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-rw-r--r--libio/ioftell.c47
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diff --git a/libio/ioftell.c b/libio/ioftell.c
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+/*
+Copyright (C) 1993, 1995 Free Software Foundation
+
+This file is part of the GNU IO Library. This library is free
+software; you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this library; see the file COPYING. If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+As a special exception, if you link this library with files
+compiled with a GNU compiler to produce an executable, this does not cause
+the resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why
+the executable file might be covered by the GNU General Public License. */
+
+#include "libioP.h"
+#include <errno.h>
+/* ANSI explicily requires setting errno to a positive value on failure. */
+
+long int
+_IO_ftell (fp)
+ _IO_FILE* fp;
+{
+ _IO_pos_t pos;
+ CHECK_FILE (fp, -1L);
+ pos = _IO_seekoff (fp, 0, _IO_seek_cur, 0);
+ if (pos == _IO_pos_BAD)
+ {
+#ifdef EIO
+ if (errno == 0)
+ errno = EIO;
+#endif
+ return -1L;
+ }
+ return _IO_pos_as_off (pos);
+}
+
+weak_alias (_IO_ftell, ftell)