kc3-lang/gnulib/lib/mbscasecmp.c

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• Hash : 6887c632
  Author :
  Date : 2023-09-07T14:51:58
  

  mbscasecmp: support GNULIB_MCEL_PREFER
  
  * lib/mbscasecmp.c: Include stdlib.h, since we use MB_CUR_MAX.
  Include uchar.h, for c32tolower.
  (GNULIB_MCEL_PREFER): Include mcel.h instead of mbuiterf.h.
  (mbscasecmp) [GNULIB_MCEL_PREFER]: Use mcel instead of mbuiterf.
  * modules/mbscasecmp (Depends-on): Add c32tolower, stdlib, uchar.
  Depend on mbuiterf only if not preferring mcel.
  

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• lib/mbscasecmp.c

• /* Case-insensitive string comparison function.
     Copyright (C) 1998-1999, 2005-2023 Free Software Foundation, Inc.
     Written by Bruno Haible <bruno@clisp.org>, 2005,
     based on earlier glibc code.
  
     This file is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as
     published by the Free Software Foundation, either version 3 of the
     License, or (at your option) any later version.
  
     This file is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <string.h>
  
  #include <ctype.h>
  #include <limits.h>
  #include <stdlib.h>
  #include <uchar.h>
  
  #if GNULIB_MCEL_PREFER
  # include "mcel.h"
  #else
  # include "mbuiterf.h"
  #endif
  
  /* Compare the character strings S1 and S2, ignoring case, returning less than,
     equal to or greater than zero if S1 is lexicographically less than, equal to
     or greater than S2.
     Note: This function may, in multibyte locales, return 0 for strings of
     different lengths!  */
  int
  mbscasecmp (const char *s1, const char *s2)
  {
    if (s1 == s2)
      return 0;
  
    const char *iter1 = s1;
    const char *iter2 = s2;
  
    /* Be careful not to look at the entire extent of s1 or s2 until needed.
       This is useful because when two strings differ, the difference is
       most often already in the very few first characters.  */
    if (MB_CUR_MAX > 1)
      {
  #if GNULIB_MCEL_PREFER
        while (true)
          {
            mcel_t g1 = mcel_scanz (iter1); iter1 += g1.len;
            mcel_t g2 = mcel_scanz (iter2); iter2 += g2.len;
            int cmp = mcel_tocmp (c32tolower, g1, g2);
            if (cmp | !g1.ch)
              return cmp;
          }
  #else
        mbuif_state_t state1;
        mbuif_init (state1);
  
        mbuif_state_t state2;
        mbuif_init (state2);
  
        while (mbuif_avail (state1, iter1) && mbuif_avail (state2, iter2))
          {
            mbchar_t cur1 = mbuif_next (state1, iter1);
            mbchar_t cur2 = mbuif_next (state2, iter2);
            int cmp = mb_casecmp (cur1, cur2);
  
            if (cmp != 0)
              return cmp;
  
            iter1 += mb_len (cur1);
            iter2 += mb_len (cur2);
          }
        if (mbuif_avail (state1, iter1))
          /* s2 terminated before s1.  */
          return 1;
        if (mbuif_avail (state2, iter2))
          /* s1 terminated before s2.  */
          return -1;
        return 0;
  #endif
      }
    else
      for (;;)
        {
          unsigned char c1 = *iter1++;
          unsigned char c2 = *iter2++;
          /* On machines where 'char' and 'int' are types of the same size, the
             difference of two 'unsigned char' values - including the sign bit -
             doesn't fit in an 'int'.  */
          int cmp = UCHAR_MAX <= INT_MAX ? c1 - c2 : _GL_CMP (c1, c2);
          if (cmp != 0)
            {
              c1 = tolower (c1);
              if (c1 == c2)
                cmp = 0;
              else
                {
                  c2 = tolower (c2);
                  cmp = UCHAR_MAX <= INT_MAX ? c1 - c2 : _GL_CMP (c1, c2);
                }
            }
          if (cmp | !c1)
            return cmp;
        }
  }
  

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