90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
/*
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* lualib.h - useful functions and type for Lua
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*
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* Copyright © 2009 Julien Danjou <julien@danjou.info>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef AWESOME_COMMON_LUALIB
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#define AWESOME_COMMON_LUALIB
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#include <lauxlib.h>
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#include "common/util.h"
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#define luaA_checkfunction(L, n) \
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do { \
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if(!lua_isfunction(L, n)) \
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luaL_typerror(L, n, "function"); \
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} while(0)
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/** Convert s stack index to positive.
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* \param L The Lua VM state.
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* \param ud The index.
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* \return A positive index.
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*/
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static inline int
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luaA_absindex(lua_State *L, int ud)
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{
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return (ud > 0 || ud <= LUA_REGISTRYINDEX) ? ud : lua_gettop(L) + ud + 1;
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}
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/** Execute an Lua function on top of the stack.
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* \param L The Lua stack.
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* \param nargs The number of arguments for the Lua function.
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* \param nret The number of returned value from the Lua function.
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* \return True on no error, false otherwise.
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*/
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static inline bool
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luaA_dofunction(lua_State *L, int nargs, int nret)
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{
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if(nargs)
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lua_insert(L, - (nargs + 1));
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if(lua_pcall(L, nargs, nret, 0))
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{
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warn("error running function: %s",
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lua_tostring(L, -1));
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lua_pop(L, 1);
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return false;
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}
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return true;
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}
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/** Convert a object to a udata if possible.
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* \param L The Lua VM state.
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* \param ud The index.
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* \param tname The type name.
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* \return A pointer to the object, NULL otherwise.
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*/
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static inline void *
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luaA_toudata(lua_State *L, int ud, const char *tname)
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{
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void *p = lua_touserdata(L, ud);
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if(p) /* value is a userdata? */
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if(lua_getmetatable(L, ud)) /* does it have a metatable? */
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{
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lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get correct metatable */
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if(!lua_rawequal(L, -1, -2)) /* does it have the correct mt? */
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p = NULL;
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lua_pop(L, 2); /* remove both metatables */
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}
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return p;
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}
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#endif
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// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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