/[pcre]/code/trunk/pcre_maketables.c
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Contents of /code/trunk/pcre_maketables.c

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Revision 836 - (show annotations) (download)
Wed Dec 28 17:16:11 2011 UTC (2 years, 8 months ago) by ph10
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File size: 5600 byte(s)
Merging all the changes from the pcre16 branch into the trunk.

1 /*************************************************
2 * Perl-Compatible Regular Expressions *
3 *************************************************/
4
5 /* PCRE is a library of functions to support regular expressions whose syntax
6 and semantics are as close as possible to those of the Perl 5 language.
7
8 Written by Philip Hazel
9 Copyright (c) 1997-2012 University of Cambridge
10
11 -----------------------------------------------------------------------------
12 Redistribution and use in source and binary forms, with or without
13 modification, 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
26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 POSSIBILITY OF SUCH DAMAGE.
37 -----------------------------------------------------------------------------
38 */
39
40
41 /* This module contains the external function pcre_maketables(), which builds
42 character tables for PCRE in the current locale. The file is compiled on its
43 own as part of the PCRE library. However, it is also included in the
44 compilation of dftables.c, in which case the macro DFTABLES is defined. */
45
46
47 #ifndef DFTABLES
48 # ifdef HAVE_CONFIG_H
49 # include "config.h"
50 # endif
51 # include "pcre_internal.h"
52 #endif
53
54
55 /*************************************************
56 * Create PCRE character tables *
57 *************************************************/
58
59 /* This function builds a set of character tables for use by PCRE and returns
60 a pointer to them. They are build using the ctype functions, and consequently
61 their contents will depend upon the current locale setting. When compiled as
62 part of the library, the store is obtained via PUBL(malloc)(), but when
63 compiled inside dftables, use malloc().
64
65 Arguments: none
66 Returns: pointer to the contiguous block of data
67 */
68
69 #ifdef COMPILE_PCRE8
70 const unsigned char *
71 pcre_maketables(void)
72 #else
73 const unsigned char *
74 pcre16_maketables(void)
75 #endif
76 {
77 unsigned char *yield, *p;
78 int i;
79
80 #ifndef DFTABLES
81 yield = (unsigned char*)(PUBL(malloc))(tables_length);
82 #else
83 yield = (unsigned char*)malloc(tables_length);
84 #endif
85
86 if (yield == NULL) return NULL;
87 p = yield;
88
89 /* First comes the lower casing table */
90
91 for (i = 0; i < 256; i++) *p++ = tolower(i);
92
93 /* Next the case-flipping table */
94
95 for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
96
97 /* Then the character class tables. Don't try to be clever and save effort on
98 exclusive ones - in some locales things may be different. Note that the table
99 for "space" includes everything "isspace" gives, including VT in the default
100 locale. This makes it work for the POSIX class [:space:]. Note also that it is
101 possible for a character to be alnum or alpha without being lower or upper,
102 such as "male and female ordinals" (\xAA and \xBA) in the fr_FR locale (at
103 least under Debian Linux's locales as of 12/2005). So we must test for alnum
104 specially. */
105
106 memset(p, 0, cbit_length);
107 for (i = 0; i < 256; i++)
108 {
109 if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
110 if (isupper(i)) p[cbit_upper + i/8] |= 1 << (i&7);
111 if (islower(i)) p[cbit_lower + i/8] |= 1 << (i&7);
112 if (isalnum(i)) p[cbit_word + i/8] |= 1 << (i&7);
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;
142 *p++ = x;
143 }
144
145 return yield;
146 }
147
148 /* End of pcre_maketables.c */

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