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 /* %ExternalCopyright% */
47
48 #ifndef DFTABLES
49 # ifdef HAVE_CONFIG_H
50 # include "config.h"
51 # endif
52 # include "pcre_internal.h"
53 #endif
54
55
56 /*************************************************
57 * Create PCRE character tables *
58 *************************************************/
59
60 /* This function builds a set of character tables for use by PCRE and returns
61 a pointer to them. They are build using the ctype functions, and consequently
62 their contents will depend upon the current locale setting. When compiled as
63 part of the library, the store is obtained via PUBL(malloc)(), but when
64 compiled inside dftables, use malloc().
65
66 Arguments: none
67 Returns: pointer to the contiguous block of data
68 */
69
70 #if defined COMPILE_PCRE8
71 #if defined(ERLANG_INTEGRATION)
72 const unsigned char *
erts_pcre_maketables(void)73 erts_pcre_maketables(void)
74 #else
75 const unsigned char *
76 pcre_maketables(void)
77 #endif
78 #elif defined COMPILE_PCRE16
79 const unsigned char *
80 pcre16_maketables(void)
81 #elif defined COMPILE_PCRE32
82 const unsigned char *
83 pcre32_maketables(void)
84 #endif
85 {
86 unsigned char *yield, *p;
87 int i;
88
89 #ifndef DFTABLES
90 yield = (unsigned char*)(PUBL(malloc))(tables_length);
91 #else
92 yield = (unsigned char*)malloc(tables_length);
93 #endif
94
95 if (yield == NULL) return NULL;
96 p = yield;
97
98 /* First comes the lower casing table */
99
100 for (i = 0; i < 256; i++) *p++ = tolower(i);
101
102 /* Next the case-flipping table */
103
104 for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
105
106 /* Then the character class tables. Don't try to be clever and save effort on
107 exclusive ones - in some locales things may be different.
108
109 Note that the table for "space" includes everything "isspace" gives, including
110 VT in the default locale. This makes it work for the POSIX class [:space:].
111 From release 8.34 is is also correct for Perl space, because Perl added VT at
112 release 5.18.
113
114 Note also that it is possible for a character to be alnum or alpha without
115 being lower or upper, such as "male and female ordinals" (\xAA and \xBA) in the
116 fr_FR locale (at least under Debian Linux's locales as of 12/2005). So we must
117 test for alnum specially. */
118
119 memset(p, 0, cbit_length);
120 for (i = 0; i < 256; i++)
121 {
122 if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
123 if (isupper(i)) p[cbit_upper + i/8] |= 1 << (i&7);
124 if (islower(i)) p[cbit_lower + i/8] |= 1 << (i&7);
125 if (isalnum(i)) p[cbit_word + i/8] |= 1 << (i&7);
126 if (i == '_') p[cbit_word + i/8] |= 1 << (i&7);
127 if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
128 if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7);
129 if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7);
130 if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7);
131 if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7);
132 if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7);
133 }
134 p += cbit_length;
135
136 /* Finally, the character type table. In this, we used to exclude VT from the
137 white space chars, because Perl didn't recognize it as such for \s and for
138 comments within regexes. However, Perl changed at release 5.18, so PCRE changed
139 at release 8.34. */
140
141 for (i = 0; i < 256; i++)
142 {
143 int x = 0;
144 if (isspace(i)) x += ctype_space;
145 if (isalpha(i)) x += ctype_letter;
146 if (isdigit(i)) x += ctype_digit;
147 if (isxdigit(i)) x += ctype_xdigit;
148 if (isalnum(i) || i == '_') x += ctype_word;
149
150 /* Note: strchr includes the terminating zero in the characters it considers.
151 In this instance, that is ok because we want binary zero to be flagged as a
152 meta-character, which in this sense is any character that terminates a run
153 of data characters. */
154
155 if (strchr("\\*+?{^.$|()[", i) != 0) x += ctype_meta;
156 *p++ = x;
157 }
158
159 return yield;
160 }
161
162 /* End of pcre_maketables.c */
163