/*
 *  M_APM  -  mapm_fpf.c
 *
 *  Copyright (C) 2001 - 2007   Michael C. Ring
 *
 *  Permission to use, copy, and distribute this software and its
 *  documentation for any purpose with or without fee is hereby granted,
 *  provided that the above copyright notice appear in all copies and
 *  that both that copyright notice and this permission notice appear
 *  in supporting documentation.
 *
 *  Permission to modify the software is granted. Permission to distribute
 *  the modified code is granted. Modifications are to be distributed by
 *  using the file 'license.txt' as a template to modify the file header.
 *  'license.txt' is available in the official MAPM distribution.
 *
 *  This software is provided "as is" without express or implied warranty.
 */

/*
 *
 *      This file contains the Fixed Point Formatting functions
 *
 */

#include "pgAdmin3.h"
#include "pgscript/utilities/mapm-lib/m_apm_lc.h"
#include <ctype.h>

/****************************************************************************/
char	*m_apm_to_fixpt_stringexp(int dplaces, M_APM atmp,
                                  char ch_radx, char ch_sep, int ct_sep)
{
	int	places, xp, dl, ii;
	char	*cpr;

	places = dplaces;

	dl = atmp->m_apm_datalength;
	xp = atmp->m_apm_exponent;

	if (places < 0)				/* show ALL digits */
	{
		if (xp < 0)
			ii = dl - xp;
		else
		{
			if (dl > xp)
				ii = dl;
			else
				ii = xp;
		}
	}
	else
	{
		ii = places;

		if (xp > 0)
			ii += xp;
	}

	if (ct_sep != 0 && ch_sep != 0 && xp > 0)
		ii += xp / ct_sep;

	if ((cpr = (char *)MAPM_MALLOC((ii + 32) * sizeof(char))) == NULL)
		return(NULL);

	m_apm_to_fixpt_stringex(cpr, places, atmp, ch_radx, ch_sep, ct_sep);

	return(cpr);
}
/****************************************************************************/
void	m_apm_to_fixpt_stringex(char *s, int dplaces, M_APM atmp,
                                char ch_radix, char ch_sep, int count_sep)
{
	M_APM   btmp;
	char    ch, *cpd, *cps;
	int	ii, jj, kk, ct, dl, xp, no_sep_flg, places;

	btmp       = M_get_stack_var();
	places     = dplaces;
	cpd        = s;
	no_sep_flg = FALSE;

	m_apm_absolute_value(btmp, atmp);	/* do conversion of positive number */

	if (ch_sep == 0 || count_sep == 0)	/* no separator char OR count */
		no_sep_flg = TRUE;

	/* determine how much memory to get for the temp string */

	dl = btmp->m_apm_datalength;
	xp = btmp->m_apm_exponent;

	if (places < 0)				/* show ALL digits */
	{
		if (xp < 0)
			ii = dl - xp;
		else
		{
			if (dl > xp)
				ii = dl;
			else
				ii = xp;
		}
	}
	else
	{
		ii = places;

		if (xp > 0)
			ii += xp;
	}

	if ((cps = (char *)MAPM_MALLOC((ii + 32) * sizeof(char))) == NULL)
	{
		/* fatal, this does not return */

		M_apm_log_error_msg(M_APM_FATAL,
		                    "\'m_apm_to_fixpt_stringex\', Out of memory");
	}

	m_apm_to_fixpt_string(cps, places, btmp);

	/*
	 *  the converted string may be all 'zero', 0.0000...
	 *  if so and the original number is negative,
	 *  do NOT set the '-' sign of our output string.
	 */

	if (atmp->m_apm_sign == -1)		/* if input number negative */
	{
		kk = 0;
		jj = 0;

		while (TRUE)
		{
			ch = cps[kk++];
			if ((ch == '\0') || (jj != 0))
				break;

			if (isdigit((int)ch))
			{
				if (ch != '0')
					jj = 1;
			}
		}

		if (jj)
			*cpd++ = '-';
	}

	ct = M_strposition(cps, (char *) ".");      /* find the default (.) radix char */

	if (ct == -1)			   /* if not found .. */
	{
		strcat(cps, ".");               /* add one */
		ct = M_strposition(cps, (char *) ".");   /* and then find it */
	}

	if (places == 0)		   /* int format, terminate at radix char */
		cps[ct] = '\0';
	else
		cps[ct] = ch_radix;		   /* assign the radix char */

	/*
	 *  if the number is small enough to not have any separator char's ...
	 */

	if (ct <= count_sep)
		no_sep_flg = TRUE;

	if (no_sep_flg)
	{
		strcpy(cpd, cps);
	}
	else
	{
		jj = 0;
		kk = count_sep;
		ii = ct / count_sep;

		if ((ii = ct - ii * count_sep) == 0)
			ii = count_sep;

		while (TRUE)				/* write out the first 1,2  */
		{
			/* (up to count_sep) digits */
			*cpd++ = cps[jj++];

			if (--ii == 0)
				break;
		}

		while (TRUE)				/* write rest of the string   */
		{
			if (kk == count_sep)		/* write a new separator char */
			{
				if (jj != ct)			/* unless we're at the radix  */
				{
					*cpd++ = ch_sep;		/* note that this also disables */
					kk = 0;			/* the separator char AFTER     */
				}				/* the radix char               */
			}

			if ((*cpd++ = cps[jj++]) == '\0')
				break;

			kk++;
		}
	}

	MAPM_FREE(cps);
	M_restore_stack(1);
}
/****************************************************************************/
void	m_apm_to_fixpt_string(char *ss, int dplaces, M_APM mtmp)
{
	M_APM   ctmp;
	void	*vp;
	int	places, i2, ii, jj, kk, xp, dl, numb;
	UCHAR   *ucp, numdiv, numrem;
	char	*cpw, *cpd, sbuf[128];

	ctmp   = M_get_stack_var();
	vp     = NULL;
	cpd    = ss;
	places = dplaces;

	/* just want integer portion if places == 0 */

	if (places == 0)
	{
		if (mtmp->m_apm_sign >= 0)
			m_apm_add(ctmp, mtmp, MM_0_5);
		else
			m_apm_subtract(ctmp, mtmp, MM_0_5);

		m_apm_to_integer_string(cpd, ctmp);

		M_restore_stack(1);
		return;
	}

	if (places > 0)
		M_apm_round_fixpt(ctmp, places, mtmp);
	else
		m_apm_copy(ctmp, mtmp);	  /* show ALL digits */

	if (ctmp->m_apm_sign == 0)        /* result is 0 */
	{
		if (places < 0)
		{
			cpd[0] = '0';		  /* "0.0" */
			cpd[1] = '.';
			cpd[2] = '0';
			cpd[3] = '\0';
		}
		else
		{
			memset(cpd, '0', (places + 2));	/* pre-load string with all '0' */
			cpd[1] = '.';
			cpd[places + 2] = '\0';
		}

		M_restore_stack(1);
		return;
	}

	xp   = ctmp->m_apm_exponent;
	dl   = ctmp->m_apm_datalength;
	numb = (dl + 1) >> 1;

	if (places < 0)
	{
		if (dl > xp)
			jj = dl + 16;
		else
			jj = xp + 16;
	}
	else
	{
		jj = places + 16;

		if (xp > 0)
			jj += xp;
	}

	if (jj > 112)
	{
		if ((vp = (void *)MAPM_MALLOC((jj + 16) * sizeof(char))) == NULL)
		{
			/* fatal, this does not return */

			M_apm_log_error_msg(M_APM_FATAL,
			                    "\'m_apm_to_fixpt_string\', Out of memory");
		}

		cpw = (char *)vp;
	}
	else
	{
		cpw = sbuf;
	}

	/*
	 *  at this point, the number is non-zero and the the output
	 *  string will contain at least 1 significant digit.
	 */

	if (ctmp->m_apm_sign == -1) 	  /* negative number */
	{
		*cpd++ = '-';
	}

	ucp = ctmp->m_apm_data;
	ii  = 0;

	/* convert MAPM num to ASCII digits and store in working char array */

	while (TRUE)
	{
		M_get_div_rem_10((int)(*ucp++), &numdiv, &numrem);

		cpw[ii++] = numdiv + '0';
		cpw[ii++] = numrem + '0';

		if (--numb == 0)
			break;
	}

	i2 = ii;		/* save for later */

	if (places < 0)		/* show ALL digits */
	{
		places = dl - xp;

		if (places < 1)
			places = 1;
	}

	/* pad with trailing zeros if needed */

	kk = xp + places + 2 - ii;

	if (kk > 0)
		memset(&cpw[ii], '0', kk);

	if (xp > 0)          /* |num| >= 1, NO lead-in "0.nnn" */
	{
		ii = xp + places + 1;
		jj = 0;

		for (kk = 0; kk < ii; kk++)
		{
			if (kk == xp)
				cpd[jj++] = '.';

			cpd[jj++] = cpw[kk];
		}

		cpd[ii] = '\0';
	}
	else			/* |num| < 1, have lead-in "0.nnn" */
	{
		jj = 2 - xp;
		ii = 2 + places;
		memset(cpd, '0', (ii + 1));	/* pre-load string with all '0' */
		cpd[1] = '.';		/* assign decimal point */

		for (kk = 0; kk < i2; kk++)
		{
			cpd[jj++] = cpw[kk];
		}

		cpd[ii] = '\0';
	}

	if (vp != NULL)
		MAPM_FREE(vp);

	M_restore_stack(1);
}
/****************************************************************************/
void	M_apm_round_fixpt(M_APM btmp, int places, M_APM atmp)
{
	int	xp, ii;

	xp = atmp->m_apm_exponent;
	ii = xp + places - 1;

	M_set_to_zero(btmp); /* assume number is too small so the net result is 0 */

	if (ii >= 0)
	{
		m_apm_round(btmp, ii, atmp);
	}
	else
	{
		if (ii == -1)	/* next digit is significant which may round up */
		{
			if (atmp->m_apm_data[0] >= 50)	/* digit >= 5, round up */
			{
				m_apm_copy(btmp, atmp);
				btmp->m_apm_data[0] = 10;
				btmp->m_apm_exponent += 1;
				btmp->m_apm_datalength = 1;
				M_apm_normalize(btmp);
			}
		}
	}
}
/****************************************************************************/