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1 // Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // Abstraction for "an environment" holding pairs of C strings (name, value) |
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15 // |
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16 // |
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17 |
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18 #include "ENVIRON.H" |
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19 #include "LPOSIX.H" |
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20 #include <string.h> |
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21 |
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22 TPtrC16 TEnvVar::ValuePtr(const wchar_t* aValue) |
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23 // |
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24 // Turn a zero-terminated string into a descriptor which contains the terminator |
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25 // |
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26 { |
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27 TText16* value = (TText16*)aValue; |
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28 return TPtrC16(value, User::StringLength(value)+1); |
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29 } |
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30 |
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31 void TEnvVar::ConstructL(const TDesC16& aName, const wchar_t* aValue) |
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32 { |
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33 TPtrC16 valueZ = ValuePtr(aValue); |
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34 HBufC16* valueCopy = valueZ.AllocLC(); |
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35 iName = aName.AllocL(); |
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36 iValue = valueCopy; |
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37 CleanupStack::Pop(); |
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38 } |
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39 |
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40 void TEnvVar::Release() |
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41 { |
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42 delete iName; |
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43 iName=0; |
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44 delete iValue; |
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45 iValue=0; |
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46 } |
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47 |
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48 TInt TEnvVar::SetValue(const wchar_t* aValue) |
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49 // |
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50 // Change the value - if this returns an error then the original value is still intact |
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51 // |
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52 { |
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53 TPtrC16 valueZ = ValuePtr(aValue); |
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54 HBufC16* valueCopy=valueZ.Alloc(); |
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55 if (valueCopy==0) |
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56 return KErrNoMemory; |
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57 delete iValue; |
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58 iValue = valueCopy; |
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59 return KErrNone; |
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60 } |
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61 |
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62 |
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63 HBufC16* TEnvVar::Match(const TDesC16& aName) |
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64 // |
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65 // return value if the name matches |
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66 // |
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67 { |
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68 if (iName!=0 && iName->Compare(aName)==0) |
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69 return iValue; |
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70 return 0; |
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71 } |
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72 |
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73 TUint TEnvVar::Length() const |
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74 // |
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75 // How much space do we need to externalize this pair? |
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76 // The format is name followed by '\0' followed by value followed by '\0' |
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77 // |
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78 { |
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79 if (iName==0) |
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80 return 0; |
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81 return iName->Length()+iValue->Length()+2; |
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82 } |
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83 |
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84 TInt TEnvVar::Externalize(const wchar_t* aPair, TDes16& aBuffer) |
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85 // |
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86 // static function to externalize a "name=value" definition |
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87 // |
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88 { |
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89 const wchar_t* cp=aPair; |
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90 for (cp=aPair; *cp; ++cp) |
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91 { |
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92 if (*cp==L'=') |
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93 break; |
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94 } |
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95 if (*cp!=L'=') |
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96 return 0; // malformed |
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97 |
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98 TPtrC16 name((TText16*)aPair,cp-aPair); |
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99 TPtrC16 value((TText16*)(cp+1)); |
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100 aBuffer.Append(name); |
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101 aBuffer.Append(TChar(0)); |
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102 aBuffer.Append(value); |
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103 aBuffer.Append(TChar(0)); |
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104 return 1; |
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105 } |
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106 |
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107 TInt TEnvVar::Externalize(TDes16& aBuffer) |
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108 { |
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109 if (iName==0) |
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110 return 0; |
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111 aBuffer.Append(*iName); |
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112 aBuffer.Append(TChar(0)); |
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113 aBuffer.Append(*iValue); |
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114 aBuffer.Append(TChar(0)); |
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115 return 1; |
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116 } |
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117 |
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118 void TEnvVar::ConstructL(const TText16*& aPtr) |
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119 { |
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120 TPtrC16 name(aPtr); |
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121 aPtr+=name.Length()+1; |
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122 ConstructL(name,(const wchar_t*)aPtr); |
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123 aPtr+=iValue->Length()+1; |
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124 } |
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125 |
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126 CEnvironment::~CEnvironment() |
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127 { |
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128 while (iCount>0) |
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129 { |
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130 --iCount; |
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131 iVars[iCount].Release(); |
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132 } |
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133 User::Free(iVars); |
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134 } |
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135 |
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136 |
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137 void CEnvironment::ConstructL(TUint aCount, TDes16& aBuffer) |
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138 // |
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139 // Set up the environment from a descriptor. If this leaves then |
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140 // the CEnvironment destructor will be able to clean up properly. |
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141 // |
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142 { |
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143 // always allocate at least one slot - makes life easier elsewhere |
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144 TInt bytes = (aCount+1)*sizeof(TEnvVar); |
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145 iVars=(TEnvVar*) User::AllocL(bytes); |
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146 Mem::FillZ(iVars,bytes); |
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147 iCount=aCount+1; |
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148 |
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149 const TText16* data=aBuffer.Ptr(); |
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150 for (TUint i=0; i<aCount; ++i) |
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151 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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156 if (envp==0) |
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157 return ExternalizeLC(aCount); // get current environment |
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158 // Externalize supplied environment |
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159 TInt length=0; |
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160 wchar_t** ep=envp; |
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161 for (ep=envp; *ep; ++ep) |
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162 length+=wcslen(*ep)+1; |
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163 HBufC16* retBuf = HBufC16::NewLC(length); |
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164 TInt nvars=0; |
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165 TPtr16 hbuf16=retBuf->Des(); |
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166 for (ep=envp; *ep; ++ep) |
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167 nvars+=TEnvVar::Externalize(*ep, hbuf16); |
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168 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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174 TInt length=0; |
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175 TUint i=0; |
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176 for (i=0; i<iCount; ++i) |
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177 length+=iVars[i].Length(); |
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178 HBufC16* retBuf = HBufC16::NewLC(length); |
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179 TInt nvars=0; |
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180 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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195 if (value) |
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196 { |
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197 const wchar_t* vptr = (const wchar_t*)(value->Ptr()); |
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198 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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211 if (ep->NotEmpty()) |
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212 { |
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213 const TDesC16* existing=ep->Match(name); |
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214 if (existing) |
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215 { |
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216 TInt err=KErrNone; |
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217 if (aReplace) |
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218 ep->SetValue(aValue); |
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219 return MapError(err,anErrno); |
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220 } |
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221 } |
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222 else |
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223 freeSlot=i; |
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224 } |
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225 if (freeSlot==iCount) |
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226 { |
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227 // no free slots, time to grow the array |
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228 ep=(TEnvVar*)User::ReAlloc(iVars,(iCount+1)*sizeof(TEnvVar)); |
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229 if (ep==0) |
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230 return KErrNoMemory; |
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231 iVars=ep; |
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232 ++iCount; |
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233 } |
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234 TRAPD(ret,iVars[freeSlot].ConstructL(name,aValue)); |
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235 return MapError(ret,anErrno); |
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236 } |
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237 |
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238 void CEnvironment::unsetenv(const wchar_t* aName) |
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239 { |
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240 TPtrC16 name((TText16*)aName); |
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241 for (TUint i=0; i<iCount; ++i) |
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242 { |
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243 const TDesC16* value=iVars[i].Match(name); |
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244 if (value) |
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245 { |
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246 iVars[i].Release(); |
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247 return; |
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248 } |
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249 } |
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250 } |
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251 |