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

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strncmp.c	5.6 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

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

int
strncmp(s1, s2, n)
	register const char *s1, *s2;
	register size_t n;
{

	if (n == 0)
		return (0);
	do {
		if (*s1 != *s2++)
			return (*(unsigned char *)s1 - *(unsigned char *)--s2);
		if (*s1++ == 0)
			break;
	} while (--n != 0);
	return (0);
}
Commit	Line	Data
7db9433a	1	/*
6c685f97	2	* Copyright (c) 1989 The Regents of the University of California.
7291c5cf KB	3	* All rights reserved.
7291c5cf KB	4	*
019bea33	5	* %sccs.include.redist.c%
7db9433a BJ	6	*/
7db9433a BJ	7
7291c5cf	8	#if defined(LIBC_SCCS) && !defined(lint)
a64329b4	9	static char sccsid[] = "@(#)strncmp.c 5.6 (Berkeley) %G%";
7291c5cf	10	#endif /* LIBC_SCCS and not lint */
7db9433a	11
a64329b4	12	#include <sys/cdefs.h>
6c685f97 KB	13	#include <string.h>
	14
	15	int
	16	strncmp(s1, s2, n)
	17	register const char s1, s2;
	18	register size_t n;
7291c5cf	19	{
6c685f97 KB	20
	21	if (n == 0)
	22	return (0);
	23	do {
	24	if (s1 != s2++)
	25	return ((unsigned char )s1 - (unsigned char )--s2);
	26	if (*s1++ == 0)
	27	break;
	28	} while (--n != 0);
	29	return (0);
7db9433a	30	}