Lua 5.1.4: lmathlib.c

L0001    /*
L0002    ** $Id: lmathlib.c,v 1.67.1.1 2007/12/27 13:02:25 roberto Exp $
L0003    ** Standard mathematical library
L0004    ** See Copyright Notice in lua.h
L0005    */
L0006    
L0007    
L0008    #include <stdlib.h>
L0009    #include <math.h>
L0010    
L0011    #define lmathlib_c
L0012    #define LUA_LIB
L0013    
L0014    #include "lua.h"
L0015    
L0016    #include "lauxlib.h"
L0017    #include "lualib.h"
L0018    
L0019    
L0020    #undef PI
L0021    #define PI (3.14159265358979323846)
L0022    #define RADIANS_PER_DEGREE (PI/180.0)
L0023    
L0024    
L0025    
L0026    static int math_abs (lua_State *L) {
manl:math.abs
L0027      lua_pushnumber(L, fabs(luaL_checknumber(L, 1)));
L0028      return 1;
L0029    }
L0030    
L0031    static int math_sin (lua_State *L) {
manl:math.sin
L0032      lua_pushnumber(L, sin(luaL_checknumber(L, 1)));
L0033      return 1;
L0034    }
L0035    
L0036    static int math_sinh (lua_State *L) {
manl:math.sinh
L0037      lua_pushnumber(L, sinh(luaL_checknumber(L, 1)));
L0038      return 1;
L0039    }
L0040    
L0041    static int math_cos (lua_State *L) {
manl:math.cos
L0042      lua_pushnumber(L, cos(luaL_checknumber(L, 1)));
L0043      return 1;
L0044    }
L0045    
L0046    static int math_cosh (lua_State *L) {
manl:math.cosh
L0047      lua_pushnumber(L, cosh(luaL_checknumber(L, 1)));
L0048      return 1;
L0049    }
L0050    
L0051    static int math_tan (lua_State *L) {
manl:math.tan
L0052      lua_pushnumber(L, tan(luaL_checknumber(L, 1)));
L0053      return 1;
L0054    }
L0055    
L0056    static int math_tanh (lua_State *L) {
manl:math.tanh
L0057      lua_pushnumber(L, tanh(luaL_checknumber(L, 1)));
L0058      return 1;
L0059    }
L0060    
L0061    static int math_asin (lua_State *L) {
manl:math.asin
L0062      lua_pushnumber(L, asin(luaL_checknumber(L, 1)));
L0063      return 1;
L0064    }
L0065    
L0066    static int math_acos (lua_State *L) {
manl:math.acos
L0067      lua_pushnumber(L, acos(luaL_checknumber(L, 1)));
L0068      return 1;
L0069    }
L0070    
L0071    static int math_atan (lua_State *L) {
manl:math.atan
L0072      lua_pushnumber(L, atan(luaL_checknumber(L, 1)));
L0073      return 1;
L0074    }
L0075    
L0076    static int math_atan2 (lua_State *L) {
L0077      lua_pushnumber(L, atan2(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
L0078      return 1;
L0079    }
L0080    
L0081    static int math_ceil (lua_State *L) {
manl:math.ceil
L0082      lua_pushnumber(L, ceil(luaL_checknumber(L, 1)));
L0083      return 1;
L0084    }
L0085    
L0086    static int math_floor (lua_State *L) {
manl:math.floor
L0087      lua_pushnumber(L, floor(luaL_checknumber(L, 1)));
L0088      return 1;
L0089    }
L0090    
L0091    static int math_fmod (lua_State *L) {
manl:math.fmod
L0092      lua_pushnumber(L, fmod(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
L0093      return 1;
L0094    }
L0095    
L0096    static int math_modf (lua_State *L) {
manl:math.modf
L0097      double ip;
L0098      double fp = modf(luaL_checknumber(L, 1), &ip);
L0099      lua_pushnumber(L, ip);
L0100      lua_pushnumber(L, fp);
L0101      return 2;
L0102    }
L0103    
L0104    static int math_sqrt (lua_State *L) {
manl:math.sqrt
L0105      lua_pushnumber(L, sqrt(luaL_checknumber(L, 1)));
L0106      return 1;
L0107    }
L0108    
L0109    static int math_pow (lua_State *L) {
manl:math.pow
L0110      lua_pushnumber(L, pow(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
L0111      return 1;
L0112    }
L0113    
L0114    static int math_log (lua_State *L) {
manl:math.log
L0115      lua_pushnumber(L, log(luaL_checknumber(L, 1)));
L0116      return 1;
L0117    }
L0118    
L0119    static int math_log10 (lua_State *L) {
L0120      lua_pushnumber(L, log10(luaL_checknumber(L, 1)));
L0121      return 1;
L0122    }
L0123    
L0124    static int math_exp (lua_State *L) {
manl:math.exp
L0125      lua_pushnumber(L, exp(luaL_checknumber(L, 1)));
L0126      return 1;
L0127    }
L0128    
L0129    static int math_deg (lua_State *L) {
manl:math.deg
L0130      lua_pushnumber(L, luaL_checknumber(L, 1)/RADIANS_PER_DEGREE);
L0131      return 1;
L0132    }
L0133    
L0134    static int math_rad (lua_State *L) {
manl:math.rad
L0135      lua_pushnumber(L, luaL_checknumber(L, 1)*RADIANS_PER_DEGREE);
L0136      return 1;
L0137    }
L0138    
L0139    static int math_frexp (lua_State *L) {
manl:math.frexp
L0140      int e;
L0141      lua_pushnumber(L, frexp(luaL_checknumber(L, 1), &e));
L0142      lua_pushinteger(L, e);
L0143      return 2;
L0144    }
L0145    
L0146    static int math_ldexp (lua_State *L) {
manl:math.ldexp
L0147      lua_pushnumber(L, ldexp(luaL_checknumber(L, 1), luaL_checkint(L, 2)));
L0148      return 1;
L0149    }
L0150    
L0151    
L0152    
L0153    static int math_min (lua_State *L) {
manl:math.min
L0154      int n = lua_gettop(L);  /* number of arguments */
L0155      lua_Number dmin = luaL_checknumber(L, 1);
L0156      int i;
L0157      for (i=2; i<=n; i++) {
L0158        lua_Number d = luaL_checknumber(L, i);
L0159        if (d < dmin)
L0160          dmin = d;
L0161      }
L0162      lua_pushnumber(L, dmin);
L0163      return 1;
L0164    }
L0165    
L0166    
L0167    static int math_max (lua_State *L) {
manl:math.max
L0168      int n = lua_gettop(L);  /* number of arguments */
L0169      lua_Number dmax = luaL_checknumber(L, 1);
L0170      int i;
L0171      for (i=2; i<=n; i++) {
L0172        lua_Number d = luaL_checknumber(L, i);
L0173        if (d > dmax)
L0174          dmax = d;
L0175      }
L0176      lua_pushnumber(L, dmax);
L0177      return 1;
L0178    }
L0179    
L0180    
L0181    static int math_random (lua_State *L) {
manl:math.random
L0182      /* the `%' avoids the (rare) case of r==1, and is needed also because on
L0183         some systems (SunOS!) `rand()' may return a value larger than RAND_MAX */
L0184      lua_Number r = (lua_Number)(rand()%RAND_MAX) / (lua_Number)RAND_MAX;
L0185      switch (lua_gettop(L)) {  /* check number of arguments */
L0186        case 0: {  /* no arguments */
L0187          lua_pushnumber(L, r);  /* Number between 0 and 1 */
L0188          break;
L0189        }
L0190        case 1: {  /* only upper limit */
L0191          int u = luaL_checkint(L, 1);
L0192          luaL_argcheck(L, 1<=u, 1, "interval is empty");
L0193          lua_pushnumber(L, floor(r*u)+1);  /* int between 1 and `u' */
L0194          break;
L0195        }
L0196        case 2: {  /* lower and upper limits */
L0197          int l = luaL_checkint(L, 1);
L0198          int u = luaL_checkint(L, 2);
L0199          luaL_argcheck(L, l<=u, 2, "interval is empty");
L0200          lua_pushnumber(L, floor(r*(u-l+1))+l);  /* int between `l' and `u' */
L0201          break;
L0202        }
L0203        default: return luaL_error(L, "wrong number of arguments");
L0204      }
L0205      return 1;
L0206    }
L0207    
L0208    
L0209    static int math_randomseed (lua_State *L) {
manl:math.randomseed
L0210      srand(luaL_checkint(L, 1));
L0211      return 0;
L0212    }
L0213    
L0214    
L0215    static const luaL_Reg mathlib[] = {
L0216      {"abs",   math_abs},
L0217      {"acos",  math_acos},
L0218      {"asin",  math_asin},
L0219      {"atan2", math_atan2},
L0220      {"atan",  math_atan},
L0221      {"ceil",  math_ceil},
L0222      {"cosh",   math_cosh},
L0223      {"cos",   math_cos},
L0224      {"deg",   math_deg},
L0225      {"exp",   math_exp},
L0226      {"floor", math_floor},
L0227      {"fmod",   math_fmod},
L0228      {"frexp", math_frexp},
L0229      {"ldexp", math_ldexp},
L0230      {"log10", math_log10},
L0231      {"log",   math_log},
L0232      {"max",   math_max},
L0233      {"min",   math_min},
L0234      {"modf",   math_modf},
L0235      {"pow",   math_pow},
L0236      {"rad",   math_rad},
L0237      {"random",     math_random},
L0238      {"randomseed", math_randomseed},
L0239      {"sinh",   math_sinh},
L0240      {"sin",   math_sin},
L0241      {"sqrt",  math_sqrt},
L0242      {"tanh",   math_tanh},
L0243      {"tan",   math_tan},
L0244      {NULL, NULL}
L0245    };
L0246    
L0247    
L0248    /*
L0249    ** Open math library
L0250    */
L0251    LUALIB_API int luaopen_math (lua_State *L) {
L0252      luaL_register(L, LUA_MATHLIBNAME, mathlib);
L0253      lua_pushnumber(L, PI);
L0254      lua_setfield(L, -2, "pi");
L0255      lua_pushnumber(L, HUGE_VAL);
L0256      lua_setfield(L, -2, "huge");
L0257    #if defined(LUA_COMPAT_MOD)
L0258      lua_getfield(L, -1, "fmod");
L0259      lua_setfield(L, -2, "mod");
L0260    #endif
L0261      return 1;
L0262    }
L0263