static int math_random (lua_State *L) {
/* the `%' avoids the (rare) case of r==1, and is needed also because on
some systems (SunOS!) `rand()' may return a value larger than RAND_MAX */
lua_Number r = (lua_Number)(rand()%RAND_MAX) / (lua_Number)RAND_MAX;
switch (lua_gettop(L)) { /* check number of arguments */
case 0: { /* no arguments */
lua_pushnumber(L, r); /* Number between 0 and 1 */
break;
}
case 1: { /* only upper limit */
lua_Number u = luaL_checknumber(L, 1);
luaL_argcheck(L, 1.0 <= u, 1, "interval is empty");
lua_pushnumber(L, l_tg(floor)(r*u) + 1.0); /* int in [1, u] */
break;
}
case 2: { /* lower and upper limits */
lua_Number l = luaL_checknumber(L, 1);
lua_Number u = luaL_checknumber(L, 2);
luaL_argcheck(L, l <= u, 2, "interval is empty");
lua_pushnumber(L, l_tg(floor)(r*(u-l+1)) + l); /* int in [l, u] */
break;
}
default: return luaL_error(L, "wrong number of arguments");
}
return 1;
}
static int math_log (lua_State *L) {
lua_Number x = luaL_checknumber(L, 1);
lua_Number res;
if (lua_isnoneornil(L, 2))
res = l_tg(log)(x);
else {
lua_Number base = luaL_checknumber(L, 2);
if (base == 10.0) res = l_tg(log10)(x);
else res = l_tg(log)(x)/l_tg(log)(base);
}
lua_pushnumber(L, res);
return 1;
}
static int math_modf (lua_State *L) {
lua_Number ip;
lua_Number fp = l_tg(modf)(luaL_checknumber(L, 1), &ip);
lua_pushnumber(L, ip);
lua_pushnumber(L, fp);
return 2;
}
static int math_log10 (lua_State *L) {
#if !defined(LUA_COMPAT_LOG10)
return luaL_error(L, "function " LUA_QL("log10")
" is deprecated; use log(x, 10) instead");
#else
lua_pushnumber(L, l_tg(log10)(luaL_checknumber(L, 1)));
return 1;
#endif
}
static int math_fmod (lua_State *L) {
lua_pushnumber(L, l_tg(fmod)(luaL_checknumber(L, 1),
luaL_checknumber(L, 2)));
return 1;
}
static int math_floor (lua_State *L) {
lua_pushnumber(L, l_tg(floor)(luaL_checknumber(L, 1)));
return 1;
}
static int math_ceil (lua_State *L) {
lua_pushnumber(L, l_tg(ceil)(luaL_checknumber(L, 1)));
return 1;
}
static int math_atan2 (lua_State *L) {
lua_pushnumber(L, l_tg(atan2)(luaL_checknumber(L, 1),
luaL_checknumber(L, 2)));
return 1;
}
static int math_acos (lua_State *L) {
lua_pushnumber(L, l_tg(acos)(luaL_checknumber(L, 1)));
return 1;
}
static int math_tanh (lua_State *L) {
lua_pushnumber(L, l_tg(tanh)(luaL_checknumber(L, 1)));
return 1;
}
static int math_sin (lua_State *L) {
lua_pushnumber(L, l_tg(sin)(luaL_checknumber(L, 1)));
return 1;
}
static int math_ldexp (lua_State *L) {
lua_pushnumber(L, l_tg(ldexp)(luaL_checknumber(L, 1),
luaL_checkint(L, 2)));
return 1;
}
static int math_frexp (lua_State *L) {
int e;
lua_pushnumber(L, l_tg(frexp)(luaL_checknumber(L, 1), &e));
lua_pushinteger(L, e);
return 2;
}
static int math_exp (lua_State *L) {
lua_pushnumber(L, l_tg(exp)(luaL_checknumber(L, 1)));
return 1;
}
static int math_pow (lua_State *L) {
lua_pushnumber(L, l_tg(pow)(luaL_checknumber(L, 1),
luaL_checknumber(L, 2)));
return 1;
}
static int math_log10 (lua_State *L) {
lua_pushnumber(L, l_tg(log10)(luaL_checknumber(L, 1)));
return 1;
}