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/* ========================================================================
* Copyright 1988-2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: Substring search
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
*
* Date: 11 May 1989
* Last Edited: 30 August 2006
*/
/* Return pointer to first occurance in string of a substring
* Accepts: source pointer
* substring pointer
* Returns: pointer to substring in source or NIL if not found
*/
char *strstr (char *cs,char *ct)
{
char *s;
char *t;
while (cs = strchr (cs,*ct)) {/* for each occurance of the first character */
/* see if remainder of string matches */
for (s = cs + 1, t = ct + 1; *t && *s == *t; s++, t++);
if (!*t) return cs; /* if ran out of substring then have match */
cs++; /* try from next character */
}
return NIL; /* not found */
}
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