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[pgsql.git] / src / backend / utils / adt / int8.c

/*-------------------------------------------------------------------------
 *
 * int8.c
 *        Internal 64-bit integer operations
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *        src/backend/utils/adt/int8.c
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

#include <ctype.h>
#include <limits.h>
#include <math.h>

#include "common/int.h"
#include "funcapi.h"
#include "libpq/pqformat.h"
#include "nodes/nodeFuncs.h"
#include "nodes/supportnodes.h"
#include "optimizer/optimizer.h"
#include "utils/builtins.h"


typedef struct
{
        int64           current;
        int64           finish;
        int64           step;
} generate_series_fctx;


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

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

/* int8in()
 */
Datum
int8in(PG_FUNCTION_ARGS)
{
        char       *num = PG_GETARG_CSTRING(0);

        PG_RETURN_INT64(pg_strtoint64_safe(num, fcinfo->context));
}


/* int8out()
 */
Datum
int8out(PG_FUNCTION_ARGS)
{
        int64           val = PG_GETARG_INT64(0);
        char            buf[MAXINT8LEN + 1];
        char       *result;
        int                     len;

        len = pg_lltoa(val, buf) + 1;

        /*
         * Since the length is already known, we do a manual palloc() and memcpy()
         * to avoid the strlen() call that would otherwise be done in pstrdup().
         */
        result = palloc(len);
        memcpy(result, buf, len);
        PG_RETURN_CSTRING(result);
}

/*
 *              int8recv                        - converts external binary format to int8
 */
Datum
int8recv(PG_FUNCTION_ARGS)
{
        StringInfo      buf = (StringInfo) PG_GETARG_POINTER(0);

        PG_RETURN_INT64(pq_getmsgint64(buf));
}

/*
 *              int8send                        - converts int8 to binary format
 */
Datum
int8send(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        StringInfoData buf;

        pq_begintypsend(&buf);
        pq_sendint64(&buf, arg1);
        PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}


/*----------------------------------------------------------
 *      Relational operators for int8s, including cross-data-type comparisons.
 *---------------------------------------------------------*/

/* int8relop()
 * Is val1 relop val2?
 */
Datum
int8eq(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 == val2);
}

Datum
int8ne(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 != val2);
}

Datum
int8lt(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 < val2);
}

Datum
int8gt(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 > val2);
}

Datum
int8le(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 <= val2);
}

Datum
int8ge(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 >= val2);
}

/* int84relop()
 * Is 64-bit val1 relop 32-bit val2?
 */
Datum
int84eq(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int32           val2 = PG_GETARG_INT32(1);

        PG_RETURN_BOOL(val1 == val2);
}

Datum
int84ne(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int32           val2 = PG_GETARG_INT32(1);

        PG_RETURN_BOOL(val1 != val2);
}

Datum
int84lt(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int32           val2 = PG_GETARG_INT32(1);

        PG_RETURN_BOOL(val1 < val2);
}

Datum
int84gt(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int32           val2 = PG_GETARG_INT32(1);

        PG_RETURN_BOOL(val1 > val2);
}

Datum
int84le(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int32           val2 = PG_GETARG_INT32(1);

        PG_RETURN_BOOL(val1 <= val2);
}

Datum
int84ge(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int32           val2 = PG_GETARG_INT32(1);

        PG_RETURN_BOOL(val1 >= val2);
}

/* int48relop()
 * Is 32-bit val1 relop 64-bit val2?
 */
Datum
int48eq(PG_FUNCTION_ARGS)
{
        int32           val1 = PG_GETARG_INT32(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 == val2);
}

Datum
int48ne(PG_FUNCTION_ARGS)
{
        int32           val1 = PG_GETARG_INT32(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 != val2);
}

Datum
int48lt(PG_FUNCTION_ARGS)
{
        int32           val1 = PG_GETARG_INT32(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 < val2);
}

Datum
int48gt(PG_FUNCTION_ARGS)
{
        int32           val1 = PG_GETARG_INT32(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 > val2);
}

Datum
int48le(PG_FUNCTION_ARGS)
{
        int32           val1 = PG_GETARG_INT32(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 <= val2);
}

Datum
int48ge(PG_FUNCTION_ARGS)
{
        int32           val1 = PG_GETARG_INT32(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 >= val2);
}

/* int82relop()
 * Is 64-bit val1 relop 16-bit val2?
 */
Datum
int82eq(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int16           val2 = PG_GETARG_INT16(1);

        PG_RETURN_BOOL(val1 == val2);
}

Datum
int82ne(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int16           val2 = PG_GETARG_INT16(1);

        PG_RETURN_BOOL(val1 != val2);
}

Datum
int82lt(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int16           val2 = PG_GETARG_INT16(1);

        PG_RETURN_BOOL(val1 < val2);
}

Datum
int82gt(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int16           val2 = PG_GETARG_INT16(1);

        PG_RETURN_BOOL(val1 > val2);
}

Datum
int82le(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int16           val2 = PG_GETARG_INT16(1);

        PG_RETURN_BOOL(val1 <= val2);
}

Datum
int82ge(PG_FUNCTION_ARGS)
{
        int64           val1 = PG_GETARG_INT64(0);
        int16           val2 = PG_GETARG_INT16(1);

        PG_RETURN_BOOL(val1 >= val2);
}

/* int28relop()
 * Is 16-bit val1 relop 64-bit val2?
 */
Datum
int28eq(PG_FUNCTION_ARGS)
{
        int16           val1 = PG_GETARG_INT16(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 == val2);
}

Datum
int28ne(PG_FUNCTION_ARGS)
{
        int16           val1 = PG_GETARG_INT16(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 != val2);
}

Datum
int28lt(PG_FUNCTION_ARGS)
{
        int16           val1 = PG_GETARG_INT16(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 < val2);
}

Datum
int28gt(PG_FUNCTION_ARGS)
{
        int16           val1 = PG_GETARG_INT16(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 > val2);
}

Datum
int28le(PG_FUNCTION_ARGS)
{
        int16           val1 = PG_GETARG_INT16(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 <= val2);
}

Datum
int28ge(PG_FUNCTION_ARGS)
{
        int16           val1 = PG_GETARG_INT16(0);
        int64           val2 = PG_GETARG_INT64(1);

        PG_RETURN_BOOL(val1 >= val2);
}

/*
 * in_range support function for int8.
 *
 * Note: we needn't supply int8_int4 or int8_int2 variants, as implicit
 * coercion of the offset value takes care of those scenarios just as well.
 */
Datum
in_range_int8_int8(PG_FUNCTION_ARGS)
{
        int64           val = PG_GETARG_INT64(0);
        int64           base = PG_GETARG_INT64(1);
        int64           offset = PG_GETARG_INT64(2);
        bool            sub = PG_GETARG_BOOL(3);
        bool            less = PG_GETARG_BOOL(4);
        int64           sum;

        if (offset < 0)
                ereport(ERROR,
                                (errcode(ERRCODE_INVALID_PRECEDING_OR_FOLLOWING_SIZE),
                                 errmsg("invalid preceding or following size in window function")));

        if (sub)
                offset = -offset;               /* cannot overflow */

        if (unlikely(pg_add_s64_overflow(base, offset, &sum)))
        {
                /*
                 * If sub is false, the true sum is surely more than val, so correct
                 * answer is the same as "less".  If sub is true, the true sum is
                 * surely less than val, so the answer is "!less".
                 */
                PG_RETURN_BOOL(sub ? !less : less);
        }

        if (less)
                PG_RETURN_BOOL(val <= sum);
        else
                PG_RETURN_BOOL(val >= sum);
}


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

Datum
int8um(PG_FUNCTION_ARGS)
{
        int64           arg = PG_GETARG_INT64(0);
        int64           result;

        if (unlikely(arg == PG_INT64_MIN))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        result = -arg;
        PG_RETURN_INT64(result);
}

Datum
int8up(PG_FUNCTION_ARGS)
{
        int64           arg = PG_GETARG_INT64(0);

        PG_RETURN_INT64(arg);
}

Datum
int8pl(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        if (unlikely(pg_add_s64_overflow(arg1, arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int8mi(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        if (unlikely(pg_sub_s64_overflow(arg1, arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int8mul(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        if (unlikely(pg_mul_s64_overflow(arg1, arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int8div(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        if (arg2 == 0)
        {
                ereport(ERROR,
                                (errcode(ERRCODE_DIVISION_BY_ZERO),
                                 errmsg("division by zero")));
                /* ensure compiler realizes we mustn't reach the division (gcc bug) */
                PG_RETURN_NULL();
        }

        /*
         * INT64_MIN / -1 is problematic, since the result can't be represented on
         * a two's-complement machine.  Some machines produce INT64_MIN, some
         * produce zero, some throw an exception.  We can dodge the problem by
         * recognizing that division by -1 is the same as negation.
         */
        if (arg2 == -1)
        {
                if (unlikely(arg1 == PG_INT64_MIN))
                        ereport(ERROR,
                                        (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                         errmsg("bigint out of range")));
                result = -arg1;
                PG_RETURN_INT64(result);
        }

        /* No overflow is possible */

        result = arg1 / arg2;

        PG_RETURN_INT64(result);
}

/* int8abs()
 * Absolute value
 */
Datum
int8abs(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           result;

        if (unlikely(arg1 == PG_INT64_MIN))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        result = (arg1 < 0) ? -arg1 : arg1;
        PG_RETURN_INT64(result);
}

/* int8mod()
 * Modulo operation.
 */
Datum
int8mod(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           arg2 = PG_GETARG_INT64(1);

        if (unlikely(arg2 == 0))
        {
                ereport(ERROR,
                                (errcode(ERRCODE_DIVISION_BY_ZERO),
                                 errmsg("division by zero")));
                /* ensure compiler realizes we mustn't reach the division (gcc bug) */
                PG_RETURN_NULL();
        }

        /*
         * Some machines throw a floating-point exception for INT64_MIN % -1,
         * which is a bit silly since the correct answer is perfectly
         * well-defined, namely zero.
         */
        if (arg2 == -1)
                PG_RETURN_INT64(0);

        /* No overflow is possible */

        PG_RETURN_INT64(arg1 % arg2);
}

/*
 * Greatest Common Divisor
 *
 * Returns the largest positive integer that exactly divides both inputs.
 * Special cases:
 *   - gcd(x, 0) = gcd(0, x) = abs(x)
 *              because 0 is divisible by anything
 *   - gcd(0, 0) = 0
 *              complies with the previous definition and is a common convention
 *
 * Special care must be taken if either input is INT64_MIN ---
 * gcd(0, INT64_MIN), gcd(INT64_MIN, 0) and gcd(INT64_MIN, INT64_MIN) are
 * all equal to abs(INT64_MIN), which cannot be represented as a 64-bit signed
 * integer.
 */
static int64
int8gcd_internal(int64 arg1, int64 arg2)
{
        int64           swap;
        int64           a1,
                                a2;

        /*
         * Put the greater absolute value in arg1.
         *
         * This would happen automatically in the loop below, but avoids an
         * expensive modulo operation, and simplifies the special-case handling
         * for INT64_MIN below.
         *
         * We do this in negative space in order to handle INT64_MIN.
         */
        a1 = (arg1 < 0) ? arg1 : -arg1;
        a2 = (arg2 < 0) ? arg2 : -arg2;
        if (a1 > a2)
        {
                swap = arg1;
                arg1 = arg2;
                arg2 = swap;
        }

        /* Special care needs to be taken with INT64_MIN.  See comments above. */
        if (arg1 == PG_INT64_MIN)
        {
                if (arg2 == 0 || arg2 == PG_INT64_MIN)
                        ereport(ERROR,
                                        (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                         errmsg("bigint out of range")));

                /*
                 * Some machines throw a floating-point exception for INT64_MIN % -1,
                 * which is a bit silly since the correct answer is perfectly
                 * well-defined, namely zero.  Guard against this and just return the
                 * result, gcd(INT64_MIN, -1) = 1.
                 */
                if (arg2 == -1)
                        return 1;
        }

        /* Use the Euclidean algorithm to find the GCD */
        while (arg2 != 0)
        {
                swap = arg2;
                arg2 = arg1 % arg2;
                arg1 = swap;
        }

        /*
         * Make sure the result is positive. (We know we don't have INT64_MIN
         * anymore).
         */
        if (arg1 < 0)
                arg1 = -arg1;

        return arg1;
}

Datum
int8gcd(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        result = int8gcd_internal(arg1, arg2);

        PG_RETURN_INT64(result);
}

/*
 * Least Common Multiple
 */
Datum
int8lcm(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           gcd;
        int64           result;

        /*
         * Handle lcm(x, 0) = lcm(0, x) = 0 as a special case.  This prevents a
         * division-by-zero error below when x is zero, and an overflow error from
         * the GCD computation when x = INT64_MIN.
         */
        if (arg1 == 0 || arg2 == 0)
                PG_RETURN_INT64(0);

        /* lcm(x, y) = abs(x / gcd(x, y) * y) */
        gcd = int8gcd_internal(arg1, arg2);
        arg1 = arg1 / gcd;

        if (unlikely(pg_mul_s64_overflow(arg1, arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));

        /* If the result is INT64_MIN, it cannot be represented. */
        if (unlikely(result == PG_INT64_MIN))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));

        if (result < 0)
                result = -result;

        PG_RETURN_INT64(result);
}

Datum
int8inc(PG_FUNCTION_ARGS)
{
        /*
         * When int8 is pass-by-reference, we provide this special case to avoid
         * palloc overhead for COUNT(): when called as an aggregate, we know that
         * the argument is modifiable local storage, so just update it in-place.
         * (If int8 is pass-by-value, then of course this is useless as well as
         * incorrect, so just ifdef it out.)
         */
#ifndef USE_FLOAT8_BYVAL                /* controls int8 too */
        if (AggCheckCallContext(fcinfo, NULL))
        {
                int64      *arg = (int64 *) PG_GETARG_POINTER(0);

                if (unlikely(pg_add_s64_overflow(*arg, 1, arg)))
                        ereport(ERROR,
                                        (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                         errmsg("bigint out of range")));

                PG_RETURN_POINTER(arg);
        }
        else
#endif
        {
                /* Not called as an aggregate, so just do it the dumb way */
                int64           arg = PG_GETARG_INT64(0);
                int64           result;

                if (unlikely(pg_add_s64_overflow(arg, 1, &result)))
                        ereport(ERROR,
                                        (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                         errmsg("bigint out of range")));

                PG_RETURN_INT64(result);
        }
}

Datum
int8dec(PG_FUNCTION_ARGS)
{
        /*
         * When int8 is pass-by-reference, we provide this special case to avoid
         * palloc overhead for COUNT(): when called as an aggregate, we know that
         * the argument is modifiable local storage, so just update it in-place.
         * (If int8 is pass-by-value, then of course this is useless as well as
         * incorrect, so just ifdef it out.)
         */
#ifndef USE_FLOAT8_BYVAL                /* controls int8 too */
        if (AggCheckCallContext(fcinfo, NULL))
        {
                int64      *arg = (int64 *) PG_GETARG_POINTER(0);

                if (unlikely(pg_sub_s64_overflow(*arg, 1, arg)))
                        ereport(ERROR,
                                        (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                         errmsg("bigint out of range")));
                PG_RETURN_POINTER(arg);
        }
        else
#endif
        {
                /* Not called as an aggregate, so just do it the dumb way */
                int64           arg = PG_GETARG_INT64(0);
                int64           result;

                if (unlikely(pg_sub_s64_overflow(arg, 1, &result)))
                        ereport(ERROR,
                                        (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                         errmsg("bigint out of range")));

                PG_RETURN_INT64(result);
        }
}


/*
 * These functions are exactly like int8inc/int8dec but are used for
 * aggregates that count only non-null values.  Since the functions are
 * declared strict, the null checks happen before we ever get here, and all we
 * need do is increment the state value.  We could actually make these pg_proc
 * entries point right at int8inc/int8dec, but then the opr_sanity regression
 * test would complain about mismatched entries for a built-in function.
 */

Datum
int8inc_any(PG_FUNCTION_ARGS)
{
        return int8inc(fcinfo);
}

Datum
int8inc_float8_float8(PG_FUNCTION_ARGS)
{
        return int8inc(fcinfo);
}

Datum
int8dec_any(PG_FUNCTION_ARGS)
{
        return int8dec(fcinfo);
}

/*
 * int8inc_support
 *              prosupport function for int8inc() and int8inc_any()
 */
Datum
int8inc_support(PG_FUNCTION_ARGS)
{
        Node       *rawreq = (Node *) PG_GETARG_POINTER(0);

        if (IsA(rawreq, SupportRequestWFuncMonotonic))
        {
                SupportRequestWFuncMonotonic *req = (SupportRequestWFuncMonotonic *) rawreq;
                MonotonicFunction monotonic = MONOTONICFUNC_NONE;
                int                     frameOptions = req->window_clause->frameOptions;

                /* No ORDER BY clause then all rows are peers */
                if (req->window_clause->orderClause == NIL)
                        monotonic = MONOTONICFUNC_BOTH;
                else
                {
                        /*
                         * Otherwise take into account the frame options.  When the frame
                         * bound is the start of the window then the resulting value can
                         * never decrease, therefore is monotonically increasing
                         */
                        if (frameOptions & FRAMEOPTION_START_UNBOUNDED_PRECEDING)
                                monotonic |= MONOTONICFUNC_INCREASING;

                        /*
                         * Likewise, if the frame bound is the end of the window then the
                         * resulting value can never decrease.
                         */
                        if (frameOptions & FRAMEOPTION_END_UNBOUNDED_FOLLOWING)
                                monotonic |= MONOTONICFUNC_DECREASING;
                }

                req->monotonic = monotonic;
                PG_RETURN_POINTER(req);
        }

        PG_RETURN_POINTER(NULL);
}


Datum
int8larger(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        result = ((arg1 > arg2) ? arg1 : arg2);

        PG_RETURN_INT64(result);
}

Datum
int8smaller(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        result = ((arg1 < arg2) ? arg1 : arg2);

        PG_RETURN_INT64(result);
}

Datum
int84pl(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int32           arg2 = PG_GETARG_INT32(1);
        int64           result;

        if (unlikely(pg_add_s64_overflow(arg1, (int64) arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int84mi(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int32           arg2 = PG_GETARG_INT32(1);
        int64           result;

        if (unlikely(pg_sub_s64_overflow(arg1, (int64) arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int84mul(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int32           arg2 = PG_GETARG_INT32(1);
        int64           result;

        if (unlikely(pg_mul_s64_overflow(arg1, (int64) arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int84div(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int32           arg2 = PG_GETARG_INT32(1);
        int64           result;

        if (arg2 == 0)
        {
                ereport(ERROR,
                                (errcode(ERRCODE_DIVISION_BY_ZERO),
                                 errmsg("division by zero")));
                /* ensure compiler realizes we mustn't reach the division (gcc bug) */
                PG_RETURN_NULL();
        }

        /*
         * INT64_MIN / -1 is problematic, since the result can't be represented on
         * a two's-complement machine.  Some machines produce INT64_MIN, some
         * produce zero, some throw an exception.  We can dodge the problem by
         * recognizing that division by -1 is the same as negation.
         */
        if (arg2 == -1)
        {
                if (unlikely(arg1 == PG_INT64_MIN))
                        ereport(ERROR,
                                        (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                         errmsg("bigint out of range")));
                result = -arg1;
                PG_RETURN_INT64(result);
        }

        /* No overflow is possible */

        result = arg1 / arg2;

        PG_RETURN_INT64(result);
}

Datum
int48pl(PG_FUNCTION_ARGS)
{
        int32           arg1 = PG_GETARG_INT32(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        if (unlikely(pg_add_s64_overflow((int64) arg1, arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int48mi(PG_FUNCTION_ARGS)
{
        int32           arg1 = PG_GETARG_INT32(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        if (unlikely(pg_sub_s64_overflow((int64) arg1, arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int48mul(PG_FUNCTION_ARGS)
{
        int32           arg1 = PG_GETARG_INT32(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        if (unlikely(pg_mul_s64_overflow((int64) arg1, arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int48div(PG_FUNCTION_ARGS)
{
        int32           arg1 = PG_GETARG_INT32(0);
        int64           arg2 = PG_GETARG_INT64(1);

        if (unlikely(arg2 == 0))
        {
                ereport(ERROR,
                                (errcode(ERRCODE_DIVISION_BY_ZERO),
                                 errmsg("division by zero")));
                /* ensure compiler realizes we mustn't reach the division (gcc bug) */
                PG_RETURN_NULL();
        }

        /* No overflow is possible */
        PG_RETURN_INT64((int64) arg1 / arg2);
}

Datum
int82pl(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int16           arg2 = PG_GETARG_INT16(1);
        int64           result;

        if (unlikely(pg_add_s64_overflow(arg1, (int64) arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int82mi(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int16           arg2 = PG_GETARG_INT16(1);
        int64           result;

        if (unlikely(pg_sub_s64_overflow(arg1, (int64) arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int82mul(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int16           arg2 = PG_GETARG_INT16(1);
        int64           result;

        if (unlikely(pg_mul_s64_overflow(arg1, (int64) arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int82div(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int16           arg2 = PG_GETARG_INT16(1);
        int64           result;

        if (unlikely(arg2 == 0))
        {
                ereport(ERROR,
                                (errcode(ERRCODE_DIVISION_BY_ZERO),
                                 errmsg("division by zero")));
                /* ensure compiler realizes we mustn't reach the division (gcc bug) */
                PG_RETURN_NULL();
        }

        /*
         * INT64_MIN / -1 is problematic, since the result can't be represented on
         * a two's-complement machine.  Some machines produce INT64_MIN, some
         * produce zero, some throw an exception.  We can dodge the problem by
         * recognizing that division by -1 is the same as negation.
         */
        if (arg2 == -1)
        {
                if (unlikely(arg1 == PG_INT64_MIN))
                        ereport(ERROR,
                                        (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                         errmsg("bigint out of range")));
                result = -arg1;
                PG_RETURN_INT64(result);
        }

        /* No overflow is possible */

        result = arg1 / arg2;

        PG_RETURN_INT64(result);
}

Datum
int28pl(PG_FUNCTION_ARGS)
{
        int16           arg1 = PG_GETARG_INT16(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        if (unlikely(pg_add_s64_overflow((int64) arg1, arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int28mi(PG_FUNCTION_ARGS)
{
        int16           arg1 = PG_GETARG_INT16(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        if (unlikely(pg_sub_s64_overflow((int64) arg1, arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int28mul(PG_FUNCTION_ARGS)
{
        int16           arg1 = PG_GETARG_INT16(0);
        int64           arg2 = PG_GETARG_INT64(1);
        int64           result;

        if (unlikely(pg_mul_s64_overflow((int64) arg1, arg2, &result)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));
        PG_RETURN_INT64(result);
}

Datum
int28div(PG_FUNCTION_ARGS)
{
        int16           arg1 = PG_GETARG_INT16(0);
        int64           arg2 = PG_GETARG_INT64(1);

        if (unlikely(arg2 == 0))
        {
                ereport(ERROR,
                                (errcode(ERRCODE_DIVISION_BY_ZERO),
                                 errmsg("division by zero")));
                /* ensure compiler realizes we mustn't reach the division (gcc bug) */
                PG_RETURN_NULL();
        }

        /* No overflow is possible */
        PG_RETURN_INT64((int64) arg1 / arg2);
}

/* Binary arithmetics
 *
 *              int8and         - returns arg1 & arg2
 *              int8or          - returns arg1 | arg2
 *              int8xor         - returns arg1 # arg2
 *              int8not         - returns ~arg1
 *              int8shl         - returns arg1 << arg2
 *              int8shr         - returns arg1 >> arg2
 */

Datum
int8and(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           arg2 = PG_GETARG_INT64(1);

        PG_RETURN_INT64(arg1 & arg2);
}

Datum
int8or(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           arg2 = PG_GETARG_INT64(1);

        PG_RETURN_INT64(arg1 | arg2);
}

Datum
int8xor(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int64           arg2 = PG_GETARG_INT64(1);

        PG_RETURN_INT64(arg1 ^ arg2);
}

Datum
int8not(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);

        PG_RETURN_INT64(~arg1);
}

Datum
int8shl(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int32           arg2 = PG_GETARG_INT32(1);

        PG_RETURN_INT64(arg1 << arg2);
}

Datum
int8shr(PG_FUNCTION_ARGS)
{
        int64           arg1 = PG_GETARG_INT64(0);
        int32           arg2 = PG_GETARG_INT32(1);

        PG_RETURN_INT64(arg1 >> arg2);
}

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

Datum
int48(PG_FUNCTION_ARGS)
{
        int32           arg = PG_GETARG_INT32(0);

        PG_RETURN_INT64((int64) arg);
}

Datum
int84(PG_FUNCTION_ARGS)
{
        int64           arg = PG_GETARG_INT64(0);

        if (unlikely(arg < PG_INT32_MIN) || unlikely(arg > PG_INT32_MAX))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("integer out of range")));

        PG_RETURN_INT32((int32) arg);
}

Datum
int28(PG_FUNCTION_ARGS)
{
        int16           arg = PG_GETARG_INT16(0);

        PG_RETURN_INT64((int64) arg);
}

Datum
int82(PG_FUNCTION_ARGS)
{
        int64           arg = PG_GETARG_INT64(0);

        if (unlikely(arg < PG_INT16_MIN) || unlikely(arg > PG_INT16_MAX))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("smallint out of range")));

        PG_RETURN_INT16((int16) arg);
}

Datum
i8tod(PG_FUNCTION_ARGS)
{
        int64           arg = PG_GETARG_INT64(0);
        float8          result;

        result = arg;

        PG_RETURN_FLOAT8(result);
}

/* dtoi8()
 * Convert float8 to 8-byte integer.
 */
Datum
dtoi8(PG_FUNCTION_ARGS)
{
        float8          num = PG_GETARG_FLOAT8(0);

        /*
         * Get rid of any fractional part in the input.  This is so we don't fail
         * on just-out-of-range values that would round into range.  Note
         * assumption that rint() will pass through a NaN or Inf unchanged.
         */
        num = rint(num);

        /* Range check */
        if (unlikely(isnan(num) || !FLOAT8_FITS_IN_INT64(num)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));

        PG_RETURN_INT64((int64) num);
}

Datum
i8tof(PG_FUNCTION_ARGS)
{
        int64           arg = PG_GETARG_INT64(0);
        float4          result;

        result = arg;

        PG_RETURN_FLOAT4(result);
}

/* ftoi8()
 * Convert float4 to 8-byte integer.
 */
Datum
ftoi8(PG_FUNCTION_ARGS)
{
        float4          num = PG_GETARG_FLOAT4(0);

        /*
         * Get rid of any fractional part in the input.  This is so we don't fail
         * on just-out-of-range values that would round into range.  Note
         * assumption that rint() will pass through a NaN or Inf unchanged.
         */
        num = rint(num);

        /* Range check */
        if (unlikely(isnan(num) || !FLOAT4_FITS_IN_INT64(num)))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("bigint out of range")));

        PG_RETURN_INT64((int64) num);
}

Datum
i8tooid(PG_FUNCTION_ARGS)
{
        int64           arg = PG_GETARG_INT64(0);

        if (unlikely(arg < 0) || unlikely(arg > PG_UINT32_MAX))
                ereport(ERROR,
                                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                                 errmsg("OID out of range")));

        PG_RETURN_OID((Oid) arg);
}

Datum
oidtoi8(PG_FUNCTION_ARGS)
{
        Oid                     arg = PG_GETARG_OID(0);

        PG_RETURN_INT64((int64) arg);
}

/*
 * non-persistent numeric series generator
 */
Datum
generate_series_int8(PG_FUNCTION_ARGS)
{
        return generate_series_step_int8(fcinfo);
}

Datum
generate_series_step_int8(PG_FUNCTION_ARGS)
{
        FuncCallContext *funcctx;
        generate_series_fctx *fctx;
        int64           result;
        MemoryContext oldcontext;

        /* stuff done only on the first call of the function */
        if (SRF_IS_FIRSTCALL())
        {
                int64           start = PG_GETARG_INT64(0);
                int64           finish = PG_GETARG_INT64(1);
                int64           step = 1;

                /* see if we were given an explicit step size */
                if (PG_NARGS() == 3)
                        step = PG_GETARG_INT64(2);
                if (step == 0)
                        ereport(ERROR,
                                        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                                         errmsg("step size cannot equal zero")));

                /* create a function context for cross-call persistence */
                funcctx = SRF_FIRSTCALL_INIT();

                /*
                 * switch to memory context appropriate for multiple function calls
                 */
                oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);

                /* allocate memory for user context */
                fctx = (generate_series_fctx *) palloc(sizeof(generate_series_fctx));

                /*
                 * Use fctx to keep state from call to call. Seed current with the
                 * original start value
                 */
                fctx->current = start;
                fctx->finish = finish;
                fctx->step = step;

                funcctx->user_fctx = fctx;
                MemoryContextSwitchTo(oldcontext);
        }

        /* stuff done on every call of the function */
        funcctx = SRF_PERCALL_SETUP();

        /*
         * get the saved state and use current as the result for this iteration
         */
        fctx = funcctx->user_fctx;
        result = fctx->current;

        if ((fctx->step > 0 && fctx->current <= fctx->finish) ||
                (fctx->step < 0 && fctx->current >= fctx->finish))
        {
                /*
                 * Increment current in preparation for next iteration. If next-value
                 * computation overflows, this is the final result.
                 */
                if (pg_add_s64_overflow(fctx->current, fctx->step, &fctx->current))
                        fctx->step = 0;

                /* do when there is more left to send */
                SRF_RETURN_NEXT(funcctx, Int64GetDatum(result));
        }
        else
                /* do when there is no more left */
                SRF_RETURN_DONE(funcctx);
}

/*
 * Planner support function for generate_series(int8, int8 [, int8])
 */
Datum
generate_series_int8_support(PG_FUNCTION_ARGS)
{
        Node       *rawreq = (Node *) PG_GETARG_POINTER(0);
        Node       *ret = NULL;

        if (IsA(rawreq, SupportRequestRows))
        {
                /* Try to estimate the number of rows returned */
                SupportRequestRows *req = (SupportRequestRows *) rawreq;

                if (is_funcclause(req->node))   /* be paranoid */
                {
                        List       *args = ((FuncExpr *) req->node)->args;
                        Node       *arg1,
                                           *arg2,
                                           *arg3;

                        /* We can use estimated argument values here */
                        arg1 = estimate_expression_value(req->root, linitial(args));
                        arg2 = estimate_expression_value(req->root, lsecond(args));
                        if (list_length(args) >= 3)
                                arg3 = estimate_expression_value(req->root, lthird(args));
                        else
                                arg3 = NULL;

                        /*
                         * If any argument is constant NULL, we can safely assume that
                         * zero rows are returned.  Otherwise, if they're all non-NULL
                         * constants, we can calculate the number of rows that will be
                         * returned.  Use double arithmetic to avoid overflow hazards.
                         */
                        if ((IsA(arg1, Const) &&
                                 ((Const *) arg1)->constisnull) ||
                                (IsA(arg2, Const) &&
                                 ((Const *) arg2)->constisnull) ||
                                (arg3 != NULL && IsA(arg3, Const) &&
                                 ((Const *) arg3)->constisnull))
                        {
                                req->rows = 0;
                                ret = (Node *) req;
                        }
                        else if (IsA(arg1, Const) &&
                                         IsA(arg2, Const) &&
                                         (arg3 == NULL || IsA(arg3, Const)))
                        {
                                double          start,
                                                        finish,
                                                        step;

                                start = DatumGetInt64(((Const *) arg1)->constvalue);
                                finish = DatumGetInt64(((Const *) arg2)->constvalue);
                                step = arg3 ? DatumGetInt64(((Const *) arg3)->constvalue) : 1;

                                /* This equation works for either sign of step */
                                if (step != 0)
                                {
                                        req->rows = floor((finish - start + step) / step);
                                        ret = (Node *) req;
                                }
                        }
                }
        }

        PG_RETURN_POINTER(ret);
}