/*-------------------------------------------------------------------------
 *
 * tid.c--
 *    Functions for the built-in type tuple id
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *    $Header: /cvsroot/pgsql/src/backend/utils/adt/tid.c,v 1.2 1996/11/06 06:50:05 scrappy Exp $
 *
 * NOTES
 *    input routine largely stolen from boxin().
 *
 *-------------------------------------------------------------------------
 */
#include <stdio.h>		/* for sprintf() */
#include <string.h>
#include "postgres.h"
#include "storage/bufpage.h"

#include "utils/palloc.h"
#include "utils/builtins.h"	/* where function declarations go */


#define LDELIM		'('
#define RDELIM		')'
#define	DELIM		','
#define NTIDARGS	2

/* ----------------------------------------------------------------
 *	tidin
 * ----------------------------------------------------------------
 */
ItemPointer
tidin(char *str)
{
    char		*p, *coord[NTIDARGS];
    int			i;
    ItemPointer		result;
    
    BlockNumber  	blockNumber;
    OffsetNumber	offsetNumber;
    
    if (str == NULL)
	return NULL;
    
    for (i = 0, p = str; *p && i < NTIDARGS && *p != RDELIM; p++)
	if (*p == DELIM || (*p == LDELIM && !i))
	    coord[i++] = p + 1;
    
    if (i < NTIDARGS - 1)
	return NULL;
    
    blockNumber =	(BlockNumber) 	atoi(coord[0]);
    offsetNumber = 	(OffsetNumber)	atoi(coord[1]);
    
    result = (ItemPointer) palloc(sizeof(ItemPointerData));
    
    ItemPointerSet(result, blockNumber, offsetNumber);
    
    return result;
}

/* ----------------------------------------------------------------
 *	tidout
 * ----------------------------------------------------------------
 */
char *
tidout(ItemPointer itemPtr)
{
    BlockNumber  	blockNumber;
    OffsetNumber	offsetNumber;
    BlockId	 	blockId;
    char		buf[32];
    char		*str;
    
    blockId =	 &(itemPtr->ip_blkid);
    
    blockNumber =  BlockIdGetBlockNumber(blockId);
    offsetNumber = itemPtr->ip_posid;
    
    sprintf(buf, "(%d,%d)", blockNumber, offsetNumber);
    
    str = (char *) palloc(strlen(buf)+1);
    strcpy(str, buf);
    
    return str;
}
