/*-------------------------------------------------------------------------
 *
 * int8.c--
 *    Internal 64-bit integer operations
 *
 *-------------------------------------------------------------------------
 */
#include <stdio.h>	/* for sprintf proto, etc. */
#include <stdlib.h>	/* for strtod, etc. */
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <math.h>
#include <float.h>
#include <limits.h>

#include "postgres.h"
#include "utils/palloc.h"

#define MAXINT8LEN	25

#define USE_LOCAL_CODE	1

#if defined(__alpha) || defined(__GNUC__)
#define HAVE_64BIT_INTS 1
#endif

#ifndef HAVE_64BIT_INTS
typedef char[8] int64;

#elif defined(__alpha)
typedef long int int64;
#define INT64_FORMAT "%ld"

#elif defined(__GNUC__)
typedef long long int int64;
#define INT64_FORMAT "%Ld"

#else
typedef long int int64;
#define INT64_FORMAT "%ld"
#endif

int64 *int8in(char *str);
char *int8out(int64 *val);

bool int8eq(int64 *val1, int64 *val2);
bool int8ne(int64 *val1, int64 *val2);
bool int8lt(int64 *val1, int64 *val2);
bool int8gt(int64 *val1, int64 *val2);
bool int8le(int64 *val1, int64 *val2);
bool int8ge(int64 *val1, int64 *val2);

bool int84eq(int64 *val1, int32 val2);
bool int84ne(int64 *val1, int32 val2);
bool int84lt(int64 *val1, int32 val2);
bool int84gt(int64 *val1, int32 val2);
bool int84le(int64 *val1, int32 val2);
bool int84ge(int64 *val1, int32 val2);

int64 *int8um(int64 *val);
int64 *int8pl(int64 *val1, int64 *val2);
int64 *int8mi(int64 *val1, int64 *val2);
int64 *int8mul(int64 *val1, int64 *val2);
int64 *int8div(int64 *val1, int64 *val2);

int64 *int48(int32 val);
int32 int84(int64 *val);
#if FALSE
int64 *int28(int16 val);
int16 int82(int64 *val);
#endif

float64 i8tod(int64 *val);
int64 *dtoi8(float64 val);

#if USE_LOCAL_CODE

#ifndef PALLOC
#define PALLOC(p) palloc(p)
#endif

#ifndef PALLOCTYPE
#define PALLOCTYPE(p) palloc(sizeof(p))
#endif

#endif

/***********************************************************************
 **
 ** 	Routines for 64-bit integers.
 **
 ***********************************************************************/

/*----------------------------------------------------------
 * Formatting and conversion routines.
 *---------------------------------------------------------*/

/* int8in()
 */
int64 *int8in(char *str)
{
    int64 *result = PALLOCTYPE(int64);

#if HAVE_64BIT_INTS
    if (!PointerIsValid(str))
	elog (WARN,"Bad (null) int8 external representation",NULL);

    if (sscanf(str, INT64_FORMAT, result) != 1)
	elog(WARN,"Bad int8 external representation '%s'",str);

#else
    elog(WARN,"64-bit integers are not supported",NULL);
    result = NULL;
#endif

    return(result);
} /* int8in() */


/* int8out()
 */
char *int8out(int64 *val)
{
    char *result;

    int len;
    char buf[MAXINT8LEN+1];

#if HAVE_64BIT_INTS
    if (!PointerIsValid(val))
	return(NULL);

    if ((len = snprintf( buf, MAXINT8LEN, INT64_FORMAT, *val)) < 0)
	  elog (WARN,"Unable to format int8",NULL);

    result = PALLOC(len+1);

    strcpy(result, buf);

#else
    elog(WARN,"64-bit integers are not supported",NULL);
    result = NULL;
#endif

    return( result);
} /* int8out() */


/*----------------------------------------------------------
 *  Relational operators for int8s.
 *---------------------------------------------------------*/

/* int8relop()
 * Is val1 relop val2?
 */
bool int8eq(int64 *val1, int64 *val2)
{
    return(*val1 == *val2);
} /* int8eq() */

bool int8ne(int64 *val1, int64 *val2)
{
    return(*val1 != *val2);
} /* int8ne() */

bool int8lt(int64 *val1, int64 *val2)
{
    return(*val1 < *val2);
} /* int8lt() */

bool int8gt(int64 *val1, int64 *val2)
{
    return(*val1 > *val2);
} /* int8gt() */

bool int8le(int64 *val1, int64 *val2)
{
    return(*val1 <= *val2);
} /* int8le() */

bool int8ge(int64 *val1, int64 *val2)
{
    return(*val1 >= *val2);
} /* int8ge() */


/* int84relop()
 * Is 64-bit val1 relop 32-bit val2?
 */
bool int84eq(int64 *val1, int32 val2)
{
    return(*val1 == val2);
} /* int84eq() */

bool int84ne(int64 *val1, int32 val2)
{
    return(*val1 != val2);
} /* int84ne() */

bool int84lt(int64 *val1, int32 val2)
{
    return(*val1 < val2);
} /* int84lt() */

bool int84gt(int64 *val1, int32 val2)
{
    return(*val1 > val2);
} /* int84gt() */

bool int84le(int64 *val1, int32 val2)
{
    return(*val1 <= val2);
} /* int84le() */

bool int84ge(int64 *val1, int32 val2)
{
    return(*val1 >= val2);
} /* int84ge() */


/*----------------------------------------------------------
 *  Arithmetic operators on 64-bit integers.
 *---------------------------------------------------------*/

int64 *int8um(int64 *val)
{
    int64 *result = PALLOCTYPE(int64);

    if (!PointerIsValid(val))
	return NULL;

    *result = (- *val);

    return(result);
} /* int8um() */

int64 *int8pl(int64 *val1, int64 *val2)
{
    int64 *result = PALLOCTYPE(int64);

    if ((!PointerIsValid(val1)) || (!PointerIsValid(val2)))
	return NULL;

    *result = *val1 + *val2;

    return(result);
} /* int8pl() */

int64 *int8mi(int64 *val1, int64 *val2)
{
    int64 *result = PALLOCTYPE(int64);

    if ((!PointerIsValid(val1)) || (!PointerIsValid(val2)))
	return NULL;

    *result = *val1 - *val2;

    return(result);
} /* int8mi() */

int64 *int8mul(int64 *val1, int64 *val2)
{
    int64 *result = PALLOCTYPE(int64);

    if ((!PointerIsValid(val1)) || (!PointerIsValid(val2)))
	return NULL;

    *result = *val1 * *val2;

    return(result);
} /* int8mul() */

int64 *int8div(int64 *val1, int64 *val2)
{
    int64 *result = PALLOCTYPE(int64);

    if ((!PointerIsValid(val1)) || (!PointerIsValid(val2)))
	return NULL;

    *result = *val1 / *val2;

    return(result);
} /* int8div() */


/*----------------------------------------------------------
 *  Conversion operators.
 *---------------------------------------------------------*/

int64 *int48(int32 val)
{
    int64 *result = PALLOCTYPE(int64);

    *result = val;

    return(result);
} /* int48() */

int32 int84(int64 *val)
{
    int32 result;

    if (!PointerIsValid(val))
	elog(WARN,"Invalid (null) int64, can't convert int8 to int4",NULL);

    if ((*val < INT_MIN) || (*val > INT_MAX))
	elog(WARN,"int8 conversion to int4 is out of range",NULL);

    result = *val;

    return(result);
} /* int84() */

#if FALSE
int64 *int28(int16 val)
{
    int64 *result;

    if (!PointerIsValid(result = PALLOCTYPE(int64)))
	elog(WARN,"Memory allocation failed, can't convert int8 to int2",NULL);

    *result = val;

    return(result);
} /* int28() */

int16 int82(int64 *val)
{
    int16 result;

    if (!PointerIsValid(val))
	elog(WARN,"Invalid (null) int8, can't convert to int2",NULL);

    result = *val;

    return(result);
} /* int82() */
#endif

float64 i8tod(int64 *val)
{
    float64 result = PALLOCTYPE(float64data);

    *result = *val;

    return(result);
} /* i8tod() */

int64 *dtoi8(float64 val)
{
    int64 *result = PALLOCTYPE(int64);

    if ((*val < (-pow(2,64)+1)) || (*val > (pow(2,64)-1)))
	elog(WARN,"Floating point conversion to int64 is out of range",NULL);

    *result = *val;

    return(result);
} /* dtoi8() */