forked from odeke-em/chdkptp
/
luautil.c
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/
luautil.c
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/*
*
* Copyright (C) 2010-2012 <reyalp (at) gmail dot com>
*
* This program 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.
*
* This program 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
misc helper functions to simplify lua API code
*/
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include "luautil.h"
/*
functions to get fields from a table at a specified stack index, similar to luaL_check* and luaL_opt*
throw error on incorrect type, return C value and pop off the stack
*/
void *lu_table_checkudata(lua_State *L, int narg, const char *fname, const char *tname) {
lua_getfield(L, narg, fname);
void *r = luaL_checkudata(L,-1,tname);
lua_pop(L,1);
return r;
}
void *lu_table_optudata(lua_State *L, int narg, const char *fname, const char *tname, void *d) {
void *r;
lua_getfield(L, narg, fname);
if(lua_isnil(L,-1)) {
r=d;
}
else {
r = luaL_checkudata(L,-1,tname);
}
lua_pop(L,1);
return r;
}
lua_Number lu_table_checknumber(lua_State *L, int narg, const char *fname) {
lua_getfield(L, narg, fname);
lua_Number r = luaL_checknumber(L,-1);
lua_pop(L,1);
return r;
}
lua_Number lu_table_optnumber(lua_State *L, int narg, const char *fname, lua_Number d) {
lua_getfield(L, narg, fname);
lua_Number r = luaL_optnumber(L,-1,d);
lua_pop(L,1);
return r;
}
/*
const char *lu_table_checkstring(lua_State *L, int narg, const char *fname) {
lua_getfield(L, narg, fname);
const char *r = luaL_checkstring(L,-1);
lua_pop(L,1);
return r;
}
*/
int lu_table_checkoption(lua_State *L, int narg, const char *fname, const char *def, const char *lst[]) {
lua_getfield(L, narg, fname);
int r = luaL_checkoption(L,-1, def, lst);
lua_pop(L,1);
return r;
}
const char *lu_table_optlstring(lua_State *L, int narg, const char *fname, const char *d, size_t *l) {
lua_getfield(L, narg, fname);
const char *r = luaL_optlstring(L,-1,d,l);
lua_pop(L,1);
return r;
}
/*
like lua_setfield but raw
*/
/*
void lu_rawsetfield(lua_State *L, int index, const char *k) {
// going to push another value
// psuedoindexes start below -LUAI_MAXSTACK
if(index < 0 && index > -LUAI_MAXSTACK)
index--;
lua_pushstring(L,k);
// move key above value for rawset
lua_insert(L,-2);
lua_rawset(L,index);
}
*/