kc3-lang/gnulib/lib/wcsstr-impl.h

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• lib/wcsstr-impl.h

• /* Locate a substring in a wide string.
     Copyright (C) 1999, 2011-2023 Free Software Foundation, Inc.
     Written by Bruno Haible <bruno@clisp.org>, 1999.
  
     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/>.  */
  
  wchar_t *
  wcsstr (const wchar_t *haystack, const wchar_t *needle)
  {
    wchar_t n = needle[0];
  
    /* Is needle empty?  */
    if (n == (wchar_t)'\0')
      return (wchar_t *) haystack;
  
    /* Is needle nearly empty?  */
    if (needle[1] == (wchar_t)'\0')
      return wcschr (haystack, n);
  
    /* Search for needle's first character.  */
    for (; *haystack != (wchar_t)'\0'; haystack++)
      {
        if (*haystack == n)
          {
            /* Compare with needle's remaining characters.  */
            const wchar_t *hptr = haystack + 1;
            const wchar_t *nptr = needle + 1;
            for (;;)
              {
                if (*hptr != *nptr)
                  break;
                hptr++; nptr++;
                if (*nptr == (wchar_t)'\0')
                  return (wchar_t *) haystack;
              }
          }
      }
  
    return NULL;
  }
  

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