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) 1997-2012 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#pragma warning( disable : 4244) // conversion from 'int' to 'unsigned short', possible loss of data
47
48#ifndef DFTABLES
49# include "pcre_config.h"
50# include "pcre_internal.h"
51#endif
52
53
54/*************************************************
55* Create PCRE character tables *
56*************************************************/
57
58/* This function builds a set of character tables for use by PCRE and returns
59a pointer to them. They are build using the ctype functions, and consequently
60their contents will depend upon the current locale setting. When compiled as
61part of the library, the store is obtained via PUBL(malloc)(), but when
62compiled inside dftables, use malloc().
63
64Arguments: none
65Returns: pointer to the contiguous block of data
66*/
67
68#if defined COMPILE_PCRE8
69const unsigned char *
70pcre_maketables(void)
71#elif defined COMPILE_PCRE16
72const unsigned char *
73pcre16_maketables(void)
74#elif defined COMPILE_PCRE32
75const unsigned char *
76pcre32_maketables(void)
77#endif
78{
79unsigned char *yield, *p;
80int i;
81
82#ifndef DFTABLES
83yield = (unsigned char*)(PUBL(malloc))(tables_length);
84#else
85yield = (unsigned char*)malloc(tables_length);
86#endif
87
88if (yield == NULL) return NULL;
89p = yield;
90
91/* First comes the lower casing table */
92
93for (i = 0; i < 256; i++) *p++ = tolower(i);
94
95/* Next the case-flipping table */
96
97for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
98
99/* Then the character class tables. Don't try to be clever and save effort on
100exclusive ones - in some locales things may be different.
101
102Note that the table for "space" includes everything "isspace" gives, including
103VT in the default locale. This makes it work for the POSIX class [:space:].
104From release 8.34 is is also correct for Perl space, because Perl added VT at
105release 5.18.
106
107Note also that it is possible for a character to be alnum or alpha without
108being lower or upper, such as "male and female ordinals" (\xAA and \xBA) in the
109fr_FR locale (at least under Debian Linux's locales as of 12/2005). So we must
110test for alnum specially. */
111
112memset(p, 0, cbit_length);
113for (i = 0; i < 256; i++)
114 {
115 if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
116 if (isupper(i)) p[cbit_upper + i/8] |= 1 << (i&7);
117 if (islower(i)) p[cbit_lower + i/8] |= 1 << (i&7);
118 if (isalnum(i)) p[cbit_word + i/8] |= 1 << (i&7);
119 if (i == '_') p[cbit_word + i/8] |= 1 << (i&7);
120 if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
121 if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7);
122 if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7);
123 if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7);
124 if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7);
125 if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7);
126 }
127p += cbit_length;
128
129/* Finally, the character type table. In this, we used to exclude VT from the
130white space chars, because Perl didn't recognize it as such for \s and for
131comments within regexes. However, Perl changed at release 5.18, so PCRE changed
132at release 8.34. */
133
134for (i = 0; i < 256; i++)
135 {
136 int x = 0;
137 if (isspace(i)) x += ctype_space;
138 if (isalpha(i)) x += ctype_letter;
139 if (isdigit(i)) x += ctype_digit;
140 if (isxdigit(i)) x += ctype_xdigit;
141 if (isalnum(i) || i == '_') x += ctype_word;
142
143 /* Note: strchr includes the terminating zero in the characters it considers.
144 In this instance, that is ok because we want binary zero to be flagged as a
145 meta-character, which in this sense is any character that terminates a run
146 of data characters. */
147
148 if (strchr("\\*+?{^.$|()[", i) != 0) x += ctype_meta;
149 *p++ = x;
150 }
151
152return yield;
153}
154
155/* End of pcre_maketables.c */
156