lmathlib.c File Reference

#include <stdlib.h>
#include <math.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"

Go to the source code of this file.

Macros
#define	lmathlib_c
#define	LUA_LIB
#define	PI   (3.14159265358979323846)
#define	RADIANS_PER_DEGREE   (PI/180.0)

Functions
static int	math_abs (lua_State *L)
static int	math_sin (lua_State *L)
static int	math_sinh (lua_State *L)
static int	math_cos (lua_State *L)
static int	math_cosh (lua_State *L)
static int	math_tan (lua_State *L)
static int	math_tanh (lua_State *L)
static int	math_asin (lua_State *L)
static int	math_acos (lua_State *L)
static int	math_atan (lua_State *L)
static int	math_atan2 (lua_State *L)
static int	math_ceil (lua_State *L)
static int	math_floor (lua_State *L)
static int	math_fmod (lua_State *L)
static int	math_modf (lua_State *L)
static int	math_sqrt (lua_State *L)
static int	math_pow (lua_State *L)
static int	math_log (lua_State *L)
static int	math_log10 (lua_State *L)
static int	math_exp (lua_State *L)
static int	math_deg (lua_State *L)
static int	math_rad (lua_State *L)
static int	math_frexp (lua_State *L)
static int	math_ldexp (lua_State *L)
static int	math_min (lua_State *L)
static int	math_max (lua_State *L)
static int	math_random (lua_State *L)
static int	math_randomseed (lua_State *L)
LUALIB_API int	luaopen_math (lua_State *L)

Variables
static const luaL_Reg	mathlib []

Macro Definition Documentation

lmathlib_c

#define lmathlib_c

Definition at line 11 of file lua-5.1.5/src/lmathlib.c.

LUA_LIB

#define LUA_LIB

Definition at line 12 of file lua-5.1.5/src/lmathlib.c.

PI

#define PI   (3.14159265358979323846)

Definition at line 21 of file lua-5.1.5/src/lmathlib.c.

Referenced by luaopen_math().

RADIANS_PER_DEGREE

#define RADIANS_PER_DEGREE   (PI/180.0)

Definition at line 22 of file lua-5.1.5/src/lmathlib.c.

Referenced by math_deg(), and math_rad().

Function Documentation

luaopen_math()

LUALIB_API int luaopen_math

(

lua_State *

L

)

Definition at line 251 of file lua-5.1.5/src/lmathlib.c.

                                           {
  luaL_register(L, LUA_MATHLIBNAME, mathlib);
  lua_pushnumber(L, PI);
  lua_setfield(L, -2, "pi");
  lua_pushnumber(L, HUGE_VAL);
  lua_setfield(L, -2, "huge");
#if defined(LUA_COMPAT_MOD)
  lua_getfield(L, -1, "fmod");
  lua_setfield(L, -2, "mod");
#endif
  return 1;
}

References lua_getfield(), LUA_MATHLIBNAME, lua_pushnumber(), lua_setfield(), luaL_register(), mathlib, and PI.

math_abs()

static int math_abs ( lua_State * L )

static

Definition at line 26 of file lua-5.1.5/src/lmathlib.c.

                                   {
  lua_pushnumber(L, fabs(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_acos()

static int math_acos ( lua_State * L )

static

Definition at line 66 of file lua-5.1.5/src/lmathlib.c.

                                    {
  lua_pushnumber(L, acos(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_asin()

static int math_asin ( lua_State * L )

static

Definition at line 61 of file lua-5.1.5/src/lmathlib.c.

                                    {
  lua_pushnumber(L, asin(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_atan()

static int math_atan ( lua_State * L )

static

Definition at line 71 of file lua-5.1.5/src/lmathlib.c.

                                    {
  lua_pushnumber(L, atan(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_atan2()

static int math_atan2 ( lua_State * L )

static

Definition at line 76 of file lua-5.1.5/src/lmathlib.c.

                                     {
  lua_pushnumber(L, atan2(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_ceil()

static int math_ceil ( lua_State * L )

static

Definition at line 81 of file lua-5.1.5/src/lmathlib.c.

                                    {
  lua_pushnumber(L, ceil(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_cos()

static int math_cos ( lua_State * L )

static

Definition at line 41 of file lua-5.1.5/src/lmathlib.c.

                                   {
  lua_pushnumber(L, cos(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_cosh()

static int math_cosh ( lua_State * L )

static

Definition at line 46 of file lua-5.1.5/src/lmathlib.c.

                                    {
  lua_pushnumber(L, cosh(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_deg()

static int math_deg ( lua_State * L )

static

Definition at line 129 of file lua-5.1.5/src/lmathlib.c.

                                   {
  lua_pushnumber(L, luaL_checknumber(L, 1)/RADIANS_PER_DEGREE);
  return 1;
}

References lua_pushnumber(), luaL_checknumber(), and RADIANS_PER_DEGREE.

math_exp()

static int math_exp ( lua_State * L )

static

Definition at line 124 of file lua-5.1.5/src/lmathlib.c.

                                   {
  lua_pushnumber(L, exp(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_floor()

static int math_floor ( lua_State * L )

static

Definition at line 86 of file lua-5.1.5/src/lmathlib.c.

                                     {
  lua_pushnumber(L, floor(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_fmod()

static int math_fmod ( lua_State * L )

static

Definition at line 91 of file lua-5.1.5/src/lmathlib.c.

                                    {
  lua_pushnumber(L, fmod(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_frexp()

static int math_frexp ( lua_State * L )

static

Definition at line 139 of file lua-5.1.5/src/lmathlib.c.

                                     {
  int e;
  lua_pushnumber(L, frexp(luaL_checknumber(L, 1), &e));
  lua_pushinteger(L, e);
  return 2;
}

References lua_pushinteger(), lua_pushnumber(), and luaL_checknumber().

math_ldexp()

static int math_ldexp ( lua_State * L )

static

Definition at line 146 of file lua-5.1.5/src/lmathlib.c.

                                     {
  lua_pushnumber(L, ldexp(luaL_checknumber(L, 1), luaL_checkint(L, 2)));
  return 1;
}

References lua_pushnumber(), luaL_checkint, and luaL_checknumber().

math_log()

static int math_log ( lua_State * L )

static

Definition at line 114 of file lua-5.1.5/src/lmathlib.c.

                                   {
  lua_pushnumber(L, log(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_log10()

static int math_log10 ( lua_State * L )

static

Definition at line 119 of file lua-5.1.5/src/lmathlib.c.

                                     {
  lua_pushnumber(L, log10(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_max()

static int math_max ( lua_State * L )

static

Definition at line 167 of file lua-5.1.5/src/lmathlib.c.

                                   {
  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;
}

References lua_gettop(), lua_pushnumber(), and luaL_checknumber().

math_min()

static int math_min ( lua_State * L )

static

Definition at line 153 of file lua-5.1.5/src/lmathlib.c.

                                   {
  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;
}

References lua_gettop(), lua_pushnumber(), and luaL_checknumber().

math_modf()

static int math_modf ( lua_State * L )

static

Definition at line 96 of file lua-5.1.5/src/lmathlib.c.

                                    {
  double ip;
  double fp = modf(luaL_checknumber(L, 1), &ip);
  lua_pushnumber(L, ip);
  lua_pushnumber(L, fp);
  return 2;
}

References lua_pushnumber(), and luaL_checknumber().

math_pow()

static int math_pow ( lua_State * L )

static

Definition at line 109 of file lua-5.1.5/src/lmathlib.c.

                                   {
  lua_pushnumber(L, pow(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_rad()

static int math_rad ( lua_State * L )

static

Definition at line 134 of file lua-5.1.5/src/lmathlib.c.

                                   {
  lua_pushnumber(L, luaL_checknumber(L, 1)*RADIANS_PER_DEGREE);
  return 1;
}

References lua_pushnumber(), luaL_checknumber(), and RADIANS_PER_DEGREE.

math_random()

static int math_random ( lua_State * L )

static

Definition at line 181 of file lua-5.1.5/src/lmathlib.c.

                                      {
  /* 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 */
      int u = luaL_checkint(L, 1);
      luaL_argcheck(L, 1<=u, 1, "interval is empty");
      lua_pushnumber(L, floor(r*u)+1);  /* int between 1 and `u' */
      break;
    }
    case 2: {  /* lower and upper limits */
      int l = luaL_checkint(L, 1);
      int u = luaL_checkint(L, 2);
      luaL_argcheck(L, l<=u, 2, "interval is empty");
      lua_pushnumber(L, floor(r*(u-l+1))+l);  /* int between `l' and `u' */
      break;
    }
    default: return luaL_error(L, "wrong number of arguments");
  }
  return 1;
}

References lua_gettop(), lua_pushnumber(), luaL_argcheck, luaL_checkint, and luaL_error().

math_randomseed()

static int math_randomseed ( lua_State * L )

static

Definition at line 209 of file lua-5.1.5/src/lmathlib.c.

                                          {
  srand(luaL_checkint(L, 1));
  return 0;
}

References luaL_checkint.

math_sin()

static int math_sin ( lua_State * L )

static

Definition at line 31 of file lua-5.1.5/src/lmathlib.c.

                                   {
  lua_pushnumber(L, sin(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_sinh()

static int math_sinh ( lua_State * L )

static

Definition at line 36 of file lua-5.1.5/src/lmathlib.c.

                                    {
  lua_pushnumber(L, sinh(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_sqrt()

static int math_sqrt ( lua_State * L )

static

Definition at line 104 of file lua-5.1.5/src/lmathlib.c.

                                    {
  lua_pushnumber(L, sqrt(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_tan()

static int math_tan ( lua_State * L )

static

Definition at line 51 of file lua-5.1.5/src/lmathlib.c.

                                   {
  lua_pushnumber(L, tan(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

math_tanh()

static int math_tanh ( lua_State * L )

static

Definition at line 56 of file lua-5.1.5/src/lmathlib.c.

                                    {
  lua_pushnumber(L, tanh(luaL_checknumber(L, 1)));
  return 1;
}

References lua_pushnumber(), and luaL_checknumber().

Variable Documentation

mathlib

const luaL_Reg mathlib[]

static

Definition at line 215 of file lua-5.1.5/src/lmathlib.c.

                                  {
  {"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},
  {"log10", math_log10},
  {"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}
};

Referenced by luaopen_math().