src/external/heimdal/roken/strlcat.c

   1 /*
   2  * Copyright (c) 1995-2002 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <config.h>
  35 #include "roken.h"
  36
  37 #ifndef HAVE_STRLCAT
  38
  39 ROKEN_LIB_FUNCTION size_t ROKEN_LIB_CALL
  40 strlcat (char *dst, const char *src, size_t dst_sz)
  41 {
  42     size_t len;
  43 #if defined(_MSC_VER) && _MSC_VER >= 1400
  44     len = strnlen_s(dst, dst_sz);
  45 #elif defined(HAVE_STRNLEN)
  46     len = strnlen(dst, dst_sz);
  47 #else
  48     len = strlen(dst);
  49 #endif
  50
  51     if (dst_sz <= len)
  52         /* the total size of dst is less than the string it contains;
  53            this could be considered bad input, but we might as well
  54            handle it */
  55         return len + strlen(src);
  56
  57     return len + strlcpy (dst + len, src, dst_sz - len);
  58 }
  59
  60 #endif