usr/src/lib/libc/port/gen/strlcpy.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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 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 #include "lint.h"
  30 #include <string.h>
  31 #include <sys/types.h>
  32
  33 /*
  34  * Copies src to the dstsize buffer at dst. The copy will never
  35  * overflow the destination buffer and the buffer will always be null
  36  * terminated.
  37  */
  38
  39 size_t
  40 strlcpy(char *dst, const char *src, size_t len)
  41 {
  42         size_t slen = strlen(src);
  43         size_t copied;
  44
  45         if (len == 0)
  46                 return (slen);
  47
  48         if (slen >= len)
  49                 copied = len - 1;
  50         else
  51                 copied = slen;
  52         (void) memcpy(dst, src, copied);
  53         dst[copied] = '\0';
  54         return (slen);
  55 }