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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd



%%	header

/**	@file
	File checks.
*/

#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif

#ifndef DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif

#ifdef __cplusplus
extern "C" {
#endif

/**	Check whether a path exists.
	CRT on Windows: Not used.
	@param	fn	File name.
	@param	erp	Error report, may be NULL.
	@return	1 if file exists, 0 otherwise.
	Note: The function also returns 0 if it fails to obtain information
	about a file, i.e. due to missing permissions...
	
	Error codes:
	- DK4_E_NOT_SUPPORTED<br>
	  on non-Windows systems,
	- DK4_E_INVALID_ARGUMENTS<br>
	  if fn is NULL,
	- DK4_E_NOT_FOUND<br>
	  if the specified file was not found or retrieving information
	  failed for other reasons.
*/
int
dk4file_wc_exists(const wchar_t *fn, dk4_er_t *erp);

/**	Check whether a path name specifies a regular file.
	CRT on Windows: Not used.
	@param	fn	File name.
	@param	erp	Error report, may be NULL.
	@return	1 for existing regular file, 0 otherwise.
	
	Error codes:
	- DK4_E_NOT_SUPPORTED<br>
	  on non-Windows systems,
	- DK4_E_INVALID_ARGUMENTS<br>
	  if fn is NULL,
	- DK4_E_NOT_FOUND<br>
	  if the file does not exist or retrieving the information failed
	  for some reason,
	- none<br>
	  if the path exists but is not a regular file.
*/
int
dk4file_wc_is_regular(const wchar_t *fn, dk4_er_t *erp);

/**	Check whether a path name specifies a directory.
	CRT on Windows: Not used.
	@param	fn	File name.
	@param	erp	Error report, may be NULL.
	@return	1 for existing directory, 0 otherwise.
	
	Error codes:
	- DK4_E_NOT_SUPPORTED<br>
	  on non-Windows systems,
	- DK4_E_INVALID_ARGUMENTS<br>
	  if fn is NULL,
	- DK4_E_NOT_FOUND<br>
	  if the file does not exist or retrieving the information failed for
	  some reason,
	- none			if the path exists but is not a directory.
*/
int
dk4file_wc_is_directory(const wchar_t *fn, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk4conf.h"
#include "dk4types.h"

#if DK4_ON_WINDOWS
#ifndef WINDOWS_H_INCLUDED
#include <windows.h>
#define	WINDOWS_H_INCLUDED 1
#endif
#else
#ifndef DK4STATW_H_INCLUDED
#include "dk4statw.h"
#endif
#endif

#include "dk4filew.h"


int
dk4file_wc_exists(const wchar_t *fn, dk4_er_t *erp)
{
#if DK4_ON_WINDOWS
  DWORD		 	dwattr;
  HANDLE		ha;
  WIN32_FIND_DATAW	ffdata;
#endif
  int		 back = 0;
#if DK4_ON_WINDOWS
  if (NULL != fn) {
    dwattr = GetFileAttributesW(fn);
    if (INVALID_FILE_ATTRIBUTES != dwattr) {
      back = 1;
    } else {
      ha = FindFirstFileW(fn, &ffdata);
      if (INVALID_HANDLE_VALUE != ha) {
        back = 1;
        FindClose(ha);
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_NOT_FOUND);
      }
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
#else
  dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
#endif
  return back;
}



int
dk4file_wc_is_regular(const wchar_t *fn, dk4_er_t *erp)
{
#if DK4_ON_WINDOWS
  DWORD 		dwattr;
  HANDLE		ha;
  WIN32_FIND_DATAW	ffdata;
  int	back	= 0;
  if (NULL != fn) {
    dwattr = GetFileAttributesW(fn);
    if (INVALID_FILE_ATTRIBUTES != dwattr) {
      if ((DWORD)0UL == (FILE_ATTRIBUTE_DIRECTORY & dwattr)) {
        if ((DWORD)0UL == (FILE_ATTRIBUTE_DEVICE & dwattr)) {
	  back = 1;
	}
      }
    } else {
      ha = FindFirstFileW(fn, &ffdata);
      if (INVALID_HANDLE_VALUE != ha) {
        dwattr = ffdata.dwFileAttributes;
	if ((DWORD)0UL == (FILE_ATTRIBUTE_DIRECTORY & dwattr)) {
	  if ((DWORD)0UL == (FILE_ATTRIBUTE_DEVICE & dwattr)) {
	    back = 1;
	  }
	}
        FindClose(ha);
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_NOT_FOUND);
      }
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
#else
  dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
  return 0;
#endif
}



int
dk4file_wc_is_directory(const wchar_t *fn, dk4_er_t *erp)
{
#if DK4_ON_WINDOWS
  WIN32_FIND_DATAW	ffdata;
  DWORD		 	dwattr;
  HANDLE		ha;
  int		 	back = 0;
  if (NULL != fn) {
    dwattr = GetFileAttributesW(fn);
    if (INVALID_FILE_ATTRIBUTES != dwattr) {
      if ((DWORD)0UL != (FILE_ATTRIBUTE_DIRECTORY & dwattr)) {
        back = 1;
      }
    } else {
      ha = FindFirstFileW(fn, &ffdata);
      if (INVALID_HANDLE_VALUE != ha) {
        dwattr = ffdata.dwFileAttributes;
	if ((DWORD)0UL != (FILE_ATTRIBUTE_DIRECTORY & dwattr)) {
	  back = 1;
	}
	FindClose(ha);
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_NOT_FOUND);
      }
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
#else
  dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
  return 0;
#endif
}