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Some cleanups

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This commit is contained in:
Dale Weiler 2013-10-11 09:32:46 -04:00
parent ccb46d7e3b
commit f008cc257d
3 changed files with 35 additions and 11 deletions
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1
ftepp.c
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@ -23,7 +23,6 @@
*/
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <sys/stat.h>
#include "gmqcc.h"

2
main.c
View file

@ -21,8 +21,6 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

43
util.c
View file

@ -22,10 +22,6 @@
* SOFTWARE.
*/
#define GMQCC_PLATFORM_HEADER
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include "gmqcc.h"
#include "platform.h"
@ -286,9 +282,40 @@ bool util_isatty(fs_file_t *file) {
return false;
}
void util_seed(uint32_t value) {
srand((int)value);
}
/*
* A small noncryptographic PRNG based on:
* http://burtleburtle.net/bob/rand/smallprng.html
*/
static uint32_t util_rand_state[4] = {
0xF1EA5EED, 0x00000000,
0x00000000, 0x00000000
};
#define util_rand_rot(X, Y) (((X)<<(Y))|((X)>>(32-(Y))))
uint32_t util_rand() {
return rand();
uint32_t last;
last = util_rand_state[0] - util_rand_rot(util_rand_state[1], 27);
util_rand_state[0] = util_rand_state[1] ^ util_rand_rot(util_rand_state[2], 17);
util_rand_state[1] = util_rand_state[2] + util_rand_state[3];
util_rand_state[2] = util_rand_state[3] + last;
util_rand_state[3] = util_rand_state[0] + last;
return util_rand_state[3];
}
#undef util_rand_rot
void util_seed(uint32_t value) {
size_t i;
util_rand_state[0] = 0xF1EA5EED;
util_rand_state[1] = value;
util_rand_state[2] = value;
util_rand_state[3] = value;
for (i = 0; i < 20; ++i)
(void)util_rand();
}