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/*
* Author: Christian Storm
* Copyright (C) 2017, Siemens AG
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include <lua.h>
#include "lua_compat.h"
/*
* These LuaJIT/Lua 5.1 compatibility functions are taken from
* https://github.com/keplerproject/lua-compat-5.2
*/
#if !defined(LUA_VERSION_NUM) || LUA_VERSION_NUM == 501
char *luaL_prepbuffsize(luaL_Buffer_52 *B, size_t s)
{
if (B->capacity - B->nelems < s) { /* needs to grow */
char* newptr = NULL;
size_t newcap = B->capacity * 2;
if (newcap - B->nelems < s)
newcap = B->nelems + s;
if (newcap < B->capacity) /* overflow */
luaL_error(B->L2, "buffer too large");
newptr = lua_newuserdata(B->L2, newcap);
memcpy(newptr, B->ptr, B->nelems);
if (B->ptr != B->b.buffer)
lua_replace(B->L2, -2); /* remove old buffer */
B->ptr = newptr;
B->capacity = newcap;
}
return B->ptr+B->nelems;
}
void luaL_buffinit(lua_State *L, luaL_Buffer_52 *B)
{
/* make it crash if used via pointer to a 5.1-style luaL_Buffer */
B->b.p = NULL;
B->b.L = NULL;
B->b.lvl = 0;
/* reuse the buffer from the 5.1-style luaL_Buffer though! */
B->ptr = B->b.buffer;
B->capacity = LUAL_BUFFERSIZE;
B->nelems = 0;
B->L2 = L;
}
void luaL_pushresult(luaL_Buffer_52 *B)
{
lua_pushlstring(B->L2, B->ptr, B->nelems);
if (B->ptr != B->b.buffer)
lua_replace(B->L2, -2); /* remove userdata buffer */
}
void luaL_setfuncs(lua_State *L, const luaL_Reg *l, int nup)
{
luaL_checkstack(L, nup+1, "too many upvalues");
for (; l->name != NULL; l++) { /* fill the table with given functions */
int i;
lua_pushstring(L, l->name);
for (i = 0; i < nup; i++) /* copy upvalues to the top */
lua_pushvalue(L, -(nup + 1));
lua_pushcclosure(L, l->func, nup); /* closure with those upvalues */
lua_settable(L, -(nup + 3)); /* table must be below the upvalues, the name and the closure */
}
lua_pop(L, nup); /* remove upvalues */
}
void luaL_requiref(lua_State *L, char const* modname, lua_CFunction openf, int glb)
{
luaL_checkstack(L, 3, "not enough stack slots");
lua_pushcfunction(L, openf);
lua_pushstring(L, modname);
lua_call(L, 1, 1);
lua_getglobal(L, "package");
lua_getfield(L, -1, "loaded");
lua_replace(L, -2);
lua_pushvalue(L, -2);
lua_setfield(L, -2, modname);
lua_pop(L, 1);
if (glb) {
lua_pushvalue(L, -1);
lua_setglobal(L, modname);
}
}
#endif
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