1 /* main.c: This file contains the main control and user-interface routines
2 for the ed line editor. */
4 * Copyright (c) 1993 Andrew Moore, Talke Studio.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
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: src/bin/ed/main.c,v 1.14.2.4 2001/08/01 02:36:03 obrien Exp $
31 * $DragonFly: src/bin/ed/main.c,v 1.8 2005/03/09 02:38:51 drhodus Exp $
37 * This program is based on the editor algorithm described in
38 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
39 * in Pascal," Addison-Wesley, 1981.
41 * The buffering algorithm is attributed to Rodney Ruddock of
42 * the University of Guelph, Guelph, Ontario.
44 * The cbc.c encryption code is adapted from
45 * the bdes program by Matt Bishop of Dartmouth College,
50 #include <sys/types.h>
52 #include <sys/ioctl.h>
69 char stdinbuf[1]; /* stdin buffer */
70 char *shcmd; /* shell command buffer */
71 int shcmdsz; /* shell command buffer size */
72 int shcmdi; /* shell command buffer index */
73 char *ibuf; /* ed command-line buffer */
74 int ibufsz; /* ed command-line buffer size */
75 char *ibufp; /* pointer to ed command-line buffer */
78 int des = 0; /* if set, use crypt(3) for i/o */
79 int garrulous = 0; /* if set, print all error messages */
80 int isbinary; /* if set, buffer contains ASCII NULs */
81 int isglobal; /* if set, doing a global command */
82 int modified; /* if set, buffer modified since last write */
83 int mutex = 0; /* if set, signals set "sigflags" */
84 int red = 0; /* if set, restrict shell/directory access */
85 int scripted = 0; /* if set, suppress diagnostics */
86 int sigflags = 0; /* if set, signals received while mutex set */
87 int sigactive = 0; /* if set, signal handlers are enabled */
89 char old_filename[PATH_MAX] = ""; /* default filename */
90 long current_addr; /* current address in editor buffer */
91 long addr_last; /* last address in editor buffer */
92 int lineno; /* script line number */
93 const char *prompt; /* command-line prompt */
94 const char *dps = "*"; /* default command-line prompt */
96 const char usage[] = "usage: %s [-] [-sx] [-p string] [name]\n";
100 main(int argc, char **argv)
105 /* Avoid longjmp clobbering */
110 setlocale(LC_ALL, "");
112 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
114 while ((c = getopt(argc, argv, "p:sx")) != -1)
116 case 'p': /* set prompt */
119 case 's': /* run script */
122 case 'x': /* use crypt */
127 fprintf(stderr, "crypt unavailable\n?\n");
132 fprintf(stderr, usage, argv[0]);
137 if (argc && **argv == '-') {
146 /* assert: reliable signals! */
148 handle_winch(SIGWINCH);
149 if (isatty(0)) signal(SIGWINCH, handle_winch);
151 signal(SIGHUP, signal_hup);
152 signal(SIGQUIT, SIG_IGN);
153 signal(SIGINT, signal_int);
155 if ((status = sigsetjmp(env, 1)))
157 if ((status = setjmp(env)))
160 fputs("\n?\n", stderr);
161 sprintf(errmsg, "interrupt");
164 sigactive = 1; /* enable signal handlers */
165 if (argc && **argv && is_legal_filename(*argv)) {
166 if (read_file(*argv, 0) < 0 && !isatty(0))
168 else if (**argv != '!')
169 if (strlcpy(old_filename, *argv, sizeof(old_filename))
170 >= sizeof(old_filename))
173 fputs("?\n", stderr);
175 sprintf(errmsg, "invalid filename");
181 if (status < 0 && garrulous)
182 fprintf(stderr, "%s\n", errmsg);
184 printf("%s", prompt);
187 if ((n = get_tty_line()) < 0) {
191 if (modified && !scripted) {
192 fputs("?\n", stderr);
193 sprintf(errmsg, "warning: file modified");
195 fprintf(stderr, garrulous ?
196 "script, line %d: %s\n" :
206 } else if (ibuf[n - 1] != '\n') {
208 sprintf(errmsg, "unexpected end-of-file");
214 if ((status = extract_addr_range()) >= 0 &&
215 (status = exec_command()) >= 0)
217 (status = display_lines(current_addr, current_addr,
225 fputs("?\n", stderr); /* give warning */
226 sprintf(errmsg, "warning: file modified");
228 fprintf(stderr, garrulous ?
229 "script, line %d: %s\n" :
236 fprintf(stderr, garrulous ?
237 "script, line %d: %s\n" : "",
240 fprintf(stderr, garrulous ? "%s\n" : "",
244 fputs("?\n", stderr);
246 fprintf(stderr, garrulous ?
247 "script, line %d: %s\n" : "",
257 long first_addr, second_addr, addr_cnt;
259 /* extract_addr_range: get line addresses from the command buffer until an
260 illegal address is seen; return status */
262 extract_addr_range(void)
267 first_addr = second_addr = current_addr;
268 while ((addr = next_addr()) >= 0) {
270 first_addr = second_addr;
272 if (*ibufp != ',' && *ibufp != ';')
274 else if (*ibufp++ == ';')
277 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
278 first_addr = second_addr;
279 return (addr == ERR) ? ERR : 0;
283 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
285 #define MUST_BE_FIRST() \
286 if (!first) { sprintf(errmsg, "invalid address"); return ERR; }
288 /* next_addr: return the next line address in the command buffer */
293 long addr = current_addr;
299 for (hd = ibufp;; first = 0)
300 switch (c = *ibufp) {
308 if (isdigit((unsigned char)*ibufp)) {
310 addr += (c == '-' || c == '^') ? -n : n;
311 } else if (!isspace((unsigned char)c))
312 addr += (c == '-' || c == '^') ? -1 : 1;
314 case '0': case '1': case '2':
315 case '3': case '4': case '5':
316 case '6': case '7': case '8': case '9':
324 addr = (c == '.') ? current_addr : addr_last;
329 if ((addr = get_matching_node_addr(
330 get_compiled_pattern(), c == '/')) < 0)
332 else if (c == *ibufp)
338 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
347 second_addr = (c == ';') ? current_addr : 1;
355 else if (addr < 0 || addr_last < addr) {
356 sprintf(errmsg, "invalid address");
366 /* GET_THIRD_ADDR: get a legal address from the command buffer */
367 #define GET_THIRD_ADDR(addr) \
371 ol1 = first_addr, ol2 = second_addr; \
372 if (extract_addr_range() < 0) \
374 else if (addr_cnt == 0) { \
375 sprintf(errmsg, "destination expected"); \
377 } else if (second_addr < 0 || addr_last < second_addr) { \
378 sprintf(errmsg, "invalid address"); \
381 addr = second_addr; \
382 first_addr = ol1, second_addr = ol2; \
384 #else /* BACKWARDS */
385 /* GET_THIRD_ADDR: get a legal address from the command buffer */
386 #define GET_THIRD_ADDR(addr) \
390 ol1 = first_addr, ol2 = second_addr; \
391 if (extract_addr_range() < 0) \
393 if (second_addr < 0 || addr_last < second_addr) { \
394 sprintf(errmsg, "invalid address"); \
397 addr = second_addr; \
398 first_addr = ol1, second_addr = ol2; \
403 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
404 #define GET_COMMAND_SUFFIX() { \
409 gflag |= GPR, ibufp++; \
412 gflag |= GLS, ibufp++; \
415 gflag |= GNP, ibufp++; \
421 if (*ibufp++ != '\n') { \
422 sprintf(errmsg, "invalid command suffix"); \
429 #define SGG 001 /* complement previous global substitute suffix */
430 #define SGP 002 /* complement previous print suffix */
431 #define SGR 004 /* use last regex instead of last pat */
432 #define SGF 010 /* repeat last substitution */
434 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
436 long rows = 22; /* scroll length: ws_row - 2 */
438 /* exec_command: execute the next command in command buffer; return print
443 static pattern_t *pat = NULL;
444 static int sgflag = 0;
445 static long sgnum = 0;
456 switch(c = *ibufp++) {
458 GET_COMMAND_SUFFIX();
459 if (!isglobal) clear_undo_stack();
460 if (append_lines(second_addr) < 0)
464 if (check_addr_range(current_addr, current_addr) < 0)
466 GET_COMMAND_SUFFIX();
467 if (!isglobal) clear_undo_stack();
468 if (delete_lines(first_addr, second_addr) < 0 ||
469 append_lines(current_addr) < 0)
473 if (check_addr_range(current_addr, current_addr) < 0)
475 GET_COMMAND_SUFFIX();
476 if (!isglobal) clear_undo_stack();
477 if (delete_lines(first_addr, second_addr) < 0)
479 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
483 if (modified && !scripted)
488 sprintf(errmsg, "unexpected address");
490 } else if (!isspace((unsigned char)*ibufp)) {
491 sprintf(errmsg, "unexpected command suffix");
493 } else if ((fnp = get_filename()) == NULL)
495 GET_COMMAND_SUFFIX();
496 if (delete_lines(1, addr_last) < 0)
499 if (close_sbuf() < 0)
501 else if (open_sbuf() < 0)
503 if (*fnp && *fnp != '!') strcpy(old_filename, fnp);
505 if (*fnp == '\0' && *old_filename == '\0') {
506 sprintf(errmsg, "no current filename");
510 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
514 u_current_addr = u_addr_last = -1;
518 sprintf(errmsg, "unexpected address");
520 } else if (!isspace((unsigned char)*ibufp)) {
521 sprintf(errmsg, "unexpected command suffix");
523 } else if ((fnp = get_filename()) == NULL)
525 else if (*fnp == '!') {
526 sprintf(errmsg, "invalid redirection");
529 GET_COMMAND_SUFFIX();
530 if (*fnp) strcpy(old_filename, fnp);
531 printf("%s\n", strip_escapes(old_filename));
538 sprintf(errmsg, "cannot nest global commands");
540 } else if (check_addr_range(1, addr_last) < 0)
542 else if (build_active_list(c == 'g' || c == 'G') < 0)
544 else if ((n = (c == 'G' || c == 'V')))
545 GET_COMMAND_SUFFIX();
547 if (exec_global(n, gflag) < 0)
552 sprintf(errmsg, "unexpected address");
555 GET_COMMAND_SUFFIX();
556 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
560 sprintf(errmsg, "unexpected address");
563 GET_COMMAND_SUFFIX();
564 if ((garrulous = 1 - garrulous) && *errmsg)
565 fprintf(stderr, "%s\n", errmsg);
568 if (second_addr == 0) {
569 sprintf(errmsg, "invalid address");
572 GET_COMMAND_SUFFIX();
573 if (!isglobal) clear_undo_stack();
574 if (append_lines(second_addr - 1) < 0)
578 if (check_addr_range(current_addr, current_addr + 1) < 0)
580 GET_COMMAND_SUFFIX();
581 if (!isglobal) clear_undo_stack();
582 if (first_addr != second_addr &&
583 join_lines(first_addr, second_addr) < 0)
588 if (second_addr == 0) {
589 sprintf(errmsg, "invalid address");
592 GET_COMMAND_SUFFIX();
593 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
597 if (check_addr_range(current_addr, current_addr) < 0)
599 GET_COMMAND_SUFFIX();
600 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
605 if (check_addr_range(current_addr, current_addr) < 0)
607 GET_THIRD_ADDR(addr);
608 if (first_addr <= addr && addr < second_addr) {
609 sprintf(errmsg, "invalid destination");
612 GET_COMMAND_SUFFIX();
613 if (!isglobal) clear_undo_stack();
614 if (move_lines(addr) < 0)
618 if (check_addr_range(current_addr, current_addr) < 0)
620 GET_COMMAND_SUFFIX();
621 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
626 if (check_addr_range(current_addr, current_addr) < 0)
628 GET_COMMAND_SUFFIX();
629 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
635 sprintf(errmsg, "unexpected address");
638 GET_COMMAND_SUFFIX();
639 prompt = prompt ? NULL : optarg ? optarg : dps;
644 sprintf(errmsg, "unexpected address");
647 GET_COMMAND_SUFFIX();
648 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
651 if (!isspace((unsigned char)*ibufp)) {
652 sprintf(errmsg, "unexpected command suffix");
654 } else if (addr_cnt == 0)
655 second_addr = addr_last;
656 if ((fnp = get_filename()) == NULL)
658 GET_COMMAND_SUFFIX();
659 if (!isglobal) clear_undo_stack();
660 if (*old_filename == '\0' && *fnp != '!')
661 strcpy(old_filename, fnp);
663 if (*fnp == '\0' && *old_filename == '\0') {
664 sprintf(errmsg, "no current filename");
668 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
670 else if (addr && addr != addr_last)
691 case '0': case '1': case '2': case '3': case '4':
692 case '5': case '6': case '7': case '8': case '9':
693 STRTOL(sgnum, ibufp);
695 sgflag &= ~GSG; /* override GSG */
699 sprintf(errmsg, "invalid command suffix");
703 } while (sflags && *ibufp != '\n');
704 if (sflags && !pat) {
705 sprintf(errmsg, "no previous substitution");
707 } else if (sflags & SGG)
708 sgnum = 0; /* override numeric arg */
709 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
710 sprintf(errmsg, "invalid pattern delimiter");
715 if ((!sflags || (sflags & SGR)) &&
716 (tpat = get_compiled_pattern()) == NULL) {
719 } else if (tpat != pat) {
725 patlock = 1; /* reserve pattern */
728 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
737 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
741 sgflag |= GPR, ibufp++;
744 sgflag |= GLS, ibufp++;
747 sgflag |= GNP, ibufp++;
753 if (check_addr_range(current_addr, current_addr) < 0)
755 GET_COMMAND_SUFFIX();
756 if (!isglobal) clear_undo_stack();
757 if (search_and_replace(pat, sgflag, sgnum) < 0)
761 if (check_addr_range(current_addr, current_addr) < 0)
763 GET_THIRD_ADDR(addr);
764 GET_COMMAND_SUFFIX();
765 if (!isglobal) clear_undo_stack();
766 if (copy_lines(addr) < 0)
771 sprintf(errmsg, "unexpected address");
774 GET_COMMAND_SUFFIX();
775 if (pop_undo_stack() < 0)
780 if ((n = *ibufp) == 'q' || n == 'Q') {
784 if (!isspace((unsigned char)*ibufp)) {
785 sprintf(errmsg, "unexpected command suffix");
787 } else if ((fnp = get_filename()) == NULL)
789 if (addr_cnt == 0 && !addr_last)
790 first_addr = second_addr = 0;
791 else if (check_addr_range(1, addr_last) < 0)
793 GET_COMMAND_SUFFIX();
794 if (*old_filename == '\0' && *fnp != '!')
795 strcpy(old_filename, fnp);
797 if (*fnp == '\0' && *old_filename == '\0') {
798 sprintf(errmsg, "no current filename");
802 if ((addr = write_file(*fnp ? fnp : old_filename,
803 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
805 else if (addr == addr_last)
807 else if (modified && !scripted && n == 'q')
812 sprintf(errmsg, "unexpected address");
815 GET_COMMAND_SUFFIX();
819 sprintf(errmsg, "crypt unavailable");
824 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
826 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
829 else if ('0' < *ibufp && *ibufp <= '9')
831 GET_COMMAND_SUFFIX();
832 if (display_lines(second_addr, min(addr_last,
833 second_addr + rows), gflag) < 0)
838 GET_COMMAND_SUFFIX();
839 printf("%ld\n", addr_cnt ? second_addr : addr_last);
843 sprintf(errmsg, "unexpected address");
845 } else if ((sflags = get_shell_command()) < 0)
847 GET_COMMAND_SUFFIX();
848 if (sflags) printf("%s\n", shcmd + 1);
850 if (!scripted) printf("!\n");
854 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
856 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
858 || display_lines(second_addr, second_addr, 0) < 0)
862 sprintf(errmsg, "unknown command");
869 /* check_addr_range: return status of address range check */
871 check_addr_range(long n, long m)
877 if (first_addr > second_addr || 1 > first_addr ||
878 second_addr > addr_last) {
879 sprintf(errmsg, "invalid address");
886 /* get_matching_node_addr: return the address of the next line matching a
887 pattern in a given direction. wrap around begin/end of editor buffer if
890 get_matching_node_addr(pattern_t *pat, int dir)
893 long n = current_addr;
896 if (!pat) return ERR;
898 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
899 lp = get_addressed_line_node(n);
900 if ((s = get_sbuf_line(lp)) == NULL)
903 NUL_TO_NEWLINE(s, lp->len);
904 if (!regexec(pat, s, 0, NULL, 0))
907 } while (n != current_addr);
908 sprintf(errmsg, "no match");
913 /* get_filename: return pointer to copy of filename in the command buffer */
917 static char *file = NULL;
918 static int filesz = 0;
922 if (*ibufp != '\n') {
924 if (*ibufp == '\n') {
925 sprintf(errmsg, "invalid filename");
927 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
929 else if (*ibufp == '!') {
931 if ((n = get_shell_command()) < 0)
934 printf("%s\n", shcmd + 1);
936 } else if (n > PATH_MAX - 1) {
937 sprintf(errmsg, "filename too long");
942 else if (*old_filename == '\0') {
943 sprintf(errmsg, "no current filename");
947 REALLOC(file, filesz, PATH_MAX, NULL);
948 for (n = 0; *ibufp != '\n';)
949 file[n++] = *ibufp++;
951 return is_legal_filename(file) ? file : NULL;
955 /* get_shell_command: read a shell command from stdin; return substitution
958 get_shell_command(void)
960 static char *buf = NULL;
963 char *s; /* substitution char pointer */
968 sprintf(errmsg, "shell access restricted");
970 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
972 REALLOC(buf, n, j + 1, ERR);
973 buf[i++] = '!'; /* prefix command w/ bang */
974 while (*ibufp != '\n')
977 REALLOC(buf, n, i + 2, ERR);
979 if (*ibufp++ == '\\')
984 REALLOC(buf, n, i + 1, ERR);
988 else if (shcmd == NULL || *(shcmd + 1) == '\0')
990 else if (shcmd == NULL)
993 sprintf(errmsg, "no previous command");
996 REALLOC(buf, n, i + shcmdi, ERR);
997 for (s = shcmd + 1; s < shcmd + shcmdi;)
1003 if (*old_filename == '\0') {
1004 sprintf(errmsg, "no current filename");
1007 j = strlen(s = strip_escapes(old_filename));
1008 REALLOC(buf, n, i + j, ERR);
1014 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1015 memcpy(shcmd, buf, i);
1016 shcmd[shcmdi = i] = '\0';
1017 return *s == '!' || *s == '%';
1021 /* append_lines: insert text from stdin to after line n; stop when either a
1022 single period is read or EOF; return status */
1024 append_lines(long n)
1031 for (current_addr = n;;) {
1033 if ((l = get_tty_line()) < 0)
1035 else if (l == 0 || ibuf[l - 1] != '\n') {
1040 } else if (*(lp = ibufp) == '\0')
1043 while (*ibufp++ != '\n')
1047 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1053 if ((lp = put_sbuf_line(lp)) == NULL) {
1057 up->t = get_addressed_line_node(current_addr);
1058 else if ((up = push_undo_stack(UADD, current_addr,
1059 current_addr)) == NULL) {
1063 } while (lp != eot);
1071 /* join_lines: replace a range of lines with the joined text of those lines */
1073 join_lines(long from, long to)
1075 static char *buf = NULL;
1082 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1083 bp = get_addressed_line_node(from);
1084 for (; bp != ep; bp = bp->q_forw) {
1085 if ((s = get_sbuf_line(bp)) == NULL)
1087 REALLOC(buf, n, size + bp->len, ERR);
1088 memcpy(buf + size, s, bp->len);
1091 REALLOC(buf, n, size + 2, ERR);
1092 memcpy(buf + size, "\n", 2);
1093 if (delete_lines(from, to) < 0)
1095 current_addr = from - 1;
1097 if (put_sbuf_line(buf) == NULL ||
1098 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1108 /* move_lines: move a range of lines */
1110 move_lines(long addr)
1112 line_t *b1, *a1, *b2, *a2;
1113 long n = INC_MOD(second_addr, addr_last);
1114 long p = first_addr - 1;
1115 int done = (addr == first_addr - 1 || addr == second_addr);
1119 a2 = get_addressed_line_node(n);
1120 b2 = get_addressed_line_node(p);
1121 current_addr = second_addr;
1122 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1123 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1127 a1 = get_addressed_line_node(n);
1128 if (addr < first_addr) {
1129 b1 = get_addressed_line_node(p);
1130 b2 = get_addressed_line_node(addr);
1131 /* this get_addressed_line_node last! */
1133 b2 = get_addressed_line_node(addr);
1134 b1 = get_addressed_line_node(p);
1135 /* this get_addressed_line_node last! */
1138 REQUE(b2, b1->q_forw);
1139 REQUE(a1->q_back, a2);
1141 current_addr = addr + ((addr < first_addr) ?
1142 second_addr - first_addr + 1 : 0);
1145 unset_active_nodes(b2->q_forw, a2);
1152 /* copy_lines: copy a range of lines; return status */
1154 copy_lines(long addr)
1156 line_t *lp, *np = get_addressed_line_node(first_addr);
1158 long n = second_addr - first_addr + 1;
1161 current_addr = addr;
1162 if (first_addr <= addr && addr < second_addr) {
1163 n = addr - first_addr + 1;
1164 m = second_addr - addr;
1166 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1167 for (; n-- > 0; np = np->q_forw) {
1169 if ((lp = dup_line_node(np)) == NULL) {
1176 else if ((up = push_undo_stack(UADD, current_addr,
1177 current_addr)) == NULL) {
1188 /* delete_lines: delete a range of lines */
1190 delete_lines(long from, long to)
1195 if (push_undo_stack(UDEL, from, to) == NULL) {
1199 n = get_addressed_line_node(INC_MOD(to, addr_last));
1200 p = get_addressed_line_node(from - 1);
1201 /* this get_addressed_line_node last! */
1203 unset_active_nodes(p->q_forw, n);
1205 addr_last -= to - from + 1;
1206 current_addr = from - 1;
1213 /* display_lines: print a range of lines to stdout */
1215 display_lines(long from, long to, int gflag)
1222 sprintf(errmsg, "invalid address");
1225 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1226 bp = get_addressed_line_node(from);
1227 for (; bp != ep; bp = bp->q_forw) {
1228 if ((s = get_sbuf_line(bp)) == NULL)
1230 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1237 #define MAXMARK 26 /* max number of marks */
1239 line_t *mark[MAXMARK]; /* line markers */
1240 int markno; /* line marker count */
1242 /* mark_line_node: set a line node mark */
1244 mark_line_node(line_t *lp, int n)
1246 if (!islower((unsigned char)n)) {
1247 sprintf(errmsg, "invalid mark character");
1249 } else if (mark[n - 'a'] == NULL)
1256 /* get_marked_node_addr: return address of a marked line */
1258 get_marked_node_addr(int n)
1260 if (!islower((unsigned char)n)) {
1261 sprintf(errmsg, "invalid mark character");
1264 return get_line_node_addr(mark[n - 'a']);
1268 /* unmark_line_node: clear line node mark */
1270 unmark_line_node(line_t *lp)
1274 for (i = 0; markno && i < MAXMARK; i++)
1275 if (mark[i] == lp) {
1282 /* dup_line_node: return a pointer to a copy of a line node */
1284 dup_line_node(line_t *lp)
1288 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1289 fprintf(stderr, "%s\n", strerror(errno));
1290 sprintf(errmsg, "out of memory");
1293 np->seek = lp->seek;
1299 /* has_trailing_escape: return the parity of escapes preceding a character
1302 has_trailing_escape(char *s, char *t)
1304 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1308 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1310 strip_escapes(const char *s)
1312 static char *file = NULL;
1313 static int filesz = 0;
1317 REALLOC(file, filesz, PATH_MAX, NULL);
1318 while (i < filesz - 1 /* Worry about a possible trailing escape */
1319 && (file[i++] = (*s == '\\') ? *++s : *s))
1326 signal_hup(int signo)
1329 sigflags |= (1 << (signo - 1));
1336 signal_int(int signo)
1339 sigflags |= (1 << (signo - 1));
1346 handle_hup(int signo)
1348 char *hup = NULL; /* hup filename */
1354 sigflags &= ~(1 << (signo - 1));
1355 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 &&
1356 (s = getenv("HOME")) != NULL &&
1357 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */
1358 (hup = (char *) malloc(n + 10)) != NULL) {
1360 if (hup[n - 1] != '/')
1361 hup[n] = '/', hup[n+1] = '\0';
1362 strcat(hup, "ed.hup");
1363 write_file(hup, "w", 1, addr_last);
1370 handle_int(int signo)
1374 sigflags &= ~(1 << (signo - 1));
1375 #ifdef _POSIX_SOURCE
1376 siglongjmp(env, -1);
1383 int cols = 72; /* wrap column */
1386 handle_winch(int signo)
1388 int save_errno = errno;
1390 struct winsize ws; /* window size structure */
1392 sigflags &= ~(1 << (signo - 1));
1393 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1394 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1395 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1401 /* is_legal_filename: return a legal filename */
1403 is_legal_filename(char *s)
1405 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1406 sprintf(errmsg, "shell access restricted");