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%%	options

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



%%	header

/**	@file
	Retrieve current timestamp (time as visible on the clock),
	compare timestamps, convert to text.
*/

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

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

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

#if DK4_ON_WINDOWS && (DK4_WIN_AVOID_CRT || DK4_WIN_DENY_CRT)
#ifndef WINDOWS_H_INCLUDED
#include <windows.h>
#define	WINDOWS_H_INCLUDED 1
#endif
#else
#if DK4_HAVE_SYS_TYPES_H
#ifndef SYS_TYPES_H_INCLUDED
#include <sys/types.h>
#define	SYS_TYPES_H_INCLUDED 1
#endif
#endif
#if DK4_TIME_WITH_SYS_TIME
#ifndef SYS_TIME_H_INCLUDED
#include <sys/time.h>
#define	SYS_TIME_H_INCLUDED 1
#endif
#ifndef TIME_H_INCLUDED
#include <time.h>
#define	TIME_H_INCLUDED 1
#endif
#else
#if DK4_HAVE_TIME_H
#ifndef TIME_H_INCLUDED
#include <time.h>
#define	TIME_H_INCLUDED 1
#endif
#else
#if DK4_HAVE_SYS_TIME_H
#ifndef SYS_TIME_H_INCLUDED
#include <sys/time.h>
#define	SYS_TIME_H_INCLUDED 1
#endif
#endif
#endif
#endif
#ifndef DK4TIME_H_INCLUDED
#include "dk4time.h"
#endif
#endif

#if DK4_ON_WINDOWS && (DK4_WIN_AVOID_CRT || DK4_WIN_DENY_CRT)
/**	Time as shown on the clock.
*/
typedef	SYSTEMTIME	dk4_clock_time_t;
#else
/**	Time as shown on the clock.
*/
typedef dk4_time_t	dk4_clock_time_t;
#endif

#ifdef __cplusplus
extern "C" {
#endif

/**	Retrieve current date and time.
	CRT on Windows: Optional.
	@param	dptr	Result buffer.
	@return	1 on success, 0 on error.
*/
int
dk4clocktime_get(dk4_clock_time_t *dptr);

/**	Compare two timestamps.
	CRT on Windows: Optional.
	@param	l	Left timestamp.
	@param	r	Right timestamp.
	@return	1 if l>r, 0 if l=r, -1 if l<r.
*/
int
dk4clocktime_compare(const dk4_clock_time_t *l, const dk4_clock_time_t *r);

/**	Convert timestamp to text ``yyyy-mm-dd hh:mm:ss''.
	CRT on Windows: Optional.
	@param	dptr	Result buffer address.
	@param	dsz	Result buffer size (number of dkChar).
	@param	clt	Timestamp to convert.
	@param	erp	Error report, may be NULL.
	@return 1 on success, 0 on error.
	
	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if dptr is NULL or dsz is 0,
	- DK4_E_MATH_OVERFLOW<br>
	  if a mathematical overflow occures in a size calculation,
	- DK4_E_BUFFER_TOO_SMALL<br>
	  if the buffer is too small.
*/
int
dk4clocktime_to_text(
  dkChar			*dptr,
  size_t			 dsz,
  const dk4_clock_time_t	*clt,
  dk4_er_t			*erp
);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk4conf.h"

#include "dk4types.h"

#include "dk4ctime.h"

#ifndef DK4REC22_H_INCLUDED
#include "dk4rec22.h"
#endif

#ifndef DK4TIME_H_INCLUDED
#include "dk4time.h"
#endif

#ifndef DK4TIMEDK_H_INCLUDED
#include "dk4timedk.h"
#endif

#ifndef DK4TIME08_H_INCLUDED
#include "dk4time08.h"
#endif



int
dk4clocktime_get(dk4_clock_time_t *dptr)
{
  if (NULL != dptr) {
#if DK4_ON_WINDOWS && (DK4_WIN_AVOID_CRT || DK4_WIN_DENY_CRT)
    GetLocalTime(dptr);
    return 1;
#else
    dk4time_get(dptr);
    return 1;
#endif
  } else {
    return 0;
  }
}



int
dk4clocktime_compare(const dk4_clock_time_t *l, const dk4_clock_time_t *r)
{
  int		 back = 0;
  if (NULL != l) {
    if (NULL != r) {
#if DK4_ON_WINDOWS && (DK4_WIN_AVOID_CRT || DK4_WIN_DENY_CRT)
      if (l->wYear > r->wYear) {
        back = 1;
      } else {
        if (l->wYear < r->wYear) {
	  back = -1;
	}
      }
      if (0 == back) {
        if (l->wMonth > r->wMonth) {
	  back = 1;
	} else {
	  if (l->wMonth < r->wMonth) {
	    back = -1;
	  }
	}
      }
      if (0 == back) {
        if (l->wDay > r->wDay) {
	  back = 1;
	} else {
	  if (l->wDay < r->wDay) {
	    back = -1;
	  }
	}
      }
      if (0 == back) {
        if (l->wHour > r->wHour) {
	  back = 1;
	} else {
	  if (l->wHour < r->wHour) {
	    back = -1;
	  }
	}
      }
      if (0 == back) {
        if (l->wMinute > r->wMinute) {
	  back = 1;
	} else {
	  if (l->wMinute < r->wMinute) {
	    back = -1;
	  }
	}
      }
      if (0 == back) {
        if (l->wSecond > r->wSecond) {
	  back = 1;
	} else {
	  if (l->wSecond < r->wSecond) {
	    back = -1;
	  }
	}
      }
#else
      if (*l > *r) {
        back = 1;
      } else {
        if (*l < *r) {
	  back = -1;
	}
      }
#endif
    } else {
      back = 1;
    }
  } else {
    if (NULL != r) {
      back = -1;
    }
  }
  return back;
}



/**	Convert timestamp to text ``yyyy-mm-dd hh:mm:ss''.
	@param	dptr	Result buffer address.
	@param	dsz	Result buffer size (number of dkChar).
	@param	clt	Timestamp to convert.
	@param	erp	Error report, may be NULL.
	@return 1 on success, 0 on error.
*/
int
dk4clocktime_to_text(
  dkChar			*dptr,
  size_t			 dsz,
  const dk4_clock_time_t	*clt,
  dk4_er_t			*erp
)
{
#if DK4_ON_WINDOWS && (DK4_WIN_AVOID_CRT || DK4_WIN_DENY_CRT)
  back = dk4time_to_text(
    dptr, dsz, DK4_TIMEFORMAT_DATE_TIME,
    clt->wYear, clt->wMonth, clt->wDay, clt->wHour, clt->wMinute, clt->wSecond,
    erp
  );
#else
#if DK4_CHAR_SIZE > 1
  char		 buf[32];
  int		 back = 0;
  if (0 != dk4time_as_text_c8(buf, sizeof(buf), clt, erp)) {
    back = dk4recode_char_to_dk(dptr, dsz, buf, erp);
  }
  return back;
#else
  return (dk4time_as_text(dptr, dsz, clt, erp));
#endif
#endif
}