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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: dk4rec18.ctr
*/

/**	@file dk4rec18.c The dk4rec18 module.
*/


#line 86 "dk4rec18.ctr"

#include "dk4conf.h"
#include "dk4rec18.h"
#include "dk4mem.h"
#include "dk4utf8.h"

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




#line 101 "dk4rec18.ctr"



size_t
dk4recode_size_c32_to_utf8(const dk4_c32_t *src, dk4_er_t *erp)
{
  dk4_er_t		 er;
  unsigned char		 buf[8];
  size_t		 sz;
  size_t		 rd	= 0;
  size_t		 back	= 0;
  dk4_c32_t		 c32	= dkC32(0);
#if	DK4_USE_ASSERT
  assert(NULL != src);
#endif
  if (NULL != src) {
    dk4error_init(&er);
    while (dkC32(0) != (c32 = *(src++))) {
      sz = sizeof(buf);
      if (0 != dk4utf8_encode(buf, &sz, c32, &er)) {
        if ((SIZE_MAX - sz) >= back) {
	  back += sz;
	  rd++;
	} else {
	  dk4error_set_simple_error_code(&er, DK4_E_MATH_OVERFLOW);
	}
      }
    }
    if (SIZE_MAX > back) {
      back++;
    } else {
      dk4error_set_simple_error_code(&er, DK4_E_MATH_OVERFLOW);
    }
    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_c32_to_utf8(
  char *dstb, size_t szdstb, const dk4_c32_t *src, dk4_er_t *erp
)
{
  unsigned char	 buf[8];
  size_t	 sz;
  size_t	 rd	=	0;
  size_t	 used	=	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) && (0 < szdstb) && (NULL != src)) {
    back = 1;
    while((dkC32(0) != *src) && (1 == back) && (used < szdstb)) {
      c32 = *(src++);
      sz = sizeof(buf);
      if (0 != dk4utf8_encode(buf, &sz, c32, erp)) {
        if ((szdstb - used) > sz) {
	  DK4_MEMCPY(&(dstb[used]),buf,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, 4, rd);
      }
      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);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}