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 1.8 1999/07/15 15:20:20 momjian Exp $
  11  *
  12  * NOTES
  13  *        input routine largely stolen from boxin().
  14  *
  15  *-------------------------------------------------------------------------
  16  */
  17 #include <stdio.h>                              /* for sprintf() */
  18 #include <string.h>
  19 #include "postgres.h"
  20 #include "storage/bufpage.h"
  21
  22 #include "utils/builtins.h"             /* where function declarations go */
  23
  24 #define LDELIM                  '('
  25 #define RDELIM                  ')'
  26 #define DELIM                   ','
  27 #define NTIDARGS                2
  28
  29 /* ----------------------------------------------------------------
  30  *              tidin
  31  * ----------------------------------------------------------------
  32  */
  33 ItemPointer
  34 tidin(char *str)
  35 {
  36         char       *p,
  37                            *coord[NTIDARGS];
  38         int                     i;
  39         ItemPointer result;
  40
  41         BlockNumber blockNumber;
  42         OffsetNumber offsetNumber;
  43
  44         if (str == NULL)
  45                 return NULL;
  46
  47         for (i = 0, p = str; *p && i < NTIDARGS && *p != RDELIM; p++)
  48                 if (*p == DELIM || (*p == LDELIM && !i))
  49                         coord[i++] = p + 1;
  50
  51         if (i < NTIDARGS - 1)
  52                 return NULL;
  53
  54         blockNumber = (BlockNumber) atoi(coord[0]);
  55         offsetNumber = (OffsetNumber) atoi(coord[1]);
  56
  57         result = (ItemPointer) palloc(sizeof(ItemPointerData));
  58
  59         ItemPointerSet(result, blockNumber, offsetNumber);
  60
  61         return result;
  62 }
  63
  64 /* ----------------------------------------------------------------
  65  *              tidout
  66  * ----------------------------------------------------------------
  67  */
  68 char *
  69 tidout(ItemPointer itemPtr)
  70 {
  71         BlockNumber blockNumber;
  72         OffsetNumber offsetNumber;
  73         BlockId         blockId;
  74         char            buf[32];
  75         char       *str;
  76
  77         blockId = &(itemPtr->ip_blkid);
  78
  79         blockNumber = BlockIdGetBlockNumber(blockId);
  80         offsetNumber = itemPtr->ip_posid;
  81
  82         sprintf(buf, "(%d,%d)", blockNumber, offsetNumber);
  83
  84         str = (char *) palloc(strlen(buf) + 1);
  85         strcpy(str, buf);
  86
  87         return str;
  88 }