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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: dk4rec04.ctr
*/

/**	@file dk4rec04.c The dk4rec04 module.
*/


#line 87 "dk4rec04.ctr"

#include "dk4conf.h"
#include "dk4rec04.h"
#include "dk4utf8.h"

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


size_t
dk4recode_size_utf8_to_ascii(const char *src, dk4_er_t *erp)
{
  dk4_er_t		 er;
  dk4_utf8_decoder_t	 dec;
  size_t		 rdb	= 0;
  size_t		 back	= 0;
  dk4_c32_t		 c32;
#if	DK4_USE_ASSERT
  assert(NULL != src);
#endif
  if (NULL != src) {
    /*	Initialize data structures.
    */
    dk4error_init(&er);
    dk4utf8_init(&dec);
    /*	Process source string.
    */
    while ('\0' != *src) {
      rdb++;
      switch(dk4utf8_add(&dec, (unsigned char)(*(src++)))) {
        case DK4_EDSTM_FINISHED: {
	  c32 = dk4utf8_get(&dec);
	  dk4utf8_init(&dec);
	  if (dkC32(0x00000100) > c32) {
	    if (SIZE_MAX == back) {
	      dk4error_set_simple_error_code(&er, DK4_E_MATH_OVERFLOW);
	    } else {
	      back++;
	    }
	  } else {
	    dk4error_set_elsize_nelem(&er, DK4_E_SYNTAX, 1, rdb);
	  }
	} break;
	case DK4_EDSTM_ERROR: {
	  dk4error_set_elsize_nelem(&er, DK4_E_SYNTAX, 1, rdb);
	} break;
      }
    }
    if (0 == dk4utf8_is_empty(&dec)) {
      dk4error_set_elsize_nelem(&er, DK4_E_SYNTAX, 1, rdb);
    }
    /*	Add one for the finalizer.
    */
    if (SIZE_MAX == back) {
      dk4error_set_simple_error_code(&er, DK4_E_MATH_OVERFLOW);
    } else {
      back++;
    }
    /*	On error return 0 and pass error code.
    */
    if (DK4_E_NONE != er.ec) {
      back = 0;
      dk4error_copy(erp, &er);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}



int
dk4recode_utf8_to_ascii(
  char *dstb, size_t szdstb, const char *src, dk4_er_t *erp
)
{
  dk4_utf8_decoder_t	 dec;
  size_t		 used	=	0;
  size_t		 rdb	=	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;
    dk4utf8_init(&dec);
    while(('\0' != *src) && (1 == back) && (used < szdstb)) {
      switch(dk4utf8_add(&dec, (unsigned char)(*(src++)))) {
        case DK4_EDSTM_FINISHED: {
	  c32 = dk4utf8_get(&dec);
	  dk4utf8_init(&dec);
	  if (dkC32(0x00000100) > c32) {
	    dstb[used++] = (char)c32;
	  } else {
	    back = 0;
	    dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 1, rdb);
	  }
	} break;
	case DK4_EDSTM_ERROR: {
	  back = 0;
	  dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 1, rdb);
	} break;
      }
      if(back) { rdb++; }
    }
    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 == dk4utf8_is_empty(&dec)) {
      back = 0;
      dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 1, rdb);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}