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/* Copyright (C) 2002, 2003, 2004, 2005
   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.
 
In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
compiled version of this file into combinations with other programs,
and to distribute those combinations without any restriction coming
from the use of this file.  (The General Public License restrictions
do apply in other respects; for example, they cover modification of
the file, and distribution when not linked into a combine
executable.)
 
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, 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */
 
#include "config.h"
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include "libgfortran.h"
#include "io.h"
 
 
static const st_option access_opt[] = {
  {"sequential", ACCESS_SEQUENTIAL},
  {"direct", ACCESS_DIRECT},
  {"append", ACCESS_APPEND},
  {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 convert_opt[] =
{
  { "native", CONVERT_NATIVE},
  { "swap", CONVERT_SWAP},
  { "big_endian", CONVERT_BIG},
  { "little_endian", CONVERT_LITTLE},
  { 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.  */
 
void
test_endfile (gfc_unit * u)
{
  if (u->endfile == NO_ENDFILE && file_length (u->s) == file_position (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 &&
      u->flags.status != flags->status)
    generate_error (&opp->common, ERROR_BAD_OPTION,
                    "Cannot change STATUS parameter in OPEN statement");
 
  if (flags->access != ACCESS_UNSPECIFIED && u->flags.access != flags->access)
    generate_error (&opp->common, ERROR_BAD_OPTION,
                    "Cannot change ACCESS parameter in OPEN statement");
 
  if (flags->form != FORM_UNSPECIFIED && u->flags.form != flags->form)
    generate_error (&opp->common, ERROR_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, ERROR_BAD_OPTION,
                    "Cannot change RECL parameter in OPEN statement");
 
  if (flags->action != ACTION_UNSPECIFIED && u->flags.access != flags->access)
    generate_error (&opp->common, ERROR_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)
    generate_error (&opp->common, ERROR_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, ERROR_OPTION_CONFLICT,
                        "DELIM parameter conflicts with UNFORMATTED form in "
                        "OPEN statement");
 
      if (flags->blank != BLANK_UNSPECIFIED)
        generate_error (&opp->common, ERROR_OPTION_CONFLICT,
                        "BLANK parameter conflicts with UNFORMATTED form in "
                        "OPEN statement");
 
      if (flags->pad != PAD_UNSPECIFIED)
        generate_error (&opp->common, ERROR_OPTION_CONFLICT,
                        "PAD paramter 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;
    }
 
  /* Reposition the file if necessary.  */
 
  switch (flags->position)
    {
    case POSITION_UNSPECIFIED:
    case POSITION_ASIS:
      break;
 
    case POSITION_REWIND:
      if (sseek (u->s, 0) == FAILURE)
        goto seek_error;
 
      u->current_record = 0;
      u->last_record = 0;
 
      test_endfile (u);         /* We might be at the end.  */
      break;
 
    case POSITION_APPEND:
      if (sseek (u->s, file_length (u->s)) == FAILURE)
        goto seek_error;
 
      u->current_record = 0;
      u->endfile = AT_ENDFILE;  /* We are at the end.  */
      break;
 
    seek_error:
      generate_error (&opp->common, ERROR_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->delim == DELIM_UNSPECIFIED)
    flags->delim = DELIM_NONE;
  else
    {
      if (flags->form == FORM_UNFORMATTED)
        {
          generate_error (&opp->common, ERROR_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, ERROR_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, ERROR_OPTION_CONFLICT,
                          "PAD paramter conflicts with UNFORMATTED form in "
                          "OPEN statement");
          goto fail;
        }
    }
 
  if (flags->position != POSITION_ASIS && flags->access == ACCESS_DIRECT)
   {
     generate_error (&opp->common, ERROR_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->status == STATUS_UNSPECIFIED)
    flags->status = STATUS_UNKNOWN;
 
  /* Checks.  */
 
  if (flags->access == ACCESS_DIRECT
      && (opp->common.flags & IOPARM_OPEN_HAS_RECL_IN) == 0)
    {
      generate_error (&opp->common, ERROR_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, ERROR_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, ERROR_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 = sprintf(opp->file, "fort.%d", 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, ERROR_ALREADY_OPEN, NULL);
      goto cleanup;
    }
 
  if (u2 != NULL)
    unlock_unit (u2);
 
  /* Open file.  */
 
  s = open_external (opp, flags);
  if (s == NULL)
    {
      generate_error (&opp->common, ERROR_OS, NULL);
      goto cleanup;
    }
 
  if (flags->status == STATUS_NEW || flags->status == STATUS_REPLACE)
    flags->status = STATUS_OLD;
 
  /* Create the unit structure.  */
 
  u->file = get_mem (opp->file_len);
  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;
 
  if (flags->position == POSITION_APPEND)
    {
      if (sseek (u->s, file_length (u->s)) == FAILURE)
        generate_error (&opp->common, ERROR_OS, NULL);
      u->endfile = AT_ENDFILE;
    }
 
  /* Unspecified recl ends up with a processor dependent value.  */
 
  if ((opp->common.flags & IOPARM_OPEN_HAS_RECL_IN))
    u->recl = opp->recl_in;
  else
    {
      switch (compile_options.record_marker)
        {
        case 0:
          u->recl = max_offset;
          break;
 
        case sizeof (GFC_INTEGER_4):
          u->recl = GFC_INTEGER_4_HUGE;
          break;
 
        case sizeof (GFC_INTEGER_8):
          u->recl = max_offset;
          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;
 
  memmove (u->file, opp->file, opp->file_len);
  u->file_len = opp->file_len;
 
  /* Curiously, the standard requires that the
     position specifier be ignored for new files so a newly connected
     file starts out that 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_mem (opp->file);
  return u;
 
 cleanup:
 
  /* Free memory associated with a temporary filename.  */
 
  if (flags->status == STATUS_SCRATCH && opp->file != NULL)
    free_mem (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 !HAVE_UNLINK_OPEN_FILE
      char *path = NULL;
      if (u->file && u->flags.status == STATUS_SCRATCH)
        {
          path = (char *) gfc_alloca (u->file_len + 1);
          unpack_filename (path, u->file, u->file_len);
        }
#endif
 
      if (sclose (u->s) == FAILURE)
        {
          unlock_unit (u);
          generate_error (&opp->common, ERROR_OS,
                          "Error closing file in OPEN statement");
          return;
        }
 
      u->s = NULL;
      if (u->file)
        free_mem (u->file);
      u->file = NULL;
      u->file_len = 0;
 
#if !HAVE_UNLINK_OPEN_FILE
      if (path != NULL)
        unlink (path);
#endif
 
      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.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 == 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 l8_to_l4_offset, which is 0 on little-endian machines
     and 1 on big-endian machines.  */
  switch (conv)
    {
    case CONVERT_NATIVE:
    case CONVERT_SWAP:
      break;
 
    case CONVERT_BIG:
      conv = l8_to_l4_offset ? CONVERT_NATIVE : CONVERT_SWAP;
      break;
 
    case CONVERT_LITTLE:
      conv = l8_to_l4_offset ? CONVERT_SWAP : CONVERT_NATIVE;
      break;
 
    default:
      internal_error (&opp->common, "Illegal value for CONVERT");
      break;
    }
 
  flags.convert = conv;
 
  if (opp->common.unit < 0)
    generate_error (&opp->common, ERROR_BAD_OPTION,
                    "Bad unit number in OPEN statement");
 
  if (flags.position != POSITION_UNSPECIFIED
      && flags.access == ACCESS_DIRECT)
    generate_error (&opp->common, ERROR_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, ERROR_BAD_OPTION,
                        "Conflicting ACCESS and POSITION flags in"
                        " OPEN statement");
 
      notify_std (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)
    {
      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);
    }
 
  library_end ();
}

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[/] [scarts/] [trunk/] [toolchain/] [scarts-gcc/] [gcc-4.1.1/] [libgfortran/] [io/] [open.c] - Blame information for rev 14

Line No.	Rev	Author	Line
1	14	jlechner	`/* Copyright (C) 2002, 2003, 2004, 2005`
2			`Free Software Foundation, Inc.`
3			`Contributed by Andy Vaught`
4
5			`This file is part of the GNU Fortran 95 runtime library (libgfortran).`
6
7			`Libgfortran is free software; you can redistribute it and/or modify`
8			`it under the terms of the GNU General Public License as published by`
9			`the Free Software Foundation; either version 2, or (at your option)`
10			`any later version.`
11
12			`In addition to the permissions in the GNU General Public License, the`
13			`Free Software Foundation gives you unlimited permission to link the`
14			`compiled version of this file into combinations with other programs,`
15			`and to distribute those combinations without any restriction coming`
16			`from the use of this file. (The General Public License restrictions`
17			`do apply in other respects; for example, they cover modification of`
18			`the file, and distribution when not linked into a combine`
19			`executable.)`
20
21			`Libgfortran is distributed in the hope that it will be useful,`
22			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
23			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
24			`GNU General Public License for more details.`
25
26			`You should have received a copy of the GNU General Public License`
27			`along with Libgfortran; see the file COPYING. If not, write to`
28			`the Free Software Foundation, 51 Franklin Street, Fifth Floor,`
29			`Boston, MA 02110-1301, USA. */`
30
31			`#include "config.h"`
32			`#include <unistd.h>`
33			`#include <stdio.h>`
34			`#include <string.h>`
35			`#include "libgfortran.h"`
36			`#include "io.h"`
37
38
39			`static const st_option access_opt[] = {`
40			`{"sequential", ACCESS_SEQUENTIAL},`
41			`{"direct", ACCESS_DIRECT},`
42			`{"append", ACCESS_APPEND},`
43			`{NULL, 0}`
44			`};`
45
46			`static const st_option action_opt[] =`
47			`{`
48			`{ "read", ACTION_READ},`
49			`{ "write", ACTION_WRITE},`
50			`{ "readwrite", ACTION_READWRITE},`
51			`{ NULL, 0}`
52			`};`
53
54			`static const st_option blank_opt[] =`
55			`{`
56			`{ "null", BLANK_NULL},`
57			`{ "zero", BLANK_ZERO},`
58			`{ NULL, 0}`
59			`};`
60
61			`static const st_option delim_opt[] =`
62			`{`
63			`{ "none", DELIM_NONE},`
64			`{ "apostrophe", DELIM_APOSTROPHE},`
65			`{ "quote", DELIM_QUOTE},`
66			`{ NULL, 0}`
67			`};`
68
69			`static const st_option form_opt[] =`
70			`{`
71			`{ "formatted", FORM_FORMATTED},`
72			`{ "unformatted", FORM_UNFORMATTED},`
73			`{ NULL, 0}`
74			`};`
75
76			`static const st_option position_opt[] =`
77			`{`
78			`{ "asis", POSITION_ASIS},`
79			`{ "rewind", POSITION_REWIND},`
80			`{ "append", POSITION_APPEND},`
81			`{ NULL, 0}`
82			`};`
83
84			`static const st_option status_opt[] =`
85			`{`
86			`{ "unknown", STATUS_UNKNOWN},`
87			`{ "old", STATUS_OLD},`
88			`{ "new", STATUS_NEW},`
89			`{ "replace", STATUS_REPLACE},`
90			`{ "scratch", STATUS_SCRATCH},`
91			`{ NULL, 0}`
92			`};`
93
94			`static const st_option pad_opt[] =`
95			`{`
96			`{ "yes", PAD_YES},`
97			`{ "no", PAD_NO},`
98			`{ NULL, 0}`
99			`};`
100
101			`static const st_option convert_opt[] =`
102			`{`
103			`{ "native", CONVERT_NATIVE},`
104			`{ "swap", CONVERT_SWAP},`
105			`{ "big_endian", CONVERT_BIG},`
106			`{ "little_endian", CONVERT_LITTLE},`
107			`{ NULL, 0}`
108			`};`
109
110			`/* Given a unit, test to see if the file is positioned at the terminal`
111			`point, and if so, change state from NO_ENDFILE flag to AT_ENDFILE.`
112			`This prevents us from changing the state from AFTER_ENDFILE to`
113			`AT_ENDFILE. */`
114
115			`void`
116			`test_endfile (gfc_unit * u)`
117			`{`
118			`if (u->endfile == NO_ENDFILE && file_length (u->s) == file_position (u->s))`
119			`u->endfile = AT_ENDFILE;`
120			`}`
121
122
123			`/* Change the modes of a file, those that are allowed * to be`
124			`changed. */`
125
126			`static void`
127			`edit_modes (st_parameter_open opp, gfc_unit u, unit_flags * flags)`
128			`{`
129			`/* Complain about attempts to change the unchangeable. */`
130
131			`if (flags->status != STATUS_UNSPECIFIED &&`
132			`u->flags.status != flags->status)`
133			`generate_error (&opp->common, ERROR_BAD_OPTION,`
134			`"Cannot change STATUS parameter in OPEN statement");`
135
136			`if (flags->access != ACCESS_UNSPECIFIED && u->flags.access != flags->access)`
137			`generate_error (&opp->common, ERROR_BAD_OPTION,`
138			`"Cannot change ACCESS parameter in OPEN statement");`
139
140			`if (flags->form != FORM_UNSPECIFIED && u->flags.form != flags->form)`
141			`generate_error (&opp->common, ERROR_BAD_OPTION,`
142			`"Cannot change FORM parameter in OPEN statement");`
143
144			`if ((opp->common.flags & IOPARM_OPEN_HAS_RECL_IN)`
145			`&& opp->recl_in != u->recl)`
146			`generate_error (&opp->common, ERROR_BAD_OPTION,`
147			`"Cannot change RECL parameter in OPEN statement");`
148
149			`if (flags->action != ACTION_UNSPECIFIED && u->flags.access != flags->access)`
150			`generate_error (&opp->common, ERROR_BAD_OPTION,`
151			`"Cannot change ACTION parameter in OPEN statement");`
152
153			`/* Status must be OLD if present. */`
154
155			`if (flags->status != STATUS_UNSPECIFIED && flags->status != STATUS_OLD &&`
156			`flags->status != STATUS_UNKNOWN)`
157			`generate_error (&opp->common, ERROR_BAD_OPTION,`
158			`"OPEN statement must have a STATUS of OLD or UNKNOWN");`
159
160			`if (u->flags.form == FORM_UNFORMATTED)`
161			`{`
162			`if (flags->delim != DELIM_UNSPECIFIED)`
163			`generate_error (&opp->common, ERROR_OPTION_CONFLICT,`
164			`"DELIM parameter conflicts with UNFORMATTED form in "`
165			`"OPEN statement");`
166
167			`if (flags->blank != BLANK_UNSPECIFIED)`
168			`generate_error (&opp->common, ERROR_OPTION_CONFLICT,`
169			`"BLANK parameter conflicts with UNFORMATTED form in "`
170			`"OPEN statement");`
171
172			`if (flags->pad != PAD_UNSPECIFIED)`
173			`generate_error (&opp->common, ERROR_OPTION_CONFLICT,`
174			`"PAD paramter conflicts with UNFORMATTED form in "`
175			`"OPEN statement");`
176			`}`
177
178			`if ((opp->common.flags & IOPARM_LIBRETURN_MASK) == IOPARM_LIBRETURN_OK)`
179			`{`
180			`/* Change the changeable: */`
181			`if (flags->blank != BLANK_UNSPECIFIED)`
182			`u->flags.blank = flags->blank;`
183			`if (flags->delim != DELIM_UNSPECIFIED)`
184			`u->flags.delim = flags->delim;`
185			`if (flags->pad != PAD_UNSPECIFIED)`
186			`u->flags.pad = flags->pad;`
187			`}`
188
189			`/* Reposition the file if necessary. */`
190
191			`switch (flags->position)`
192			`{`
193			`case POSITION_UNSPECIFIED:`
194			`case POSITION_ASIS:`
195			`break;`
196
197			`case POSITION_REWIND:`
198			`if (sseek (u->s, 0) == FAILURE)`
199			`goto seek_error;`
200
201			`u->current_record = 0;`
202			`u->last_record = 0;`
203
204			`test_endfile (u); /* We might be at the end. */`
205			`break;`
206
207			`case POSITION_APPEND:`
208			`if (sseek (u->s, file_length (u->s)) == FAILURE)`
209			`goto seek_error;`
210
211			`u->current_record = 0;`
212			`u->endfile = AT_ENDFILE; /* We are at the end. */`
213			`break;`
214
215			`seek_error:`
216			`generate_error (&opp->common, ERROR_OS, NULL);`
217			`break;`
218			`}`
219
220			`unlock_unit (u);`
221			`}`
222
223
224			`/* Open an unused unit. */`
225
226			`gfc_unit *`
227			`new_unit (st_parameter_open opp, gfc_unit u, unit_flags * flags)`
228			`{`
229			`gfc_unit *u2;`
230			`stream *s;`
231			`char tmpname[5 /* fort. / + 10 / digits of unit number / + 1 / 0 */];`
232
233			`/* Change unspecifieds to defaults. Leave (flags->action ==`
234			`ACTION_UNSPECIFIED) alone so open_external() can set it based on`
235			`what type of open actually works. */`
236
237			`if (flags->access == ACCESS_UNSPECIFIED)`
238			`flags->access = ACCESS_SEQUENTIAL;`
239
240			`if (flags->form == FORM_UNSPECIFIED)`
241			`flags->form = (flags->access == ACCESS_SEQUENTIAL)`
242			`? FORM_FORMATTED : FORM_UNFORMATTED;`
243
244
245			`if (flags->delim == DELIM_UNSPECIFIED)`
246			`flags->delim = DELIM_NONE;`
247			`else`
248			`{`
249			`if (flags->form == FORM_UNFORMATTED)`
250			`{`
251			`generate_error (&opp->common, ERROR_OPTION_CONFLICT,`
252			`"DELIM parameter conflicts with UNFORMATTED form in "`
253			`"OPEN statement");`
254			`goto fail;`
255			`}`
256			`}`
257
258			`if (flags->blank == BLANK_UNSPECIFIED)`
259			`flags->blank = BLANK_NULL;`
260			`else`
261			`{`
262			`if (flags->form == FORM_UNFORMATTED)`
263			`{`
264			`generate_error (&opp->common, ERROR_OPTION_CONFLICT,`
265			`"BLANK parameter conflicts with UNFORMATTED form in "`
266			`"OPEN statement");`
267			`goto fail;`
268			`}`
269			`}`
270
271			`if (flags->pad == PAD_UNSPECIFIED)`
272			`flags->pad = PAD_YES;`
273			`else`
274			`{`
275			`if (flags->form == FORM_UNFORMATTED)`
276			`{`
277			`generate_error (&opp->common, ERROR_OPTION_CONFLICT,`
278			`"PAD paramter conflicts with UNFORMATTED form in "`
279			`"OPEN statement");`
280			`goto fail;`
281			`}`
282			`}`
283
284			`if (flags->position != POSITION_ASIS && flags->access == ACCESS_DIRECT)`
285			`{`
286			`generate_error (&opp->common, ERROR_OPTION_CONFLICT,`
287			`"ACCESS parameter conflicts with SEQUENTIAL access in "`
288			`"OPEN statement");`
289			`goto fail;`
290			`}`
291			`else`
292			`if (flags->position == POSITION_UNSPECIFIED)`
293			`flags->position = POSITION_ASIS;`
294
295
296			`if (flags->status == STATUS_UNSPECIFIED)`
297			`flags->status = STATUS_UNKNOWN;`
298
299			`/* Checks. */`
300
301			`if (flags->access == ACCESS_DIRECT`
302			`&& (opp->common.flags & IOPARM_OPEN_HAS_RECL_IN) == 0)`
303			`{`
304			`generate_error (&opp->common, ERROR_MISSING_OPTION,`
305			`"Missing RECL parameter in OPEN statement");`
306			`goto fail;`
307			`}`
308
309			`if ((opp->common.flags & IOPARM_OPEN_HAS_RECL_IN) && opp->recl_in <= 0)`
310			`{`
311			`generate_error (&opp->common, ERROR_BAD_OPTION,`
312			`"RECL parameter is non-positive in OPEN statement");`
313			`goto fail;`
314			`}`
315
316			`switch (flags->status)`
317			`{`
318			`case STATUS_SCRATCH:`
319			`if ((opp->common.flags & IOPARM_OPEN_HAS_FILE) == 0)`
320			`{`
321			`opp->file = NULL;`
322			`break;`
323			`}`
324
325			`generate_error (&opp->common, ERROR_BAD_OPTION,`
326			`"FILE parameter must not be present in OPEN statement");`
327			`goto fail;`
328
329			`case STATUS_OLD:`
330			`case STATUS_NEW:`
331			`case STATUS_REPLACE:`
332			`case STATUS_UNKNOWN:`
333			`if ((opp->common.flags & IOPARM_OPEN_HAS_FILE))`
334			`break;`
335
336			`opp->file = tmpname;`
337			`opp->file_len = sprintf(opp->file, "fort.%d", opp->common.unit);`
338			`break;`
339
340			`default:`
341			`internal_error (&opp->common, "new_unit(): Bad status");`
342			`}`
343
344			`/* Make sure the file isn't already open someplace else.`
345			`Do not error if opening file preconnected to stdin, stdout, stderr. */`
346
347			`u2 = NULL;`
348			`if ((opp->common.flags & IOPARM_OPEN_HAS_FILE) != 0)`
349			`u2 = find_file (opp->file, opp->file_len);`
350			`if (u2 != NULL`
351			`&& (options.stdin_unit < 0 \|\| u2->unit_number != options.stdin_unit)`
352			`&& (options.stdout_unit < 0 \|\| u2->unit_number != options.stdout_unit)`
353			`&& (options.stderr_unit < 0 \|\| u2->unit_number != options.stderr_unit))`
354			`{`
355			`unlock_unit (u2);`
356			`generate_error (&opp->common, ERROR_ALREADY_OPEN, NULL);`
357			`goto cleanup;`
358			`}`
359
360			`if (u2 != NULL)`
361			`unlock_unit (u2);`
362
363			`/* Open file. */`
364
365			`s = open_external (opp, flags);`
366			`if (s == NULL)`
367			`{`
368			`generate_error (&opp->common, ERROR_OS, NULL);`
369			`goto cleanup;`
370			`}`
371
372			`if (flags->status == STATUS_NEW \|\| flags->status == STATUS_REPLACE)`
373			`flags->status = STATUS_OLD;`
374
375			`/* Create the unit structure. */`
376
377			`u->file = get_mem (opp->file_len);`
378			`if (u->unit_number != opp->common.unit)`
379			`internal_error (&opp->common, "Unit number changed");`
380			`u->s = s;`
381			`u->flags = *flags;`
382			`u->read_bad = 0;`
383			`u->endfile = NO_ENDFILE;`
384			`u->last_record = 0;`
385			`u->current_record = 0;`
386			`u->mode = READING;`
387			`u->maxrec = 0;`
388			`u->bytes_left = 0;`
389
390			`if (flags->position == POSITION_APPEND)`
391			`{`
392			`if (sseek (u->s, file_length (u->s)) == FAILURE)`
393			`generate_error (&opp->common, ERROR_OS, NULL);`
394			`u->endfile = AT_ENDFILE;`
395			`}`
396
397			`/* Unspecified recl ends up with a processor dependent value. */`
398
399			`if ((opp->common.flags & IOPARM_OPEN_HAS_RECL_IN))`
400			`u->recl = opp->recl_in;`
401			`else`
402			`{`
403			`switch (compile_options.record_marker)`
404			`{`
405			`case 0:`
406			`u->recl = max_offset;`
407			`break;`
408
409			`case sizeof (GFC_INTEGER_4):`
410			`u->recl = GFC_INTEGER_4_HUGE;`
411			`break;`
412
413			`case sizeof (GFC_INTEGER_8):`
414			`u->recl = max_offset;`
415			`break;`
416
417			`default:`
418			`runtime_error ("Illegal value for record marker");`
419			`break;`
420			`}`
421			`}`
422
423			`/* If the file is direct access, calculate the maximum record number`
424			`via a division now instead of letting the multiplication overflow`
425			`later. */`
426
427			`if (flags->access == ACCESS_DIRECT)`
428			`u->maxrec = max_offset / u->recl;`
429
430			`memmove (u->file, opp->file, opp->file_len);`
431			`u->file_len = opp->file_len;`
432
433			`/* Curiously, the standard requires that the`
434			`position specifier be ignored for new files so a newly connected`
435			`file starts out that the initial point. We still need to figure`
436			`out if the file is at the end or not. */`
437
438			`test_endfile (u);`
439
440			`if (flags->status == STATUS_SCRATCH && opp->file != NULL)`
441			`free_mem (opp->file);`
442			`return u;`
443
444			`cleanup:`
445
446			`/* Free memory associated with a temporary filename. */`
447
448			`if (flags->status == STATUS_SCRATCH && opp->file != NULL)`
449			`free_mem (opp->file);`
450
451			`fail:`
452
453			`close_unit (u);`
454			`return NULL;`
455			`}`
456
457
458			`/* Open a unit which is already open. This involves changing the`
459			`modes or closing what is there now and opening the new file. */`
460
461			`static void`
462			`already_open (st_parameter_open opp, gfc_unit u, unit_flags * flags)`
463			`{`
464			`if ((opp->common.flags & IOPARM_OPEN_HAS_FILE) == 0)`
465			`{`
466			`edit_modes (opp, u, flags);`
467			`return;`
468			`}`
469
470			`/* If the file is connected to something else, close it and open a`
471			`new unit. */`
472
473			`if (!compare_file_filename (u, opp->file, opp->file_len))`
474			`{`
475			`#if !HAVE_UNLINK_OPEN_FILE`
476			`char *path = NULL;`
477			`if (u->file && u->flags.status == STATUS_SCRATCH)`
478			`{`
479			`path = (char *) gfc_alloca (u->file_len + 1);`
480			`unpack_filename (path, u->file, u->file_len);`
481			`}`
482			`#endif`
483
484			`if (sclose (u->s) == FAILURE)`
485			`{`
486			`unlock_unit (u);`
487			`generate_error (&opp->common, ERROR_OS,`
488			`"Error closing file in OPEN statement");`
489			`return;`
490			`}`
491
492			`u->s = NULL;`
493			`if (u->file)`
494			`free_mem (u->file);`
495			`u->file = NULL;`
496			`u->file_len = 0;`
497
498			`#if !HAVE_UNLINK_OPEN_FILE`
499			`if (path != NULL)`
500			`unlink (path);`
501			`#endif`
502
503			`u = new_unit (opp, u, flags);`
504			`if (u != NULL)`
505			`unlock_unit (u);`
506			`return;`
507			`}`
508
509			`edit_modes (opp, u, flags);`
510			`}`
511
512
513			`/* Open file. */`
514
515			`extern void st_open (st_parameter_open *opp);`
516			`export_proto(st_open);`
517
518			`void`
519			`st_open (st_parameter_open *opp)`
520			`{`
521			`unit_flags flags;`
522			`gfc_unit *u = NULL;`
523			`GFC_INTEGER_4 cf = opp->common.flags;`
524			`unit_convert conv;`
525
526			`library_start (&opp->common);`
527
528			`/* Decode options. */`
529
530			`flags.access = !(cf & IOPARM_OPEN_HAS_ACCESS) ? ACCESS_UNSPECIFIED :`
531			`find_option (&opp->common, opp->access, opp->access_len,`
532			`access_opt, "Bad ACCESS parameter in OPEN statement");`
533
534			`flags.action = !(cf & IOPARM_OPEN_HAS_ACTION) ? ACTION_UNSPECIFIED :`
535			`find_option (&opp->common, opp->action, opp->action_len,`
536			`action_opt, "Bad ACTION parameter in OPEN statement");`
537
538			`flags.blank = !(cf & IOPARM_OPEN_HAS_BLANK) ? BLANK_UNSPECIFIED :`
539			`find_option (&opp->common, opp->blank, opp->blank_len,`
540			`blank_opt, "Bad BLANK parameter in OPEN statement");`
541
542			`flags.delim = !(cf & IOPARM_OPEN_HAS_DELIM) ? DELIM_UNSPECIFIED :`
543			`find_option (&opp->common, opp->delim, opp->delim_len,`
544			`delim_opt, "Bad DELIM parameter in OPEN statement");`
545
546			`flags.pad = !(cf & IOPARM_OPEN_HAS_PAD) ? PAD_UNSPECIFIED :`
547			`find_option (&opp->common, opp->pad, opp->pad_len,`
548			`pad_opt, "Bad PAD parameter in OPEN statement");`
549
550			`flags.form = !(cf & IOPARM_OPEN_HAS_FORM) ? FORM_UNSPECIFIED :`
551			`find_option (&opp->common, opp->form, opp->form_len,`
552			`form_opt, "Bad FORM parameter in OPEN statement");`
553
554			`flags.position = !(cf & IOPARM_OPEN_HAS_POSITION) ? POSITION_UNSPECIFIED :`
555			`find_option (&opp->common, opp->position, opp->position_len,`
556			`position_opt, "Bad POSITION parameter in OPEN statement");`
557
558			`flags.status = !(cf & IOPARM_OPEN_HAS_STATUS) ? STATUS_UNSPECIFIED :`
559			`find_option (&opp->common, opp->status, opp->status_len,`
560			`status_opt, "Bad STATUS parameter in OPEN statement");`
561
562			`/* First, we check wether the convert flag has been set via environment`
563			`variable. This overrides the convert tag in the open statement. */`
564
565			`conv = get_unformatted_convert (opp->common.unit);`
566
567			`if (conv == CONVERT_NONE)`
568			`{`
569			`/* Nothing has been set by environment variable, check the convert tag. */`
570			`if (cf & IOPARM_OPEN_HAS_CONVERT)`
571			`conv = find_option (&opp->common, opp->convert, opp->convert_len,`
572			`convert_opt,`
573			`"Bad CONVERT parameter in OPEN statement");`
574			`else`
575			`conv = compile_options.convert;`
576			`}`
577
578			`/* We use l8_to_l4_offset, which is 0 on little-endian machines`
579			`and 1 on big-endian machines. */`
580			`switch (conv)`
581			`{`
582			`case CONVERT_NATIVE:`
583			`case CONVERT_SWAP:`
584			`break;`
585
586			`case CONVERT_BIG:`
587			`conv = l8_to_l4_offset ? CONVERT_NATIVE : CONVERT_SWAP;`
588			`break;`
589
590			`case CONVERT_LITTLE:`
591			`conv = l8_to_l4_offset ? CONVERT_SWAP : CONVERT_NATIVE;`
592			`break;`
593
594			`default:`
595			`internal_error (&opp->common, "Illegal value for CONVERT");`
596			`break;`
597			`}`
598
599			`flags.convert = conv;`
600
601			`if (opp->common.unit < 0)`
602			`generate_error (&opp->common, ERROR_BAD_OPTION,`
603			`"Bad unit number in OPEN statement");`
604
605			`if (flags.position != POSITION_UNSPECIFIED`
606			`&& flags.access == ACCESS_DIRECT)`
607			`generate_error (&opp->common, ERROR_BAD_OPTION,`
608			`"Cannot use POSITION with direct access files");`
609
610			`if (flags.access == ACCESS_APPEND)`
611			`{`
612			`if (flags.position != POSITION_UNSPECIFIED`
613			`&& flags.position != POSITION_APPEND)`
614			`generate_error (&opp->common, ERROR_BAD_OPTION,`
615			`"Conflicting ACCESS and POSITION flags in"`
616			`" OPEN statement");`
617
618			`notify_std (GFC_STD_GNU,`
619			`"Extension: APPEND as a value for ACCESS in OPEN statement");`
620			`flags.access = ACCESS_SEQUENTIAL;`
621			`flags.position = POSITION_APPEND;`
622			`}`
623
624			`if (flags.position == POSITION_UNSPECIFIED)`
625			`flags.position = POSITION_ASIS;`
626
627			`if ((opp->common.flags & IOPARM_LIBRETURN_MASK) == IOPARM_LIBRETURN_OK)`
628			`{`
629			`u = find_or_create_unit (opp->common.unit);`
630
631			`if (u->s == NULL)`
632			`{`
633			`u = new_unit (opp, u, &flags);`
634			`if (u != NULL)`
635			`unlock_unit (u);`
636			`}`
637			`else`
638			`already_open (opp, u, &flags);`
639			`}`
640
641			`library_end ();`
642			`}`