75 lines
3.1 KiB
C
75 lines
3.1 KiB
C
/*
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* Copyright (c) 2019 the NodeMCU authors. All rights reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of the copyright holders nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @author Javier Peletier <jm@epiclabs.io>
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* @brief This library exports useful functions to handle lua registry refs and strings
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*/
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#ifndef _NODEMCU_LNODEAUX_H_
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#define _NODEMCU_LNODEAUX_H_
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#include "lua.h"
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#include <stdbool.h>
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// lua_ref_t represents a reference to a lua object in the registry
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typedef int lua_ref_t;
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//luaX_weak_ref pops an item from the stack and returns a weak reference to it
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lua_ref_t luaX_weak_ref(lua_State* L);
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//luaL_push_weak takes a weak reference and pushes the original item on the stack
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void luaX_push_weak_ref(lua_State* L, lua_ref_t ref);
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// luaX_alloc_string creates a dynamically-allocated null-terminated string copying it
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// from a lua stack position
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char* luaX_alloc_string(lua_State* L, int idx, int max_length);
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// luaX_free_string deallocates memory of a string allocated with luaX_alloc_string
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void luaX_free_string(lua_State* L, char* st);
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// luaX_unset_ref unpins a reference to a lua object in the registry
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void luaX_unset_ref(lua_State* L, lua_ref_t* ref);
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// luaX_set_ref pins a reference to a lua object, provided a registry
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// or stack position
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void luaX_set_ref(lua_State* L, int idx, lua_ref_t* ref);
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// luaX_valid_ref returns true if the reference is set.
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inline bool luaX_valid_ref(lua_ref_t ref) {
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return ref > 0;
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}
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// luaX_pushlstring is the same as lua_pushlstring except it will return nonzero in case of error
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// (instead of throwing an exception and never returning) and will put the error message on the top of the stack.
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int luaX_pushlstring(lua_State* L, const char* s, size_t l);
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#endif
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