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divesite.c: use rand() instead of random()

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random() is POSIX and seems to be missing in MINGW.
it can return a 64bit (if 'long' is 64bit) but
given ID's are 32bit rand() should suffice.

also random() is technically a better algorithm but for
cryptographically unsafe usage like generating IDs the
stdlib's LCPRNG rand() should siffuce.

also this patch makes it so that a true 32bit random value
is returned. how random it is, is another topic.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Lubomir I. Ivanov 2015-02-14 16:16:03 +02:00 committed by Dirk Hohndel
parent 56de6b73f6
commit 0f2d0211c3
1 changed files with 6 additions and 2 deletions
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8
divesite.c
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@ -39,8 +39,12 @@ static uint32_t dive_site_getUniqId()
{ {
uint32_t id = 0; uint32_t id = 0;
while (id == 0 || get_dive_site_by_uuid(id)) while (id == 0 || get_dive_site_by_uuid(id)) {
id = random() + random(); id = rand() & 0xff;
id |= (rand() & 0xff) << 8;
id |= (rand() & 0xff) << 16;
id |= (rand() & 0xff) << 24;
}
return id; return id;
} }