/* * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* Copyright (c) 1992, 1997 NeXT Software, Inc. All rights reserved. * * File: libc/gen/ppc/strncmp.c * * This file contains machine dependent code for string comparison * * HISTORY * 24-Jan-1997 Umesh Vaishampayan (umeshv@NeXT.com) * Ported to PPC. * 24-Nov-92 Derek B Clegg (dclegg@next.com) * Created. */ #import <string.h> /* This routine should be optimized. */ /* ANSI sez: * The `strncmp' function compares not more than `n' characters (characters * that follow a null character are not compared) from the array pointed to * by `s1' to the array pointed to by `s2'. * The `strncmp' function returns an integer greater than, equal to, or less * than zero, according as the possibly null-terminated array pointed to by * `s1' is greater than, equal to, or less than the possibly null-terminated * array pointed to by `s2'. [4.11.4.4] */ int strncmp(const char *s1, const char *s2, size_t n) { for ( ; n > 0; s1++, s2++, --n) if (*s1 != *s2) return ((*(unsigned char *)s1 < *(unsigned char *)s2) ? -1 : +1); else if (*s1 == '\0') return 0; return 0; }