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
31 static const char copyright[] =
32 "@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\
33 All rights reserved.\n";
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
43 * This program is based on the editor algorithm described in
44 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
45 * in Pascal," Addison-Wesley, 1981.
47 * The buffering algorithm is attributed to Rodney Ruddock of
48 * the University of Guelph, Guelph, Ontario.
50 * The cbc.c encryption code is adapted from
51 * the bdes program by Matt Bishop of Dartmouth College,
56 #include <sys/types.h>
58 #include <sys/ioctl.h>
75 char stdinbuf[1]; /* stdin buffer */
76 char *shcmd; /* shell command buffer */
77 int shcmdsz; /* shell command buffer size */
78 int shcmdi; /* shell command buffer index */
79 char *ibuf; /* ed command-line buffer */
80 int ibufsz; /* ed command-line buffer size */
81 char *ibufp; /* pointer to ed command-line buffer */
84 int des = 0; /* if set, use crypt(3) for i/o */
85 int garrulous = 0; /* if set, print all error messages */
86 int isbinary; /* if set, buffer contains ASCII NULs */
87 int isglobal; /* if set, doing a global command */
88 int modified; /* if set, buffer modified since last write */
89 int mutex = 0; /* if set, signals set "sigflags" */
90 int red = 0; /* if set, restrict shell/directory access */
91 int scripted = 0; /* if set, suppress diagnostics */
92 int sigflags = 0; /* if set, signals received while mutex set */
93 int sigactive = 0; /* if set, signal handlers are enabled */
95 char old_filename[PATH_MAX] = ""; /* default filename */
96 long current_addr; /* current address in editor buffer */
97 long addr_last; /* last address in editor buffer */
98 int lineno; /* script line number */
99 const char *prompt; /* command-line prompt */
100 const char *dps = "*"; /* default command-line prompt */
102 const char usage[] = "usage: %s [-] [-sx] [-p string] [file]\n";
104 /* ed: line editor */
106 main(volatile int argc, char ** volatile argv)
111 (void)setlocale(LC_ALL, "");
113 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
115 while ((c = getopt(argc, argv, "p:sx")) != -1)
117 case 'p': /* set prompt */
120 case 's': /* run script */
123 case 'x': /* use crypt */
127 fprintf(stderr, "crypt unavailable\n?\n");
132 fprintf(stderr, usage, red ? "red" : "ed");
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 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 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 errmsg = "warning: file modified";
197 "script, line %d: %s\n",
207 } else if (ibuf[n - 1] != '\n') {
209 errmsg = "unexpected end-of-file";
215 if ((status = extract_addr_range()) >= 0 &&
216 (status = exec_command()) >= 0)
218 (status = display_lines(current_addr, current_addr,
226 fputs("?\n", stderr); /* give warning */
227 errmsg = "warning: file modified";
230 fprintf(stderr, "script, line %d: %s\n",
238 fprintf(stderr, "script, line %d: %s\n",
240 } else if (garrulous)
241 fprintf(stderr, "%s\n", errmsg);
244 fputs("?\n", stderr);
247 fprintf(stderr, "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() do { \
287 errmsg = "invalid address"; \
292 /* next_addr: return the next line address in the command buffer */
297 long addr = current_addr;
303 for (hd = ibufp;; first = 0)
304 switch (c = *ibufp) {
312 if (isdigit((unsigned char)*ibufp)) {
314 addr += (c == '-' || c == '^') ? -n : n;
315 } else if (!isspace((unsigned char)c))
316 addr += (c == '-' || c == '^') ? -1 : 1;
318 case '0': case '1': case '2':
319 case '3': case '4': case '5':
320 case '6': case '7': case '8': case '9':
328 addr = (c == '.') ? current_addr : addr_last;
333 if ((addr = get_matching_node_addr(
334 get_compiled_pattern(), c == '/')) < 0)
336 else if (c == *ibufp)
342 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
351 second_addr = (c == ';') ? current_addr : 1;
359 else if (addr < 0 || addr_last < addr) {
360 errmsg = "invalid address";
370 /* GET_THIRD_ADDR: get a legal address from the command buffer */
371 #define GET_THIRD_ADDR(addr) \
375 ol1 = first_addr, ol2 = second_addr; \
376 if (extract_addr_range() < 0) \
378 else if (addr_cnt == 0) { \
379 errmsg = "destination expected"; \
381 } else if (second_addr < 0 || addr_last < second_addr) { \
382 errmsg = "invalid address"; \
385 addr = second_addr; \
386 first_addr = ol1, second_addr = ol2; \
388 #else /* BACKWARDS */
389 /* GET_THIRD_ADDR: get a legal address from the command buffer */
390 #define GET_THIRD_ADDR(addr) \
394 ol1 = first_addr, ol2 = second_addr; \
395 if (extract_addr_range() < 0) \
397 if (second_addr < 0 || addr_last < second_addr) { \
398 errmsg = "invalid address"; \
401 addr = second_addr; \
402 first_addr = ol1, second_addr = ol2; \
407 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
408 #define GET_COMMAND_SUFFIX() { \
413 gflag |= GPR, ibufp++; \
416 gflag |= GLS, ibufp++; \
419 gflag |= GNP, ibufp++; \
425 if (*ibufp++ != '\n') { \
426 errmsg = "invalid command suffix"; \
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 */
438 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
440 long rows = 22; /* scroll length: ws_row - 2 */
442 /* exec_command: execute the next command in command buffer; return print
447 static pattern_t *pat = NULL;
448 static int sgflag = 0;
449 static long sgnum = 0;
460 switch(c = *ibufp++) {
462 GET_COMMAND_SUFFIX();
463 if (!isglobal) clear_undo_stack();
464 if (append_lines(second_addr) < 0)
468 if (check_addr_range(current_addr, current_addr) < 0)
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)
477 if (check_addr_range(current_addr, current_addr) < 0)
479 GET_COMMAND_SUFFIX();
480 if (!isglobal) clear_undo_stack();
481 if (delete_lines(first_addr, second_addr) < 0)
483 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
487 if (modified && !scripted)
492 errmsg = "unexpected address";
494 } else if (!isspace((unsigned char)*ibufp)) {
495 errmsg = "unexpected command suffix";
497 } else if ((fnp = get_filename()) == NULL)
499 GET_COMMAND_SUFFIX();
500 if (delete_lines(1, addr_last) < 0)
503 if (close_sbuf() < 0)
505 else if (open_sbuf() < 0)
507 if (*fnp && *fnp != '!') strcpy(old_filename, fnp);
509 if (*fnp == '\0' && *old_filename == '\0') {
510 errmsg = "no current filename";
514 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
518 u_current_addr = u_addr_last = -1;
522 errmsg = "unexpected address";
524 } else if (!isspace((unsigned char)*ibufp)) {
525 errmsg = "unexpected command suffix";
527 } else if ((fnp = get_filename()) == NULL)
529 else if (*fnp == '!') {
530 errmsg = "invalid redirection";
533 GET_COMMAND_SUFFIX();
534 if (*fnp) strcpy(old_filename, fnp);
535 printf("%s\n", strip_escapes(old_filename));
542 errmsg = "cannot nest global commands";
544 } else if (check_addr_range(1, addr_last) < 0)
546 else if (build_active_list(c == 'g' || c == 'G') < 0)
548 else if ((n = (c == 'G' || c == 'V')))
549 GET_COMMAND_SUFFIX();
551 if (exec_global(n, gflag) < 0)
556 errmsg = "unexpected address";
559 GET_COMMAND_SUFFIX();
560 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
564 errmsg = "unexpected address";
567 GET_COMMAND_SUFFIX();
568 if ((garrulous = 1 - garrulous) && *errmsg)
569 fprintf(stderr, "%s\n", errmsg);
572 if (second_addr == 0) {
573 errmsg = "invalid address";
576 GET_COMMAND_SUFFIX();
577 if (!isglobal) clear_undo_stack();
578 if (append_lines(second_addr - 1) < 0)
582 if (check_addr_range(current_addr, current_addr + 1) < 0)
584 GET_COMMAND_SUFFIX();
585 if (!isglobal) clear_undo_stack();
586 if (first_addr != second_addr &&
587 join_lines(first_addr, second_addr) < 0)
592 if (second_addr == 0) {
593 errmsg = "invalid address";
596 GET_COMMAND_SUFFIX();
597 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
601 if (check_addr_range(current_addr, current_addr) < 0)
603 GET_COMMAND_SUFFIX();
604 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
609 if (check_addr_range(current_addr, current_addr) < 0)
611 GET_THIRD_ADDR(addr);
612 if (first_addr <= addr && addr < second_addr) {
613 errmsg = "invalid destination";
616 GET_COMMAND_SUFFIX();
617 if (!isglobal) clear_undo_stack();
618 if (move_lines(addr) < 0)
622 if (check_addr_range(current_addr, current_addr) < 0)
624 GET_COMMAND_SUFFIX();
625 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
630 if (check_addr_range(current_addr, current_addr) < 0)
632 GET_COMMAND_SUFFIX();
633 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
639 errmsg = "unexpected address";
642 GET_COMMAND_SUFFIX();
643 prompt = prompt ? NULL : optarg ? optarg : dps;
648 errmsg = "unexpected address";
651 GET_COMMAND_SUFFIX();
652 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
655 if (!isspace((unsigned char)*ibufp)) {
656 errmsg = "unexpected command suffix";
658 } else if (addr_cnt == 0)
659 second_addr = addr_last;
660 if ((fnp = get_filename()) == NULL)
662 GET_COMMAND_SUFFIX();
663 if (!isglobal) clear_undo_stack();
664 if (*old_filename == '\0' && *fnp != '!')
665 strcpy(old_filename, fnp);
667 if (*fnp == '\0' && *old_filename == '\0') {
668 errmsg = "no current filename";
672 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
674 else if (addr && addr != addr_last)
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);
699 sgflag &= ~GSG; /* override GSG */
703 errmsg = "invalid command suffix";
707 } while (sflags && *ibufp != '\n');
708 if (sflags && !pat) {
709 errmsg = "no previous substitution";
711 } else if (sflags & SGG)
712 sgnum = 0; /* override numeric arg */
713 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
714 errmsg = "invalid pattern delimiter";
719 if ((!sflags || (sflags & SGR)) &&
720 (tpat = get_compiled_pattern()) == NULL) {
723 } else if (tpat != pat) {
729 patlock = 1; /* reserve pattern */
732 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
741 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
745 sgflag |= GPR, ibufp++;
748 sgflag |= GLS, ibufp++;
751 sgflag |= GNP, ibufp++;
757 if (check_addr_range(current_addr, current_addr) < 0)
759 GET_COMMAND_SUFFIX();
760 if (!isglobal) clear_undo_stack();
761 if (search_and_replace(pat, sgflag, sgnum) < 0)
765 if (check_addr_range(current_addr, current_addr) < 0)
767 GET_THIRD_ADDR(addr);
768 GET_COMMAND_SUFFIX();
769 if (!isglobal) clear_undo_stack();
770 if (copy_lines(addr) < 0)
775 errmsg = "unexpected address";
778 GET_COMMAND_SUFFIX();
779 if (pop_undo_stack() < 0)
784 if ((n = *ibufp) == 'q' || n == 'Q') {
788 if (!isspace((unsigned char)*ibufp)) {
789 errmsg = "unexpected command suffix";
791 } else if ((fnp = get_filename()) == NULL)
793 if (addr_cnt == 0 && !addr_last)
794 first_addr = second_addr = 0;
795 else if (check_addr_range(1, addr_last) < 0)
797 GET_COMMAND_SUFFIX();
798 if (*old_filename == '\0' && *fnp != '!')
799 strcpy(old_filename, fnp);
801 if (*fnp == '\0' && *old_filename == '\0') {
802 errmsg = "no current filename";
806 if ((addr = write_file(*fnp ? fnp : old_filename,
807 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
809 else if (addr == addr_last)
811 else if (modified && !scripted && n == 'q')
816 errmsg = "unexpected address";
819 GET_COMMAND_SUFFIX();
824 errmsg = "crypt unavailable";
829 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
831 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
834 else if ('0' < *ibufp && *ibufp <= '9')
836 GET_COMMAND_SUFFIX();
837 if (display_lines(second_addr, min(addr_last,
838 second_addr + rows), gflag) < 0)
843 GET_COMMAND_SUFFIX();
844 printf("%ld\n", addr_cnt ? second_addr : addr_last);
848 errmsg = "unexpected address";
850 } else if ((sflags = get_shell_command()) < 0)
852 GET_COMMAND_SUFFIX();
853 if (sflags) printf("%s\n", shcmd + 1);
855 if (!scripted) printf("!\n");
859 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
861 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
863 || display_lines(second_addr, second_addr, 0) < 0)
867 errmsg = "unknown command";
874 /* check_addr_range: return status of address range check */
876 check_addr_range(long n, long m)
882 if (first_addr > second_addr || 1 > first_addr ||
883 second_addr > addr_last) {
884 errmsg = "invalid address";
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
895 get_matching_node_addr(pattern_t *pat, int dir)
898 long n = current_addr;
901 if (!pat) return ERR;
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)
908 NUL_TO_NEWLINE(s, lp->len);
909 if (!regexec(pat, s, 0, NULL, 0))
912 } while (n != current_addr);
918 /* get_filename: return pointer to copy of filename in the command buffer */
922 static char *file = NULL;
923 static int filesz = 0;
927 if (*ibufp != '\n') {
929 if (*ibufp == '\n') {
930 errmsg = "invalid filename";
932 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
934 else if (*ibufp == '!') {
936 if ((n = get_shell_command()) < 0)
939 printf("%s\n", shcmd + 1);
941 } else if (n > PATH_MAX - 1) {
942 errmsg = "filename too long";
947 else if (*old_filename == '\0') {
948 errmsg = "no current filename";
952 REALLOC(file, filesz, PATH_MAX, NULL);
953 for (n = 0; *ibufp != '\n';)
954 file[n++] = *ibufp++;
956 return is_legal_filename(file) ? file : NULL;
960 /* get_shell_command: read a shell command from stdin; return substitution
963 get_shell_command(void)
965 static char *buf = NULL;
968 char *s; /* substitution char pointer */
973 errmsg = "shell access restricted";
975 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
977 REALLOC(buf, n, j + 1, ERR);
978 buf[i++] = '!'; /* prefix command w/ bang */
979 while (*ibufp != '\n')
982 REALLOC(buf, n, i + 2, ERR);
984 if (*ibufp++ == '\\')
989 REALLOC(buf, n, i + 1, ERR);
993 else if (shcmd == NULL || *(shcmd + 1) == '\0')
995 else if (shcmd == NULL)
998 errmsg = "no previous command";
1001 REALLOC(buf, n, i + shcmdi, ERR);
1002 for (s = shcmd + 1; s < shcmd + shcmdi;)
1008 if (*old_filename == '\0') {
1009 errmsg = "no current filename";
1012 j = strlen(s = strip_escapes(old_filename));
1013 REALLOC(buf, n, i + j, ERR);
1019 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1020 memcpy(shcmd, buf, i);
1021 shcmd[shcmdi = i] = '\0';
1022 return *s == '!' || *s == '%';
1026 /* append_lines: insert text from stdin to after line n; stop when either a
1027 single period is read or EOF; return status */
1029 append_lines(long n)
1032 const char *lp = ibuf;
1036 for (current_addr = n;;) {
1038 if ((l = get_tty_line()) < 0)
1040 else if (l == 0 || ibuf[l - 1] != '\n') {
1045 } else if (*(lp = ibufp) == '\0')
1048 while (*ibufp++ != '\n')
1052 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1058 if ((lp = put_sbuf_line(lp)) == NULL) {
1062 up->t = get_addressed_line_node(current_addr);
1063 else if ((up = push_undo_stack(UADD, current_addr,
1064 current_addr)) == NULL) {
1068 } while (lp != eot);
1076 /* join_lines: replace a range of lines with the joined text of those lines */
1078 join_lines(long from, long to)
1080 static char *buf = NULL;
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)
1092 REALLOC(buf, n, size + bp->len, ERR);
1093 memcpy(buf + size, s, bp->len);
1096 REALLOC(buf, n, size + 2, ERR);
1097 memcpy(buf + size, "\n", 2);
1098 if (delete_lines(from, to) < 0)
1100 current_addr = from - 1;
1102 if (put_sbuf_line(buf) == NULL ||
1103 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1113 /* move_lines: move a range of lines */
1115 move_lines(long addr)
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);
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) {
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! */
1138 b2 = get_addressed_line_node(addr);
1139 b1 = get_addressed_line_node(p);
1140 /* this get_addressed_line_node last! */
1143 REQUE(b2, b1->q_forw);
1144 REQUE(a1->q_back, a2);
1146 current_addr = addr + ((addr < first_addr) ?
1147 second_addr - first_addr + 1 : 0);
1150 unset_active_nodes(b2->q_forw, a2);
1157 /* copy_lines: copy a range of lines; return status */
1159 copy_lines(long addr)
1161 line_t *lp, *np = get_addressed_line_node(first_addr);
1163 long n = second_addr - first_addr + 1;
1166 current_addr = addr;
1167 if (first_addr <= addr && addr < second_addr) {
1168 n = addr - first_addr + 1;
1169 m = second_addr - addr;
1171 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1172 for (; n-- > 0; np = np->q_forw) {
1174 if ((lp = dup_line_node(np)) == NULL) {
1181 else if ((up = push_undo_stack(UADD, current_addr,
1182 current_addr)) == NULL) {
1193 /* delete_lines: delete a range of lines */
1195 delete_lines(long from, long to)
1200 if (push_undo_stack(UDEL, from, to) == NULL) {
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! */
1208 unset_active_nodes(p->q_forw, n);
1210 addr_last -= to - from + 1;
1211 current_addr = from - 1;
1218 /* display_lines: print a range of lines to stdout */
1220 display_lines(long from, long to, int gflag)
1227 errmsg = "invalid address";
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)
1235 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1242 #define MAXMARK 26 /* max number of marks */
1244 line_t *mark[MAXMARK]; /* line markers */
1245 int markno; /* line marker count */
1247 /* mark_line_node: set a line node mark */
1249 mark_line_node(line_t *lp, int n)
1251 if (!islower((unsigned char)n)) {
1252 errmsg = "invalid mark character";
1254 } else if (mark[n - 'a'] == NULL)
1261 /* get_marked_node_addr: return address of a marked line */
1263 get_marked_node_addr(int n)
1265 if (!islower((unsigned char)n)) {
1266 errmsg = "invalid mark character";
1269 return get_line_node_addr(mark[n - 'a']);
1273 /* unmark_line_node: clear line node mark */
1275 unmark_line_node(line_t *lp)
1279 for (i = 0; markno && i < MAXMARK; i++)
1280 if (mark[i] == lp) {
1287 /* dup_line_node: return a pointer to a copy of a line node */
1289 dup_line_node(line_t *lp)
1293 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1294 fprintf(stderr, "%s\n", strerror(errno));
1295 errmsg = "out of memory";
1298 np->seek = lp->seek;
1304 /* has_trailing_escape: return the parity of escapes preceding a character
1307 has_trailing_escape(char *s, char *t)
1309 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1313 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1315 strip_escapes(char *s)
1317 static char *file = NULL;
1318 static int filesz = 0;
1322 REALLOC(file, filesz, PATH_MAX, NULL);
1323 while (i < filesz - 1 /* Worry about a possible trailing escape */
1324 && (file[i++] = (*s == '\\') ? *++s : *s))
1331 signal_hup(int signo)
1334 sigflags |= (1 << (signo - 1));
1341 signal_int(int signo)
1344 sigflags |= (1 << (signo - 1));
1351 handle_hup(int signo)
1353 char *hup = NULL; /* hup filename */
1355 char ed_hup[] = "ed.hup";
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) {
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);
1376 handle_int(int signo)
1380 sigflags &= ~(1 << (signo - 1));
1381 #ifdef _POSIX_SOURCE
1382 siglongjmp(env, -1);
1389 int cols = 72; /* wrap column */
1392 handle_winch(int signo)
1394 int save_errno = errno;
1396 struct winsize ws; /* window size structure */
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;
1407 /* is_legal_filename: return a legal filename */
1409 is_legal_filename(char *s)
1411 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1412 errmsg = "shell access restricted";