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

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Revision 236 - (show annotations) (download)
Tue Sep 11 12:57:06 2007 UTC (6 years, 7 months ago) by ph10
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File size: 5518 byte(s)
<config.h> => "config.h" and also some cases of <pcre.h>.

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) 1997-2007 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 pcre_malloc(), but when compiled
63 inside dftables, use malloc().
64
65 Arguments: none
66 Returns: pointer to the contiguous block of data
67 */
68
69 const unsigned char *
70 pcre_maketables(void)
71 {
72 unsigned char *yield, *p;
73 int i;
74
75 #ifndef DFTABLES
76 yield = (unsigned char*)(pcre_malloc)(tables_length);
77 #else
78 yield = (unsigned char*)malloc(tables_length);
79 #endif
80
81 if (yield == NULL) return NULL;
82 p = yield;
83
84 /* First comes the lower casing table */
85
86 for (i = 0; i < 256; i++) *p++ = tolower(i);
87
88 /* Next the case-flipping table */
89
90 for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
91
92 /* Then the character class tables. Don't try to be clever and save effort on
93 exclusive ones - in some locales things may be different. Note that the table
94 for "space" includes everything "isspace" gives, including VT in the default
95 locale. This makes it work for the POSIX class [:space:]. Note also that it is
96 possible for a character to be alnum or alpha without being lower or upper,
97 such as "male and female ordinals" (\xAA and \xBA) in the fr_FR locale (at
98 least under Debian Linux's locales as of 12/2005). So we must test for alnum
99 specially. */
100
101 memset(p, 0, cbit_length);
102 for (i = 0; i < 256; i++)
103 {
104 if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
105 if (isupper(i)) p[cbit_upper + i/8] |= 1 << (i&7);
106 if (islower(i)) p[cbit_lower + i/8] |= 1 << (i&7);
107 if (isalnum(i)) p[cbit_word + i/8] |= 1 << (i&7);
108 if (i == '_') p[cbit_word + i/8] |= 1 << (i&7);
109 if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
110 if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7);
111 if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7);
112 if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7);
113 if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7);
114 if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7);
115 }
116 p += cbit_length;
117
118 /* Finally, the character type table. In this, we exclude VT from the white
119 space chars, because Perl doesn't recognize it as such for \s and for comments
120 within regexes. */
121
122 for (i = 0; i < 256; i++)
123 {
124 int x = 0;
125 if (i != 0x0b && isspace(i)) x += ctype_space;
126 if (isalpha(i)) x += ctype_letter;
127 if (isdigit(i)) x += ctype_digit;
128 if (isxdigit(i)) x += ctype_xdigit;
129 if (isalnum(i) || i == '_') x += ctype_word;
130
131 /* Note: strchr includes the terminating zero in the characters it considers.
132 In this instance, that is ok because we want binary zero to be flagged as a
133 meta-character, which in this sense is any character that terminates a run
134 of data characters. */
135
136 if (strchr("\\*+?{^.$|()[", i) != 0) x += ctype_meta;
137 *p++ = x;
138 }
139
140 return yield;
141 }
142
143 /* End of pcre_maketables.c */

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