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 # include "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
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 PUBL(malloc)(), but when
61 compiled inside dftables, use malloc().
62
63 Arguments: none
64 Returns: pointer to the contiguous block of data
65 */
66
67 #if defined COMPILE_PCRE8
68 const unsigned char *
pcre_maketables(void)69 pcre_maketables(void)
70 #elif defined COMPILE_PCRE16
71 const unsigned char *
72 pcre16_maketables(void)
73 #elif defined COMPILE_PCRE32
74 const unsigned char *
75 pcre32_maketables(void)
76 #endif
77 {
78 unsigned char *yield, *p;
79 int i;
80
81 #ifndef DFTABLES
82 yield = (unsigned char*)(PUBL(malloc))(tables_length);
83 #else
84 yield = (unsigned char*)malloc(tables_length);
85 #endif
86
87 if (yield == NULL) return NULL;
88 p = yield;
89
90 /* First comes the lower casing table */
91
92 for (i = 0; i < 256; i++) *p++ = tolower(i);
93
94 /* Next the case-flipping table */
95
96 for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
97
98 /* Then the character class tables. Don't try to be clever and save effort on
99 exclusive ones - in some locales things may be different.
100
101 Note that the table for "space" includes everything "isspace" gives, including
102 VT in the default locale. This makes it work for the POSIX class [:space:].
103 From release 8.34 is is also correct for Perl space, because Perl added VT at
104 release 5.18.
105
106 Note also that it is possible for a character to be alnum or alpha without
107 being lower or upper, such as "male and female ordinals" (\xAA and \xBA) in the
108 fr_FR locale (at least under Debian Linux's locales as of 12/2005). So we must
109 test for alnum specially. */
110
111 memset(p, 0, cbit_length);
112 for (i = 0; i < 256; i++)
113 {
114 if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
115 if (isupper(i)) p[cbit_upper + i/8] |= 1 << (i&7);
116 if (islower(i)) p[cbit_lower + i/8] |= 1 << (i&7);
117 if (isalnum(i)) p[cbit_word + i/8] |= 1 << (i&7);
118 if (i == '_') p[cbit_word + i/8] |= 1 << (i&7);
119 if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
120 if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7);
121 if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7);
122 if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7);
123 if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7);
124 if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7);
125 }
126 p += cbit_length;
127
128 /* Finally, the character type table. In this, we used to exclude VT from the
129 white space chars, because Perl didn't recognize it as such for \s and for
130 comments within regexes. However, Perl changed at release 5.18, so PCRE changed
131 at release 8.34. */
132
133 for (i = 0; i < 256; i++)
134 {
135 int x = 0;
136 if (isspace(i)) x += ctype_space;
137 if (isalpha(i)) x += ctype_letter;
138 if (isdigit(i)) x += ctype_digit;
139 if (isxdigit(i)) x += ctype_xdigit;
140 if (isalnum(i) || i == '_') x += ctype_word;
141
142 /* Note: strchr includes the terminating zero in the characters it considers.
143 In this instance, that is ok because we want binary zero to be flagged as a
144 meta-character, which in this sense is any character that terminates a run
145 of data characters. */
146
147 if (strchr("\\*+?{^.$|()[", i) != 0) x += ctype_meta;
148 *p++ = x;
149 }
150
151 return yield;
152 }
153
154 /* End of pcre_maketables.c */
155
