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 /* 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 * Compare two zero-terminated PCRE2 strings * 55 *************************************************/ 56 57 /* 58 Arguments: 59 str1 first string 60 str2 second string 61 62 Returns: 0, 1, or -1 63 */ 64 65 int 66 PRIV(strcmp)(PCRE2_SPTR str1, PCRE2_SPTR str2) 67 { 68 PCRE2_UCHAR c1, c2; 69 while (*str1 != '\0' || *str2 != '\0') 70 { 71 c1 = *str1++; 72 c2 = *str2++; 73 if (c1 != c2) return ((c1 > c2) << 1) - 1; 74 } 75 return 0; 76 } 77 78 79 /************************************************* 80 * Compare zero-terminated PCRE2 & 8-bit strings * 81 *************************************************/ 82 83 /* As the 8-bit string is almost always a literal, its type is specified as 84 const char *. 85 86 Arguments: 87 str1 first string 88 str2 second string 89 90 Returns: 0, 1, or -1 91 */ 92 93 int 94 PRIV(strcmp_c8)(PCRE2_SPTR str1, const char *str2) 95 { 96 PCRE2_UCHAR c1, c2; 97 while (*str1 != '\0' || *str2 != '\0') 98 { 99 c1 = *str1++; 100 c2 = *str2++; 101 if (c1 != c2) return ((c1 > c2) << 1) - 1; 102 } 103 return 0; 104 } 105 106 107 /************************************************* 108 * Compare two PCRE2 strings, given a length * 109 *************************************************/ 110 111 /* 112 Arguments: 113 str1 first string 114 str2 second string 115 len the length 116 117 Returns: 0, 1, or -1 118 */ 119 120 int 121 PRIV(strncmp)(PCRE2_SPTR str1, PCRE2_SPTR str2, size_t len) 122 { 123 PCRE2_UCHAR c1, c2; 124 for (; len > 0; len--) 125 { 126 c1 = *str1++; 127 c2 = *str2++; 128 if (c1 != c2) return ((c1 > c2) << 1) - 1; 129 } 130 return 0; 131 } 132 133 134 /************************************************* 135 * Compare PCRE2 string to 8-bit string by length * 136 *************************************************/ 137 138 /* As the 8-bit string is almost always a literal, its type is specified as 139 const char *. 140 141 Arguments: 142 str1 first string 143 str2 second string 144 len the length 145 146 Returns: 0, 1, or -1 147 */ 148 149 int 150 PRIV(strncmp_c8)(PCRE2_SPTR str1, const char *str2, size_t len) 151 { 152 PCRE2_UCHAR c1, c2; 153 for (; len > 0; len--) 154 { 155 c1 = *str1++; 156 c2 = *str2++; 157 if (c1 != c2) return ((c1 > c2) << 1) - 1; 158 } 159 return 0; 160 } 161 162 163 /************************************************* 164 * Find the length of a PCRE2 string * 165 *************************************************/ 166 167 /* 168 Argument: the string 169 Returns: the length 170 */ 171 172 PCRE2_SIZE 173 PRIV(strlen)(PCRE2_SPTR str) 174 { 175 PCRE2_SIZE c = 0; 176 while (*str++ != 0) c++; 177 return c; 178 } 179 180 181 /************************************************* 182 * Copy 8-bit 0-terminated string to PCRE2 string * 183 *************************************************/ 184 185 /* Arguments: 186 str1 buffer to receive the string 187 str2 8-bit string to be copied 188 189 Returns: the number of code units used (excluding trailing zero) 190 */ 191 192 PCRE2_SIZE 193 PRIV(strcpy_c8)(PCRE2_UCHAR *str1, const char *str2) 194 { 195 PCRE2_UCHAR *t = str1; 196 while (*str2 != 0) *t++ = *str2++; 197 *t = 0; 198 return t - str1; 199 } 200 201 /* End of pcre2_string_utils.c */ 202
