author | Peter Fordham <peter.fordham@gmail.com> |
Mon, 22 Mar 2010 12:54:15 -0700 | |
branch | CompilerCompatibility |
changeset 11 | 8d1ef0d13f16 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
0
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// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// Abstraction for "an environment" holding pairs of C strings (name, value) |
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// |
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// |
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|
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#include "ENVIRON.H" |
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#include "LPOSIX.H" |
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#include <string.h> |
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|
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TPtrC16 TEnvVar::ValuePtr(const wchar_t* aValue) |
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// |
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// Turn a zero-terminated string into a descriptor which contains the terminator |
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// |
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{ |
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TText16* value = (TText16*)aValue; |
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return TPtrC16(value, User::StringLength(value)+1); |
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} |
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|
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void TEnvVar::ConstructL(const TDesC16& aName, const wchar_t* aValue) |
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{ |
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TPtrC16 valueZ = ValuePtr(aValue); |
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HBufC16* valueCopy = valueZ.AllocLC(); |
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iName = aName.AllocL(); |
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iValue = valueCopy; |
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CleanupStack::Pop(); |
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} |
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|
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void TEnvVar::Release() |
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{ |
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delete iName; |
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iName=0; |
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delete iValue; |
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iValue=0; |
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} |
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|
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TInt TEnvVar::SetValue(const wchar_t* aValue) |
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// |
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// Change the value - if this returns an error then the original value is still intact |
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// |
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{ |
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TPtrC16 valueZ = ValuePtr(aValue); |
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HBufC16* valueCopy=valueZ.Alloc(); |
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if (valueCopy==0) |
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return KErrNoMemory; |
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delete iValue; |
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iValue = valueCopy; |
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return KErrNone; |
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} |
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|
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|
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HBufC16* TEnvVar::Match(const TDesC16& aName) |
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// |
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// return value if the name matches |
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// |
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{ |
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if (iName!=0 && iName->Compare(aName)==0) |
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return iValue; |
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return 0; |
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} |
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TUint TEnvVar::Length() const |
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// |
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// How much space do we need to externalize this pair? |
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// The format is name followed by '\0' followed by value followed by '\0' |
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// |
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{ |
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if (iName==0) |
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return 0; |
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return iName->Length()+iValue->Length()+2; |
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} |
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|
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TInt TEnvVar::Externalize(const wchar_t* aPair, TDes16& aBuffer) |
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// |
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// static function to externalize a "name=value" definition |
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// |
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{ |
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const wchar_t* cp=aPair; |
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for (cp=aPair; *cp; ++cp) |
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{ |
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if (*cp==L'=') |
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break; |
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} |
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if (*cp!=L'=') |
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return 0; // malformed |
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|
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TPtrC16 name((TText16*)aPair,cp-aPair); |
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TPtrC16 value((TText16*)(cp+1)); |
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aBuffer.Append(name); |
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aBuffer.Append(TChar(0)); |
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aBuffer.Append(value); |
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aBuffer.Append(TChar(0)); |
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return 1; |
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} |
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106 |
|
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TInt TEnvVar::Externalize(TDes16& aBuffer) |
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108 |
{ |
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if (iName==0) |
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return 0; |
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aBuffer.Append(*iName); |
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aBuffer.Append(TChar(0)); |
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aBuffer.Append(*iValue); |
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aBuffer.Append(TChar(0)); |
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return 1; |
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} |
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117 |
|
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void TEnvVar::ConstructL(const TText16*& aPtr) |
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119 |
{ |
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TPtrC16 name(aPtr); |
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aPtr+=name.Length()+1; |
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ConstructL(name,(const wchar_t*)aPtr); |
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aPtr+=iValue->Length()+1; |
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} |
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125 |
|
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CEnvironment::~CEnvironment() |
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127 |
{ |
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while (iCount>0) |
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129 |
{ |
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--iCount; |
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iVars[iCount].Release(); |
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} |
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User::Free(iVars); |
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} |
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135 |
|
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136 |
|
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void CEnvironment::ConstructL(TUint aCount, TDes16& aBuffer) |
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// |
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// Set up the environment from a descriptor. If this leaves then |
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// the CEnvironment destructor will be able to clean up properly. |
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141 |
// |
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142 |
{ |
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// always allocate at least one slot - makes life easier elsewhere |
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TInt bytes = (aCount+1)*sizeof(TEnvVar); |
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iVars=(TEnvVar*) User::AllocL(bytes); |
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Mem::FillZ(iVars,bytes); |
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iCount=aCount+1; |
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148 |
|
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const TText16* data=aBuffer.Ptr(); |
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for (TUint i=0; i<aCount; ++i) |
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iVars[i].ConstructL(data); |
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152 |
} |
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153 |
|
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154 |
HBufC16* CEnvironment::ExternalizeLC(TUint& aCount, wchar_t** envp) |
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155 |
{ |
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if (envp==0) |
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return ExternalizeLC(aCount); // get current environment |
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// Externalize supplied environment |
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TInt length=0; |
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wchar_t** ep=envp; |
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for (ep=envp; *ep; ++ep) |
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length+=wcslen(*ep)+1; |
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HBufC16* retBuf = HBufC16::NewLC(length); |
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TInt nvars=0; |
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TPtr16 hbuf16=retBuf->Des(); |
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for (ep=envp; *ep; ++ep) |
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nvars+=TEnvVar::Externalize(*ep, hbuf16); |
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aCount=nvars; |
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169 |
return retBuf; |
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170 |
} |
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171 |
|
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172 |
HBufC16* CEnvironment::ExternalizeLC(TUint& aCount) |
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173 |
{ |
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TInt length=0; |
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TUint i=0; |
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for (i=0; i<iCount; ++i) |
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length+=iVars[i].Length(); |
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HBufC16* retBuf = HBufC16::NewLC(length); |
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179 |
TInt nvars=0; |
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TPtr16 hbuf16=retBuf->Des(); |
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181 |
for (i=0; i<iCount; i++) |
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182 |
nvars+=iVars[i].Externalize(hbuf16); |
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183 |
aCount=nvars; |
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184 |
return retBuf; |
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185 |
} |
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186 |
|
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187 |
// The interface used to support the STDLIB routines |
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188 |
|
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189 |
wchar_t * CEnvironment::getenv(const wchar_t* aName) const |
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190 |
{ |
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191 |
TPtrC16 name((TText16*)aName); |
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192 |
for (TUint i=0; i<iCount; ++i) |
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193 |
{ |
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194 |
HBufC16* value=iVars[i].Match(name); |
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if (value) |
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196 |
{ |
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const wchar_t* vptr = (const wchar_t*)(value->Ptr()); |
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return CONST_CAST(wchar_t*,vptr); // I hope nobody modifies this data... |
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199 |
} |
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200 |
} |
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201 |
return 0; |
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202 |
} |
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203 |
|
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204 |
int CEnvironment::setenv(const wchar_t* aName, const wchar_t* aValue, int aReplace, int& anErrno) |
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205 |
{ |
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206 |
TPtrC16 name((TText16*)aName); |
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207 |
TUint freeSlot=iCount; |
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208 |
TEnvVar* ep=iVars; |
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209 |
for (TUint i=0; i<iCount; ++i,++ep) |
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210 |
{ |
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if (ep->NotEmpty()) |
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{ |
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const TDesC16* existing=ep->Match(name); |
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if (existing) |
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{ |
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TInt err=KErrNone; |
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if (aReplace) |
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ep->SetValue(aValue); |
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return MapError(err,anErrno); |
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} |
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} |
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else |
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freeSlot=i; |
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} |
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if (freeSlot==iCount) |
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{ |
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// no free slots, time to grow the array |
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ep=(TEnvVar*)User::ReAlloc(iVars,(iCount+1)*sizeof(TEnvVar)); |
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if (ep==0) |
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return KErrNoMemory; |
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iVars=ep; |
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++iCount; |
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} |
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TRAPD(ret,iVars[freeSlot].ConstructL(name,aValue)); |
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return MapError(ret,anErrno); |
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} |
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|
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void CEnvironment::unsetenv(const wchar_t* aName) |
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{ |
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TPtrC16 name((TText16*)aName); |
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for (TUint i=0; i<iCount; ++i) |
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{ |
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const TDesC16* value=iVars[i].Match(name); |
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if (value) |
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{ |
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iVars[i].Release(); |
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return; |
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} |
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} |
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} |
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251 |