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%%	options

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


%%	header

/**	@file	dk4memcpl.h	Copy memory within buffer from right to left.
*/


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

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


#ifdef __cplusplus
extern "C" {
#endif

/**	Copy memory from right to left.

	CRT on Windows: Not used.
	@param	dst	Destination buffer address.
	@param	src	Source buffer address.
	@param	sz	Number of bytes to copy.
	@param	erp	Error report, may be NULL.
*/
void
dk4mem_cpy_to_left(void *dst, const void *src, size_t sz, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif


%%	module


#include "dk4conf.h"

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

#include "dk4memcpl.h"



void
dk4mem_cpy_to_left(void *dst, const void *src, size_t sz, dk4_er_t *erp)
{
  unsigned char		*dptr;
  const unsigned char	*sptr;
#if	DK4_USE_ASSERT
  assert(NULL != dst);
  assert(NULL != src);
  assert(0 < sz);
#endif
  if ((NULL != dst) && (NULL != src) && (0 < sz)) {
    dptr = (unsigned char *)dst; sptr = (const unsigned char *)src;
    while (0 < sz--) { *(dptr++) = *(sptr++); }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
}