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 1.11 1999/07/17 20:18:00 momjian Exp $
  11  *
  12  * NOTES
  13  *        input routine largely stolen from boxin().
  14  *
  15  *-------------------------------------------------------------------------
  16  */
  17
  18 #include "postgres.h"
  19 #include "utils/builtins.h"
  20
  21 #define LDELIM                  '('
  22 #define RDELIM                  ')'
  23 #define DELIM                   ','
  24 #define NTIDARGS                2
  25
  26 /* ----------------------------------------------------------------
  27  *              tidin
  28  * ----------------------------------------------------------------
  29  */
  30 ItemPointer
  31 tidin(char *str)
  32 {
  33         char       *p,
  34                            *coord[NTIDARGS];
  35         int                     i;
  36         ItemPointer result;
  37
  38         BlockNumber blockNumber;
  39         OffsetNumber offsetNumber;
  40
  41         if (str == NULL)
  42                 return NULL;
  43
  44         for (i = 0, p = str; *p && i < NTIDARGS && *p != RDELIM; p++)
  45                 if (*p == DELIM || (*p == LDELIM && !i))
  46                         coord[i++] = p + 1;
  47
  48         if (i < NTIDARGS - 1)
  49                 return NULL;
  50
  51         blockNumber = (BlockNumber) atoi(coord[0]);
  52         offsetNumber = (OffsetNumber) atoi(coord[1]);
  53
  54         result = (ItemPointer) palloc(sizeof(ItemPointerData));
  55
  56         ItemPointerSet(result, blockNumber, offsetNumber);
  57
  58         return result;
  59 }
  60
  61 /* ----------------------------------------------------------------
  62  *              tidout
  63  * ----------------------------------------------------------------
  64  */
  65 char *
  66 tidout(ItemPointer itemPtr)
  67 {
  68         BlockNumber blockNumber;
  69         OffsetNumber offsetNumber;
  70         BlockId         blockId;
  71         char            buf[32];
  72         char       *str;
  73
  74         blockId = &(itemPtr->ip_blkid);
  75
  76         blockNumber = BlockIdGetBlockNumber(blockId);
  77         offsetNumber = itemPtr->ip_posid;
  78
  79         sprintf(buf, "(%d,%d)", blockNumber, offsetNumber);
  80
  81         str = (char *) palloc(strlen(buf) + 1);
  82         strcpy(str, buf);
  83
  84         return str;
  85 }