Wanted: random number generator written in C

[David Levine]

I am looking for a good public-domain pseudo-random number generator
written entirely in C.  Here's the catch: it has to run on Un*x
(Berkeley V7, version 4.1c) and be portable to a CP/M 2.2 system
(Software Toolworks' C compiler version 2.0, with considerable i/o
extensions to emulate stdio) with NO REALTIME CLOCK!  I figure the best
way to get pseudo-random numbers is to start with a 'seed' built into
the program, then store the last number generated on disk as a new
seed.  Obviously, deleting the file with this seed in it would cause
the program to start over with the original seed, but you can't have
everything.  Public-domain source, pointers to non-public-domain stuff
I can study, or just advice would be appreciated.

  -- David D. Levine   (...decvax!tektronix!tekecs!davidl)      [UUCP]
                       (...tekecs!davidl.tektronix at rand-relay)  [ARPA]