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