From 5a35abb488703be30856caa45571ed2eb377d1c0 Mon Sep 17 00:00:00 2001 From: Gregory Nutt Date: Sun, 17 Jul 2016 08:31:02 -0600 Subject: [PATCH] Improve some comments --- libc/stdlib/lib_srand.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/libc/stdlib/lib_srand.c b/libc/stdlib/lib_srand.c index 8586afca11..0941fc8bd7 100644 --- a/libc/stdlib/lib_srand.c +++ b/libc/stdlib/lib_srand.c @@ -233,7 +233,7 @@ static double_t frand3(void) * Name: srand * * Description: - * Seed the confluent hypergeometric random number generator. + * Seed the congruential random number generator. * ****************************************************************************/ @@ -254,7 +254,7 @@ void srand(unsigned int seed) * Name: nrand * * Description: - * Return a random unsigned long value in the range of 0 to (limit - 1) + * Return a random, unsigned long value in the range of 0 to (limit - 1) * ****************************************************************************/ @@ -267,7 +267,7 @@ unsigned long nrand(unsigned long limit) do { - /* Get a random integer in the requested range */ + /* Get a random integer in the range 0.0 - 1.0 */ #if (CONFIG_LIB_RAND_ORDER == 1) ratio = frand1(); @@ -277,9 +277,13 @@ unsigned long nrand(unsigned long limit) ratio = frand3(); #endif - /* Then, produce the return-able value */ + /* Then, produce the return-able value in the requested range */ result = (unsigned long)(((double_t)limit) * ratio); + + /* Loop because there is a (unlikely) possibility that round could but + * the result at the limit value. + */ } while (result >= limit);