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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: dk4rec05.ctr
*/

/**	@file dk4rec05.c The dk4rec05 module.
*/


#line 88 "dk4rec05.ctr"

#include "dk4conf.h"
#include "dk4rec05.h"
#include "dk4mem.h"
#include "dk4ansi.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_ansi_to_utf8(const char *src, dk4_er_t *erp)
{
  dk4_er_t	 er;		/* Internal error report */
  unsigned char	 buf[8];	/* Current character UTF-8 encoded */
  size_t	 rdb	= 0;	/* Number of bytes read from input */
  size_t	 back	= 0;	/* Function result */
  size_t	 sz;		/* Size of UTF-8 encoded current character */
  dk4_c32_t	 c32;		/* Current 32 bit character */
  unsigned char	 uc;		/* Current source character */

#if	DK4_USE_ASSERT
  assert(NULL != src);
#endif
  if (NULL != src) {
    dk4error_init(&er);
    while ('\0' != *src) {
      uc = (unsigned char)(*(src++));
      rdb++;
      if (0 != dk4ansi_decode(&c32, uc)) {
        sz = sizeof(buf);
	if (0 != dk4utf8_encode(buf, &sz, c32, &er)) {
	  if ((SIZE_MAX - sz) < back) {
	    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); 
	  }
	  back += sz;
	} else {
	  dk4error_set_elsize_nelem(&er, DK4_E_SYNTAX, 1, rdb);
	}
      } else {
        dk4error_set_elsize_nelem(&er, DK4_E_SYNTAX, 1, rdb);
      }
    }
    if (SIZE_MAX == back) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
    back++;
    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_ansi_to_utf8(
  char *dstb, size_t szdstb, const char *src, dk4_er_t *erp
)
{
  unsigned char	 buf[8];
  size_t	 sz;
  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;
    while (('\0' != *src) && (1 == back) && (used < szdstb)) {
      if (0 != dk4ansi_decode(&c32, (unsigned char)(*(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, 1, rdb);
	}
      } else {
        back = 0;
	dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 1, rdb);
      }
      if (0 != 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);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}