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Fix leak and possible segfault in minetest.set_mapgen_params
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@kwolekr
kwolekr committed Dec 8, 2013
1 parent 83cc882 commit 3cc45fd
Showing 1 changed file with 42 additions and 40 deletions.
82 changes: 42 additions & 40 deletions src/script/lua_api/l_mapgen.cpp
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Expand Up @@ -81,45 +81,45 @@ struct EnumString ModApiMapgen::es_Rotation[] =
int ModApiMapgen::l_get_mapgen_object(lua_State *L)
{
const char *mgobjstr = lua_tostring(L, 1);

int mgobjint;
if (!string_to_enum(es_MapgenObject, mgobjint, mgobjstr ? mgobjstr : ""))
return 0;

enum MapgenObject mgobj = (MapgenObject)mgobjint;

EmergeManager *emerge = getServer(L)->getEmergeManager();
Mapgen *mg = emerge->getCurrentMapgen();
if (!mg)
return 0;

size_t maplen = mg->csize.X * mg->csize.Z;

int nargs = 1;

switch (mgobj) {
case MGOBJ_VMANIP: {
ManualMapVoxelManipulator *vm = mg->vm;

// VoxelManip object
LuaVoxelManip *o = new LuaVoxelManip(vm, true);
*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
luaL_getmetatable(L, "VoxelManip");
lua_setmetatable(L, -2);

// emerged min pos
push_v3s16(L, vm->m_area.MinEdge);

// emerged max pos
push_v3s16(L, vm->m_area.MaxEdge);

nargs = 3;

break; }
case MGOBJ_HEIGHTMAP: {
if (!mg->heightmap)
return 0;

lua_newtable(L);
for (size_t i = 0; i != maplen; i++) {
lua_pushinteger(L, mg->heightmap[i]);
Expand All @@ -129,7 +129,7 @@ int ModApiMapgen::l_get_mapgen_object(lua_State *L)
case MGOBJ_BIOMEMAP: {
if (!mg->biomemap)
return 0;

lua_newtable(L);
for (size_t i = 0; i != maplen; i++) {
lua_pushinteger(L, mg->biomemap[i]);
Expand All @@ -140,22 +140,22 @@ int ModApiMapgen::l_get_mapgen_object(lua_State *L)
case MGOBJ_HUMIDMAP:
if (strcmp(emerge->params->mg_name.c_str(), "v7"))
return 0;

MapgenV7 *mgv7 = (MapgenV7 *)mg;

float *arr = (mgobj == MGOBJ_HEATMAP) ?
float *arr = (mgobj == MGOBJ_HEATMAP) ?
mgv7->noise_heat->result : mgv7->noise_humidity->result;
if (!arr)
return 0;

lua_newtable(L);
for (size_t i = 0; i != maplen; i++) {
lua_pushnumber(L, arr[i]);
lua_rawseti(L, -2, i + 1);
}
break; }
}

return nargs;
}

Expand All @@ -167,25 +167,25 @@ int ModApiMapgen::l_set_mapgen_params(lua_State *L)
return 0;

EmergeManager *emerge = getServer(L)->getEmergeManager();
if (emerge->mapgen.size())
if (!emerge || emerge->mapgen.size())
return 0;

MapgenParams *oparams = new MapgenParams;
u32 paramsmodified = 0;
u32 flagmask = 0;

lua_getfield(L, 1, "mgname");
if (lua_isstring(L, -1)) {
oparams->mg_name = std::string(lua_tostring(L, -1));
paramsmodified |= MGPARAMS_SET_MGNAME;
}

lua_getfield(L, 1, "seed");
if (lua_isnumber(L, -1)) {
oparams->seed = lua_tointeger(L, -1);
paramsmodified |= MGPARAMS_SET_SEED;
}

lua_getfield(L, 1, "water_level");
if (lua_isnumber(L, -1)) {
oparams->water_level = lua_tointeger(L, -1);
Expand All @@ -197,18 +197,20 @@ int ModApiMapgen::l_set_mapgen_params(lua_State *L)
std::string flagstr = std::string(lua_tostring(L, -1));
oparams->flags = readFlagString(flagstr, flagdesc_mapgen);
paramsmodified |= MGPARAMS_SET_FLAGS;

lua_getfield(L, 1, "flagmask");
if (lua_isstring(L, -1)) {
flagstr = std::string(lua_tostring(L, -1));
flagmask = readFlagString(flagstr, flagdesc_mapgen);
}
}


delete emerge->luaoverride_params;

emerge->luaoverride_params = oparams;
emerge->luaoverride_params_modified = paramsmodified;
emerge->luaoverride_flagmask = flagmask;

return 0;
}

Expand Down Expand Up @@ -240,7 +242,7 @@ int ModApiMapgen::l_register_biome(lua_State *L)
"air");
b->nname_dust_water = getstringfield_default(L, index, "node_dust_water",
"mapgen_water_source");

b->depth_top = getintfield_default(L, index, "depth_top", 1);
b->depth_filler = getintfield_default(L, index, "depth_filler", 3);
b->height_min = getintfield_default(L, index, "height_min", 0);
Expand All @@ -254,7 +256,7 @@ int ModApiMapgen::l_register_biome(lua_State *L)
b->c_water = CONTENT_IGNORE;
b->c_dust = CONTENT_IGNORE;
b->c_dust_water = CONTENT_IGNORE;

verbosestream << "register_biome: " << b->name << std::endl;
bmgr->addBiome(b);

Expand All @@ -277,7 +279,7 @@ int ModApiMapgen::l_register_decoration(lua_State *L)
"decoration placement type";
return 0;
}

Decoration *deco = createDecoration(decotype);
if (!deco) {
errorstream << "register_decoration: decoration placement type "
Expand All @@ -295,11 +297,11 @@ int ModApiMapgen::l_register_decoration(lua_State *L)
delete deco;
return 0;
}

lua_getfield(L, index, "noise_params");
deco->np = read_noiseparams(L, -1);
lua_pop(L, 1);

lua_getfield(L, index, "biomes");
if (lua_istable(L, -1)) {
lua_pushnil(L);
Expand All @@ -313,7 +315,7 @@ int ModApiMapgen::l_register_decoration(lua_State *L)
}
lua_pop(L, 1);
}

switch (decotype) {
case DECO_SIMPLE: {
DecoSimple *dsimple = (DecoSimple *)deco;
Expand All @@ -323,7 +325,7 @@ int ModApiMapgen::l_register_decoration(lua_State *L)
dsimple->deco_height = getintfield_default(L, index, "height", 1);
dsimple->deco_height_max = getintfield_default(L, index, "height_max", 0);
dsimple->nspawnby = getintfield_default(L, index, "num_spawn_by", -1);

lua_getfield(L, index, "decoration");
if (lua_istable(L, -1)) {
lua_pushnil(L);
Expand All @@ -340,7 +342,7 @@ int ModApiMapgen::l_register_decoration(lua_State *L)
dsimple->deco_name = std::string("air");
}
lua_pop(L, 1);

if (dsimple->deco_height <= 0) {
errorstream << "register_decoration: simple decoration height"
" must be greater than 0" << std::endl;
Expand Down Expand Up @@ -380,7 +382,7 @@ int ModApiMapgen::l_register_decoration(lua_State *L)
return 0;
}
lua_pop(L, -1);

if (!dschem->filename.empty() && !dschem->loadSchematicFile()) {
errorstream << "register_decoration: failed to load schematic file '"
<< dschem->filename << "'" << std::endl;
Expand All @@ -390,7 +392,7 @@ int ModApiMapgen::l_register_decoration(lua_State *L)
break; }
case DECO_LSYSTEM: {
//DecoLSystem *decolsystem = (DecoLSystem *)deco;

break; }
}

Expand Down Expand Up @@ -474,7 +476,7 @@ int ModApiMapgen::l_create_schematic(lua_State *L)
v3s16 p1 = read_v3s16(L, 1);
v3s16 p2 = read_v3s16(L, 2);
sortBoxVerticies(p1, p2);

std::vector<std::pair<v3s16, u8> > prob_list;
if (lua_istable(L, 3)) {
lua_pushnil(L);
Expand All @@ -483,15 +485,15 @@ int ModApiMapgen::l_create_schematic(lua_State *L)
lua_getfield(L, -1, "pos");
v3s16 pos = read_v3s16(L, -1);
lua_pop(L, 1);

u8 prob = getintfield_default(L, -1, "prob", MTSCHEM_PROB_ALWAYS);
prob_list.push_back(std::make_pair(pos, prob));
}

lua_pop(L, 1);
}
}

std::vector<std::pair<s16, u8> > slice_prob_list;
if (lua_istable(L, 5)) {
lua_pushnil(L);
Expand All @@ -516,7 +518,7 @@ int ModApiMapgen::l_create_schematic(lua_State *L)
}

dschem.applyProbabilities(p1, &prob_list, &slice_prob_list);

dschem.saveSchematicFile(ndef);
actionstream << "create_schematic: saved schematic file '"
<< dschem.filename << "'." << std::endl;
Expand All @@ -536,11 +538,11 @@ int ModApiMapgen::l_place_schematic(lua_State *L)
v3s16 p = read_v3s16(L, 1);
if (!read_schematic(L, 2, &dschem, getServer(L)))
return 0;

int rot = ROTATE_0;
if (lua_isstring(L, 3))
string_to_enum(es_Rotation, rot, std::string(lua_tostring(L, 3)));

dschem.rotation = (Rotation)rot;

if (lua_istable(L, 4)) {
Expand Down Expand Up @@ -568,7 +570,7 @@ int ModApiMapgen::l_place_schematic(lua_State *L)
}
dschem.resolveNodeNames(ndef);
}

dschem.placeStructure(map, p);

return 1;
Expand Down

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