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 * @(#) Copyright (c) 1993 Andrew Moore, Talke Studio. All rights reserved.
29 * @(#)main.c,v 1.1 1994/02/01 00:34:42 alm Exp
30 * $FreeBSD: head/bin/ed/main.c 292455 2015-12-18 23:05:36Z pfg $
31 */
32
33 /*
34 * CREDITS
35 *
36 * This program is based on the editor algorithm described in
37 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
38 * in Pascal," Addison-Wesley, 1981.
39 *
40 * The buffering algorithm is attributed to Rodney Ruddock of
41 * the University of Guelph, Guelph, Ontario.
42 *
43 * The cbc.c encryption code is adapted from
44 * the bdes program by Matt Bishop of Dartmouth College,
45 * Hanover, NH.
46 *
47 */
48
49 #include <sys/types.h>
50
51 #include <sys/ioctl.h>
52 #include <sys/wait.h>
53 #include <ctype.h>
54 #include <locale.h>
55 #include <pwd.h>
56 #include <setjmp.h>
57
58 #include "ed.h"
59
60
61 static sigjmp_buf env;
62
63 /* static buffers */
64 char stdinbuf[1]; /* stdin buffer */
65 static char *shcmd; /* shell command buffer */
66 static int shcmdsz; /* shell command buffer size */
67 static int shcmdi; /* shell command buffer index */
68 char *ibuf; /* ed command-line buffer */
69 int ibufsz; /* ed command-line buffer size */
70 char *ibufp; /* pointer to ed command-line buffer */
71
72 /* global flags */
73 int des = 0; /* if set, use crypt(3) for i/o */
74 static int garrulous = 0; /* if set, print all error messages */
75 int isbinary; /* if set, buffer contains ASCII NULs */
76 int isglobal; /* if set, doing a global command */
77 int modified; /* if set, buffer modified since last write */
78 int mutex = 0; /* if set, signals set "sigflags" */
79 static int red = 0; /* if set, restrict shell/directory access */
80 int scripted = 0; /* if set, suppress diagnostics */
81 int sigflags = 0; /* if set, signals received while mutex set */
82 static int sigactive = 0; /* if set, signal handlers are enabled */
83
84 static char old_filename[PATH_MAX] = ""; /* default filename */
85 long current_addr; /* current address in editor buffer */
86 long addr_last; /* last address in editor buffer */
87 int lineno; /* script line number */
88 static const char *prompt; /* command-line prompt */
89 static const char *dps = "*"; /* default command-line prompt */
90
91 static const char *usage = "usage: %s [-] [-sx] [-p string] [file]\n";
92
93 /* ed: line editor */
94 int
main(volatile int argc,char ** volatile argv)95 main(volatile int argc, char ** volatile argv)
96 {
97 int c, n;
98 long status = 0;
99
100 setlocale(LC_ALL, "");
101
102 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
103 top:
104 while ((c = getopt(argc, argv, "p:sx")) != -1)
105 switch(c) {
106 case 'p': /* set prompt */
107 prompt = optarg;
108 break;
109 case 's': /* run script */
110 scripted = 1;
111 break;
112 case 'x': /* use crypt */
113 #ifdef DES
114 des = get_keyword();
115 #else
116 fprintf(stderr, "crypt unavailable\n?\n");
117 #endif
118 break;
119
120 default:
121 fprintf(stderr, usage, red ? "red" : "ed");
122 exit(1);
123 }
124 argv += optind;
125 argc -= optind;
126 if (argc && **argv == '-') {
127 scripted = 1;
128 if (argc > 1) {
129 optind = 1;
130 goto top;
131 }
132 argv++;
133 argc--;
134 }
135 /* assert: reliable signals! */
136 #ifdef SIGWINCH
137 handle_winch(SIGWINCH);
138 if (isatty(0)) signal(SIGWINCH, handle_winch);
139 #endif
140 signal(SIGHUP, signal_hup);
141 signal(SIGQUIT, SIG_IGN);
142 signal(SIGINT, signal_int);
143 if ((status = sigsetjmp(env, 1))) {
144 fputs("\n?\n", stderr);
145 errmsg = "interrupt";
146 } else {
147 init_buffers();
148 sigactive = 1; /* enable signal handlers */
149 if (argc && **argv && is_legal_filename(*argv)) {
150 if (read_file(*argv, 0) < 0 && !isatty(0))
151 quit(2);
152 else if (**argv != '!')
153 if (strlcpy(old_filename, *argv, sizeof(old_filename))
154 >= sizeof(old_filename))
155 quit(2);
156 } else if (argc) {
157 fputs("?\n", stderr);
158 if (**argv == '\0')
159 errmsg = "invalid filename";
160 if (!isatty(0))
161 quit(2);
162 }
163 }
164 for (;;) {
165 if (status < 0 && garrulous)
166 fprintf(stderr, "%s\n", errmsg);
167 if (prompt) {
168 printf("%s", prompt);
169 fflush(stdout);
170 }
171 if ((n = get_tty_line()) < 0) {
172 status = ERR;
173 continue;
174 } else if (n == 0) {
175 if (modified && !scripted) {
176 fputs("?\n", stderr);
177 errmsg = "warning: file modified";
178 if (!isatty(0)) {
179 if (garrulous)
180 fprintf(stderr,
181 "script, line %d: %s\n",
182 lineno, errmsg);
183 quit(2);
184 }
185 clearerr(stdin);
186 modified = 0;
187 status = EMOD;
188 continue;
189 } else
190 quit(0);
191 } else if (ibuf[n - 1] != '\n') {
192 /* discard line */
193 errmsg = "unexpected end-of-file";
194 clearerr(stdin);
195 status = ERR;
196 continue;
197 }
198 isglobal = 0;
199 if ((status = extract_addr_range()) >= 0 &&
200 (status = exec_command()) >= 0)
201 if (!status ||
202 (status = display_lines(current_addr, current_addr,
203 status)) >= 0)
204 continue;
205 switch (status) {
206 case EOF:
207 quit(0);
208 case EMOD:
209 modified = 0;
210 fputs("?\n", stderr); /* give warning */
211 errmsg = "warning: file modified";
212 if (!isatty(0)) {
213 if (garrulous)
214 fprintf(stderr, "script, line %d: %s\n",
215 lineno, errmsg);
216 quit(2);
217 }
218 break;
219 case FATAL:
220 if (!isatty(0)) {
221 if (garrulous)
222 fprintf(stderr, "script, line %d: %s\n",
223 lineno, errmsg);
224 } else if (garrulous)
225 fprintf(stderr, "%s\n", errmsg);
226 quit(3);
227 default:
228 fputs("?\n", stderr);
229 if (!isatty(0)) {
230 if (garrulous)
231 fprintf(stderr, "script, line %d: %s\n",
232 lineno, errmsg);
233 quit(2);
234 }
235 break;
236 }
237 }
238 /*NOTREACHED*/
239 }
240
241 long first_addr, second_addr;
242 static long addr_cnt;
243
244 /* extract_addr_range: get line addresses from the command buffer until an
245 illegal address is seen; return status */
246 int
extract_addr_range(void)247 extract_addr_range(void)
248 {
249 long addr;
250
251 addr_cnt = 0;
252 first_addr = second_addr = current_addr;
253 while ((addr = next_addr()) >= 0) {
254 addr_cnt++;
255 first_addr = second_addr;
256 second_addr = addr;
257 if (*ibufp != ',' && *ibufp != ';')
258 break;
259 else if (*ibufp++ == ';')
260 current_addr = addr;
261 }
262 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
263 first_addr = second_addr;
264 return (addr == ERR) ? ERR : 0;
265 }
266
267
268 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
269
270 #define MUST_BE_FIRST() do { \
271 if (!first) { \
272 errmsg = "invalid address"; \
273 return ERR; \
274 } \
275 } while (0)
276
277 /* next_addr: return the next line address in the command buffer */
278 long
next_addr(void)279 next_addr(void)
280 {
281 const char *hd;
282 long addr = current_addr;
283 long n;
284 int first = 1;
285 int c;
286
287 SKIP_BLANKS();
288 for (hd = ibufp;; first = 0)
289 switch (c = *ibufp) {
290 case '+':
291 case '\t':
292 case ' ':
293 case '-':
294 case '^':
295 ibufp++;
296 SKIP_BLANKS();
297 if (isdigit((unsigned char)*ibufp)) {
298 STRTOL(n, ibufp);
299 addr += (c == '-' || c == '^') ? -n : n;
300 } else if (!isspace((unsigned char)c))
301 addr += (c == '-' || c == '^') ? -1 : 1;
302 break;
303 case '0': case '1': case '2':
304 case '3': case '4': case '5':
305 case '6': case '7': case '8': case '9':
306 MUST_BE_FIRST();
307 STRTOL(addr, ibufp);
308 break;
309 case '.':
310 case '$':
311 MUST_BE_FIRST();
312 ibufp++;
313 addr = (c == '.') ? current_addr : addr_last;
314 break;
315 case '/':
316 case '?':
317 MUST_BE_FIRST();
318 if ((addr = get_matching_node_addr(
319 get_compiled_pattern(), c == '/')) < 0)
320 return ERR;
321 else if (c == *ibufp)
322 ibufp++;
323 break;
324 case '\'':
325 MUST_BE_FIRST();
326 ibufp++;
327 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
328 return ERR;
329 break;
330 case '%':
331 case ',':
332 case ';':
333 if (first) {
334 ibufp++;
335 addr_cnt++;
336 second_addr = (c == ';') ? current_addr : 1;
337 addr = addr_last;
338 break;
339 }
340 /* FALLTHROUGH */
341 default:
342 if (ibufp == hd)
343 return EOF;
344 else if (addr < 0 || addr_last < addr) {
345 errmsg = "invalid address";
346 return ERR;
347 } else
348 return addr;
349 }
350 /* NOTREACHED */
351 }
352
353
354 #ifdef BACKWARDS
355 /* GET_THIRD_ADDR: get a legal address from the command buffer */
356 #define GET_THIRD_ADDR(addr) \
357 { \
358 long ol1, ol2; \
359 \
360 ol1 = first_addr, ol2 = second_addr; \
361 if (extract_addr_range() < 0) \
362 return ERR; \
363 else if (addr_cnt == 0) { \
364 errmsg = "destination expected"; \
365 return ERR; \
366 } else if (second_addr < 0 || addr_last < second_addr) { \
367 errmsg = "invalid address"; \
368 return ERR; \
369 } \
370 addr = second_addr; \
371 first_addr = ol1, second_addr = ol2; \
372 }
373 #else /* BACKWARDS */
374 /* GET_THIRD_ADDR: get a legal address from the command buffer */
375 #define GET_THIRD_ADDR(addr) \
376 { \
377 long ol1, ol2; \
378 \
379 ol1 = first_addr, ol2 = second_addr; \
380 if (extract_addr_range() < 0) \
381 return ERR; \
382 if (second_addr < 0 || addr_last < second_addr) { \
383 errmsg = "invalid address"; \
384 return ERR; \
385 } \
386 addr = second_addr; \
387 first_addr = ol1, second_addr = ol2; \
388 }
389 #endif
390
391
392 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
393 #define GET_COMMAND_SUFFIX() { \
394 int done = 0; \
395 do { \
396 switch(*ibufp) { \
397 case 'p': \
398 gflag |= GPR, ibufp++; \
399 break; \
400 case 'l': \
401 gflag |= GLS, ibufp++; \
402 break; \
403 case 'n': \
404 gflag |= GNP, ibufp++; \
405 break; \
406 default: \
407 done++; \
408 } \
409 } while (!done); \
410 if (*ibufp++ != '\n') { \
411 errmsg = "invalid command suffix"; \
412 return ERR; \
413 } \
414 }
415
416
417 /* sflags */
418 #define SGG 001 /* complement previous global substitute suffix */
419 #define SGP 002 /* complement previous print suffix */
420 #define SGR 004 /* use last regex instead of last pat */
421 #define SGF 010 /* repeat last substitution */
422
423 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
424
425 long rows = 22; /* scroll length: ws_row - 2 */
426
427 /* exec_command: execute the next command in command buffer; return print
428 request, if any */
429 int
exec_command(void)430 exec_command(void)
431 {
432 static pattern_t *pat = NULL;
433 static int sgflag = 0;
434 static long sgnum = 0;
435
436 pattern_t *tpat;
437 char *fnp;
438 int gflag = 0;
439 int sflags = 0;
440 long addr = 0;
441 int n = 0;
442 int c;
443
444 SKIP_BLANKS();
445 switch(c = *ibufp++) {
446 case 'a':
447 GET_COMMAND_SUFFIX();
448 if (!isglobal) clear_undo_stack();
449 if (append_lines(second_addr) < 0)
450 return ERR;
451 break;
452 case 'c':
453 if (check_addr_range(current_addr, current_addr) < 0)
454 return ERR;
455 GET_COMMAND_SUFFIX();
456 if (!isglobal) clear_undo_stack();
457 if (delete_lines(first_addr, second_addr) < 0 ||
458 append_lines(current_addr) < 0)
459 return ERR;
460 break;
461 case 'd':
462 if (check_addr_range(current_addr, current_addr) < 0)
463 return ERR;
464 GET_COMMAND_SUFFIX();
465 if (!isglobal) clear_undo_stack();
466 if (delete_lines(first_addr, second_addr) < 0)
467 return ERR;
468 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
469 current_addr = addr;
470 break;
471 case 'e':
472 if (modified && !scripted)
473 return EMOD;
474 /* FALLTHROUGH */
475 case 'E':
476 if (addr_cnt > 0) {
477 errmsg = "unexpected address";
478 return ERR;
479 } else if (!isspace((unsigned char)*ibufp)) {
480 errmsg = "unexpected command suffix";
481 return ERR;
482 } else if ((fnp = get_filename()) == NULL)
483 return ERR;
484 GET_COMMAND_SUFFIX();
485 if (delete_lines(1, addr_last) < 0)
486 return ERR;
487 clear_undo_stack();
488 if (close_sbuf() < 0)
489 return ERR;
490 else if (open_sbuf() < 0)
491 return FATAL;
492 if (*fnp && *fnp != '!')
493 strlcpy(old_filename, fnp, PATH_MAX);
494 #ifdef BACKWARDS
495 if (*fnp == '\0' && *old_filename == '\0') {
496 errmsg = "no current filename";
497 return ERR;
498 }
499 #endif
500 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
501 return ERR;
502 clear_undo_stack();
503 modified = 0;
504 u_current_addr = u_addr_last = -1;
505 break;
506 case 'f':
507 if (addr_cnt > 0) {
508 errmsg = "unexpected address";
509 return ERR;
510 } else if (!isspace((unsigned char)*ibufp)) {
511 errmsg = "unexpected command suffix";
512 return ERR;
513 } else if ((fnp = get_filename()) == NULL)
514 return ERR;
515 else if (*fnp == '!') {
516 errmsg = "invalid redirection";
517 return ERR;
518 }
519 GET_COMMAND_SUFFIX();
520 if (*fnp)
521 strlcpy(old_filename, fnp, PATH_MAX);
522 printf("%s\n", strip_escapes(old_filename));
523 break;
524 case 'g':
525 case 'v':
526 case 'G':
527 case 'V':
528 if (isglobal) {
529 errmsg = "cannot nest global commands";
530 return ERR;
531 } else if (check_addr_range(1, addr_last) < 0)
532 return ERR;
533 else if (build_active_list(c == 'g' || c == 'G') < 0)
534 return ERR;
535 else if ((n = (c == 'G' || c == 'V')))
536 GET_COMMAND_SUFFIX();
537 isglobal++;
538 if (exec_global(n, gflag) < 0)
539 return ERR;
540 break;
541 case 'h':
542 if (addr_cnt > 0) {
543 errmsg = "unexpected address";
544 return ERR;
545 }
546 GET_COMMAND_SUFFIX();
547 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
548 break;
549 case 'H':
550 if (addr_cnt > 0) {
551 errmsg = "unexpected address";
552 return ERR;
553 }
554 GET_COMMAND_SUFFIX();
555 if ((garrulous = 1 - garrulous) && *errmsg)
556 fprintf(stderr, "%s\n", errmsg);
557 break;
558 case 'i':
559 if (second_addr == 0) {
560 errmsg = "invalid address";
561 return ERR;
562 }
563 GET_COMMAND_SUFFIX();
564 if (!isglobal) clear_undo_stack();
565 if (append_lines(second_addr - 1) < 0)
566 return ERR;
567 break;
568 case 'j':
569 if (check_addr_range(current_addr, current_addr + 1) < 0)
570 return ERR;
571 GET_COMMAND_SUFFIX();
572 if (!isglobal) clear_undo_stack();
573 if (first_addr != second_addr &&
574 join_lines(first_addr, second_addr) < 0)
575 return ERR;
576 break;
577 case 'k':
578 c = *ibufp++;
579 if (second_addr == 0) {
580 errmsg = "invalid address";
581 return ERR;
582 }
583 GET_COMMAND_SUFFIX();
584 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
585 return ERR;
586 break;
587 case 'l':
588 if (check_addr_range(current_addr, current_addr) < 0)
589 return ERR;
590 GET_COMMAND_SUFFIX();
591 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
592 return ERR;
593 gflag = 0;
594 break;
595 case 'm':
596 if (check_addr_range(current_addr, current_addr) < 0)
597 return ERR;
598 GET_THIRD_ADDR(addr);
599 if (first_addr <= addr && addr < second_addr) {
600 errmsg = "invalid destination";
601 return ERR;
602 }
603 GET_COMMAND_SUFFIX();
604 if (!isglobal) clear_undo_stack();
605 if (move_lines(addr) < 0)
606 return ERR;
607 break;
608 case 'n':
609 if (check_addr_range(current_addr, current_addr) < 0)
610 return ERR;
611 GET_COMMAND_SUFFIX();
612 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
613 return ERR;
614 gflag = 0;
615 break;
616 case 'p':
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 | GPR) < 0)
621 return ERR;
622 gflag = 0;
623 break;
624 case 'P':
625 if (addr_cnt > 0) {
626 errmsg = "unexpected address";
627 return ERR;
628 }
629 GET_COMMAND_SUFFIX();
630 prompt = prompt ? NULL : optarg ? optarg : dps;
631 break;
632 case 'q':
633 case 'Q':
634 if (addr_cnt > 0) {
635 errmsg = "unexpected address";
636 return ERR;
637 }
638 GET_COMMAND_SUFFIX();
639 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
640 break;
641 case 'r':
642 if (!isspace((unsigned char)*ibufp)) {
643 errmsg = "unexpected command suffix";
644 return ERR;
645 } else if (addr_cnt == 0)
646 second_addr = addr_last;
647 if ((fnp = get_filename()) == NULL)
648 return ERR;
649 GET_COMMAND_SUFFIX();
650 if (!isglobal) clear_undo_stack();
651 if (*old_filename == '\0' && *fnp != '!')
652 strlcpy(old_filename, fnp, PATH_MAX);
653 #ifdef BACKWARDS
654 if (*fnp == '\0' && *old_filename == '\0') {
655 errmsg = "no current filename";
656 return ERR;
657 }
658 #endif
659 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
660 return ERR;
661 else if (addr && addr != addr_last)
662 modified = 1;
663 break;
664 case 's':
665 do {
666 switch(*ibufp) {
667 case '\n':
668 sflags |=SGF;
669 break;
670 case 'g':
671 sflags |= SGG;
672 ibufp++;
673 break;
674 case 'p':
675 sflags |= SGP;
676 ibufp++;
677 break;
678 case 'r':
679 sflags |= SGR;
680 ibufp++;
681 break;
682 case '0': case '1': case '2': case '3': case '4':
683 case '5': case '6': case '7': case '8': case '9':
684 STRTOL(sgnum, ibufp);
685 sflags |= SGF;
686 sgflag &= ~GSG; /* override GSG */
687 break;
688 default:
689 if (sflags) {
690 errmsg = "invalid command suffix";
691 return ERR;
692 }
693 }
694 } while (sflags && *ibufp != '\n');
695 if (sflags && !pat) {
696 errmsg = "no previous substitution";
697 return ERR;
698 } else if (sflags & SGG)
699 sgnum = 0; /* override numeric arg */
700 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
701 errmsg = "invalid pattern delimiter";
702 return ERR;
703 }
704 tpat = pat;
705 SPL1();
706 if ((!sflags || (sflags & SGR)) &&
707 (tpat = get_compiled_pattern()) == NULL) {
708 SPL0();
709 return ERR;
710 } else if (tpat != pat) {
711 if (pat) {
712 regfree(pat);
713 free(pat);
714 }
715 pat = tpat;
716 patlock = 1; /* reserve pattern */
717 }
718 SPL0();
719 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
720 return ERR;
721 else if (isglobal)
722 sgflag |= GLB;
723 else
724 sgflag &= ~GLB;
725 if (sflags & SGG)
726 sgflag ^= GSG;
727 if (sflags & SGP)
728 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
729 do {
730 switch(*ibufp) {
731 case 'p':
732 sgflag |= GPR, ibufp++;
733 break;
734 case 'l':
735 sgflag |= GLS, ibufp++;
736 break;
737 case 'n':
738 sgflag |= GNP, ibufp++;
739 break;
740 default:
741 n++;
742 }
743 } while (!n);
744 if (check_addr_range(current_addr, current_addr) < 0)
745 return ERR;
746 GET_COMMAND_SUFFIX();
747 if (!isglobal) clear_undo_stack();
748 if (search_and_replace(pat, sgflag, sgnum) < 0)
749 return ERR;
750 break;
751 case 't':
752 if (check_addr_range(current_addr, current_addr) < 0)
753 return ERR;
754 GET_THIRD_ADDR(addr);
755 GET_COMMAND_SUFFIX();
756 if (!isglobal) clear_undo_stack();
757 if (copy_lines(addr) < 0)
758 return ERR;
759 break;
760 case 'u':
761 if (addr_cnt > 0) {
762 errmsg = "unexpected address";
763 return ERR;
764 }
765 GET_COMMAND_SUFFIX();
766 if (pop_undo_stack() < 0)
767 return ERR;
768 break;
769 case 'w':
770 case 'W':
771 if ((n = *ibufp) == 'q' || n == 'Q') {
772 gflag = EOF;
773 ibufp++;
774 }
775 if (!isspace((unsigned char)*ibufp)) {
776 errmsg = "unexpected command suffix";
777 return ERR;
778 } else if ((fnp = get_filename()) == NULL)
779 return ERR;
780 if (addr_cnt == 0 && !addr_last)
781 first_addr = second_addr = 0;
782 else if (check_addr_range(1, addr_last) < 0)
783 return ERR;
784 GET_COMMAND_SUFFIX();
785 if (*old_filename == '\0' && *fnp != '!')
786 strlcpy(old_filename, fnp, PATH_MAX);
787 #ifdef BACKWARDS
788 if (*fnp == '\0' && *old_filename == '\0') {
789 errmsg = "no current filename";
790 return ERR;
791 }
792 #endif
793 if ((addr = write_file(*fnp ? fnp : old_filename,
794 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
795 return ERR;
796 else if (addr == addr_last)
797 modified = 0;
798 else if (modified && !scripted && n == 'q')
799 gflag = EMOD;
800 break;
801 case 'x':
802 if (addr_cnt > 0) {
803 errmsg = "unexpected address";
804 return ERR;
805 }
806 GET_COMMAND_SUFFIX();
807 #ifdef DES
808 des = get_keyword();
809 break;
810 #else
811 errmsg = "crypt unavailable";
812 return ERR;
813 #endif
814 case 'z':
815 #ifdef BACKWARDS
816 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
817 #else
818 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
819 #endif
820 return ERR;
821 else if ('0' < *ibufp && *ibufp <= '9')
822 STRTOL(rows, ibufp);
823 GET_COMMAND_SUFFIX();
824 if (display_lines(second_addr, min(addr_last,
825 second_addr + rows), gflag) < 0)
826 return ERR;
827 gflag = 0;
828 break;
829 case '=':
830 GET_COMMAND_SUFFIX();
831 printf("%ld\n", addr_cnt ? second_addr : addr_last);
832 break;
833 case '!':
834 if (addr_cnt > 0) {
835 errmsg = "unexpected address";
836 return ERR;
837 } else if ((sflags = get_shell_command()) < 0)
838 return ERR;
839 GET_COMMAND_SUFFIX();
840 if (sflags) printf("%s\n", shcmd + 1);
841 system(shcmd + 1);
842 if (!scripted) printf("!\n");
843 break;
844 case '\n':
845 #ifdef BACKWARDS
846 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
847 #else
848 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
849 #endif
850 || display_lines(second_addr, second_addr, 0) < 0)
851 return ERR;
852 break;
853 default:
854 errmsg = "unknown command";
855 return ERR;
856 }
857 return gflag;
858 }
859
860
861 /* check_addr_range: return status of address range check */
862 int
check_addr_range(long n,long m)863 check_addr_range(long n, long m)
864 {
865 if (addr_cnt == 0) {
866 first_addr = n;
867 second_addr = m;
868 }
869 if (first_addr > second_addr || 1 > first_addr ||
870 second_addr > addr_last) {
871 errmsg = "invalid address";
872 return ERR;
873 }
874 return 0;
875 }
876
877
878 /* get_matching_node_addr: return the address of the next line matching a
879 pattern in a given direction. wrap around begin/end of editor buffer if
880 necessary */
881 long
get_matching_node_addr(pattern_t * pat,int dir)882 get_matching_node_addr(pattern_t *pat, int dir)
883 {
884 char *s;
885 long n = current_addr;
886 line_t *lp;
887
888 if (!pat) return ERR;
889 do {
890 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
891 lp = get_addressed_line_node(n);
892 if ((s = get_sbuf_line(lp)) == NULL)
893 return ERR;
894 if (isbinary)
895 NUL_TO_NEWLINE(s, lp->len);
896 if (!regexec(pat, s, 0, NULL, 0))
897 return n;
898 }
899 } while (n != current_addr);
900 errmsg = "no match";
901 return ERR;
902 }
903
904
905 /* get_filename: return pointer to copy of filename in the command buffer */
906 char *
get_filename(void)907 get_filename(void)
908 {
909 static char *file = NULL;
910 static int filesz = 0;
911
912 int n;
913
914 if (*ibufp != '\n') {
915 SKIP_BLANKS();
916 if (*ibufp == '\n') {
917 errmsg = "invalid filename";
918 return NULL;
919 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
920 return NULL;
921 else if (*ibufp == '!') {
922 ibufp++;
923 if ((n = get_shell_command()) < 0)
924 return NULL;
925 if (n)
926 printf("%s\n", shcmd + 1);
927 return shcmd;
928 } else if (n > PATH_MAX - 1) {
929 errmsg = "filename too long";
930 return NULL;
931 }
932 }
933 #ifndef BACKWARDS
934 else if (*old_filename == '\0') {
935 errmsg = "no current filename";
936 return NULL;
937 }
938 #endif
939 REALLOC(file, filesz, PATH_MAX, NULL);
940 for (n = 0; *ibufp != '\n';)
941 file[n++] = *ibufp++;
942 file[n] = '\0';
943 return is_legal_filename(file) ? file : NULL;
944 }
945
946
947 /* get_shell_command: read a shell command from stdin; return substitution
948 status */
949 int
get_shell_command(void)950 get_shell_command(void)
951 {
952 static char *buf = NULL;
953 static int n = 0;
954
955 char *s; /* substitution char pointer */
956 int i = 0;
957 int j = 0;
958
959 if (red) {
960 errmsg = "shell access restricted";
961 return ERR;
962 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
963 return ERR;
964 REALLOC(buf, n, j + 1, ERR);
965 buf[i++] = '!'; /* prefix command w/ bang */
966 while (*ibufp != '\n')
967 switch (*ibufp) {
968 default:
969 REALLOC(buf, n, i + 2, ERR);
970 buf[i++] = *ibufp;
971 if (*ibufp++ == '\\')
972 buf[i++] = *ibufp++;
973 break;
974 case '!':
975 if (s != ibufp) {
976 REALLOC(buf, n, i + 1, ERR);
977 buf[i++] = *ibufp++;
978 }
979 #ifdef BACKWARDS
980 else if (shcmd == NULL || *(shcmd + 1) == '\0')
981 #else
982 else if (shcmd == NULL)
983 #endif
984 {
985 errmsg = "no previous command";
986 return ERR;
987 } else {
988 REALLOC(buf, n, i + shcmdi, ERR);
989 for (s = shcmd + 1; s < shcmd + shcmdi;)
990 buf[i++] = *s++;
991 s = ibufp++;
992 }
993 break;
994 case '%':
995 if (*old_filename == '\0') {
996 errmsg = "no current filename";
997 return ERR;
998 }
999 j = strlen(s = strip_escapes(old_filename));
1000 REALLOC(buf, n, i + j, ERR);
1001 while (j--)
1002 buf[i++] = *s++;
1003 s = ibufp++;
1004 break;
1005 }
1006 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1007 memcpy(shcmd, buf, i);
1008 shcmd[shcmdi = i] = '\0';
1009 return *s == '!' || *s == '%';
1010 }
1011
1012
1013 /* append_lines: insert text from stdin to after line n; stop when either a
1014 single period is read or EOF; return status */
1015 int
append_lines(long n)1016 append_lines(long n)
1017 {
1018 int l;
1019 const char *lp = ibuf;
1020 const char *eot;
1021 undo_t *up = NULL;
1022
1023 for (current_addr = n;;) {
1024 if (!isglobal) {
1025 if ((l = get_tty_line()) < 0)
1026 return ERR;
1027 else if (l == 0 || ibuf[l - 1] != '\n') {
1028 clearerr(stdin);
1029 return l ? EOF : 0;
1030 }
1031 lp = ibuf;
1032 } else if (*(lp = ibufp) == '\0')
1033 return 0;
1034 else {
1035 while (*ibufp++ != '\n')
1036 ;
1037 l = ibufp - lp;
1038 }
1039 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1040 return 0;
1041 }
1042 eot = lp + l;
1043 SPL1();
1044 do {
1045 if ((lp = put_sbuf_line(lp)) == NULL) {
1046 SPL0();
1047 return ERR;
1048 } else if (up)
1049 up->t = get_addressed_line_node(current_addr);
1050 else if ((up = push_undo_stack(UADD, current_addr,
1051 current_addr)) == NULL) {
1052 SPL0();
1053 return ERR;
1054 }
1055 } while (lp != eot);
1056 modified = 1;
1057 SPL0();
1058 }
1059 /* NOTREACHED */
1060 }
1061
1062
1063 /* join_lines: replace a range of lines with the joined text of those lines */
1064 int
join_lines(long from,long to)1065 join_lines(long from, long to)
1066 {
1067 static char *buf = NULL;
1068 static int n;
1069
1070 char *s;
1071 int size = 0;
1072 line_t *bp, *ep;
1073
1074 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1075 bp = get_addressed_line_node(from);
1076 for (; bp != ep; bp = bp->q_forw) {
1077 if ((s = get_sbuf_line(bp)) == NULL)
1078 return ERR;
1079 REALLOC(buf, n, size + bp->len, ERR);
1080 memcpy(buf + size, s, bp->len);
1081 size += bp->len;
1082 }
1083 REALLOC(buf, n, size + 2, ERR);
1084 memcpy(buf + size, "\n", 2);
1085 if (delete_lines(from, to) < 0)
1086 return ERR;
1087 current_addr = from - 1;
1088 SPL1();
1089 if (put_sbuf_line(buf) == NULL ||
1090 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1091 SPL0();
1092 return ERR;
1093 }
1094 modified = 1;
1095 SPL0();
1096 return 0;
1097 }
1098
1099
1100 /* move_lines: move a range of lines */
1101 int
move_lines(long addr)1102 move_lines(long addr)
1103 {
1104 line_t *b1, *a1, *b2, *a2;
1105 long n = INC_MOD(second_addr, addr_last);
1106 long p = first_addr - 1;
1107 int done = (addr == first_addr - 1 || addr == second_addr);
1108
1109 SPL1();
1110 if (done) {
1111 a2 = get_addressed_line_node(n);
1112 b2 = get_addressed_line_node(p);
1113 current_addr = second_addr;
1114 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1115 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1116 SPL0();
1117 return ERR;
1118 } else {
1119 a1 = get_addressed_line_node(n);
1120 if (addr < first_addr) {
1121 b1 = get_addressed_line_node(p);
1122 b2 = get_addressed_line_node(addr);
1123 /* this get_addressed_line_node last! */
1124 } else {
1125 b2 = get_addressed_line_node(addr);
1126 b1 = get_addressed_line_node(p);
1127 /* this get_addressed_line_node last! */
1128 }
1129 a2 = b2->q_forw;
1130 REQUE(b2, b1->q_forw);
1131 REQUE(a1->q_back, a2);
1132 REQUE(b1, a1);
1133 current_addr = addr + ((addr < first_addr) ?
1134 second_addr - first_addr + 1 : 0);
1135 }
1136 if (isglobal)
1137 unset_active_nodes(b2->q_forw, a2);
1138 modified = 1;
1139 SPL0();
1140 return 0;
1141 }
1142
1143
1144 /* copy_lines: copy a range of lines; return status */
1145 int
copy_lines(long addr)1146 copy_lines(long addr)
1147 {
1148 line_t *lp, *np = get_addressed_line_node(first_addr);
1149 undo_t *up = NULL;
1150 long n = second_addr - first_addr + 1;
1151 long m = 0;
1152
1153 current_addr = addr;
1154 if (first_addr <= addr && addr < second_addr) {
1155 n = addr - first_addr + 1;
1156 m = second_addr - addr;
1157 }
1158 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1159 for (; n-- > 0; np = np->q_forw) {
1160 SPL1();
1161 if ((lp = dup_line_node(np)) == NULL) {
1162 SPL0();
1163 return ERR;
1164 }
1165 add_line_node(lp);
1166 if (up)
1167 up->t = lp;
1168 else if ((up = push_undo_stack(UADD, current_addr,
1169 current_addr)) == NULL) {
1170 SPL0();
1171 return ERR;
1172 }
1173 modified = 1;
1174 SPL0();
1175 }
1176 return 0;
1177 }
1178
1179
1180 /* delete_lines: delete a range of lines */
1181 int
delete_lines(long from,long to)1182 delete_lines(long from, long to)
1183 {
1184 line_t *n, *p;
1185
1186 SPL1();
1187 if (push_undo_stack(UDEL, from, to) == NULL) {
1188 SPL0();
1189 return ERR;
1190 }
1191 n = get_addressed_line_node(INC_MOD(to, addr_last));
1192 p = get_addressed_line_node(from - 1);
1193 /* this get_addressed_line_node last! */
1194 if (isglobal)
1195 unset_active_nodes(p->q_forw, n);
1196 REQUE(p, n);
1197 addr_last -= to - from + 1;
1198 current_addr = from - 1;
1199 modified = 1;
1200 SPL0();
1201 return 0;
1202 }
1203
1204
1205 /* display_lines: print a range of lines to stdout */
1206 int
display_lines(long from,long to,int gflag)1207 display_lines(long from, long to, int gflag)
1208 {
1209 line_t *bp;
1210 line_t *ep;
1211 char *s;
1212
1213 if (!from) {
1214 errmsg = "invalid address";
1215 return ERR;
1216 }
1217 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1218 bp = get_addressed_line_node(from);
1219 for (; bp != ep; bp = bp->q_forw) {
1220 if ((s = get_sbuf_line(bp)) == NULL)
1221 return ERR;
1222 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1223 return ERR;
1224 }
1225 return 0;
1226 }
1227
1228
1229 #define MAXMARK 26 /* max number of marks */
1230
1231 static line_t *mark[MAXMARK]; /* line markers */
1232 static int markno; /* line marker count */
1233
1234 /* mark_line_node: set a line node mark */
1235 int
mark_line_node(line_t * lp,int n)1236 mark_line_node(line_t *lp, int n)
1237 {
1238 if (!islower((unsigned char)n)) {
1239 errmsg = "invalid mark character";
1240 return ERR;
1241 } else if (mark[n - 'a'] == NULL)
1242 markno++;
1243 mark[n - 'a'] = lp;
1244 return 0;
1245 }
1246
1247
1248 /* get_marked_node_addr: return address of a marked line */
1249 long
get_marked_node_addr(int n)1250 get_marked_node_addr(int n)
1251 {
1252 if (!islower((unsigned char)n)) {
1253 errmsg = "invalid mark character";
1254 return ERR;
1255 }
1256 return get_line_node_addr(mark[n - 'a']);
1257 }
1258
1259
1260 /* unmark_line_node: clear line node mark */
1261 void
unmark_line_node(line_t * lp)1262 unmark_line_node(line_t *lp)
1263 {
1264 int i;
1265
1266 for (i = 0; markno && i < MAXMARK; i++)
1267 if (mark[i] == lp) {
1268 mark[i] = NULL;
1269 markno--;
1270 }
1271 }
1272
1273
1274 /* dup_line_node: return a pointer to a copy of a line node */
1275 line_t *
dup_line_node(line_t * lp)1276 dup_line_node(line_t *lp)
1277 {
1278 line_t *np;
1279
1280 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1281 fprintf(stderr, "%s\n", strerror(errno));
1282 errmsg = "out of memory";
1283 return NULL;
1284 }
1285 np->seek = lp->seek;
1286 np->len = lp->len;
1287 return np;
1288 }
1289
1290
1291 /* has_trailing_escape: return the parity of escapes preceding a character
1292 in a string */
1293 int
has_trailing_escape(char * s,char * t)1294 has_trailing_escape(char *s, char *t)
1295 {
1296 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1297 }
1298
1299
1300 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1301 char *
strip_escapes(char * s)1302 strip_escapes(char *s)
1303 {
1304 static char *file = NULL;
1305 static int filesz = 0;
1306
1307 int i = 0;
1308
1309 REALLOC(file, filesz, PATH_MAX, NULL);
1310 while (i < filesz - 1 /* Worry about a possible trailing escape */
1311 && (file[i++] = (*s == '\\') ? *++s : *s))
1312 s++;
1313 return file;
1314 }
1315
1316
1317 void
signal_hup(int signo)1318 signal_hup(int signo)
1319 {
1320 if (mutex)
1321 sigflags |= (1 << (signo - 1));
1322 else
1323 handle_hup(signo);
1324 }
1325
1326
1327 void
signal_int(int signo)1328 signal_int(int signo)
1329 {
1330 if (mutex)
1331 sigflags |= (1 << (signo - 1));
1332 else
1333 handle_int(signo);
1334 }
1335
1336
1337 void
handle_hup(int signo)1338 handle_hup(int signo)
1339 {
1340 char *hup = NULL; /* hup filename */
1341 char *s;
1342 char ed_hup[] = "ed.hup";
1343 int n;
1344
1345 if (!sigactive)
1346 quit(1);
1347 sigflags &= ~(1 << (signo - 1));
1348 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 &&
1349 (s = getenv("HOME")) != NULL &&
1350 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */
1351 (hup = (char *) malloc(n + 10)) != NULL) {
1352 strcpy(hup, s);
1353 if (hup[n - 1] != '/')
1354 hup[n] = '/', hup[n+1] = '\0';
1355 strcat(hup, "ed.hup");
1356 write_file(hup, "w", 1, addr_last);
1357 }
1358 quit(2);
1359 }
1360
1361
1362 void
handle_int(int signo)1363 handle_int(int signo)
1364 {
1365 if (!sigactive)
1366 quit(1);
1367 sigflags &= ~(1 << (signo - 1));
1368 siglongjmp(env, -1);
1369 }
1370
1371
1372 int cols = 72; /* wrap column */
1373
1374 void
handle_winch(int signo)1375 handle_winch(int signo)
1376 {
1377 int save_errno = errno;
1378
1379 struct winsize ws; /* window size structure */
1380
1381 sigflags &= ~(1 << (signo - 1));
1382 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1383 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1384 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1385 }
1386 errno = save_errno;
1387 }
1388
1389
1390 /* is_legal_filename: return a legal filename */
1391 int
is_legal_filename(char * s)1392 is_legal_filename(char *s)
1393 {
1394 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1395 errmsg = "shell access restricted";
1396 return 0;
1397 }
1398 return 1;
1399 }
1400