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/*++
Copyright (c) 2000, 2001 Microsoft Corporation
Module Name:
AppAndCommandLine.cpp
Abstract:
This class takes an application name and command line and parses them *exactly* as as they would by CreateProcess. If the Set routine returns TRUE, then the application name will contain a value; however, it does not guarantee that the application actually exists.
Example: AppAndCommandLine.Set(NULL, "notepad.exe readme.txt"); GetApplicationName() == "notepad.exe" GetCommandline() == "notepad.exe readme.txt" GetCommandlineNoAppName() == "readme.txt"
Notes:
None
History:
07/21/2000 robkenny Created 12/18/2000 prashkud Modified GetAppAndCommandLine to fix the AV caused by EmulateGetCommandLine when the layer was applied to Oregon Trail 4th Edition. 03/04/2001 robkenny Converted to use CString 03/29/2001 prashkud Modified GetAppnameAndCommandline to set the application name even when there is only Commandline passed and the application name passed is NULL. 08/14/2001 robkenny Moved code inside the ShimLib namespace.
--*/
#include "ShimLib.h"
namespace ShimLib{
AppAndCommandLine::AppAndCommandLine(const char * applicationName, const char * commandLine){ CString csApp(applicationName); CString csCl(commandLine);
GetAppnameAndCommandline(csApp.GetNIE(), csCl.GetNIE());}
AppAndCommandLine::AppAndCommandLine(const WCHAR * applicationName, const WCHAR * commandLine){ GetAppnameAndCommandline(applicationName, commandLine);}
// If the application name is the first entry on the command line,
// we convert the appName to its short name; thereby removing any spaces.
const CString & AppAndCommandLine::GetShortCommandLine(){ // If lpCommandLineNoAppName is not the same as lpCommandLine,
// then the command line contains the application name.
if ( csShortCommandLine.IsEmpty() && // Haven't been here
!csApplicationName.IsEmpty() && // Set() has been called
!csCommandLine.IsEmpty() && // Set() has been called
csShortCommandLine.GetLength() != csCommandLine.GetLength()) // Command line actually contains app name
{ csShortCommandLine = csApplicationName; csShortCommandLine.GetShortPathNameW(); csShortCommandLine += L" "; csShortCommandLine += csCommandLineNoAppName; }
// If we still don't have a short version of the command line,
// just duplicate the current command line
if (csShortCommandLine.IsEmpty()) { csShortCommandLine = csCommandLine; } return csShortCommandLine;}
BOOL AppAndCommandLine::GetAppnameAndCommandline(const WCHAR * lpcApp, const WCHAR * lpcCl){ BOOL SearchRetry = TRUE; ULONG Length = 0; WCHAR * NameBuffer = NULL; BOOL success = FALSE; DWORD dwAppNameLen = 0; CString csTempAppName; BOOL bFound = TRUE;
// It is really, really bad to remove the const from the Get,
// However we never change the length of the string, so it should be okay
WCHAR * lpApplicationName = (WCHAR *)lpcApp; WCHAR * lpCommandLine = (WCHAR *)lpcCl;
// The following is done as there are lot of instances when the
// the pointer is not NULL but contains an EMPTY string.
if (lpApplicationName && !(*lpApplicationName)) { lpApplicationName = NULL; }
if (lpCommandLine && !(*lpCommandLine)) { lpCommandLine = NULL; }
if (lpApplicationName == NULL && lpCommandLine == NULL) { // Degenerate case
csApplicationName = L""; csCommandLine = csApplicationName; csCommandLineNoAppName = csApplicationName; return FALSE; // Didn't find application name
}
csCommandLine = lpCommandLine;
DPF("Common", eDbgLevelSpew, "[AppAndCommandLineT::Set] BEFORE App(%S) CL(%S)\n", lpApplicationName, lpCommandLine);
if (lpApplicationName == NULL) { DWORD fileattr; WCHAR TempChar; //
// Locate the image
//
NameBuffer = (WCHAR *) malloc(MAX_PATH * sizeof( WCHAR )); if ( !NameBuffer ) { goto errorExit; } lpApplicationName = lpCommandLine; WCHAR * TempNull = lpApplicationName; WCHAR * WhiteScan = lpApplicationName; DWORD QuoteFound = 0;
//
// check for lead quote
//
if ( *WhiteScan == L'\"' ) { SearchRetry = FALSE; WhiteScan++; lpApplicationName = WhiteScan; while(*WhiteScan) { if ( *WhiteScan == L'\"' ) { TempNull = WhiteScan; QuoteFound = 2; break; } WhiteScan++; TempNull = WhiteScan; } } else {retrywsscan: lpApplicationName = lpCommandLine; while(*WhiteScan) { if ( *WhiteScan == L' ' || *WhiteScan == L'\t' ) { TempNull = WhiteScan; break; } WhiteScan++; TempNull = WhiteScan; } } TempChar = *TempNull; *TempNull = 0;
WCHAR * filePart; Length = SearchPathW( NULL, lpApplicationName, L".exe", MAX_PATH, NameBuffer, &filePart )*sizeof(WCHAR);
if (Length != 0 && Length < MAX_PATH * sizeof( WCHAR )) { //
// SearchPathW worked, but file might be a directory
// if this happens, we need to keep trying
//
fileattr = GetFileAttributesW(NameBuffer); if ( fileattr != 0xffffffff && (fileattr & FILE_ATTRIBUTE_DIRECTORY) ) { Length = 0; } else { Length++; Length++; } }
if ( !Length || Length >= MAX_PATH<<1 ) {
//
// restore the command line
//
*TempNull = TempChar; lpApplicationName = NameBuffer;
//
// If we still have command line left, then keep going
// the point is to march through the command line looking
// for whitespace so we can try to find an image name
// launches of things like:
// c:\word 95\winword.exe /embedding -automation
// require this. Our first iteration will stop at c:\word, our next
// will stop at c:\word 95\winword.exe
//
if (*WhiteScan && SearchRetry) { WhiteScan++; TempNull = WhiteScan; goto retrywsscan; }
// If we are here then the Application has not been found.
// We used to send back lpApplicationName as NULL earlier
// but now instead we fill the ApplicationName with the
// commandline till the first space or tab.This was added
// to support EmulateMissingExe SHIM which will fail if
// we return NULL as we used to earlier.
bFound = FALSE; if (QuoteFound == 0) { // No quotes were found.
lpApplicationName = lpCommandLine;
// Since we just reset to the entire command line, we need to skip leading white space
SkipBlanksW(lpApplicationName);
TempNull = lpApplicationName;
while (*TempNull) { if ((*TempNull == L' ') || (*TempNull == L'\t') ) { TempChar = *TempNull; *TempNull = 0; break; } TempNull++; } } else { // Quotes were found.
*TempNull = 0; }
csTempAppName = lpApplicationName; *TempNull = TempChar; dwAppNameLen = (DWORD)(TempNull - lpApplicationName) + QuoteFound; lpApplicationName = (WCHAR*)csTempAppName.Get();
goto successExit; }
dwAppNameLen = (DWORD)(TempNull - lpApplicationName) + QuoteFound;
//
// restore the command line
//
*TempNull = TempChar; lpApplicationName = NameBuffer; } else if (lpCommandLine == NULL || *lpCommandLine == 0 ) { lpCommandLine = lpApplicationName; dwAppNameLen = wcslen(lpApplicationName); }
// If they provided both, check to see if the app name
// is the first entry on the command line.
else if (lpApplicationName != NULL && lpCommandLine != NULL ) { int appNameLen = wcslen(lpApplicationName);
if ( _wcsnicmp(lpApplicationName, lpCommandLine, appNameLen) == 0 && (lpCommandLine[appNameLen] == 0 || iswspace(lpCommandLine[appNameLen])) ) { // lpApplicationName is the first entry on the command line
dwAppNameLen = appNameLen; } // check for quoted lpApplicationName
else if ( lpCommandLine[0] == L'"' && _wcsnicmp(lpApplicationName, lpCommandLine+1, appNameLen) == 0 && lpCommandLine[appNameLen+1] == L'"' && (lpCommandLine[appNameLen+2] == 0 || iswspace(lpCommandLine[appNameLen+2])) ) { // lpApplicationName is the first *quoted* entry on the command line
dwAppNameLen = appNameLen + 2; } else { // Didn't find the application name at the beginning of the command line
dwAppNameLen = 0; } }
successExit: if (bFound) { success = TRUE; }
csApplicationName = lpApplicationName; csCommandLineNoAppName = lpCommandLine + dwAppNameLen; csCommandLineNoAppName.TrimLeft();
errorExit:
free(NameBuffer);
DPF("Common", eDbgLevelSpew, "[AppAndCommandLineT::Set] AFTER App(%S) CL(%S)\n", csApplicationName.Get(), csCommandLine.Get()); DPF("Common", eDbgLevelSpew, "[AppAndCommandLineT::Set] CL without App(%S)\n", csCommandLineNoAppName.Get());
return success;}
}; // end of namespace ShimLib
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