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This is a simple MT19937 random number generator. The code is straightforward conversion of the Mersenne Twister pseudocode published on the Wikipedia page into C (1989 standard).

The generator is initialized by the ms_init function. After this, 32-bit pseudorandom numbers can be generated by calling ms_rand(). If the user doesn't call ms_init prior to the first call to ms_rand(), the generator is seeded to the system time (unless lines 6 and 7 are commented out, in which case, you'd better seed the generator with something or you'll get all zeroes). The main function included in this code is a very simple demo that counts instances of generated pseudorandom numbers between 0 and 19 and prints the counts.