implementation of rand()

Question

I am writing some embedded code in C and need to use the rand() function. Unfortunately, rand() is not supported in the library for the controller. I need a simple implement

Answer 1

I'd take one from the GNU C library, the source is available to browse online.

http://qa.coreboot.org/docs/libpayload/rand_8c-source.html

But if you have any concern at all about the quality of the random numbers, you should probably look at more carefully written mathematically libraries. It's a big subject and the standard rand implementations aren't highly thought of by experts.

Here's another possibility: http://www.boost.org/doc/libs/1_39_0/libs/random/index.html

(If you find you have too many options, you could always pick one at random.)