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) 2018 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 /* This module contains internal functions for comparing and finding the length 42 of strings. These are used instead of strcmp() etc because the standard 43 functions work only on 8-bit data. */ 44 45 46 #ifdef HAVE_CONFIG_H 47 #include "config.h" 48 #endif 49 50 #include "pcre2_internal.h" 51 52 53 /************************************************* 54 * Emulated memmove() for systems without it * 55 *************************************************/ 56 57 /* This function can make use of bcopy() if it is available. Otherwise do it by 58 steam, as there some non-Unix environments that lack both memmove() and 59 bcopy(). */ 60 61 #if !defined(VPCOMPAT) && !defined(HAVE_MEMMOVE) 62 void * 63 PRIV(memmove)(void *d, const void *s, size_t n) 64 { 65 #ifdef HAVE_BCOPY 66 bcopy(s, d, n); 67 return d; 68 #else 69 size_t i; 70 unsigned char *dest = (unsigned char *)d; 71 const unsigned char *src = (const unsigned char *)s; 72 if (dest > src) 73 { 74 dest += n; 75 src += n; 76 for (i = 0; i < n; ++i) *(--dest) = *(--src); 77 return (void *)dest; 78 } 79 else 80 { 81 for (i = 0; i < n; ++i) *dest++ = *src++; 82 return (void *)(dest - n); 83 } 84 #endif /* not HAVE_BCOPY */ 85 } 86 #endif /* not VPCOMPAT && not HAVE_MEMMOVE */ 87 88 89 /************************************************* 90 * Compare two zero-terminated PCRE2 strings * 91 *************************************************/ 92 93 /* 94 Arguments: 95 str1 first string 96 str2 second string 97 98 Returns: 0, 1, or -1 99 */ 100 101 int 102 PRIV(strcmp)(PCRE2_SPTR str1, PCRE2_SPTR str2) 103 { 104 PCRE2_UCHAR c1, c2; 105 while (*str1 != '\0' || *str2 != '\0') 106 { 107 c1 = *str1++; 108 c2 = *str2++; 109 if (c1 != c2) return ((c1 > c2) << 1) - 1; 110 } 111 return 0; 112 } 113 114 115 /************************************************* 116 * Compare zero-terminated PCRE2 & 8-bit strings * 117 *************************************************/ 118 119 /* As the 8-bit string is almost always a literal, its type is specified as 120 const char *. 121 122 Arguments: 123 str1 first string 124 str2 second string 125 126 Returns: 0, 1, or -1 127 */ 128 129 int 130 PRIV(strcmp_c8)(PCRE2_SPTR str1, const char *str2) 131 { 132 PCRE2_UCHAR c1, c2; 133 while (*str1 != '\0' || *str2 != '\0') 134 { 135 c1 = *str1++; 136 c2 = *str2++; 137 if (c1 != c2) return ((c1 > c2) << 1) - 1; 138 } 139 return 0; 140 } 141 142 143 /************************************************* 144 * Compare two PCRE2 strings, given a length * 145 *************************************************/ 146 147 /* 148 Arguments: 149 str1 first string 150 str2 second string 151 len the length 152 153 Returns: 0, 1, or -1 154 */ 155 156 int 157 PRIV(strncmp)(PCRE2_SPTR str1, PCRE2_SPTR str2, size_t len) 158 { 159 PCRE2_UCHAR c1, c2; 160 for (; len > 0; len--) 161 { 162 c1 = *str1++; 163 c2 = *str2++; 164 if (c1 != c2) return ((c1 > c2) << 1) - 1; 165 } 166 return 0; 167 } 168 169 170 /************************************************* 171 * Compare PCRE2 string to 8-bit string by length * 172 *************************************************/ 173 174 /* As the 8-bit string is almost always a literal, its type is specified as 175 const char *. 176 177 Arguments: 178 str1 first string 179 str2 second string 180 len the length 181 182 Returns: 0, 1, or -1 183 */ 184 185 int 186 PRIV(strncmp_c8)(PCRE2_SPTR str1, const char *str2, size_t len) 187 { 188 PCRE2_UCHAR c1, c2; 189 for (; len > 0; len--) 190 { 191 c1 = *str1++; 192 c2 = *str2++; 193 if (c1 != c2) return ((c1 > c2) << 1) - 1; 194 } 195 return 0; 196 } 197 198 199 /************************************************* 200 * Find the length of a PCRE2 string * 201 *************************************************/ 202 203 /* 204 Argument: the string 205 Returns: the length 206 */ 207 208 PCRE2_SIZE 209 PRIV(strlen)(PCRE2_SPTR str) 210 { 211 PCRE2_SIZE c = 0; 212 while (*str++ != 0) c++; 213 return c; 214 } 215 216 217 /************************************************* 218 * Copy 8-bit 0-terminated string to PCRE2 string * 219 *************************************************/ 220 221 /* Arguments: 222 str1 buffer to receive the string 223 str2 8-bit string to be copied 224 225 Returns: the number of code units used (excluding trailing zero) 226 */ 227 228 PCRE2_SIZE 229 PRIV(strcpy_c8)(PCRE2_UCHAR *str1, const char *str2) 230 { 231 PCRE2_UCHAR *t = str1; 232 while (*str2 != 0) *t++ = *str2++; 233 *t = 0; 234 return t - str1; 235 } 236 237 /* End of pcre2_string_utils.c */ 238
