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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2017-xxxx
SPDX-License-Identifier:	BSD-3-Clause

%%	header


/**	@file	dk4mao8dns.h	Print double without scientific notation.

The dk4ma_write_c8_double_no_sci_to_stream() function is intended to write
coordinates to PDF, PS and EPS output.

In contrast to the dk4c8dbl_double_to_stream() function from the dk4c8dbl
this function uses parameter eps to print 0 instead of
very small absolute values.

This module is in the libdk4c library, not libdk4maio8d, as it uses
the dk4_stream_t data type and related functions.

*/

#ifndef DK4CONF_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4conf.h"
#else
#include <dktools-4/dk4conf.h>
#endif
#endif

#ifndef DK4TYPES_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4types.h"
#else
#include <dktools-4/dk4types.h>
#endif
#endif

#ifndef DK4ERROR_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4error.h"
#else
#include <dktools-4/dk4error.h>
#endif
#endif

#ifndef	DK4STRM_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4strm.h"
#else
#include <dktools-4/dk4strm.h>
#endif
#endif

#ifndef STDLIB_H_INCLUDED
#include <stdlib.h>
#define STDLIB_H_INCLUDED 1
#endif

#ifdef	__cplusplus
extern "C" {
#endif

/**	Write a double value stored in a buffer to a stream, avoid
	scientific notation.
	@param	strm	Stream to write to.
	@param	buf		Buffer containing string representation of double value.
					The buffer contents is modified and probably
					damaged during operation.
	@param	erp		Error report, may be NULL.
	@return	1 on success, 0 on error.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if strm or buf is NULL,
	- 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,
	- DK4_E_MATH_OVERFLOW<br>
	  if the exponent is out of range for integer values,<br>
	- DK4_E_SYNTAX<br>
	  if input contains invalid characters.
*/
int
dk4ma_write_c8_double_string_no_sci_to_stream(
	dk4_stream_t	*strm,
	char			*buf,
	dk4_er_t		*erp
);

/**	Write double value to stream, avoid scientific notation.
	@param	strm		Stream to write to.
	@param	v			Value to write.
	@param	eps			Epsilon (values below epsilon are written as 0).
	@param	ex			Flag: Use exact representation.
	@param	min			Minimize text representation.
	@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.
	- 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,
	- DK4_E_MATH_OVERFLOW<br>
	  if the exponent is out of range for integer values,<br>
	- DK4_E_SYNTAX<br>
	  if input contains invalid characters.
*/
int
dk4ma_write_c8_double_no_sci_to_stream(
	dk4_stream_t	*strm,
	double			 v,
	double			 eps,
	int				 ex,
	int				 min,
	dk4_er_t		*erp
);

#ifdef	__cplusplus
}
#endif


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

%%	module


#include "dk4conf.h"

#ifndef	DK4MAO8DNS_H_INCLUDED
#include "dk4mao8dns.h"
#endif

#if	DK4_HAVE_STRING_H
#ifndef	STRING_H_INCLUDED
#include <string.h>
#define	STRING_H_INCLUDED	1
#endif
#endif

#if	DK4_HAVE_MATH_H
#ifndef	MATH_H_INCLUDED
#if	DK4_ON_WINDOWS
#ifndef	_USE_MATH_DEFINES
#define	_USE_MATH_DEFINES 1
#endif
#endif
#include <math.h>
#define	MATH_H_INCLUDED 1
#endif
#endif

#ifndef	DK4MAO8DBL_H_INCLUDED
#include "dk4mao8dbl.h"
#endif

#ifndef	DK4MAI8DDI_H_INCLUDED
#include "dk4mai8ddi.h"
#endif

#ifndef	DK4STR8_H_INCLUDED
#include "dk4str8.h"
#endif

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


$!trace-include



int
dk4ma_write_c8_double_string_no_sci_to_stream(
	dk4_stream_t	*strm,
	char			*buf,
	dk4_er_t		*erp
)
{
	char		*ptrex	= NULL;			/* Start of exponent */
	char		*ptrdd	= NULL;			/* Decimal dot */
	char		*ptrout	= NULL;			/* Character to output */
	const char	*endptr	= NULL;			/* First unusable exponent character */
	dk4_im_t	 dotpos	= (dk4_im_t)0L;	/* Dot position */
	dk4_im_t	 expon	= (dk4_im_t)0L;	/* Exponent */
	dk4_im_t	 i		= (dk4_im_t)0L;	/* Running index */
	int			 isneg	= 0;			/* Flag: Negative value */
	int			 res	= 0;			/* Conversion result */
	int			 back	= 0;			/* Result */
	$? "+ dk4ma_write_c8_double_string_no_sci_to_stream"
#if	DK4_USE_ASSERT
  assert(NULL != strm);
  assert(NULL != buf);
#endif
	if ((NULL != strm) && (NULL != buf)) {
		back = 1;
		if ('-' == *buf) {		$? ". negative"
			isneg = 1;
			buf++;
		}
#if TRACE_DEBUG
		else {					$? ". not negative"
		}
#endif
		/*
			Find exponent
		*/
		ptrex = strchr(buf, 'e');
		if (NULL == ptrex) { ptrex = strchr(buf, 'E'); }
		if (NULL != ptrex) {
			*(ptrex++) = '\0';	$? ". exponent=\"%s\"", ptrex
			if ('+' == *ptrex) { ptrex++; }
			res = dk4ma_input_c8_dec_dk4_im_t(&expon, ptrex, &endptr, 1, erp);
			if (0 == res) { expon = (dk4_im_t)0L; back = 0; }
			$? ". exponent = %d", (int)expon
		}
#if TRACE_DEBUG
		else {					$? ". no exponent"
		}
#endif
		/*	Find decimal dot
		*/
		ptrdd = strchr(buf, '.');
		if (NULL != ptrdd) {	$? ". have decimal dot"
			*ptrdd = '\0';
			dotpos = strlen(buf);
			dk4str8_cpy_to_left(ptrdd, &(ptrdd[1]));
		}
		else {					$? ". no decimal dot"
			dotpos = strlen(buf);
		}
		/*	Calculate dot position from original position and exponent
		*/
		dotpos += expon;		$? ". dot position = %d", (int)dotpos
		/*
			Write leading zero(s)
		*/
		if ((dk4_im_t)0L >= dotpos) {	$? ". leading zeros"
			if (0 != isneg) {
				if (0 == dk4stream_write_byte(strm, '-', erp)) { back = 0; }
				isneg = 0;
			}
			if (0 == dk4stream_write_byte(strm, '0', erp)) { back = 0; }
			if (0 == dk4stream_write_byte(strm, '.', erp)) { back = 0; }
			i = dotpos;
			while ((dk4_im_t)0L > i++) {
				if (0 == dk4stream_write_byte(strm, '0', erp)) { back = 0; }
			}
		}
#if TRACE_DEBUG
		else {							$? ". no leading zeros"
		}
#endif
		/*	Write digits from buffer
		*/
		if (0 != isneg) {				$? ". negative sign"
			if (0 == dk4stream_write_byte(strm, '-', erp)) { back = 0; }
		}
#if TRACE_DEBUG
		else {							$? ". no negative sign"
		}
#endif
		i = (dk4_im_t)0L;
		ptrout = buf;
		while ('\0' != *ptrout) {
			$? ". character %c", *ptrout
			$? ". dotpos=%d i=%d", (int)dotpos, (int)i
			if ((dotpos == i) && ((dk4_im_t)0L != dotpos)) {
				$? ". must write dot"
				if (0 == dk4stream_write_byte(strm, '.', erp)) {
					back = 0;		$? "! write error (dot)"
				}
			}
			$? ". going to write character"
			if (0 == dk4stream_write_byte(strm, *(ptrout++), erp)) {
				back = 0;			$? "! write error (character)"
			}
			$? ". character was written"
			i++;
		}
		/*	Append trailing zero(s)
		*/
		$? ". appending trailing zeros i=%d dotpos=%d", (int)i, (int)dotpos
		while (i++ < dotpos) {
			if (0 == dk4stream_write_byte(strm, '0', erp)) {
				back = 0;			$? "! write error (trailing zero)"
			}
		}
	}
	else {
		dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
	}
	$? "- dk4ma_write_c8_double_string_no_sci_to_stream %d", back
	return  back;
}



int
dk4ma_write_c8_double_no_sci_to_stream(
	dk4_stream_t	*strm,
	double			 v,
	double			 eps,
	int				 ex,
	int				 min,
	dk4_er_t		*erp
)
{
	char	 buf[16*sizeof(double)];
	size_t	 szbuf	= sizeof(buf);
	int		 back	= 0;
	$? "+ dk4ma_write_c8_double_no_sci_to_stream %g", v
#if	DK4_USE_ASSERT
  assert(NULL != strm);
#endif
	if (NULL != strm) {
		if (fabs(v) < eps) {	$? ". 0"
			back = dk4stream_write_byte(strm, '0', erp);
		}
		else {					$? ". not 0"
			if (0 != dk4ma_write_c8_double(buf, szbuf, v, ex, min, erp)) {
				$? ". buf=\"%s\"", buf
				back = dk4ma_write_c8_double_string_no_sci_to_stream(
					strm, buf, erp
				);
			}
#if TRACE_DEBUG
			else {				$? "! dk4ma_write_c8_double"
			}
#endif
		}
	}
	else {
		dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
	}
	$? "- dk4ma_write_c8_double_no_sci_to_stream %d", back
	return back;
}


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