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−/* An ftello() function that works around platform bugs.
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−   Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
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−
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−   This program is free software: you can redistribute it and/or modify
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−   it under the terms of the GNU General Public License as published by
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−   the Free Software Foundation; either version 3 of the License, or
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−   (at your option) any later version.
+
−
+
−   This program is distributed in the hope that it will be useful,
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−   but WITHOUT ANY WARRANTY; without even the implied warranty of
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−   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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−   GNU General Public License for more details.
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−
+
−   You should have received a copy of the GNU General Public License
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−   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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−
+
−#include <config.h>
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−
+
−/* Specification.  */
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−#include <stdio.h>
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−
+
−/* Get lseek.  */
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−#include <unistd.h>
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−
+
−#include "stdio-impl.h"
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−
+
−off_t
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−ftello (FILE *fp)
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−#undef ftello
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−#if !HAVE_FTELLO
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−# undef ftell
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−# define ftello ftell
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−#endif
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−{
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−#if LSEEK_PIPE_BROKEN
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−  /* mingw gives bogus answers rather than failure on non-seekable files.  */
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−  if (lseek (fileno (fp), 0, SEEK_CUR) == -1)
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−    return -1;
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−#endif
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−
+
−#if FTELLO_BROKEN_AFTER_SWITCHING_FROM_READ_TO_WRITE /* Solaris */
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−  /* The Solaris stdio leaves the _IOREAD flag set after reading from a file
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−     reaches EOF and the program then starts writing to the file.  ftello
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−     gets confused by this.  */
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−  if (fp_->_flag & _IOWRT)
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−    {
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−      off_t pos;
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−
+
−      /* Call ftello nevertheless, for the side effects that it does on fp.  */
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−      ftello (fp);
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−
+
−      /* Compute the file position ourselves.  */
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−      pos = lseek (fileno (fp), (off_t) 0, SEEK_CUR);
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−      if (pos >= 0)
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−        {
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−          if ((fp_->_flag & _IONBF) == 0 && fp_->_base != NULL)
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−            pos += fp_->_ptr - fp_->_base;
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−        }
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−      return pos;
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−    }
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−#endif
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−
+
−#if defined __SL64 && defined __SCLE /* Cygwin */
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−  if ((fp->_flags & __SL64) == 0)
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−    {
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−      /* Cygwin 1.5.0 through 1.5.24 failed to open stdin in 64-bit
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−         mode; but has an ftello that requires 64-bit mode.  */
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−      FILE *tmp = fopen ("/dev/null", "r");
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−      if (!tmp)
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−        return -1;
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−      fp->_flags |= __SL64;
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−      fp->_seek64 = tmp->_seek64;
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−      fclose (tmp);
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−    }
+
−#endif
+
−  return ftello (fp);
+
−}