lmathlib.c
上传用户:yisoukefu
上传日期:2020-08-09
资源大小:39506k
文件大小:6k
- /*
- ** $Id: lmathlib.c,v 1.67 2005/08/26 17:36:32 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 (3.14159265358979323846)
- #define RADIANS_PER_DEGREE (PI/180.0)
- static int math_abs (lua_State *L) {
- lua_pushnumber(L, fabs(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_sin (lua_State *L) {
- lua_pushnumber(L, sin(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_sinh (lua_State *L) {
- lua_pushnumber(L, sinh(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_cos (lua_State *L) {
- lua_pushnumber(L, cos(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_cosh (lua_State *L) {
- lua_pushnumber(L, cosh(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_tan (lua_State *L) {
- lua_pushnumber(L, tan(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_tanh (lua_State *L) {
- lua_pushnumber(L, tanh(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_asin (lua_State *L) {
- lua_pushnumber(L, asin(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_acos (lua_State *L) {
- lua_pushnumber(L, acos(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_atan (lua_State *L) {
- lua_pushnumber(L, atan(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_atan2 (lua_State *L) {
- lua_pushnumber(L, atan2(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
- return 1;
- }
- static int math_ceil (lua_State *L) {
- lua_pushnumber(L, ceil(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_floor (lua_State *L) {
- lua_pushnumber(L, floor(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_fmod (lua_State *L) {
- lua_pushnumber(L, fmod(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
- return 1;
- }
- static int math_modf (lua_State *L) {
- double ip;
- double fp = 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, sqrt(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_pow (lua_State *L) {
- lua_pushnumber(L, pow(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
- return 1;
- }
- static int math_log (lua_State *L) {
- lua_pushnumber(L, log(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_log10 (lua_State *L) {
- lua_pushnumber(L, log10(luaL_checknumber(L, 1)));
- return 1;
- }
- static int math_exp (lua_State *L) {
- lua_pushnumber(L, 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, frexp(luaL_checknumber(L, 1), &e));
- lua_pushinteger(L, e);
- return 2;
- }
- static int math_ldexp (lua_State *L) {
- lua_pushnumber(L, ldexp(luaL_checknumber(L, 1), luaL_checkint(L, 2)));
- 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 */
- 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;
- }
- static int math_randomseed (lua_State *L) {
- srand(luaL_checkint(L, 1));
- 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},
- {"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}
- };
- /*
- ** Open math library
- */
- LUALIB_API int luaopen_math (lua_State *L) {
- 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;
- }