projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| e9ce8d39 A |
1 | /* |
| 2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * The contents of this file constitute Original Code as defined in and | |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the | |
| 8 | * "License"). You may not use this file except in compliance with the | |
| 9 | * License. Please obtain a copy of the License at | |
| 10 | * http://www.apple.com/publicsource and read it before using this file. | |
| 11 | * | |
| 12 | * This Original Code and all software distributed under the License are | |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the | |
| 17 | * License for the specific language governing rights and limitations | |
| 18 | * under the License. | |
| 19 | * | |
| 20 | * @APPLE_LICENSE_HEADER_END@ | |
| 21 | */ | |
| 22 | /* Copyright (c) 1992, 1997 NeXT Software, Inc. All rights reserved. | |
| 23 | * | |
| 24 | * File: libc/gen/ppc/strncmp.c | |
| 25 | * | |
| 26 | * This file contains machine dependent code for string comparison | |
| 27 | * | |
| 28 | * HISTORY | |
| 29 | * 24-Jan-1997 Umesh Vaishampayan (umeshv@NeXT.com) | |
| 30 | * Ported to PPC. | |
| 31 | * 24-Nov-92 Derek B Clegg (dclegg@next.com) | |
| 32 | * Created. | |
| 33 | */ | |
| 34 | #import <string.h> | |
| 35 | ||
| 36 | /* This routine should be optimized. */ | |
| 37 | ||
| 38 | /* ANSI sez: | |
| 39 | * The `strncmp' function compares not more than `n' characters (characters | |
| 40 | * that follow a null character are not compared) from the array pointed to | |
| 41 | * by `s1' to the array pointed to by `s2'. | |
| 42 | * The `strncmp' function returns an integer greater than, equal to, or less | |
| 43 | * than zero, according as the possibly null-terminated array pointed to by | |
| 44 | * `s1' is greater than, equal to, or less than the possibly null-terminated | |
| 45 | * array pointed to by `s2'. [4.11.4.4] | |
| 46 | */ | |
| 47 | int | |
| 48 | strncmp(const char *s1, const char *s2, size_t n) | |
| 49 | { | |
| 50 | for ( ; n > 0; s1++, s2++, --n) | |
| 51 | if (*s1 != *s2) | |
| 52 | return ((*(unsigned char *)s1 < *(unsigned char *)s2) ? -1 : +1); | |
| 53 | else if (*s1 == '\0') | |
| 54 | return 0; | |
| 55 | return 0; | |
| 56 | } |