int8.c

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/*-------------------------------------------------------------------------
 *
 * int8.c
 *	  Internal 64-bit integer operations
 *
 * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *	  $PostgreSQL: pgsql/src/backend/utils/adt/int8.c,v 1.68 2008/01/01 19:45:52 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

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

#include "funcapi.h"
#include "libpq/pqformat.h"
#include "nodes/nodes.h"
#include "utils/int8.h"


#define MAXINT8LEN		25

#define SAMESIGN(a,b)	(((a) < 0) == ((b) < 0))

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


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

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

/*
 * scanint8 --- try to parse a string into an int8.
 *
 * If errorOK is false, ereport a useful error message if the string is bad.
 * If errorOK is true, just return "false" for bad input.
 */
bool
scanint8(const char *str, bool errorOK, int64 *result)
{
	const char *ptr = str;
	int64		tmp = 0;
	int			sign = 1;

	/*
	 * Do our own scan, rather than relying on sscanf which might be broken
	 * for long long.
	 */

	/* skip leading spaces */
	while (*ptr && isspace((unsigned char) *ptr))
		ptr++;

	/* handle sign */
	if (*ptr == '-')
	{
		ptr++;

		/*
		 * Do an explicit check for INT64_MIN.	Ugly though this is, it's
		 * cleaner than trying to get the loop below to handle it portably.
		 */
#ifndef INT64_IS_BUSTED
		if (strncmp(ptr, "9223372036854775808", 19) == 0)
		{
			tmp = -INT64CONST(0x7fffffffffffffff) - 1;
			ptr += 19;
			goto gotdigits;
		}
#endif

		sign = -1;
	}
	else if (*ptr == '+')
		ptr++;

	/* require at least one digit */
	if (!isdigit((unsigned char) *ptr))
	{
		if (errorOK)
			return false;
		else
			ereport(ERROR,
					(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
					 errmsg("invalid input syntax for integer: \"%s\"",
							str)));
	}

	/* process digits */
	while (*ptr && isdigit((unsigned char) *ptr))
	{
		int64		newtmp = tmp * 10 + (*ptr++ - '0');

		if ((newtmp / 10) != tmp)		/* overflow? */
		{
			if (errorOK)
				return false;
			else
				ereport(ERROR,
						(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
					   errmsg("value \"%s\" is out of range for type bigint",
							  str)));
		}
		tmp = newtmp;
	}

gotdigits:

	/* allow trailing whitespace, but not other trailing chars */
	while (*ptr != '\0' && isspace((unsigned char) *ptr))
		ptr++;

	if (*ptr != '\0')
	{
		if (errorOK)
			return false;
		else
			ereport(ERROR,
					(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
					 errmsg("invalid input syntax for integer: \"%s\"",
							str)));
	}

	*result = (sign < 0) ? -tmp : tmp;

	return true;
}

/* int8in()
 */
Datum
int8in(PG_FUNCTION_ARGS)
{
	char	   *str = PG_GETARG_CSTRING(0);
	int64		result;

	(void) scanint8(str, false, &result);
	PG_RETURN_INT64(result);
}


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

	if ((len = snprintf(buf, MAXINT8LEN, INT64_FORMAT, val)) < 0)
		elog(ERROR, "could not format int8");

	result = pstrdup(buf);
	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);
}


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

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

	result = -arg;
	/* overflow check (needed for INT64_MIN) */
	if (arg != 0 && SAMESIGN(result, arg))
		ereport(ERROR,
				(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
				 errmsg("bigint out of range")));
	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;

	result = arg1 + arg2;

	/*
	 * Overflow check.	If the inputs are of different signs then their sum
	 * cannot overflow.  If the inputs are of the same sign, their sum had
	 * better be that sign too.
	 */
	if (SAMESIGN(arg1, arg2) && !SAMESIGN(result, arg1))
		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;

	result = arg1 - arg2;

	/*
	 * Overflow check.	If the inputs are of the same sign then their
	 * difference cannot overflow.	If they are of different signs then the
	 * result should be of the same sign as the first input.
	 */
	if (!SAMESIGN(arg1, arg2) && !SAMESIGN(result, arg1))
		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;

	result = arg1 * arg2;

	/*
	 * Overflow check.	We basically check to see if result / arg2 gives arg1
	 * again.  There are two cases where this fails: arg2 = 0 (which cannot
	 * overflow) and arg1 = INT64_MIN, arg2 = -1 (where the division itself
	 * will overflow and thus incorrectly match).
	 *
	 * Since the division is likely much more expensive than the actual
	 * multiplication, we'd like to skip it where possible.  The best bang for
	 * the buck seems to be to check whether both inputs are in the int32
	 * range; if so, no overflow is possible.  (But that only works if we
	 * really have a 64-bit int64 datatype...)
	 */
#ifndef INT64_IS_BUSTED
	if (arg1 != (int64) ((int32) arg1) || arg2 != (int64) ((int32) arg2))
#endif
	{
		if (arg2 != 0 &&
			(result / arg2 != arg1 || (arg2 == -1 && arg1 < 0 && result < 0)))
			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")));

	result = arg1 / arg2;

	/*
	 * Overflow check.	The only possible overflow case is for arg1 =
	 * INT64_MIN, arg2 = -1, where the correct result is -INT64_MIN, which
	 * can't be represented on a two's-complement machine.