libdb/memory.c

   1 /* -*- Mode: C ; c-basic-offset: 2 -*- */
   2 /*****************************************************************************
   3  *
   4  * $Id: memory.c,v 1.3 2004/05/16 19:10:54 nedko Exp $
   5  *
   6  * DESCRIPTION:
   7  *  Memory helper implementations.
   8  *
   9  * AUTHOR:
  10  *  Nedko Arnaudov <nedko@users.sourceforge.net>
  11  *
  12  * LICENSE:
  13  *  GNU GENERAL PUBLIC LICENSE version 2
  14  *
  15  *****************************************************************************/
  16
  17 #include <stdlib.h>
  18 #include <string.h>
  19
  20 #include "../result.h"
  21 #include "libdb.h"
  22 #include "memory.h"
  23
  24 #define BUFFER_INITIAL_ADD 4096
  25 #define BUFFER_ADD         4096
  26
  27 mediadb_result
  28 maybe_enlarge_buffer(
  29   char ** ppBuffer,
  30   size_t *pnBufferSize,
  31   size_t nSizeRequired)
  32 {
  33   char *pNewBuffer;
  34   size_t nNewBufferSize;
  35
  36   if (nSizeRequired <= *pnBufferSize)
  37     return MEDIADB_OK;
  38
  39   if (*pnBufferSize == 0 || *ppBuffer == NULL)
  40   {
  41     /* Allocate */
  42
  43     nNewBufferSize = nSizeRequired + BUFFER_INITIAL_ADD;
  44
  45     pNewBuffer = (char *)malloc(nNewBufferSize);
  46     if (pNewBuffer == NULL)
  47     {
  48       //"Cannot allocate %u bytes of memory.",
  49       //(unsigned int)nNewBufferSize
  50       return MEDIADB_MEM;
  51     }
  52   }
  53   else
  54   {
  55     /* Reallocate */
  56
  57     nNewBufferSize = nSizeRequired + BUFFER_ADD;
  58
  59     pNewBuffer = (char *)malloc(nNewBufferSize);
  60     if (pNewBuffer == NULL)
  61     {
  62       // "Cannot allocate %u bytes of memory.",
  63       //(unsigned int)nNewBufferSize
  64       return MEDIADB_MEM;
  65     }
  66
  67     memcpy(pNewBuffer, *ppBuffer, *pnBufferSize);
  68
  69     free(*ppBuffer);
  70   }
  71
  72
  73   *pnBufferSize = nNewBufferSize;
  74   *ppBuffer = pNewBuffer;
  75
  76   return MEDIADB_OK;
  77 }
  78
  79 /*****************************************************************************
  80  *
  81  * Modifications log:
  82  *
  83  * !!! WARNING !!! Following lines are automatically updated by the CVS system.
  84  *
  85  *   $Log: memory.c,v $
  86  *   Revision 1.3  2004/05/16 19:10:54  nedko
  87  *   Write header information.
  88  *
  89  *   Revision 1.2  2004/05/16 18:58:50  nedko
  90  *   mediadb_result has became more general, it is not specific to libdb
  91  *
  92  *   Revision 1.1  2004/05/02 20:12:11  nedko
  93  *   Improve error dumps.
  94  *
  95  *****************************************************************************/