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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd


%%	header

/**	@file
	String recoding from 32 bit to ASCII.

	CRT on Windows: Not used.
*/

#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif

#ifndef DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif

#ifdef __cplusplus
extern "C" {
#endif

/**	Recode string from 32 bit to ASCII.
	@param	dstb	Destination buffer.
	@param	szdstb	Size of destination buffer (number of bytes).
	@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_c32_to_ascii(
  char *dstb, size_t szdstb, const dk4_c32_t *src, dk4_er_t *erp
);

#ifdef __cplusplus
}
#endif

%%	module

#include "dk4rec14.h"


int
dk4recode_c32_to_ascii(
  char *dstb, size_t szdstb, const dk4_c32_t *src, dk4_er_t *erp
)
{
  size_t	 rd	=	0;
  size_t	 used	=	0;
  dk4_c32_t	 c32	=	dkC32(0);
  int		 back	=	0;

  if ((NULL != dstb) && (0 < szdstb) && (NULL != src)) {
    back = 1;
    while((dkC32(0) != *src) && (1 == back) && (used < szdstb)) {
      c32 = *(src++);
      if (dkC32(0x00000100) > c32) {
        dstb[used++] = (char)c32;
      } 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;
}