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