stdio/FreeBSD/fgetwln.c

   1 /*-
   2  * Copyright (c) 2002-2004 Tim J. Robbins.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD: src/lib/libc/stdio/fgetwln.c,v 1.2 2004/08/06 17:00:09 tjr Exp $");
  29
  30 #include "namespace.h"
  31 #include <stdio.h>
  32 #include <wchar.h>
  33 #include "un-namespace.h"
  34 #include "libc_private.h"
  35 #include "local.h"
  36
  37 wchar_t *
  38 fgetwln_l(FILE * __restrict fp, size_t *lenp, locale_t loc)
  39 {
  40         wint_t wc;
  41         size_t len;
  42
  43         FLOCKFILE(fp);
  44         ORIENT(fp, 1);
  45
  46         len = 0;
  47         while ((wc = __fgetwc(fp, loc)) != WEOF) {
  48 #define GROW    512
  49                 if (len * sizeof(wchar_t) >= fp->_lb._size &&
  50                     __slbexpand(fp, (len + GROW) * sizeof(wchar_t)))
  51                         goto error;
  52                 *((wchar_t *)fp->_lb._base + len++) = wc;
  53                 if (wc == L'\n')
  54                         break;
  55         }
  56         if (len == 0)
  57                 goto error;
  58
  59         FUNLOCKFILE(fp);
  60         *lenp = len;
  61         return ((wchar_t *)fp->_lb._base);
  62
  63 error:
  64         FUNLOCKFILE(fp);
  65         *lenp = 0;
  66         return (NULL);
  67 }
  68
  69 wchar_t *
  70 fgetwln(FILE * __restrict fp, size_t *lenp)
  71 {
  72         return fgetwln_l(fp, lenp, __current_locale());
  73 }