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