diff options
Diffstat (limited to 'lua/src/lmathlib.c')
| -rw-r--r-- | lua/src/lmathlib.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/lua/src/lmathlib.c b/lua/src/lmathlib.c new file mode 100644 index 0000000..fe9fc54 --- /dev/null +++ b/lua/src/lmathlib.c @@ -0,0 +1,279 @@ +/* +** $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; +} + |