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incubator-nuttx
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This commit is contained in:
Gregory Nutt 2016-07-17 08:31:02 -06:00
parent 07e20479ad
commit 5a35abb488
1 changed files with 8 additions and 4 deletions
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12
libc/stdlib/lib_srand.c
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@ -233,7 +233,7 @@ static double_t frand3(void)
* Name: srand * Name: srand
* *
* Description: * 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 * Name: nrand
* *
* Description: * 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 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) #if (CONFIG_LIB_RAND_ORDER == 1)
ratio = frand1(); ratio = frand1();
@ -277,9 +277,13 @@ unsigned long nrand(unsigned long limit)
ratio = frand3(); ratio = frand3();
#endif #endif
/* Then, produce the return-able value */ /* Then, produce the return-able value in the requested range */
result = (unsigned long)(((double_t)limit) * ratio); 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); while (result >= limit);