1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)strncmp.c 8.1 (Berkeley) 06/04/93"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/cdefs.h> 13 #include <string.h> 14 15 int 16 strncmp(s1, s2, n) 17 register const char *s1, *s2; 18 register size_t n; 19 { 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); 30 } 31