1/*	$NetBSD$	*/
2
3/*
4** Id: lmathlib.c,v 1.67.1.1 2007/12/27 13:02:25 roberto Exp
5** Standard mathematical library
6** See Copyright Notice in lua.h
7*/
8
9
10#include <stdlib.h>
11#include <math.h>
12
13#define lmathlib_c
14#define LUA_LIB
15
16#include "lua.h"
17
18#include "lauxlib.h"
19#include "lualib.h"
20
21
22#undef PI
23#define PI (3.14159265358979323846)
24#define RADIANS_PER_DEGREE (PI/180.0)
25
26
27
28static int math_abs (lua_State *L) {
29  lua_pushnumber(L, fabs(luaL_checknumber(L, 1)));
30  return 1;
31}
32
33static int math_sin (lua_State *L) {
34  lua_pushnumber(L, sin(luaL_checknumber(L, 1)));
35  return 1;
36}
37
38static int math_sinh (lua_State *L) {
39  lua_pushnumber(L, sinh(luaL_checknumber(L, 1)));
40  return 1;
41}
42
43static int math_cos (lua_State *L) {
44  lua_pushnumber(L, cos(luaL_checknumber(L, 1)));
45  return 1;
46}
47
48static int math_cosh (lua_State *L) {
49  lua_pushnumber(L, cosh(luaL_checknumber(L, 1)));
50  return 1;
51}
52
53static int math_tan (lua_State *L) {
54  lua_pushnumber(L, tan(luaL_checknumber(L, 1)));
55  return 1;
56}
57
58static int math_tanh (lua_State *L) {
59  lua_pushnumber(L, tanh(luaL_checknumber(L, 1)));
60  return 1;
61}
62
63static int math_asin (lua_State *L) {
64  lua_pushnumber(L, asin(luaL_checknumber(L, 1)));
65  return 1;
66}
67
68static int math_acos (lua_State *L) {
69  lua_pushnumber(L, acos(luaL_checknumber(L, 1)));
70  return 1;
71}
72
73static int math_atan (lua_State *L) {
74  lua_pushnumber(L, atan(luaL_checknumber(L, 1)));
75  return 1;
76}
77
78static int math_atan2 (lua_State *L) {
79  lua_pushnumber(L, atan2(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
80  return 1;
81}
82
83static int math_ceil (lua_State *L) {
84  lua_pushnumber(L, ceil(luaL_checknumber(L, 1)));
85  return 1;
86}
87
88static int math_floor (lua_State *L) {
89  lua_pushnumber(L, floor(luaL_checknumber(L, 1)));
90  return 1;
91}
92
93static int math_fmod (lua_State *L) {
94  lua_pushnumber(L, fmod(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
95  return 1;
96}
97
98static int math_modf (lua_State *L) {
99  double ip;
100  double fp = modf(luaL_checknumber(L, 1), &ip);
101  lua_pushnumber(L, ip);
102  lua_pushnumber(L, fp);
103  return 2;
104}
105
106static int math_sqrt (lua_State *L) {
107  lua_pushnumber(L, sqrt(luaL_checknumber(L, 1)));
108  return 1;
109}
110
111static int math_pow (lua_State *L) {
112  lua_pushnumber(L, pow(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
113  return 1;
114}
115
116static int math_log (lua_State *L) {
117  lua_pushnumber(L, log(luaL_checknumber(L, 1)));
118  return 1;
119}
120
121static int math_log10 (lua_State *L) {
122  lua_pushnumber(L, log10(luaL_checknumber(L, 1)));
123  return 1;
124}
125
126static int math_exp (lua_State *L) {
127  lua_pushnumber(L, exp(luaL_checknumber(L, 1)));
128  return 1;
129}
130
131static int math_deg (lua_State *L) {
132  lua_pushnumber(L, luaL_checknumber(L, 1)/RADIANS_PER_DEGREE);
133  return 1;
134}
135
136static int math_rad (lua_State *L) {
137  lua_pushnumber(L, luaL_checknumber(L, 1)*RADIANS_PER_DEGREE);
138  return 1;
139}
140
141static int math_frexp (lua_State *L) {
142  int e;
143  lua_pushnumber(L, frexp(luaL_checknumber(L, 1), &e));
144  lua_pushinteger(L, e);
145  return 2;
146}
147
148static int math_ldexp (lua_State *L) {
149  lua_pushnumber(L, ldexp(luaL_checknumber(L, 1), luaL_checkint(L, 2)));
150  return 1;
151}
152
153
154
155static int math_min (lua_State *L) {
156  int n = lua_gettop(L);  /* number of arguments */
157  lua_Number dmin = luaL_checknumber(L, 1);
158  int i;
159  for (i=2; i<=n; i++) {
160    lua_Number d = luaL_checknumber(L, i);
161    if (d < dmin)
162      dmin = d;
163  }
164  lua_pushnumber(L, dmin);
165  return 1;
166}
167
168
169static int math_max (lua_State *L) {
170  int n = lua_gettop(L);  /* number of arguments */
171  lua_Number dmax = luaL_checknumber(L, 1);
172  int i;
173  for (i=2; i<=n; i++) {
174    lua_Number d = luaL_checknumber(L, i);
175    if (d > dmax)
176      dmax = d;
177  }
178  lua_pushnumber(L, dmax);
179  return 1;
180}
181
182
183static int math_random (lua_State *L) {
184  /* the `%' avoids the (rare) case of r==1, and is needed also because on
185     some systems (SunOS!) `rand()' may return a value larger than RAND_MAX */
186  lua_Number r = (lua_Number)(rand()%RAND_MAX) / (lua_Number)RAND_MAX;
187  switch (lua_gettop(L)) {  /* check number of arguments */
188    case 0: {  /* no arguments */
189      lua_pushnumber(L, r);  /* Number between 0 and 1 */
190      break;
191    }
192    case 1: {  /* only upper limit */
193      int u = luaL_checkint(L, 1);
194      luaL_argcheck(L, 1<=u, 1, "interval is empty");
195      lua_pushnumber(L, floor(r*u)+1);  /* int between 1 and `u' */
196      break;
197    }
198    case 2: {  /* lower and upper limits */
199      int l = luaL_checkint(L, 1);
200      int u = luaL_checkint(L, 2);
201      luaL_argcheck(L, l<=u, 2, "interval is empty");
202      lua_pushnumber(L, floor(r*(u-l+1))+l);  /* int between `l' and `u' */
203      break;
204    }
205    default: return luaL_error(L, "wrong number of arguments");
206  }
207  return 1;
208}
209
210
211static int math_randomseed (lua_State *L) {
212  srand(luaL_checkint(L, 1));
213  return 0;
214}
215
216
217static const luaL_Reg mathlib[] = {
218  {"abs",   math_abs},
219  {"acos",  math_acos},
220  {"asin",  math_asin},
221  {"atan2", math_atan2},
222  {"atan",  math_atan},
223  {"ceil",  math_ceil},
224  {"cosh",   math_cosh},
225  {"cos",   math_cos},
226  {"deg",   math_deg},
227  {"exp",   math_exp},
228  {"floor", math_floor},
229  {"fmod",   math_fmod},
230  {"frexp", math_frexp},
231  {"ldexp", math_ldexp},
232  {"log10", math_log10},
233  {"log",   math_log},
234  {"max",   math_max},
235  {"min",   math_min},
236  {"modf",   math_modf},
237  {"pow",   math_pow},
238  {"rad",   math_rad},
239  {"random",     math_random},
240  {"randomseed", math_randomseed},
241  {"sinh",   math_sinh},
242  {"sin",   math_sin},
243  {"sqrt",  math_sqrt},
244  {"tanh",   math_tanh},
245  {"tan",   math_tan},
246  {NULL, NULL}
247};
248
249
250/*
251** Open math library
252*/
253LUALIB_API int luaopen_math (lua_State *L) {
254  luaL_register(L, LUA_MATHLIBNAME, mathlib);
255  lua_pushnumber(L, PI);
256  lua_setfield(L, -2, "pi");
257  lua_pushnumber(L, HUGE_VAL);
258  lua_setfield(L, -2, "huge");
259#if defined(LUA_COMPAT_MOD)
260  lua_getfield(L, -1, "fmod");
261  lua_setfield(L, -2, "mod");
262#endif
263  return 1;
264}
265
266