529 lines
12 KiB
C
529 lines
12 KiB
C
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/* 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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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 <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include "libgfortran.h"
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#include "io.h"
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static st_option access_opt[] = {
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{"sequential", ACCESS_SEQUENTIAL},
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{"direct", ACCESS_DIRECT},
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{NULL}
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}, action_opt[] =
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{
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{
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"read", ACTION_READ}
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,
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{
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"write", ACTION_WRITE}
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,
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{
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"readwrite", ACTION_READWRITE}
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,
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{
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NULL}
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}
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, blank_opt[] =
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{
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{
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"null", BLANK_NULL}
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,
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{
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"zero", BLANK_ZERO}
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,
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{
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NULL}
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}
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, delim_opt[] =
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{
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{
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"none", DELIM_NONE}
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,
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{
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"apostrophe", DELIM_APOSTROPHE}
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,
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{
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"quote", DELIM_QUOTE}
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,
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{
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NULL}
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}
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, form_opt[] =
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{
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{
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"formatted", FORM_FORMATTED}
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,
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{
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"unformatted", FORM_UNFORMATTED}
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,
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{
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NULL}
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}
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, position_opt[] =
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{
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{
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"asis", POSITION_ASIS}
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,
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{
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"rewind", POSITION_REWIND}
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,
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{
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"append", POSITION_APPEND}
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,
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{
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NULL}
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}
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, status_opt[] =
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{
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{
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"unknown", STATUS_UNKNOWN}
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,
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{
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"old", STATUS_OLD}
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,
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{
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"new", STATUS_NEW}
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,
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{
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"replace", STATUS_REPLACE}
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,
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{
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"scratch", STATUS_SCRATCH}
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,
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{
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NULL}
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}
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, pad_opt[] =
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{
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{
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"yes", PAD_YES}
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,
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{
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"no", PAD_NO}
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,
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{
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NULL}
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};
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/* test_endfile()-- Given a unit, test to see if the file is
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* positioned at the terminal point, and if so, change state from
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* NO_ENDFILE flag to AT_ENDFILE. This prevents us from changing the
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* state from AFTER_ENDFILE to AT_ENDFILE. */
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void
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test_endfile (gfc_unit * u)
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{
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if (u->endfile == NO_ENDFILE && file_length (u->s) == file_position (u->s))
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u->endfile = AT_ENDFILE;
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}
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/* edit_modes()-- Change the modes of a file, those that are allowed
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* to be changed. */
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static void
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edit_modes (gfc_unit * u, unit_flags * flags)
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{
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/* Complain about attempts to change the unchangeable */
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if (flags->status != STATUS_UNSPECIFIED &&
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u->flags.status != flags->position)
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generate_error (ERROR_BAD_OPTION,
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"Cannot change STATUS parameter in OPEN statement");
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if (flags->access != ACCESS_UNSPECIFIED && u->flags.access != flags->access)
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generate_error (ERROR_BAD_OPTION,
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"Cannot change ACCESS parameter in OPEN statement");
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if (flags->form != FORM_UNSPECIFIED && u->flags.form != flags->form)
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generate_error (ERROR_BAD_OPTION,
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"Cannot change FORM parameter in OPEN statement");
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if (ioparm.recl_in != 0 && ioparm.recl_in != u->recl)
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generate_error (ERROR_BAD_OPTION,
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"Cannot change RECL parameter in OPEN statement");
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if (flags->action != ACTION_UNSPECIFIED && u->flags.access != flags->access)
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generate_error (ERROR_BAD_OPTION,
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"Cannot change ACTION parameter in OPEN statement");
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/* Status must be OLD if present */
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if (flags->status != STATUS_UNSPECIFIED && flags->status != STATUS_OLD)
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generate_error (ERROR_BAD_OPTION,
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"OPEN statement must have a STATUS of OLD");
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if (u->flags.form == FORM_UNFORMATTED)
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{
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if (flags->delim != DELIM_UNSPECIFIED)
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generate_error (ERROR_OPTION_CONFLICT,
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"DELIM parameter conflicts with UNFORMATTED form in "
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"OPEN statement");
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if (flags->blank != BLANK_UNSPECIFIED)
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generate_error (ERROR_OPTION_CONFLICT,
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"BLANK parameter conflicts with UNFORMATTED form in "
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"OPEN statement");
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if (flags->pad != PAD_UNSPECIFIED)
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generate_error (ERROR_OPTION_CONFLICT,
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"PAD paramter conflicts with UNFORMATTED form in "
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"OPEN statement");
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}
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if (ioparm.library_return == LIBRARY_OK)
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{ /* Change the changeable */
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if (flags->blank != BLANK_UNSPECIFIED)
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u->flags.blank = flags->blank;
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if (flags->delim != DELIM_UNSPECIFIED)
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u->flags.delim = flags->delim;
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if (flags->pad != PAD_UNSPECIFIED)
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u->flags.pad = flags->pad;
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}
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/* Reposition the file if necessary. */
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switch (flags->position)
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{
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case POSITION_UNSPECIFIED:
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case POSITION_ASIS:
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break;
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case POSITION_REWIND:
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if (sseek (u->s, 0) == FAILURE)
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goto seek_error;
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u->current_record = 0;
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u->last_record = 0;
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test_endfile (u); /* We might be at the end */
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break;
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case POSITION_APPEND:
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if (sseek (u->s, file_length (u->s)) == FAILURE)
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goto seek_error;
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u->current_record = 0;
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u->endfile = AT_ENDFILE; /* We are at the end */
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break;
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seek_error:
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generate_error (ERROR_OS, NULL);
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break;
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}
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}
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/* new_unit()-- Open an unused unit */
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void
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new_unit (unit_flags * flags)
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{
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gfc_unit *u;
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stream *s;
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char tmpname[5 /* fort. */ + 10 /* digits of unit number */ + 1 /* 0 */];
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/* Change unspecifieds to defaults */
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if (flags->access == ACCESS_UNSPECIFIED)
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flags->access = ACCESS_SEQUENTIAL;
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if (flags->action == ACTION_UNSPECIFIED)
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flags->action = ACTION_READWRITE; /* Processor dependent */
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if (flags->form == FORM_UNSPECIFIED)
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flags->form = (flags->access == ACCESS_SEQUENTIAL)
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? FORM_FORMATTED : FORM_UNFORMATTED;
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if (flags->delim == DELIM_UNSPECIFIED)
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flags->delim = DELIM_NONE;
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else
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{
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if (flags->form == FORM_UNFORMATTED)
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{
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generate_error (ERROR_OPTION_CONFLICT,
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"DELIM parameter conflicts with UNFORMATTED form in "
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"OPEN statement");
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goto cleanup;
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}
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}
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if (flags->blank == BLANK_UNSPECIFIED)
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flags->blank = BLANK_NULL;
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else
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{
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if (flags->form == FORM_UNFORMATTED)
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{
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generate_error (ERROR_OPTION_CONFLICT,
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"BLANK parameter conflicts with UNFORMATTED form in "
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"OPEN statement");
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goto cleanup;
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}
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}
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if (flags->pad == PAD_UNSPECIFIED)
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flags->pad = PAD_YES;
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else
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{
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if (flags->form == FORM_UNFORMATTED)
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{
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generate_error (ERROR_OPTION_CONFLICT,
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"PAD paramter conflicts with UNFORMATTED form in "
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"OPEN statement");
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goto cleanup;
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}
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}
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if (flags->position != POSITION_ASIS && flags->access == ACCESS_DIRECT)
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{
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generate_error (ERROR_OPTION_CONFLICT,
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"ACCESS parameter conflicts with SEQUENTIAL access in "
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"OPEN statement");
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goto cleanup;
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}
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else
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if (flags->position == POSITION_UNSPECIFIED)
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flags->position = POSITION_ASIS;
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if (flags->status == STATUS_UNSPECIFIED)
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flags->status = STATUS_UNKNOWN;
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/* Checks */
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if (flags->access == ACCESS_DIRECT && ioparm.recl_in == 0)
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{
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generate_error (ERROR_MISSING_OPTION,
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"Missing RECL parameter in OPEN statement");
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goto cleanup;
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}
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if (ioparm.recl_in != 0 && ioparm.recl_in <= 0)
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{
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generate_error (ERROR_BAD_OPTION,
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"RECL parameter is non-positive in OPEN statement");
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goto cleanup;
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}
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switch (flags->status)
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{
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case STATUS_SCRATCH:
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if (ioparm.file == NULL)
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break;
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generate_error (ERROR_BAD_OPTION,
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"FILE parameter must not be present in OPEN statement");
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return;
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case STATUS_OLD:
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case STATUS_NEW:
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case STATUS_REPLACE:
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case STATUS_UNKNOWN:
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if (ioparm.file != NULL)
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break;
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ioparm.file = tmpname;
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ioparm.file_len = sprintf(ioparm.file, "fort.%d", ioparm.unit);
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break;
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default:
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internal_error ("new_unit(): Bad status");
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}
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/* Make sure the file isn't already open someplace else */
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if (find_file () != NULL)
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{
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generate_error (ERROR_ALREADY_OPEN, NULL);
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goto cleanup;
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}
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/* Open file */
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s = open_external (flags->action, flags->status);
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if (s == NULL)
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{
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generate_error (ERROR_OS, NULL);
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goto cleanup;
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}
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if (flags->status == STATUS_NEW || flags->status == STATUS_REPLACE)
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flags->status = STATUS_OLD;
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/* Create the unit structure */
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u = get_mem (sizeof (gfc_unit) + ioparm.file_len);
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u->unit_number = ioparm.unit;
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u->s = s;
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u->flags = *flags;
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/* Unspecified recl ends up with a processor dependent value */
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u->recl = (ioparm.recl_in != 0) ? ioparm.recl_in : DEFAULT_RECL;
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u->last_record = 0;
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u->current_record = 0;
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/* If the file is direct access, calculate the maximum record number
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* via a division now instead of letting the multiplication overflow
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* later. */
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if (flags->access == ACCESS_DIRECT)
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u->maxrec = g.max_offset / u->recl;
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memmove (u->file, ioparm.file, ioparm.file_len);
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u->file_len = ioparm.file_len;
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insert_unit (u);
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/* The file is now connected. Errors after this point leave the
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* file connected. Curiously, the standard requires that the
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* position specifier be ignored for new files so a newly connected
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* file starts out that the initial point. We still need to figure
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* out if the file is at the end or not. */
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test_endfile (u);
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cleanup:
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/* Free memory associated with a temporary filename */
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if (flags->status == STATUS_SCRATCH)
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free_mem (ioparm.file);
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}
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/* already_open()-- Open a unit which is already open. This involves
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* changing the modes or closing what is there now and opening the new
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* file. */
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static void
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already_open (gfc_unit * u, unit_flags * flags)
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{
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if (ioparm.file == NULL)
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{
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edit_modes (u, flags);
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return;
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}
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/* If the file is connected to something else, close it and open a
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* new unit */
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if (!compare_file_filename (u->s, ioparm.file, ioparm.file_len))
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{
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if (close_unit (u))
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{
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generate_error (ERROR_OS, "Error closing file in OPEN statement");
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return;
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}
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new_unit (flags);
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return;
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}
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edit_modes (u, flags);
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}
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/*************/
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/* open file */
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void
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st_open (void)
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{
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unit_flags flags;
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gfc_unit *u = NULL;
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library_start ();
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/* Decode options */
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flags.access = (ioparm.access == NULL) ? ACCESS_UNSPECIFIED :
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find_option (ioparm.access, ioparm.access_len, access_opt,
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"Bad ACCESS parameter in OPEN statement");
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flags.action = (ioparm.action == NULL) ? ACTION_UNSPECIFIED :
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find_option (ioparm.action, ioparm.action_len, action_opt,
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"Bad ACTION parameter in OPEN statement");
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flags.blank = (ioparm.blank == NULL) ? BLANK_UNSPECIFIED :
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find_option (ioparm.blank, ioparm.blank_len, blank_opt,
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"Bad BLANK parameter in OPEN statement");
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flags.delim = (ioparm.delim == NULL) ? DELIM_UNSPECIFIED :
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find_option (ioparm.delim, ioparm.delim_len, delim_opt,
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"Bad DELIM parameter in OPEN statement");
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flags.pad = (ioparm.pad == NULL) ? PAD_UNSPECIFIED :
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find_option (ioparm.pad, ioparm.pad_len, pad_opt,
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"Bad PAD parameter in OPEN statement");
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flags.form = (ioparm.form == NULL) ? FORM_UNSPECIFIED :
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find_option (ioparm.form, ioparm.form_len, form_opt,
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"Bad FORM parameter in OPEN statement");
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flags.position = (ioparm.position == NULL) ? POSITION_UNSPECIFIED :
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find_option (ioparm.position, ioparm.position_len, position_opt,
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"Bad POSITION parameter in OPEN statement");
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flags.status = (ioparm.status == NULL) ? STATUS_UNSPECIFIED :
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find_option (ioparm.status, ioparm.status_len, status_opt,
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"Bad STATUS parameter in OPEN statement");
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if (ioparm.unit < 0)
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generate_error (ERROR_BAD_OPTION, "Bad unit number in OPEN statement");
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if (flags.position != POSITION_UNSPECIFIED &&
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u->flags.access == ACCESS_DIRECT)
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generate_error (ERROR_BAD_OPTION,
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"Cannot use POSITION with direct access files");
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if (flags.position == POSITION_UNSPECIFIED)
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flags.position = POSITION_ASIS;
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if (ioparm.library_return != LIBRARY_OK)
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return;
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u = find_unit (ioparm.unit);
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if (u == NULL)
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new_unit (&flags);
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else
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already_open (u, &flags);
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library_end ();
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}
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