forked from izaya/LuPPC
408 lines
9.6 KiB
C
408 lines
9.6 KiB
C
/*
|
|
** $Id: lmathlib.c,v 1.117 2015/10/02 15:39:23 roberto Exp $
|
|
** Standard mathematical library
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
#define lmathlib_c
|
|
#define LUA_LIB
|
|
|
|
#include "lprefix.h"
|
|
|
|
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
|
|
#include "lua.h"
|
|
|
|
#include "lauxlib.h"
|
|
#include "lualib.h"
|
|
|
|
|
|
#undef PI
|
|
#define PI (l_mathop(3.141592653589793238462643383279502884))
|
|
|
|
|
|
#if !defined(l_rand) /* { */
|
|
#if defined(LUA_USE_POSIX)
|
|
#define l_rand() random()
|
|
#define l_srand(x) srandom(x)
|
|
#define L_RANDMAX 2147483647 /* (2^31 - 1), following POSIX */
|
|
#else
|
|
#define l_rand() rand()
|
|
#define l_srand(x) srand(x)
|
|
#define L_RANDMAX RAND_MAX
|
|
#endif
|
|
#endif /* } */
|
|
|
|
|
|
static int math_abs (lua_State *L) {
|
|
if (lua_isinteger(L, 1)) {
|
|
lua_Integer n = lua_tointeger(L, 1);
|
|
if (n < 0) n = (lua_Integer)(0u - (lua_Unsigned)n);
|
|
lua_pushinteger(L, n);
|
|
}
|
|
else
|
|
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_cos (lua_State *L) {
|
|
lua_pushnumber(L, l_mathop(cos)(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_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_Number y = luaL_checknumber(L, 1);
|
|
lua_Number x = luaL_optnumber(L, 2, 1);
|
|
lua_pushnumber(L, l_mathop(atan2)(y, x));
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int math_toint (lua_State *L) {
|
|
int valid;
|
|
lua_Integer n = lua_tointegerx(L, 1, &valid);
|
|
if (valid)
|
|
lua_pushinteger(L, n);
|
|
else {
|
|
luaL_checkany(L, 1);
|
|
lua_pushnil(L); /* value is not convertible to integer */
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
static void pushnumint (lua_State *L, lua_Number d) {
|
|
lua_Integer n;
|
|
if (lua_numbertointeger(d, &n)) /* does 'd' fit in an integer? */
|
|
lua_pushinteger(L, n); /* result is integer */
|
|
else
|
|
lua_pushnumber(L, d); /* result is float */
|
|
}
|
|
|
|
|
|
static int math_floor (lua_State *L) {
|
|
if (lua_isinteger(L, 1))
|
|
lua_settop(L, 1); /* integer is its own floor */
|
|
else {
|
|
lua_Number d = l_mathop(floor)(luaL_checknumber(L, 1));
|
|
pushnumint(L, d);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int math_ceil (lua_State *L) {
|
|
if (lua_isinteger(L, 1))
|
|
lua_settop(L, 1); /* integer is its own ceil */
|
|
else {
|
|
lua_Number d = l_mathop(ceil)(luaL_checknumber(L, 1));
|
|
pushnumint(L, d);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int math_fmod (lua_State *L) {
|
|
if (lua_isinteger(L, 1) && lua_isinteger(L, 2)) {
|
|
lua_Integer d = lua_tointeger(L, 2);
|
|
if ((lua_Unsigned)d + 1u <= 1u) { /* special cases: -1 or 0 */
|
|
luaL_argcheck(L, d != 0, 2, "zero");
|
|
lua_pushinteger(L, 0); /* avoid overflow with 0x80000... / -1 */
|
|
}
|
|
else
|
|
lua_pushinteger(L, lua_tointeger(L, 1) % d);
|
|
}
|
|
else
|
|
lua_pushnumber(L, l_mathop(fmod)(luaL_checknumber(L, 1),
|
|
luaL_checknumber(L, 2)));
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
** next function does not use 'modf', avoiding problems with 'double*'
|
|
** (which is not compatible with 'float*') when lua_Number is not
|
|
** 'double'.
|
|
*/
|
|
static int math_modf (lua_State *L) {
|
|
if (lua_isinteger(L ,1)) {
|
|
lua_settop(L, 1); /* number is its own integer part */
|
|
lua_pushnumber(L, 0); /* no fractional part */
|
|
}
|
|
else {
|
|
lua_Number n = luaL_checknumber(L, 1);
|
|
/* integer part (rounds toward zero) */
|
|
lua_Number ip = (n < 0) ? l_mathop(ceil)(n) : l_mathop(floor)(n);
|
|
pushnumint(L, ip);
|
|
/* fractional part (test needed for inf/-inf) */
|
|
lua_pushnumber(L, (n == ip) ? l_mathop(0.0) : (n - ip));
|
|
}
|
|
return 2;
|
|
}
|
|
|
|
|
|
static int math_sqrt (lua_State *L) {
|
|
lua_pushnumber(L, l_mathop(sqrt)(luaL_checknumber(L, 1)));
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int math_ult (lua_State *L) {
|
|
lua_Integer a = luaL_checkinteger(L, 1);
|
|
lua_Integer b = luaL_checkinteger(L, 2);
|
|
lua_pushboolean(L, (lua_Unsigned)a < (lua_Unsigned)b);
|
|
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 !defined(LUA_USE_C89)
|
|
if (base == 2.0) res = l_mathop(log2)(x); else
|
|
#endif
|
|
if (base == 10.0) res = l_mathop(log10)(x);
|
|
else res = l_mathop(log)(x)/l_mathop(log)(base);
|
|
}
|
|
lua_pushnumber(L, res);
|
|
return 1;
|
|
}
|
|
|
|
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) * (l_mathop(180.0) / PI));
|
|
return 1;
|
|
}
|
|
|
|
static int math_rad (lua_State *L) {
|
|
lua_pushnumber(L, luaL_checknumber(L, 1) * (PI / l_mathop(180.0)));
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int math_min (lua_State *L) {
|
|
int n = lua_gettop(L); /* number of arguments */
|
|
int imin = 1; /* index of current minimum value */
|
|
int i;
|
|
luaL_argcheck(L, n >= 1, 1, "value expected");
|
|
for (i = 2; i <= n; i++) {
|
|
if (lua_compare(L, i, imin, LUA_OPLT))
|
|
imin = i;
|
|
}
|
|
lua_pushvalue(L, imin);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int math_max (lua_State *L) {
|
|
int n = lua_gettop(L); /* number of arguments */
|
|
int imax = 1; /* index of current maximum value */
|
|
int i;
|
|
luaL_argcheck(L, n >= 1, 1, "value expected");
|
|
for (i = 2; i <= n; i++) {
|
|
if (lua_compare(L, imax, i, LUA_OPLT))
|
|
imax = i;
|
|
}
|
|
lua_pushvalue(L, imax);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
** This function uses 'double' (instead of 'lua_Number') to ensure that
|
|
** all bits from 'l_rand' can be represented, and that 'RANDMAX + 1.0'
|
|
** will keep full precision (ensuring that 'r' is always less than 1.0.)
|
|
*/
|
|
static int math_random (lua_State *L) {
|
|
lua_Integer low, up;
|
|
double r = (double)l_rand() * (1.0 / ((double)L_RANDMAX + 1.0));
|
|
switch (lua_gettop(L)) { /* check number of arguments */
|
|
case 0: { /* no arguments */
|
|
lua_pushnumber(L, (lua_Number)r); /* Number between 0 and 1 */
|
|
return 1;
|
|
}
|
|
case 1: { /* only upper limit */
|
|
low = 1;
|
|
up = luaL_checkinteger(L, 1);
|
|
break;
|
|
}
|
|
case 2: { /* lower and upper limits */
|
|
low = luaL_checkinteger(L, 1);
|
|
up = luaL_checkinteger(L, 2);
|
|
break;
|
|
}
|
|
default: return luaL_error(L, "wrong number of arguments");
|
|
}
|
|
/* random integer in the interval [low, up] */
|
|
luaL_argcheck(L, low <= up, 1, "interval is empty");
|
|
luaL_argcheck(L, low >= 0 || up <= LUA_MAXINTEGER + low, 1,
|
|
"interval too large");
|
|
r *= (double)(up - low) + 1.0;
|
|
lua_pushinteger(L, (lua_Integer)r + low);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int math_randomseed (lua_State *L) {
|
|
l_srand((unsigned int)(lua_Integer)luaL_checknumber(L, 1));
|
|
(void)l_rand(); /* discard first value to avoid undesirable correlations */
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int math_type (lua_State *L) {
|
|
if (lua_type(L, 1) == LUA_TNUMBER) {
|
|
if (lua_isinteger(L, 1))
|
|
lua_pushliteral(L, "integer");
|
|
else
|
|
lua_pushliteral(L, "float");
|
|
}
|
|
else {
|
|
luaL_checkany(L, 1);
|
|
lua_pushnil(L);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
** {==================================================================
|
|
** Deprecated functions (for compatibility only)
|
|
** ===================================================================
|
|
*/
|
|
#if defined(LUA_COMPAT_MATHLIB)
|
|
|
|
static int math_cosh (lua_State *L) {
|
|
lua_pushnumber(L, l_mathop(cosh)(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_tanh (lua_State *L) {
|
|
lua_pushnumber(L, l_mathop(tanh)(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_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 = (int)luaL_checkinteger(L, 2);
|
|
lua_pushnumber(L, l_mathop(ldexp)(x, ep));
|
|
return 1;
|
|
}
|
|
|
|
static int math_log10 (lua_State *L) {
|
|
lua_pushnumber(L, l_mathop(log10)(luaL_checknumber(L, 1)));
|
|
return 1;
|
|
}
|
|
|
|
#endif
|
|
/* }================================================================== */
|
|
|
|
|
|
|
|
static const luaL_Reg mathlib[] = {
|
|
{"abs", math_abs},
|
|
{"acos", math_acos},
|
|
{"asin", math_asin},
|
|
{"atan", math_atan},
|
|
{"ceil", math_ceil},
|
|
{"cos", math_cos},
|
|
{"deg", math_deg},
|
|
{"exp", math_exp},
|
|
{"tointeger", math_toint},
|
|
{"floor", math_floor},
|
|
{"fmod", math_fmod},
|
|
{"ult", math_ult},
|
|
{"log", math_log},
|
|
{"max", math_max},
|
|
{"min", math_min},
|
|
{"modf", math_modf},
|
|
{"rad", math_rad},
|
|
{"random", math_random},
|
|
{"randomseed", math_randomseed},
|
|
{"sin", math_sin},
|
|
{"sqrt", math_sqrt},
|
|
{"tan", math_tan},
|
|
{"type", math_type},
|
|
#if defined(LUA_COMPAT_MATHLIB)
|
|
{"atan2", math_atan},
|
|
{"cosh", math_cosh},
|
|
{"sinh", math_sinh},
|
|
{"tanh", math_tanh},
|
|
{"pow", math_pow},
|
|
{"frexp", math_frexp},
|
|
{"ldexp", math_ldexp},
|
|
{"log10", math_log10},
|
|
#endif
|
|
/* placeholders */
|
|
{"pi", NULL},
|
|
{"huge", NULL},
|
|
{"maxinteger", NULL},
|
|
{"mininteger", NULL},
|
|
{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, (lua_Number)HUGE_VAL);
|
|
lua_setfield(L, -2, "huge");
|
|
lua_pushinteger(L, LUA_MAXINTEGER);
|
|
lua_setfield(L, -2, "maxinteger");
|
|
lua_pushinteger(L, LUA_MININTEGER);
|
|
lua_setfield(L, -2, "mininteger");
|
|
return 1;
|
|
}
|
|
|