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glibc  2.9
wcsnlen.c
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00001 /* Copyright (C) 1998, 1999, 2007 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <wchar.h>
00021 
00022 
00023 /* Copy SRC to DEST.  */
00024 size_t
00025 __wcsnlen (s, maxlen)
00026      const wchar_t *s;
00027      size_t maxlen;
00028 {
00029   size_t len = 0;
00030 
00031   while (maxlen > 0 && s[len] != L'\0')
00032     {
00033       ++len;
00034       if (--maxlen == 0 || s[len] == L'\0')
00035        return len;
00036       ++len;
00037       if (--maxlen == 0 || s[len] == L'\0')
00038        return len;
00039       ++len;
00040       if (--maxlen == 0 || s[len] == L'\0')
00041        return len;
00042       ++len;
00043       --maxlen;
00044     }
00045 
00046   return len;
00047 }
00048 weak_alias (__wcsnlen, wcsnlen)