text: /*****************************************************************************
   * strnstr.c: BSD strnstr() replacement
   *****************************************************************************
   * Copyright © 2015 VLC authors and VideoLAN
   *
   * This program 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 2.1 of the License, or
   * (at your option) any later version.
   *
   * This program 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, write to the Free Software Foundation,
   * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
   *****************************************************************************/
  
  #ifdef HAVE_CONFIG_H
  # include <config.h>
  #endif
  
  #include <string.h>
  #include <assert.h>
  
  char * strnstr (const char *haystack, const char *needle, size_t len)
  {
      assert(needle != NULL);
  
      const size_t i = strlen(needle);
      if (i == 0) /* corner case (if haystack is NULL, memcmp not allowed) */
          return (char *)haystack;
  
      if( len < i )
        return NULL;
  
      size_t count = len - i;
  
      do
      {
        if( memcmp(haystack, needle, i) == 0 )
          return (char*) haystack;
        haystack++;
      }
      while(count--);
  
      return NULL;
  }
  