lib/lib-test: restore DOVECOT_SRAND feature in DEBUG builds Add a deterministic PRNG, an ability to force its use, and an ability to re-use the same sequence later. Since proper random numbers have been forced into use, making reproducable tests isn't quite as easy as it used to be, it's 3 steps rather than 2. When seeing an intermittent test failure: - rerun the tests with environmental variable DOVECOT_SRAND=kiss - upon seeing a new failure case, note the seed logged at the failure - debug using DOVECOT_SRAND=<that number> In non-DEBUG builds, there's no trace of this code, and the randomisation that is an inherent part of many tests remains non-reproduceable. Works with all of the RNG preferences, getrandom/urandom/arc4. Signed-off-by: Phil Carmody <phil@dovecot.fi>

global: Replace random_fill_weak with random_fill They are now the same thing

lib: Use best available random number generator The best available method is used from short list of getrandom, arc4random or reading /dev/urandom

Changed .h ifdef/defines to use <NAME>_H format. --HG-- branch : HEAD

Added random_fill_weak() and make random_init() always initialize srand() with a seed from random_fill(). --HG-- branch : HEAD

size_t fixes for lib/. Changed OFF_T_FORMAT to PRIuOFF_T which is more C99-like. --HG-- branch : HEAD

removed const attribute from buffer argument for random_fill(), that really shouldn't have been there.. --HG-- branch : HEAD

Initial revision --HG-- branch : HEAD