1: /* Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999, 2001, 2005
    2:    Free Software Foundation, Inc.
    3:    This file is part of the GNU C Library.
    4: 
    5:    The GNU C Library is free software; you can redistribute it and/or
    6:    modify it under the terms of the GNU Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the License, or (at your option) any later version.
    9: 
   10:    The GNU C Library is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.  */
   19: 
   20: #include "libioP.h"
   21: #include <wchar.h>
   22: #include <sys/param.h>
   23: 
   24: wchar_t *
   25: __fgetws_chk (wchar_t *buf, size_t size, int n, _IO_FILE *fp)
   26: {
   27:   _IO_size_t count;
   28:   wchar_t *result;
   29:   int old_error;
   30:   CHECK_FILE (fp, NULL);
   31:   if (n <= 0)
   32:     return NULL;
   33:   _IO_acquire_lock (fp);
   34:   /* This is very tricky since a file descriptor may be in the
   35:      non-blocking mode. The error flag doesn't mean much in this
   36:      case. We return an error only when there is a new error. */
   37:   old_error = fp->_IO_file_flags & _IO_ERR_SEEN;
   38:   fp->_IO_file_flags &= ~_IO_ERR_SEEN;
   39:   count = _IO_getwline (fp, buf, MIN ((size_t) n - 1, size), L'\n', 1);
   40:   /* If we read in some bytes and errno is EAGAIN, that error will
   41:      be reported for next read. */
   42:   if (count == 0 || (_IO_ferror_unlocked (fp) && errno != EAGAIN))
   43:     result = NULL;
   44:   else if (count >= size)
   45:     __chk_fail ();
   46:   else
   47:     {
   48:       buf[count] = '\0';
   49:       result = buf;
   50:     }
   51:   fp->_IO_file_flags |= old_error;
   52:   _IO_release_lock (fp);
   53:   return result;
   54: }