366 lines
8.6 KiB
C
366 lines
8.6 KiB
C
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/*++
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Copyright (c) 2000-2001 Microsoft Corporation
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Module Name:
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perfutil.c
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Abstract:
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This file implements various utility routines.
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Created:
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davj 17-May-2000
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Revision History:
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--*/
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//
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// include files
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//
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#include <windows.h>
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#include <string.h>
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#include <winperf.h>
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#include "genctrs.h" // error message definition
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#include "perfmsg.h"
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#include "perfutil.h"
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//
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// Global data definitions.
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//
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HANDLE hEventLog = NULL; // event log handle for reporting events
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// initialized in Open... routines
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DWORD dwLogUsers = 0; // count of functions using event log
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DWORD MESSAGE_LEVEL = 0;
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WCHAR GLOBAL_STRING[] = L"Global";
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WCHAR FOREIGN_STRING[] = L"Foreign";
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WCHAR COSTLY_STRING[] = L"Costly";
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WCHAR NULL_STRING[] = L"\0"; // pointer to null string
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// test for delimiter, end of line and non-digit characters
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// used by IsNumberInUnicodeList routine
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//
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#define DIGIT 1
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#define DELIMITER 2
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#define INVALID 3
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#define EvalThisChar(c,d) ( \
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(c == d) ? DELIMITER : \
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(c == 0) ? DELIMITER : \
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(c < (WCHAR)'0') ? INVALID : \
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(c > (WCHAR)'9') ? INVALID : \
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DIGIT)
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HANDLE
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MonOpenEventLog (
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)
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/*++
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Routine Description:
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Reads the level of event logging from the registry and opens the
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channel to the event logger for subsequent event log entries.
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Arguments:
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None
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Return Value:
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Handle to the event log for reporting events.
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NULL if open not successful.
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--*/
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{
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HKEY hAppKey;
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LONG lStatus;
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DWORD dwLogLevel;
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DWORD dwValueType;
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DWORD dwValueSize;
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// if global value of the logging level not initialized or is disabled,
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// check the registry to see if it should be updated.
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if (!MESSAGE_LEVEL) {
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lStatus = RegOpenKeyEx (HKEY_LOCAL_MACHINE,
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"SOFTWARE\\Microsoft\\wbem\\cimom",
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0,
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KEY_READ,
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&hAppKey);
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dwValueSize = sizeof (dwLogLevel);
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if (lStatus == ERROR_SUCCESS) {
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BYTE bArray[8];
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dwValueSize = 8;
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lStatus = RegQueryValueEx (hAppKey,
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"Logging",
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(LPDWORD)NULL,
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&dwValueType,
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(LPBYTE)bArray,
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&dwValueSize);
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if (lStatus == ERROR_SUCCESS) {
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if(bArray[0] == '2' && bArray[1] == 0)
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MESSAGE_LEVEL = LOG_VERBOSE;
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else if(bArray[0] == '0' && bArray[1] == 0)
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MESSAGE_LEVEL = LOG_NONE;
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else
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MESSAGE_LEVEL = LOG_ERROR;
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} else {
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MESSAGE_LEVEL = MESSAGE_LEVEL_DEFAULT;
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}
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RegCloseKey (hAppKey);
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} else {
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MESSAGE_LEVEL = MESSAGE_LEVEL_DEFAULT;
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}
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}
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if (hEventLog == NULL){
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hEventLog = RegisterEventSource (
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(LPTSTR)NULL, // Use Local Machine
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"WMIPerf"); // event log app name to find in registry
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if (hEventLog != NULL) {
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REPORT_INFORMATION (UTIL_LOG_OPEN, LOG_VERBOSE);
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}
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}
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if (hEventLog != NULL) {
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dwLogUsers++; // increment count of perfctr log users
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}
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return (hEventLog);
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}
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VOID
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MonCloseEventLog (
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)
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/*++
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Routine Description:
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Closes the handle to the event logger if this is the last caller
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Arguments:
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None
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Return Value:
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None
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--*/
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{
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if (hEventLog != NULL) {
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dwLogUsers--; // decrement usage
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if (dwLogUsers <= 0) { // and if we're the last, then close up log
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REPORT_INFORMATION (UTIL_CLOSING_LOG, LOG_VERBOSE);
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DeregisterEventSource (hEventLog);
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}
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}
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}
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DWORD
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GetQueryType (
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IN LPWSTR lpValue
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)
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/*++
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GetQueryType
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returns the type of query described in the lpValue string so that
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the appropriate processing method may be used
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Arguments
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IN lpValue
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string passed to PerfRegQuery Value for processing
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Return Value
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QUERY_GLOBAL
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if lpValue == 0 (null pointer)
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lpValue == pointer to Null string
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lpValue == pointer to "Global" string
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QUERY_FOREIGN
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if lpValue == pointer to "Foriegn" string
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QUERY_COSTLY
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if lpValue == pointer to "Costly" string
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otherwise:
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QUERY_ITEMS
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--*/
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{
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WCHAR *pwcArgChar, *pwcTypeChar;
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BOOL bFound;
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if (lpValue == 0) {
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return QUERY_GLOBAL;
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} else if (*lpValue == 0) {
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return QUERY_GLOBAL;
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}
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// check for "Global" request
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pwcArgChar = lpValue;
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pwcTypeChar = GLOBAL_STRING;
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bFound = TRUE; // assume found until contradicted
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// check to the length of the shortest string
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while ((*pwcArgChar != 0) && (*pwcTypeChar != 0)) {
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if (*pwcArgChar++ != *pwcTypeChar++) {
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bFound = FALSE; // no match
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break; // bail out now
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}
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}
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if (bFound) return QUERY_GLOBAL;
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// check for "Foreign" request
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pwcArgChar = lpValue;
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pwcTypeChar = FOREIGN_STRING;
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bFound = TRUE; // assume found until contradicted
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// check to the length of the shortest string
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while ((*pwcArgChar != 0) && (*pwcTypeChar != 0)) {
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if (*pwcArgChar++ != *pwcTypeChar++) {
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bFound = FALSE; // no match
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break; // bail out now
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}
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}
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if (bFound) return QUERY_FOREIGN;
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// check for "Costly" request
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pwcArgChar = lpValue;
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pwcTypeChar = COSTLY_STRING;
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bFound = TRUE; // assume found until contradicted
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// check to the length of the shortest string
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while ((*pwcArgChar != 0) && (*pwcTypeChar != 0)) {
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if (*pwcArgChar++ != *pwcTypeChar++) {
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bFound = FALSE; // no match
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break; // bail out now
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}
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}
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if (bFound) return QUERY_COSTLY;
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// if not Global and not Foreign and not Costly,
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// then it must be an item list
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return QUERY_ITEMS;
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}
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BOOL
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IsNumberInUnicodeList (
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IN DWORD dwNumber,
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IN LPWSTR lpwszUnicodeList
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)
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/*++
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IsNumberInUnicodeList
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Arguments:
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IN dwNumber
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DWORD number to find in list
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IN lpwszUnicodeList
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Null terminated, Space delimited list of decimal numbers
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Return Value:
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TRUE:
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dwNumber was found in the list of unicode number strings
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FALSE:
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dwNumber was not found in the list.
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--*/
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{
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DWORD dwThisNumber;
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WCHAR *pwcThisChar;
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BOOL bValidNumber;
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BOOL bNewItem;
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WCHAR wcDelimiter; // could be an argument to be more flexible
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if (lpwszUnicodeList == 0) return FALSE; // null pointer, # not founde
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pwcThisChar = lpwszUnicodeList;
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dwThisNumber = 0;
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wcDelimiter = (WCHAR)' ';
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bValidNumber = FALSE;
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bNewItem = TRUE;
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while (TRUE) {
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switch (EvalThisChar (*pwcThisChar, wcDelimiter)) {
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case DIGIT:
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// if this is the first digit after a delimiter, then
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// set flags to start computing the new number
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if (bNewItem) {
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bNewItem = FALSE;
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bValidNumber = TRUE;
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}
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if (bValidNumber) {
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dwThisNumber *= 10;
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dwThisNumber += (*pwcThisChar - (WCHAR)'0');
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}
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break;
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case DELIMITER:
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// a delimter is either the delimiter character or the
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// end of the string ('\0') if when the delimiter has been
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// reached a valid number was found, then compare it to the
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// number from the argument list. if this is the end of the
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// string and no match was found, then return.
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//
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if (bValidNumber) {
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if (dwThisNumber == dwNumber) return TRUE;
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bValidNumber = FALSE;
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}
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if (*pwcThisChar == 0) {
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return FALSE;
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} else {
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bNewItem = TRUE;
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dwThisNumber = 0;
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}
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break;
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case INVALID:
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// if an invalid character was encountered, ignore all
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// characters up to the next delimiter and then start fresh.
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// the invalid number is not compared.
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bValidNumber = FALSE;
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break;
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default:
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break;
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}
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pwcThisChar++;
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}
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return FALSE;
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} // IsNumberInUnicodeList
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