Annotation of embedaddon/pcre/pcre_maketables.c, revision 1.1.1.2
1.1 misho 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
1.1.1.2 ! misho 9: Copyright (c) 1997-2012 University of Cambridge
1.1 misho 10:
11: -----------------------------------------------------------------------------
12: Redistribution and use in source and binary forms, with or without
13: modification, 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:
26: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36: POSSIBILITY OF SUCH DAMAGE.
37: -----------------------------------------------------------------------------
38: */
39:
40:
41: /* This module contains the external function pcre_maketables(), which builds
42: character tables for PCRE in the current locale. The file is compiled on its
43: own as part of the PCRE library. However, it is also included in the
44: compilation 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
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
1.1.1.2 ! misho 62: part of the library, the store is obtained via PUBL(malloc)(), but when
! 63: compiled inside dftables, use malloc().
1.1 misho 64:
65: Arguments: none
66: Returns: pointer to the contiguous block of data
67: */
68:
1.1.1.2 ! misho 69: #ifdef COMPILE_PCRE8
1.1 misho 70: const unsigned char *
71: pcre_maketables(void)
1.1.1.2 ! misho 72: #else
! 73: const unsigned char *
! 74: pcre16_maketables(void)
! 75: #endif
1.1 misho 76: {
77: unsigned char *yield, *p;
78: int i;
79:
80: #ifndef DFTABLES
1.1.1.2 ! misho 81: yield = (unsigned char*)(PUBL(malloc))(tables_length);
1.1 misho 82: #else
83: yield = (unsigned char*)malloc(tables_length);
84: #endif
85:
86: if (yield == NULL) return NULL;
87: p = yield;
88:
89: /* First comes the lower casing table */
90:
91: for (i = 0; i < 256; i++) *p++ = tolower(i);
92:
93: /* Next the case-flipping table */
94:
95: for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
96:
97: /* Then the character class tables. Don't try to be clever and save effort on
98: exclusive ones - in some locales things may be different. Note that the table
99: for "space" includes everything "isspace" gives, including VT in the default
100: locale. This makes it work for the POSIX class [:space:]. Note also that it is
101: possible for a character to be alnum or alpha without being lower or upper,
102: such as "male and female ordinals" (\xAA and \xBA) in the fr_FR locale (at
103: least under Debian Linux's locales as of 12/2005). So we must test for alnum
104: specially. */
105:
106: memset(p, 0, cbit_length);
107: for (i = 0; i < 256; i++)
108: {
109: if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
110: if (isupper(i)) p[cbit_upper + i/8] |= 1 << (i&7);
111: if (islower(i)) p[cbit_lower + i/8] |= 1 << (i&7);
112: if (isalnum(i)) p[cbit_word + i/8] |= 1 << (i&7);
113: if (i == '_') p[cbit_word + i/8] |= 1 << (i&7);
114: if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
115: if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7);
116: if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7);
117: if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7);
118: if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7);
119: if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7);
120: }
121: p += cbit_length;
122:
123: /* Finally, the character type table. In this, we exclude VT from the white
124: space chars, because Perl doesn't recognize it as such for \s and for comments
125: within regexes. */
126:
127: for (i = 0; i < 256; i++)
128: {
129: int x = 0;
130: if (i != 0x0b && isspace(i)) x += ctype_space;
131: if (isalpha(i)) x += ctype_letter;
132: if (isdigit(i)) x += ctype_digit;
133: if (isxdigit(i)) x += ctype_xdigit;
134: if (isalnum(i) || i == '_') x += ctype_word;
135:
136: /* Note: strchr includes the terminating zero in the characters it considers.
137: In this instance, that is ok because we want binary zero to be flagged as a
138: meta-character, which in this sense is any character that terminates a run
139: of data characters. */
140:
141: if (strchr("\\*+?{^.$|()[", i) != 0) x += ctype_meta;
142: *p++ = x;
143: }
144:
145: return yield;
146: }
147:
148: /* End of pcre_maketables.c */
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