Commit | Line | Data |
---|---|---|
c86f6258 PH |
1 | /************************************************* |
2 | * Perl-Compatible Regular Expressions * | |
3 | *************************************************/ | |
4 | ||
5 | /* | |
6 | PCRE is a library of functions to support regular expressions whose syntax | |
7 | and semantics are as close as possible to those of the Perl 5 language. | |
8 | ||
9 | Written by: Philip Hazel <ph10@cam.ac.uk> | |
10 | ||
11 | Copyright (c) 1997-2003 University of Cambridge | |
12 | ||
13 | ----------------------------------------------------------------------------- | |
14 | Redistribution and use in source and binary forms, with or without | |
15 | modification, are permitted provided that the following conditions are met: | |
16 | ||
17 | * Redistributions of source code must retain the above copyright notice, | |
18 | this list of conditions and the following disclaimer. | |
19 | ||
20 | * Redistributions in binary form must reproduce the above copyright | |
21 | notice, this list of conditions and the following disclaimer in the | |
22 | documentation and/or other materials provided with the distribution. | |
23 | ||
24 | * Neither the name of the University of Cambridge nor the names of its | |
25 | contributors may be used to endorse or promote products derived from | |
26 | this software without specific prior written permission. | |
27 | ||
28 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
29 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
30 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
31 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
32 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
33 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
34 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
35 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
36 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
37 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
38 | POSSIBILITY OF SUCH DAMAGE. | |
39 | ----------------------------------------------------------------------------- | |
40 | */ | |
41 | ||
42 | ||
43 | /* This file is compiled on its own as part of the PCRE library. However, | |
44 | it is also included in the compilation of dftables.c, in which case the macro | |
45 | DFTABLES is defined. */ | |
46 | ||
47 | #ifndef DFTABLES | |
48 | #include "internal.h" | |
49 | #endif | |
50 | ||
51 | ||
52 | ||
53 | /************************************************* | |
54 | * Create PCRE character tables * | |
55 | *************************************************/ | |
56 | ||
57 | /* This function builds a set of character tables for use by PCRE and returns | |
58 | a pointer to them. They are build using the ctype functions, and consequently | |
59 | their contents will depend upon the current locale setting. When compiled as | |
60 | part of the library, the store is obtained via pcre_malloc(), but when compiled | |
61 | inside dftables, use malloc(). | |
62 | ||
63 | Arguments: none | |
64 | Returns: pointer to the contiguous block of data | |
65 | */ | |
66 | ||
67 | const unsigned char * | |
68 | pcre_maketables(void) | |
69 | { | |
70 | unsigned char *yield, *p; | |
71 | int i; | |
72 | ||
73 | #ifndef DFTABLES | |
74 | yield = (unsigned char*)(pcre_malloc)(tables_length); | |
75 | #else | |
76 | yield = (unsigned char*)malloc(tables_length); | |
77 | #endif | |
78 | ||
79 | if (yield == NULL) return NULL; | |
80 | p = yield; | |
81 | ||
82 | /* First comes the lower casing table */ | |
83 | ||
84 | for (i = 0; i < 256; i++) *p++ = tolower(i); | |
85 | ||
86 | /* Next the case-flipping table */ | |
87 | ||
88 | for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i); | |
89 | ||
90 | /* Then the character class tables. Don't try to be clever and save effort | |
91 | on exclusive ones - in some locales things may be different. Note that the | |
92 | table for "space" includes everything "isspace" gives, including VT in the | |
93 | default locale. This makes it work for the POSIX class [:space:]. */ | |
94 | ||
95 | memset(p, 0, cbit_length); | |
96 | for (i = 0; i < 256; i++) | |
97 | { | |
98 | if (isdigit(i)) | |
99 | { | |
100 | p[cbit_digit + i/8] |= 1 << (i&7); | |
101 | p[cbit_word + i/8] |= 1 << (i&7); | |
102 | } | |
103 | if (isupper(i)) | |
104 | { | |
105 | p[cbit_upper + i/8] |= 1 << (i&7); | |
106 | p[cbit_word + i/8] |= 1 << (i&7); | |
107 | } | |
108 | if (islower(i)) | |
109 | { | |
110 | p[cbit_lower + i/8] |= 1 << (i&7); | |
111 | p[cbit_word + i/8] |= 1 << (i&7); | |
112 | } | |
113 | if (i == '_') p[cbit_word + i/8] |= 1 << (i&7); | |
114 | if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7); | |
115 | if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7); | |
116 | if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7); | |
117 | if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7); | |
118 | if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7); | |
119 | if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7); | |
120 | } | |
121 | p += cbit_length; | |
122 | ||
123 | /* Finally, the character type table. In this, we exclude VT from the white | |
124 | space chars, because Perl doesn't recognize it as such for \s and for comments | |
125 | within regexes. */ | |
126 | ||
127 | for (i = 0; i < 256; i++) | |
128 | { | |
129 | int x = 0; | |
130 | if (i != 0x0b && isspace(i)) x += ctype_space; | |
131 | if (isalpha(i)) x += ctype_letter; | |
132 | if (isdigit(i)) x += ctype_digit; | |
133 | if (isxdigit(i)) x += ctype_xdigit; | |
134 | if (isalnum(i) || i == '_') x += ctype_word; | |
135 | ||
136 | /* Note: strchr includes the terminating zero in the characters it considers. | |
137 | In this instance, that is ok because we want binary zero to be flagged as a | |
138 | meta-character, which in this sense is any character that terminates a run | |
139 | of data characters. */ | |
140 | ||
141 | if (strchr("*+?{^.$|()[", i) != 0) x += ctype_meta; *p++ = x; } | |
142 | ||
143 | return yield; | |
144 | } | |
145 | ||
146 | /* End of maketables.c */ |