147 }
148 argv++;
149 argc--;
150 }
151 /* assert: reliable signals! */
152#ifdef SIGWINCH
153 handle_winch(SIGWINCH);
154 if (isatty(0)) signal(SIGWINCH, handle_winch);
155#endif
156 signal(SIGHUP, signal_hup);
157 signal(SIGQUIT, SIG_IGN);
158 signal(SIGINT, signal_int);
159#ifdef _POSIX_SOURCE
160 if ((status = sigsetjmp(env, 1)))
161#else
162 if ((status = setjmp(env)))
163#endif
164 {
165 fputs("\n?\n", stderr);
166 errmsg = "interrupt";
167 } else {
168 init_buffers();
169 sigactive = 1; /* enable signal handlers */
170 if (argc && **argv && is_legal_filename(*argv)) {
171 if (read_file(*argv, 0) < 0 && !isatty(0))
172 quit(2);
173 else if (**argv != '!')
174 if (strlcpy(old_filename, *argv, sizeof(old_filename))
175 >= sizeof(old_filename))
176 quit(2);
177 } else if (argc) {
178 fputs("?\n", stderr);
179 if (**argv == '\0')
180 errmsg = "invalid filename";
181 if (!isatty(0))
182 quit(2);
183 }
184 }
185 for (;;) {
186 if (status < 0 && garrulous)
187 fprintf(stderr, "%s\n", errmsg);
188 if (prompt) {
189 printf("%s", prompt);
190 fflush(stdout);
191 }
192 if ((n = get_tty_line()) < 0) {
193 status = ERR;
194 continue;
195 } else if (n == 0) {
196 if (modified && !scripted) {
197 fputs("?\n", stderr);
198 errmsg = "warning: file modified";
199 if (!isatty(0)) {
200 fprintf(stderr, garrulous ?
201 "script, line %d: %s\n" :
202 "", lineno, errmsg);
203 quit(2);
204 }
205 clearerr(stdin);
206 modified = 0;
207 status = EMOD;
208 continue;
209 } else
210 quit(0);
211 } else if (ibuf[n - 1] != '\n') {
212 /* discard line */
213 errmsg = "unexpected end-of-file";
214 clearerr(stdin);
215 status = ERR;
216 continue;
217 }
218 isglobal = 0;
219 if ((status = extract_addr_range()) >= 0 &&
220 (status = exec_command()) >= 0)
221 if (!status ||
222 (status = display_lines(current_addr, current_addr,
223 status)) >= 0)
224 continue;
225 switch (status) {
226 case EOF:
227 quit(0);
228 case EMOD:
229 modified = 0;
230 fputs("?\n", stderr); /* give warning */
231 errmsg = "warning: file modified";
232 if (!isatty(0)) {
233 fprintf(stderr, garrulous ?
234 "script, line %d: %s\n" :
235 "", lineno, errmsg);
236 quit(2);
237 }
238 break;
239 case FATAL:
240 if (!isatty(0))
241 fprintf(stderr, garrulous ?
242 "script, line %d: %s\n" : "",
243 lineno, errmsg);
244 else
245 fprintf(stderr, garrulous ? "%s\n" : "",
246 errmsg);
247 quit(3);
248 default:
249 fputs("?\n", stderr);
250 if (!isatty(0)) {
251 fprintf(stderr, garrulous ?
252 "script, line %d: %s\n" : "",
253 lineno, errmsg);
254 quit(2);
255 }
256 break;
257 }
258 }
259 /*NOTREACHED*/
260}
261
262long first_addr, second_addr, addr_cnt;
263
264/* extract_addr_range: get line addresses from the command buffer until an
265 illegal address is seen; return status */
266int
267extract_addr_range(void)
268{
269 long addr;
270
271 addr_cnt = 0;
272 first_addr = second_addr = current_addr;
273 while ((addr = next_addr()) >= 0) {
274 addr_cnt++;
275 first_addr = second_addr;
276 second_addr = addr;
277 if (*ibufp != ',' && *ibufp != ';')
278 break;
279 else if (*ibufp++ == ';')
280 current_addr = addr;
281 }
282 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
283 first_addr = second_addr;
284 return (addr == ERR) ? ERR : 0;
285}
286
287
288#define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
289
290#define MUST_BE_FIRST() do { \
291 if (!first) { \
292 errmsg = "invalid address"; \
293 return ERR; \
294 } \
295} while (0);
296
297/* next_addr: return the next line address in the command buffer */
298long
299next_addr(void)
300{
301 const char *hd;
302 long addr = current_addr;
303 long n;
304 int first = 1;
305 int c;
306
307 SKIP_BLANKS();
308 for (hd = ibufp;; first = 0)
309 switch (c = *ibufp) {
310 case '+':
311 case '\t':
312 case ' ':
313 case '-':
314 case '^':
315 ibufp++;
316 SKIP_BLANKS();
317 if (isdigit((unsigned char)*ibufp)) {
318 STRTOL(n, ibufp);
319 addr += (c == '-' || c == '^') ? -n : n;
320 } else if (!isspace((unsigned char)c))
321 addr += (c == '-' || c == '^') ? -1 : 1;
322 break;
323 case '0': case '1': case '2':
324 case '3': case '4': case '5':
325 case '6': case '7': case '8': case '9':
326 MUST_BE_FIRST();
327 STRTOL(addr, ibufp);
328 break;
329 case '.':
330 case '$':
331 MUST_BE_FIRST();
332 ibufp++;
333 addr = (c == '.') ? current_addr : addr_last;
334 break;
335 case '/':
336 case '?':
337 MUST_BE_FIRST();
338 if ((addr = get_matching_node_addr(
339 get_compiled_pattern(), c == '/')) < 0)
340 return ERR;
341 else if (c == *ibufp)
342 ibufp++;
343 break;
344 case '\'':
345 MUST_BE_FIRST();
346 ibufp++;
347 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
348 return ERR;
349 break;
350 case '%':
351 case ',':
352 case ';':
353 if (first) {
354 ibufp++;
355 addr_cnt++;
356 second_addr = (c == ';') ? current_addr : 1;
357 addr = addr_last;
358 break;
359 }
360 /* FALLTHROUGH */
361 default:
362 if (ibufp == hd)
363 return EOF;
364 else if (addr < 0 || addr_last < addr) {
365 errmsg = "invalid address";
366 return ERR;
367 } else
368 return addr;
369 }
370 /* NOTREACHED */
371}
372
373
374#ifdef BACKWARDS
375/* GET_THIRD_ADDR: get a legal address from the command buffer */
376#define GET_THIRD_ADDR(addr) \
377{ \
378 long ol1, ol2; \
379\
380 ol1 = first_addr, ol2 = second_addr; \
381 if (extract_addr_range() < 0) \
382 return ERR; \
383 else if (addr_cnt == 0) { \
384 errmsg = "destination expected"; \
385 return ERR; \
386 } else if (second_addr < 0 || addr_last < second_addr) { \
387 errmsg = "invalid address"; \
388 return ERR; \
389 } \
390 addr = second_addr; \
391 first_addr = ol1, second_addr = ol2; \
392}
393#else /* BACKWARDS */
394/* GET_THIRD_ADDR: get a legal address from the command buffer */
395#define GET_THIRD_ADDR(addr) \
396{ \
397 long ol1, ol2; \
398\
399 ol1 = first_addr, ol2 = second_addr; \
400 if (extract_addr_range() < 0) \
401 return ERR; \
402 if (second_addr < 0 || addr_last < second_addr) { \
403 errmsg = "invalid address"; \
404 return ERR; \
405 } \
406 addr = second_addr; \
407 first_addr = ol1, second_addr = ol2; \
408}
409#endif
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
443int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
444
445long rows = 22; /* scroll length: ws_row - 2 */
446
447/* exec_command: execute the next command in command buffer; return print
448 request, if any */
449int
450exec_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 (check_addr_range(current_addr, current_addr) < 0)
474 return ERR;
475 GET_COMMAND_SUFFIX();
476 if (!isglobal) clear_undo_stack();
477 if (delete_lines(first_addr, second_addr) < 0 ||
478 append_lines(current_addr) < 0)
479 return ERR;
480 break;
481 case 'd':
482 if (check_addr_range(current_addr, current_addr) < 0)
483 return ERR;
484 GET_COMMAND_SUFFIX();
485 if (!isglobal) clear_undo_stack();
486 if (delete_lines(first_addr, second_addr) < 0)
487 return ERR;
488 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
489 current_addr = addr;
490 break;
491 case 'e':
492 if (modified && !scripted)
493 return EMOD;
494 /* FALLTHROUGH */
495 case 'E':
496 if (addr_cnt > 0) {
497 errmsg = "unexpected address";
498 return ERR;
499 } else if (!isspace((unsigned char)*ibufp)) {
500 errmsg = "unexpected command suffix";
501 return ERR;
502 } else if ((fnp = get_filename()) == NULL)
503 return ERR;
504 GET_COMMAND_SUFFIX();
505 if (delete_lines(1, addr_last) < 0)
506 return ERR;
507 clear_undo_stack();
508 if (close_sbuf() < 0)
509 return ERR;
510 else if (open_sbuf() < 0)
511 return FATAL;
512 if (*fnp && *fnp != '!') strcpy(old_filename, fnp);
513#ifdef BACKWARDS
514 if (*fnp == '\0' && *old_filename == '\0') {
515 errmsg = "no current filename";
516 return ERR;
517 }
518#endif
519 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
520 return ERR;
521 clear_undo_stack();
522 modified = 0;
523 u_current_addr = u_addr_last = -1;
524 break;
525 case 'f':
526 if (addr_cnt > 0) {
527 errmsg = "unexpected address";
528 return ERR;
529 } else if (!isspace((unsigned char)*ibufp)) {
530 errmsg = "unexpected command suffix";
531 return ERR;
532 } else if ((fnp = get_filename()) == NULL)
533 return ERR;
534 else if (*fnp == '!') {
535 errmsg = "invalid redirection";
536 return ERR;
537 }
538 GET_COMMAND_SUFFIX();
539 if (*fnp) strcpy(old_filename, fnp);
540 printf("%s\n", strip_escapes(old_filename));
541 break;
542 case 'g':
543 case 'v':
544 case 'G':
545 case 'V':
546 if (isglobal) {
547 errmsg = "cannot nest global commands";
548 return ERR;
549 } else if (check_addr_range(1, addr_last) < 0)
550 return ERR;
551 else if (build_active_list(c == 'g' || c == 'G') < 0)
552 return ERR;
553 else if ((n = (c == 'G' || c == 'V')))
554 GET_COMMAND_SUFFIX();
555 isglobal++;
556 if (exec_global(n, gflag) < 0)
557 return ERR;
558 break;
559 case 'h':
560 if (addr_cnt > 0) {
561 errmsg = "unexpected address";
562 return ERR;
563 }
564 GET_COMMAND_SUFFIX();
565 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
566 break;
567 case 'H':
568 if (addr_cnt > 0) {
569 errmsg = "unexpected address";
570 return ERR;
571 }
572 GET_COMMAND_SUFFIX();
573 if ((garrulous = 1 - garrulous) && *errmsg)
574 fprintf(stderr, "%s\n", errmsg);
575 break;
576 case 'i':
577 if (second_addr == 0) {
578 errmsg = "invalid address";
579 return ERR;
580 }
581 GET_COMMAND_SUFFIX();
582 if (!isglobal) clear_undo_stack();
583 if (append_lines(second_addr - 1) < 0)
584 return ERR;
585 break;
586 case 'j':
587 if (check_addr_range(current_addr, current_addr + 1) < 0)
588 return ERR;
589 GET_COMMAND_SUFFIX();
590 if (!isglobal) clear_undo_stack();
591 if (first_addr != second_addr &&
592 join_lines(first_addr, second_addr) < 0)
593 return ERR;
594 break;
595 case 'k':
596 c = *ibufp++;
597 if (second_addr == 0) {
598 errmsg = "invalid address";
599 return ERR;
600 }
601 GET_COMMAND_SUFFIX();
602 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
603 return ERR;
604 break;
605 case 'l':
606 if (check_addr_range(current_addr, current_addr) < 0)
607 return ERR;
608 GET_COMMAND_SUFFIX();
609 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
610 return ERR;
611 gflag = 0;
612 break;
613 case 'm':
614 if (check_addr_range(current_addr, current_addr) < 0)
615 return ERR;
616 GET_THIRD_ADDR(addr);
617 if (first_addr <= addr && addr < second_addr) {
618 errmsg = "invalid destination";
619 return ERR;
620 }
621 GET_COMMAND_SUFFIX();
622 if (!isglobal) clear_undo_stack();
623 if (move_lines(addr) < 0)
624 return ERR;
625 break;
626 case 'n':
627 if (check_addr_range(current_addr, current_addr) < 0)
628 return ERR;
629 GET_COMMAND_SUFFIX();
630 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
631 return ERR;
632 gflag = 0;
633 break;
634 case 'p':
635 if (check_addr_range(current_addr, current_addr) < 0)
636 return ERR;
637 GET_COMMAND_SUFFIX();
638 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
639 return ERR;
640 gflag = 0;
641 break;
642 case 'P':
643 if (addr_cnt > 0) {
644 errmsg = "unexpected address";
645 return ERR;
646 }
647 GET_COMMAND_SUFFIX();
648 prompt = prompt ? NULL : optarg ? optarg : dps;
649 break;
650 case 'q':
651 case 'Q':
652 if (addr_cnt > 0) {
653 errmsg = "unexpected address";
654 return ERR;
655 }
656 GET_COMMAND_SUFFIX();
657 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
658 break;
659 case 'r':
660 if (!isspace((unsigned char)*ibufp)) {
661 errmsg = "unexpected command suffix";
662 return ERR;
663 } else if (addr_cnt == 0)
664 second_addr = addr_last;
665 if ((fnp = get_filename()) == NULL)
666 return ERR;
667 GET_COMMAND_SUFFIX();
668 if (!isglobal) clear_undo_stack();
669 if (*old_filename == '\0' && *fnp != '!')
670 strcpy(old_filename, fnp);
671#ifdef BACKWARDS
672 if (*fnp == '\0' && *old_filename == '\0') {
673 errmsg = "no current filename";
674 return ERR;
675 }
676#endif
677 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
678 return ERR;
679 else if (addr && addr != addr_last)
680 modified = 1;
681 break;
682 case 's':
683 do {
684 switch(*ibufp) {
685 case '\n':
686 sflags |=SGF;
687 break;
688 case 'g':
689 sflags |= SGG;
690 ibufp++;
691 break;
692 case 'p':
693 sflags |= SGP;
694 ibufp++;
695 break;
696 case 'r':
697 sflags |= SGR;
698 ibufp++;
699 break;
700 case '0': case '1': case '2': case '3': case '4':
701 case '5': case '6': case '7': case '8': case '9':
702 STRTOL(sgnum, ibufp);
703 sflags |= SGF;
704 sgflag &= ~GSG; /* override GSG */
705 break;
706 default:
707 if (sflags) {
708 errmsg = "invalid command suffix";
709 return ERR;
710 }
711 }
712 } while (sflags && *ibufp != '\n');
713 if (sflags && !pat) {
714 errmsg = "no previous substitution";
715 return ERR;
716 } else if (sflags & SGG)
717 sgnum = 0; /* override numeric arg */
718 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
719 errmsg = "invalid pattern delimiter";
720 return ERR;
721 }
722 tpat = pat;
723 SPL1();
724 if ((!sflags || (sflags & SGR)) &&
725 (tpat = get_compiled_pattern()) == NULL) {
726 SPL0();
727 return ERR;
728 } else if (tpat != pat) {
729 if (pat) {
730 regfree(pat);
731 free(pat);
732 }
733 pat = tpat;
734 patlock = 1; /* reserve pattern */
735 }
736 SPL0();
737 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
738 return ERR;
739 else if (isglobal)
740 sgflag |= GLB;
741 else
742 sgflag &= ~GLB;
743 if (sflags & SGG)
744 sgflag ^= GSG;
745 if (sflags & SGP)
746 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
747 do {
748 switch(*ibufp) {
749 case 'p':
750 sgflag |= GPR, ibufp++;
751 break;
752 case 'l':
753 sgflag |= GLS, ibufp++;
754 break;
755 case 'n':
756 sgflag |= GNP, ibufp++;
757 break;
758 default:
759 n++;
760 }
761 } while (!n);
762 if (check_addr_range(current_addr, current_addr) < 0)
763 return ERR;
764 GET_COMMAND_SUFFIX();
765 if (!isglobal) clear_undo_stack();
766 if (search_and_replace(pat, sgflag, sgnum) < 0)
767 return ERR;
768 break;
769 case 't':
770 if (check_addr_range(current_addr, current_addr) < 0)
771 return ERR;
772 GET_THIRD_ADDR(addr);
773 GET_COMMAND_SUFFIX();
774 if (!isglobal) clear_undo_stack();
775 if (copy_lines(addr) < 0)
776 return ERR;
777 break;
778 case 'u':
779 if (addr_cnt > 0) {
780 errmsg = "unexpected address";
781 return ERR;
782 }
783 GET_COMMAND_SUFFIX();
784 if (pop_undo_stack() < 0)
785 return ERR;
786 break;
787 case 'w':
788 case 'W':
789 if ((n = *ibufp) == 'q' || n == 'Q') {
790 gflag = EOF;
791 ibufp++;
792 }
793 if (!isspace((unsigned char)*ibufp)) {
794 errmsg = "unexpected command suffix";
795 return ERR;
796 } else if ((fnp = get_filename()) == NULL)
797 return ERR;
798 if (addr_cnt == 0 && !addr_last)
799 first_addr = second_addr = 0;
800 else if (check_addr_range(1, addr_last) < 0)
801 return ERR;
802 GET_COMMAND_SUFFIX();
803 if (*old_filename == '\0' && *fnp != '!')
804 strcpy(old_filename, fnp);
805#ifdef BACKWARDS
806 if (*fnp == '\0' && *old_filename == '\0') {
807 errmsg = "no current filename";
808 return ERR;
809 }
810#endif
811 if ((addr = write_file(*fnp ? fnp : old_filename,
812 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
813 return ERR;
814 else if (addr == addr_last)
815 modified = 0;
816 else if (modified && !scripted && n == 'q')
817 gflag = EMOD;
818 break;
819 case 'x':
820 if (addr_cnt > 0) {
821 errmsg = "unexpected address";
822 return ERR;
823 }
824 GET_COMMAND_SUFFIX();
825#ifdef DES
826 des = get_keyword();
|
| 827 break;
|
827#else
828 errmsg = "crypt unavailable";
829 return ERR;
830#endif
| 828#else
829 errmsg = "crypt unavailable";
830 return ERR;
831#endif
|
831 break;
| |
832 case 'z':
833#ifdef BACKWARDS
834 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
835#else
836 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
837#endif
838 return ERR;
839 else if ('0' < *ibufp && *ibufp <= '9')
840 STRTOL(rows, ibufp);
841 GET_COMMAND_SUFFIX();
842 if (display_lines(second_addr, min(addr_last,
843 second_addr + rows), gflag) < 0)
844 return ERR;
845 gflag = 0;
846 break;
847 case '=':
848 GET_COMMAND_SUFFIX();
849 printf("%ld\n", addr_cnt ? second_addr : addr_last);
850 break;
851 case '!':
852 if (addr_cnt > 0) {
853 errmsg = "unexpected address";
854 return ERR;
855 } else if ((sflags = get_shell_command()) < 0)
856 return ERR;
857 GET_COMMAND_SUFFIX();
858 if (sflags) printf("%s\n", shcmd + 1);
859 system(shcmd + 1);
860 if (!scripted) printf("!\n");
861 break;
862 case '\n':
863#ifdef BACKWARDS
864 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
865#else
866 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
867#endif
868 || display_lines(second_addr, second_addr, 0) < 0)
869 return ERR;
870 break;
871 default:
872 errmsg = "unknown command";
873 return ERR;
874 }
875 return gflag;
876}
877
878
879/* check_addr_range: return status of address range check */
880int
881check_addr_range(long n, long m)
882{
883 if (addr_cnt == 0) {
884 first_addr = n;
885 second_addr = m;
886 }
887 if (first_addr > second_addr || 1 > first_addr ||
888 second_addr > addr_last) {
889 errmsg = "invalid address";
890 return ERR;
891 }
892 return 0;
893}
894
895
896/* get_matching_node_addr: return the address of the next line matching a
897 pattern in a given direction. wrap around begin/end of editor buffer if
898 necessary */
899long
900get_matching_node_addr(pattern_t *pat, int dir)
901{
902 char *s;
903 long n = current_addr;
904 line_t *lp;
905
906 if (!pat) return ERR;
907 do {
908 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
909 lp = get_addressed_line_node(n);
910 if ((s = get_sbuf_line(lp)) == NULL)
911 return ERR;
912 if (isbinary)
913 NUL_TO_NEWLINE(s, lp->len);
914 if (!regexec(pat, s, 0, NULL, 0))
915 return n;
916 }
917 } while (n != current_addr);
918 errmsg = "no match";
919 return ERR;
920}
921
922
923/* get_filename: return pointer to copy of filename in the command buffer */
924char *
925get_filename(void)
926{
927 static char *file = NULL;
928 static int filesz = 0;
929
930 int n;
931
932 if (*ibufp != '\n') {
933 SKIP_BLANKS();
934 if (*ibufp == '\n') {
935 errmsg = "invalid filename";
936 return NULL;
937 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
938 return NULL;
939 else if (*ibufp == '!') {
940 ibufp++;
941 if ((n = get_shell_command()) < 0)
942 return NULL;
943 if (n)
944 printf("%s\n", shcmd + 1);
945 return shcmd;
946 } else if (n > PATH_MAX - 1) {
947 errmsg = "filename too long";
948 return NULL;
949 }
950 }
951#ifndef BACKWARDS
952 else if (*old_filename == '\0') {
953 errmsg = "no current filename";
954 return NULL;
955 }
956#endif
957 REALLOC(file, filesz, PATH_MAX, NULL);
958 for (n = 0; *ibufp != '\n';)
959 file[n++] = *ibufp++;
960 file[n] = '\0';
961 return is_legal_filename(file) ? file : NULL;
962}
963
964
965/* get_shell_command: read a shell command from stdin; return substitution
966 status */
967int
968get_shell_command(void)
969{
970 static char *buf = NULL;
971 static int n = 0;
972
973 char *s; /* substitution char pointer */
974 int i = 0;
975 int j = 0;
976
977 if (red) {
978 errmsg = "shell access restricted";
979 return ERR;
980 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
981 return ERR;
982 REALLOC(buf, n, j + 1, ERR);
983 buf[i++] = '!'; /* prefix command w/ bang */
984 while (*ibufp != '\n')
985 switch (*ibufp) {
986 default:
987 REALLOC(buf, n, i + 2, ERR);
988 buf[i++] = *ibufp;
989 if (*ibufp++ == '\\')
990 buf[i++] = *ibufp++;
991 break;
992 case '!':
993 if (s != ibufp) {
994 REALLOC(buf, n, i + 1, ERR);
995 buf[i++] = *ibufp++;
996 }
997#ifdef BACKWARDS
998 else if (shcmd == NULL || *(shcmd + 1) == '\0')
999#else
1000 else if (shcmd == NULL)
1001#endif
1002 {
1003 errmsg = "no previous command";
1004 return ERR;
1005 } else {
1006 REALLOC(buf, n, i + shcmdi, ERR);
1007 for (s = shcmd + 1; s < shcmd + shcmdi;)
1008 buf[i++] = *s++;
1009 s = ibufp++;
1010 }
1011 break;
1012 case '%':
1013 if (*old_filename == '\0') {
1014 errmsg = "no current filename";
1015 return ERR;
1016 }
1017 j = strlen(s = strip_escapes(old_filename));
1018 REALLOC(buf, n, i + j, ERR);
1019 while (j--)
1020 buf[i++] = *s++;
1021 s = ibufp++;
1022 break;
1023 }
1024 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1025 memcpy(shcmd, buf, i);
1026 shcmd[shcmdi = i] = '\0';
1027 return *s == '!' || *s == '%';
1028}
1029
1030
1031/* append_lines: insert text from stdin to after line n; stop when either a
1032 single period is read or EOF; return status */
1033int
1034append_lines(long n)
1035{
1036 int l;
1037 const char *lp = ibuf;
1038 const char *eot;
1039 undo_t *up = NULL;
1040
1041 for (current_addr = n;;) {
1042 if (!isglobal) {
1043 if ((l = get_tty_line()) < 0)
1044 return ERR;
1045 else if (l == 0 || ibuf[l - 1] != '\n') {
1046 clearerr(stdin);
1047 return l ? EOF : 0;
1048 }
1049 lp = ibuf;
1050 } else if (*(lp = ibufp) == '\0')
1051 return 0;
1052 else {
1053 while (*ibufp++ != '\n')
1054 ;
1055 l = ibufp - lp;
1056 }
1057 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1058 return 0;
1059 }
1060 eot = lp + l;
1061 SPL1();
1062 do {
1063 if ((lp = put_sbuf_line(lp)) == NULL) {
1064 SPL0();
1065 return ERR;
1066 } else if (up)
1067 up->t = get_addressed_line_node(current_addr);
1068 else if ((up = push_undo_stack(UADD, current_addr,
1069 current_addr)) == NULL) {
1070 SPL0();
1071 return ERR;
1072 }
1073 } while (lp != eot);
1074 modified = 1;
1075 SPL0();
1076 }
1077 /* NOTREACHED */
1078}
1079
1080
1081/* join_lines: replace a range of lines with the joined text of those lines */
1082int
1083join_lines(long from, long to)
1084{
1085 static char *buf = NULL;
1086 static int n;
1087
1088 char *s;
1089 int size = 0;
1090 line_t *bp, *ep;
1091
1092 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1093 bp = get_addressed_line_node(from);
1094 for (; bp != ep; bp = bp->q_forw) {
1095 if ((s = get_sbuf_line(bp)) == NULL)
1096 return ERR;
1097 REALLOC(buf, n, size + bp->len, ERR);
1098 memcpy(buf + size, s, bp->len);
1099 size += bp->len;
1100 }
1101 REALLOC(buf, n, size + 2, ERR);
1102 memcpy(buf + size, "\n", 2);
1103 if (delete_lines(from, to) < 0)
1104 return ERR;
1105 current_addr = from - 1;
1106 SPL1();
1107 if (put_sbuf_line(buf) == NULL ||
1108 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1109 SPL0();
1110 return ERR;
1111 }
1112 modified = 1;
1113 SPL0();
1114 return 0;
1115}
1116
1117
1118/* move_lines: move a range of lines */
1119int
1120move_lines(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(long addr)
1165{
1166 line_t *lp, *np = get_addressed_line_node(first_addr);
1167 undo_t *up = NULL;
1168 long n = second_addr - first_addr + 1;
1169 long m = 0;
1170
1171 current_addr = addr;
1172 if (first_addr <= addr && addr < second_addr) {
1173 n = addr - first_addr + 1;
1174 m = second_addr - addr;
1175 }
1176 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1177 for (; n-- > 0; np = np->q_forw) {
1178 SPL1();
1179 if ((lp = dup_line_node(np)) == NULL) {
1180 SPL0();
1181 return ERR;
1182 }
1183 add_line_node(lp);
1184 if (up)
1185 up->t = lp;
1186 else if ((up = push_undo_stack(UADD, current_addr,
1187 current_addr)) == NULL) {
1188 SPL0();
1189 return ERR;
1190 }
1191 modified = 1;
1192 SPL0();
1193 }
1194 return 0;
1195}
1196
1197
1198/* delete_lines: delete a range of lines */
1199int
1200delete_lines(long from, long to)
1201{
1202 line_t *n, *p;
1203
1204 SPL1();
1205 if (push_undo_stack(UDEL, from, to) == NULL) {
1206 SPL0();
1207 return ERR;
1208 }
1209 n = get_addressed_line_node(INC_MOD(to, addr_last));
1210 p = get_addressed_line_node(from - 1);
1211 /* this get_addressed_line_node last! */
1212 if (isglobal)
1213 unset_active_nodes(p->q_forw, n);
1214 REQUE(p, n);
1215 addr_last -= to - from + 1;
1216 current_addr = from - 1;
1217 modified = 1;
1218 SPL0();
1219 return 0;
1220}
1221
1222
1223/* display_lines: print a range of lines to stdout */
1224int
1225display_lines(long from, long to, int gflag)
1226{
1227 line_t *bp;
1228 line_t *ep;
1229 char *s;
1230
1231 if (!from) {
1232 errmsg = "invalid address";
1233 return ERR;
1234 }
1235 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1236 bp = get_addressed_line_node(from);
1237 for (; bp != ep; bp = bp->q_forw) {
1238 if ((s = get_sbuf_line(bp)) == NULL)
1239 return ERR;
1240 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1241 return ERR;
1242 }
1243 return 0;
1244}
1245
1246
1247#define MAXMARK 26 /* max number of marks */
1248
1249line_t *mark[MAXMARK]; /* line markers */
1250int markno; /* line marker count */
1251
1252/* mark_line_node: set a line node mark */
1253int
1254mark_line_node(line_t *lp, int n)
1255{
1256 if (!islower((unsigned char)n)) {
1257 errmsg = "invalid mark character";
1258 return ERR;
1259 } else if (mark[n - 'a'] == NULL)
1260 markno++;
1261 mark[n - 'a'] = lp;
1262 return 0;
1263}
1264
1265
1266/* get_marked_node_addr: return address of a marked line */
1267long
1268get_marked_node_addr(int n)
1269{
1270 if (!islower((unsigned char)n)) {
1271 errmsg = "invalid mark character";
1272 return ERR;
1273 }
1274 return get_line_node_addr(mark[n - 'a']);
1275}
1276
1277
1278/* unmark_line_node: clear line node mark */
1279void
1280unmark_line_node(line_t *lp)
1281{
1282 int i;
1283
1284 for (i = 0; markno && i < MAXMARK; i++)
1285 if (mark[i] == lp) {
1286 mark[i] = NULL;
1287 markno--;
1288 }
1289}
1290
1291
1292/* dup_line_node: return a pointer to a copy of a line node */
1293line_t *
1294dup_line_node(line_t *lp)
1295{
1296 line_t *np;
1297
1298 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1299 fprintf(stderr, "%s\n", strerror(errno));
1300 errmsg = "out of memory";
1301 return NULL;
1302 }
1303 np->seek = lp->seek;
1304 np->len = lp->len;
1305 return np;
1306}
1307
1308
1309/* has_trailing_escape: return the parity of escapes preceding a character
1310 in a string */
1311int
1312has_trailing_escape(char *s, char *t)
1313{
1314 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1315}
1316
1317
1318/* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1319char *
1320strip_escapes(char *s)
1321{
1322 static char *file = NULL;
1323 static int filesz = 0;
1324
1325 int i = 0;
1326
1327 REALLOC(file, filesz, PATH_MAX, NULL);
1328 while (i < filesz - 1 /* Worry about a possible trailing escape */
1329 && (file[i++] = (*s == '\\') ? *++s : *s))
1330 s++;
1331 return file;
1332}
1333
1334
1335void
1336signal_hup(int signo)
1337{
1338 if (mutex)
1339 sigflags |= (1 << (signo - 1));
1340 else
1341 handle_hup(signo);
1342}
1343
1344
1345void
1346signal_int(int signo)
1347{
1348 if (mutex)
1349 sigflags |= (1 << (signo - 1));
1350 else
1351 handle_int(signo);
1352}
1353
1354
1355void
1356handle_hup(int signo)
1357{
1358 char *hup = NULL; /* hup filename */
1359 char *s;
1360 char ed_hup[] = "ed.hup";
1361 int n;
1362
1363 if (!sigactive)
1364 quit(1);
1365 sigflags &= ~(1 << (signo - 1));
1366 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 &&
1367 (s = getenv("HOME")) != NULL &&
1368 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */
1369 (hup = (char *) malloc(n + 10)) != NULL) {
1370 strcpy(hup, s);
1371 if (hup[n - 1] != '/')
1372 hup[n] = '/', hup[n+1] = '\0';
1373 strcat(hup, "ed.hup");
1374 write_file(hup, "w", 1, addr_last);
1375 }
1376 quit(2);
1377}
1378
1379
1380void
1381handle_int(int signo)
1382{
1383 if (!sigactive)
1384 quit(1);
1385 sigflags &= ~(1 << (signo - 1));
1386#ifdef _POSIX_SOURCE
1387 siglongjmp(env, -1);
1388#else
1389 longjmp(env, -1);
1390#endif
1391}
1392
1393
1394int cols = 72; /* wrap column */
1395
1396void
1397handle_winch(int signo)
1398{
1399 int save_errno = errno;
1400
1401 struct winsize ws; /* window size structure */
1402
1403 sigflags &= ~(1 << (signo - 1));
1404 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1405 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1406 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1407 }
1408 errno = save_errno;
1409}
1410
1411
1412/* is_legal_filename: return a legal filename */
1413int
1414is_legal_filename(char *s)
1415{
1416 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1417 errmsg = "shell access restricted";
1418 return 0;
1419 }
1420 return 1;
1421}
| 832 case 'z':
833#ifdef BACKWARDS
834 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
835#else
836 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
837#endif
838 return ERR;
839 else if ('0' < *ibufp && *ibufp <= '9')
840 STRTOL(rows, ibufp);
841 GET_COMMAND_SUFFIX();
842 if (display_lines(second_addr, min(addr_last,
843 second_addr + rows), gflag) < 0)
844 return ERR;
845 gflag = 0;
846 break;
847 case '=':
848 GET_COMMAND_SUFFIX();
849 printf("%ld\n", addr_cnt ? second_addr : addr_last);
850 break;
851 case '!':
852 if (addr_cnt > 0) {
853 errmsg = "unexpected address";
854 return ERR;
855 } else if ((sflags = get_shell_command()) < 0)
856 return ERR;
857 GET_COMMAND_SUFFIX();
858 if (sflags) printf("%s\n", shcmd + 1);
859 system(shcmd + 1);
860 if (!scripted) printf("!\n");
861 break;
862 case '\n':
863#ifdef BACKWARDS
864 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
865#else
866 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
867#endif
868 || display_lines(second_addr, second_addr, 0) < 0)
869 return ERR;
870 break;
871 default:
872 errmsg = "unknown command";
873 return ERR;
874 }
875 return gflag;
876}
877
878
879/* check_addr_range: return status of address range check */
880int
881check_addr_range(long n, long m)
882{
883 if (addr_cnt == 0) {
884 first_addr = n;
885 second_addr = m;
886 }
887 if (first_addr > second_addr || 1 > first_addr ||
888 second_addr > addr_last) {
889 errmsg = "invalid address";
890 return ERR;
891 }
892 return 0;
893}
894
895
896/* get_matching_node_addr: return the address of the next line matching a
897 pattern in a given direction. wrap around begin/end of editor buffer if
898 necessary */
899long
900get_matching_node_addr(pattern_t *pat, int dir)
901{
902 char *s;
903 long n = current_addr;
904 line_t *lp;
905
906 if (!pat) return ERR;
907 do {
908 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
909 lp = get_addressed_line_node(n);
910 if ((s = get_sbuf_line(lp)) == NULL)
911 return ERR;
912 if (isbinary)
913 NUL_TO_NEWLINE(s, lp->len);
914 if (!regexec(pat, s, 0, NULL, 0))
915 return n;
916 }
917 } while (n != current_addr);
918 errmsg = "no match";
919 return ERR;
920}
921
922
923/* get_filename: return pointer to copy of filename in the command buffer */
924char *
925get_filename(void)
926{
927 static char *file = NULL;
928 static int filesz = 0;
929
930 int n;
931
932 if (*ibufp != '\n') {
933 SKIP_BLANKS();
934 if (*ibufp == '\n') {
935 errmsg = "invalid filename";
936 return NULL;
937 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
938 return NULL;
939 else if (*ibufp == '!') {
940 ibufp++;
941 if ((n = get_shell_command()) < 0)
942 return NULL;
943 if (n)
944 printf("%s\n", shcmd + 1);
945 return shcmd;
946 } else if (n > PATH_MAX - 1) {
947 errmsg = "filename too long";
948 return NULL;
949 }
950 }
951#ifndef BACKWARDS
952 else if (*old_filename == '\0') {
953 errmsg = "no current filename";
954 return NULL;
955 }
956#endif
957 REALLOC(file, filesz, PATH_MAX, NULL);
958 for (n = 0; *ibufp != '\n';)
959 file[n++] = *ibufp++;
960 file[n] = '\0';
961 return is_legal_filename(file) ? file : NULL;
962}
963
964
965/* get_shell_command: read a shell command from stdin; return substitution
966 status */
967int
968get_shell_command(void)
969{
970 static char *buf = NULL;
971 static int n = 0;
972
973 char *s; /* substitution char pointer */
974 int i = 0;
975 int j = 0;
976
977 if (red) {
978 errmsg = "shell access restricted";
979 return ERR;
980 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
981 return ERR;
982 REALLOC(buf, n, j + 1, ERR);
983 buf[i++] = '!'; /* prefix command w/ bang */
984 while (*ibufp != '\n')
985 switch (*ibufp) {
986 default:
987 REALLOC(buf, n, i + 2, ERR);
988 buf[i++] = *ibufp;
989 if (*ibufp++ == '\\')
990 buf[i++] = *ibufp++;
991 break;
992 case '!':
993 if (s != ibufp) {
994 REALLOC(buf, n, i + 1, ERR);
995 buf[i++] = *ibufp++;
996 }
997#ifdef BACKWARDS
998 else if (shcmd == NULL || *(shcmd + 1) == '\0')
999#else
1000 else if (shcmd == NULL)
1001#endif
1002 {
1003 errmsg = "no previous command";
1004 return ERR;
1005 } else {
1006 REALLOC(buf, n, i + shcmdi, ERR);
1007 for (s = shcmd + 1; s < shcmd + shcmdi;)
1008 buf[i++] = *s++;
1009 s = ibufp++;
1010 }
1011 break;
1012 case '%':
1013 if (*old_filename == '\0') {
1014 errmsg = "no current filename";
1015 return ERR;
1016 }
1017 j = strlen(s = strip_escapes(old_filename));
1018 REALLOC(buf, n, i + j, ERR);
1019 while (j--)
1020 buf[i++] = *s++;
1021 s = ibufp++;
1022 break;
1023 }
1024 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1025 memcpy(shcmd, buf, i);
1026 shcmd[shcmdi = i] = '\0';
1027 return *s == '!' || *s == '%';
1028}
1029
1030
1031/* append_lines: insert text from stdin to after line n; stop when either a
1032 single period is read or EOF; return status */
1033int
1034append_lines(long n)
1035{
1036 int l;
1037 const char *lp = ibuf;
1038 const char *eot;
1039 undo_t *up = NULL;
1040
1041 for (current_addr = n;;) {
1042 if (!isglobal) {
1043 if ((l = get_tty_line()) < 0)
1044 return ERR;
1045 else if (l == 0 || ibuf[l - 1] != '\n') {
1046 clearerr(stdin);
1047 return l ? EOF : 0;
1048 }
1049 lp = ibuf;
1050 } else if (*(lp = ibufp) == '\0')
1051 return 0;
1052 else {
1053 while (*ibufp++ != '\n')
1054 ;
1055 l = ibufp - lp;
1056 }
1057 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1058 return 0;
1059 }
1060 eot = lp + l;
1061 SPL1();
1062 do {
1063 if ((lp = put_sbuf_line(lp)) == NULL) {
1064 SPL0();
1065 return ERR;
1066 } else if (up)
1067 up->t = get_addressed_line_node(current_addr);
1068 else if ((up = push_undo_stack(UADD, current_addr,
1069 current_addr)) == NULL) {
1070 SPL0();
1071 return ERR;
1072 }
1073 } while (lp != eot);
1074 modified = 1;
1075 SPL0();
1076 }
1077 /* NOTREACHED */
1078}
1079
1080
1081/* join_lines: replace a range of lines with the joined text of those lines */
1082int
1083join_lines(long from, long to)
1084{
1085 static char *buf = NULL;
1086 static int n;
1087
1088 char *s;
1089 int size = 0;
1090 line_t *bp, *ep;
1091
1092 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1093 bp = get_addressed_line_node(from);
1094 for (; bp != ep; bp = bp->q_forw) {
1095 if ((s = get_sbuf_line(bp)) == NULL)
1096 return ERR;
1097 REALLOC(buf, n, size + bp->len, ERR);
1098 memcpy(buf + size, s, bp->len);
1099 size += bp->len;
1100 }
1101 REALLOC(buf, n, size + 2, ERR);
1102 memcpy(buf + size, "\n", 2);
1103 if (delete_lines(from, to) < 0)
1104 return ERR;
1105 current_addr = from - 1;
1106 SPL1();
1107 if (put_sbuf_line(buf) == NULL ||
1108 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1109 SPL0();
1110 return ERR;
1111 }
1112 modified = 1;
1113 SPL0();
1114 return 0;
1115}
1116
1117
1118/* move_lines: move a range of lines */
1119int
1120move_lines(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(long addr)
1165{
1166 line_t *lp, *np = get_addressed_line_node(first_addr);
1167 undo_t *up = NULL;
1168 long n = second_addr - first_addr + 1;
1169 long m = 0;
1170
1171 current_addr = addr;
1172 if (first_addr <= addr && addr < second_addr) {
1173 n = addr - first_addr + 1;
1174 m = second_addr - addr;
1175 }
1176 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1177 for (; n-- > 0; np = np->q_forw) {
1178 SPL1();
1179 if ((lp = dup_line_node(np)) == NULL) {
1180 SPL0();
1181 return ERR;
1182 }
1183 add_line_node(lp);
1184 if (up)
1185 up->t = lp;
1186 else if ((up = push_undo_stack(UADD, current_addr,
1187 current_addr)) == NULL) {
1188 SPL0();
1189 return ERR;
1190 }
1191 modified = 1;
1192 SPL0();
1193 }
1194 return 0;
1195}
1196
1197
1198/* delete_lines: delete a range of lines */
1199int
1200delete_lines(long from, long to)
1201{
1202 line_t *n, *p;
1203
1204 SPL1();
1205 if (push_undo_stack(UDEL, from, to) == NULL) {
1206 SPL0();
1207 return ERR;
1208 }
1209 n = get_addressed_line_node(INC_MOD(to, addr_last));
1210 p = get_addressed_line_node(from - 1);
1211 /* this get_addressed_line_node last! */
1212 if (isglobal)
1213 unset_active_nodes(p->q_forw, n);
1214 REQUE(p, n);
1215 addr_last -= to - from + 1;
1216 current_addr = from - 1;
1217 modified = 1;
1218 SPL0();
1219 return 0;
1220}
1221
1222
1223/* display_lines: print a range of lines to stdout */
1224int
1225display_lines(long from, long to, int gflag)
1226{
1227 line_t *bp;
1228 line_t *ep;
1229 char *s;
1230
1231 if (!from) {
1232 errmsg = "invalid address";
1233 return ERR;
1234 }
1235 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1236 bp = get_addressed_line_node(from);
1237 for (; bp != ep; bp = bp->q_forw) {
1238 if ((s = get_sbuf_line(bp)) == NULL)
1239 return ERR;
1240 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1241 return ERR;
1242 }
1243 return 0;
1244}
1245
1246
1247#define MAXMARK 26 /* max number of marks */
1248
1249line_t *mark[MAXMARK]; /* line markers */
1250int markno; /* line marker count */
1251
1252/* mark_line_node: set a line node mark */
1253int
1254mark_line_node(line_t *lp, int n)
1255{
1256 if (!islower((unsigned char)n)) {
1257 errmsg = "invalid mark character";
1258 return ERR;
1259 } else if (mark[n - 'a'] == NULL)
1260 markno++;
1261 mark[n - 'a'] = lp;
1262 return 0;
1263}
1264
1265
1266/* get_marked_node_addr: return address of a marked line */
1267long
1268get_marked_node_addr(int n)
1269{
1270 if (!islower((unsigned char)n)) {
1271 errmsg = "invalid mark character";
1272 return ERR;
1273 }
1274 return get_line_node_addr(mark[n - 'a']);
1275}
1276
1277
1278/* unmark_line_node: clear line node mark */
1279void
1280unmark_line_node(line_t *lp)
1281{
1282 int i;
1283
1284 for (i = 0; markno && i < MAXMARK; i++)
1285 if (mark[i] == lp) {
1286 mark[i] = NULL;
1287 markno--;
1288 }
1289}
1290
1291
1292/* dup_line_node: return a pointer to a copy of a line node */
1293line_t *
1294dup_line_node(line_t *lp)
1295{
1296 line_t *np;
1297
1298 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1299 fprintf(stderr, "%s\n", strerror(errno));
1300 errmsg = "out of memory";
1301 return NULL;
1302 }
1303 np->seek = lp->seek;
1304 np->len = lp->len;
1305 return np;
1306}
1307
1308
1309/* has_trailing_escape: return the parity of escapes preceding a character
1310 in a string */
1311int
1312has_trailing_escape(char *s, char *t)
1313{
1314 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1315}
1316
1317
1318/* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1319char *
1320strip_escapes(char *s)
1321{
1322 static char *file = NULL;
1323 static int filesz = 0;
1324
1325 int i = 0;
1326
1327 REALLOC(file, filesz, PATH_MAX, NULL);
1328 while (i < filesz - 1 /* Worry about a possible trailing escape */
1329 && (file[i++] = (*s == '\\') ? *++s : *s))
1330 s++;
1331 return file;
1332}
1333
1334
1335void
1336signal_hup(int signo)
1337{
1338 if (mutex)
1339 sigflags |= (1 << (signo - 1));
1340 else
1341 handle_hup(signo);
1342}
1343
1344
1345void
1346signal_int(int signo)
1347{
1348 if (mutex)
1349 sigflags |= (1 << (signo - 1));
1350 else
1351 handle_int(signo);
1352}
1353
1354
1355void
1356handle_hup(int signo)
1357{
1358 char *hup = NULL; /* hup filename */
1359 char *s;
1360 char ed_hup[] = "ed.hup";
1361 int n;
1362
1363 if (!sigactive)
1364 quit(1);
1365 sigflags &= ~(1 << (signo - 1));
1366 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 &&
1367 (s = getenv("HOME")) != NULL &&
1368 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */
1369 (hup = (char *) malloc(n + 10)) != NULL) {
1370 strcpy(hup, s);
1371 if (hup[n - 1] != '/')
1372 hup[n] = '/', hup[n+1] = '\0';
1373 strcat(hup, "ed.hup");
1374 write_file(hup, "w", 1, addr_last);
1375 }
1376 quit(2);
1377}
1378
1379
1380void
1381handle_int(int signo)
1382{
1383 if (!sigactive)
1384 quit(1);
1385 sigflags &= ~(1 << (signo - 1));
1386#ifdef _POSIX_SOURCE
1387 siglongjmp(env, -1);
1388#else
1389 longjmp(env, -1);
1390#endif
1391}
1392
1393
1394int cols = 72; /* wrap column */
1395
1396void
1397handle_winch(int signo)
1398{
1399 int save_errno = errno;
1400
1401 struct winsize ws; /* window size structure */
1402
1403 sigflags &= ~(1 << (signo - 1));
1404 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1405 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1406 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1407 }
1408 errno = save_errno;
1409}
1410
1411
1412/* is_legal_filename: return a legal filename */
1413int
1414is_legal_filename(char *s)
1415{
1416 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1417 errmsg = "shell access restricted";
1418 return 0;
1419 }
1420 return 1;
1421}
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