/* | |
** $Id: lmathlib.c,v 1.83.1.1 2013/04/12 18:48:47 roberto Exp $ | |
** Standard mathematical library | |
** See Copyright Notice in lua.h | |
*/ | |
#include <stdlib.h> | |
#include <math.h> | |
#define lmathlib_c | |
#define LUA_LIB | |
#include "lua.h" | |
#include "lauxlib.h" | |
#include "lualib.h" | |
#undef PI | |
#define PI ((lua_Number)(3.1415926535897932384626433832795)) | |
#define RADIANS_PER_DEGREE ((lua_Number)(PI/180.0)) | |
static int math_abs (lua_State *L) { | |
lua_pushnumber(L, l_mathop(fabs)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_sin (lua_State *L) { | |
lua_pushnumber(L, l_mathop(sin)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_sinh (lua_State *L) { | |
lua_pushnumber(L, l_mathop(sinh)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_cos (lua_State *L) { | |
lua_pushnumber(L, l_mathop(cos)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_cosh (lua_State *L) { | |
lua_pushnumber(L, l_mathop(cosh)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_tan (lua_State *L) { | |
lua_pushnumber(L, l_mathop(tan)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_tanh (lua_State *L) { | |
lua_pushnumber(L, l_mathop(tanh)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_asin (lua_State *L) { | |
lua_pushnumber(L, l_mathop(asin)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_acos (lua_State *L) { | |
lua_pushnumber(L, l_mathop(acos)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_atan (lua_State *L) { | |
lua_pushnumber(L, l_mathop(atan)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_atan2 (lua_State *L) { | |
lua_pushnumber(L, l_mathop(atan2)(luaL_checknumber(L, 1), | |
luaL_checknumber(L, 2))); | |
return 1; | |
} | |
static int math_ceil (lua_State *L) { | |
lua_pushnumber(L, l_mathop(ceil)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_floor (lua_State *L) { | |
lua_pushnumber(L, l_mathop(floor)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_fmod (lua_State *L) { | |
lua_pushnumber(L, l_mathop(fmod)(luaL_checknumber(L, 1), | |
luaL_checknumber(L, 2))); | |
return 1; | |
} | |
static int math_modf (lua_State *L) { | |
lua_Number ip; | |
lua_Number fp = l_mathop(modf)(luaL_checknumber(L, 1), &ip); | |
lua_pushnumber(L, ip); | |
lua_pushnumber(L, fp); | |
return 2; | |
} | |
static int math_sqrt (lua_State *L) { | |
lua_pushnumber(L, l_mathop(sqrt)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_pow (lua_State *L) { | |
lua_Number x = luaL_checknumber(L, 1); | |
lua_Number y = luaL_checknumber(L, 2); | |
lua_pushnumber(L, l_mathop(pow)(x, y)); | |
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_mathop(log)(x); | |
else { | |
lua_Number base = luaL_checknumber(L, 2); | |
if (base == (lua_Number)10.0) res = l_mathop(log10)(x); | |
else res = l_mathop(log)(x)/l_mathop(log)(base); | |
} | |
lua_pushnumber(L, res); | |
return 1; | |
} | |
#if defined(LUA_COMPAT_LOG10) | |
static int math_log10 (lua_State *L) { | |
lua_pushnumber(L, l_mathop(log10)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
#endif | |
static int math_exp (lua_State *L) { | |
lua_pushnumber(L, l_mathop(exp)(luaL_checknumber(L, 1))); | |
return 1; | |
} | |
static int math_deg (lua_State *L) { | |
lua_pushnumber(L, luaL_checknumber(L, 1)/RADIANS_PER_DEGREE); | |
return 1; | |
} | |
static int math_rad (lua_State *L) { | |
lua_pushnumber(L, luaL_checknumber(L, 1)*RADIANS_PER_DEGREE); | |
return 1; | |
} | |
static int math_frexp (lua_State *L) { | |
int e; | |
lua_pushnumber(L, l_mathop(frexp)(luaL_checknumber(L, 1), &e)); | |
lua_pushinteger(L, e); | |
return 2; | |
} | |
static int math_ldexp (lua_State *L) { | |
lua_Number x = luaL_checknumber(L, 1); | |
int ep = luaL_checkint(L, 2); | |
lua_pushnumber(L, l_mathop(ldexp)(x, ep)); | |
return 1; | |
} | |
static int math_min (lua_State *L) { | |
int n = lua_gettop(L); /* number of arguments */ | |
lua_Number dmin = luaL_checknumber(L, 1); | |
int i; | |
for (i=2; i<=n; i++) { | |
lua_Number d = luaL_checknumber(L, i); | |
if (d < dmin) | |
dmin = d; | |
} | |
lua_pushnumber(L, dmin); | |
return 1; | |
} | |
static int math_max (lua_State *L) { | |
int n = lua_gettop(L); /* number of arguments */ | |
lua_Number dmax = luaL_checknumber(L, 1); | |
int i; | |
for (i=2; i<=n; i++) { | |
lua_Number d = luaL_checknumber(L, i); | |
if (d > dmax) | |
dmax = d; | |
} | |
lua_pushnumber(L, dmax); | |
return 1; | |
} | |
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, (lua_Number)1.0 <= u, 1, "interval is empty"); | |
lua_pushnumber(L, l_mathop(floor)(r*u) + (lua_Number)(1.0)); /* [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_mathop(floor)(r*(u-l+1)) + l); /* [l, u] */ | |
break; | |
} | |
default: return luaL_error(L, "wrong number of arguments"); | |
} | |
return 1; | |
} | |
static int math_randomseed (lua_State *L) { | |
srand(luaL_checkunsigned(L, 1)); | |
(void)rand(); /* discard first value to avoid undesirable correlations */ | |
return 0; | |
} | |
static const luaL_Reg mathlib[] = { | |
{"abs", math_abs}, | |
{"acos", math_acos}, | |
{"asin", math_asin}, | |
{"atan2", math_atan2}, | |
{"atan", math_atan}, | |
{"ceil", math_ceil}, | |
{"cosh", math_cosh}, | |
{"cos", math_cos}, | |
{"deg", math_deg}, | |
{"exp", math_exp}, | |
{"floor", math_floor}, | |
{"fmod", math_fmod}, | |
{"frexp", math_frexp}, | |
{"ldexp", math_ldexp}, | |
#if defined(LUA_COMPAT_LOG10) | |
{"log10", math_log10}, | |
#endif | |
{"log", math_log}, | |
{"max", math_max}, | |
{"min", math_min}, | |
{"modf", math_modf}, | |
{"pow", math_pow}, | |
{"rad", math_rad}, | |
{"random", math_random}, | |
{"randomseed", math_randomseed}, | |
{"sinh", math_sinh}, | |
{"sin", math_sin}, | |
{"sqrt", math_sqrt}, | |
{"tanh", math_tanh}, | |
{"tan", math_tan}, | |
{NULL, NULL} | |
}; | |
/* | |
** Open math library | |
*/ | |
LUAMOD_API int luaopen_math (lua_State *L) { | |
luaL_newlib(L, mathlib); | |
lua_pushnumber(L, PI); | |
lua_setfield(L, -2, "pi"); | |
lua_pushnumber(L, HUGE_VAL); | |
lua_setfield(L, -2, "huge"); | |
return 1; | |
} | |