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| author | Vic (Chun-Ju) Yang <victoryang@chromium.org> | 2013-12-23 16:15:14 +0800 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2013-12-27 07:50:47 +0000 |
| commit | 4e7e33f6e7fe114ef94b5e068d723f621e54e5ab (patch) | |
| tree | 4110e0c2945e210d1f08967e426cce91a573c44b /common/test_util.c | |
| parent | 1b1d2e999c7349e896121abec9515270a76072f9 (diff) | |
| download | chrome-ec-4e7e33f6e7fe114ef94b5e068d723f621e54e5ab.tar.gz | |
Move pseudo random number generator to common
We have three copies of the same pseudo random number generator in our
test codes. Let's consolidate them into a single copy in test_util.
BUG=chrome-os-partner:19235
TEST=Pass all tests
BRANCH=None
Change-Id: I7ea0b3476f3cfe6944855f19861e3c86af35807e
Signed-off-by: Vic (Chun-Ju) Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/181085
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Diffstat (limited to 'common/test_util.c')
| -rw-r--r-- | common/test_util.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/common/test_util.c b/common/test_util.c index 58a6e5e05c..3b64b16fec 100644 --- a/common/test_util.c +++ b/common/test_util.c @@ -140,6 +140,18 @@ int test_send_host_command(int command, int version, const void *params, } #endif /* TASK_HAS_HOSTCMD */ +/* Linear congruential pseudo random number generator */ +uint32_t prng(uint32_t seed) +{ + return 22695477 * seed + 1; +} + +uint32_t prng_no_seed(void) +{ + static uint32_t seed = 0x1234abcd; + return seed = prng(seed); +} + static int command_run_test(int argc, char **argv) { run_test(); |