text: /******************************************************************************
   * Copyright (c) 2004, 2008 IBM Corporation
   * All rights reserved.
   * This program and the accompanying materials
   * are made available under the terms of the BSD License
   * which accompanies this distribution, and is available at
   * http://www.opensource.org/licenses/bsd-license.php
   *
   * Contributors:
   *     IBM Corporation - initial implementation
   *****************************************************************************/
  
  #include <stddef.h>
  
  size_t strlen(const char *s);
  int strncmp(const char *s1, const char *s2, size_t n);
  char *strstr(const char *hay, const char *needle);
  char *strstr(const char *hay, const char *needle)
  {
  	char *pos;
  	size_t hlen, nlen;
  
  	if (hay == NULL || needle == NULL)
  		return NULL;
  	
  	hlen = strlen(hay);
  	nlen = strlen(needle);
  	if (nlen < 1)
  		return (char *)hay;
  
  	for (pos = (char *)hay; pos < hay + hlen; pos++) {
  		if (strncmp(pos, needle, nlen) == 0) {
  			return pos;
  		}
  	}
  
  	return NULL;
  }
  
  