strstr.c
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strstr.c
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	/* Simple implementation of strstr for systems without it.
	This function is in the public domain. */

	/*

	@deftypefn Supplemental char* strstr (const char @var{string}, const char @var{sub})

	This function searches for the substring @var{sub} in the string
	@var{string}, not including the terminating null characters. A pointer
	to the first occurrence of @var{sub} is returned, or @code{NULL} if the
	substring is absent. If @var{sub} points to a string with zero
	length, the function returns @var{string}.

	@end deftypefn


	*/


	/* FIXME: The above description is ANSI compiliant. This routine has not
	been validated to comply with it. -fnf */

	#include "defines.h"

	char *
	rpl_strstr (const char s1, const char s2)
	{
	const char *p = s1;
	const size_t len = strlen (s2);

	for (; (p = strchr (p, *s2)) != 0; p++)
	{
	if (strncmp (p, s2, len) == 0)
	return (char *)p;
	}
	return (0);
	}