Add depth/index to decode depth error message

Include depth and character index when throwing decode nesting errors.

Pre-emptively add a test decoding a massively nested JSON array. Lua
stack overflow faults are unlikely to occur on simple data structures.
Valgrind can highlight stack allocation bugs with complicated JSON even
if the test succeeds.

1 files changed, 5 insertions, 2 deletions

diff --git a/tests/test.lua b/tests/test.lua
index 4c00453..8bb5b95 100755
--- a/tests/test.lua
+++ b/tests/test.lua
@@ -162,15 +162,18 @@ local cjson_tests = {
       true, { {{{{{ "nested" }}}}} } },
     { "Decode array over nested limit [throw error]",
       json.decode, { '[[[[[[ "nested" ]]]]]]' },
-      false, { "Too many nested data structures" } },
+      false, { "Found too many nested data structures (6) at character 6" } },
     { "Decode object at nested limit",
       json.decode, { '{"a":{"b":{"c":{"d":{"e":"nested"}}}}}' },
       true, { {a={b={c={d={e="nested"}}}}} } },
     { "Decode object over nested limit [throw error]",
       json.decode, { '{"a":{"b":{"c":{"d":{"e":{"f":"nested"}}}}}}' },
-      false, { "Too many nested data structures" } },
+      false, { "Found too many nested data structures (6) at character 26" } },
     { "Set decode_max_depth(1000)",
       json.decode_max_depth, { 1000 }, true, { 1000 } },
+    { "Decode deeply nested array [throw error]",
+      json.decode, { string.rep("[", 1100) .. '1100' .. string.rep("]", 1100)},
+      false, { "Found too many nested data structures (1001) at character 1001" } },
 
     -- Test encoding nested tables
     { "Set encode_max_depth(5)",