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freifunkist-firmware/package/utils/lua/patches-host/012-lnum-fix-ltle-relationa...

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lua: Fixed broken __lt/__le operators caused by lnum patch. This was found while investigating why luarocks does not work. It was traced to a quite old lnum patch for 5.1.3. I compared against the latest 5.1.4 patch - https://github.com/LuaDist/lualnum and discovered the lessthan/lessequal evaluation was not falling through to the call_orderTM (tag methods). I have tested LuCI (simple tests) and used the following lua code to validate the patch (both host and target patches supplied): - > local my_mt = { > __eq = function(v1, v2) > print("__eq") > return false > end, > __lt = function(v1, v2) > print("__lt") > return false > end, > __le = function(v1, v2) > print("__le") > return false > end > } > > function get_my(vstring) > local my = {} > my.string = vstring; > setmetatable(my, my_mt); > return my; > end > > local a = get_my("1.0") > local b = get_my("1.0") > > local eq_works = a == b; > local lt_works = a < b; > local gt_works = a > b; > > local lte_works = a <= b; > local gte_works = a >= b; Without the patch the following error will be presented: - “attempt to compare two table values” Signed-off-by: David Thornley <david.thornley@touchstargroup.com>
9 years ago
--- a/src/lvm.c
+++ b/src/lvm.c
@@ -284,7 +284,8 @@ int luaV_lessthan (lua_State *L, const T
else
return luai_numlt( nvalue_fast(l), cast_num(ivalue(r)) );
- } else if ((res = call_orderTM(L, l, r, TM_LT)) != -1)
+ }
+ if ((res = call_orderTM(L, l, r, TM_LT)) != -1)
return res;
return luaG_ordererror(L, l, r);
@@ -322,7 +323,8 @@ static int lessequal (lua_State *L, cons
else
return luai_numle( nvalue_fast(l), cast_num(ivalue(r)) );
- } else if ((res = call_orderTM(L, l, r, TM_LE)) != -1) /* first try `le' */
+ }
+ if ((res = call_orderTM(L, l, r, TM_LE)) != -1) /* first try `le' */
return res;
else if ((res = call_orderTM(L, r, l, TM_LT)) != -1) /* else try `lt' */
return !res;