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     Original API code Copyright (c) 1997-2012 University of Cambridge
10         New API code Copyright (c) 2016 University of Cambridge
11
12-----------------------------------------------------------------------------
13Redistribution and use in source and binary forms, with or without
14modification, are permitted provided that the following conditions are met:
15
16    * Redistributions of source code must retain the above copyright notice,
17      this list of conditions and the following disclaimer.
18
19    * Redistributions in binary form must reproduce the above copyright
20      notice, this list of conditions and the following disclaimer in the
21      documentation and/or other materials provided with the distribution.
22
23    * Neither the name of the University of Cambridge nor the names of its
24      contributors may be used to endorse or promote products derived from
25      this software without specific prior written permission.
26
27THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
28AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
31LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37POSSIBILITY OF SUCH DAMAGE.
38-----------------------------------------------------------------------------
39*/
40
41
42/* This module contains the external function pcre2_maketables(), which builds
43character tables for PCRE2 in the current locale. The file is compiled on its
44own as part of the PCRE2 library. However, it is also included in the
45compilation of dftables.c, in which case the macro DFTABLES is defined. */
46
47#ifndef DFTABLES
48#  ifdef HAVE_CONFIG_H
49#  include "config.h"
50#  endif
51#  include "pcre2_internal.h"
52#endif
53
54
55
56/*************************************************
57*           Create PCRE2 character tables        *
58*************************************************/
59
60/* This function builds a set of character tables for use by PCRE2 and returns
61a pointer to them. They are build using the ctype functions, and consequently
62their contents will depend upon the current locale setting. When compiled as
63part of the library, the store is obtained via a general context malloc, if
64supplied, but when DFTABLES is defined (when compiling the dftables auxiliary
65program) malloc() is used, and the function has a different name so as not to
66clash with the prototype in pcre2.h.
67
68Arguments:   none when DFTABLES is defined
69             else a PCRE2 general context or NULL
70Returns:     pointer to the contiguous block of data
71*/
72
73#ifdef DFTABLES  /* Included in freestanding dftables.c program */
74static const uint8_t *maketables(void)
75{
76uint8_t *yield = (uint8_t *)malloc(tables_length);
77
78#else  /* Not DFTABLES, compiling the library */
79PCRE2_EXP_DEFN const uint8_t * PCRE2_CALL_CONVENTION
80pcre2_maketables(pcre2_general_context *gcontext)
81{
82uint8_t *yield = (uint8_t *)((gcontext != NULL)?
83  gcontext->memctl.malloc(tables_length, gcontext->memctl.memory_data) :
84  malloc(tables_length));
85#endif  /* DFTABLES */
86
87int i;
88uint8_t *p;
89
90if (yield == NULL) return NULL;
91p = yield;
92
93/* First comes the lower casing table */
94
95for (i = 0; i < 256; i++) *p++ = tolower(i);
96
97/* Next the case-flipping table */
98
99for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
100
101/* Then the character class tables. Don't try to be clever and save effort on
102exclusive ones - in some locales things may be different.
103
104Note that the table for "space" includes everything "isspace" gives, including
105VT in the default locale. This makes it work for the POSIX class [:space:].
106From release 8.34 is is also correct for Perl space, because Perl added VT at
107release 5.18.
108
109Note also that it is possible for a character to be alnum or alpha without
110being lower or upper, such as "male and female ordinals" (\xAA and \xBA) in the
111fr_FR locale (at least under Debian Linux's locales as of 12/2005). So we must
112test for alnum specially. */
113
114memset(p, 0, cbit_length);
115for (i = 0; i < 256; i++)
116  {
117  if (isdigit(i)) p[cbit_digit  + i/8] |= 1 << (i&7);
118  if (isupper(i)) p[cbit_upper  + i/8] |= 1 << (i&7);
119  if (islower(i)) p[cbit_lower  + i/8] |= 1 << (i&7);
120  if (isalnum(i)) p[cbit_word   + i/8] |= 1 << (i&7);
121  if (i == '_')   p[cbit_word   + i/8] |= 1 << (i&7);
122  if (isspace(i)) p[cbit_space  + i/8] |= 1 << (i&7);
123  if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7);
124  if (isgraph(i)) p[cbit_graph  + i/8] |= 1 << (i&7);
125  if (isprint(i)) p[cbit_print  + i/8] |= 1 << (i&7);
126  if (ispunct(i)) p[cbit_punct  + i/8] |= 1 << (i&7);
127  if (iscntrl(i)) p[cbit_cntrl  + i/8] |= 1 << (i&7);
128  }
129p += cbit_length;
130
131/* Finally, the character type table. In this, we used to exclude VT from the
132white space chars, because Perl didn't recognize it as such for \s and for
133comments within regexes. However, Perl changed at release 5.18, so PCRE changed
134at release 8.34. */
135
136for (i = 0; i < 256; i++)
137  {
138  int x = 0;
139  if (isspace(i)) x += ctype_space;
140  if (isalpha(i)) x += ctype_letter;
141  if (isdigit(i)) x += ctype_digit;
142  if (isxdigit(i)) x += ctype_xdigit;
143  if (isalnum(i) || i == '_') x += ctype_word;
144
145  /* Note: strchr includes the terminating zero in the characters it considers.
146  In this instance, that is ok because we want binary zero to be flagged as a
147  meta-character, which in this sense is any character that terminates a run
148  of data characters. */
149
150  if (strchr("\\*+?{^.$|()[", i) != 0) x += ctype_meta;
151  *p++ = x;
152  }
153
154return yield;
155}
156
157/* End of pcre2_maketables.c */
158