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%%	options

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



%%	header

/**	@file
	String output over dk4_stream_t API,
	16 bit character strings.

	CRT on Windows: Not used.
*/

#include "dk4conf.h"
#include "dk4types.h"
#include "dk4strm.h"

#ifdef __cplusplus
extern "C" {
#endif

/**	Write one 32 bit character string to stream.
	@param	strm	Stream to write to.
	@param	txt	Text string to write.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.
	
	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if strm is null or not set up for writing,
	- DK4_E_ENCODING_FAILED<br>
	  if it is not possible to encode c32 to the output encoding for the
	  stream,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/
int
dk4stream_c16_puts(dk4_stream_t *strm, const dk4_c16_t *txt, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk4strmo16.h"
#include "dk4strmo32.h"
#include "dk4enc.h"
#include "dk4utf16.h"


int
dk4stream_c16_puts(dk4_stream_t *strm, const dk4_c16_t *txt, dk4_er_t *erp)
{
  dk4_utf16_decoder_t	enc;
  dk4_c16_t		c16;
  dk4_c32_t		c32;
  int		 	back	=	0;
  char			c8;
  if ((NULL != strm) && (NULL != txt)) {
    if (0 != ((strm->fl) & DK4_STREAM_WRITE)) {
      switch (strm->oenc) {
        case DK4_FILE_ENCODING_UTF16_LE:
	case DK4_FILE_ENCODING_UTF16_BE:
	{
	  back = 1;
	  while((0 != *txt) && (1 == back)) {
	    c16 = *(txt++);
	    if (DK4_FILE_ENCODING_UTF16_LE == strm->oenc) {
	      c8 = (char)(c16 & 0x00FF);
	      if (0 == dk4stream_write_byte(strm, c8, erp)) {
	        back = 0;
	      } else {
	        c8 = (char)((c16 >> 8) & 0x00FF);
		if (0 == dk4stream_write_byte(strm, c8, erp)) {
		  back = 0;
		}
	      }
	    } else {
	      c8 = (char)((c16 >> 8) & 0x00FF);
	      if (0 == dk4stream_write_byte(strm, c8, erp)) {
	        back = 0;
	      } else {
	        c8 = (char)(c16 & 0x00FF);
		if (0 == dk4stream_write_byte(strm, c8, erp)) {
		  back = 0;
		}
	      }
	    }
	  }
	} break;
	default: {
	  back = 1;
	  dk4utf16_init(&enc);
	  while((0 != *txt) && (1 == back)) {
	    switch (dk4utf16_add(&enc, *(txt++))) {
	      case DK4_EDSTM_FINISHED: {
	        c32 = dk4utf16_get(&enc);
		dk4utf16_init(&enc);
		if (0 == dk4stream_c32_putc(strm, c32, erp)) {
		  back = 0;
		}
	      } break;
	      case DK4_EDSTM_ERROR: {
	        back = 0;
		dk4error_set_simple_error_code(erp,DK4_E_DECODING_FAILED);
	      } break;
	    }
	  }
	  if (0 == dk4utf16_is_empty(&enc)) {
	    back = 0;
	    dk4error_set_simple_error_code(erp,DK4_E_DECODING_FAILED);
	  }
	} break;
      }
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}