1 /* main.c: This file contains the main control and user-interface routines
2 for the ed line editor. */
3 /*-
4 * Copyright (c) 1993 Andrew Moore, Talke Studio.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #ifndef lint
30 #if 0
31 static const char copyright[] =
32 "@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\
33 All rights reserved.\n";
34 #endif
35 #endif /* not lint */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: stable/12/bin/ed/main.c 320603 2017-07-03 15:54:44Z pfg $");
39
40 /*
41 * CREDITS
42 *
43 * This program is based on the editor algorithm described in
44 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
45 * in Pascal," Addison-Wesley, 1981.
46 *
47 * The buffering algorithm is attributed to Rodney Ruddock of
48 * the University of Guelph, Guelph, Ontario.
49 *
50 * The cbc.c encryption code is adapted from
51 * the bdes program by Matt Bishop of Dartmouth College,
52 * Hanover, NH.
53 *
54 */
55
56 #include <sys/types.h>
57
58 #include <sys/ioctl.h>
59 #include <sys/wait.h>
60 #include <ctype.h>
61 #include <locale.h>
62 #include <pwd.h>
63 #include <setjmp.h>
64
65 #include "ed.h"
66
67
68 #ifdef _POSIX_SOURCE
69 static sigjmp_buf env;
70 #else
71 static jmp_buf env;
72 #endif
73
74 /* static buffers */
75 char stdinbuf[1]; /* stdin buffer */
76 static char *shcmd; /* shell command buffer */
77 static int shcmdsz; /* shell command buffer size */
78 static int shcmdi; /* shell command buffer index */
79 char *ibuf; /* ed command-line buffer */
80 int ibufsz; /* ed command-line buffer size */
81 char *ibufp; /* pointer to ed command-line buffer */
82
83 /* global flags */
84 int des = 0; /* if set, use crypt(3) for i/o */
85 static int garrulous = 0; /* if set, print all error messages */
86 int isbinary; /* if set, buffer contains ASCII NULs */
87 int isglobal; /* if set, doing a global command */
88 int modified; /* if set, buffer modified since last write */
89 int mutex = 0; /* if set, signals set "sigflags" */
90 static int red = 0; /* if set, restrict shell/directory access */
91 int scripted = 0; /* if set, suppress diagnostics */
92 int sigflags = 0; /* if set, signals received while mutex set */
93 static int sigactive = 0; /* if set, signal handlers are enabled */
94
95 static char old_filename[PATH_MAX] = ""; /* default filename */
96 long current_addr; /* current address in editor buffer */
97 long addr_last; /* last address in editor buffer */
98 int lineno; /* script line number */
99 static const char *prompt; /* command-line prompt */
100 static const char *dps = "*"; /* default command-line prompt */
101
102 static const char *usage = "usage: %s [-] [-sx] [-p string] [file]\n";
103
104 /* ed: line editor */
105 int
main(volatile int argc,char ** volatile argv)106 main(volatile int argc, char ** volatile argv)
107 {
108 int c, n;
109 long status = 0;
110
111 (void)setlocale(LC_ALL, "");
112
113 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
114 top:
115 while ((c = getopt(argc, argv, "p:sx")) != -1)
116 switch(c) {
117 case 'p': /* set prompt */
118 prompt = optarg;
119 break;
120 case 's': /* run script */
121 scripted = 1;
122 break;
123 case 'x': /* use crypt */
124 #ifdef DES
125 des = get_keyword();
126 #else
127 fprintf(stderr, "crypt unavailable\n?\n");
128 #endif
129 break;
130
131 default:
132 fprintf(stderr, usage, red ? "red" : "ed");
133 exit(1);
134 }
135 argv += optind;
136 argc -= optind;
137 if (argc && **argv == '-') {
138 scripted = 1;
139 if (argc > 1) {
140 optind = 1;
141 goto top;
142 }
143 argv++;
144 argc--;
145 }
146 /* assert: reliable signals! */
147 #ifdef SIGWINCH
148 handle_winch(SIGWINCH);
149 if (isatty(0)) signal(SIGWINCH, handle_winch);
150 #endif
151 signal(SIGHUP, signal_hup);
152 signal(SIGQUIT, SIG_IGN);
153 signal(SIGINT, signal_int);
154 #ifdef _POSIX_SOURCE
155 if ((status = sigsetjmp(env, 1)))
156 #else
157 if ((status = setjmp(env)))
158 #endif
159 {
160 fputs("\n?\n", stderr);
161 errmsg = "interrupt";
162 } else {
163 init_buffers();
164 sigactive = 1; /* enable signal handlers */
165 if (argc && **argv && is_legal_filename(*argv)) {
166 if (read_file(*argv, 0) < 0 && !isatty(0))
167 quit(2);
168 else if (**argv != '!')
169 if (strlcpy(old_filename, *argv, sizeof(old_filename))
170 >= sizeof(old_filename))
171 quit(2);
172 } else if (argc) {
173 fputs("?\n", stderr);
174 if (**argv == '\0')
175 errmsg = "invalid filename";
176 if (!isatty(0))
177 quit(2);
178 }
179 }
180 for (;;) {
181 if (status < 0 && garrulous)
182 fprintf(stderr, "%s\n", errmsg);
183 if (prompt) {
184 printf("%s", prompt);
185 fflush(stdout);
186 }
187 if ((n = get_tty_line()) < 0) {
188 status = ERR;
189 continue;
190 } else if (n == 0) {
191 if (modified && !scripted) {
192 fputs("?\n", stderr);
193 errmsg = "warning: file modified";
194 if (!isatty(0)) {
195 if (garrulous)
196 fprintf(stderr,
197 "script, line %d: %s\n",
198 lineno, errmsg);
199 quit(2);
200 }
201 clearerr(stdin);
202 modified = 0;
203 status = EMOD;
204 continue;
205 } else
206 quit(0);
207 } else if (ibuf[n - 1] != '\n') {
208 /* discard line */
209 errmsg = "unexpected end-of-file";
210 clearerr(stdin);
211 status = ERR;
212 continue;
213 }
214 isglobal = 0;
215 if ((status = extract_addr_range()) >= 0 &&
216 (status = exec_command()) >= 0)
217 if (!status ||
218 (status = display_lines(current_addr, current_addr,
219 status)) >= 0)
220 continue;
221 switch (status) {
222 case EOF:
223 quit(0);
224 case EMOD:
225 modified = 0;
226 fputs("?\n", stderr); /* give warning */
227 errmsg = "warning: file modified";
228 if (!isatty(0)) {
229 if (garrulous)
230 fprintf(stderr, "script, line %d: %s\n",
231 lineno, errmsg);
232 quit(2);
233 }
234 break;
235 case FATAL:
236 if (!isatty(0)) {
237 if (garrulous)
238 fprintf(stderr, "script, line %d: %s\n",
239 lineno, errmsg);
240 } else if (garrulous)
241 fprintf(stderr, "%s\n", errmsg);
242 quit(3);
243 default:
244 fputs("?\n", stderr);
245 if (!isatty(0)) {
246 if (garrulous)
247 fprintf(stderr, "script, line %d: %s\n",
248 lineno, errmsg);
249 quit(2);
250 }
251 break;
252 }
253 }
254 /*NOTREACHED*/
255 }
256
257 long first_addr, second_addr;
258 static long addr_cnt;
259
260 /* extract_addr_range: get line addresses from the command buffer until an
261 illegal address is seen; return status */
262 int
extract_addr_range(void)263 extract_addr_range(void)
264 {
265 long addr;
266
267 addr_cnt = 0;
268 first_addr = second_addr = current_addr;
269 while ((addr = next_addr()) >= 0) {
270 addr_cnt++;
271 first_addr = second_addr;
272 second_addr = addr;
273 if (*ibufp != ',' && *ibufp != ';')
274 break;
275 else if (*ibufp++ == ';')
276 current_addr = addr;
277 }
278 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
279 first_addr = second_addr;
280 return (addr == ERR) ? ERR : 0;
281 }
282
283
284 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
285
286 #define MUST_BE_FIRST() do { \
287 if (!first) { \
288 errmsg = "invalid address"; \
289 return ERR; \
290 } \
291 } while (0)
292
293 /* next_addr: return the next line address in the command buffer */
294 long
next_addr(void)295 next_addr(void)
296 {
297 const char *hd;
298 long addr = current_addr;
299 long n;
300 int first = 1;
301 int c;
302
303 SKIP_BLANKS();
304 for (hd = ibufp;; first = 0)
305 switch (c = *ibufp) {
306 case '+':
307 case '\t':
308 case ' ':
309 case '-':
310 case '^':
311 ibufp++;
312 SKIP_BLANKS();
313 if (isdigit((unsigned char)*ibufp)) {
314 STRTOL(n, ibufp);
315 addr += (c == '-' || c == '^') ? -n : n;
316 } else if (!isspace((unsigned char)c))
317 addr += (c == '-' || c == '^') ? -1 : 1;
318 break;
319 case '0': case '1': case '2':
320 case '3': case '4': case '5':
321 case '6': case '7': case '8': case '9':
322 MUST_BE_FIRST();
323 STRTOL(addr, ibufp);
324 break;
325 case '.':
326 case '$':
327 MUST_BE_FIRST();
328 ibufp++;
329 addr = (c == '.') ? current_addr : addr_last;
330 break;
331 case '/':
332 case '?':
333 MUST_BE_FIRST();
334 if ((addr = get_matching_node_addr(
335 get_compiled_pattern(), c == '/')) < 0)
336 return ERR;
337 else if (c == *ibufp)
338 ibufp++;
339 break;
340 case '\'':
341 MUST_BE_FIRST();
342 ibufp++;
343 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
344 return ERR;
345 break;
346 case '%':
347 case ',':
348 case ';':
349 if (first) {
350 ibufp++;
351 addr_cnt++;
352 second_addr = (c == ';') ? current_addr : 1;
353 if ((addr = next_addr()) < 0)
354 addr = addr_last;
355 break;
356 }
357 /* FALLTHROUGH */
358 default:
359 if (ibufp == hd)
360 return EOF;
361 else if (addr < 0 || addr_last < addr) {
362 errmsg = "invalid address";
363 return ERR;
364 } else
365 return addr;
366 }
367 /* NOTREACHED */
368 }
369
370
371 #ifdef BACKWARDS
372 /* GET_THIRD_ADDR: get a legal address from the command buffer */
373 #define GET_THIRD_ADDR(addr) \
374 { \
375 long ol1, ol2; \
376 \
377 ol1 = first_addr, ol2 = second_addr; \
378 if (extract_addr_range() < 0) \
379 return ERR; \
380 else if (addr_cnt == 0) { \
381 errmsg = "destination expected"; \
382 return ERR; \
383 } else if (second_addr < 0 || addr_last < second_addr) { \
384 errmsg = "invalid address"; \
385 return ERR; \
386 } \
387 addr = second_addr; \
388 first_addr = ol1, second_addr = ol2; \
389 }
390 #else /* BACKWARDS */
391 /* GET_THIRD_ADDR: get a legal address from the command buffer */
392 #define GET_THIRD_ADDR(addr) \
393 { \
394 long ol1, ol2; \
395 \
396 ol1 = first_addr, ol2 = second_addr; \
397 if (extract_addr_range() < 0) \
398 return ERR; \
399 if (second_addr < 0 || addr_last < second_addr) { \
400 errmsg = "invalid address"; \
401 return ERR; \
402 } \
403 addr = second_addr; \
404 first_addr = ol1, second_addr = ol2; \
405 }
406 #endif
407
408
409 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
410 #define GET_COMMAND_SUFFIX() { \
411 int done = 0; \
412 do { \
413 switch(*ibufp) { \
414 case 'p': \
415 gflag |= GPR, ibufp++; \
416 break; \
417 case 'l': \
418 gflag |= GLS, ibufp++; \
419 break; \
420 case 'n': \
421 gflag |= GNP, ibufp++; \
422 break; \
423 default: \
424 done++; \
425 } \
426 } while (!done); \
427 if (*ibufp++ != '\n') { \
428 errmsg = "invalid command suffix"; \
429 return ERR; \
430 } \
431 }
432
433
434 /* sflags */
435 #define SGG 001 /* complement previous global substitute suffix */
436 #define SGP 002 /* complement previous print suffix */
437 #define SGR 004 /* use last regex instead of last pat */
438 #define SGF 010 /* repeat last substitution */
439
440 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
441
442 long rows = 22; /* scroll length: ws_row - 2 */
443
444 /* exec_command: execute the next command in command buffer; return print
445 request, if any */
446 int
exec_command(void)447 exec_command(void)
448 {
449 static pattern_t *pat = NULL;
450 static int sgflag = 0;
451 static long sgnum = 0;
452
453 pattern_t *tpat;
454 char *fnp;
455 int gflag = 0;
456 int sflags = 0;
457 long addr = 0;
458 int n = 0;
459 int c;
460
461 SKIP_BLANKS();
462 switch(c = *ibufp++) {
463 case 'a':
464 GET_COMMAND_SUFFIX();
465 if (!isglobal) clear_undo_stack();
466 if (append_lines(second_addr) < 0)
467 return ERR;
468 break;
469 case 'c':
470 if (check_addr_range(current_addr, current_addr) < 0)
471 return ERR;
472 GET_COMMAND_SUFFIX();
473 if (!isglobal) clear_undo_stack();
474 if (delete_lines(first_addr, second_addr) < 0 ||
475 append_lines(current_addr) < 0)
476 return ERR;
477 break;
478 case 'd':
479 if (check_addr_range(current_addr, current_addr) < 0)
480 return ERR;
481 GET_COMMAND_SUFFIX();
482 if (!isglobal) clear_undo_stack();
483 if (delete_lines(first_addr, second_addr) < 0)
484 return ERR;
485 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
486 current_addr = addr;
487 break;
488 case 'e':
489 if (modified && !scripted)
490 return EMOD;
491 /* FALLTHROUGH */
492 case 'E':
493 if (addr_cnt > 0) {
494 errmsg = "unexpected address";
495 return ERR;
496 } else if (!isspace((unsigned char)*ibufp)) {
497 errmsg = "unexpected command suffix";
498 return ERR;
499 } else if ((fnp = get_filename()) == NULL)
500 return ERR;
501 GET_COMMAND_SUFFIX();
502 if (delete_lines(1, addr_last) < 0)
503 return ERR;
504 clear_undo_stack();
505 if (close_sbuf() < 0)
506 return ERR;
507 else if (open_sbuf() < 0)
508 return FATAL;
509 if (*fnp && *fnp != '!')
510 strlcpy(old_filename, fnp, PATH_MAX);
511 #ifdef BACKWARDS
512 if (*fnp == '\0' && *old_filename == '\0') {
513 errmsg = "no current filename";
514 return ERR;
515 }
516 #endif
517 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
518 return ERR;
519 clear_undo_stack();
520 modified = 0;
521 u_current_addr = u_addr_last = -1;
522 break;
523 case 'f':
524 if (addr_cnt > 0) {
525 errmsg = "unexpected address";
526 return ERR;
527 } else if (!isspace((unsigned char)*ibufp)) {
528 errmsg = "unexpected command suffix";
529 return ERR;
530 } else if ((fnp = get_filename()) == NULL)
531 return ERR;
532 else if (*fnp == '!') {
533 errmsg = "invalid redirection";
534 return ERR;
535 }
536 GET_COMMAND_SUFFIX();
537 if (*fnp)
538 strlcpy(old_filename, fnp, PATH_MAX);
539 printf("%s\n", strip_escapes(old_filename));
540 break;
541 case 'g':
542 case 'v':
543 case 'G':
544 case 'V':
545 if (isglobal) {
546 errmsg = "cannot nest global commands";
547 return ERR;
548 } else if (check_addr_range(1, addr_last) < 0)
549 return ERR;
550 else if (build_active_list(c == 'g' || c == 'G') < 0)
551 return ERR;
552 else if ((n = (c == 'G' || c == 'V')))
553 GET_COMMAND_SUFFIX();
554 isglobal++;
555 if (exec_global(n, gflag) < 0)
556 return ERR;
557 break;
558 case 'h':
559 if (addr_cnt > 0) {
560 errmsg = "unexpected address";
561 return ERR;
562 }
563 GET_COMMAND_SUFFIX();
564 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
565 break;
566 case 'H':
567 if (addr_cnt > 0) {
568 errmsg = "unexpected address";
569 return ERR;
570 }
571 GET_COMMAND_SUFFIX();
572 if ((garrulous = 1 - garrulous) && *errmsg)
573 fprintf(stderr, "%s\n", errmsg);
574 break;
575 case 'i':
576 if (second_addr == 0) {
577 errmsg = "invalid address";
578 return ERR;
579 }
580 GET_COMMAND_SUFFIX();
581 if (!isglobal) clear_undo_stack();
582 if (append_lines(second_addr - 1) < 0)
583 return ERR;
584 break;
585 case 'j':
586 if (check_addr_range(current_addr, current_addr + 1) < 0)
587 return ERR;
588 GET_COMMAND_SUFFIX();
589 if (!isglobal) clear_undo_stack();
590 if (first_addr != second_addr &&
591 join_lines(first_addr, second_addr) < 0)
592 return ERR;
593 break;
594 case 'k':
595 c = *ibufp++;
596 if (second_addr == 0) {
597 errmsg = "invalid address";
598 return ERR;
599 }
600 GET_COMMAND_SUFFIX();
601 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
602 return ERR;
603 break;
604 case 'l':
605 if (check_addr_range(current_addr, current_addr) < 0)
606 return ERR;
607 GET_COMMAND_SUFFIX();
608 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
609 return ERR;
610 gflag = 0;
611 break;
612 case 'm':
613 if (check_addr_range(current_addr, current_addr) < 0)
614 return ERR;
615 GET_THIRD_ADDR(addr);
616 if (first_addr <= addr && addr < second_addr) {
617 errmsg = "invalid destination";
618 return ERR;
619 }
620 GET_COMMAND_SUFFIX();
621 if (!isglobal) clear_undo_stack();
622 if (move_lines(addr) < 0)
623 return ERR;
624 break;
625 case 'n':
626 if (check_addr_range(current_addr, current_addr) < 0)
627 return ERR;
628 GET_COMMAND_SUFFIX();
629 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
630 return ERR;
631 gflag = 0;
632 break;
633 case 'p':
634 if (check_addr_range(current_addr, current_addr) < 0)
635 return ERR;
636 GET_COMMAND_SUFFIX();
637 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
638 return ERR;
639 gflag = 0;
640 break;
641 case 'P':
642 if (addr_cnt > 0) {
643 errmsg = "unexpected address";
644 return ERR;
645 }
646 GET_COMMAND_SUFFIX();
647 prompt = prompt ? NULL : optarg ? optarg : dps;
648 break;
649 case 'q':
650 case 'Q':
651 if (addr_cnt > 0) {
652 errmsg = "unexpected address";
653 return ERR;
654 }
655 GET_COMMAND_SUFFIX();
656 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
657 break;
658 case 'r':
659 if (!isspace((unsigned char)*ibufp)) {
660 errmsg = "unexpected command suffix";
661 return ERR;
662 } else if (addr_cnt == 0)
663 second_addr = addr_last;
664 if ((fnp = get_filename()) == NULL)
665 return ERR;
666 GET_COMMAND_SUFFIX();
667 if (!isglobal) clear_undo_stack();
668 if (*old_filename == '\0' && *fnp != '!')
669 strlcpy(old_filename, fnp, PATH_MAX);
670 #ifdef BACKWARDS
671 if (*fnp == '\0' && *old_filename == '\0') {
672 errmsg = "no current filename";
673 return ERR;
674 }
675 #endif
676 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
677 return ERR;
678 else if (addr && addr != addr_last)
679 modified = 1;
680 break;
681 case 's':
682 do {
683 switch(*ibufp) {
684 case '\n':
685 sflags |=SGF;
686 break;
687 case 'g':
688 sflags |= SGG;
689 ibufp++;
690 break;
691 case 'p':
692 sflags |= SGP;
693 ibufp++;
694 break;
695 case 'r':
696 sflags |= SGR;
697 ibufp++;
698 break;
699 case '0': case '1': case '2': case '3': case '4':
700 case '5': case '6': case '7': case '8': case '9':
701 STRTOL(sgnum, ibufp);
702 sflags |= SGF;
703 sgflag &= ~GSG; /* override GSG */
704 break;
705 default:
706 if (sflags) {
707 errmsg = "invalid command suffix";
708 return ERR;
709 }
710 }
711 } while (sflags && *ibufp != '\n');
712 if (sflags && !pat) {
713 errmsg = "no previous substitution";
714 return ERR;
715 } else if (sflags & SGG)
716 sgnum = 0; /* override numeric arg */
717 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
718 errmsg = "invalid pattern delimiter";
719 return ERR;
720 }
721 tpat = pat;
722 SPL1();
723 if ((!sflags || (sflags & SGR)) &&
724 (tpat = get_compiled_pattern()) == NULL) {
725 SPL0();
726 return ERR;
727 } else if (tpat != pat) {
728 if (pat) {
729 regfree(pat);
730 free(pat);
731 }
732 pat = tpat;
733 patlock = 1; /* reserve pattern */
734 }
735 SPL0();
736 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
737 return ERR;
738 else if (isglobal)
739 sgflag |= GLB;
740 else
741 sgflag &= ~GLB;
742 if (sflags & SGG)
743 sgflag ^= GSG;
744 if (sflags & SGP)
745 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
746 do {
747 switch(*ibufp) {
748 case 'p':
749 sgflag |= GPR, ibufp++;
750 break;
751 case 'l':
752 sgflag |= GLS, ibufp++;
753 break;
754 case 'n':
755 sgflag |= GNP, ibufp++;
756 break;
757 default:
758 n++;
759 }
760 } while (!n);
761 if (check_addr_range(current_addr, current_addr) < 0)
762 return ERR;
763 GET_COMMAND_SUFFIX();
764 if (!isglobal) clear_undo_stack();
765 if (search_and_replace(pat, sgflag, sgnum) < 0)
766 return ERR;
767 break;
768 case 't':
769 if (check_addr_range(current_addr, current_addr) < 0)
770 return ERR;
771 GET_THIRD_ADDR(addr);
772 GET_COMMAND_SUFFIX();
773 if (!isglobal) clear_undo_stack();
774 if (copy_lines(addr) < 0)
775 return ERR;
776 break;
777 case 'u':
778 if (addr_cnt > 0) {
779 errmsg = "unexpected address";
780 return ERR;
781 }
782 GET_COMMAND_SUFFIX();
783 if (pop_undo_stack() < 0)
784 return ERR;
785 break;
786 case 'w':
787 case 'W':
788 if ((n = *ibufp) == 'q' || n == 'Q') {
789 gflag = EOF;
790 ibufp++;
791 }
792 if (!isspace((unsigned char)*ibufp)) {
793 errmsg = "unexpected command suffix";
794 return ERR;
795 } else if ((fnp = get_filename()) == NULL)
796 return ERR;
797 if (addr_cnt == 0 && !addr_last)
798 first_addr = second_addr = 0;
799 else if (check_addr_range(1, addr_last) < 0)
800 return ERR;
801 GET_COMMAND_SUFFIX();
802 if (*old_filename == '\0' && *fnp != '!')
803 strlcpy(old_filename, fnp, PATH_MAX);
804 #ifdef BACKWARDS
805 if (*fnp == '\0' && *old_filename == '\0') {
806 errmsg = "no current filename";
807 return ERR;
808 }
809 #endif
810 if ((addr = write_file(*fnp ? fnp : old_filename,
811 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
812 return ERR;
813 else if (addr == addr_last && *fnp != '!')
814 modified = 0;
815 else if (modified && !scripted && n == 'q')
816 gflag = EMOD;
817 break;
818 case 'x':
819 if (addr_cnt > 0) {
820 errmsg = "unexpected address";
821 return ERR;
822 }
823 GET_COMMAND_SUFFIX();
824 #ifdef DES
825 des = get_keyword();
826 break;
827 #else
828 errmsg = "crypt unavailable";
829 return ERR;
830 #endif
831 case 'z':
832 #ifdef BACKWARDS
833 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
834 #else
835 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
836 #endif
837 return ERR;
838 else if ('0' < *ibufp && *ibufp <= '9')
839 STRTOL(rows, ibufp);
840 GET_COMMAND_SUFFIX();
841 if (display_lines(second_addr, min(addr_last,
842 second_addr + rows), gflag) < 0)
843 return ERR;
844 gflag = 0;
845 break;
846 case '=':
847 GET_COMMAND_SUFFIX();
848 printf("%ld\n", addr_cnt ? second_addr : addr_last);
849 break;
850 case '!':
851 if (addr_cnt > 0) {
852 errmsg = "unexpected address";
853 return ERR;
854 } else if ((sflags = get_shell_command()) < 0)
855 return ERR;
856 GET_COMMAND_SUFFIX();
857 if (sflags) printf("%s\n", shcmd + 1);
858 system(shcmd + 1);
859 if (!scripted) printf("!\n");
860 break;
861 case '\n':
862 #ifdef BACKWARDS
863 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
864 #else
865 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
866 #endif
867 || display_lines(second_addr, second_addr, 0) < 0)
868 return ERR;
869 break;
870 default:
871 errmsg = "unknown command";
872 return ERR;
873 }
874 return gflag;
875 }
876
877
878 /* check_addr_range: return status of address range check */
879 int
check_addr_range(long n,long m)880 check_addr_range(long n, long m)
881 {
882 if (addr_cnt == 0) {
883 first_addr = n;
884 second_addr = m;
885 }
886 if (first_addr > second_addr || 1 > first_addr ||
887 second_addr > addr_last) {
888 errmsg = "invalid address";
889 return ERR;
890 }
891 return 0;
892 }
893
894
895 /* get_matching_node_addr: return the address of the next line matching a
896 pattern in a given direction. wrap around begin/end of editor buffer if
897 necessary */
898 long
get_matching_node_addr(pattern_t * pat,int dir)899 get_matching_node_addr(pattern_t *pat, int dir)
900 {
901 char *s;
902 long n = current_addr;
903 line_t *lp;
904
905 if (!pat) return ERR;
906 do {
907 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
908 lp = get_addressed_line_node(n);
909 if ((s = get_sbuf_line(lp)) == NULL)
910 return ERR;
911 if (isbinary)
912 NUL_TO_NEWLINE(s, lp->len);
913 if (!regexec(pat, s, 0, NULL, 0))
914 return n;
915 }
916 } while (n != current_addr);
917 errmsg = "no match";
918 return ERR;
919 }
920
921
922 /* get_filename: return pointer to copy of filename in the command buffer */
923 char *
get_filename(void)924 get_filename(void)
925 {
926 static char *file = NULL;
927 static int filesz = 0;
928
929 int n;
930
931 if (*ibufp != '\n') {
932 SKIP_BLANKS();
933 if (*ibufp == '\n') {
934 errmsg = "invalid filename";
935 return NULL;
936 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
937 return NULL;
938 else if (*ibufp == '!') {
939 ibufp++;
940 if ((n = get_shell_command()) < 0)
941 return NULL;
942 if (n)
943 printf("%s\n", shcmd + 1);
944 return shcmd;
945 } else if (n > PATH_MAX - 1) {
946 errmsg = "filename too long";
947 return NULL;
948 }
949 }
950 #ifndef BACKWARDS
951 else if (*old_filename == '\0') {
952 errmsg = "no current filename";
953 return NULL;
954 }
955 #endif
956 REALLOC(file, filesz, PATH_MAX, NULL);
957 for (n = 0; *ibufp != '\n';)
958 file[n++] = *ibufp++;
959 file[n] = '\0';
960 return is_legal_filename(file) ? file : NULL;
961 }
962
963
964 /* get_shell_command: read a shell command from stdin; return substitution
965 status */
966 int
get_shell_command(void)967 get_shell_command(void)
968 {
969 static char *buf = NULL;
970 static int n = 0;
971
972 char *s; /* substitution char pointer */
973 int i = 0;
974 int j = 0;
975
976 if (red) {
977 errmsg = "shell access restricted";
978 return ERR;
979 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
980 return ERR;
981 REALLOC(buf, n, j + 1, ERR);
982 buf[i++] = '!'; /* prefix command w/ bang */
983 while (*ibufp != '\n')
984 switch (*ibufp) {
985 default:
986 REALLOC(buf, n, i + 2, ERR);
987 buf[i++] = *ibufp;
988 if (*ibufp++ == '\\')
989 buf[i++] = *ibufp++;
990 break;
991 case '!':
992 if (s != ibufp) {
993 REALLOC(buf, n, i + 1, ERR);
994 buf[i++] = *ibufp++;
995 }
996 #ifdef BACKWARDS
997 else if (shcmd == NULL || *(shcmd + 1) == '\0')
998 #else
999 else if (shcmd == NULL)
1000 #endif
1001 {
1002 errmsg = "no previous command";
1003 return ERR;
1004 } else {
1005 REALLOC(buf, n, i + shcmdi, ERR);
1006 for (s = shcmd + 1; s < shcmd + shcmdi;)
1007 buf[i++] = *s++;
1008 s = ibufp++;
1009 }
1010 break;
1011 case '%':
1012 if (*old_filename == '\0') {
1013 errmsg = "no current filename";
1014 return ERR;
1015 }
1016 j = strlen(s = strip_escapes(old_filename));
1017 REALLOC(buf, n, i + j, ERR);
1018 while (j--)
1019 buf[i++] = *s++;
1020 s = ibufp++;
1021 break;
1022 }
1023 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1024 memcpy(shcmd, buf, i);
1025 shcmd[shcmdi = i] = '\0';
1026 return *s == '!' || *s == '%';
1027 }
1028
1029
1030 /* append_lines: insert text from stdin to after line n; stop when either a
1031 single period is read or EOF; return status */
1032 int
append_lines(long n)1033 append_lines(long n)
1034 {
1035 int l;
1036 const char *lp = ibuf;
1037 const char *eot;
1038 undo_t *up = NULL;
1039
1040 for (current_addr = n;;) {
1041 if (!isglobal) {
1042 if ((l = get_tty_line()) < 0)
1043 return ERR;
1044 else if (l == 0 || ibuf[l - 1] != '\n') {
1045 clearerr(stdin);
1046 return l ? EOF : 0;
1047 }
1048 lp = ibuf;
1049 } else if (*(lp = ibufp) == '\0')
1050 return 0;
1051 else {
1052 while (*ibufp++ != '\n')
1053 ;
1054 l = ibufp - lp;
1055 }
1056 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1057 return 0;
1058 }
1059 eot = lp + l;
1060 SPL1();
1061 do {
1062 if ((lp = put_sbuf_line(lp)) == NULL) {
1063 SPL0();
1064 return ERR;
1065 } else if (up)
1066 up->t = get_addressed_line_node(current_addr);
1067 else if ((up = push_undo_stack(UADD, current_addr,
1068 current_addr)) == NULL) {
1069 SPL0();
1070 return ERR;
1071 }
1072 } while (lp != eot);
1073 modified = 1;
1074 SPL0();
1075 }
1076 /* NOTREACHED */
1077 }
1078
1079
1080 /* join_lines: replace a range of lines with the joined text of those lines */
1081 int
join_lines(long from,long to)1082 join_lines(long from, long to)
1083 {
1084 static char *buf = NULL;
1085 static int n;
1086
1087 char *s;
1088 int size = 0;
1089 line_t *bp, *ep;
1090
1091 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1092 bp = get_addressed_line_node(from);
1093 for (; bp != ep; bp = bp->q_forw) {
1094 if ((s = get_sbuf_line(bp)) == NULL)
1095 return ERR;
1096 REALLOC(buf, n, size + bp->len, ERR);
1097 memcpy(buf + size, s, bp->len);
1098 size += bp->len;
1099 }
1100 REALLOC(buf, n, size + 2, ERR);
1101 memcpy(buf + size, "\n", 2);
1102 if (delete_lines(from, to) < 0)
1103 return ERR;
1104 current_addr = from - 1;
1105 SPL1();
1106 if (put_sbuf_line(buf) == NULL ||
1107 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1108 SPL0();
1109 return ERR;
1110 }
1111 modified = 1;
1112 SPL0();
1113 return 0;
1114 }
1115
1116
1117 /* move_lines: move a range of lines */
1118 int
move_lines(long addr)1119 move_lines(long addr)
1120 {
1121 line_t *b1, *a1, *b2, *a2;
1122 long n = INC_MOD(second_addr, addr_last);
1123 long p = first_addr - 1;
1124 int done = (addr == first_addr - 1 || addr == second_addr);
1125
1126 SPL1();
1127 if (done) {
1128 a2 = get_addressed_line_node(n);
1129 b2 = get_addressed_line_node(p);
1130 current_addr = second_addr;
1131 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1132 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1133 SPL0();
1134 return ERR;
1135 } else {
1136 a1 = get_addressed_line_node(n);
1137 if (addr < first_addr) {
1138 b1 = get_addressed_line_node(p);
1139 b2 = get_addressed_line_node(addr);
1140 /* this get_addressed_line_node last! */
1141 } else {
1142 b2 = get_addressed_line_node(addr);
1143 b1 = get_addressed_line_node(p);
1144 /* this get_addressed_line_node last! */
1145 }
1146 a2 = b2->q_forw;
1147 REQUE(b2, b1->q_forw);
1148 REQUE(a1->q_back, a2);
1149 REQUE(b1, a1);
1150 current_addr = addr + ((addr < first_addr) ?
1151 second_addr - first_addr + 1 : 0);
1152 }
1153 if (isglobal)
1154 unset_active_nodes(b2->q_forw, a2);
1155 modified = 1;
1156 SPL0();
1157 return 0;
1158 }
1159
1160
1161 /* copy_lines: copy a range of lines; return status */
1162 int
copy_lines(long addr)1163 copy_lines(long addr)
1164 {
1165 line_t *lp, *np = get_addressed_line_node(first_addr);
1166 undo_t *up = NULL;
1167 long n = second_addr - first_addr + 1;
1168 long m = 0;
1169
1170 current_addr = addr;
1171 if (first_addr <= addr && addr < second_addr) {
1172 n = addr - first_addr + 1;
1173 m = second_addr - addr;
1174 }
1175 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1176 for (; n-- > 0; np = np->q_forw) {
1177 SPL1();
1178 if ((lp = dup_line_node(np)) == NULL) {
1179 SPL0();
1180 return ERR;
1181 }
1182 add_line_node(lp);
1183 if (up)
1184 up->t = lp;
1185 else if ((up = push_undo_stack(UADD, current_addr,
1186 current_addr)) == NULL) {
1187 SPL0();
1188 return ERR;
1189 }
1190 modified = 1;
1191 SPL0();
1192 }
1193 return 0;
1194 }
1195
1196
1197 /* delete_lines: delete a range of lines */
1198 int
delete_lines(long from,long to)1199 delete_lines(long from, long to)
1200 {
1201 line_t *n, *p;
1202
1203 SPL1();
1204 if (push_undo_stack(UDEL, from, to) == NULL) {
1205 SPL0();
1206 return ERR;
1207 }
1208 n = get_addressed_line_node(INC_MOD(to, addr_last));
1209 p = get_addressed_line_node(from - 1);
1210 /* this get_addressed_line_node last! */
1211 if (isglobal)
1212 unset_active_nodes(p->q_forw, n);
1213 REQUE(p, n);
1214 addr_last -= to - from + 1;
1215 current_addr = from - 1;
1216 modified = 1;
1217 SPL0();
1218 return 0;
1219 }
1220
1221
1222 /* display_lines: print a range of lines to stdout */
1223 int
display_lines(long from,long to,int gflag)1224 display_lines(long from, long to, int gflag)
1225 {
1226 line_t *bp;
1227 line_t *ep;
1228 char *s;
1229
1230 if (!from) {
1231 errmsg = "invalid address";
1232 return ERR;
1233 }
1234 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1235 bp = get_addressed_line_node(from);
1236 for (; bp != ep; bp = bp->q_forw) {
1237 if ((s = get_sbuf_line(bp)) == NULL)
1238 return ERR;
1239 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1240 return ERR;
1241 }
1242 return 0;
1243 }
1244
1245
1246 #define MAXMARK 26 /* max number of marks */
1247
1248 static line_t *mark[MAXMARK]; /* line markers */
1249 static int markno; /* line marker count */
1250
1251 /* mark_line_node: set a line node mark */
1252 int
mark_line_node(line_t * lp,int n)1253 mark_line_node(line_t *lp, int n)
1254 {
1255 if (!islower((unsigned char)n)) {
1256 errmsg = "invalid mark character";
1257 return ERR;
1258 } else if (mark[n - 'a'] == NULL)
1259 markno++;
1260 mark[n - 'a'] = lp;
1261 return 0;
1262 }
1263
1264
1265 /* get_marked_node_addr: return address of a marked line */
1266 long
get_marked_node_addr(int n)1267 get_marked_node_addr(int n)
1268 {
1269 if (!islower((unsigned char)n)) {
1270 errmsg = "invalid mark character";
1271 return ERR;
1272 }
1273 return get_line_node_addr(mark[n - 'a']);
1274 }
1275
1276
1277 /* unmark_line_node: clear line node mark */
1278 void
unmark_line_node(line_t * lp)1279 unmark_line_node(line_t *lp)
1280 {
1281 int i;
1282
1283 for (i = 0; markno && i < MAXMARK; i++)
1284 if (mark[i] == lp) {
1285 mark[i] = NULL;
1286 markno--;
1287 }
1288 }
1289
1290
1291 /* dup_line_node: return a pointer to a copy of a line node */
1292 line_t *
dup_line_node(line_t * lp)1293 dup_line_node(line_t *lp)
1294 {
1295 line_t *np;
1296
1297 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1298 fprintf(stderr, "%s\n", strerror(errno));
1299 errmsg = "out of memory";
1300 return NULL;
1301 }
1302 np->seek = lp->seek;
1303 np->len = lp->len;
1304 return np;
1305 }
1306
1307
1308 /* has_trailing_escape: return the parity of escapes preceding a character
1309 in a string */
1310 int
has_trailing_escape(char * s,char * t)1311 has_trailing_escape(char *s, char *t)
1312 {
1313 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1314 }
1315
1316
1317 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1318 char *
strip_escapes(char * s)1319 strip_escapes(char *s)
1320 {
1321 static char *file = NULL;
1322 static int filesz = 0;
1323
1324 int i = 0;
1325
1326 REALLOC(file, filesz, PATH_MAX, NULL);
1327 while (i < filesz - 1 /* Worry about a possible trailing escape */
1328 && (file[i++] = (*s == '\\') ? *++s : *s))
1329 s++;
1330 return file;
1331 }
1332
1333
1334 void
signal_hup(int signo)1335 signal_hup(int signo)
1336 {
1337 if (mutex)
1338 sigflags |= (1 << (signo - 1));
1339 else
1340 handle_hup(signo);
1341 }
1342
1343
1344 void
signal_int(int signo)1345 signal_int(int signo)
1346 {
1347 if (mutex)
1348 sigflags |= (1 << (signo - 1));
1349 else
1350 handle_int(signo);
1351 }
1352
1353
1354 void
handle_hup(int signo)1355 handle_hup(int signo)
1356 {
1357 char *hup = NULL; /* hup filename */
1358 char *s;
1359 char ed_hup[] = "ed.hup";
1360 size_t n;
1361
1362 if (!sigactive)
1363 quit(1);
1364 sigflags &= ~(1 << (signo - 1));
1365 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 &&
1366 (s = getenv("HOME")) != NULL &&
1367 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */
1368 (hup = (char *) malloc(n + 10)) != NULL) {
1369 strcpy(hup, s);
1370 if (hup[n - 1] != '/')
1371 hup[n] = '/', hup[n+1] = '\0';
1372 strcat(hup, "ed.hup");
1373 write_file(hup, "w", 1, addr_last);
1374 }
1375 quit(2);
1376 }
1377
1378
1379 void
handle_int(int signo)1380 handle_int(int signo)
1381 {
1382 if (!sigactive)
1383 quit(1);
1384 sigflags &= ~(1 << (signo - 1));
1385 #ifdef _POSIX_SOURCE
1386 siglongjmp(env, -1);
1387 #else
1388 longjmp(env, -1);
1389 #endif
1390 }
1391
1392
1393 int cols = 72; /* wrap column */
1394
1395 void
handle_winch(int signo)1396 handle_winch(int signo)
1397 {
1398 int save_errno = errno;
1399
1400 struct winsize ws; /* window size structure */
1401
1402 sigflags &= ~(1 << (signo - 1));
1403 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1404 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1405 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1406 }
1407 errno = save_errno;
1408 }
1409
1410
1411 /* is_legal_filename: return a legal filename */
1412 int
is_legal_filename(char * s)1413 is_legal_filename(char *s)
1414 {
1415 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1416 errmsg = "shell access restricted";
1417 return 0;
1418 }
1419 return 1;
1420 }
1421