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[Redbean] Add UuidV4 method (#1140)

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BONNAURE Olivier 2024-04-12 17:10:27 +02:00 • committed by GitHub
parent 3e16e59f72
commit 39dde41516
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25
tool/net/lfuncs.c
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@ -829,6 +829,31 @@ int LuaVisualizeControlCodes(lua_State *L) {
return LuaCoder(L, VisualizeControlCodes);
}
int LuaUuidV4(lua_State *L) {
static const char v[] = {'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
char uuid_str[37] = {0};
uint64_t r = _rand64();
int j = 0;
for (int i = 0; i < 36; ++i, ++j) {
if (j == 16) {
r = _rand64();
j = 0;
}
uuid_str[i] = v[(r & (0xfull << (j * 4ull))) >> (j * 4ull)];
}
uuid_str[8] = '-';
uuid_str[13] = '-';
uuid_str[14] = '4';
uuid_str[18] = '-';
uuid_str[19] = v[8 | (r & (0x3ull << (j * 4ull))) >> (j * 4ull)];
uuid_str[23] = '-';
uuid_str[36] = '\0';
lua_pushfstring(L, uuid_str);
return 1;
}
static dontinline int LuaHasherImpl(lua_State *L, size_t k,
int H(const void *, size_t, uint8_t *)) {
size_t n;