Implement rand_r(), strnlen_s(), tempnam(), tmpnam()

The RNG for rand_r() is pretty weak, but if you're using rand_r() you probably aren't looking for robust RNG anyway.

tempnam() and tmpnam() just use mktemp() to generate file names.

BTW I just noticed rand() (and now rand_r() because the generation code is the same) uses gen_range(), which excludes the high number, so RAND_MAX will never be generated.

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• 67af78d0 - stdlib: make rand()/rand_r() generate from [0, RAND_MAX]

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The issue I mentioned should no longer be a problem.

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• 173abfb0 - string: add strlen_s()

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• 5bbce377 - string: add strnlen_s()

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• 3584edf1 - stdio: implement tempnam() and tmpnam()

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• 68d3c5f1 - Format code

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changed title from stdlib: implement rand_r() using XorShiftRng to Implement rand_r(), strnlen_s(), tempnam(), tmpnam()

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merged

mentioned in commit be765f87