clean up genalloc implementation #128
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mbhangui
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leahneukirchen
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schmonz
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May 18, 2020
This only moves the code blocks, but does not change any code at all.
Make sure calls to GEN_ALLOC_ready always follow GEN_ALLOC_readyplus.
Introduce an internal static helper function that does the common parts, which both functions can use.
While at it drop the register specification.
The names of the function parameters as well as the name of the local variable were taken from the macro arguments. Noone passed anything different than the default names there, and doing so doesn't make any sense anyway.
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Save the new length in a local variable, and only change the value in the struct if allocation succeeds instead of changing it back on failure.
This was doing 2 assignments, a function call and a return on the same line. This had the additional slight bug that if the allocation failed it returned 0, but the allocation length in the struct passed in was already changed to the new value. This would not do any harm on subsequent calls as the pointer was still NULL and only that is checked.
alloc() is used in the generated code, so directly include it in this header instead of all the callers.
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This code is best described as 90ies style function templates in C. This reduces the code duplication between the
*_readyplusand*_readyfunctions, which only differ slightly. Then the code is a bit de-obfuscated. I have used the additional unittest now in #102 to verify that things still behave the same.