/* $NetBSD: libm.c,v 1.2 2022/11/23 18:15:43 christos Exp $     */

/*-
* Copyright (c) 2022 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Phillip Rulon
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: libm.c,v 1.2 2022/11/23 18:15:43 christos Exp $");

#include <lua.h>
#include <lauxlib.h>
#include <math.h>

const char      badarg[] = "argument to libm function not a number";

/*-
* The majority of libm functions fall into a few forms:
*
*   int func(double);
*   double func(double);
*   double func(double, double);
* and,
*   double func(int, double);
*
* Accordingly, this lends itself to systematic declaration of the lua
* interface functions.  These macros set this up.
*/
#define BFUNC_DBL(fname)                        \
static int                                      \
libm_##fname(lua_State *L)                      \
{                                               \
       if (!lua_isnumber(L, 1))                \
               return luaL_error(L, badarg);   \
                                               \
       double x = lua_tonumber(L, 1);          \
       lua_pushboolean(L, fname(x));           \
       return 1;                               \
}

#define DFUNC_DBL(fname)                        \
static int                                      \
libm_##fname(lua_State *L)                      \
{                                               \
       if (!lua_isnumber(L, 1))                \
               return luaL_error(L, badarg);   \
                                               \
       double x = lua_tonumber(L, 1);          \
       lua_pushnumber(L, fname(x));            \
       return 1;                               \
}

#define DFUNC_INT_DBL(fname)                    \
static int                                      \
libm_##fname(lua_State *L)                      \
{                                               \
       if (!lua_isinteger(L, 1) ||             \
           !lua_isnumber(L, 2))                \
               return luaL_error(L, badarg);   \
                                               \
       int i = (int)lua_tointeger(L, 1);       \
       double x = lua_tonumber(L, 2);          \
       lua_pushnumber(L, fname(i, x));         \
       return 1;                               \
}

#define DFUNC_DBL_DBL(fname)                    \
static int                                      \
libm_##fname(lua_State *L)                      \
{                                               \
       if (!lua_isnumber(L, 1) ||              \
           !lua_isnumber(L, 2))                \
               return luaL_error(L, badarg);   \
       double x[] = {                          \
           lua_tonumber(L, 1),                 \
           lua_tonumber(L,2)                   \
       };                                      \
       lua_pushnumber(L, fname(x[0], x[1]));   \
       return 1;                               \
}

int     luaopen_libm(lua_State *);

DFUNC_DBL(acos)
DFUNC_DBL(acosh)
DFUNC_DBL(asin)
DFUNC_DBL(asinh)
DFUNC_DBL(atan)
DFUNC_DBL(atanh)
DFUNC_DBL_DBL(atan2)
DFUNC_DBL(cbrt)
DFUNC_DBL(ceil)
DFUNC_DBL_DBL(copysign)
DFUNC_DBL(cos)
DFUNC_DBL(cosh)
DFUNC_DBL(erf)
DFUNC_DBL(erfc)
DFUNC_DBL(exp)
DFUNC_DBL(exp2)
DFUNC_DBL(expm1)
DFUNC_DBL(fabs)
DFUNC_DBL_DBL(fdim)
BFUNC_DBL(finite)
DFUNC_DBL(floor)
DFUNC_DBL_DBL(fmax)
DFUNC_DBL_DBL(fmin)
DFUNC_DBL_DBL(fmod)
DFUNC_DBL(gamma)
DFUNC_DBL_DBL(hypot)
BFUNC_DBL(isfinite)
BFUNC_DBL(isnan)
BFUNC_DBL(isinf)
DFUNC_DBL(j0)
DFUNC_DBL(j1)
DFUNC_INT_DBL(jn)
DFUNC_DBL(lgamma)
DFUNC_DBL(log)
DFUNC_DBL(log10)
DFUNC_DBL(log1p)
#ifndef __vax__
DFUNC_DBL_DBL(nextafter)
#endif
DFUNC_DBL_DBL(pow)
DFUNC_DBL_DBL(remainder)
DFUNC_DBL(rint)
DFUNC_DBL(round)
DFUNC_DBL(sin)
DFUNC_DBL(sinh)
DFUNC_DBL(sqrt)
DFUNC_DBL(tan)
DFUNC_DBL(tanh)
DFUNC_DBL(trunc)
DFUNC_DBL(y0)
DFUNC_DBL(y1)
DFUNC_INT_DBL(yn)

/*
* The following interface functions are special cases which do not lend
* themseleves to the systematic declaration scheme above.
*/
static int
libm_fma(lua_State *L)
{
       if (!lua_isnumber(L, 1) ||
           !lua_isnumber(L, 2) ||
           !lua_isnumber(L, 3))
               return luaL_error(L, badarg);

       double  x[] = {
           lua_tonumber(L, 1),
           lua_tonumber(L, 2),
           lua_tonumber(L, 3)
       };
       lua_pushnumber(L, fma(x[0], x[1], x[2]));
       return 1;
}

static int
libm_nan(lua_State *L)
{
       if (!lua_isstring(L, 1))
               return luaL_error(L, badarg);

       const char     *str = luaL_checkstring(L, 1);
       lua_pushnumber(L, nan(str));
       return 1;
}

static int
libm_scalbn(lua_State *L)
{
       if (!lua_isnumber(L, 1) || !lua_isinteger(L, 2))
               return luaL_error(L, badarg);

       double          x = lua_tonumber(L, 1);
       int             i = (int)lua_tointeger(L, 2);
       lua_pushnumber(L, scalbn(x, i));
       return 1;
}

static int
libm_ilogb(lua_State *L)
{
       if (!lua_isnumber(L, 1))
               return luaL_error(L, badarg);

       double          x = lua_tonumber(L, 1);
       lua_pushinteger(L, ilogb(x));
       return 1;
}

/*
* set up a table for the math.h constants
*/
#define LIBM_CONST(K) {#K, K}
struct kv {
       const char     *k;
       double          v;
};

static const struct kv libm_const[] = {
       LIBM_CONST(M_E),
       LIBM_CONST(M_LOG2E),
       LIBM_CONST(M_LOG10E),
       LIBM_CONST(M_LN2),
       LIBM_CONST(M_LN10),
       LIBM_CONST(M_PI),
       LIBM_CONST(M_PI_2),
       LIBM_CONST(M_PI_4),
       LIBM_CONST(M_1_PI),
       LIBM_CONST(M_2_PI),
       LIBM_CONST(M_2_SQRTPI),
       LIBM_CONST(M_SQRT2),
       LIBM_CONST(M_SQRT1_2),
       { NULL, 0 }
};


static const struct luaL_Reg lualibm[] = {
       { "acos", libm_acos },
       { "acosh", libm_acosh },
       { "asin", libm_asin },
       { "asinh", libm_asinh },
       { "atan", libm_atan },
       { "atanh", libm_atanh },
       { "atan2", libm_atan2 },
       { "cbrt", libm_cbrt },
       { "ceil", libm_ceil },
       { "copysign", libm_copysign },
       { "cos", libm_cos },
       { "cosh", libm_cosh },
       { "erf", libm_erf },
       { "erfc", libm_erfc },
       { "exp", libm_exp },
       { "exp2", libm_exp2 },
       { "expm1", libm_expm1 },
       { "fabs", libm_fabs },
       { "fdim", libm_fdim },
       { "finite", libm_finite },
       { "floor", libm_floor },
       { "fma", libm_fma },
       { "fmax", libm_fmax },
       { "fmin", libm_fmin },
       { "fmod", libm_fmod },
       { "gamma", libm_gamma },
       { "hypot", libm_hypot },
       { "ilogb", libm_ilogb },
       { "isfinite", libm_isfinite },
       { "isinf", libm_isinf },
       { "isnan", libm_isnan },
       { "j0", libm_j0 },
       { "j1", libm_j1 },
       { "jn", libm_jn },
       { "lgamma", libm_lgamma },
       { "log", libm_log },
       { "log10", libm_log10 },
       { "log1p", libm_log1p },
       { "nan", libm_nan },
#ifndef __vax__
       { "nextafter", libm_nextafter },
#endif
       { "pow", libm_pow },
       { "remainder", libm_remainder },
       { "rint", libm_rint },
       { "round", libm_round },
       { "scalbn", libm_scalbn },
       { "sin", libm_sin },
       { "sinh", libm_sinh },
       { "sqrt", libm_sqrt },
       { "tan", libm_tan },
       { "tanh", libm_tanh },
       { "trunc", libm_trunc },
       { "y0", libm_y0 },
       { "y1", libm_y1 },
       { "yn", libm_yn },
       { NULL, NULL }
};

int
luaopen_libm(lua_State *L)
{
       const struct kv *kvp = libm_const;

       luaL_newlib(L, lualibm);

       /* integrate the math.h constants */
       while (kvp->k) {
               lua_pushnumber(L, kvp->v);
               lua_setfield(L, -2, kvp->k);
               kvp++;
       }

       return 1;
}

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