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check the number of arguments passed to C from Lua.
#include <luasup/luasup.h>int slua_check_n_arg( SLua_ErrFunc errfunc, const char *func, int n );
SLua_ErrFunc errfunc
- Not Documented.
const char *func
- the name of the lua function
int n
- the number of arguments expected
This routine compares the number of arguments expected (passed via
the n
parameter) to the actual number of arguments passed
to the C function by Lua. It's a simple wrapper around
lua_getparam
.
If the number of arguments matches is not less than that passed via
n
, it returns zero. If there are fewer arguments than
expected, it calls the supplied error function and returns -1.
Diab Jerius
/* --8<--8<--8<--8<-- * * Copyright (C) 2006 Smithsonian Astrophysical Observatory * * This file is part of luasup * * luasup is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * luasup is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the * Free Software Foundation, Inc. * 51 Franklin Street, Fifth Floor * Boston, MA 02110-1301, USA * * -->8-->8-->8-->8-- */ #include <stddef.h> #include <stdarg.h> #include <luasup.h> extern SLua_ErrFunc errfunc; void foo ( void ) { char *name; double energy, base_flux; slua_args_n( errfunc, "mono flux generator", 1, "name", SLua_STRING, &name, "energy", SLua_NUMBER, &energy, "photon flux", SLua_NUMBER, &base_flux, NULL ); free( name ); slua_args_n( errfunc, "mono flux generator", 4, "name", SLua_STRING, &name, "energy", SLua_NUMBER, &energy, "photon flux", SLua_NUMBER, &base_flux, NULL ); free( name ); }