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Fix jerry-libc's srand function (#2068)

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The previous implementation of srand was wrong in jerry-libc.
It set all 4 values to the seed, not modifying anything in them, causing random values to be repeated pretty often.
This approach fixes the mentioned issue.

JerryScript-DCO-1.0-Signed-off-by: Daniel Balla dballa@inf.u-szeged.hu
This commit is contained in:
Daniel Balla 2017-11-06 11:31:22 +01:00 committed by Dániel Bátyai
parent 8ae659227e
commit 3de6c7ec7a
1 changed files with 8 additions and 4 deletions
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12
jerry-libc/jerry-libc.c
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@ -276,10 +276,14 @@ rand (void)
void
srand (unsigned int seed) /**< new seed */
{
libc_random_gen_state[0] =
libc_random_gen_state[1] =
libc_random_gen_state[2] =
libc_random_gen_state[3] = seed;
libc_random_gen_state[0] = (uint32_t) ((seed * 14316555781)
+ (seed * 1183186591)
+ (seed * 622729787)
+ (seed * 338294347));
libc_random_gen_state[1] = 842502087;
libc_random_gen_state[2] = 3579807591;
libc_random_gen_state[3] = 273326509;
} /* srand */
/**