Function tconcat

Source/Misc/lua/src/lua.c:14690–14707

static int tconcat (lua_State *L) {
luaL_Buffer b;
size_t lsep;
int i, last;
const char *sep = luaL_optlstring(L, 2, "", &lsep);
luaL_checktype(L, 1, LUA_TTABLE);
i = luaL_optint(L, 3, 1);
last = luaL_opt(L, luaL_checkint, 4, luaL_getn(L, 1));
luaL_buffinit(L, &b);
for (; i < last; i++) {
addfield(L, &b, i);
luaL_addlstring(&b, sep, lsep);
}
if (i == last)  /* add last value (if interval was not empty) */
addfield(L, &b, i);
luaL_pushresult(&b);
return 1;
}