9adcdfb365
* io/rewind.c (st_rewind): Flush the stream when resetting the mode
from WRITING to READING.
From-SVN: r98788
79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/* Copyright (C) 2002-2003 Free Software Foundation, Inc.
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Contributed by Andy Vaught
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This file is part of the GNU Fortran 95 runtime library (libgfortran).
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Libgfortran 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 2, or (at your option)
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any later version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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Libgfortran 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 Libgfortran; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include "libgfortran.h"
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#include "io.h"
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/* rewind.c-- Implement the rewind statement */
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extern void st_rewind (void);
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export_proto(st_rewind);
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void
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st_rewind (void)
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{
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gfc_unit *u;
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library_start ();
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u = find_unit (ioparm.unit);
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if (u != NULL)
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{
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if (u->flags.access != ACCESS_SEQUENTIAL)
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generate_error (ERROR_BAD_OPTION,
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"Cannot REWIND a file opened for DIRECT access");
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else
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{
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/* If we have been writing to the file, the last written record
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is the last record in the file, so truncate the file now.
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Reset to read mode so two consecutive rewind statements
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don't delete the file contents. Flush buffer when switching
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mode. */
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if (u->mode == WRITING)
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{
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flush (u->s);
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struncate (u->s);
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}
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u->mode = READING;
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u->last_record = 0;
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if (sseek (u->s, 0) == FAILURE)
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generate_error (ERROR_OS, NULL);
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u->endfile = NO_ENDFILE;
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u->current_record = 0;
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test_endfile (u);
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}
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/* update position for INQUIRE */
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u->flags.position = POSITION_REWIND;
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}
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library_end ();
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}
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