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%%	options
copyright owner	=	Dirk Krause
copyright year	=	2017-xxxx
SPDX-License-Identifier:	BSD-3-Clause

%%	header

/**	@file	dk4mm.h	Make mode: Check if rebuilding destination file
	is necessary.
*/

#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


#ifdef	__cplusplus
extern "C" {
#endif

/**	Check whether or not it is necessary to rebuild a destination file.
	@param	dn	Destination file name.
	@param	sn	Source file name.
	@return	0 if the destination file is up to date, any non-0 value otherwise.
*/
int
dk4makemode_must_rebuild(const dkChar *dn, const dkChar *sn);

#ifdef	__cplusplus
}
#endif

/* vim: set ai sw=4 ts=4 : */
%%	module

#include "dk4conf.h"
#include "dk4mm.h"
#include "dk4statd.h"

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



int
dk4makemode_must_rebuild(const dkChar *dn, const dkChar *sn)
{
	dk4_stat_t	ds;
	dk4_stat_t	ss;
	int		 back	= 0;
#if	DK4_USE_ASSERT
  assert(NULL != dn);
  assert(NULL != sn);
#endif
	if ((NULL == dn) || (NULL == sn)) {
		goto finished;
	}
	if (0 != dk4stat(&ss, sn, NULL)) {
		/* Source file exists. */
		back = 1;
		if (0 != dk4stat(&ds, dn, NULL)) {
			/* Destination file exists. */
			if (ds.st_mtime > ss.st_mtime) {
				/* Destination file exists and is up to date. */
				back = 0;
			}
		}
	}
	else {
		/* Source file does not exist. */
	}

	finished:
	return back;
}


/* vim: set ai sw=4 ts=4 : */