[C] strcpy source code

strcpy.c   [plain text]

/*
 * 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/strcpy.c
 *
 *  This file contains machine dependent code for string copy
 *
 * 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>

/* XXX This routine should be optimized. */

/* ANSI sez:
 *   The `strcpy' function copies the string pointed to by `s2' (including
 *   the terminating null character) into the array pointed to by `s1'.
 *   If copying takes place between objects that overlap, the behavior
 *   is undefined.
 *   The `strcpy' function returns the value of `s1'.  [4.11.2.3]
 */
char *
strcpy(char *s1, const char *s2)
{
    char *s = s1;    /* s1 assign address to s */
    while ((*s++ = *s2++) != 0)   /* s++ only the address of s plus one */
    ;
    return (s1);
}

Reference :

1. strcpy.c