granicus.if.org Git - postgresql/blob - src/backend/utils/adt/tid.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * tid.c
   4  *        Functions for the built-in type tuple id
   5  *
   6  * Copyright (c) 1994, Regents of the University of California
   7  *
   8  *
   9  * IDENTIFICATION
  10  *        $Header: /cvsroot/pgsql/src/backend/utils/adt/tid.c,v 1.10 1999/07/16 03:14:11 momjian Exp $
  11  *
  12  * NOTES
  13  *        input routine largely stolen from boxin().
  14  *
  15  *-------------------------------------------------------------------------
  16  */
  17 #include <stdio.h>
  18 #include <string.h>
  19 #include "postgres.h"
  20
  21 #include "utils/builtins.h"
  22
  23 #define LDELIM                  '('
  24 #define RDELIM                  ')'
  25 #define DELIM                   ','
  26 #define NTIDARGS                2
  27
  28 /* ----------------------------------------------------------------
  29  *              tidin
  30  * ----------------------------------------------------------------
  31  */
  32 ItemPointer
  33 tidin(char *str)
  34 {
  35         char       *p,
  36                            *coord[NTIDARGS];
  37         int                     i;
  38         ItemPointer result;
  39
  40         BlockNumber blockNumber;
  41         OffsetNumber offsetNumber;
  42
  43         if (str == NULL)
  44                 return NULL;
  45
  46         for (i = 0, p = str; *p && i < NTIDARGS && *p != RDELIM; p++)
  47                 if (*p == DELIM || (*p == LDELIM && !i))
  48                         coord[i++] = p + 1;
  49
  50         if (i < NTIDARGS - 1)
  51                 return NULL;
  52
  53         blockNumber = (BlockNumber) atoi(coord[0]);
  54         offsetNumber = (OffsetNumber) atoi(coord[1]);
  55
  56         result = (ItemPointer) palloc(sizeof(ItemPointerData));
  57
  58         ItemPointerSet(result, blockNumber, offsetNumber);
  59
  60         return result;
  61 }
  62
  63 /* ----------------------------------------------------------------
  64  *              tidout
  65  * ----------------------------------------------------------------
  66  */
  67 char *
  68 tidout(ItemPointer itemPtr)
  69 {
  70         BlockNumber blockNumber;
  71         OffsetNumber offsetNumber;
  72         BlockId         blockId;
  73         char            buf[32];
  74         char       *str;
  75
  76         blockId = &(itemPtr->ip_blkid);
  77
  78         blockNumber = BlockIdGetBlockNumber(blockId);
  79         offsetNumber = itemPtr->ip_posid;
  80
  81         sprintf(buf, "(%d,%d)", blockNumber, offsetNumber);
  82
  83         str = (char *) palloc(strlen(buf) + 1);
  84         strcpy(str, buf);
  85
  86         return str;
  87 }