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 Copyright (c) 1997-2012 University of Cambridge 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 62 part of the library, the store is obtained via PUBL(malloc)(), but when 63 compiled inside dftables, use malloc(). 64 65 Arguments: none 66 Returns: pointer to the contiguous block of data 67 */ 68 69 #if defined COMPILE_PCRE8 70 const unsigned char * 71 pcre_maketables(void) 72 #elif defined COMPILE_PCRE16 73 const unsigned char * 74 pcre16_maketables(void) 75 #elif defined COMPILE_PCRE32 76 const unsigned char * 77 pcre32_maketables(void) 78 #endif 79 { 80 unsigned char *yield, *p; 81 int i; 82 83 #ifndef DFTABLES 84 yield = (unsigned char*)(PUBL(malloc))(tables_length); 85 #else 86 yield = (unsigned char*)malloc(tables_length); 87 #endif 88 89 if (yield == NULL) return NULL; 90 p = yield; 91 92 /* First comes the lower casing table */ 93 94 for (i = 0; i < 256; i++) *p++ = tolower(i); 95 96 /* Next the case-flipping table */ 97 98 for (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 101 exclusive ones - in some locales things may be different. 102 103 Note that the table for "space" includes everything "isspace" gives, including 104 VT in the default locale. This makes it work for the POSIX class [:space:]. 105 From release 8.34 is is also correct for Perl space, because Perl added VT at 106 release 5.18. 107 108 Note also that it is possible for a character to be alnum or alpha without 109 being lower or upper, such as "male and female ordinals" (\xAA and \xBA) in the 110 fr_FR locale (at least under Debian Linux's locales as of 12/2005). So we must 111 test for alnum specially. */ 112 113 memset(p, 0, cbit_length); 114 for (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 } 128 p += cbit_length; 129 130 /* Finally, the character type table. In this, we used to exclude VT from the 131 white space chars, because Perl didn't recognize it as such for \s and for 132 comments within regexes. However, Perl changed at release 5.18, so PCRE changed 133 at release 8.34. */ 134 135 for (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 } 152 153 return yield; 154 } 155 156 /* End of pcre_maketables.c */ 157
