0,0 → 1,283 |
/* |
** $Id: lmathlib.c,v 1.80 2011/07/05 12:49:35 roberto Exp $ |
** Standard mathematical library |
** See Copyright Notice in lua.h |
*/ |
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#include <stdlib.h> |
#include <math.h> |
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#define lmathlib_c |
#define LUA_LIB |
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#include "lua.h" |
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#include "lauxlib.h" |
#include "lualib.h" |
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#undef PI |
#define PI (3.14159265358979323846) |
#define RADIANS_PER_DEGREE (PI/180.0) |
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/* macro 'l_tg' allows the addition of an 'l' or 'f' to all math operations */ |
#if !defined(l_tg) |
#define l_tg(x) (x) |
#endif |
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static int math_abs (lua_State *L) { |
lua_pushnumber(L, l_tg(fabs)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_sin (lua_State *L) { |
lua_pushnumber(L, l_tg(sin)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_sinh (lua_State *L) { |
lua_pushnumber(L, l_tg(sinh)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_cos (lua_State *L) { |
lua_pushnumber(L, l_tg(cos)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_cosh (lua_State *L) { |
lua_pushnumber(L, l_tg(cosh)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_tan (lua_State *L) { |
lua_pushnumber(L, l_tg(tan)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_tanh (lua_State *L) { |
lua_pushnumber(L, l_tg(tanh)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_asin (lua_State *L) { |
lua_pushnumber(L, l_tg(asin)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_acos (lua_State *L) { |
lua_pushnumber(L, l_tg(acos)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_atan (lua_State *L) { |
lua_pushnumber(L, l_tg(atan)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_atan2 (lua_State *L) { |
lua_pushnumber(L, l_tg(atan2)(luaL_checknumber(L, 1), |
luaL_checknumber(L, 2))); |
return 1; |
} |
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static int math_ceil (lua_State *L) { |
lua_pushnumber(L, l_tg(ceil)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_floor (lua_State *L) { |
lua_pushnumber(L, l_tg(floor)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_fmod (lua_State *L) { |
lua_pushnumber(L, l_tg(fmod)(luaL_checknumber(L, 1), |
luaL_checknumber(L, 2))); |
return 1; |
} |
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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; |
} |
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static int math_sqrt (lua_State *L) { |
lua_pushnumber(L, l_tg(sqrt)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_pow (lua_State *L) { |
lua_pushnumber(L, l_tg(pow)(luaL_checknumber(L, 1), |
luaL_checknumber(L, 2))); |
return 1; |
} |
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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; |
} |
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#if defined(LUA_COMPAT_LOG10) |
static int math_log10 (lua_State *L) { |
lua_pushnumber(L, l_tg(log10)(luaL_checknumber(L, 1))); |
return 1; |
} |
#endif |
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static int math_exp (lua_State *L) { |
lua_pushnumber(L, l_tg(exp)(luaL_checknumber(L, 1))); |
return 1; |
} |
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static int math_deg (lua_State *L) { |
lua_pushnumber(L, luaL_checknumber(L, 1)/RADIANS_PER_DEGREE); |
return 1; |
} |
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static int math_rad (lua_State *L) { |
lua_pushnumber(L, luaL_checknumber(L, 1)*RADIANS_PER_DEGREE); |
return 1; |
} |
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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; |
} |
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static int math_ldexp (lua_State *L) { |
lua_pushnumber(L, l_tg(ldexp)(luaL_checknumber(L, 1), |
luaL_checkint(L, 2))); |
return 1; |
} |
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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; |
} |
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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; |
} |
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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; |
} |
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static int math_randomseed (lua_State *L) { |
srand(luaL_checkunsigned(L, 1)); |
(void)rand(); /* discard first value to avoid undesirable correlations */ |
return 0; |
} |
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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} |
}; |
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/* |
** 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; |
} |
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