ppc/gen/strncat.c

   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) 1991, 1997 NeXT Software, Inc.  All rights reserved.
  23  *
  24  *      File:   libc/gen/ppc/strncat.c
  25  *      Author: Mike DeMoney, NeXT Software, Inc.
  26  *
  27  *      This file contains machine dependent code for string copy
  28  *
  29  * HISTORY
  30  *  24-Jan-1997 Umesh Vaishampayan (umeshv@NeXT.com)
  31  *      Ported to PPC.
  32  * 23-Nov-92  Derek B Clegg (dclegg@next.com)
  33  *      Ported to m98k.
  34  *  4-Jun-91  Mike DeMoney (mike@next.com)
  35  *      Created.
  36  */
  37 #import <string.h>
  38
  39 char *
  40 strncat(char *s1, const char *s2, size_t n)
  41 {
  42     unsigned len1 = strlen(s1);
  43     unsigned len2 = strlen(s2);
  44
  45     if (len2 < n) {
  46         strcpy(&s1[len1], s2);
  47     } else {
  48         strncpy(&s1[len1], s2, n);
  49         s1[len1 + n] = '\0';
  50     }
  51     return s1;
  52 }