root/src/lua-5.1.3/src/lmathlib.c

Revision 5c8778c4361d2ad3adc94ef98d804c6fa9e6ba7c, 5.7 kB (checked in by Theo Schlossnagle <jesus@omniti.com>, 10 years ago)

import lua... I'd like to write checkers in lua

  • Property mode set to 100644
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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
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