/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
   Contributed by Andy Vaught

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/>.  */


/* Implement the non-IOLENGTH variant of the INQUIRY statement */

#include "io.h"
#include "unix.h"
#include <string.h>


static const char yes[] = "YES", no[] = "NO", undefined[] = "UNDEFINED";


/* inquire_via_unit()-- Inquiry via unit number.  The unit might not exist. */

static void
inquire_via_unit (st_parameter_inquire *iqp, gfc_unit * u)
{
  const char *p;
  GFC_INTEGER_4 cf = iqp->common.flags;

  if (iqp->common.unit == GFC_INTERNAL_UNIT)
    generate_error (&iqp->common, LIBERROR_INQUIRE_INTERNAL_UNIT, NULL);

  if ((cf & IOPARM_INQUIRE_HAS_EXIST) != 0)
    *iqp->exist = (u != NULL) || (iqp->common.unit >= 0);

  if ((cf & IOPARM_INQUIRE_HAS_OPENED) != 0)
    *iqp->opened = (u != NULL);

  if ((cf & IOPARM_INQUIRE_HAS_NUMBER) != 0)
    *iqp->number = (u != NULL) ? u->unit_number : -1;

  if ((cf & IOPARM_INQUIRE_HAS_NAMED) != 0)
    *iqp->named = (u != NULL && u->flags.status != STATUS_SCRATCH);

  if ((cf & IOPARM_INQUIRE_HAS_NAME) != 0
      && u != NULL && u->flags.status != STATUS_SCRATCH)
    {
#if defined(HAVE_TTYNAME_R) || defined(HAVE_TTYNAME)
      if (u->unit_number == options.stdin_unit
	  || u->unit_number == options.stdout_unit
	  || u->unit_number == options.stderr_unit)
	{
	  int err = stream_ttyname (u->s, iqp->name, iqp->name_len);
	  if (err == 0)
	    {
	      gfc_charlen_type tmplen = strlen (iqp->name);
	      if (iqp->name_len > tmplen)
		memset (&iqp->name[tmplen], ' ', iqp->name_len - tmplen);
	    }
	  else /* If ttyname does not work, go with the default.  */
	    cf_strcpy (iqp->name, iqp->name_len, u->filename);
	}
      else
	cf_strcpy (iqp->name, iqp->name_len, u->filename);
#elif defined __MINGW32__
      if (u->unit_number == options.stdin_unit)
	fstrcpy (iqp->name, iqp->name_len, "CONIN$", sizeof("CONIN$"));
      else if (u->unit_number == options.stdout_unit)
	fstrcpy (iqp->name, iqp->name_len, "CONOUT$", sizeof("CONOUT$"));
      else if (u->unit_number == options.stderr_unit)
	fstrcpy (iqp->name, iqp->name_len, "CONERR$", sizeof("CONERR$"));
      else
	cf_strcpy (iqp->name, iqp->name_len, u->filename);
#else
      cf_strcpy (iqp->name, iqp->name_len, u->filename);
#endif
    }

  if ((cf & IOPARM_INQUIRE_HAS_ACCESS) != 0)
    {
      if (u == NULL)
	p = undefined;
      else
	switch (u->flags.access)
	  {
	  case ACCESS_SEQUENTIAL:
	    p = "SEQUENTIAL";
	    break;
	  case ACCESS_DIRECT:
	    p = "DIRECT";
	    break;
	  case ACCESS_STREAM:
	    p = "STREAM";
	    break;
	  default:
	    internal_error (&iqp->common, "inquire_via_unit(): Bad access");
	  }

      cf_strcpy (iqp->access, iqp->access_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_SEQUENTIAL) != 0)
    {
      if (u == NULL)
	p = inquire_sequential (NULL, 0);
      else
	switch (u->flags.access)
	  {
	  case ACCESS_DIRECT:
	  case ACCESS_STREAM:
	    p = no;
	    break;
	  case ACCESS_SEQUENTIAL:
	    p = yes;
	    break;
	  default:
	    internal_error (&iqp->common, "inquire_via_unit(): Bad access");
	  }

      cf_strcpy (iqp->sequential, iqp->sequential_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_DIRECT) != 0)
    {
      if (u == NULL)
	p = inquire_direct (NULL, 0);
      else
	switch (u->flags.access)
	  {
	  case ACCESS_SEQUENTIAL:
	  case ACCESS_STREAM:
	    p = no;
	    break;
	  case ACCESS_DIRECT:
	    p = yes;
	    break;
	  default:
	    internal_error (&iqp->common, "inquire_via_unit(): Bad access");
	  }

      cf_strcpy (iqp->direct, iqp->direct_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_FORM) != 0)
    {
      if (u == NULL)
	p = undefined;
      else
	switch (u->flags.form)
	  {
	  case FORM_FORMATTED:
	    p = "FORMATTED";
	    break;
	  case FORM_UNFORMATTED:
	    p = "UNFORMATTED";
	    break;
	  default:
	    internal_error (&iqp->common, "inquire_via_unit(): Bad form");
	  }

      cf_strcpy (iqp->form, iqp->form_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_FORMATTED) != 0)
    {
      if (u == NULL)
	p = inquire_formatted (NULL, 0);
      else
	switch (u->flags.form)
	  {
	  case FORM_FORMATTED:
	    p = yes;
	    break;
	  case FORM_UNFORMATTED:
	    p = no;
	    break;
	  default:
	    internal_error (&iqp->common, "inquire_via_unit(): Bad form");
	  }

      cf_strcpy (iqp->formatted, iqp->formatted_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_UNFORMATTED) != 0)
    {
      if (u == NULL)
	p = inquire_unformatted (NULL, 0);
      else
	switch (u->flags.form)
	  {
	  case FORM_FORMATTED:
	    p = no;
	    break;
	  case FORM_UNFORMATTED:
	    p = yes;
	    break;
	  default:
	    internal_error (&iqp->common, "inquire_via_unit(): Bad form");
	  }

      cf_strcpy (iqp->unformatted, iqp->unformatted_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_RECL_OUT) != 0)
    *iqp->recl_out = (u != NULL) ? u->recl : 0;

  if ((cf & IOPARM_INQUIRE_HAS_STRM_POS_OUT) != 0)
    *iqp->strm_pos_out = (u != NULL) ? u->strm_pos : 0;

  if ((cf & IOPARM_INQUIRE_HAS_NEXTREC) != 0)
    {
      /* This only makes sense in the context of DIRECT access.  */
      if (u != NULL && u->flags.access == ACCESS_DIRECT)
	*iqp->nextrec = u->last_record + 1;
      else
	*iqp->nextrec = 0;
    }

  if ((cf & IOPARM_INQUIRE_HAS_BLANK) != 0)
    {
      if (u == NULL || u->flags.form != FORM_FORMATTED)
	p = undefined;
      else
	switch (u->flags.blank)
	  {
	  case BLANK_NULL:
	    p = "NULL";
	    break;
	  case BLANK_ZERO:
	    p = "ZERO";
	    break;
	  default:
	    internal_error (&iqp->common, "inquire_via_unit(): Bad blank");
	  }

      cf_strcpy (iqp->blank, iqp->blank_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_PAD) != 0)
    {
      if (u == NULL || u->flags.form != FORM_FORMATTED)
	p = undefined;
      else
	switch (u->flags.pad)
	  {
	  case PAD_YES:
	    p = yes;
	    break;
	  case PAD_NO:
	    p = no;
	    break;
	  default:
	    internal_error (&iqp->common, "inquire_via_unit(): Bad pad");
	  }

      cf_strcpy (iqp->pad, iqp->pad_len, p);
    }

  if (cf & IOPARM_INQUIRE_HAS_FLAGS2)
    {
      GFC_INTEGER_4 cf2 = iqp->flags2;

      if ((cf2 & IOPARM_INQUIRE_HAS_PENDING) != 0)
	*iqp->pending = 0;
  
      if ((cf2 & IOPARM_INQUIRE_HAS_ID) != 0)
        *iqp->id = 0;

      if ((cf2 & IOPARM_INQUIRE_HAS_ENCODING) != 0)
	{
	  if (u == NULL || u->flags.form != FORM_FORMATTED)
	    p = undefined;
          else
	    switch (u->flags.encoding)
	      {
	      case ENCODING_DEFAULT:
		p = "UNKNOWN";
		break;
	      case ENCODING_UTF8:
		p = "UTF-8";
		break;
	      default:
		internal_error (&iqp->common, "inquire_via_unit(): Bad encoding");
	      }

	  cf_strcpy (iqp->encoding, iqp->encoding_len, p);
	}

      if ((cf2 & IOPARM_INQUIRE_HAS_DECIMAL) != 0)
	{
	  if (u == NULL || u->flags.form != FORM_FORMATTED)
	    p = undefined;
	  else
	    switch (u->flags.decimal)
	      {
	      case DECIMAL_POINT:
		p = "POINT";
		break;
	      case DECIMAL_COMMA:
		p = "COMMA";
		break;
	      default:
		internal_error (&iqp->common, "inquire_via_unit(): Bad comma");
	      }

	  cf_strcpy (iqp->decimal, iqp->decimal_len, p);
	}

      if ((cf2 & IOPARM_INQUIRE_HAS_ASYNCHRONOUS) != 0)
	{
	  if (u == NULL)
	    p = undefined;
	  else
	    switch (u->flags.async)
	    {
	      case ASYNC_YES:
		p = yes;
		break;
	      case ASYNC_NO:
		p = no;
		break;
	      default:
		internal_error (&iqp->common, "inquire_via_unit(): Bad async");
	    }

	  cf_strcpy (iqp->asynchronous, iqp->asynchronous_len, p);
	}

      if ((cf2 & IOPARM_INQUIRE_HAS_SIGN) != 0)
	{
	  if (u == NULL)
	    p = undefined;
	  else
	    switch (u->flags.sign)
	    {
	      case SIGN_PROCDEFINED:
		p = "PROCESSOR_DEFINED";
		break;
	      case SIGN_SUPPRESS:
		p = "SUPPRESS";
		break;
	      case SIGN_PLUS:
		p = "PLUS";
		break;
	      default:
		internal_error (&iqp->common, "inquire_via_unit(): Bad sign");
	    }

	  cf_strcpy (iqp->sign, iqp->sign_len, p);
	}

      if ((cf2 & IOPARM_INQUIRE_HAS_ROUND) != 0)
	{
	  if (u == NULL)
	    p = undefined;
	  else
	    switch (u->flags.round)
	    {
	      case ROUND_UP:
		p = "UP";
		break;
	      case ROUND_DOWN:
		p = "DOWN";
		break;
	      case ROUND_ZERO:
		p = "ZERO";
		break;
	      case ROUND_NEAREST:
		p = "NEAREST";
		break;
	      case ROUND_COMPATIBLE:
		p = "COMPATIBLE";
		break;
	      case ROUND_PROCDEFINED:
		p = "PROCESSOR_DEFINED";
		break;
	      default:
		internal_error (&iqp->common, "inquire_via_unit(): Bad round");
	    }

	  cf_strcpy (iqp->round, iqp->round_len, p);
	}

      if ((cf2 & IOPARM_INQUIRE_HAS_SIZE) != 0)
	{
	  if (u == NULL)
	    *iqp->size = -1;
	  else
	    {
	      sflush (u->s);
	      *iqp->size = ssize (u->s);
	    }
	}

      if ((cf2 & IOPARM_INQUIRE_HAS_IQSTREAM) != 0)
	{
	  if (u == NULL)
	    p = "UNKNOWN";
	  else
	    switch (u->flags.access)
	      {
	      case ACCESS_SEQUENTIAL:
	      case ACCESS_DIRECT:
		p = no;
		break;
	      case ACCESS_STREAM:
		p = yes;
		break;
	      default:
		internal_error (&iqp->common, "inquire_via_unit(): Bad pad");
	      }
    
	  cf_strcpy (iqp->iqstream, iqp->iqstream_len, p);
	}
    }

  if ((cf & IOPARM_INQUIRE_HAS_POSITION) != 0)
    {
      if (u == NULL || u->flags.access == ACCESS_DIRECT)
        p = undefined;
      else
	{
	  /* If the position is unspecified, check if we can figure
	     out whether it's at the beginning or end.  */
	  if (u->flags.position == POSITION_UNSPECIFIED)
	    {
	      gfc_offset cur = stell (u->s);
	      if (cur == 0)
		u->flags.position = POSITION_REWIND;
	      else if (cur != -1 && (ssize (u->s) == cur))
		u->flags.position = POSITION_APPEND;
	    }
	  switch (u->flags.position)
	    {
	    case POSITION_REWIND:
	      p = "REWIND";
	      break;
	    case POSITION_APPEND:
	      p = "APPEND";
	      break;
	    case POSITION_ASIS:
	      p = "ASIS";
	      break;
	    default:
	      /* If the position has changed and is not rewind or
		 append, it must be set to a processor-dependent
		 value.  */
	      p = "UNSPECIFIED";
	      break;
	    }
	}
      cf_strcpy (iqp->position, iqp->position_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_ACTION) != 0)
    {
      if (u == NULL)
	p = undefined;
      else
	switch (u->flags.action)
	  {
	  case ACTION_READ:
	    p = "READ";
	    break;
	  case ACTION_WRITE:
	    p = "WRITE";
	    break;
	  case ACTION_READWRITE:
	    p = "READWRITE";
	    break;
	  default:
	    internal_error (&iqp->common, "inquire_via_unit(): Bad action");
	  }

      cf_strcpy (iqp->action, iqp->action_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_READ) != 0)
    {
      p = (!u || u->flags.action == ACTION_WRITE) ? no : yes;
      cf_strcpy (iqp->read, iqp->read_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_WRITE) != 0)
    {
      p = (!u || u->flags.action == ACTION_READ) ? no : yes;
      cf_strcpy (iqp->write, iqp->write_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_READWRITE) != 0)
    {
      p = (!u || u->flags.action != ACTION_READWRITE) ? no : yes;
      cf_strcpy (iqp->readwrite, iqp->readwrite_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_DELIM) != 0)
    {
      if (u == NULL || u->flags.form != FORM_FORMATTED)
	p = undefined;
      else
	switch (u->flags.delim)
	  {
	  case DELIM_NONE:
	  case DELIM_UNSPECIFIED:
	    p = "NONE";
	    break;
	  case DELIM_QUOTE:
	    p = "QUOTE";
	    break;
	  case DELIM_APOSTROPHE:
	    p = "APOSTROPHE";
	    break;
	  default:
	    internal_error (&iqp->common, "inquire_via_unit(): Bad delim");
	  }

      cf_strcpy (iqp->delim, iqp->delim_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_PAD) != 0)
    {
      if (u == NULL || u->flags.form != FORM_FORMATTED)
	p = undefined;
      else
	switch (u->flags.pad)
	  {
	  case PAD_NO:
	    p = no;
	    break;
	  case PAD_YES:
	    p = yes;
	    break;
	  default:
	    internal_error (&iqp->common, "inquire_via_unit(): Bad pad");
	  }

      cf_strcpy (iqp->pad, iqp->pad_len, p);
    }
 
  if ((cf & IOPARM_INQUIRE_HAS_CONVERT) != 0)
    {
      if (u == NULL)
	p = undefined;
      else
	switch (u->flags.convert)
	  {
	    /*  big_endian is 0 for little-endian, 1 for big-endian.  */
	  case GFC_CONVERT_NATIVE:
	    p = big_endian ? "BIG_ENDIAN" : "LITTLE_ENDIAN";
	    break;

	  case GFC_CONVERT_SWAP:
	    p = big_endian ? "LITTLE_ENDIAN" : "BIG_ENDIAN";
	    break;

	  default:
	    internal_error (&iqp->common, "inquire_via_unit(): Bad convert");
	  }

      cf_strcpy (iqp->convert, iqp->convert_len, p);
    }
}


/* inquire_via_filename()-- Inquiry via filename.  This subroutine is
 * only used if the filename is *not* connected to a unit number. */

static void
inquire_via_filename (st_parameter_inquire *iqp)
{
  const char *p;
  GFC_INTEGER_4 cf = iqp->common.flags;

  if ((cf & IOPARM_INQUIRE_HAS_EXIST) != 0)
    *iqp->exist = file_exists (iqp->file, iqp->file_len);

  if ((cf & IOPARM_INQUIRE_HAS_OPENED) != 0)
    *iqp->opened = 0;

  if ((cf & IOPARM_INQUIRE_HAS_NUMBER) != 0)
    *iqp->number = -1;

  if ((cf & IOPARM_INQUIRE_HAS_NAMED) != 0)
    *iqp->named = 1;

  if ((cf & IOPARM_INQUIRE_HAS_NAME) != 0)
    fstrcpy (iqp->name, iqp->name_len, iqp->file, iqp->file_len);

  if ((cf & IOPARM_INQUIRE_HAS_ACCESS) != 0)
    cf_strcpy (iqp->access, iqp->access_len, undefined);

  if ((cf & IOPARM_INQUIRE_HAS_SEQUENTIAL) != 0)
    {
      p = "UNKNOWN";
      cf_strcpy (iqp->sequential, iqp->sequential_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_DIRECT) != 0)
    {
      p = "UNKNOWN";
      cf_strcpy (iqp->direct, iqp->direct_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_FORM) != 0)
    cf_strcpy (iqp->form, iqp->form_len, undefined);

  if ((cf & IOPARM_INQUIRE_HAS_FORMATTED) != 0)
    {
      p = "UNKNOWN";
      cf_strcpy (iqp->formatted, iqp->formatted_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_UNFORMATTED) != 0)
    {
      p = "UNKNOWN";
      cf_strcpy (iqp->unformatted, iqp->unformatted_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_RECL_OUT) != 0)
    *iqp->recl_out = 0;

  if ((cf & IOPARM_INQUIRE_HAS_NEXTREC) != 0)
    *iqp->nextrec = 0;

  if ((cf & IOPARM_INQUIRE_HAS_BLANK) != 0)
    cf_strcpy (iqp->blank, iqp->blank_len, undefined);

  if ((cf & IOPARM_INQUIRE_HAS_PAD) != 0)
    cf_strcpy (iqp->pad, iqp->pad_len, undefined);

  if (cf & IOPARM_INQUIRE_HAS_FLAGS2)
    {
      GFC_INTEGER_4 cf2 = iqp->flags2;

      if ((cf2 & IOPARM_INQUIRE_HAS_ENCODING) != 0)
	cf_strcpy (iqp->encoding, iqp->encoding_len, undefined);
  
      if ((cf2 & IOPARM_INQUIRE_HAS_DELIM) != 0)
	cf_strcpy (iqp->delim, iqp->delim_len, undefined);

      if ((cf2 & IOPARM_INQUIRE_HAS_DECIMAL) != 0)
	cf_strcpy (iqp->decimal, iqp->decimal_len, undefined);

      if ((cf2 & IOPARM_INQUIRE_HAS_DELIM) != 0)
	cf_strcpy (iqp->delim, iqp->delim_len, undefined);

      if ((cf2 & IOPARM_INQUIRE_HAS_PAD) != 0)
	cf_strcpy (iqp->pad, iqp->pad_len, undefined);
  
      if ((cf2 & IOPARM_INQUIRE_HAS_ENCODING) != 0)
	cf_strcpy (iqp->encoding, iqp->encoding_len, undefined);

      if ((cf2 & IOPARM_INQUIRE_HAS_SIZE) != 0)
	*iqp->size = file_size (iqp->file, iqp->file_len);

      if ((cf2 & IOPARM_INQUIRE_HAS_IQSTREAM) != 0)
	cf_strcpy (iqp->iqstream, iqp->iqstream_len, "UNKNOWN");
    }

  if ((cf & IOPARM_INQUIRE_HAS_POSITION) != 0)
    cf_strcpy (iqp->position, iqp->position_len, undefined);

  if ((cf & IOPARM_INQUIRE_HAS_ACCESS) != 0)
    cf_strcpy (iqp->access, iqp->access_len, undefined);

  if ((cf & IOPARM_INQUIRE_HAS_READ) != 0)
    {
      p = inquire_read (iqp->file, iqp->file_len);
      cf_strcpy (iqp->read, iqp->read_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_WRITE) != 0)
    {
      p = inquire_write (iqp->file, iqp->file_len);
      cf_strcpy (iqp->write, iqp->write_len, p);
    }

  if ((cf & IOPARM_INQUIRE_HAS_READWRITE) != 0)
    {
      p = inquire_read (iqp->file, iqp->file_len);
      cf_strcpy (iqp->readwrite, iqp->readwrite_len, p);
    }
}


/* Library entry point for the INQUIRE statement (non-IOLENGTH
   form).  */

extern void st_inquire (st_parameter_inquire *);
export_proto(st_inquire);

void
st_inquire (st_parameter_inquire *iqp)
{
  gfc_unit *u;

  library_start (&iqp->common);

  if ((iqp->common.flags & IOPARM_INQUIRE_HAS_FILE) == 0)
    {
      u = find_unit (iqp->common.unit);
      inquire_via_unit (iqp, u);
    }
  else
    {
      u = find_file (iqp->file, iqp->file_len);
      if (u == NULL)
	inquire_via_filename (iqp);
      else
	inquire_via_unit (iqp, u);
    }
  if (u != NULL)
    unlock_unit (u);

  library_end ();
}