%%	options

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



%%	header

/**	@file
	Retrieve host name in wchar_t characters.

	CRT on Windows: Not used.
*/

#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

/**	Retrieve host name (short host name without any domain).
	@param	buffer	Result buffer.
	@param	sz	Result buffer size (number of wchar_t).
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.
	
	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if buffer is NULL or sz is 0 or sz is too large,
	- DK4_E_NOT_FOUND<br>
	  if the system function to retrieve the host name failed,
	- DK4_E_BUFFER_TOO_SMALL<br>
	  if the result buffer is too small.
*/
int
dk4hostname_wc(wchar_t *buffer, size_t sz, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk4hnamew.h"

#if DK4_ON_WINDOWS
#ifndef WINDOWS_H_INCLUDED
#include <windows.h>
#define WINDOWS_H_INCLUDED 1
#endif
#endif

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



int
dk4hostname_wc(wchar_t *buffer, size_t sz, dk4_er_t *erp)
{
#if DK4_ON_WINDOWS
  DWORD		 s;
#endif
  int		 back = 0;
  if ((NULL != buffer) && (0 < sz)) {
#if DK4_ON_WINDOWS
    if ((dk4_um_t)sz <= (dk4_um_t)0xFFFFFFFFUL) {
      s = (DWORD)sz;
      if (GetComputerNameExW(ComputerNameNetBIOS, buffer, &s)) {
        if ((size_t)s < sz) {
	  buffer[(size_t)s] = L'\0';
	  back = 1;
	} else {
	  dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
	}
      } 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
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}