mirror of
https://github.com/lua/lua
synced 2024-12-05 19:01:55 +03:00
247 lines
5.4 KiB
C
247 lines
5.4 KiB
C
/*
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** $Id: lmathlib.c,v 1.53 2002/12/04 17:38:31 roberto Exp roberto $
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** Standard mathematical library
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** See Copyright Notice in lua.h
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*/
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#include <stdlib.h>
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#include <math.h>
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#define lmathlib_c
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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#undef PI
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#define PI (3.14159265358979323846)
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#define RADIANS_PER_DEGREE (PI/180.0)
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/*
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** If you want Lua to operate in degrees (instead of radians),
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** define USE_DEGREES
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*/
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#ifdef USE_DEGREES
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#define FROMRAD(a) ((a)/RADIANS_PER_DEGREE)
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#define TORAD(a) ((a)*RADIANS_PER_DEGREE)
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#else
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#define FROMRAD(a) (a)
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#define TORAD(a) (a)
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#endif
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static int math_abs (lua_State *L) {
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lua_pushnumber(L, fabs(luaL_checknumber(L, 1)));
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return 1;
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}
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static int math_sin (lua_State *L) {
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lua_pushnumber(L, sin(TORAD(luaL_checknumber(L, 1))));
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return 1;
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}
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static int math_cos (lua_State *L) {
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lua_pushnumber(L, cos(TORAD(luaL_checknumber(L, 1))));
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return 1;
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}
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static int math_tan (lua_State *L) {
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lua_pushnumber(L, tan(TORAD(luaL_checknumber(L, 1))));
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return 1;
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}
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static int math_asin (lua_State *L) {
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lua_pushnumber(L, FROMRAD(asin(luaL_checknumber(L, 1))));
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return 1;
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}
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static int math_acos (lua_State *L) {
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lua_pushnumber(L, FROMRAD(acos(luaL_checknumber(L, 1))));
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return 1;
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}
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static int math_atan (lua_State *L) {
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lua_pushnumber(L, FROMRAD(atan(luaL_checknumber(L, 1))));
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return 1;
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}
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static int math_atan2 (lua_State *L) {
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lua_pushnumber(L, FROMRAD(atan2(luaL_checknumber(L, 1), luaL_checknumber(L, 2))));
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return 1;
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}
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static int math_ceil (lua_State *L) {
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lua_pushnumber(L, ceil(luaL_checknumber(L, 1)));
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return 1;
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}
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static int math_floor (lua_State *L) {
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lua_pushnumber(L, floor(luaL_checknumber(L, 1)));
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return 1;
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}
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static int math_mod (lua_State *L) {
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lua_pushnumber(L, fmod(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
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return 1;
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}
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static int math_sqrt (lua_State *L) {
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lua_pushnumber(L, sqrt(luaL_checknumber(L, 1)));
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return 1;
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}
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static int math_pow (lua_State *L) {
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lua_pushnumber(L, pow(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
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return 1;
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}
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static int math_log (lua_State *L) {
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lua_pushnumber(L, log(luaL_checknumber(L, 1)));
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return 1;
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}
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static int math_log10 (lua_State *L) {
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lua_pushnumber(L, log10(luaL_checknumber(L, 1)));
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return 1;
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}
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static int math_exp (lua_State *L) {
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lua_pushnumber(L, exp(luaL_checknumber(L, 1)));
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return 1;
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}
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static int math_deg (lua_State *L) {
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lua_pushnumber(L, luaL_checknumber(L, 1)/RADIANS_PER_DEGREE);
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return 1;
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}
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static int math_rad (lua_State *L) {
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lua_pushnumber(L, luaL_checknumber(L, 1)*RADIANS_PER_DEGREE);
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return 1;
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}
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static int math_frexp (lua_State *L) {
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int e;
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lua_pushnumber(L, frexp(luaL_checknumber(L, 1), &e));
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lua_pushnumber(L, e);
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return 2;
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}
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static int math_ldexp (lua_State *L) {
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lua_pushnumber(L, ldexp(luaL_checknumber(L, 1), luaL_checkint(L, 2)));
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return 1;
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}
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static int math_min (lua_State *L) {
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int n = lua_gettop(L); /* number of arguments */
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lua_Number dmin = luaL_checknumber(L, 1);
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int i;
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for (i=2; i<=n; i++) {
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lua_Number d = luaL_checknumber(L, i);
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if (d < dmin)
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dmin = d;
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}
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lua_pushnumber(L, dmin);
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return 1;
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}
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static int math_max (lua_State *L) {
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int n = lua_gettop(L); /* number of arguments */
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lua_Number dmax = luaL_checknumber(L, 1);
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int i;
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for (i=2; i<=n; i++) {
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lua_Number d = luaL_checknumber(L, i);
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if (d > dmax)
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dmax = d;
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}
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lua_pushnumber(L, dmax);
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return 1;
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}
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static int math_random (lua_State *L) {
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/* the `%' avoids the (rare) case of r==1, and is needed also because on
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some systems (SunOS!) `rand()' may return a value larger than RAND_MAX */
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lua_Number r = (lua_Number)(rand()%RAND_MAX) / (lua_Number)RAND_MAX;
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switch (lua_gettop(L)) { /* check number of arguments */
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case 0: { /* no arguments */
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lua_pushnumber(L, r); /* Number between 0 and 1 */
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break;
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}
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case 1: { /* only upper limit */
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int u = luaL_checkint(L, 1);
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luaL_argcheck(L, 1<=u, 1, "interval is empty");
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lua_pushnumber(L, (int)floor(r*u)+1); /* int between 1 and `u' */
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break;
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}
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case 2: { /* lower and upper limits */
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int l = luaL_checkint(L, 1);
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int u = luaL_checkint(L, 2);
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luaL_argcheck(L, l<=u, 2, "interval is empty");
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lua_pushnumber(L, (int)floor(r*(u-l+1))+l); /* int between `l' and `u' */
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break;
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}
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default: return luaL_error(L, "wrong number of arguments");
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}
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return 1;
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}
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static int math_randomseed (lua_State *L) {
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srand(luaL_checkint(L, 1));
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return 0;
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}
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static const luaL_reg mathlib[] = {
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{"abs", math_abs},
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{"sin", math_sin},
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{"cos", math_cos},
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{"tan", math_tan},
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{"asin", math_asin},
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{"acos", math_acos},
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{"atan", math_atan},
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{"atan2", math_atan2},
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{"ceil", math_ceil},
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{"floor", math_floor},
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{"mod", math_mod},
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{"frexp", math_frexp},
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{"ldexp", math_ldexp},
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{"sqrt", math_sqrt},
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{"min", math_min},
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{"max", math_max},
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{"log", math_log},
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{"log10", math_log10},
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{"exp", math_exp},
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{"deg", math_deg},
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{"pow", math_pow},
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{"rad", math_rad},
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{"random", math_random},
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{"randomseed", math_randomseed},
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{NULL, NULL}
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};
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/*
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** Open math library
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*/
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LUALIB_API int lua_mathlibopen (lua_State *L) {
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luaL_openlib(L, LUA_MATHLIBNAME, mathlib, 0);
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lua_pushliteral(L, "pi");
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lua_pushnumber(L, PI);
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lua_settable(L, -3);
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lua_pushliteral(L, "__pow");
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lua_pushcfunction(L, math_pow);
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lua_settable(L, LUA_REGISTRYINDEX);
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return 1;
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}
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