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/*
Copyright (C) 2015-2020, Dirk Krause
SPDX-License-Identifier: BSD-3-Clause
*/

/*
	WARNING: This file was generated by the dkct program (see
	http://dktools.sourceforge.net/ for details).
	Changes you make here will be lost if dkct is run again!
	You should modify the original source and run dkct on it.
	Original source: dk4rec19.ctr
*/

/**	@file dk4rec19.c The dk4rec19 module.
*/


#line 71 "dk4rec19.ctr"

#include "dk4conf.h"
#include "dk4rec19.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_utf16_to_c32(
  dk4_c32_t *dstb, size_t szdstb, const dk4_c16_t *src, dk4_er_t *erp
)
{
  dk4_utf16_decoder_t	 dec;
  size_t		 used	=	0;
  size_t		 rd	=	0;
  dk4_c32_t		 c32	=	dkC32(0);
  int			 back	=	0;

#if	DK4_USE_ASSERT
  assert(NULL != dstb);
  assert(0 < szdstb);
  assert(NULL != src);
#endif
  if ((NULL != dstb) && (NULL != src) && (0 < szdstb)) {
    back = 1;
    dk4utf16_init(&dec);
    while(((dk4_c16_t)0U != *src) && (1 == back) && (used < szdstb)) {
      switch(dk4utf16_add(&dec, *(src++))) {
        case DK4_EDSTM_FINISHED: {
	  c32 = dk4utf16_get(&dec);
	  dk4utf16_init(&dec);
	  dstb[used++] = c32;
	} break;
	case DK4_EDSTM_ERROR: {
	  back = 0;
	  dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 2, rd);
	} break;
      }
      if (0 != back) { rd++; }
    }
    if (used < szdstb) {
      dstb[used] = '\0';
    } else {
      dstb[szdstb - 1] = '\0';
      back = 0;
      dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
    }
    if (0 == dk4utf16_is_empty(&dec)) {
      back = 0;
      dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 2, rd);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}