commit ed076ed467264b43ed01a8223ca65b133b590919
author Victor Stinner <vstinner@redhat.com> Wed Jun 26 01:49:32 2019 +0200
committer GitHub <noreply@github.com> Wed Jun 26 01:49:32 2019 +0200
tree 480845a2680f6e36fd0f70bbf4e51e8f8d81134c
parent 22eb689cf3de7972a2789db3ad01a86949508ab7

bpo-37388: Add PyUnicode_Decode(str, 0) fast-path (GH-14385)

Add a fast-path to PyUnicode_Decode() for size equals to 0.

Objects/unicodeobject.c

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index b6f3d8f..51d314b 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -3354,6 +3354,10 @@
         return NULL;
     }
 
+    if (size == 0) {
+        _Py_RETURN_UNICODE_EMPTY();
+    }
+
     if (encoding == NULL) {
         return PyUnicode_DecodeUTF8Stateful(s, size, errors, NULL);
     }