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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2016-xxxx
license			=	bsd

%%	header

/**	@file	dk4c8dbl.h	Write double value to file or stream
	without scientific notation.
*/

#ifndef	DK4CONF_H_INCLUDED
#include <dk4conf.h>
#endif

#ifndef	DK4TYPES_H_INCLUDED
#include <dk4types.h>
#endif

#ifndef	STDIO_H_INCLUDED
#include <stdio.h>
#define	STDIO_H_INCLUDED 1
#endif

#ifndef	DK4ERROR_H_INCLUDED
#include <dk4error.h>
#endif

#ifndef	DK4STRM_H_INCLUDED
#include <dk4strm.h>
#endif


#ifdef	__cplusplus
extern "C" {
#endif

/**	Write double value to stream, avoid scientific notation.
	@param	strm	Stream to write to.
	@param	v		Value to write.
	@param	exact	Flag: Exact representation.
	@param	minim	Flag: Minimize an exact representation.
	@param	erp		Error report, may be NULL.
	@return	1 on success, 0 on error.
*/

int
dk4c8dbl_double_to_stream(
	dk4_stream_t	*strm,
	double			 v,
	int				 exact,
	int				 minim,
	dk4_er_t		*erp
);


/**	Write double value to stream, avoid scientific notation.
	@param	fipo	File to write to.
	@param	v		Value to write.
	@param	exact	Flag: Exact representation.
	@param	minim	Flag: Minimize an exact representation.
	@param	erp		Error report, may be NULL.
	@return	1 on success, 0 on error.
*/

int
dk4c8dbl_double_to_file(
	FILE			*fipo,
	double			 v,
	int				 exact,
	int				 minim,
	dk4_er_t		*erp
);


/**	Write double string to stream, avoid scientific notation.
	@param	fipo	File to write to.
	@param	str		String containing the value.
	@param	erp		Error report, may be NULL.
	@return	1 on success, 0 on error.
*/

int
dk4c8dbl_str_double_to_file(
	FILE			*fipo,
	const char		*str,
	dk4_er_t		*erp
);


#ifdef	__cplusplus
}
#endif


/* vim: set ai sw=4 ts=4 : */
%%	module

#include "dk4c8dbl.h"

#if	DK4_HAVE_STRING_H
#include <string.h>
#endif

#if	DK4_HAVE_STDLIB_H
#include <stdlib.h>
#endif

#include "dk4mao8dbl.h"
#include "dk4mai8ddi.h"
#include "dk4str8.h"



$!trace-include



/**	Write character to stream or file.
	@param	dptr	Destination for write operations.
	@param	dtp		Type of dptr: 0=FILE, 1=dk4_stream_t.
	@param	c		Character 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 opened for writing,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flusing data downwards failed.
*/
static
int
dk4c8dbl_i_byte_to_void(
	void			*dptr,
	int				 dtp,
	char			 c,
	dk4_er_t		*erp
)
{
	int		 back;
	switch (dtp) {
		case 1: {
			back = dk4stream_write_byte((dk4_stream_t*)dptr, c, erp);
		} break;
		default: {
			if (EOF != fputc(c, (FILE *)dptr)) {
				back = 1;
			}
			else {
				back = 0;
				dk4error_set_simple_error_code(erp, DK4_E_WRITE_FAILED);
			}
		} break;
	}
	return back;
}



static
void
dk4c8dbl_i_cut_trailing_zeroes(char *str)
{
	char	*cutpos	= NULL;
	$? "+ dk4c8dbl_i_cut_trailing_zeroes \"%!8s\"", str
	while ('\0' != *str) {				$? ". c = \"%c\"", *str
		if ('0' == *str) {				$? ". 0"
			if (NULL == cutpos) {		$? ". new cut position"
				cutpos = str;
			}
		}
		else {							$? ". not 0"
			cutpos = NULL;				$? ". can not cut"
		}
		str++;
	}
	if (NULL != cutpos) {				$? ". can cut"
		*cutpos = '\0';
	}
	$? "- dk4c8dbl_i_cut_trailing_zeroes"
}



/**	Write double value to stream or file, avoid scientific notation.
	@param	dptr	Destination for write operations.
	@param	dtp		Type of dptr: 0=FILE, 1=dk4_stream_t.
	@param	str		String representation of double.
	@param	erp		Error report, may be NULL.
	@return	1 on success, 0 on error.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if dptr is NULL,
	- DK4_E_BUFFER_TOO_SMALL<br>
	  if the internal destination buffer is too small to store the string,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flusing data downwards failed.
*/
static
int
dk4c8dbl_i_str_to_void(
	void			*dptr,
	int				 dtp,
	char			*str,
	dk4_er_t		*erp
)
{
	char		*eptr;						/* Position of 'e' */
	char		*ddptr;						/* Position of decimal dot */
	char		*p1;						/* Traverse string */
	const char	*endptr	= NULL;				/* End of processed data exponent */
	dk4_im_t	 expo	= (dk4_im_t)0L;		/* Exponent value */
	size_t		 dotpos;					/* Position of decimal dot */
	int			 isneg	= 0;				/* Flag: Negative number */
	int			 back	= 0;				/* Function result */
	int			 res;						/* Conversion result */
	$? "+ dk4c8dbl_i_str_to_void \"%!8s\"", str
	/*
		Check for scientific notation
	*/
	eptr = strchr(str, 'e');
	if (NULL == eptr) { eptr = strchr(str, 'E'); }
	if (NULL != eptr) {					$? ". exponent found"
		/*
			Scientific notation found, analyse string first
			-----------------------------------------------
		*/
		/*
			Check for negative value (unary minus)
		*/
		if ('-' == *str) {
			isneg = 1;
			str++;
		}
		/*
			Retrieve exponent value
		*/
		*(eptr++) = '\0';
		res = dk4ma_input_c8_dec_dk4_im_t( &expo, eptr, &endptr, 1, erp);
		if (0 == res) {
			expo = (dk4_im_t)0L;
		}
		$? ". expo = %ld", (long)expo
		/*
			Find position of decimal dot and convert string digit sequence
		*/
		ddptr = strchr(str, '.');
		if (NULL != ddptr) {
			*ddptr = '\0';
			dotpos = strlen(str);
			dk4str8_cpy_to_left(ddptr, &(ddptr[1]));
			dk4c8dbl_i_cut_trailing_zeroes(&(ddptr[1]));
		}
		else {
			dotpos = strlen(str);
		}
		/*
			Calculate real position of decimal dot.
		*/
		expo += (dk4_im_t)dotpos;
		/*
			Remove leading zeroes
		*/
		while (('0' == *str) && ('\0' != str[1])) {
			str++;
			expo--;
		}
		/*
			Now write the number
			--------------------
		*/
		back = 1;
		/*
			Write unary minus for negative numbers
		*/
		if (0 != isneg) {
			if (0 == dk4c8dbl_i_byte_to_void(dptr, dtp, '-', erp)) {
				back = 0;
			}
		}
		if ((dk4_im_t)0L >= expo) {
			/*
				Decimal dot is before first digit in string
			*/
			if (0 == dk4c8dbl_i_byte_to_void(dptr, dtp, '0', erp)) {
				back = 0;
			}
			if (0 == dk4c8dbl_i_byte_to_void(dptr, dtp, '.', erp)) {
				back = 0;
			}
			while ((dk4_im_t)0L > expo++) {
				if (0 == dk4c8dbl_i_byte_to_void(dptr, dtp, '0', erp)) {
					back = 0;
				}
			}
			p1   = str;
			while ('\0' != *p1) {
				if (0 == dk4c8dbl_i_byte_to_void(dptr, dtp, *(p1++), erp)) {
					back = 0;
				}
			}
		}
		else {
			/*
				Decimal dot is in string or after string
			*/
			p1	= str;
			while ('\0' != *p1) {
				if (0 == dk4c8dbl_i_byte_to_void(dptr, dtp, *p1, erp)) {
					back = 0;
				}
				expo--;
				p1++;
				if ((dk4_im_t)0L == expo) {
					if ('\0' != *p1) {
						if (0 == dk4c8dbl_i_byte_to_void(dptr, dtp, '.', erp)) {
							back = 0;
						}
					}
				}
			}
			while ((dk4_im_t)0L < expo--) {
				if (0 == dk4c8dbl_i_byte_to_void(dptr, dtp, '0', erp)) {
					back = 0;
				}
			}
		}
	}
	else {								$? ". no exponent"
		/*
			No exponent, can ship out string as is
			--------------------------------------
		*/
		/*
			Remove leading zeroes
		*/
		while (('0' == *str) && ('\0' != str[1])) {
			str++;
		}
		/*
			Remove trailing zeroes
		*/
		ddptr = strchr(str, '.');
		if (NULL != ddptr) {
			ddptr++;
			ddptr++;
			dk4c8dbl_i_cut_trailing_zeroes(ddptr);
			$? ". str = \"%!8s\"", str
		}
		/*
			Write output
		*/
		back = 1;
		p1   = str;
		if ('.' == *str) {
			if (0 == dk4c8dbl_i_byte_to_void(dptr, dtp, '0', erp)) {
				back = 0;
			}
		}
		while ('\0' != *p1) {
			if (0 == dk4c8dbl_i_byte_to_void(dptr, dtp, *(p1++), erp)) {
				back = 0;
			}
		}
	}
	$? "- dk4c8dbl_i_str_to_void"
	return back;
}



/**	Write double value to stream or file, avoid scientific notation.
	@param	dptr	Destination for write operations.
	@param	dtp		Type of dptr: 0=FILE, 1=dk4_stream_t.
	@param	v		Value to write.
	@param	exact	Flag: Exact representation.
	@param	minim	Flag: Minimize an exact representation.
	@param	erp		Error report, may be NULL.
	@return	1 on success, 0 on error.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if dptr is NULL,
	- DK4_E_BUFFER_TOO_SMALL<br>
	  if the internal destination buffer is too small to store the string,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flusing data downwards failed.
*/
static
int
dk4c8dbl_i_double_to_void(
	void			*dptr,
	int				 dtp,
	double			 v,
	int				 exact,
	int				 minim,
	dk4_er_t		*erp
)
{
	char	 buf[16*sizeof(double)];
	size_t	 szbuf	= sizeof(buf);
	int		 res	= 0;
	int		 back	= 0;

	if (NULL != dptr) {
		res = dk4ma_write_c8_double(buf, szbuf, v, exact, minim, erp);
		if (0 != res) {
			back = dk4c8dbl_i_str_to_void(dptr, dtp, buf, erp);
		}
	}
	else {
		dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
	}
	return back;
}



int
dk4c8dbl_double_to_stream(
	dk4_stream_t	*strm,
	double			 v,
	int				 exact,
	int				 minim,
	dk4_er_t		*erp
)
{
	return (dk4c8dbl_i_double_to_void((void *)strm, 1, v, exact, minim, erp));
}



int
dk4c8dbl_double_to_file(
	FILE			*fipo,
	double			 v,
	int				 exact,
	int				 minim,
	dk4_er_t		*erp
)
{
	return (dk4c8dbl_i_double_to_void((void *)fipo, 0, v, exact, minim, erp));
}



int
dk4c8dbl_str_double_to_file(
	FILE			*fipo,
	const char		*str,
	dk4_er_t		*erp
)
{
	char	 buf[16*sizeof(double)];
	int		 back	= 0;

	if ((NULL != fipo) && (NULL != str)) {
		if (strlen(str) < sizeof(buf)) {
			strcpy(buf, str);
			back = dk4c8dbl_i_str_to_void((void *)fipo, 0, buf, erp);
		}
		else {
			dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
		}
	}
	else {
		dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
	}
	return back;
}



/* vim: set ai sw=4 ts=4 : */