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<pre><a name="line-1"></a><span class='hs-comment'>{-|
<a name="line-2"></a>-}</span>
<a name="line-3"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>DB</span><span class='hs-varop'>.</span><span class='hs-conid'>HSQL</span><span class='hs-varop'>.</span><span class='hs-conid'>PG</span><span class='hs-varop'>.</span><span class='hs-conid'>Core</span> <span class='hs-keyword'>where</span>
<a name="line-4"></a>
<a name="line-5"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Database</span><span class='hs-varop'>.</span><span class='hs-conid'>HSQL</span> <span class='hs-varid'>hiding</span><span class='hs-layout'>(</span><span class='hs-varid'>fetch</span><span class='hs-layout'>,</span><span class='hs-varid'>describe</span><span class='hs-layout'>,</span><span class='hs-varid'>query</span><span class='hs-layout'>,</span><span class='hs-varid'>execute</span><span class='hs-layout'>)</span>
<a name="line-6"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Database</span><span class='hs-varop'>.</span><span class='hs-conid'>HSQL</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span><span class='hs-layout'>(</span><span class='hs-conid'>Statement</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-7"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-layout'>(</span><span class='hs-varid'>nullPtr</span><span class='hs-layout'>)</span>
<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-conid'>CString</span><span class='hs-layout'>,</span><span class='hs-varid'>newCString</span><span class='hs-layout'>,</span><span class='hs-varid'>peekCString</span><span class='hs-layout'>,</span><span class='hs-varid'>withCString</span><span class='hs-layout'>)</span>
<a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span><span class='hs-varid'>throw</span><span class='hs-layout'>)</span>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-layout'>(</span><span class='hs-varid'>when</span><span class='hs-layout'>,</span><span class='hs-varid'>unless</span><span class='hs-layout'>)</span>
<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Concurrent</span><span class='hs-varop'>.</span><span class='hs-conid'>MVar</span><span class='hs-layout'>(</span><span class='hs-conid'>MVar</span><span class='hs-layout'>,</span><span class='hs-varid'>newMVar</span><span class='hs-layout'>,</span><span class='hs-varid'>modifyMVar</span><span class='hs-layout'>,</span><span class='hs-varid'>readMVar</span><span class='hs-layout'>)</span>
<a name="line-12"></a>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>DB</span><span class='hs-varop'>.</span><span class='hs-conid'>HSQL</span><span class='hs-varop'>.</span><span class='hs-conid'>PG</span><span class='hs-varop'>.</span><span class='hs-conid'>Functions</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>DB</span><span class='hs-varop'>.</span><span class='hs-conid'>HSQL</span><span class='hs-varop'>.</span><span class='hs-conid'>PG</span><span class='hs-varop'>.</span><span class='hs-conid'>Type</span><span class='hs-layout'>(</span><span class='hs-varid'>mkSqlType</span><span class='hs-layout'>)</span>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>DB</span><span class='hs-varop'>.</span><span class='hs-conid'>HSQL</span><span class='hs-varop'>.</span><span class='hs-conid'>PG</span><span class='hs-varop'>.</span><span class='hs-conid'>Status</span><span class='hs-layout'>(</span><span class='hs-varid'>pgTuplesOk</span><span class='hs-layout'>,</span><span class='hs-varid'>pgCommandOk</span><span class='hs-layout'>,</span><span class='hs-varid'>pgFatalError</span><span class='hs-layout'>)</span>
<a name="line-16"></a>
<a name="line-17"></a>
<a name="line-18"></a><a name="execute"></a><span class='hs-comment'>-- |</span>
<a name="line-19"></a><span class='hs-definition'>execute</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PGconn</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-20"></a><span class='hs-definition'>execute</span> <span class='hs-varid'>pConn</span> <span class='hs-varid'>sqlExpr</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-21"></a> <span class='hs-varid'>pRes</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>withCString</span> <span class='hs-varid'>sqlExpr</span> <span class='hs-layout'>(</span><span class='hs-varid'>pqExec</span> <span class='hs-varid'>pConn</span><span class='hs-layout'>)</span>
<a name="line-22"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>pRes</span><span class='hs-varop'>==</span><span class='hs-varid'>nullPtr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span>
<a name="line-23"></a> <span class='hs-varid'>errMsg</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pqErrorMessage</span> <span class='hs-varid'>pConn</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>peekCString</span>
<a name="line-24"></a> <span class='hs-varid'>throw</span> <span class='hs-layout'>(</span><span class='hs-conid'>SqlError</span> <span class='hs-layout'>{</span> <span class='hs-varid'>seState</span><span class='hs-keyglyph'>=</span><span class='hs-str'>"E"</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>seNativeError</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>pgFatalError</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>seErrorMsg</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>errMsg</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-27"></a> <span class='hs-varid'>status</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pqResultStatus</span> <span class='hs-varid'>pRes</span>
<a name="line-28"></a> <span class='hs-varid'>unless</span> <span class='hs-layout'>(</span><span class='hs-varid'>status</span> <span class='hs-varop'>==</span> <span class='hs-varid'>pgCommandOk</span> <span class='hs-varop'>||</span> <span class='hs-varid'>status</span> <span class='hs-varop'>==</span> <span class='hs-varid'>pgTuplesOk</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span>
<a name="line-29"></a> <span class='hs-varid'>errMsg</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pqResultErrorMessage</span> <span class='hs-varid'>pRes</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>peekCString</span>
<a name="line-30"></a> <span class='hs-varid'>throw</span> <span class='hs-layout'>(</span><span class='hs-conid'>SqlError</span> <span class='hs-layout'>{</span> <span class='hs-varid'>seState</span><span class='hs-keyglyph'>=</span><span class='hs-str'>"E"</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>seNativeError</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>status</span>
<a name="line-32"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>seErrorMsg</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>errMsg</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-33"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-34"></a>
<a name="line-35"></a><a name="query"></a><span class='hs-comment'>-- |</span>
<a name="line-36"></a><span class='hs-definition'>query</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Connection</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PGconn</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Statement</span>
<a name="line-37"></a><span class='hs-definition'>query</span> <span class='hs-varid'>conn</span> <span class='hs-varid'>pConn</span> <span class='hs-varid'>query</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-38"></a> <span class='hs-varid'>pRes</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>withCString</span> <span class='hs-varid'>query</span> <span class='hs-layout'>(</span><span class='hs-varid'>pqExec</span> <span class='hs-varid'>pConn</span><span class='hs-layout'>)</span>
<a name="line-39"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>pRes</span><span class='hs-varop'>==</span><span class='hs-varid'>nullPtr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span>
<a name="line-40"></a> <span class='hs-varid'>errMsg</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pqErrorMessage</span> <span class='hs-varid'>pConn</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>peekCString</span>
<a name="line-41"></a> <span class='hs-varid'>throw</span> <span class='hs-layout'>(</span><span class='hs-conid'>SqlError</span> <span class='hs-layout'>{</span> <span class='hs-varid'>seState</span><span class='hs-keyglyph'>=</span><span class='hs-str'>"E"</span>
<a name="line-42"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>seNativeError</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>pgFatalError</span>
<a name="line-43"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>seErrorMsg</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>errMsg</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-44"></a> <span class='hs-varid'>status</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pqResultStatus</span> <span class='hs-varid'>pRes</span>
<a name="line-45"></a> <span class='hs-varid'>unless</span> <span class='hs-layout'>(</span><span class='hs-varid'>status</span> <span class='hs-varop'>==</span> <span class='hs-varid'>pgCommandOk</span> <span class='hs-varop'>||</span> <span class='hs-varid'>status</span> <span class='hs-varop'>==</span> <span class='hs-varid'>pgTuplesOk</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span>
<a name="line-46"></a> <span class='hs-varid'>errMsg</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pqResultErrorMessage</span> <span class='hs-varid'>pRes</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>peekCString</span>
<a name="line-47"></a> <span class='hs-varid'>throw</span> <span class='hs-layout'>(</span><span class='hs-conid'>SqlError</span> <span class='hs-layout'>{</span> <span class='hs-varid'>seState</span><span class='hs-keyglyph'>=</span><span class='hs-str'>"E"</span>
<a name="line-48"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>seNativeError</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>status</span>
<a name="line-49"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>seErrorMsg</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>errMsg</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-50"></a> <span class='hs-varid'>defs</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>status</span> <span class='hs-varop'>==</span> <span class='hs-varid'>pgTuplesOk</span>
<a name="line-51"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>pgNFields</span> <span class='hs-varid'>pRes</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>getFieldDefs</span> <span class='hs-varid'>pRes</span> <span class='hs-num'>0</span>
<a name="line-52"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-53"></a> <span class='hs-varid'>countTuples</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pqNTuples</span> <span class='hs-varid'>pRes</span><span class='hs-layout'>;</span>
<a name="line-54"></a> <span class='hs-varid'>tupleIndex</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newMVar</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-55"></a> <span class='hs-varid'>refFalse</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newMVar</span> <span class='hs-conid'>False</span>
<a name="line-56"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Statement</span> <span class='hs-layout'>{</span> <span class='hs-varid'>stmtConn</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>conn</span>
<a name="line-57"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stmtClose</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-58"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stmtFetch</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fetch</span> <span class='hs-varid'>tupleIndex</span> <span class='hs-varid'>countTuples</span>
<a name="line-59"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stmtGetCol</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getColValue</span> <span class='hs-varid'>pRes</span> <span class='hs-varid'>tupleIndex</span> <span class='hs-varid'>countTuples</span>
<a name="line-60"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stmtFields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defs</span>
<a name="line-61"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stmtClosed</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>refFalse</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span>
<a name="line-62"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>getFieldDefs</span> <span class='hs-varid'>pRes</span> <span class='hs-varid'>i</span> <span class='hs-varid'>n</span>
<a name="line-63"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-64"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-65"></a> <span class='hs-varid'>name</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pgFName</span> <span class='hs-varid'>pRes</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>peekCString</span>
<a name="line-66"></a> <span class='hs-varid'>dataType</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pqFType</span> <span class='hs-varid'>pRes</span> <span class='hs-varid'>i</span>
<a name="line-67"></a> <span class='hs-varid'>modifier</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pqFMod</span> <span class='hs-varid'>pRes</span> <span class='hs-varid'>i</span>
<a name="line-68"></a> <span class='hs-varid'>defs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getFieldDefs</span> <span class='hs-varid'>pRes</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>n</span>
<a name="line-69"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>name</span><span class='hs-layout'>,</span><span class='hs-varid'>mkSqlType</span> <span class='hs-varid'>dataType</span> <span class='hs-varid'>modifier</span><span class='hs-layout'>,</span><span class='hs-conid'>True</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>defs</span><span class='hs-layout'>)</span>
<a name="line-70"></a>
<a name="line-71"></a>
<a name="line-72"></a><a name="fetch"></a><span class='hs-comment'>-- |</span>
<a name="line-73"></a><span class='hs-definition'>fetch</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MVar</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
<a name="line-74"></a><span class='hs-definition'>fetch</span> <span class='hs-varid'>tupleIndex</span> <span class='hs-varid'>countTuples</span> <span class='hs-keyglyph'>=</span>
<a name="line-75"></a> <span class='hs-varid'>modifyMVar</span> <span class='hs-varid'>tupleIndex</span>
<a name="line-76"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>index</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>index</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>,</span><span class='hs-varid'>index</span> <span class='hs-varop'><</span> <span class='hs-varid'>countTuples</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-77"></a>
<a name="line-78"></a><a name="getColValue"></a><span class='hs-comment'>-- |</span>
<a name="line-79"></a><span class='hs-definition'>getColValue</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PGresult</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MVar</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FieldDef</span>
<a name="line-80"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>FieldDef</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CString</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-81"></a><span class='hs-definition'>getColValue</span> <span class='hs-varid'>pRes</span> <span class='hs-varid'>tupleIndex</span> <span class='hs-varid'>countTuples</span> <span class='hs-varid'>colNumber</span> <span class='hs-varid'>fieldDef</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-82"></a> <span class='hs-varid'>index</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readMVar</span> <span class='hs-varid'>tupleIndex</span>
<a name="line-83"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>index</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>countTuples</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>throw</span> <span class='hs-conid'>SqlNoData</span><span class='hs-layout'>)</span>
<a name="line-84"></a> <span class='hs-varid'>isnull</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pqGetisnull</span> <span class='hs-varid'>pRes</span> <span class='hs-varid'>index</span> <span class='hs-varid'>colNumber</span>
<a name="line-85"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>isnull</span> <span class='hs-varop'>==</span> <span class='hs-num'>1</span>
<a name="line-86"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>f</span> <span class='hs-varid'>fieldDef</span> <span class='hs-varid'>nullPtr</span> <span class='hs-num'>0</span>
<a name="line-87"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>pStr</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pqGetvalue</span> <span class='hs-varid'>pRes</span> <span class='hs-varid'>index</span> <span class='hs-varid'>colNumber</span>
<a name="line-88"></a> <span class='hs-varid'>strLen</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>strlen</span> <span class='hs-varid'>pStr</span>
<a name="line-89"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>fieldDef</span> <span class='hs-varid'>pStr</span> <span class='hs-varid'>strLen</span>
<a name="line-90"></a>
<a name="line-91"></a>
<a name="line-92"></a><a name="newCStringElseNullPtr"></a><span class='hs-comment'>-- | Convert string by newCString, if provided, else return of nullPtr</span>
<a name="line-93"></a><span class='hs-definition'>newCStringElseNullPtr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>CString</span>
<a name="line-94"></a><span class='hs-definition'>newCStringElseNullPtr</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>=</span>
<a name="line-95"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>nullPtr</span>
<a name="line-96"></a><span class='hs-definition'>newCStringElseNullPtr</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>string</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-97"></a> <span class='hs-varid'>newCString</span> <span class='hs-varid'>string</span>
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