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