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 #ifdef HAVE_CONFIG_H 42 #include "config.h" 43 #endif 44 45 /* Save the configured link size, which is in bytes. In 16-bit and 32-bit modes 46 its value gets changed by pcre2_internal.h to be in code units. */ 47 48 static int configured_link_size = LINK_SIZE; 49 50 #include "pcre2_internal.h" 51 52 /* These macros are the standard way of turning unquoted text into C strings. 53 They allow macros like PCRE2_MAJOR to be defined without quotes, which is 54 convenient for user programs that want to test their values. */ 55 56 #define STRING(a) # a 57 #define XSTRING(s) STRING(s) 58 59 60 /************************************************* 61 * Return info about what features are configured * 62 *************************************************/ 63 64 /* If where is NULL, the length of memory required is returned. 65 66 Arguments: 67 what what information is required 68 where where to put the information 69 70 Returns: 0 if a numerical value is returned 71 >= 0 if a string value 72 PCRE2_ERROR_BADOPTION if "where" not recognized 73 or JIT target requested when JIT not enabled 74 */ 75 76 PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION 77 pcre2_config(uint32_t what, void *where) 78 { 79 if (where == NULL) /* Requests a length */ 80 { 81 switch(what) 82 { 83 default: 84 return PCRE2_ERROR_BADOPTION; 85 86 case PCRE2_CONFIG_BSR: 87 case PCRE2_CONFIG_JIT: 88 case PCRE2_CONFIG_LINKSIZE: 89 case PCRE2_CONFIG_MATCHLIMIT: 90 case PCRE2_CONFIG_NEWLINE: 91 case PCRE2_CONFIG_PARENSLIMIT: 92 case PCRE2_CONFIG_RECURSIONLIMIT: 93 case PCRE2_CONFIG_STACKRECURSE: 94 case PCRE2_CONFIG_UNICODE: 95 return sizeof(uint32_t); 96 97 /* These are handled below */ 98 99 case PCRE2_CONFIG_JITTARGET: 100 case PCRE2_CONFIG_UNICODE_VERSION: 101 case PCRE2_CONFIG_VERSION: 102 break; 103 } 104 } 105 106 switch (what) 107 { 108 default: 109 return PCRE2_ERROR_BADOPTION; 110 111 case PCRE2_CONFIG_BSR: 112 #ifdef BSR_ANYCRLF 113 *((uint32_t *)where) = PCRE2_BSR_ANYCRLF; 114 #else 115 *((uint32_t *)where) = PCRE2_BSR_UNICODE; 116 #endif 117 break; 118 119 case PCRE2_CONFIG_JIT: 120 #ifdef SUPPORT_JIT 121 *((uint32_t *)where) = 1; 122 #else 123 *((uint32_t *)where) = 0; 124 #endif 125 break; 126 127 case PCRE2_CONFIG_JITTARGET: 128 #ifdef SUPPORT_JIT 129 { 130 const char *v = PRIV(jit_get_target)(); 131 return (int)(1 + ((where == NULL)? 132 strlen(v) : PRIV(strcpy_c8)((PCRE2_UCHAR *)where, v))); 133 } 134 #else 135 return PCRE2_ERROR_BADOPTION; 136 #endif 137 138 case PCRE2_CONFIG_LINKSIZE: 139 *((uint32_t *)where) = (uint32_t)configured_link_size; 140 break; 141 142 case PCRE2_CONFIG_MATCHLIMIT: 143 *((uint32_t *)where) = MATCH_LIMIT; 144 break; 145 146 case PCRE2_CONFIG_NEWLINE: 147 *((uint32_t *)where) = NEWLINE_DEFAULT; 148 break; 149 150 case PCRE2_CONFIG_PARENSLIMIT: 151 *((uint32_t *)where) = PARENS_NEST_LIMIT; 152 break; 153 154 case PCRE2_CONFIG_RECURSIONLIMIT: 155 *((uint32_t *)where) = MATCH_LIMIT_RECURSION; 156 break; 157 158 case PCRE2_CONFIG_STACKRECURSE: 159 #ifdef HEAP_MATCH_RECURSE 160 *((uint32_t *)where) = 0; 161 #else 162 *((uint32_t *)where) = 1; 163 #endif 164 break; 165 166 case PCRE2_CONFIG_UNICODE_VERSION: 167 { 168 #if defined SUPPORT_UNICODE 169 const char *v = PRIV(unicode_version); 170 #else 171 const char *v = "Unicode not supported"; 172 #endif 173 return (int)(1 + ((where == NULL)? 174 strlen(v) : PRIV(strcpy_c8)((PCRE2_UCHAR *)where, v))); 175 } 176 break; 177 178 case PCRE2_CONFIG_UNICODE: 179 #if defined SUPPORT_UNICODE 180 *((uint32_t *)where) = 1; 181 #else 182 *((uint32_t *)where) = 0; 183 #endif 184 break; 185 186 /* The hackery in setting "v" below is to cope with the case when 187 PCRE2_PRERELEASE is set to an empty string (which it is for real releases). 188 If the second alternative is used in this case, it does not leave a space 189 before the date. On the other hand, if all four macros are put into a single 190 XSTRING when PCRE2_PRERELEASE is not empty, an unwanted space is inserted. 191 There are problems using an "obvious" approach like this: 192 193 XSTRING(PCRE2_MAJOR) "." XSTRING(PCRE_MINOR) 194 XSTRING(PCRE2_PRERELEASE) " " XSTRING(PCRE_DATE) 195 196 because, when PCRE2_PRERELEASE is empty, this leads to an attempted expansion 197 of STRING(). The C standard states: "If (before argument substitution) any 198 argument consists of no preprocessing tokens, the behavior is undefined." It 199 turns out the gcc treats this case as a single empty string - which is what 200 we really want - but Visual C grumbles about the lack of an argument for the 201 macro. Unfortunately, both are within their rights. As there seems to be no 202 way to test for a macro's value being empty at compile time, we have to 203 resort to a runtime test. */ 204 205 case PCRE2_CONFIG_VERSION: 206 { 207 const char *v = (XSTRING(Z PCRE2_PRERELEASE)[1] == 0)? 208 XSTRING(PCRE2_MAJOR.PCRE2_MINOR PCRE2_DATE) : 209 XSTRING(PCRE2_MAJOR.PCRE2_MINOR) XSTRING(PCRE2_PRERELEASE PCRE2_DATE); 210 return (int)(1 + ((where == NULL)? 211 strlen(v) : PRIV(strcpy_c8)((PCRE2_UCHAR *)where, v))); 212 } 213 } 214 215 return 0; 216 } 217 218 /* End of pcre2_config.c */ 219
