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POHow to assert/test when uninitialised memory is passed to function
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  1. POHow to assert/test when uninitialised memory is passed to function
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    copied!<p>I have a situation where a part of my code has been found to be passed uninitialized memory at times. I am looking for a way in which I could assert when this case occurs when running with the debug-heap. This is a function that could be thrown about in places for that extra help in tracking bugs:</p> <pre><code>void foo( char* data, int dataBytes ) { assert( !hasUninitialisedData(data,dataBytes) ); //, This is what we would like ... } </code></pre> <p>I have seen that there are tools like valgrind and as I run on windows there is DrMemory. These however run external to the application so don't find the issue when it occurs for the developer. More importantly these throw up thousands of reports for Qt and other irrelevant functions making things impossible.</p> <p>I think the idea is to have a function that would search for the 0xBAADFOOD within the array but there are a whole series of potential hex values and these change per platform. These hex values may also sometimes be valid when integers are stored so not sure if there is more information that can be obtained form the debug-heap.</p> <p>I am primarily interested the potential there could be a CRT function, library, visual-studio breakpoint, or other helper function for doing this sort of check. It 'feels' like there should be one somewhere already, I couldn't find it yet so if anybody has some nice solutions for this sort of situation it would be appreciated.</p> <p>EDIT: I should explain better, I know the debug-heap will initialize all allocations with a value in attempt to allow detecting uninitialised data. As mentioned the data being received contains some 0xBAADFOOD values, normally memory is initialized with 0xCDCDCDCD but this is a third party library allocating the data and apparently there are multiple magic numbers hence I am interested if there is a generalized check hidden somewhere.</p>
 

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