905 lines
21 KiB
C++
905 lines
21 KiB
C++
//---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1995
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//
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// File: parse.cxx
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//
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// Contents: NDS Pathname Parser
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//
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// The Pathname Parser is a key component in ADs providers. It checks for
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// syntactic validity of an ADs pathname that has been passed to this
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// provider. If the syntax is valid, then an OBJECTINFO structure is
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// constructed. This OBJECTINFO structure contains a componentized version
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// of the ADs pathname for this object.
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//
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// Note all that is being done is a syntax check. Rather than special-case
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// every single new nuance to pathnames, all path checking must conform to
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// the grammar rules laid out by the parser.
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//
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//
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//
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// History:
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//----------------------------------------------------------------------------
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#include "nds.hxx"
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#pragma hdrstop
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// Object -> PathName, Type, eos
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// Object -> PathName, eos
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//+---------------------------------------------------------------------------
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// Function: ADsObject
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//
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// Synopsis: parses an ADs pathname passed to this provider. This function
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// parses the following grammar rules
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//
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// <ADsObject> -> <ProviderName> <NDSObject>
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//
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//
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// Arguments: [CLexer * pTokenizer] - a lexical analyzer object
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// [POBJECTINFO pObjectInfo] - a pointer to an OBJECTINFO structure
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//
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// Returns: [HRESULT] 0 if successful, error HRESULT if not
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//
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// Modifies: pTokenizer (consumes the input buffer)
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//
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// History: 11-3-95 krishnag Created.
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//
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//----------------------------------------------------------------------------
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HRESULT
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ADsObject(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
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{
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WCHAR szToken[MAX_TOKEN_LENGTH];
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DWORD dwToken;
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HRESULT hr;
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hr = ProviderName(pTokenizer, pObjectInfo);
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BAIL_IF_ERROR(hr);
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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switch (dwToken) {
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case TOKEN_END:
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RRETURN(S_OK);
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case TOKEN_COMMA:
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hr = Type(pTokenizer, pObjectInfo);
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BAIL_IF_ERROR(hr);
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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if (dwToken == TOKEN_END) {
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RRETURN(S_OK);
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}else {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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default:
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hr = pTokenizer->PushBackToken();
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hr = NDSObject(pTokenizer, pObjectInfo);
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BAIL_IF_ERROR(hr);
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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switch (dwToken) {
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case TOKEN_END:
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RRETURN(S_OK);
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case TOKEN_COMMA:
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hr = Type(pTokenizer, pObjectInfo);
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BAIL_IF_ERROR(hr);
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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if (dwToken == TOKEN_END) {
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RRETURN(S_OK);
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}else {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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default:
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RRETURN(E_FAIL);
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}
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}
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cleanup:
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RRETURN(hr);
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}
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//+---------------------------------------------------------------------------
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// Function: NDSObject
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//
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// Synopsis: parses an ADs pathname passed to this provider. This function
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// parses the following grammar rules
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//
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// <NDSObject> -> "\\""identifier""\" <PathName>
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//
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//
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// Arguments: [CLexer * pTokenizer] - a lexical analyzer object
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// [POBJECTINFO pObjectInfo] - a pointer to an OBJECTINFO structure
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//
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// Returns: [HRESULT] 0 if successful, error HRESULT if not
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//
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// Modifies: pTokenizer (consumes the input buffer)
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//
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// History: 11-3-95 krishnag Created.
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//
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//----------------------------------------------------------------------------
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HRESULT
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NDSObject(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
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{
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WCHAR szToken[MAX_TOKEN_LENGTH];
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WCHAR szDisplayToken[MAX_TOKEN_LENGTH];
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DWORD dwToken;
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HRESULT hr;
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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if ((dwToken != TOKEN_FSLASH) ) {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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if ((dwToken != TOKEN_FSLASH) ) {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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hr = pTokenizer->GetNextToken(szToken, szDisplayToken, &dwToken);
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BAIL_IF_ERROR(hr);
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if (dwToken != TOKEN_IDENTIFIER) {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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hr = AddTreeName(pObjectInfo, szToken, szDisplayToken );
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BAIL_IF_ERROR(hr);
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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//
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// If we get an TOKEN_END, then we have a tree name only \\<tree_name>
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//
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if (dwToken == TOKEN_END || dwToken == TOKEN_COMMA) {
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hr = pTokenizer->PushBackToken();
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RRETURN(S_OK);
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}
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if ((dwToken != TOKEN_FSLASH) ) {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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hr = PathName(pTokenizer, pObjectInfo);
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BAIL_IF_ERROR(hr);
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cleanup:
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RRETURN(hr);
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}
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HRESULT
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ProviderName(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
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{
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WCHAR szToken[MAX_TOKEN_LENGTH];
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DWORD dwToken;
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HRESULT hr;
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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if (dwToken == TOKEN_ATSIGN) {
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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if (dwToken != TOKEN_IDENTIFIER) {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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hr = AddProviderName(pObjectInfo, szToken);
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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if (dwToken != TOKEN_EXCLAMATION) {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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}else if (dwToken == TOKEN_IDENTIFIER) {
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hr = AddProviderName(pObjectInfo, szToken);
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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if (dwToken != TOKEN_COLON) {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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}else {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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//
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// You can now disable the processing for "@" and "!" treat them
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// as ordinary characters.
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//
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pTokenizer->SetAtDisabler(TRUE);
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RRETURN(S_OK);
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cleanup:
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RRETURN(hr);
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}
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// PathName -> Component \\ PathName
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// PathName -> Component
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HRESULT
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DsPathName(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
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{
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WCHAR szToken[MAX_TOKEN_LENGTH];
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DWORD dwToken;
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HRESULT hr;
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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if ((dwToken != TOKEN_FSLASH) ) {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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BAIL_IF_ERROR(hr);
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if ((dwToken != TOKEN_FSLASH) ) {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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hr = PathName(pTokenizer, pObjectInfo);
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BAIL_IF_ERROR(hr);
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RRETURN(S_OK);
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cleanup:
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RRETURN(hr);
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}
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//+---------------------------------------------------------------------------
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// Function:
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//
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// Synopsis:
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//
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// Arguments:
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//
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// Returns:
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//
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// Modifies:
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//
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// History: 11-3-95 krishnag Created.
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//
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//----------------------------------------------------------------------------
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HRESULT
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PathName(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
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{
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HRESULT hr;
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WCHAR szToken[MAX_TOKEN_LENGTH];
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DWORD dwToken;
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hr = Component(pTokenizer, pObjectInfo);
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BAIL_IF_ERROR(hr);
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hr = pTokenizer->GetNextToken(szToken, &dwToken);
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if ((dwToken == TOKEN_FSLASH) ) {
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RRETURN (PathName(pTokenizer, pObjectInfo));
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}else {
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hr = pTokenizer->PushBackToken();
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RRETURN (S_OK);
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}
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cleanup:
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RRETURN(hr);
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}
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//+---------------------------------------------------------------------------
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// Function:
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//
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// Synopsis: Component -> <identifier>
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//
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// Arguments:
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//
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// Returns:
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//
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// Modifies:
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//
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// History: 11-3-95 krishnag Created.
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//
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//----------------------------------------------------------------------------
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HRESULT
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Component(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
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{
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WCHAR szValue[MAX_TOKEN_LENGTH];
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WCHAR szDisplayValue[MAX_TOKEN_LENGTH];
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WCHAR szEqual[MAX_TOKEN_LENGTH];
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WCHAR szComponent[MAX_TOKEN_LENGTH];
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WCHAR szDisplayComponent[MAX_TOKEN_LENGTH];
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DWORD dwToken;
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HRESULT hr;
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hr = pTokenizer->GetNextToken(szComponent, szDisplayComponent, &dwToken);
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BAIL_IF_ERROR(hr);
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if (dwToken != TOKEN_IDENTIFIER) {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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hr = pTokenizer->GetNextToken(szEqual, &dwToken);
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BAIL_IF_ERROR(hr);
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if (dwToken == TOKEN_EQUAL) {
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hr = pTokenizer->GetNextToken(szValue, szDisplayValue, &dwToken);
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BAIL_IF_ERROR(hr);
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if (dwToken != TOKEN_IDENTIFIER) {
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RRETURN(E_ADS_BAD_PATHNAME);
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}
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hr = AddComponent(
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pObjectInfo,
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szComponent,
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szValue,
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szDisplayComponent,
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szDisplayValue
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);
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BAIL_IF_ERROR(hr);
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}else {
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hr = AddComponent(pObjectInfo, szComponent, NULL, szDisplayComponent, NULL);
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BAIL_IF_ERROR(hr);
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hr = pTokenizer->PushBackToken();
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BAIL_IF_ERROR(hr);
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}
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RRETURN(S_OK);
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cleanup:
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RRETURN(hr);
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}
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//+---------------------------------------------------------------------------
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// Function:
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//
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// Synopsis:
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//
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// Arguments:
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//
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// Returns:
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//
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// Modifies:
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//
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// History: 11-3-95 krishnag Created.
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//
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//----------------------------------------------------------------------------
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CLexer::CLexer(LPWSTR szBuffer):
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_ptr(NULL),
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_Buffer(NULL),
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_dwLastTokenLength(0),
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_dwLastToken(0),
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_dwEndofString(0),
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_bAtDisabled(FALSE)
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{
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if (!szBuffer || !*szBuffer) {
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return;
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}
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_Buffer = AllocADsStr(szBuffer);
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_ptr = _Buffer;
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}
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//+---------------------------------------------------------------------------
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// Function:
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//
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// Synopsis:
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//
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// Arguments:
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//
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// Returns:
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//
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// Modifies:
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//
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// History: 08-12-96 t-danal Created.
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//
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//----------------------------------------------------------------------------
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CLexer::~CLexer()
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{
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FreeADsStr(_Buffer);
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}
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//+---------------------------------------------------------------------------
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// Function:
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//
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// Synopsis:
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//
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// Arguments:
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//
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// Returns:
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//
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// Modifies:
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//
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// History: 11-3-95 krishnag Created.
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//
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//----------------------------------------------------------------------------
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HRESULT
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CLexer::GetNextToken(LPWSTR szToken, LPWSTR szDisplayToken, LPDWORD pdwToken)
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{
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WCHAR c;
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DWORD state = 0;
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LPWSTR pch = szToken;
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LPWSTR pDisplayCh = szDisplayToken;
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BOOL fEscapeOn = FALSE, fQuotingOn = FALSE;
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memset(szToken, 0, sizeof(WCHAR) * MAX_TOKEN_LENGTH);
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if (szDisplayToken) {
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memset(szDisplayToken, 0, sizeof(TCHAR) * MAX_TOKEN_LENGTH);
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}
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_dwLastTokenLength = 0;
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while (1) {
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c = NextChar();
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switch (state) {
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case 0:
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*pch++ = c;
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_dwLastTokenLength++;
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if (c == TEXT('"')) {
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//
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// Quoting;
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//
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fQuotingOn = TRUE;
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pch--;
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state = 1;
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}else if (c == TEXT('\\')) {
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//
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// Escaping; Ignore the '\' in the token and check to make
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// sure that the next character exists
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//
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pch--;
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fEscapeOn = TRUE;
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state = 1;
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}else if (c == L'/') {
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*pdwToken = TOKEN_FSLASH;
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_dwLastToken = *pdwToken;
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RRETURN(S_OK);
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}else if (c == L',') {
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*pdwToken = TOKEN_COMMA;
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_dwLastToken = *pdwToken;
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RRETURN(S_OK);
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}else if (c == L'='){
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*pdwToken = TOKEN_EQUAL;
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_dwLastToken = *pdwToken;
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RRETURN(S_OK);
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/*
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}else if (c == L'.'){
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*pdwToken = TOKEN_PERIOD;
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_dwLastToken = *pdwToken;
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RRETURN(S_OK);
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*/
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}else if (c == L':'){
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if (!_bAtDisabled) {
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*pdwToken = TOKEN_COLON;
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_dwLastToken = *pdwToken;
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RRETURN(S_OK);
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}else {
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state = 1;
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}
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}else if (c == TEXT('<')) {
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RRETURN(E_FAIL);
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}else if (c == TEXT('>')) {
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RRETURN(E_FAIL);
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}else if (c == L'\0'){
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*pdwToken = TOKEN_END;
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_dwLastToken = *pdwToken;
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RRETURN(S_OK);
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}else if (c == L'@') {
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if (!_bAtDisabled) {
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*pdwToken = TOKEN_ATSIGN;
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_dwLastToken = *pdwToken;
|
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RRETURN(S_OK);
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}else {
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state = 1;
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}
|
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}else if (c == L'!'){
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|
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if (!_bAtDisabled) {
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*pdwToken = TOKEN_EXCLAMATION;
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_dwLastToken = *pdwToken;
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RRETURN(S_OK);
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|
|
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}else {
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state = 1;
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}
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|
|
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}else {
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state = 1;
|
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}
|
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break;
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|
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case 1:
|
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if ((fEscapeOn || fQuotingOn) && c == TEXT('\0') ) {
|
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RRETURN(E_FAIL);
|
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}
|
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else if (fEscapeOn) {
|
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fEscapeOn = FALSE;
|
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*pch++ = c;
|
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_dwLastTokenLength++;
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state = 1;
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break;
|
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}
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else if (fQuotingOn) {
|
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if (c == TEXT('"')) {
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fQuotingOn = FALSE;
|
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}
|
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else {
|
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*pch++ = c;
|
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}
|
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_dwLastTokenLength++;
|
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break;
|
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}
|
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else if (c == TEXT('\\') ) {
|
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fEscapeOn = TRUE;
|
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_dwLastTokenLength++;
|
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|
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break;
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|
|
|
}
|
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else if (c == TEXT('"')) {
|
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fQuotingOn = TRUE;
|
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_dwLastTokenLength++;
|
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break;
|
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}
|
|
else if (c == L'\0' || c == L',' ||
|
|
c == L'=' || c == L'/') {
|
|
PushbackChar();
|
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|
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*pdwToken = TOKEN_IDENTIFIER;
|
|
_dwLastToken = *pdwToken;
|
|
RRETURN (S_OK);
|
|
|
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}else if (c == L'@' || c == L'!' || c == L':' ) {
|
|
|
|
if (!_bAtDisabled) {
|
|
|
|
PushbackChar();
|
|
|
|
*pdwToken = TOKEN_IDENTIFIER;
|
|
_dwLastToken = *pdwToken;
|
|
RRETURN(S_OK);
|
|
|
|
|
|
}else {
|
|
|
|
*pch++ = c;
|
|
_dwLastTokenLength++;
|
|
state = 1;
|
|
break;
|
|
|
|
}
|
|
|
|
}else {
|
|
*pch++ = c;
|
|
_dwLastTokenLength++;
|
|
state = 1;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
RRETURN(E_FAIL);
|
|
}
|
|
|
|
if (pDisplayCh) {
|
|
*pDisplayCh++ = c;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
HRESULT
|
|
CLexer::GetNextToken(LPWSTR szToken, LPDWORD pdwToken)
|
|
{
|
|
RRETURN (GetNextToken(szToken, NULL, pdwToken));
|
|
}
|
|
|
|
|
|
//+---------------------------------------------------------------------------
|
|
// Function:
|
|
//
|
|
// Synopsis:
|
|
//
|
|
// Arguments:
|
|
//
|
|
// Returns:
|
|
//
|
|
// Modifies:
|
|
//
|
|
// History: 11-3-95 krishnag Created.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
WCHAR
|
|
CLexer::NextChar()
|
|
{
|
|
if (_ptr == NULL || *_ptr == L'\0') {
|
|
_dwEndofString = TRUE;
|
|
return(L'\0');
|
|
}
|
|
return(*_ptr++);
|
|
}
|
|
|
|
//+---------------------------------------------------------------------------
|
|
// Function:
|
|
//
|
|
// Synopsis:
|
|
//
|
|
// Arguments:
|
|
//
|
|
// Returns:
|
|
//
|
|
// Modifies:
|
|
//
|
|
// History: 11-3-95 krishnag Created.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
HRESULT
|
|
CLexer::PushBackToken()
|
|
{
|
|
if (_dwLastToken == TOKEN_END) {
|
|
RRETURN(S_OK);
|
|
}
|
|
_ptr -= _dwLastTokenLength;
|
|
|
|
RRETURN(S_OK);
|
|
}
|
|
|
|
|
|
//+---------------------------------------------------------------------------
|
|
// Function:
|
|
//
|
|
// Synopsis:
|
|
//
|
|
// Arguments:
|
|
//
|
|
// Returns:
|
|
//
|
|
// Modifies:
|
|
//
|
|
// History: 11-3-95 krishnag Created.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
void
|
|
CLexer::PushbackChar()
|
|
{
|
|
if (_dwEndofString) {
|
|
return;
|
|
}
|
|
_ptr--;
|
|
|
|
}
|
|
|
|
//+---------------------------------------------------------------------------
|
|
// Function:
|
|
//
|
|
// Synopsis:
|
|
//
|
|
// Arguments:
|
|
//
|
|
// Returns:
|
|
//
|
|
// Modifies:
|
|
//
|
|
// History: 11-3-95 krishnag Created.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
BOOL
|
|
CLexer::IsKeyword(LPWSTR szToken, LPDWORD pdwToken)
|
|
{
|
|
DWORD i = 0;
|
|
|
|
for (i = 0; i < MAX_KEYWORDS; i++) {
|
|
if (!_wcsicmp(szToken, KeywordList[i].Keyword)) {
|
|
*pdwToken = KeywordList[i].dwTokenId;
|
|
return(TRUE);
|
|
}
|
|
}
|
|
*pdwToken = 0;
|
|
return(FALSE);
|
|
}
|
|
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//Function:
|
|
//
|
|
//Synopsis:
|
|
//
|
|
//Arguments:
|
|
//
|
|
//Returns:
|
|
//
|
|
//Modifies:
|
|
//
|
|
//History: 11-3-95 krishnag Created.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
HRESULT
|
|
AddComponent(
|
|
POBJECTINFO pObjectInfo,
|
|
LPWSTR szComponent,
|
|
LPWSTR szValue,
|
|
LPWSTR szDisplayComponent,
|
|
LPWSTR szDisplayValue
|
|
)
|
|
{
|
|
if (!szComponent || !*szComponent || !szDisplayComponent || !*szDisplayComponent) {
|
|
RRETURN(E_FAIL);
|
|
}
|
|
|
|
if (pObjectInfo->NumComponents < MAXCOMPONENTS) {
|
|
|
|
pObjectInfo->ComponentArray[pObjectInfo->NumComponents].szComponent =
|
|
AllocADsStr(szComponent);
|
|
|
|
pObjectInfo->ComponentArray[pObjectInfo->NumComponents].szValue =
|
|
AllocADsStr(szValue);
|
|
|
|
pObjectInfo->DisplayComponentArray[pObjectInfo->NumComponents].szComponent =
|
|
AllocADsStr(szDisplayComponent);
|
|
|
|
pObjectInfo->DisplayComponentArray[pObjectInfo->NumComponents].szValue =
|
|
AllocADsStr(szDisplayValue);
|
|
|
|
pObjectInfo->NumComponents++;
|
|
|
|
RRETURN(S_OK);
|
|
|
|
}else {
|
|
RRETURN(E_ADS_BAD_PATHNAME);
|
|
}
|
|
}
|
|
|
|
HRESULT
|
|
AddProviderName(POBJECTINFO pObjectInfo, LPWSTR szToken)
|
|
{
|
|
if (!szToken || !*szToken) {
|
|
RRETURN(E_FAIL);
|
|
}
|
|
|
|
pObjectInfo->ProviderName = AllocADsStr(szToken);
|
|
|
|
RRETURN(S_OK);
|
|
}
|
|
|
|
|
|
HRESULT
|
|
AddTreeName(POBJECTINFO pObjectInfo, LPWSTR szToken, LPWSTR szDisplayToken)
|
|
{
|
|
if (!szToken || !*szToken || !szDisplayToken || !*szDisplayToken) {
|
|
RRETURN(E_FAIL);
|
|
}
|
|
|
|
pObjectInfo->TreeName = AllocADsStr(szToken);
|
|
pObjectInfo->DisplayTreeName = AllocADsStr(szDisplayToken);
|
|
|
|
RRETURN(S_OK);
|
|
}
|
|
|
|
|
|
//+---------------------------------------------------------------------------
|
|
// Function:
|
|
//
|
|
// Synopsis:
|
|
//
|
|
// Arguments:
|
|
//
|
|
// Returns:
|
|
//
|
|
// Modifies:
|
|
//
|
|
// History: 11-3-95 krishnag Created.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
HRESULT
|
|
SetType(POBJECTINFO pObjectInfo, DWORD dwToken)
|
|
{
|
|
pObjectInfo->ObjectType = dwToken;
|
|
RRETURN(S_OK);
|
|
}
|
|
|
|
|
|
// Type -> "user", "group","printer","service", "fileservice"
|
|
|
|
//+---------------------------------------------------------------------------
|
|
// Function: Type
|
|
//
|
|
// Synopsis: Parses Type-> "user" | "group" etc
|
|
//
|
|
// Arguments: [CLexer * pTokenizer]
|
|
// [POBJECTINFo pObjectInfo]
|
|
//
|
|
// Returns: HRESULT
|
|
//
|
|
// Modifies: -
|
|
//
|
|
// History: 11-3-95 krishnag Created.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
|
|
HRESULT
|
|
Type(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
|
|
{
|
|
WCHAR szToken[MAX_PATH];
|
|
DWORD dwToken;
|
|
HRESULT hr = E_FAIL;
|
|
|
|
hr = pTokenizer->GetNextToken(szToken, &dwToken);
|
|
BAIL_IF_ERROR(hr);
|
|
|
|
if (dwToken == TOKEN_IDENTIFIER ) {
|
|
if (pTokenizer->IsKeyword(szToken, &dwToken)) {
|
|
pObjectInfo->ClassName = AllocADsStr(szToken);
|
|
}
|
|
RRETURN(hr);
|
|
}
|
|
|
|
cleanup:
|
|
RRETURN(hr);
|
|
}
|
|
|
|
|
|
void
|
|
CLexer::SetAtDisabler(
|
|
BOOL bFlag
|
|
)
|
|
{
|
|
_bAtDisabled = bFlag;
|
|
}
|
|
|
|
BOOL
|
|
CLexer::GetAtDisabler()
|
|
{
|
|
return(_bAtDisabled);
|
|
}
|
|
|
|
|
|
|