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 Original API code Copyright (c) 1997-2012 University of Cambridge
10 New API code Copyright (c) 2016-2020 University of Cambridge
11
12 -----------------------------------------------------------------------------
13 Redistribution and use in source and binary forms, with or without
14 modification, 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
27 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
28 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
31 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 POSSIBILITY OF SUCH DAMAGE.
38 -----------------------------------------------------------------------------
39 */
40
41
42 /* This module contains the external function pcre2_maketables(), which builds
43 character tables for PCRE2 in the current locale. The file is compiled on its
44 own as part of the PCRE2 library. It is also included in the compilation of
45 pcre2_dftables.c as a freestanding program, in which case the macro
46 PCRE2_DFTABLES is defined. */
47
48 #ifndef PCRE2_DFTABLES /* Compiling the library */
49 # ifdef HAVE_CONFIG_H
50 # include "config.h"
51 # endif
52 # include "pcre2_internal.h"
53 #endif
54
55 /*************************************************
56 * Create PCRE2 character tables *
57 *************************************************/
58
59 /* This function builds a set of character tables for use by PCRE2 and returns
60 a pointer to them. They are build using the ctype functions, and consequently
61 their contents will depend upon the current locale setting. When compiled as
62 part of the library, the store is obtained via a general context malloc, if
63 supplied, but when PCRE2_DFTABLES is defined (when compiling the pcre2_dftables
64 freestanding auxiliary program) malloc() is used, and the function has a
65 different name so as not to clash with the prototype in pcre2.h.
66
67 Arguments: none when PCRE2_DFTABLES is defined
68 else a PCRE2 general context or NULL
69 Returns: pointer to the contiguous block of data
70 else NULL if memory allocation failed
71 */
72
73 #ifdef PCRE2_DFTABLES /* Included in freestanding pcre2_dftables program */
maketables(void)74 static const uint8_t *maketables(void)
75 {
76 uint8_t *yield = (uint8_t *)malloc(TABLES_LENGTH);
77
78 #else /* Not PCRE2_DFTABLES, that is, compiling the library */
79 PCRE2_EXP_DEFN const uint8_t * PCRE2_CALL_CONVENTION
80 pcre2_maketables(pcre2_general_context *gcontext)
81 {
82 uint8_t *yield = (uint8_t *)((gcontext != NULL)?
83 gcontext->memctl.malloc(TABLES_LENGTH, gcontext->memctl.memory_data) :
84 malloc(TABLES_LENGTH));
85 #endif /* PCRE2_DFTABLES */
86
87 int i;
88 uint8_t *p;
89
90 if (yield == NULL) return NULL;
91 p = yield;
92
93 /* First comes the lower casing table */
94
95 for (i = 0; i < 256; i++) *p++ = tolower(i);
96
97 /* Next the case-flipping table */
98
99 for (i = 0; i < 256; i++)
100 {
101 int c = islower(i)? toupper(i) : tolower(i);
102 *p++ = (c < 256)? c : i;
103 }
104
105 /* Then the character class tables. Don't try to be clever and save effort on
106 exclusive ones - in some locales things may be different.
107
108 Note that the table for "space" includes everything "isspace" gives, including
109 VT in the default locale. This makes it work for the POSIX class [:space:].
110 From PCRE1 release 8.34 and for all PCRE2 releases it is also correct for Perl
111 space, because Perl added VT at release 5.18.
112
113 Note also that it is possible for a character to be alnum or alpha without
114 being lower or upper, such as "male and female ordinals" (\xAA and \xBA) in the
115 fr_FR locale (at least under Debian Linux's locales as of 12/2005). So we must
116 test for alnum specially. */
117
118 memset(p, 0, cbit_length);
119 for (i = 0; i < 256; i++)
120 {
121 if (isdigit(i)) p[cbit_digit + i/8] |= 1u << (i&7);
122 if (isupper(i)) p[cbit_upper + i/8] |= 1u << (i&7);
123 if (islower(i)) p[cbit_lower + i/8] |= 1u << (i&7);
124 if (isalnum(i)) p[cbit_word + i/8] |= 1u << (i&7);
125 if (i == '_') p[cbit_word + i/8] |= 1u << (i&7);
126 if (isspace(i)) p[cbit_space + i/8] |= 1u << (i&7);
127 if (isxdigit(i)) p[cbit_xdigit + i/8] |= 1u << (i&7);
128 if (isgraph(i)) p[cbit_graph + i/8] |= 1u << (i&7);
129 if (isprint(i)) p[cbit_print + i/8] |= 1u << (i&7);
130 if (ispunct(i)) p[cbit_punct + i/8] |= 1u << (i&7);
131 if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1u << (i&7);
132 }
133 p += cbit_length;
134
135 /* Finally, the character type table. In this, we used to exclude VT from the
136 white space chars, because Perl didn't recognize it as such for \s and for
137 comments within regexes. However, Perl changed at release 5.18, so PCRE1
138 changed at release 8.34 and it's always been this way for PCRE2. */
139
140 for (i = 0; i < 256; i++)
141 {
142 int x = 0;
143 if (isspace(i)) x += ctype_space;
144 if (isalpha(i)) x += ctype_letter;
145 if (islower(i)) x += ctype_lcletter;
146 if (isdigit(i)) x += ctype_digit;
147 if (isalnum(i) || i == '_') x += ctype_word;
148 *p++ = x;
149 }
150
151 return yield;
152 }
153
154 #ifndef PCRE2_DFTABLES /* Compiling the library */
155 PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION
156 pcre2_maketables_free(pcre2_general_context *gcontext, const uint8_t *tables)
157 {
158 if (gcontext)
159 gcontext->memctl.free((void *)tables, gcontext->memctl.memory_data);
160 else
161 free((void *)tables);
162 }
163 #endif
164
165 /* End of pcre2_maketables.c */
166
