usr/src/lib/libbc/libc/gen/common/strncat.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1990 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * Concatenate s2 on the end of s1.  S1's space must be large enough.
  31  * At most n characters are moved.
  32  * Return s1.
  33  */
  34
  35 char *
  36 strncat(char *s1, char *s2, int n)
  37 {
  38         char *os1;
  39
  40         os1 = s1;
  41         while (*s1++)
  42                 ;
  43         --s1;
  44         while (*s1++ = *s2++)
  45                 if (--n < 0) {
  46                         *--s1 = '\0';
  47                         break;
  48                 }
  49         return (os1);
  50 }