lib/libc/stdio/fgetwln.c

   1 /*      $NetBSD: fgetwln.c,v 1.2 2009/01/31 06:08:28 lukem Exp $        */
   2 /*      $DragonFly: src/lib/libc/stdio/fgetwln.c,v 1.1 2005/07/25 00:37:41 joerg Exp $ */
   3
   4 /*-
   5  * Copyright (c) 2002-2004 Tim J. Robbins.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  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  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include "namespace.h"
  31 #include <stdio.h>
  32 #include <wchar.h>
  33 #include "un-namespace.h"
  34
  35 #include "libc_private.h"
  36 #include "local.h"
  37 #include "priv_stdio.h"
  38
  39 wchar_t *
  40 fgetwln(FILE * __restrict fp, size_t *lenp)
  41 {
  42         wint_t wc;
  43         size_t len;
  44
  45         FLOCKFILE(fp);
  46         _SET_ORIENTATION(fp, 1);
  47
  48         len = 0;
  49         while ((wc = __fgetwc_unlock(fp)) != WEOF) {
  50 #define GROW    512
  51                 if (len * sizeof(wchar_t) >= (size_t)fp->_lb._size &&
  52                     __slbexpand(fp, (len + GROW) * sizeof(wchar_t)))
  53                         goto error;
  54                 *((wchar_t *)(void *)fp->_lb._base + len++) = wc;
  55                 if (wc == L'\n')
  56                         break;
  57         }
  58         if (len == 0)
  59                 goto error;
  60
  61         FUNLOCKFILE(fp);
  62         *lenp = len;
  63         return ((wchar_t *)(void *)fp->_lb._base);
  64
  65 error:
  66         FUNLOCKFILE(fp);
  67         *lenp = 0;
  68         return (NULL);
  69 }