[unix-history] / usr / src / lib / libc / string / strstr.c

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strstr.c	5.2 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/cdefs.h>
#include <string.h>

/*
 * Find the first occurrence of find in s.
 */
char *
strstr(s, find)
	register const char *s, *find;
{
	register char c, sc;
	register size_t len;

	if ((c = *find++) != 0) {
		len = strlen(find);
		do {
			do {
				if ((sc = *s++) == 0)
					return (NULL);
			} while (sc != c);
		} while (strncmp(s, find, len) != 0);
		s--;
	}
	return ((char *)s);
}
Commit	Line	Data
80aa332f KB	1	/*-
	2	* Copyright (c) 1990 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* Chris Torek.
	7	*
	8	* %sccs.include.redist.c%
	9	*/
	10
	11	#if defined(LIBC_SCCS) && !defined(lint)
a64329b4	12	static char sccsid[] = "@(#)strstr.c 5.2 (Berkeley) %G%";
80aa332f KB	13	#endif /* LIBC_SCCS and not lint */
80aa332f KB	14
a64329b4	15	#include <sys/cdefs.h>
80aa332f	16	#include <string.h>
80aa332f KB	17
	18	/*
	19	* Find the first occurrence of find in s.
	20	*/
	21	char *
	22	strstr(s, find)
	23	register const char s, find;
	24	{
	25	register char c, sc;
	26	register size_t len;
	27
	28	if ((c = *find++) != 0) {
	29	len = strlen(find);
	30	do {
	31	do {
	32	if ((sc = *s++) == 0)
	33	return (NULL);
	34	} while (sc != c);
	35	} while (strncmp(s, find, len) != 0);
	36	s--;
	37	}
	38	return ((char *)s);
	39	}