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) 1997-2008 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
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
60a pointer to them. They are build using the ctype functions, and consequently
61their contents will depend upon the current locale setting. When compiled as
62part of the library, the store is obtained via pcre_malloc(), but when compiled
63inside dftables, use malloc().
64
65Arguments:   none
66Returns:     pointer to the contiguous block of data
67*/
68
69const unsigned char *
70pcre_maketables(void)
71{
72unsigned char *yield, *p;
73int i;
74
75#ifndef DFTABLES
76yield = (unsigned char*)(pcre_malloc)(tables_length);
77#else
78yield = (unsigned char*)malloc(tables_length);
79#endif
80
81if (yield == NULL) return NULL;
82p = yield;
83
84/* First comes the lower casing table */
85
86for (i = 0; i < 256; i++) *p++ = tolower(i);
87
88/* Next the case-flipping table */
89
90for (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
93exclusive ones - in some locales things may be different. Note that the table
94for "space" includes everything "isspace" gives, including VT in the default
95locale. This makes it work for the POSIX class [:space:]. Note also that it is
96possible for a character to be alnum or alpha without being lower or upper,
97such as "male and female ordinals" (\xAA and \xBA) in the fr_FR locale (at
98least under Debian Linux's locales as of 12/2005). So we must test for alnum
99specially. */
100
101memset(p, 0, cbit_length);
102for (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  }
116p += cbit_length;
117
118/* Finally, the character type table. In this, we exclude VT from the white
119space chars, because Perl doesn't recognize it as such for \s and for comments
120within regexes. */
121
122for (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
140return yield;
141}
142
143/* End of pcre_maketables.c */
144