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
57 /*************************************************
58 * Create PCRE2 character tables *
59 *************************************************/
60
61 /* This function builds a set of character tables for use by PCRE2 and returns
62 a pointer to them. They are build using the ctype functions, and consequently
63 their contents will depend upon the current locale setting. When compiled as
64 part of the library, the store is obtained via a general context malloc, if
65 supplied, but when PCRE2_DFTABLES is defined (when compiling the pcre2_dftables
66 freestanding auxiliary program) malloc() is used, and the function has a
67 different name so as not to clash with the prototype in pcre2.h.
68
69 Arguments: none when PCRE2_DFTABLES is defined
70 else a PCRE2 general context or NULL
71 Returns: pointer to the contiguous block of data
72 else NULL if memory allocation failed
73 */
74
75 #ifdef PCRE2_DFTABLES /* Included in freestanding pcre2_dftables program */
maketables(void)76 static const uint8_t *maketables(void)
77 {
78 uint8_t *yield = (uint8_t *)malloc(TABLES_LENGTH);
79
80 #else /* Not PCRE2_DFTABLES, that is, compiling the library */
81 PCRE2_EXP_DEFN const uint8_t * PCRE2_CALL_CONVENTION
82 pcre2_maketables(pcre2_general_context *gcontext)
83 {
84 uint8_t *yield = (uint8_t *)((gcontext != NULL)?
85 gcontext->memctl.malloc(TABLES_LENGTH, gcontext->memctl.memory_data) :
86 malloc(TABLES_LENGTH));
87 #endif /* PCRE2_DFTABLES */
88
89 int i;
90 uint8_t *p;
91
92 if (yield == NULL) return NULL;
93 p = yield;
94
95 /* First comes the lower casing table */
96
97 for (i = 0; i < 256; i++) *p++ = tolower(i);
98
99 /* Next the case-flipping table */
100
101 for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
102
103 /* Then the character class tables. Don't try to be clever and save effort on
104 exclusive ones - in some locales things may be different.
105
106 Note that the table for "space" includes everything "isspace" gives, including
107 VT in the default locale. This makes it work for the POSIX class [:space:].
108 From PCRE1 release 8.34 and for all PCRE2 releases it is also correct for Perl
109 space, because Perl added VT at release 5.18.
110
111 Note also that it is possible for a character to be alnum or alpha without
112 being lower or upper, such as "male and female ordinals" (\xAA and \xBA) in the
113 fr_FR locale (at least under Debian Linux's locales as of 12/2005). So we must
114 test for alnum specially. */
115
116 memset(p, 0, cbit_length);
117 for (i = 0; i < 256; i++)
118 {
119 if (isdigit(i)) p[cbit_digit + i/8] |= 1u << (i&7);
120 if (isupper(i)) p[cbit_upper + i/8] |= 1u << (i&7);
121 if (islower(i)) p[cbit_lower + i/8] |= 1u << (i&7);
122 if (isalnum(i)) p[cbit_word + i/8] |= 1u << (i&7);
123 if (i == '_') p[cbit_word + i/8] |= 1u << (i&7);
124 if (isspace(i)) p[cbit_space + i/8] |= 1u << (i&7);
125 if (isxdigit(i)) p[cbit_xdigit + i/8] |= 1u << (i&7);
126 if (isgraph(i)) p[cbit_graph + i/8] |= 1u << (i&7);
127 if (isprint(i)) p[cbit_print + i/8] |= 1u << (i&7);
128 if (ispunct(i)) p[cbit_punct + i/8] |= 1u << (i&7);
129 if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1u << (i&7);
130 }
131 p += cbit_length;
132
133 /* Finally, the character type table. In this, we used to exclude VT from the
134 white space chars, because Perl didn't recognize it as such for \s and for
135 comments within regexes. However, Perl changed at release 5.18, so PCRE1
136 changed at release 8.34 and it's always been this way for PCRE2. */
137
138 for (i = 0; i < 256; i++)
139 {
140 int x = 0;
141 if (isspace(i)) x += ctype_space;
142 if (isalpha(i)) x += ctype_letter;
143 if (islower(i)) x += ctype_lcletter;
144 if (isdigit(i)) x += ctype_digit;
145 if (isalnum(i) || i == '_') x += ctype_word;
146 *p++ = x;
147 }
148
149 return yield;
150 }
151
152 #ifndef PCRE2_DFTABLES /* Compiling the library */
153 PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION
154 pcre2_maketables_free(pcre2_general_context *gcontext, const uint8_t *tables)
155 {
156 if (gcontext)
157 gcontext->memctl.free((void *)tables, gcontext->memctl.memory_data);
158 else
159 free((void *)tables);
160 }
161 #endif
162
163 /* End of pcre2_maketables.c */
164
