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/*
* Copyright (C) 2003 Trevor van Bremen
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1,
* or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; see the file COPYING.LIB. If
* not, write to the Free Software Foundation, Inc., 59 Temple Place,
* Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _VBDECIMAL_H
/* DEFINES */
#define DECSIZE 16
#define DECUNKNOWN -2
#define DECPOSNULL (-1) /* if dec_pos == DECPOSNULL then value is
TRUE NULL (less than anything) */
/** STRUCTURES */
/* the structure of an UNPACKED decimal */
struct decimal {
short dec_exp; /* the exponent */
short dec_pos; /* is the value "positive", flag */
short dec_ndgts; /* the number of valid digits in dec_dgts */
VB_UCHAR dec_dgts[DECSIZE]; /* the digits, base 100 */
};
typedef struct decimal dec_t;
/* PSEUDO FUNCTIONS */
/* declen, sig = # of significant digits, rd # digits to right of decimal,
returns # bytes required to hold such */
#define DECLEN(sig,rd) (((sig) + ((rd)&1) + 3) / 2)
#define DECLENGTH(len) DECLEN(PRECTOT(len), PRECDEC(len))
#define DECPREC(size) ((size - 1) << 9) + 2)
#define PRECTOT(len) (((len) >> 8 ) & 0xff)
#define PRECDEC(len) ((len) & 0xff)
#define PRECMAKE(len,dlen) (((len) << 8 ) + (dlen))
/*
** value of an integer that generates a decimal flagged DECPOSNULL
** an int of 2 bytes produces 0x8000
** an int of 4 bytes produces 0x80000000
*/
#define VAL_DECPOSNULL(type) (((type)1) << ((sizeof (type) * 8) - 1))
/* FUNCTION DECLARATIONS */
extern int deccvasc (VB_CHAR * cp, int ln, dec_t * rp);
extern int dectoasc (dec_t * np, VB_CHAR * cp, int ln, int dg);
extern int deccvint (int i, dec_t * dp);
extern int dectoint (dec_t * dp, int *ip);
extern int deccvlong (long i, dec_t * dp);
extern int dectolong (dec_t * dp, long *ip);
extern int deccvflt (float flt, dec_t * dp);
extern int dectoflt (dec_t * dp, float *fltp);
extern int deccvdbl (double dbl, dec_t * dp);
extern int dectodbl (dec_t * dp, double *dblp);
extern int decadd (dec_t * x, dec_t * y, dec_t * r);
extern int decsub (dec_t * x, dec_t * y, dec_t * r);
extern int decmul (dec_t * x, dec_t * y, dec_t * r);
extern int decdiv (dec_t * x, dec_t * y, dec_t * r);
extern int deccmp (dec_t * x, dec_t * y);
extern void deccopy (dec_t * src, dec_t * dst);
extern VB_CHAR *dececvt (dec_t * np, int dg, int *pt, int *sg);
extern VB_CHAR *decfcvt (dec_t * np, int dg, int *pt, int *sg);
#endif
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