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: head/bin/ed/main.c 241720 2012-10-19 05:43:38Z ed $
36 * This program is based on the editor algorithm described in
37 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
38 * in Pascal," Addison-Wesley, 1981.
40 * The buffering algorithm is attributed to Rodney Ruddock of
41 * the University of Guelph, Guelph, Ontario.
43 * The cbc.c encryption code is adapted from
44 * the bdes program by Matt Bishop of Dartmouth College,
49 #include <sys/types.h>
51 #include <sys/ioctl.h>
62 static sigjmp_buf env
;
68 char stdinbuf
[1]; /* stdin buffer */
69 static char *shcmd
; /* shell command buffer */
70 static int shcmdsz
; /* shell command buffer size */
71 static int shcmdi
; /* shell command buffer index */
72 char *ibuf
; /* ed command-line buffer */
73 int ibufsz
; /* ed command-line buffer size */
74 char *ibufp
; /* pointer to ed command-line buffer */
77 int des
= 0; /* if set, use crypt(3) for i/o */
78 static int garrulous
= 0; /* if set, print all error messages */
79 int isbinary
; /* if set, buffer contains ASCII NULs */
80 int isglobal
; /* if set, doing a global command */
81 int modified
; /* if set, buffer modified since last write */
82 int mutex
= 0; /* if set, signals set "sigflags" */
83 static int red
= 0; /* if set, restrict shell/directory access */
84 int scripted
= 0; /* if set, suppress diagnostics */
85 int sigflags
= 0; /* if set, signals received while mutex set */
86 static int sigactive
= 0; /* if set, signal handlers are enabled */
88 static char old_filename
[PATH_MAX
] = ""; /* default filename */
89 long current_addr
; /* current address in editor buffer */
90 long addr_last
; /* last address in editor buffer */
91 int lineno
; /* script line number */
92 static const char *prompt
; /* command-line prompt */
93 static const char *dps
= "*"; /* default command-line prompt */
95 static const char *usage
= "usage: %s [-] [-sx] [-p string] [file]\n";
99 main(volatile int argc
, char ** volatile argv
)
104 setlocale(LC_ALL
, "");
106 red
= (n
= strlen(argv
[0])) > 2 && argv
[0][n
- 3] == 'r';
108 while ((c
= getopt(argc
, argv
, "p:sx")) != -1)
110 case 'p': /* set prompt */
113 case 's': /* run script */
116 case 'x': /* use crypt */
120 fprintf(stderr
, "crypt unavailable\n?\n");
125 fprintf(stderr
, usage
, red
? "red" : "ed");
130 if (argc
&& **argv
== '-') {
139 /* assert: reliable signals! */
141 handle_winch(SIGWINCH
);
142 if (isatty(0)) signal(SIGWINCH
, handle_winch
);
144 signal(SIGHUP
, signal_hup
);
145 signal(SIGQUIT
, SIG_IGN
);
146 signal(SIGINT
, signal_int
);
148 if ((status
= sigsetjmp(env
, 1)))
150 if ((status
= setjmp(env
)))
153 fputs("\n?\n", stderr
);
154 errmsg
= "interrupt";
157 sigactive
= 1; /* enable signal handlers */
158 if (argc
&& **argv
&& is_legal_filename(*argv
)) {
159 if (read_file(*argv
, 0) < 0 && !isatty(0))
161 else if (**argv
!= '!')
162 if (strlcpy(old_filename
, *argv
, sizeof(old_filename
))
163 >= sizeof(old_filename
))
166 fputs("?\n", stderr
);
168 errmsg
= "invalid filename";
174 if (status
< 0 && garrulous
)
175 fprintf(stderr
, "%s\n", errmsg
);
177 printf("%s", prompt
);
180 if ((n
= get_tty_line()) < 0) {
184 if (modified
&& !scripted
) {
185 fputs("?\n", stderr
);
186 errmsg
= "warning: file modified";
190 "script, line %d: %s\n",
200 } else if (ibuf
[n
- 1] != '\n') {
202 errmsg
= "unexpected end-of-file";
208 if ((status
= extract_addr_range()) >= 0 &&
209 (status
= exec_command()) >= 0)
211 (status
= display_lines(current_addr
, current_addr
,
219 fputs("?\n", stderr
); /* give warning */
220 errmsg
= "warning: file modified";
223 fprintf(stderr
, "script, line %d: %s\n",
231 fprintf(stderr
, "script, line %d: %s\n",
233 } else if (garrulous
)
234 fprintf(stderr
, "%s\n", errmsg
);
237 fputs("?\n", stderr
);
240 fprintf(stderr
, "script, line %d: %s\n",
250 long first_addr
, second_addr
;
251 static long addr_cnt
;
253 /* extract_addr_range: get line addresses from the command buffer until an
254 illegal address is seen; return status */
256 extract_addr_range(void)
261 first_addr
= second_addr
= current_addr
;
262 while ((addr
= next_addr()) >= 0) {
264 first_addr
= second_addr
;
266 if (*ibufp
!= ',' && *ibufp
!= ';')
268 else if (*ibufp
++ == ';')
271 if ((addr_cnt
= min(addr_cnt
, 2)) == 1 || second_addr
!= addr
)
272 first_addr
= second_addr
;
273 return (addr
== ERR
) ? ERR
: 0;
277 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
279 #define MUST_BE_FIRST() do { \
281 errmsg = "invalid address"; \
286 /* next_addr: return the next line address in the command buffer */
291 long addr
= current_addr
;
297 for (hd
= ibufp
;; first
= 0)
298 switch (c
= *ibufp
) {
306 if (isdigit((unsigned char)*ibufp
)) {
308 addr
+= (c
== '-' || c
== '^') ? -n
: n
;
309 } else if (!isspace((unsigned char)c
))
310 addr
+= (c
== '-' || c
== '^') ? -1 : 1;
312 case '0': case '1': case '2':
313 case '3': case '4': case '5':
314 case '6': case '7': case '8': case '9':
322 addr
= (c
== '.') ? current_addr
: addr_last
;
327 if ((addr
= get_matching_node_addr(
328 get_compiled_pattern(), c
== '/')) < 0)
330 else if (c
== *ibufp
)
336 if ((addr
= get_marked_node_addr(*ibufp
++)) < 0)
345 second_addr
= (c
== ';') ? current_addr
: 1;
353 else if (addr
< 0 || addr_last
< addr
) {
354 errmsg
= "invalid address";
364 /* GET_THIRD_ADDR: get a legal address from the command buffer */
365 #define GET_THIRD_ADDR(addr) \
369 ol1 = first_addr, ol2 = second_addr; \
370 if (extract_addr_range() < 0) \
372 else if (addr_cnt == 0) { \
373 errmsg = "destination expected"; \
375 } else if (second_addr < 0 || addr_last < second_addr) { \
376 errmsg = "invalid address"; \
379 addr = second_addr; \
380 first_addr = ol1, second_addr = ol2; \
382 #else /* BACKWARDS */
383 /* GET_THIRD_ADDR: get a legal address from the command buffer */
384 #define GET_THIRD_ADDR(addr) \
388 ol1 = first_addr, ol2 = second_addr; \
389 if (extract_addr_range() < 0) \
391 if (second_addr < 0 || addr_last < second_addr) { \
392 errmsg = "invalid address"; \
395 addr = second_addr; \
396 first_addr = ol1, second_addr = ol2; \
401 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
402 #define GET_COMMAND_SUFFIX() { \
407 gflag |= GPR, ibufp++; \
410 gflag |= GLS, ibufp++; \
413 gflag |= GNP, ibufp++; \
419 if (*ibufp++ != '\n') { \
420 errmsg = "invalid command suffix"; \
427 #define SGG 001 /* complement previous global substitute suffix */
428 #define SGP 002 /* complement previous print suffix */
429 #define SGR 004 /* use last regex instead of last pat */
430 #define SGF 010 /* repeat last substitution */
432 int patlock
= 0; /* if set, pattern not freed by get_compiled_pattern() */
434 long rows
= 22; /* scroll length: ws_row - 2 */
436 /* exec_command: execute the next command in command buffer; return print
441 static pattern_t
*pat
= NULL
;
442 static int sgflag
= 0;
443 static long sgnum
= 0;
454 switch(c
= *ibufp
++) {
456 GET_COMMAND_SUFFIX();
457 if (!isglobal
) clear_undo_stack();
458 if (append_lines(second_addr
) < 0)
462 if (check_addr_range(current_addr
, current_addr
) < 0)
464 GET_COMMAND_SUFFIX();
465 if (!isglobal
) clear_undo_stack();
466 if (delete_lines(first_addr
, second_addr
) < 0 ||
467 append_lines(current_addr
) < 0)
471 if (check_addr_range(current_addr
, current_addr
) < 0)
473 GET_COMMAND_SUFFIX();
474 if (!isglobal
) clear_undo_stack();
475 if (delete_lines(first_addr
, second_addr
) < 0)
477 else if ((addr
= INC_MOD(current_addr
, addr_last
)) != 0)
481 if (modified
&& !scripted
)
486 errmsg
= "unexpected address";
488 } else if (!isspace((unsigned char)*ibufp
)) {
489 errmsg
= "unexpected command suffix";
491 } else if ((fnp
= get_filename()) == NULL
)
493 GET_COMMAND_SUFFIX();
494 if (delete_lines(1, addr_last
) < 0)
497 if (close_sbuf() < 0)
499 else if (open_sbuf() < 0)
501 if (*fnp
&& *fnp
!= '!') strcpy(old_filename
, fnp
);
503 if (*fnp
== '\0' && *old_filename
== '\0') {
504 errmsg
= "no current filename";
508 if (read_file(*fnp
? fnp
: old_filename
, 0) < 0)
512 u_current_addr
= u_addr_last
= -1;
516 errmsg
= "unexpected address";
518 } else if (!isspace((unsigned char)*ibufp
)) {
519 errmsg
= "unexpected command suffix";
521 } else if ((fnp
= get_filename()) == NULL
)
523 else if (*fnp
== '!') {
524 errmsg
= "invalid redirection";
527 GET_COMMAND_SUFFIX();
528 if (*fnp
) strcpy(old_filename
, fnp
);
529 printf("%s\n", strip_escapes(old_filename
));
536 errmsg
= "cannot nest global commands";
538 } else if (check_addr_range(1, addr_last
) < 0)
540 else if (build_active_list(c
== 'g' || c
== 'G') < 0)
542 else if ((n
= (c
== 'G' || c
== 'V')))
543 GET_COMMAND_SUFFIX();
545 if (exec_global(n
, gflag
) < 0)
550 errmsg
= "unexpected address";
553 GET_COMMAND_SUFFIX();
554 if (*errmsg
) fprintf(stderr
, "%s\n", errmsg
);
558 errmsg
= "unexpected address";
561 GET_COMMAND_SUFFIX();
562 if ((garrulous
= 1 - garrulous
) && *errmsg
)
563 fprintf(stderr
, "%s\n", errmsg
);
566 if (second_addr
== 0) {
567 errmsg
= "invalid address";
570 GET_COMMAND_SUFFIX();
571 if (!isglobal
) clear_undo_stack();
572 if (append_lines(second_addr
- 1) < 0)
576 if (check_addr_range(current_addr
, current_addr
+ 1) < 0)
578 GET_COMMAND_SUFFIX();
579 if (!isglobal
) clear_undo_stack();
580 if (first_addr
!= second_addr
&&
581 join_lines(first_addr
, second_addr
) < 0)
586 if (second_addr
== 0) {
587 errmsg
= "invalid address";
590 GET_COMMAND_SUFFIX();
591 if (mark_line_node(get_addressed_line_node(second_addr
), c
) < 0)
595 if (check_addr_range(current_addr
, current_addr
) < 0)
597 GET_COMMAND_SUFFIX();
598 if (display_lines(first_addr
, second_addr
, gflag
| GLS
) < 0)
603 if (check_addr_range(current_addr
, current_addr
) < 0)
605 GET_THIRD_ADDR(addr
);
606 if (first_addr
<= addr
&& addr
< second_addr
) {
607 errmsg
= "invalid destination";
610 GET_COMMAND_SUFFIX();
611 if (!isglobal
) clear_undo_stack();
612 if (move_lines(addr
) < 0)
616 if (check_addr_range(current_addr
, current_addr
) < 0)
618 GET_COMMAND_SUFFIX();
619 if (display_lines(first_addr
, second_addr
, gflag
| GNP
) < 0)
624 if (check_addr_range(current_addr
, current_addr
) < 0)
626 GET_COMMAND_SUFFIX();
627 if (display_lines(first_addr
, second_addr
, gflag
| GPR
) < 0)
633 errmsg
= "unexpected address";
636 GET_COMMAND_SUFFIX();
637 prompt
= prompt
? NULL
: optarg
? optarg
: dps
;
642 errmsg
= "unexpected address";
645 GET_COMMAND_SUFFIX();
646 gflag
= (modified
&& !scripted
&& c
== 'q') ? EMOD
: EOF
;
649 if (!isspace((unsigned char)*ibufp
)) {
650 errmsg
= "unexpected command suffix";
652 } else if (addr_cnt
== 0)
653 second_addr
= addr_last
;
654 if ((fnp
= get_filename()) == NULL
)
656 GET_COMMAND_SUFFIX();
657 if (!isglobal
) clear_undo_stack();
658 if (*old_filename
== '\0' && *fnp
!= '!')
659 strcpy(old_filename
, fnp
);
661 if (*fnp
== '\0' && *old_filename
== '\0') {
662 errmsg
= "no current filename";
666 if ((addr
= read_file(*fnp
? fnp
: old_filename
, second_addr
)) < 0)
668 else if (addr
&& addr
!= addr_last
)
689 case '0': case '1': case '2': case '3': case '4':
690 case '5': case '6': case '7': case '8': case '9':
691 STRTOL(sgnum
, ibufp
);
693 sgflag
&= ~GSG
; /* override GSG */
697 errmsg
= "invalid command suffix";
701 } while (sflags
&& *ibufp
!= '\n');
702 if (sflags
&& !pat
) {
703 errmsg
= "no previous substitution";
705 } else if (sflags
& SGG
)
706 sgnum
= 0; /* override numeric arg */
707 if (*ibufp
!= '\n' && *(ibufp
+ 1) == '\n') {
708 errmsg
= "invalid pattern delimiter";
713 if ((!sflags
|| (sflags
& SGR
)) &&
714 (tpat
= get_compiled_pattern()) == NULL
) {
717 } else if (tpat
!= pat
) {
723 patlock
= 1; /* reserve pattern */
726 if (!sflags
&& extract_subst_tail(&sgflag
, &sgnum
) < 0)
735 sgflag
^= GPR
, sgflag
&= ~(GLS
| GNP
);
739 sgflag
|= GPR
, ibufp
++;
742 sgflag
|= GLS
, ibufp
++;
745 sgflag
|= GNP
, ibufp
++;
751 if (check_addr_range(current_addr
, current_addr
) < 0)
753 GET_COMMAND_SUFFIX();
754 if (!isglobal
) clear_undo_stack();
755 if (search_and_replace(pat
, sgflag
, sgnum
) < 0)
759 if (check_addr_range(current_addr
, current_addr
) < 0)
761 GET_THIRD_ADDR(addr
);
762 GET_COMMAND_SUFFIX();
763 if (!isglobal
) clear_undo_stack();
764 if (copy_lines(addr
) < 0)
769 errmsg
= "unexpected address";
772 GET_COMMAND_SUFFIX();
773 if (pop_undo_stack() < 0)
778 if ((n
= *ibufp
) == 'q' || n
== 'Q') {
782 if (!isspace((unsigned char)*ibufp
)) {
783 errmsg
= "unexpected command suffix";
785 } else if ((fnp
= get_filename()) == NULL
)
787 if (addr_cnt
== 0 && !addr_last
)
788 first_addr
= second_addr
= 0;
789 else if (check_addr_range(1, addr_last
) < 0)
791 GET_COMMAND_SUFFIX();
792 if (*old_filename
== '\0' && *fnp
!= '!')
793 strcpy(old_filename
, fnp
);
795 if (*fnp
== '\0' && *old_filename
== '\0') {
796 errmsg
= "no current filename";
800 if ((addr
= write_file(*fnp
? fnp
: old_filename
,
801 (c
== 'W') ? "a" : "w", first_addr
, second_addr
)) < 0)
803 else if (addr
== addr_last
)
805 else if (modified
&& !scripted
&& n
== 'q')
810 errmsg
= "unexpected address";
813 GET_COMMAND_SUFFIX();
818 errmsg
= "crypt unavailable";
823 if (check_addr_range(first_addr
= 1, current_addr
+ 1) < 0)
825 if (check_addr_range(first_addr
= 1, current_addr
+ !isglobal
) < 0)
828 else if ('0' < *ibufp
&& *ibufp
<= '9')
830 GET_COMMAND_SUFFIX();
831 if (display_lines(second_addr
, min(addr_last
,
832 second_addr
+ rows
), gflag
) < 0)
837 GET_COMMAND_SUFFIX();
838 printf("%ld\n", addr_cnt
? second_addr
: addr_last
);
842 errmsg
= "unexpected address";
844 } else if ((sflags
= get_shell_command()) < 0)
846 GET_COMMAND_SUFFIX();
847 if (sflags
) printf("%s\n", shcmd
+ 1);
849 if (!scripted
) printf("!\n");
853 if (check_addr_range(first_addr
= 1, current_addr
+ 1) < 0
855 if (check_addr_range(first_addr
= 1, current_addr
+ !isglobal
) < 0
857 || display_lines(second_addr
, second_addr
, 0) < 0)
861 errmsg
= "unknown command";
868 /* check_addr_range: return status of address range check */
870 check_addr_range(long n
, long m
)
876 if (first_addr
> second_addr
|| 1 > first_addr
||
877 second_addr
> addr_last
) {
878 errmsg
= "invalid address";
885 /* get_matching_node_addr: return the address of the next line matching a
886 pattern in a given direction. wrap around begin/end of editor buffer if
889 get_matching_node_addr(pattern_t
*pat
, int dir
)
892 long n
= current_addr
;
895 if (!pat
) return ERR
;
897 if ((n
= dir
? INC_MOD(n
, addr_last
) : DEC_MOD(n
, addr_last
))) {
898 lp
= get_addressed_line_node(n
);
899 if ((s
= get_sbuf_line(lp
)) == NULL
)
902 NUL_TO_NEWLINE(s
, lp
->len
);
903 if (!regexec(pat
, s
, 0, NULL
, 0))
906 } while (n
!= current_addr
);
912 /* get_filename: return pointer to copy of filename in the command buffer */
916 static char *file
= NULL
;
917 static int filesz
= 0;
921 if (*ibufp
!= '\n') {
923 if (*ibufp
== '\n') {
924 errmsg
= "invalid filename";
926 } else if ((ibufp
= get_extended_line(&n
, 1)) == NULL
)
928 else if (*ibufp
== '!') {
930 if ((n
= get_shell_command()) < 0)
933 printf("%s\n", shcmd
+ 1);
935 } else if (n
> PATH_MAX
- 1) {
936 errmsg
= "filename too long";
941 else if (*old_filename
== '\0') {
942 errmsg
= "no current filename";
946 REALLOC(file
, filesz
, PATH_MAX
, NULL
);
947 for (n
= 0; *ibufp
!= '\n';)
948 file
[n
++] = *ibufp
++;
950 return is_legal_filename(file
) ? file
: NULL
;
954 /* get_shell_command: read a shell command from stdin; return substitution
957 get_shell_command(void)
959 static char *buf
= NULL
;
962 char *s
; /* substitution char pointer */
967 errmsg
= "shell access restricted";
969 } else if ((s
= ibufp
= get_extended_line(&j
, 1)) == NULL
)
971 REALLOC(buf
, n
, j
+ 1, ERR
);
972 buf
[i
++] = '!'; /* prefix command w/ bang */
973 while (*ibufp
!= '\n')
976 REALLOC(buf
, n
, i
+ 2, ERR
);
978 if (*ibufp
++ == '\\')
983 REALLOC(buf
, n
, i
+ 1, ERR
);
987 else if (shcmd
== NULL
|| *(shcmd
+ 1) == '\0')
989 else if (shcmd
== NULL
)
992 errmsg
= "no previous command";
995 REALLOC(buf
, n
, i
+ shcmdi
, ERR
);
996 for (s
= shcmd
+ 1; s
< shcmd
+ shcmdi
;)
1002 if (*old_filename
== '\0') {
1003 errmsg
= "no current filename";
1006 j
= strlen(s
= strip_escapes(old_filename
));
1007 REALLOC(buf
, n
, i
+ j
, ERR
);
1013 REALLOC(shcmd
, shcmdsz
, i
+ 1, ERR
);
1014 memcpy(shcmd
, buf
, i
);
1015 shcmd
[shcmdi
= i
] = '\0';
1016 return *s
== '!' || *s
== '%';
1020 /* append_lines: insert text from stdin to after line n; stop when either a
1021 single period is read or EOF; return status */
1023 append_lines(long n
)
1026 const char *lp
= ibuf
;
1030 for (current_addr
= n
;;) {
1032 if ((l
= get_tty_line()) < 0)
1034 else if (l
== 0 || ibuf
[l
- 1] != '\n') {
1039 } else if (*(lp
= ibufp
) == '\0')
1042 while (*ibufp
++ != '\n')
1046 if (l
== 2 && lp
[0] == '.' && lp
[1] == '\n') {
1052 if ((lp
= put_sbuf_line(lp
)) == NULL
) {
1056 up
->t
= get_addressed_line_node(current_addr
);
1057 else if ((up
= push_undo_stack(UADD
, current_addr
,
1058 current_addr
)) == NULL
) {
1062 } while (lp
!= eot
);
1070 /* join_lines: replace a range of lines with the joined text of those lines */
1072 join_lines(long from
, long to
)
1074 static char *buf
= NULL
;
1081 ep
= get_addressed_line_node(INC_MOD(to
, addr_last
));
1082 bp
= get_addressed_line_node(from
);
1083 for (; bp
!= ep
; bp
= bp
->q_forw
) {
1084 if ((s
= get_sbuf_line(bp
)) == NULL
)
1086 REALLOC(buf
, n
, size
+ bp
->len
, ERR
);
1087 memcpy(buf
+ size
, s
, bp
->len
);
1090 REALLOC(buf
, n
, size
+ 2, ERR
);
1091 memcpy(buf
+ size
, "\n", 2);
1092 if (delete_lines(from
, to
) < 0)
1094 current_addr
= from
- 1;
1096 if (put_sbuf_line(buf
) == NULL
||
1097 push_undo_stack(UADD
, current_addr
, current_addr
) == NULL
) {
1107 /* move_lines: move a range of lines */
1109 move_lines(long addr
)
1111 line_t
*b1
, *a1
, *b2
, *a2
;
1112 long n
= INC_MOD(second_addr
, addr_last
);
1113 long p
= first_addr
- 1;
1114 int done
= (addr
== first_addr
- 1 || addr
== second_addr
);
1118 a2
= get_addressed_line_node(n
);
1119 b2
= get_addressed_line_node(p
);
1120 current_addr
= second_addr
;
1121 } else if (push_undo_stack(UMOV
, p
, n
) == NULL
||
1122 push_undo_stack(UMOV
, addr
, INC_MOD(addr
, addr_last
)) == NULL
) {
1126 a1
= get_addressed_line_node(n
);
1127 if (addr
< first_addr
) {
1128 b1
= get_addressed_line_node(p
);
1129 b2
= get_addressed_line_node(addr
);
1130 /* this get_addressed_line_node last! */
1132 b2
= get_addressed_line_node(addr
);
1133 b1
= get_addressed_line_node(p
);
1134 /* this get_addressed_line_node last! */
1137 REQUE(b2
, b1
->q_forw
);
1138 REQUE(a1
->q_back
, a2
);
1140 current_addr
= addr
+ ((addr
< first_addr
) ?
1141 second_addr
- first_addr
+ 1 : 0);
1144 unset_active_nodes(b2
->q_forw
, a2
);
1151 /* copy_lines: copy a range of lines; return status */
1153 copy_lines(long addr
)
1155 line_t
*lp
, *np
= get_addressed_line_node(first_addr
);
1157 long n
= second_addr
- first_addr
+ 1;
1160 current_addr
= addr
;
1161 if (first_addr
<= addr
&& addr
< second_addr
) {
1162 n
= addr
- first_addr
+ 1;
1163 m
= second_addr
- addr
;
1165 for (; n
> 0; n
=m
, m
=0, np
= get_addressed_line_node(current_addr
+ 1))
1166 for (; n
-- > 0; np
= np
->q_forw
) {
1168 if ((lp
= dup_line_node(np
)) == NULL
) {
1175 else if ((up
= push_undo_stack(UADD
, current_addr
,
1176 current_addr
)) == NULL
) {
1187 /* delete_lines: delete a range of lines */
1189 delete_lines(long from
, long to
)
1194 if (push_undo_stack(UDEL
, from
, to
) == NULL
) {
1198 n
= get_addressed_line_node(INC_MOD(to
, addr_last
));
1199 p
= get_addressed_line_node(from
- 1);
1200 /* this get_addressed_line_node last! */
1202 unset_active_nodes(p
->q_forw
, n
);
1204 addr_last
-= to
- from
+ 1;
1205 current_addr
= from
- 1;
1212 /* display_lines: print a range of lines to stdout */
1214 display_lines(long from
, long to
, int gflag
)
1221 errmsg
= "invalid address";
1224 ep
= get_addressed_line_node(INC_MOD(to
, addr_last
));
1225 bp
= get_addressed_line_node(from
);
1226 for (; bp
!= ep
; bp
= bp
->q_forw
) {
1227 if ((s
= get_sbuf_line(bp
)) == NULL
)
1229 if (put_tty_line(s
, bp
->len
, current_addr
= from
++, gflag
) < 0)
1236 #define MAXMARK 26 /* max number of marks */
1238 static line_t
*mark
[MAXMARK
]; /* line markers */
1239 static int markno
; /* line marker count */
1241 /* mark_line_node: set a line node mark */
1243 mark_line_node(line_t
*lp
, int n
)
1245 if (!islower((unsigned char)n
)) {
1246 errmsg
= "invalid mark character";
1248 } else if (mark
[n
- 'a'] == NULL
)
1255 /* get_marked_node_addr: return address of a marked line */
1257 get_marked_node_addr(int n
)
1259 if (!islower((unsigned char)n
)) {
1260 errmsg
= "invalid mark character";
1263 return get_line_node_addr(mark
[n
- 'a']);
1267 /* unmark_line_node: clear line node mark */
1269 unmark_line_node(line_t
*lp
)
1273 for (i
= 0; markno
&& i
< MAXMARK
; i
++)
1274 if (mark
[i
] == lp
) {
1281 /* dup_line_node: return a pointer to a copy of a line node */
1283 dup_line_node(line_t
*lp
)
1287 if ((np
= (line_t
*) malloc(sizeof(line_t
))) == NULL
) {
1288 fprintf(stderr
, "%s\n", strerror(errno
));
1289 errmsg
= "out of memory";
1292 np
->seek
= lp
->seek
;
1298 /* has_trailing_escape: return the parity of escapes preceding a character
1301 has_trailing_escape(char *s
, char *t
)
1303 return (s
== t
|| *(t
- 1) != '\\') ? 0 : !has_trailing_escape(s
, t
- 1);
1307 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1309 strip_escapes(char *s
)
1311 static char *file
= NULL
;
1312 static int filesz
= 0;
1316 REALLOC(file
, filesz
, PATH_MAX
, NULL
);
1317 while (i
< filesz
- 1 /* Worry about a possible trailing escape */
1318 && (file
[i
++] = (*s
== '\\') ? *++s
: *s
))
1325 signal_hup(int signo
)
1328 sigflags
|= (1 << (signo
- 1));
1335 signal_int(int signo
)
1338 sigflags
|= (1 << (signo
- 1));
1345 handle_hup(int signo
)
1347 char *hup
= NULL
; /* hup filename */
1349 char ed_hup
[] = "ed.hup";
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 errmsg
= "shell access restricted";