Janis Danisevskis | 112c9cc | 2016-03-31 13:35:25 +0100 | [diff] [blame] | 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 |
Elliott Hughes | 4e19c8e | 2022-04-15 15:11:02 -0700 | [diff] [blame] | 10 | New API code Copyright (c) 2018-2021 University of Cambridge |
Janis Danisevskis | 112c9cc | 2016-03-31 13:35:25 +0100 | [diff] [blame] | 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 | /************************************************* |
Elliott Hughes | 653c210 | 2019-01-09 15:41:36 -0800 | [diff] [blame] | 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 | /************************************************* |
Janis Danisevskis | 112c9cc | 2016-03-31 13:35:25 +0100 | [diff] [blame] | 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 */ |