ppc/gen/strncat.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /* Copyright (c) 1991, 1997 NeXT Software, Inc.  All rights reserved.
  26  *
  27  *      File:   libc/gen/ppc/strncat.c
  28  *      Author: Mike DeMoney, NeXT Software, Inc.
  29  *
  30  *      This file contains machine dependent code for string copy
  31  *
  32  * HISTORY
  33  *  24-Jan-1997 Umesh Vaishampayan (umeshv@NeXT.com)
  34  *      Ported to PPC.
  35  * 23-Nov-92  Derek B Clegg (dclegg@next.com)
  36  *      Ported to m98k.
  37  *  4-Jun-91  Mike DeMoney (mike@next.com)
  38  *      Created.
  39  */
  40 #import <string.h>
  41
  42 char *
  43 strncat(char *s1, const char *s2, size_t n)
  44 {
  45     unsigned len1 = strlen(s1);
  46     unsigned len2 = strlen(s2);
  47
  48     if (len2 < n) {
  49         strcpy(&s1[len1], s2);
  50     } else {
  51         strncpy(&s1[len1], s2, n);
  52         s1[len1 + n] = '\0';
  53     }
  54     return s1;
  55 }