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util.crand: Use a small buffer on the stack for small pieces of random, should be faster

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This commit is contained in:
Kim Alvefur 2017-12-03 15:03:25 +01:00
parent af554a9feb
commit da570eb0a4
1 changed files with 11 additions and 1 deletions
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12
util-src/crand.c
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@ -58,9 +58,19 @@ int getrandom(void *buf, size_t buflen, unsigned int flags) {
#error util.crand compiled without a random source
#endif
#ifndef SMALLBUFSIZ
#define SMALLBUFSIZ 32
#endif
int Lrandom(lua_State *L) {
char smallbuf[SMALLBUFSIZ];
char *buf = &smallbuf[0];
const size_t len = luaL_checkinteger(L, 1);
void *buf = lua_newuserdata(L, len);
if(len > SMALLBUFSIZ) {
buf = lua_newuserdata(L, len);
}
#if defined(WITH_GETRANDOM)
/*