| 1 | /* |
| 2 | * Copyright (c) 1989 The Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * %sccs.include.redist.c% |
| 6 | */ |
| 7 | |
| 8 | #if defined(LIBC_SCCS) && !defined(lint) |
| 9 | static char sccsid[] = "@(#)strncmp.c 5.6 (Berkeley) %G%"; |
| 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 | } |