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gcc/libgfortran/io/open.c

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/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
Contributed by Andy Vaught
F2003 I/O support contributed by Jerry DeLisle
This file is part of the GNU Fortran 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 3, 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "io.h"
#include "fbuf.h"
#include "unix.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#include <errno.h>
#include <stdlib.h>
static const st_option access_opt[] = {
{"sequential", ACCESS_SEQUENTIAL},
{"direct", ACCESS_DIRECT},
{"append", ACCESS_APPEND},
{"stream", ACCESS_STREAM},
{NULL, 0}
};
static const st_option action_opt[] =
{
{ "read", ACTION_READ},
{ "write", ACTION_WRITE},
{ "readwrite", ACTION_READWRITE},
{ NULL, 0}
};
static const st_option blank_opt[] =
{
{ "null", BLANK_NULL},
{ "zero", BLANK_ZERO},
{ NULL, 0}
};
static const st_option delim_opt[] =
{
{ "none", DELIM_NONE},
{ "apostrophe", DELIM_APOSTROPHE},
{ "quote", DELIM_QUOTE},
{ NULL, 0}
};
static const st_option form_opt[] =
{
{ "formatted", FORM_FORMATTED},
{ "unformatted", FORM_UNFORMATTED},
{ NULL, 0}
};
static const st_option position_opt[] =
{
{ "asis", POSITION_ASIS},
{ "rewind", POSITION_REWIND},
{ "append", POSITION_APPEND},
{ NULL, 0}
};
static const st_option status_opt[] =
{
{ "unknown", STATUS_UNKNOWN},
{ "old", STATUS_OLD},
{ "new", STATUS_NEW},
{ "replace", STATUS_REPLACE},
{ "scratch", STATUS_SCRATCH},
{ NULL, 0}
};
static const st_option pad_opt[] =
{
{ "yes", PAD_YES},
{ "no", PAD_NO},
{ NULL, 0}
};
static const st_option decimal_opt[] =
{
{ "point", DECIMAL_POINT},
{ "comma", DECIMAL_COMMA},
{ NULL, 0}
};
static const st_option encoding_opt[] =
{
{ "utf-8", ENCODING_UTF8},
{ "default", ENCODING_DEFAULT},
{ NULL, 0}
};
static const st_option round_opt[] =
{
{ "up", ROUND_UP},
{ "down", ROUND_DOWN},
{ "zero", ROUND_ZERO},
{ "nearest", ROUND_NEAREST},
{ "compatible", ROUND_COMPATIBLE},
{ "processor_defined", ROUND_PROCDEFINED},
{ NULL, 0}
};
static const st_option sign_opt[] =
{
{ "plus", SIGN_PLUS},
{ "suppress", SIGN_SUPPRESS},
{ "processor_defined", SIGN_PROCDEFINED},
{ NULL, 0}
};
static const st_option convert_opt[] =
{
{ "native", GFC_CONVERT_NATIVE},
{ "swap", GFC_CONVERT_SWAP},
{ "big_endian", GFC_CONVERT_BIG},
{ "little_endian", GFC_CONVERT_LITTLE},
{ NULL, 0}
};
static const st_option async_opt[] =
{
{ "yes", ASYNC_YES},
{ "no", ASYNC_NO},
{ NULL, 0}
};
/* Given a unit, test to see if the file is positioned at the terminal
point, and if so, change state from NO_ENDFILE flag to AT_ENDFILE.
This prevents us from changing the state from AFTER_ENDFILE to
AT_ENDFILE. */
static void
test_endfile (gfc_unit * u)
{
if (u->endfile == NO_ENDFILE)
{
gfc_offset sz = ssize (u->s);
if (sz == 0 || sz == stell (u->s))
u->endfile = AT_ENDFILE;
}
}
/* Change the modes of a file, those that are allowed * to be
changed. */
static void
edit_modes (st_parameter_open *opp, gfc_unit * u, unit_flags * flags)
{
/* Complain about attempts to change the unchangeable. */
if (flags->status != STATUS_UNSPECIFIED && flags->status != STATUS_OLD &&
u->flags.status != flags->status)
generate_error (&opp->common, LIBERROR_BAD_OPTION,
"Cannot change STATUS parameter in OPEN statement");
if (flags->access != ACCESS_UNSPECIFIED && u->flags.access != flags->access)
generate_error (&opp->common, LIBERROR_BAD_OPTION,
"Cannot change ACCESS parameter in OPEN statement");
if (flags->form != FORM_UNSPECIFIED && u->flags.form != flags->form)
generate_error (&opp->common, LIBERROR_BAD_OPTION,
"Cannot change FORM parameter in OPEN statement");
if ((opp->common.flags & IOPARM_OPEN_HAS_RECL_IN)
&& opp->recl_in != u->recl)
generate_error (&opp->common, LIBERROR_BAD_OPTION,
"Cannot change RECL parameter in OPEN statement");
if (flags->action != ACTION_UNSPECIFIED && u->flags.action != flags->action)
generate_error (&opp->common, LIBERROR_BAD_OPTION,
"Cannot change ACTION parameter in OPEN statement");
/* Status must be OLD if present. */
if (flags->status != STATUS_UNSPECIFIED && flags->status != STATUS_OLD &&
flags->status != STATUS_UNKNOWN)
{
if (flags->status == STATUS_SCRATCH)
notify_std (&opp->common, GFC_STD_GNU,
"OPEN statement must have a STATUS of OLD or UNKNOWN");
else
generate_error (&opp->common, LIBERROR_BAD_OPTION,
"OPEN statement must have a STATUS of OLD or UNKNOWN");
}
if (u->flags.form == FORM_UNFORMATTED)
{
if (flags->delim != DELIM_UNSPECIFIED)
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"DELIM parameter conflicts with UNFORMATTED form in "
"OPEN statement");
if (flags->blank != BLANK_UNSPECIFIED)
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"BLANK parameter conflicts with UNFORMATTED form in "
"OPEN statement");
if (flags->pad != PAD_UNSPECIFIED)
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"PAD parameter conflicts with UNFORMATTED form in "
"OPEN statement");
if (flags->decimal != DECIMAL_UNSPECIFIED)
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"DECIMAL parameter conflicts with UNFORMATTED form in "
"OPEN statement");
if (flags->encoding != ENCODING_UNSPECIFIED)
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"ENCODING parameter conflicts with UNFORMATTED form in "
"OPEN statement");
if (flags->round != ROUND_UNSPECIFIED)
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"ROUND parameter conflicts with UNFORMATTED form in "
"OPEN statement");
if (flags->sign != SIGN_UNSPECIFIED)
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"SIGN parameter conflicts with UNFORMATTED form in "
"OPEN statement");
}
if ((opp->common.flags & IOPARM_LIBRETURN_MASK) == IOPARM_LIBRETURN_OK)
{
/* Change the changeable: */
if (flags->blank != BLANK_UNSPECIFIED)
u->flags.blank = flags->blank;
if (flags->delim != DELIM_UNSPECIFIED)
u->flags.delim = flags->delim;
if (flags->pad != PAD_UNSPECIFIED)
u->flags.pad = flags->pad;
if (flags->decimal != DECIMAL_UNSPECIFIED)
u->flags.decimal = flags->decimal;
if (flags->encoding != ENCODING_UNSPECIFIED)
u->flags.encoding = flags->encoding;
if (flags->async != ASYNC_UNSPECIFIED)
u->flags.async = flags->async;
if (flags->round != ROUND_UNSPECIFIED)
u->flags.round = flags->round;
if (flags->sign != SIGN_UNSPECIFIED)
u->flags.sign = flags->sign;
/* Reposition the file if necessary. */
switch (flags->position)
{
case POSITION_UNSPECIFIED:
case POSITION_ASIS:
break;
case POSITION_REWIND:
if (sseek (u->s, 0, SEEK_SET) != 0)
goto seek_error;
u->current_record = 0;
u->last_record = 0;
test_endfile (u);
break;
case POSITION_APPEND:
if (sseek (u->s, 0, SEEK_END) < 0)
goto seek_error;
if (flags->access != ACCESS_STREAM)
u->current_record = 0;
u->endfile = AT_ENDFILE; /* We are at the end. */
break;
seek_error:
generate_error (&opp->common, LIBERROR_OS, NULL);
break;
}
}
unlock_unit (u);
}
/* Open an unused unit. */
gfc_unit *
new_unit (st_parameter_open *opp, gfc_unit *u, unit_flags * flags)
{
gfc_unit *u2;
stream *s;
char tmpname[5 /* fort. */ + 10 /* digits of unit number */ + 1 /* 0 */];
/* Change unspecifieds to defaults. Leave (flags->action ==
ACTION_UNSPECIFIED) alone so open_external() can set it based on
what type of open actually works. */
if (flags->access == ACCESS_UNSPECIFIED)
flags->access = ACCESS_SEQUENTIAL;
if (flags->form == FORM_UNSPECIFIED)
flags->form = (flags->access == ACCESS_SEQUENTIAL)
? FORM_FORMATTED : FORM_UNFORMATTED;
if (flags->async == ASYNC_UNSPECIFIED)
flags->async = ASYNC_NO;
if (flags->status == STATUS_UNSPECIFIED)
flags->status = STATUS_UNKNOWN;
/* Checks. */
if (flags->delim != DELIM_UNSPECIFIED
&& flags->form == FORM_UNFORMATTED)
{
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"DELIM parameter conflicts with UNFORMATTED form in "
"OPEN statement");
goto fail;
}
if (flags->blank == BLANK_UNSPECIFIED)
flags->blank = BLANK_NULL;
else
{
if (flags->form == FORM_UNFORMATTED)
{
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"BLANK parameter conflicts with UNFORMATTED form in "
"OPEN statement");
goto fail;
}
}
if (flags->pad == PAD_UNSPECIFIED)
flags->pad = PAD_YES;
else
{
if (flags->form == FORM_UNFORMATTED)
{
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"PAD parameter conflicts with UNFORMATTED form in "
"OPEN statement");
goto fail;
}
}
if (flags->decimal == DECIMAL_UNSPECIFIED)
flags->decimal = DECIMAL_POINT;
else
{
if (flags->form == FORM_UNFORMATTED)
{
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"DECIMAL parameter conflicts with UNFORMATTED form "
"in OPEN statement");
goto fail;
}
}
if (flags->encoding == ENCODING_UNSPECIFIED)
flags->encoding = ENCODING_DEFAULT;
else
{
if (flags->form == FORM_UNFORMATTED)
{
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"ENCODING parameter conflicts with UNFORMATTED form in "
"OPEN statement");
goto fail;
}
}
/* NB: the value for ROUND when it's not specified by the user does not
have to be PROCESSOR_DEFINED; the standard says that it is
processor dependent, and requires that it is one of the
possible value (see F2003, 9.4.5.13). */
if (flags->round == ROUND_UNSPECIFIED)
flags->round = ROUND_PROCDEFINED;
else
{
if (flags->form == FORM_UNFORMATTED)
{
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"ROUND parameter conflicts with UNFORMATTED form in "
"OPEN statement");
goto fail;
}
}
if (flags->sign == SIGN_UNSPECIFIED)
flags->sign = SIGN_PROCDEFINED;
else
{
if (flags->form == FORM_UNFORMATTED)
{
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"SIGN parameter conflicts with UNFORMATTED form in "
"OPEN statement");
goto fail;
}
}
if (flags->position != POSITION_ASIS && flags->access == ACCESS_DIRECT)
{
generate_error (&opp->common, LIBERROR_OPTION_CONFLICT,
"ACCESS parameter conflicts with SEQUENTIAL access in "
"OPEN statement");
goto fail;
}
else
if (flags->position == POSITION_UNSPECIFIED)
flags->position = POSITION_ASIS;
if (flags->access == ACCESS_DIRECT
&& (opp->common.flags & IOPARM_OPEN_HAS_RECL_IN) == 0)
{
generate_error (&opp->common, LIBERROR_MISSING_OPTION,
"Missing RECL parameter in OPEN statement");
goto fail;
}
if ((opp->common.flags & IOPARM_OPEN_HAS_RECL_IN) && opp->recl_in <= 0)
{
generate_error (&opp->common, LIBERROR_BAD_OPTION,
"RECL parameter is non-positive in OPEN statement");
goto fail;
}
switch (flags->status)
{
case STATUS_SCRATCH:
if ((opp->common.flags & IOPARM_OPEN_HAS_FILE) == 0)
{
opp->file = NULL;
break;
}
generate_error (&opp->common, LIBERROR_BAD_OPTION,
"FILE parameter must not be present in OPEN statement");
goto fail;
case STATUS_OLD:
case STATUS_NEW:
case STATUS_REPLACE:
case STATUS_UNKNOWN:
if ((opp->common.flags & IOPARM_OPEN_HAS_FILE))
break;
opp->file = tmpname;
opp->file_len = snprintf(opp->file, sizeof (tmpname), "fort.%d",
(int) opp->common.unit);
break;
default:
internal_error (&opp->common, "new_unit(): Bad status");
}
/* Make sure the file isn't already open someplace else.
Do not error if opening file preconnected to stdin, stdout, stderr. */
u2 = NULL;
if ((opp->common.flags & IOPARM_OPEN_HAS_FILE) != 0)
u2 = find_file (opp->file, opp->file_len);
if (u2 != NULL
&& (options.stdin_unit < 0 || u2->unit_number != options.stdin_unit)
&& (options.stdout_unit < 0 || u2->unit_number != options.stdout_unit)
&& (options.stderr_unit < 0 || u2->unit_number != options.stderr_unit))
{
unlock_unit (u2);
generate_error (&opp->common, LIBERROR_ALREADY_OPEN, NULL);
goto cleanup;
}
if (u2 != NULL)
unlock_unit (u2);
/* Open file. */
s = open_external (opp, flags);
if (s == NULL)
{
char errbuf[256];
char *path = fc_strdup (opp->file, opp->file_len);
size_t msglen = opp->file_len + 22 + sizeof (errbuf);
char *msg = xmalloc (msglen);
snprintf (msg, msglen, "Cannot open file '%s': %s", path,
gf_strerror (errno, errbuf, sizeof (errbuf)));
generate_error (&opp->common, LIBERROR_OS, msg);
free (msg);
free (path);
goto cleanup;
}
if (flags->status == STATUS_NEW || flags->status == STATUS_REPLACE)
flags->status = STATUS_OLD;
/* Create the unit structure. */
if (u->unit_number != opp->common.unit)
internal_error (&opp->common, "Unit number changed");
u->s = s;
u->flags = *flags;
u->read_bad = 0;
u->endfile = NO_ENDFILE;
u->last_record = 0;
u->current_record = 0;
u->mode = READING;
u->maxrec = 0;
u->bytes_left = 0;
u->saved_pos = 0;
if (flags->position == POSITION_APPEND)
{
if (sseek (u->s, 0, SEEK_END) < 0)
{
generate_error (&opp->common, LIBERROR_OS, NULL);
goto cleanup;
}
u->endfile = AT_ENDFILE;
}
/* Unspecified recl ends up with a processor dependent value. */
if ((opp->common.flags & IOPARM_OPEN_HAS_RECL_IN))
{
u->flags.has_recl = 1;
u->recl = opp->recl_in;
u->recl_subrecord = u->recl;
u->bytes_left = u->recl;
}
else
{
u->flags.has_recl = 0;
u->recl = max_offset;
if (compile_options.max_subrecord_length)
{
u->recl_subrecord = compile_options.max_subrecord_length;
}
else
{
switch (compile_options.record_marker)
{
case 0:
/* Fall through */
case sizeof (GFC_INTEGER_4):
u->recl_subrecord = GFC_MAX_SUBRECORD_LENGTH;
break;
case sizeof (GFC_INTEGER_8):
u->recl_subrecord = max_offset - 16;
break;
default:
runtime_error ("Illegal value for record marker");
break;
}
}
}
/* If the file is direct access, calculate the maximum record number
via a division now instead of letting the multiplication overflow
later. */
if (flags->access == ACCESS_DIRECT)
u->maxrec = max_offset / u->recl;
if (flags->access == ACCESS_STREAM)
{
u->maxrec = max_offset;
u->recl = 1;
u->bytes_left = 1;
u->strm_pos = stell (u->s) + 1;
}
u->filename = fc_strdup (opp->file, opp->file_len);
/* Curiously, the standard requires that the
position specifier be ignored for new files so a newly connected
file starts out at the initial point. We still need to figure
out if the file is at the end or not. */
test_endfile (u);
if (flags->status == STATUS_SCRATCH && opp->file != NULL)
free (opp->file);
if (flags->form == FORM_FORMATTED)
{
if ((opp->common.flags & IOPARM_OPEN_HAS_RECL_IN))
fbuf_init (u, u->recl);
else
fbuf_init (u, 0);
}
else
u->fbuf = NULL;
return u;
cleanup:
/* Free memory associated with a temporary filename. */
if (flags->status == STATUS_SCRATCH && opp->file != NULL)
free (opp->file);
fail:
close_unit (u);
return NULL;
}
/* Open a unit which is already open. This involves changing the
modes or closing what is there now and opening the new file. */
static void
already_open (st_parameter_open *opp, gfc_unit * u, unit_flags * flags)
{
if ((opp->common.flags & IOPARM_OPEN_HAS_FILE) == 0)
{
edit_modes (opp, u, flags);
return;
}
/* If the file is connected to something else, close it and open a
new unit. */
if (!compare_file_filename (u, opp->file, opp->file_len))
{
if (sclose (u->s) == -1)
{
unlock_unit (u);
generate_error (&opp->common, LIBERROR_OS,
"Error closing file in OPEN statement");
return;
}
u->s = NULL;
#if !HAVE_UNLINK_OPEN_FILE
if (u->filename && u->flags.status == STATUS_SCRATCH)
remove (u->filename);
#endif
free (u->filename);
u->filename = NULL;
u = new_unit (opp, u, flags);
if (u != NULL)
unlock_unit (u);
return;
}
edit_modes (opp, u, flags);
}
/* Open file. */
extern void st_open (st_parameter_open *opp);
export_proto(st_open);
void
st_open (st_parameter_open *opp)
{
unit_flags flags;
gfc_unit *u = NULL;
GFC_INTEGER_4 cf = opp->common.flags;
unit_convert conv;
library_start (&opp->common);
/* Decode options. */
flags.access = !(cf & IOPARM_OPEN_HAS_ACCESS) ? ACCESS_UNSPECIFIED :
find_option (&opp->common, opp->access, opp->access_len,
access_opt, "Bad ACCESS parameter in OPEN statement");
flags.action = !(cf & IOPARM_OPEN_HAS_ACTION) ? ACTION_UNSPECIFIED :
find_option (&opp->common, opp->action, opp->action_len,
action_opt, "Bad ACTION parameter in OPEN statement");
flags.blank = !(cf & IOPARM_OPEN_HAS_BLANK) ? BLANK_UNSPECIFIED :
find_option (&opp->common, opp->blank, opp->blank_len,
blank_opt, "Bad BLANK parameter in OPEN statement");
flags.delim = !(cf & IOPARM_OPEN_HAS_DELIM) ? DELIM_UNSPECIFIED :
find_option (&opp->common, opp->delim, opp->delim_len,
delim_opt, "Bad DELIM parameter in OPEN statement");
flags.pad = !(cf & IOPARM_OPEN_HAS_PAD) ? PAD_UNSPECIFIED :
find_option (&opp->common, opp->pad, opp->pad_len,
pad_opt, "Bad PAD parameter in OPEN statement");
flags.decimal = !(cf & IOPARM_OPEN_HAS_DECIMAL) ? DECIMAL_UNSPECIFIED :
find_option (&opp->common, opp->decimal, opp->decimal_len,
decimal_opt, "Bad DECIMAL parameter in OPEN statement");
flags.encoding = !(cf & IOPARM_OPEN_HAS_ENCODING) ? ENCODING_UNSPECIFIED :
find_option (&opp->common, opp->encoding, opp->encoding_len,
encoding_opt, "Bad ENCODING parameter in OPEN statement");
flags.async = !(cf & IOPARM_OPEN_HAS_ASYNCHRONOUS) ? ASYNC_UNSPECIFIED :
find_option (&opp->common, opp->asynchronous, opp->asynchronous_len,
async_opt, "Bad ASYNCHRONOUS parameter in OPEN statement");
flags.round = !(cf & IOPARM_OPEN_HAS_ROUND) ? ROUND_UNSPECIFIED :
find_option (&opp->common, opp->round, opp->round_len,
round_opt, "Bad ROUND parameter in OPEN statement");
flags.sign = !(cf & IOPARM_OPEN_HAS_SIGN) ? SIGN_UNSPECIFIED :
find_option (&opp->common, opp->sign, opp->sign_len,
sign_opt, "Bad SIGN parameter in OPEN statement");
flags.form = !(cf & IOPARM_OPEN_HAS_FORM) ? FORM_UNSPECIFIED :
find_option (&opp->common, opp->form, opp->form_len,
form_opt, "Bad FORM parameter in OPEN statement");
flags.position = !(cf & IOPARM_OPEN_HAS_POSITION) ? POSITION_UNSPECIFIED :
find_option (&opp->common, opp->position, opp->position_len,
position_opt, "Bad POSITION parameter in OPEN statement");
flags.status = !(cf & IOPARM_OPEN_HAS_STATUS) ? STATUS_UNSPECIFIED :
find_option (&opp->common, opp->status, opp->status_len,
status_opt, "Bad STATUS parameter in OPEN statement");
/* First, we check wether the convert flag has been set via environment
variable. This overrides the convert tag in the open statement. */
conv = get_unformatted_convert (opp->common.unit);
if (conv == GFC_CONVERT_NONE)
{
/* Nothing has been set by environment variable, check the convert tag. */
if (cf & IOPARM_OPEN_HAS_CONVERT)
conv = find_option (&opp->common, opp->convert, opp->convert_len,
convert_opt,
"Bad CONVERT parameter in OPEN statement");
else
conv = compile_options.convert;
}
/* We use big_endian, which is 0 on little-endian machines
and 1 on big-endian machines. */
switch (conv)
{
case GFC_CONVERT_NATIVE:
case GFC_CONVERT_SWAP:
break;
case GFC_CONVERT_BIG:
conv = big_endian ? GFC_CONVERT_NATIVE : GFC_CONVERT_SWAP;
break;
case GFC_CONVERT_LITTLE:
conv = big_endian ? GFC_CONVERT_SWAP : GFC_CONVERT_NATIVE;
break;
default:
internal_error (&opp->common, "Illegal value for CONVERT");
break;
}
flags.convert = conv;
if (flags.position != POSITION_UNSPECIFIED
&& flags.access == ACCESS_DIRECT)
generate_error (&opp->common, LIBERROR_BAD_OPTION,
"Cannot use POSITION with direct access files");
if (flags.access == ACCESS_APPEND)
{
if (flags.position != POSITION_UNSPECIFIED
&& flags.position != POSITION_APPEND)
generate_error (&opp->common, LIBERROR_BAD_OPTION,
"Conflicting ACCESS and POSITION flags in"
" OPEN statement");
notify_std (&opp->common, GFC_STD_GNU,
"Extension: APPEND as a value for ACCESS in OPEN statement");
flags.access = ACCESS_SEQUENTIAL;
flags.position = POSITION_APPEND;
}
if (flags.position == POSITION_UNSPECIFIED)
flags.position = POSITION_ASIS;
if ((opp->common.flags & IOPARM_LIBRETURN_MASK) == IOPARM_LIBRETURN_OK)
{
if ((opp->common.flags & IOPARM_OPEN_HAS_NEWUNIT))
opp->common.unit = get_unique_unit_number(&opp->common);
else if (opp->common.unit < 0)
{
u = find_unit (opp->common.unit);
if (u == NULL) /* Negative unit and no NEWUNIT-created unit found. */
{
generate_error (&opp->common, LIBERROR_BAD_OPTION,
"Bad unit number in OPEN statement");
library_end ();
return;
}
}
if (u == NULL)
u = find_or_create_unit (opp->common.unit);
if (u->s == NULL)
{
u = new_unit (opp, u, &flags);
if (u != NULL)
unlock_unit (u);
}
else
already_open (opp, u, &flags);
}
if ((opp->common.flags & IOPARM_OPEN_HAS_NEWUNIT)
&& (opp->common.flags & IOPARM_LIBRETURN_MASK) == IOPARM_LIBRETURN_OK)
*opp->newunit = opp->common.unit;
library_end ();
}
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