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  1. /*
  2. FUNCTION
  3.         <<wcslcpy>>---copy a wide-character string to specified length
  4.  
  5. ANSI_SYNOPSIS
  6.         #include <wchar.h>
  7.         size_t wcslcpy(wchar_t *<[dst]>, const wchar_t *<[src]>, size_t <[siz]>);
  8.  
  9. TRAD_SYNOPSIS
  10.         #include <wchar.h>
  11.         size_t wcslcpy(<[dst]>, <[src]>, <[siz]>)
  12.         wchar_t *<[dst]>;
  13.         const wchar_t *<[src]>;
  14.         size_t <[siz]>;
  15.  
  16. DESCRIPTION
  17.         <<wcslcpy>> copies wide characters from <[src]> to <[dst]>
  18.         such that up to <[siz]> - 1 characters are copied.  A
  19.         terminating null is appended to the result, unless <[siz]>
  20.         is zero.
  21.  
  22. RETURNS
  23.         <<wcslcpy>> returns the number of wide characters in <[src]>,
  24.         not including the terminating null wide character.  If the
  25.         return value is greater than or equal to <[siz]>, then
  26.         not all wide characters were copied from <[src]> and truncation
  27.         occurred.
  28.  
  29. PORTABILITY
  30. No supporting OS subroutines are required.
  31. */
  32.  
  33. /*      $NetBSD: wcslcpy.c,v 1.1 2000/12/23 23:14:36 itojun Exp $       */
  34. /*      from OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp   */
  35.  
  36. /*
  37.  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
  38.  * All rights reserved.
  39.  *
  40.  * Redistribution and use in source and binary forms, with or without
  41.  * modification, are permitted provided that the following conditions
  42.  * are met:
  43.  * 1. Redistributions of source code must retain the above copyright
  44.  *    notice, this list of conditions and the following disclaimer.
  45.  * 2. Redistributions in binary form must reproduce the above copyright
  46.  *    notice, this list of conditions and the following disclaimer in the
  47.  *    documentation and/or other materials provided with the distribution.
  48.  * 3. The name of the author may not be used to endorse or promote products
  49.  *    derived from this software without specific prior written permission.
  50.  *
  51.  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  52.  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  53.  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
  54.  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  55.  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  56.  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  57.  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  58.  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  59.  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  60.  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61.  */
  62.  
  63. #include <_ansi.h>
  64. #include <wchar.h>
  65.  
  66. /*
  67.  * Copy src to string dst of size siz.  At most siz-1 characters
  68.  * will be copied.  Always NUL terminates (unless siz == 0).
  69.  * Returns wcslen(src); if retval >= siz, truncation occurred.
  70.  */
  71. size_t
  72. _DEFUN (wcslcpy, (dst, src, siz),
  73.         wchar_t * dst _AND
  74.         _CONST wchar_t * src _AND
  75.         size_t siz)
  76. {
  77.   wchar_t *d = dst;
  78.   _CONST wchar_t *s = src;
  79.   size_t n = siz;
  80.  
  81.   /* Copy as many bytes as will fit */
  82.   if (n != 0 && --n != 0)
  83.     {
  84.       do
  85.         {
  86.           if ((*d++ = *s++) == 0)
  87.             break;
  88.         }
  89.       while (--n != 0);
  90.     }
  91.  
  92.   /* Not enough room in dst, add NUL and traverse rest of src */
  93.   if (n == 0)
  94.     {
  95.       if (siz != 0)
  96.         *d = '\0';              /* NUL-terminate dst */
  97.       while (*s++)
  98.         ;
  99.     }
  100.  
  101.   return (s - src - 1);         /* count does not include NUL */
  102. }
  103.