int.c

/*-------------------------------------------------------------------------
 *
 * int.c
 *	  Functions for the built-in integer types (except int8).
 *
 * Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  $PostgreSQL: pgsql/src/backend/utils/adt/int.c,v 1.61 2004/08/29 04:12:51 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
/*
 * OLD COMMENTS
 *		I/O routines:
 *		 int2in, int2out, int2recv, int2send
 *		 int4in, int4out, int4recv, int4send
 *		 int2vectorin, int2vectorout, int2vectorrecv, int2vectorsend
 *		Conversion routines:
 *		 itoi, int2_text, int4_text
 *		Boolean operators:
 *		 inteq, intne, intlt, intle, intgt, intge
 *		Arithmetic operators:
 *		 intpl, intmi, int4mul, intdiv
 *
 *		Arithmetic operators:
 *		 intmod
 */

#include "postgres.h"

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

#include "funcapi.h"
#include "libpq/pqformat.h"
#include "utils/builtins.h"

#ifndef SHRT_MAX
#define SHRT_MAX (0x7FFF)
#endif
#ifndef SHRT_MIN
#define SHRT_MIN (-0x8000)
#endif

typedef struct
{
	int32		current;
	int32		finish;
	int32		step;
}	generate_series_fctx;

/*****************************************************************************
 *	 USER I/O ROUTINES														 *
 *****************************************************************************/

/*
 *		int2in			- converts "num" to short
 */
Datum
int2in(PG_FUNCTION_ARGS)
{
	char	   *num = PG_GETARG_CSTRING(0);

	PG_RETURN_INT16(pg_atoi(num, sizeof(int16), '\0'));
}

/*
 *		int2out			- converts short to "num"
 */
Datum
int2out(PG_FUNCTION_ARGS)
{
	int16		arg1 = PG_GETARG_INT16(0);
	char	   *result = (char *) palloc(7);	/* sign, 5 digits, '\0' */

	pg_itoa(arg1, result);
	PG_RETURN_CSTRING(result);
}

/*
 *		int2recv			- converts external binary format to int2
 */
Datum
int2recv(PG_FUNCTION_ARGS)
{
	StringInfo	buf = (StringInfo) PG_GETARG_POINTER(0);

	PG_RETURN_INT16((int16) pq_getmsgint(buf, sizeof(int16)));
}

/*
 *		int2send			- converts int2 to binary format
 */
Datum
int2send(PG_FUNCTION_ARGS)
{
	int16		arg1 = PG_GETARG_INT16(0);
	StringInfoData buf;

	pq_begintypsend(&buf);
	pq_sendint(&buf, arg1, sizeof(int16));
	PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}

/*
 *		int2vectorin			- converts "num num ..." to internal form
 *
 *		Note: Fills any missing slots with zeroes.
 */
Datum
int2vectorin(PG_FUNCTION_ARGS)
{
	char	   *intString = PG_GETARG_CSTRING(0);
	int16	   *result = (int16 *) palloc(sizeof(int16[INDEX_MAX_KEYS]));
	int			slot;

	for (slot = 0; *intString && slot < INDEX_MAX_KEYS; slot++)
	{
		if (sscanf(intString, "%hd", &result[slot]) != 1)
			break;
		while (*intString && isspace((unsigned char) *intString))
			intString++;
		while (*intString && !isspace((unsigned char) *intString))
			intString++;
	}
	while (*intString && isspace((unsigned char) *intString))
		intString++;
	if (*intString)
		ereport(ERROR,
				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
				 errmsg("int2vector has too many elements")));

	while (slot < INDEX_MAX_KEYS)
		result[slot++] = 0;

	PG_RETURN_POINTER(result);
}

/*
 *		int2vectorout		- converts internal form to "num num ..."
 */
Datum
int2vectorout(PG_FUNCTION_ARGS)
{
	int16	   *int2Array = (int16 *) PG_GETARG_POINTER(0);
	int			num,
				maxnum;
	char	   *rp;
	char	   *result;

	/* find last non-zero value in vector */
	for (maxnum = INDEX_MAX_KEYS - 1; maxnum >= 0; maxnum--)
		if (int2Array[maxnum] != 0)
			break;

	/* assumes sign, 5 digits, ' ' */
	rp = result = (char *) palloc((maxnum + 1) * 7 + 1);
	for (num = 0; num <= maxnum; num++)
	{
		if (num != 0)
			*rp++ = ' ';
		pg_itoa(int2Array[num], rp);
		while (*++rp != '\0')
			;
	}
	*rp = '\0';
	PG_RETURN_CSTRING(result);
}

/*
 *		int2vectorrecv			- converts external binary format to int2vector
 */
Datum
int2vectorrecv(PG_FUNCTION_ARGS)
{
	StringInfo	buf = (StringInfo) PG_GETARG_POINTER(0);
	int16	   *result = (int16 *) palloc(sizeof(int16[INDEX_MAX_KEYS]));
	int			slot;

	for (slot = 0; slot < INDEX_MAX_KEYS; slot++)
		result[slot] = (int16) pq_getmsgint(buf, sizeof(int16));
	PG_RETURN_POINTER(result);
}

/*
 *		int2vectorsend			- converts int2vector to binary format
 */
Datum
int2vectorsend(PG_FUNCTION_ARGS)
{
	int16	   *int2Array = (int16 *) PG_GETARG_POINTER(0);
	StringInfoData buf;
	int			slot;

	pq_begintypsend(&buf);
	for (slot = 0; slot < INDEX_MAX_KEYS; slot++)
		pq_sendint(&buf, int2Array[slot], sizeof(int16));