thodg/libgit2/deps/pcre/pcre_string_utils.c

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• Hash : 9ceafb57
  Author :
  Date : 2019-01-12T22:55:31
  

  regexec: use pcre as our fallback/builtin regex Use PCRE 8.42 as the builtin regex implementation, using its POSIX compatibility layer. PCRE uses ASCII by default and the users locale will not influence its behavior, so its `regcomp` implementation is similar to `regcomp_l` with a C locale.

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• deps/pcre/pcre_string_utils.c

• /*************************************************
  *      Perl-Compatible Regular Expressions       *
  *************************************************/
  
  /* PCRE is a library of functions to support regular expressions whose syntax
  and semantics are as close as possible to those of the Perl 5 language.
  
                         Written by Philip Hazel
             Copyright (c) 1997-2014 University of Cambridge
  
  -----------------------------------------------------------------------------
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:
  
      * Redistributions of source code must retain the above copyright notice,
        this list of conditions and the following disclaimer.
  
      * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.
  
      * Neither the name of the University of Cambridge nor the names of its
        contributors may be used to endorse or promote products derived from
        this software without specific prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.
  -----------------------------------------------------------------------------
  */
  
  
  /* This module contains internal functions for comparing and finding the length
  of strings for different data item sizes. */
  
  
  #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  
  #include "pcre_internal.h"
  
  #ifndef COMPILE_PCRE8
  
  /*************************************************
  *           Compare string utilities             *
  *************************************************/
  
  /* The following two functions compares two strings. Basically a strcmp
  for non 8 bit characters.
  
  Arguments:
    str1        first string
    str2        second string
  
  Returns:      0 if both string are equal (like strcmp), 1 otherwise
  */
  
  int
  PRIV(strcmp_uc_uc)(const pcre_uchar *str1, const pcre_uchar *str2)
  {
  pcre_uchar c1;
  pcre_uchar c2;
  
  while (*str1 != '\0' || *str2 != '\0')
    {
    c1 = *str1++;
    c2 = *str2++;
    if (c1 != c2)
      return ((c1 > c2) << 1) - 1;
    }
  /* Both length and characters must be equal. */
  return 0;
  }
  
  #ifdef COMPILE_PCRE32
  
  int
  PRIV(strcmp_uc_uc_utf)(const pcre_uchar *str1, const pcre_uchar *str2)
  {
  pcre_uchar c1;
  pcre_uchar c2;
  
  while (*str1 != '\0' || *str2 != '\0')
    {
    c1 = UCHAR21INC(str1);
    c2 = UCHAR21INC(str2);
    if (c1 != c2)
      return ((c1 > c2) << 1) - 1;
    }
  /* Both length and characters must be equal. */
  return 0;
  }
  
  #endif /* COMPILE_PCRE32 */
  
  int
  PRIV(strcmp_uc_c8)(const pcre_uchar *str1, const char *str2)
  {
  const pcre_uint8 *ustr2 = (pcre_uint8 *)str2;
  pcre_uchar c1;
  pcre_uchar c2;
  
  while (*str1 != '\0' || *ustr2 != '\0')
    {
    c1 = *str1++;
    c2 = (pcre_uchar)*ustr2++;
    if (c1 != c2)
      return ((c1 > c2) << 1) - 1;
    }
  /* Both length and characters must be equal. */
  return 0;
  }
  
  #ifdef COMPILE_PCRE32
  
  int
  PRIV(strcmp_uc_c8_utf)(const pcre_uchar *str1, const char *str2)
  {
  const pcre_uint8 *ustr2 = (pcre_uint8 *)str2;
  pcre_uchar c1;
  pcre_uchar c2;
  
  while (*str1 != '\0' || *ustr2 != '\0')
    {
    c1 = UCHAR21INC(str1);
    c2 = (pcre_uchar)*ustr2++;
    if (c1 != c2)
      return ((c1 > c2) << 1) - 1;
    }
  /* Both length and characters must be equal. */
  return 0;
  }
  
  #endif /* COMPILE_PCRE32 */
  
  /* The following two functions compares two, fixed length
  strings. Basically an strncmp for non 8 bit characters.
  
  Arguments:
    str1        first string
    str2        second string
    num         size of the string
  
  Returns:      0 if both string are equal (like strcmp), 1 otherwise
  */
  
  int
  PRIV(strncmp_uc_uc)(const pcre_uchar *str1, const pcre_uchar *str2, unsigned int num)
  {
  pcre_uchar c1;
  pcre_uchar c2;
  
  while (num-- > 0)
    {
    c1 = *str1++;
    c2 = *str2++;
    if (c1 != c2)
      return ((c1 > c2) << 1) - 1;
    }
  /* Both length and characters must be equal. */
  return 0;
  }
  
  int
  PRIV(strncmp_uc_c8)(const pcre_uchar *str1, const char *str2, unsigned int num)
  {
  const pcre_uint8 *ustr2 = (pcre_uint8 *)str2;
  pcre_uchar c1;
  pcre_uchar c2;
  
  while (num-- > 0)
    {
    c1 = *str1++;
    c2 = (pcre_uchar)*ustr2++;
    if (c1 != c2)
      return ((c1 > c2) << 1) - 1;
    }
  /* Both length and characters must be equal. */
  return 0;
  }
  
  /* The following function returns with the length of
  a zero terminated string. Basically an strlen for non 8 bit characters.
  
  Arguments:
    str         string
  
  Returns:      length of the string
  */
  
  unsigned int
  PRIV(strlen_uc)(const pcre_uchar *str)
  {
  unsigned int len = 0;
  while (*str++ != 0)
    len++;
  return len;
  }
  
  #endif /* !COMPILE_PCRE8 */
  
  /* End of pcre_string_utils.c */
  

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