Lua: add parts of the math library (all floating point functions are #ifdef'ed out)

Flyspray: FS#10389
Author: myself

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23321 a1c6a512-1295-4272-9138-f99709370657

3 files changed, 287 insertions, 0 deletions

diff --git a/apps/plugins/lua/SOURCES b/apps/plugins/lua/SOURCES
index 56c029921d..d475783c7a 100644
--- a/apps/plugins/lua/SOURCES
+++ b/apps/plugins/lua/SOURCES
@@ -10,6 +10,7 @@ lfunc.c
 lgc.c
 liolib.c
 llex.c
+lmathlib.c
 lmem.c
 loadlib.c
 lobject.c
diff --git a/apps/plugins/lua/lmathlib.c b/apps/plugins/lua/lmathlib.c
new file mode 100644
index 0000000000..99a104050c
--- /dev/null
+++ b/apps/plugins/lua/lmathlib.c
@@ -0,0 +1,285 @@
+/*
+** $Id: lmathlib.c,v 1.67.1.1 2007/12/27 13:02:25 roberto Exp $
+** Standard mathematical library
+** See Copyright Notice in lua.h
+*/
+
+
+#if 0
+#include <stdlib.h>
+#include <math.h>
+#endif
+
+#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)
+#define DEGREES_PER_RADIAN (180.0/PI)
+
+
+static int math_abs (lua_State *L) {
+  /* Was: lua_pushnumber(L, fabs(luaL_checknumber(L, 1))); */
+  lua_Number n = luaL_checknumber(L, 1);
+  lua_pushnumber(L, n < 0 ? -n : n);
+  return 1;
+}
+
+#if 0
+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;
+}
+#endif
+
+static int math_ceil (lua_State *L) {
+  /* Doesn't change anything in fixed point arithmetic */
+  lua_pushnumber(L, luaL_checknumber(L, 1));
+  return 1;
+}
+
+static int math_floor (lua_State *L) {
+  /* Doesn't change anything in fixed point arithmetic */
+  lua_pushnumber(L, luaL_checknumber(L, 1));
+  return 1;
+}
+
+static int math_fmod (lua_State *L) {
+  /* Was: lua_pushnumber(L, fmod(luaL_checknumber(L, 1), luaL_checknumber(L, 2))); */
+  lua_pushnumber(L, luaL_checknumber(L, 1) % luaL_checknumber(L, 2));
+  return 1;
+}
+
+#if 0
+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;
+}
+#endif
+static int math_deg (lua_State *L) {
+  lua_pushnumber(L, luaL_checknumber(L, 1)*DEGREES_PER_RADIAN);
+  return 1;
+}
+static int math_rad (lua_State *L) {
+  lua_pushnumber(L, (luaL_checknumber(L, 1)*100)/(DEGREES_PER_RADIAN*100));
+  return 1;
+}
+
+#if 0
+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;
+}
+#endif
+
+
+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) {
+  /* We're not SunOS */
+  lua_Number r = (lua_Number)(rb->rand());
+  switch (lua_gettop(L)) {  /* check number of arguments */
+    case 0: {  /* no arguments */
+      lua_pushnumber(L, r);  /* Number between 0 and RAND_MAX */
+      break;
+    }
+    case 1: {  /* only upper limit */
+      int u = luaL_checkint(L, 1);
+      luaL_argcheck(L, 1<=u, 1, "interval is empty");
+      lua_pushnumber(L, 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, 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) {
+  rb->srand(luaL_checkint(L, 1));
+  return 0;
+}
+
+
+static const luaL_Reg mathlib[] = {
+  {"abs",   math_abs},
+#if 0
+  {"acos",  math_acos},
+  {"asin",  math_asin},
+  {"atan2", math_atan2},
+  {"atan",  math_atan},
+#endif
+  {"ceil",  math_ceil},
+#if 0
+  {"cosh",  math_cosh},
+  {"cos",   math_cos},
+#endif
+  {"deg",   math_deg},
+#if 0
+  {"exp",   math_exp},
+#endif
+  {"floor", math_floor},
+  {"fmod",  math_fmod},
+#if 0
+  {"frexp", math_frexp},
+  {"ldexp", math_ldexp},
+  {"log10", math_log10},
+  {"log",   math_log},
+#endif
+  {"max",   math_max},
+  {"min",   math_min},
+#if 0
+  {"modf",  math_modf},
+  {"pow",   math_pow},
+#endif
+  {"rad",   math_rad},
+  {"random",     math_random},
+  {"randomseed", math_randomseed},
+#if 0
+  {"sinh",  math_sinh},
+  {"sin",   math_sin},
+  {"sqrt",  math_sqrt},
+  {"tanh",  math_tanh},
+  {"tan",   math_tan},
+#endif
+  {NULL, NULL}
+};
+
+
+/*
+** Open math library
+*/
+LUALIB_API int luaopen_math (lua_State *L) {
+  luaL_register(L, LUA_MATHLIBNAME, mathlib);
+#if 0 /* No use in adding floating point constants when there's no FP */
+  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
+#endif
+  return 1;
+}
diff --git a/apps/plugins/lua/rocklua.c b/apps/plugins/lua/rocklua.c
index 266fa4305e..395cde8d9d 100644
--- a/apps/plugins/lua/rocklua.c
+++ b/apps/plugins/lua/rocklua.c
@@ -38,6 +38,7 @@ static const luaL_Reg lualibs[] = {
   {LUA_BITLIBNAME,  luaopen_bit},
   {LUA_IOLIBNAME,   luaopen_io},
   {LUA_LOADLIBNAME, luaopen_package},
+  {LUA_MATHLIBNAME, luaopen_math},
   {NULL, NULL}
 };