1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/* re.c: This file contains the regular expression interface routines for
the ed line editor. */
/*-
* Copyright (c) 1993 Andrew Moore, Talke Studio.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "ed.h"
const char *errmsg = "";
/* get_compiled_pattern: return pointer to compiled pattern from command
buffer */
pattern_t *
get_compiled_pattern(void)
{
static pattern_t *expr = NULL;
static char error[1024];
char *exprs;
char delimiter;
int n;
if ((delimiter = *ibufp) == ' ') {
errmsg = "invalid pattern delimiter";
return NULL;
} else if (delimiter == '\n' || *++ibufp == '\n' || *ibufp == delimiter) {
if (!expr)
errmsg = "no previous pattern";
return expr;
} else if ((exprs = extract_pattern(delimiter)) == NULL)
return NULL;
/* buffer alloc'd && not reserved */
if (expr && !patlock)
regfree(expr);
else if ((expr = (pattern_t *) malloc(sizeof(pattern_t))) == NULL) {
fprintf(stderr, "%s\n", strerror(errno));
errmsg = "out of memory";
return NULL;
}
patlock = 0;
if ((n = regcomp(expr, exprs, 0))) {
regerror(n, expr, error, sizeof error);
errmsg = error;
free(expr);
return expr = NULL;
}
return expr;
}
/* extract_pattern: copy a pattern string from the command buffer; return
pointer to the copy */
char *
extract_pattern(int delimiter)
{
static char *lhbuf = NULL; /* buffer */
static int lhbufsz = 0; /* buffer size */
char *nd;
int len;
for (nd = ibufp; *nd != delimiter && *nd != '\n'; nd++)
switch (*nd) {
default:
break;
case '[':
if ((nd = parse_char_class(++nd)) == NULL) {
errmsg = "unbalanced brackets ([])";
return NULL;
}
break;
case '\\':
if (*++nd == '\n') {
errmsg = "trailing backslash (\\)";
return NULL;
}
break;
}
len = nd - ibufp;
REALLOC(lhbuf, lhbufsz, len + 1, NULL);
memcpy(lhbuf, ibufp, len);
lhbuf[len] = '\0';
ibufp = nd;
return (isbinary) ? NUL_TO_NEWLINE(lhbuf, len) : lhbuf;
}
/* parse_char_class: expand a POSIX character class */
char *
parse_char_class(char *s)
{
int c, d;
if (*s == '^')
s++;
if (*s == ']')
s++;
for (; *s != ']' && *s != '\n'; s++)
if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '='))
for (s++, c = *++s; *s != ']' || c != d; s++)
if ((c = *s) == '\n')
return NULL;
return (*s == ']') ? s : NULL;
}
|
