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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
SPDX-License-Identifier:	BSD-3-Clause



%%	header

/**	@file
	Check whether a file pointer
	is connected to a terminal.

	CRT on Windows: Required.
*/

#ifndef DK4CONF_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4conf.h"
#else
#include <dktools-4/dk4conf.h>
#endif
#endif

#ifndef DK4TYPES_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4types.h"
#else
#include <dktools-4/dk4types.h>
#endif
#endif

#ifndef DK4ERROR_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4error.h"
#else
#include <dktools-4/dk4error.h>
#endif
#endif

#ifndef STDIO_H_INCLUDED
#include <stdio.h>
#define	STDIO_H_INCLUDED	1
#endif


#ifdef __cplusplus
extern "C" {
#endif

/**	Check  whether the file descriptor is connected to a
	tty (terminal, printer, serial line).
	@param	fd	File descriptor to check.
	@param	erp	Error report, may be NULL.
	@return	1 for tty, 0 for other file descriptor, -1 on error.
	
	Error codes:
	- DK4_E_NOT_SUPPORTED<br>
	  if not isatty() or _isatty() function available on the system.
*/
int
dk4istty(int fd, dk4_er_t *erp);

/**	Check whether a FILE pointer is connected to a tty
	(terminal, printer, serial line).
	@param	fipo	FILE to check.
	@param	erp	Error report, may be NULL.
	@return 1 for tty, 0 for other file descriptor, -1 on error.
*/
int
dk4istty_file(FILE *fipo, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk4conf.h"
#include "dk4istty.h"

#if DK4_HAVE_UNISTD_H
#ifndef UNISTD_H_INCLUDED
#include <unistd.h>
#define	UNISTD_H_INCLUDED	1
#endif
#endif

#if DK4_HAVE_IO_H
#ifndef IO_H_INCLUDED
#include <io.h>
#define	IO_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_ASSERT_H
#ifndef	ASSERT_H_INCLUDED
#include <assert.h>
#define	ASSERT_H_INCLUDED 1
#endif
#endif

#include "dk4unused.h"



$!trace-include



int
dk4istty(
#if (DK4_HAVE_ISATTY) || (DK4_HAVE__ISATTY)
  int fd, dk4_er_t * DK4_ARG_UNUSED(erp)
#else
  int fd, dk4_er_t *erp
#endif
)
{
  int		 back	=	-1;
#if DK4_HAVE_ISATTY
  DK4_UNUSED_ARG(erp)
  if ( 0 != isatty(fd) ) {
    back = 1;
  } else {
    back = 0;
  }
#else
#if DK4_HAVE__ISATTY
  DK4_UNUSED_ARG(erp)
  if ( 0 != _isatty(fd) ) {
    back = 1;
  } else {
    back = 0;
  }
#else
  dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
#endif
#endif
  return back;
}



int
dk4istty_file(FILE *fipo, dk4_er_t *erp)
{
  int		 back	=	-1;
#if	DK4_USE_ASSERT
  assert(NULL != fipo);
#endif
  if (NULL != fipo) {
#if DK4_HAVE_FILENO
    back = dk4istty(fileno(fipo), erp);
#else
#if DK4_HAVE__FILENO
    back = dk4istty(_fileno(fipo), erp);
#else
    dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
#endif
#endif
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}