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Finally bothered to add in a method to obtain sector.lines' size internally to prevent going out of bounds.

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Admittedly I knew of this particular method from the start but wanted to avoid it in favour of a less-hacky looking method of getting sector.lines' size ...but there was none to be found at all.
This commit is contained in:
Monster Iestyn 2016-01-20 14:56:52 +00:00
parent 3dc0f2b4ff
commit 79e3e2351d
1 changed files with 14 additions and 13 deletions
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27
src/lua_maplib.c
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@ -268,7 +268,7 @@ static int sectorlines_get(lua_State *L)
{
line_t **seclines = *((line_t ***)luaL_checkudata(L, 1, META_SECTORLINES));
size_t i;
//size_t numoflines;
size_t numoflines = 0;
lua_settop(L, 2);
if (!lua_isnumber(L, 2))
{
@ -286,21 +286,22 @@ static int sectorlines_get(lua_State *L)
}
}
/* \TODO: figure out how to find size of seclines array, rather than the size of a pointer!
Testing for sectors[0].lines in GFZ1 with a test Lua script:
sizeof(seclines) returns 4
sizeof(*seclines) returns 4
sizeof(**seclines) returns 84, presumably the size of line_t
You can probably see why I haven't been successful yet, hopefully
//CONS_Printf("sizeof(seclines): %d\n", sizeof(seclines));
//CONS_Printf("sizeof(seclines[0]): %d\n", sizeof(seclines[0]));*/
// check first linedef to figure which of its sectors owns this sector->lines pointer
// then check that sector's linecount to get a maximum index
//if (!seclines[0])
//return luaL_error(L, "no lines found!"); // no first linedef?????
if (seclines[0]->frontsector->lines == seclines)
numoflines = seclines[0]->frontsector->linecount;
else if (seclines[0]->backsector && seclines[0]->backsector->lines == seclines) // check backsector exists first
numoflines = seclines[0]->backsector->linecount;
//if neither sector has it then ???
/*numoflines = sizeof(seclines) / sizeof(seclines[0]);
if (!numoflines)
return luaL_error(L, "no lines found!");*/
return luaL_error(L, "no lines found!");
i = (size_t)lua_tointeger(L, 2);
/*if (i > numoflines)
return 0;*/
if (i >= numoflines)
return 0;
LUA_PushUserdata(L, seclines[i], META_LINE);
return 1;
}