pcre_string_utils.c

   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            Copyright (c) 1997-2014 University of Cambridge
  10
  11 -----------------------------------------------------------------------------
  12 Redistribution and use in source and binary forms, with or without
  13 modification, are permitted provided that the following conditions are met:
  14
  15     * Redistributions of source code must retain the above copyright notice,
  16       this list of conditions and the following disclaimer.
  17
  18     * Redistributions in binary form must reproduce the above copyright
  19       notice, this list of conditions and the following disclaimer in the
  20       documentation and/or other materials provided with the distribution.
  21
  22     * Neither the name of the University of Cambridge nor the names of its
  23       contributors may be used to endorse or promote products derived from
  24       this software without specific prior written permission.
  25
  26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  36 POSSIBILITY OF SUCH DAMAGE.
  37 -----------------------------------------------------------------------------
  38 */
  39
  40
  41 /* This module contains internal functions for comparing and finding the length
  42 of strings for different data item sizes. */
  43
  44
  45 #ifdef HAVE_CONFIG_H
  46 #include "config.h"
  47 #endif
  48
  49 #include "pcre_internal.h"
  50
  51 #ifndef COMPILE_PCRE8
  52
  53 /*************************************************
  54 *           Compare string utilities             *
  55 *************************************************/
  56
  57 /* The following two functions compares two strings. Basically a strcmp
  58 for non 8 bit characters.
  59
  60 Arguments:
  61   str1        first string
  62   str2        second string
  63
  64 Returns:      0 if both string are equal (like strcmp), 1 otherwise
  65 */
  66
  67 int
  68 PRIV(strcmp_uc_uc)(const pcre_uchar *str1, const pcre_uchar *str2)
  69 {
  70 pcre_uchar c1;
  71 pcre_uchar c2;
  72
  73 while (*str1 != '\0' || *str2 != '\0')
  74   {
  75   c1 = *str1++;
  76   c2 = *str2++;
  77   if (c1 != c2)
  78     return ((c1 > c2) << 1) - 1;
  79   }
  80 /* Both length and characters must be equal. */
  81 return 0;
  82 }
  83
  84 #ifdef COMPILE_PCRE32
  85
  86 int
  87 PRIV(strcmp_uc_uc_utf)(const pcre_uchar *str1, const pcre_uchar *str2)
  88 {
  89 pcre_uchar c1;
  90 pcre_uchar c2;
  91
  92 while (*str1 != '\0' || *str2 != '\0')
  93   {
  94   c1 = UCHAR21INC(str1);
  95   c2 = UCHAR21INC(str2);
  96   if (c1 != c2)
  97     return ((c1 > c2) << 1) - 1;
  98   }
  99 /* Both length and characters must be equal. */
 100 return 0;
 101 }
 102
 103 #endif /* COMPILE_PCRE32 */
 104
 105 int
 106 PRIV(strcmp_uc_c8)(const pcre_uchar *str1, const char *str2)
 107 {
 108 const pcre_uint8 *ustr2 = (pcre_uint8 *)str2;
 109 pcre_uchar c1;
 110 pcre_uchar c2;
 111
 112 while (*str1 != '\0' || *ustr2 != '\0')
 113   {
 114   c1 = *str1++;
 115   c2 = (pcre_uchar)*ustr2++;
 116   if (c1 != c2)
 117     return ((c1 > c2) << 1) - 1;
 118   }
 119 /* Both length and characters must be equal. */
 120 return 0;
 121 }
 122
 123 #ifdef COMPILE_PCRE32
 124
 125 int
 126 PRIV(strcmp_uc_c8_utf)(const pcre_uchar *str1, const char *str2)
 127 {
 128 const pcre_uint8 *ustr2 = (pcre_uint8 *)str2;
 129 pcre_uchar c1;
 130 pcre_uchar c2;
 131
 132 while (*str1 != '\0' || *ustr2 != '\0')
 133   {
 134   c1 = UCHAR21INC(str1);
 135   c2 = (pcre_uchar)*ustr2++;
 136   if (c1 != c2)
 137     return ((c1 > c2) << 1) - 1;
 138   }
 139 /* Both length and characters must be equal. */
 140 return 0;
 141 }
 142
 143 #endif /* COMPILE_PCRE32 */
 144
 145 /* The following two functions compares two, fixed length
 146 strings. Basically an strncmp for non 8 bit characters.
 147
 148 Arguments:
 149   str1        first string
 150   str2        second string
 151   num         size of the string
 152
 153 Returns:      0 if both string are equal (like strcmp), 1 otherwise
 154 */
 155
 156 int
 157 PRIV(strncmp_uc_uc)(const pcre_uchar *str1, const pcre_uchar *str2, unsigned int num)
 158 {
 159 pcre_uchar c1;
 160 pcre_uchar c2;
 161
 162 while (num-- > 0)
 163   {
 164   c1 = *str1++;
 165   c2 = *str2++;
 166   if (c1 != c2)
 167     return ((c1 > c2) << 1) - 1;
 168   }
 169 /* Both length and characters must be equal. */
 170 return 0;
 171 }
 172
 173 int
 174 PRIV(strncmp_uc_c8)(const pcre_uchar *str1, const char *str2, unsigned int num)
 175 {
 176 const pcre_uint8 *ustr2 = (pcre_uint8 *)str2;
 177 pcre_uchar c1;
 178 pcre_uchar c2;
 179
 180 while (num-- > 0)
 181   {
 182   c1 = *str1++;
 183   c2 = (pcre_uchar)*ustr2++;
 184   if (c1 != c2)
 185     return ((c1 > c2) << 1) - 1;
 186   }
 187 /* Both length and characters must be equal. */
 188 return 0;
 189 }
 190
 191 /* The following function returns with the length of
 192 a zero terminated string. Basically an strlen for non 8 bit characters.
 193
 194 Arguments:
 195   str         string
 196
 197 Returns:      length of the string
 198 */
 199
 200 unsigned int
 201 PRIV(strlen_uc)(const pcre_uchar *str)
 202 {
 203 unsigned int len = 0;
 204 while (*str++ != 0)
 205   len++;
 206 return len;
 207 }
 208
 209 #endif /* !COMPILE_PCRE8 */
 210
 211 /* End of pcre_string_utils.c */