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%%	options

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


%%	header

/**	@file
	String recoding from ASCII to UTF-16.

	CRT on Windows: Not used.
*/

#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

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

#ifdef __cplusplus
extern "C" {
#endif

/**	Recode string from ASCII to UTF-16.
	@param	dstb	Destination buffer.
	@param	szdstb	Size of destination buffer (number of dk4_c16_t).
	@param	src	Source string to convert.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.
	
	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if src or dstb is NULL or szdstb is 0,
	- DK4_E_BUFFER_TOO_SMALL<br>
	  if dstb is too small,
	- DK4_E_SYNTAX<br>
	  with the number of successfully recoded characters in nelem if a
	  non-recodable character was found.
*/
int
dk4recode_ascii_to_utf16(
  dk4_c16_t *dstb, size_t szdstb, const char *src, dk4_er_t *erp
);

#ifdef __cplusplus
}
#endif


%%	module

#include "dk4conf.h"
#include "dk4rec07.h"
#include "dk4mem.h"
#include "dk4utf16.h"

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


int
dk4recode_ascii_to_utf16(
  dk4_c16_t *dstb, size_t szdstb, const char *src, dk4_er_t *erp
)
{
  dk4_c16_t	 buf[4];
  size_t	 sz;
  size_t	 used	=	0;
  size_t	 rdb	=	0;
  int		 back	=	0;
  unsigned char	 uc	=	'\0';
#if	DK4_USE_ASSERT
  assert(NULL != dstb);
  assert(0 < szdstb);
  assert(NULL != src);
#endif
  if ((NULL != dstb) && (NULL != src) && (0 < szdstb)) {
    back = 1;
    while(('\0' != *src) && (1 == back) && (used < szdstb)) {
      uc = (unsigned char)(*(src++));
      sz = DK4_SIZEOF(buf,dk4_c16_t);
      if (0 != dk4utf16_encode(buf, &sz, (dk4_c32_t)uc, erp)) {
        if ((szdstb - used) > sz) {
	  DK4_MEMCPY(&(dstb[used]),buf,(2 * sz));
	  used += sz;
	} else {
	  back = 0;
	  dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
	}
      } else {
        back = 0;
	dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 1, rdb);
      }
      if (0 != back) { rdb++; }
    }
    if (used < szdstb) {
      dstb[used] = (dk4_c16_t)0U;
    } else {
      dstb[szdstb - 1] = (dk4_c16_t)0U;
      back = 0;
      dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}