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I am looking for a software capable to refactor C code to make it more robust. In particular, tool must support detecting comparison against constants, such as numbers, macros or typedef enums.

For example: if (a == 'b') should be refactored to if ('b' == a)

Other cases:

typedef enum { ok, error } ab_t

if (func(x, y) == ok) //Refactor this...
if (ok == func(x, y)) //..to this

It would be also good to detect all unsigned types comparison against > 0, for example:

size_t i;
//...
if (i > 0)
//should be
if (i)

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