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
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/* $OpenBSD: regex.c,v 1.1 2015/11/19 19:43:40 tedu Exp $ */
/** regex - regular expression functions related to POSIX regex lib. */
/* This file is part of flex. */
/* 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. */
/* Neither the name of the University nor the names of its contributors */
/* may be used to endorse or promote products derived from this software */
/* without specific prior written permission. */
/* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
/* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
/* PURPOSE. */
#include "flexdef.h"
static const char* REGEXP_LINEDIR = "^#line ([[:digit:]]+) \"(.*)\"";
static const char* REGEXP_BLANK_LINE = "^[[:space:]]*$";
regex_t regex_linedir; /**< matches line directives */
regex_t regex_blank_line; /**< matches blank lines */
/** Initialize the regular expressions.
* @return true upon success.
*/
bool flex_init_regex(void)
{
flex_regcomp(®ex_linedir, REGEXP_LINEDIR, REG_EXTENDED);
flex_regcomp(®ex_blank_line, REGEXP_BLANK_LINE, REG_EXTENDED);
return true;
}
/** Compiles a regular expression or dies trying.
* @param preg Same as for regcomp().
* @param regex Same as for regcomp().
* @param cflags Same as for regcomp().
*/
void flex_regcomp(regex_t *preg, const char *regex, int cflags)
{
int err;
memset (preg, 0, sizeof (regex_t));
if ((err = regcomp (preg, regex, cflags)) != 0) {
const int errbuf_sz = 200;
char *errbuf, *rxerr;
errbuf = (char*)flex_alloc(errbuf_sz *sizeof(char));
if (!errbuf)
flexfatal(_("Unable to allocate buffer to report regcomp"));
rxerr = (char*)flex_alloc(errbuf_sz *sizeof(char));
if (!rxerr)
flexfatal(_("Unable to allocate buffer for regerror"));
regerror (err, preg, rxerr, errbuf_sz);
snprintf (errbuf, errbuf_sz, "regcomp for \"%s\" failed: %s", regex, rxerr);
flexfatal (errbuf);
free(errbuf);
free(rxerr);
}
}
/** Extract a copy of the match, or NULL if no match.
* @param m A match as returned by regexec().
* @param src The source string that was passed to regexec().
* @return The allocated string.
*/
char *regmatch_dup (regmatch_t * m, const char *src)
{
char *str;
int len;
if (m == NULL || m->rm_so < 0)
return NULL;
len = m->rm_eo - m->rm_so;
str = (char *) flex_alloc ((len + 1) * sizeof (char));
if (!str)
flexfatal(_("Unable to allocate a copy of the match"));
strncpy (str, src + m->rm_so, len);
str[len] = 0;
return str;
}
/** Copy the match.
* @param m A match as returned by regexec().
* @param dest The destination buffer.
* @param src The source string that was passed to regexec().
* @return dest
*/
char *regmatch_cpy (regmatch_t * m, char *dest, const char *src)
{
if (m == NULL || m->rm_so < 0) {
if (dest)
dest[0] = '\0';
return dest;
}
snprintf (dest, regmatch_len(m), "%s", src + m->rm_so);
return dest;
}
/** Get the length in characters of the match.
* @param m A match as returned by regexec().
* @param src The source string that was passed to regexec().
* @return The length of the match.
*/
int regmatch_len (regmatch_t * m)
{
if (m == NULL || m->rm_so < 0) {
return 0;
}
return m->rm_eo - m->rm_so;
}
/** Convert a regmatch_t object to an integer using the strtol() function.
* @param m A match as returned by regexec().
* @param src The source string that was passed to regexec().
* @param endptr Same as the second argument to strtol().
* @param base Same as the third argument to strtol().
* @return The converted integer or error (Return value is the same as for strtol()).
*/
int regmatch_strtol (regmatch_t * m, const char *src, char **endptr,
int base)
{
int n = 0;
#define bufsz 20
char buf[bufsz];
char *s;
if (m == NULL || m->rm_so < 0)
return 0;
if (regmatch_len (m) < bufsz)
s = regmatch_cpy (m, buf, src);
else
s = regmatch_dup (m, src);
n = strtol (s, endptr, base);
if (s != buf)
free (s);
return n;
}
/** Check for empty or non-existent match.
* @param m A match as returned by regexec().
* @return false if match length is non-zero.
* Note that reg_empty returns true even if match did not occur at all.
*/
bool regmatch_empty (regmatch_t * m)
{
return (m == NULL || m->rm_so < 0 || m->rm_so == m->rm_eo);
}
/* vim:set expandtab cindent tabstop=4 softtabstop=4 shiftwidth=4 textwidth=0: */
|
