kc3-lang/gnulib/lib/mbs_endswith.c

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• Hash : f6afcbcc
  Author :
  Date : 2025-08-10T16:35:41
  

  Use standard way of including <config.h>.
  
  * lib/string-desc.c: Use normalized boilerplate.
  * lib/string-desc-contains.c: Likewise.
  * lib/str_startswith.c: Likewise.
  * lib/str_endswith.c: Likewise.
  * lib/mbs_endswith.c: Likewise.
  

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• lib/mbs_endswith.c

• /* mbs_endswith function.
     Copyright (C) 2025 Free Software Foundation, Inc.
  
     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/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2025.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <string.h>
  
  #include "mbiter.h"
  
  bool
  mbs_endswith (const char *string, const char *suffix)
  {
    if ((unsigned char) suffix[0] < 0x30)
      /* Some knowledge about the possible multibyte encodings:
  
         Encoding    First byte of character    Which of these can occur
                                                as second or later byte?
  
          EUC-JP     0x00..0x7F, 0x8E..0xFE     0xA1..0xFE
          EUC-KR     0x00..0x7F, 0xA1..0xFD     0xA1..0xFD
          GB2312     0x00..0x7F, 0xA1..0xF7     0xA1..0xF7
          EUC-TW     0x00..0x7F, 0x8E..0xFD     0xA1..0xFD
          BIG5       0x00..0x7F, 0xA1..0xF9     0x40..0x7E, 0xA1..0xF9
          GB18030    0x00..0x7F, 0x81..0xFE     0x30..0x39, 0x40..0x7E, 0x81..0xFE
          SJIS       0x00..0x7F, 0x81..0xF9     0x40..0x7E, 0x81..0xF9
          UTF-8      0x00..0x7F, 0xC2..0xF7     none
  
         Therefore, if the first byte of SUFFIX is < 0x30, it cannot occur as
         second or later byte, and therefore it is OK to do a bytewise search.  */
      return str_endswith (string, suffix);
  
    /* Here, suffix is not empty.  */
  
    size_t nbytes = strlen (string);
    if (nbytes >= strlen (suffix))
      {
        size_t len = mbslen (string);
        size_t n = mbslen (suffix);
        if (len >= n)
          {
            mbi_iterator_t iter;
            mbi_init (iter, string, nbytes);
            /* Advance past (len - n) multibyte characters.  */
            for (; len > n; len--)
              {
                if (!mbi_avail (iter))
                  /* We can get here due to incomplete multibyte characters.  */
                  return false;
                mbi_advance (iter);
              }
            if (!mbi_avail (iter))
              /* We can get here due to incomplete multibyte characters.  */
              return false;
            return strcmp (mbi_cur_ptr (iter), suffix) == 0;
          }
      }
    return false;
  }
  

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