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pcre

    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) 1997-2012 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 an internal function that is used to match an extended
   42: class. It is used by both pcre_exec() and pcre_def_exec(). */
   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 an 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: int
   85: PRIV(strcmp_uc_c8)(const pcre_uchar *str1, const char *str2)
   86: {
   87: const pcre_uint8 *ustr2 = (pcre_uint8 *)str2;
   88: pcre_uchar c1;
   89: pcre_uchar c2;
   90: 
   91: while (*str1 != '\0' || *ustr2 != '\0')
   92:   {
   93:   c1 = *str1++;
   94:   c2 = (pcre_uchar)*ustr2++;
   95:   if (c1 != c2)
   96:     return ((c1 > c2) << 1) - 1;
   97:   }
   98: /* Both length and characters must be equal. */
   99: return 0;
  100: }
  101: 
  102: /* The following two functions compares two, fixed length
  103: strings. Basically an strncmp for non 8 bit characters.
  104: 
  105: Arguments:
  106:   str1        first string
  107:   str2        second string
  108:   num         size of the string
  109: 
  110: Returns:      0 if both string are equal (like strcmp), 1 otherwise
  111: */
  112: 
  113: int
  114: PRIV(strncmp_uc_uc)(const pcre_uchar *str1, const pcre_uchar *str2, unsigned int num)
  115: {
  116: pcre_uchar c1;
  117: pcre_uchar c2;
  118: 
  119: while (num-- > 0)
  120:   {
  121:   c1 = *str1++;
  122:   c2 = *str2++;
  123:   if (c1 != c2)
  124:     return ((c1 > c2) << 1) - 1;
  125:   }
  126: /* Both length and characters must be equal. */
  127: return 0;
  128: }
  129: 
  130: int
  131: PRIV(strncmp_uc_c8)(const pcre_uchar *str1, const char *str2, unsigned int num)
  132: {
  133: const pcre_uint8 *ustr2 = (pcre_uint8 *)str2;
  134: pcre_uchar c1;
  135: pcre_uchar c2;
  136: 
  137: while (num-- > 0)
  138:   {
  139:   c1 = *str1++;
  140:   c2 = (pcre_uchar)*ustr2++;
  141:   if (c1 != c2)
  142:     return ((c1 > c2) << 1) - 1;
  143:   }
  144: /* Both length and characters must be equal. */
  145: return 0;
  146: }
  147: 
  148: /* The following function returns with the length of
  149: a zero terminated string. Basically an strlen for non 8 bit characters.
  150: 
  151: Arguments:
  152:   str         string
  153: 
  154: Returns:      length of the string
  155: */
  156: 
  157: unsigned int
  158: PRIV(strlen_uc)(const pcre_uchar *str)
  159: {
  160: unsigned int len = 0;
  161: while (*str++ != 0)
  162:   len++;
  163: return len;
  164: }
  165: 
  166: #endif /* COMPILE_PCRE8 */
  167: 
  168: /* End of pcre_string_utils.c */