Sample Code

windows driver samples/ USBView sample application/ C++/ debug.c/

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/*++
 
Copyright (c) 1997-2008 Microsoft Corporation
 
Module Name:
 
    DEBUG.C
 
Abstract:
 
    This source file contains debug routines.
 
Environment:
 
    user mode
 
Revision History:
 
    07-08-97 : created
 
--*/
 
/*****************************************************************************
 I N C L U D E S
*****************************************************************************/
 
#include "uvcview.h"
 
#if DBG
 
/*****************************************************************************
 T Y P E D E F S
*****************************************************************************/
 
typedef struct _ALLOCHEADER
{
    LIST_ENTRY  ListEntry;
 
    PCHAR       File;
 
    ULONG       Line;
 
} ALLOCHEADER, *PALLOCHEADER;
 
 
/*****************************************************************************
 G L O B A L S
*****************************************************************************/
 
LIST_ENTRY AllocListHead =
{
    &AllocListHead,
    &AllocListHead
};
 
 
/*****************************************************************************
 
 MyAlloc()
 
*****************************************************************************/
_Success_(return != NULL)
_Post_writable_byte_size_(dwBytes)
HGLOBAL
MyAlloc (
    _In_    PCHAR   File,
    ULONG   Line,
    DWORD   dwBytes
)
{
    PALLOCHEADER header;
    DWORD dwRequest = dwBytes;
 
    if (0 == dwBytes)
    {
        return NULL;
    }
 
    dwBytes += sizeof(ALLOCHEADER);
    // check for integer overflow
    if (dwBytes > dwRequest)
    {
        header = (PALLOCHEADER)GlobalAlloc(GPTR, dwBytes);
 
        if (header != NULL)
        {
            InsertTailList(&AllocListHead, &header->ListEntry);
 
            header->File = File;
            header->Line = Line;
 
            return (HGLOBAL)(header + 1);
        }
    }
    return NULL;
}
 
/*****************************************************************************
 
 MyReAlloc()
 
*****************************************************************************/
 
_Success_(return != NULL)
_Post_writable_byte_size_(dwBytes)
HGLOBAL
MyReAlloc (
    HGLOBAL hMem,
    DWORD   dwBytes
)
{
    PALLOCHEADER header;
    PALLOCHEADER headerNew;
 
    if ((NULL == hMem) || (0 == dwBytes))
    {
        return NULL;
    }
     
    header = (PALLOCHEADER)hMem;
    header--;
 
    // Remove the old address from the allocation list
    //
    RemoveEntryList(&header->ListEntry);
 
    if (dwBytes < (dwBytes + (DWORD) sizeof(ALLOCHEADER)))
        {
        dwBytes += sizeof(ALLOCHEADER);
        headerNew = GlobalReAlloc((HGLOBAL)header, dwBytes, GMEM_MOVEABLE|GMEM_ZEROINIT);
 
        if (NULL == headerNew)
        {
            // If GlobalReAlloc fails, the original memory is not freed,
            // and the original handle and pointer are still valid.
            // Add the old address back to the allocation list.
            //
            InsertTailList(&AllocListHead, &header->ListEntry);
        }
        else
        {
            // Add the new address to the allocation list
            //
            InsertTailList(&AllocListHead, &headerNew->ListEntry);
 
            return (HGLOBAL)(headerNew + 1);
        }
    }
    return NULL;
}
 
 
/*****************************************************************************
 
 MyFree()
 
*****************************************************************************/
 
HGLOBAL
MyFree (
    HGLOBAL hMem
)
{
    PALLOCHEADER header;
 
    if (hMem)
    {
        header = (PALLOCHEADER)hMem;
 
        header--;
 
        RemoveEntryList(&header->ListEntry);
 
        return GlobalFree((HGLOBAL)header);
    }
 
    return GlobalFree(hMem);
}
 
/*****************************************************************************
 
 MyCheckForLeaks()
 
*****************************************************************************/
 
VOID
MyCheckForLeaks (
    VOID
)
{
    PALLOCHEADER header;
    CHAR         buf[128];
 
    memset(buf, 0, sizeof(buf));
 
    while (!IsListEmpty(&AllocListHead))
    {
        header = (PALLOCHEADER)RemoveHeadList(&AllocListHead);
 
        StringCbPrintf(buf, sizeof(buf),
                 "File: %s, Line: %d\r\n",
                 header->File,
                 header->Line);
 
        OutputDebugString(buf);
    }
}
 
#endif

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