mirror of git://gcc.gnu.org/git/gcc.git
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
|
|
/* Copyright (C) 2002-2003 Free Software Foundation, Inc.
|
|
Contributed by Andy Vaught
|
|
|
|
This file is part of the GNU Fortran 95 runtime library (libgfortran).
|
|
|
|
Libgfortran 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.
|
|
|
|
Libgfortran 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 Libgfortran; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include "config.h"
|
|
#include "libgfortran.h"
|
|
#include "io.h"
|
|
|
|
/* rewind.c-- Implement the rewind statement */
|
|
|
|
void
|
|
st_rewind (void)
|
|
{
|
|
gfc_unit *u;
|
|
|
|
library_start ();
|
|
|
|
u = find_unit (ioparm.unit);
|
|
if (u != NULL)
|
|
{
|
|
if (u->flags.access != ACCESS_SEQUENTIAL)
|
|
generate_error (ERROR_BAD_OPTION,
|
|
"Cannot REWIND a file opened for DIRECT access");
|
|
else
|
|
{
|
|
/* If we have been writing to the file, the last written record
|
|
is the last record in the file, so truncate the file now.
|
|
Reset to read mode so two consecutive rewind statements
|
|
don't delete the file contents. */
|
|
if (u->mode==WRITING)
|
|
struncate(u->s);
|
|
u->mode = READING;
|
|
u->last_record = 0;
|
|
if (sseek (u->s, 0) == FAILURE)
|
|
generate_error (ERROR_OS, NULL);
|
|
|
|
u->endfile = NO_ENDFILE;
|
|
u->current_record = 0;
|
|
test_endfile (u);
|
|
}
|
|
}
|
|
|
|
library_end ();
|
|
}
|