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Root/pcre/pcre_maketables.c

1/*************************************************
2* Perl-Compatible Regular Expressions *
3*************************************************/
4
5/* PCRE is a library of functions to support regular expressions whose syntax
6and semantics are as close as possible to those of the Perl 5 language.
7
8 Written by Philip Hazel
9 Copyright (c) 1997-2008 University of Cambridge
10
11-----------------------------------------------------------------------------
12Redistribution and use in source and binary forms, with or without
13modification, are permitted provided that the following conditions are met:
14
15 * Redistributions of source code must retain the above copyright notice,
16 this list of conditions and the following disclaimer.
17
18 * Redistributions in binary form must reproduce the above copyright
19 notice, this list of conditions and the following disclaimer in the
20 documentation and/or other materials provided with the distribution.
21
22 * Neither the name of the University of Cambridge nor the names of its
23 contributors may be used to endorse or promote products derived from
24 this software without specific prior written permission.
25
26THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36POSSIBILITY OF SUCH DAMAGE.
37-----------------------------------------------------------------------------
38*/
39
40
41/* This module contains the external function pcre_maketables(), which builds
42character tables for PCRE in the current locale. The file is compiled on its
43own as part of the PCRE library. However, it is also included in the
44compilation of dftables.c, in which case the macro DFTABLES is defined. */
45
46
47#ifndef DFTABLES
48# include "pcre_config.h"
49# include "pcre_internal.h"
50#endif
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
58a pointer to them. They are build using the ctype functions, and consequently
59their contents will depend upon the current locale setting. When compiled as
60part of the library, the store is obtained via pcre_malloc(), but when compiled
61inside dftables, use malloc().
62
63Arguments: none
64Returns: pointer to the contiguous block of data
65*/
66
67const unsigned char *
68pcre_maketables(void)
69{
70unsigned char *yield, *p;
71int i;
72
73#ifndef DFTABLES
74yield = (unsigned char*)(pcre_malloc)(tables_length);
75#else
76yield = (unsigned char*)malloc(tables_length);
77#endif
78
79if (yield == NULL) return NULL;
80p = yield;
81
82/* First comes the lower casing table */
83
84for (i = 0; i < 256; i++) *p++ = tolower(i);
85
86/* Next the case-flipping table */
87
88for (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 on
91exclusive ones - in some locales things may be different. Note that the table
92for "space" includes everything "isspace" gives, including VT in the default
93locale. This makes it work for the POSIX class [:space:]. Note also that it is
94possible for a character to be alnum or alpha without being lower or upper,
95such as "male and female ordinals" (\xAA and \xBA) in the fr_FR locale (at
96least under Debian Linux's locales as of 12/2005). So we must test for alnum
97specially. */
98
99memset(p, 0, cbit_length);
100for (i = 0; i < 256; i++)
101 {
102 if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
103 if (isupper(i)) p[cbit_upper + i/8] |= 1 << (i&7);
104 if (islower(i)) p[cbit_lower + i/8] |= 1 << (i&7);
105 if (isalnum(i)) p[cbit_word + i/8] |= 1 << (i&7);
106 if (i == '_') p[cbit_word + i/8] |= 1 << (i&7);
107 if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
108 if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7);
109 if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7);
110 if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7);
111 if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7);
112 if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7);
113 }
114p += cbit_length;
115
116/* Finally, the character type table. In this, we exclude VT from the white
117space chars, because Perl doesn't recognize it as such for \s and for comments
118within regexes. */
119
120for (i = 0; i < 256; i++)
121 {
122 int x = 0;
123 if (i != 0x0b && isspace(i)) x += ctype_space;
124 if (isalpha(i)) x += ctype_letter;
125 if (isdigit(i)) x += ctype_digit;
126 if (isxdigit(i)) x += ctype_xdigit;
127 if (isalnum(i) || i == '_') x += ctype_word;
128
129 /* Note: strchr includes the terminating zero in the characters it considers.
130 In this instance, that is ok because we want binary zero to be flagged as a
131 meta-character, which in this sense is any character that terminates a run
132 of data characters. */
133
134 if (strchr("\\*+?{^.$|()[", i) != 0) x += ctype_meta;
135 *p++ = x;
136 }
137
138return yield;
139}
140
141/* End of pcre_maketables.c */

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