RANDLC is a C library which implements a version of the pseudorandom number generator used by the NAS Parallel Benchmarks.
The generator has the form
X(K+1) = A * X(K) mod 2^46where the suggested value of the multiplier A is 5^13 = 1220703125.
This scheme generates 2^44 numbers before repeating.
The web site for the NAS Parallel Benchmarks is http://www.nas.nasa.gov/Resources/Software/npb.html.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
RANDLC is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
ASA183, a C library which implements the Wichman-Hill pseudorandom number generator.
C_RANDOM, C programs which illustrate the use of C's random number generator routines.
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You can go up one level to the C source codes.