129 lines
2.2 KiB
C
129 lines
2.2 KiB
C
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/*++
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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dbgprint.c
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Abstract:
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WinDbg Extension Api
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Author:
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Wesley Witt (wesw) 15-Aug-1993
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Environment:
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User Mode.
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Revision History:
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--*/
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#include "precomp.h"
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#pragma hdrstop
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DECLARE_API( dbgprint )
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/*++
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Routine Description:
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This routine dumps the DbgPrint buffer.
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Arguments:
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args - not used
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Return Value:
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None
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--*/
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{
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ULONG64 BufferBase;
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ULONG64 BufferEnd;
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ULONG64 WritePointer;
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PUCHAR LocalBuffer;
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PUCHAR LocalBufferEnd;
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PUCHAR p;
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PUCHAR Start;
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ULONG result;
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BufferBase = GetNtDebuggerData( KdPrintCircularBuffer );
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BufferEnd = GetNtDebuggerData( KdPrintCircularBufferEnd );
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WritePointer = GetNtDebuggerDataPtrValue( KdPrintWritePointer );
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if (!BufferBase || !BufferEnd || !WritePointer) {
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dprintf("Can't find DbgPrint buffer\n");
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goto exit;
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}
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LocalBuffer = LocalAlloc(LPTR, (ULONG) ( BufferEnd - BufferBase));
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if (!LocalBuffer) {
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dprintf("Could not allocate memory for local copy of DbgPrint buffer\n");
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goto exit;
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}
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if ((!ReadMemory(BufferBase,
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LocalBuffer,
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(ULONG) (BufferEnd - BufferBase),
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&result)) || (result < BufferEnd - BufferBase)) {
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dprintf("%08p: Could not read DbgPrint buffer\n", BufferBase);
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goto exit;
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}
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LocalBufferEnd = LocalBuffer + BufferEnd - BufferBase;
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Start = LocalBuffer + ((ULONG) WritePointer - BufferBase);
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p = Start;
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do {
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//
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// consume NULs
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//
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while (p < LocalBufferEnd && *p == 0) {
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p++;
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}
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if (p < LocalBufferEnd) {
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//
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// print a string and consume it
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//
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dprintf("%s", p);
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while (p < LocalBufferEnd && *p != 0) {
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p++;
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}
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}
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} while (p < LocalBufferEnd);
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//
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// repeat until we hit the start
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//
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p = LocalBuffer;
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while (p < Start && *p == 0) {
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p++;
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}
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if (p < Start) {
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dprintf("%s", p);
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while (p < Start && *p != 0) {
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p++;
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}
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}
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exit:
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if (LocalBuffer) {
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LocalFree( LocalBuffer );
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}
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return S_OK;
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}
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