From: Victor Stinner <vstinner@redhat.com>
Date: Tue, 25 Jun 2019 23:49:32 +0000 (+0200)
Subject: bpo-37388: Add PyUnicode_Decode(str, 0) fast-path (GH-14385)
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=ed076ed467264b43ed01a8223ca65b133b590919;p=python

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

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

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index b6f3d8f18c..51d314b61a 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -3354,6 +3354,10 @@ PyUnicode_Decode(const char *s,
         return NULL;
     }
 
+    if (size == 0) {
+        _Py_RETURN_UNICODE_EMPTY();
+    }
+
     if (encoding == NULL) {
         return PyUnicode_DecodeUTF8Stateful(s, size, errors, NULL);
     }