/*
 *  M_APM  -  mapm_set.c
 *
 *  Copyright (C) 1999 - 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 functions necessary to get C 'longs' and
 *	'strings' into the MAPM number system. It also contains the function
 *	to get a string from a MAPM number.
 *
 */

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

static	char *M_buf  = NULL;
static  int   M_lbuf = 0;
static  const char *M_set_string_error_msg = "\'m_apm_set_string\', Out of memory";

/****************************************************************************/
void	M_free_all_set()
{
	if (M_lbuf != 0)
	{
		MAPM_FREE(M_buf);
		M_buf  = NULL;
		M_lbuf = 0;
	}
}
/****************************************************************************/
void	m_apm_set_long(M_APM atmp, long mm)
{
	int     len, ii, nbytes;
	char	*p, *buf, ch, buf2[64];

	/* if zero, return right away */

	if (mm == 0)
	{
		M_set_to_zero(atmp);
		return;
	}

	M_long_2_ascii(buf2, mm);     /* convert long -> ascii in base 10 */
	buf = buf2;

	if (mm < 0)
	{
		atmp->m_apm_sign = -1;
		buf++;                     /* get past '-' sign */
	}
	else
	{
		atmp->m_apm_sign = 1;
	}

	len = strlen(buf);
	atmp->m_apm_exponent = len;

	/* least significant nibble of ODD data-length must be 0 */

	if ((len & 1) != 0)
	{
		buf[len] = '0';
	}

	/* remove any trailing '0' ... */

	while (TRUE)
	{
		if (buf[--len] != '0')
			break;
	}

	atmp->m_apm_datalength = ++len;

	nbytes = (len + 1) >> 1;
	p = buf;

	for (ii = 0; ii < nbytes; ii++)
	{
		ch = *p++ - '0';
		atmp->m_apm_data[ii] = 10 * ch + *p++ - '0';
	}
}
/****************************************************************************/
void	m_apm_set_string(M_APM ctmp, const char *s_in)
{
	char	ch, *cp, *s, *p;
	void	*vp;
	int	i, j, zflag, exponent, sign;

	if (M_lbuf == 0)
	{
		M_lbuf = 256;
		if ((M_buf = (char *)MAPM_MALLOC(256)) == NULL)
		{
			/* fatal, this does not return */

			M_apm_log_error_msg(M_APM_FATAL, M_set_string_error_msg);
		}
	}

	if ((i = strlen(s_in)) > (M_lbuf - 4))
	{
		M_lbuf = i + 32;
		if ((vp = MAPM_REALLOC(M_buf, M_lbuf)) == NULL)
		{
			/* fatal, this does not return */

			M_apm_log_error_msg(M_APM_FATAL, M_set_string_error_msg);
		}

		M_buf = (char *)vp;
	}

	s = M_buf;
	strcpy(s, s_in);

	/* default == zero ... */

	M_set_to_zero(ctmp);

	p = s;

	while (TRUE)
	{
		if (*p == ' ' || *p == '\t')
			p++;
		else
			break;
	}

	if (*p == '\0')
		return;

	sign = 1;             /* assume number is positive */

	if (*p == '+')        /* scan by optional '+' sign */
		p++;
	else
	{
		if (*p == '-')     /* check if number negative */
		{
			sign = -1;
			p++;
		}
	}

	M_lowercase(p);       /* convert string to lowercase */
	exponent = 0;         /* default */

	if ((cp = strstr(p, "e")) != NULL)
	{
		exponent = atoi(cp + sizeof(char));
		*cp = '\0';          /* erase the exponent now */
	}

	j = M_strposition(p, (char *) ".");        /* is there a decimal point ?? */
	if (j == -1)
	{
		strcat(p, ".");               /* if not, append one */
		j = M_strposition(p, (char *) ".");     /* now find it ... */
	}

	if (j > 0)                       /* normalize number and adjust exponent */
	{
		exponent += j;
		memmove((p + 1), p, (j * sizeof(char)));
	}

	p++;        /* scan past implied decimal point now in column 1 (index 0) */

	i = strlen(p);
	ctmp->m_apm_datalength = i;

	if ((i & 1) != 0)   /* if odd number of digits, append a '0' to make it even */
		strcat(p, "0");

	j = strlen(p) >> 1;  /* number of bytes in encoded M_APM number */

	/* do we need more memory to hold this number */

	if (j > ctmp->m_apm_malloclength)
	{
		if ((vp = MAPM_REALLOC(ctmp->m_apm_data, (j + 32))) == NULL)
		{
			/* fatal, this does not return */

			M_apm_log_error_msg(M_APM_FATAL, M_set_string_error_msg);
		}

		ctmp->m_apm_malloclength = j + 28;
		ctmp->m_apm_data = (UCHAR *)vp;
	}

	zflag = TRUE;

	for (i = 0; i < j; i++)
	{
		ch = *p++ - '0';
		if ((ch = (10 * ch + *p++ - '0')) != 0)
			zflag = FALSE;

		if (((int)ch & 0xFF) >= 100)
		{
			M_apm_log_error_msg(M_APM_RETURN,
			                    "\'m_apm_set_string\', Non-digit char found in parse");

			M_apm_log_error_msg(M_APM_RETURN, "Text =");
			M_apm_log_error_msg(M_APM_RETURN, s_in);

			M_set_to_zero(ctmp);
			return;
		}

		ctmp->m_apm_data[i]   = ch;
		ctmp->m_apm_data[i + 1] = 0;
	}

	ctmp->m_apm_exponent = exponent;
	ctmp->m_apm_sign     = sign;

	if (zflag)
	{
		ctmp->m_apm_exponent   = 0;
		ctmp->m_apm_sign       = 0;
		ctmp->m_apm_datalength = 1;
	}
	else
	{
		M_apm_normalize(ctmp);
	}

	/*
	 *  if our local temp string is getting too big,
	 *  release it's memory and start over next time.
	 *  (this 1000 byte threshold is quite arbitrary,
	 *  it may be more efficient in your app to make
	 *  this number bigger).
	 */

	if (M_lbuf > 1000)
	{
		MAPM_FREE(M_buf);
		M_buf  = NULL;
		M_lbuf = 0;
	}
}
/****************************************************************************/
void	m_apm_to_string(char *s, int places, M_APM mtmp)
{
	M_APM   ctmp;
	char	*cp;
	int	i, index, first, max_i, num_digits, dec_places;
	UCHAR	numdiv, numrem;

	ctmp = M_get_stack_var();
	dec_places = places;

	if (dec_places < 0)
		m_apm_copy(ctmp, mtmp);
	else
		m_apm_round(ctmp, dec_places, mtmp);

	if (ctmp->m_apm_sign == 0)
	{
		if (dec_places < 0)
			strcpy(s, "0.0E+0");
		else
		{
			strcpy(s, "0");

			if (dec_places > 0)
				strcat(s, ".");

			for (i = 0; i < dec_places; i++)
				strcat(s, "0");

			strcat(s, "E+0");
		}

		M_restore_stack(1);
		return;
	}

	max_i = (ctmp->m_apm_datalength + 1) >> 1;

	if (dec_places < 0)
		num_digits = ctmp->m_apm_datalength;
	else
		num_digits = dec_places + 1;

	cp = s;

	if (ctmp->m_apm_sign == -1)
		*cp++ = '-';

	first = TRUE;

	i = 0;
	index = 0;

	while (TRUE)
	{
		if (index >= max_i)
		{
			numdiv = 0;
			numrem = 0;
		}
		else
			M_get_div_rem_10((int)ctmp->m_apm_data[index], &numdiv, &numrem);

		index++;

		*cp++ = numdiv + '0';

		if (++i == num_digits)
			break;

		if (first)
		{
			first = FALSE;
			*cp++ = '.';
		}

		*cp++ = numrem + '0';

		if (++i == num_digits)
			break;
	}

	i = ctmp->m_apm_exponent - 1;
	if (i >= 0)
		sprintf(cp, "E+%d", i);
	else
		sprintf(cp, "E%d", i);

	M_restore_stack(1);
}
/****************************************************************************/