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 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. However, it is also included in the 45 compilation 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 61 a pointer to them. They are build using the ctype functions, and consequently 62 their contents will depend upon the current locale setting. When compiled as 63 part of the library, the store is obtained via a general context malloc, if 64 supplied, but when DFTABLES is defined (when compiling the dftables auxiliary 65 program) malloc() is used, and the function has a different name so as not to 66 clash with the prototype in pcre2.h. 67 68 Arguments: none when DFTABLES is defined 69 else a PCRE2 general context or NULL 70 Returns: pointer to the contiguous block of data 71 */ 72 73 #ifdef DFTABLES /* Included in freestanding dftables.c program */ 74 static const uint8_t *maketables(void) 75 { 76 uint8_t *yield = (uint8_t *)malloc(tables_length); 77 78 #else /* Not DFTABLES, 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 /* 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++) *p++ = islower(i)? toupper(i) : tolower(i); 100 101 /* Then the character class tables. Don't try to be clever and save effort on 102 exclusive ones - in some locales things may be different. 103 104 Note that the table for "space" includes everything "isspace" gives, including 105 VT in the default locale. This makes it work for the POSIX class [:space:]. 106 From release 8.34 is is also correct for Perl space, because Perl added VT at 107 release 5.18. 108 109 Note also that it is possible for a character to be alnum or alpha without 110 being lower or upper, such as "male and female ordinals" (\xAA and \xBA) in the 111 fr_FR locale (at least under Debian Linux's locales as of 12/2005). So we must 112 test for alnum specially. */ 113 114 memset(p, 0, cbit_length); 115 for (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 } 129 p += cbit_length; 130 131 /* Finally, the character type table. In this, we used to exclude VT from the 132 white space chars, because Perl didn't recognize it as such for \s and for 133 comments within regexes. However, Perl changed at release 5.18, so PCRE changed 134 at release 8.34. */ 135 136 for (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 } 153 154 return yield; 155 } 156 157 /* End of pcre2_maketables.c */ 158
