From 621ef3d84f842a10dc9cb2af5ab9555b1663b79e Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Tue, 2 Oct 2012 00:33:47 +0200
Subject: Issue #15609: Optimize str%args for integer argument

 - Use _PyLong_FormatWriter() instead of formatlong() when possible, to avoid
   a temporary buffer
 - Enable the fast path when width is smaller or equals to the length,
   and when the precision is bigger or equals to the length
 - Add unit tests!
 - formatlong() uses PyUnicode_Resize() instead of _PyUnicode_FromASCII()
   to resize the output string
---
 Python/formatter_unicode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'Python')

diff --git a/Python/formatter_unicode.c b/Python/formatter_unicode.c
index aa62502dbe..0ce9862a20 100644
--- a/Python/formatter_unicode.c
+++ b/Python/formatter_unicode.c
@@ -757,7 +757,8 @@ format_string_internal(PyObject *value, const InternalFormatSpec *format,
         goto done;
     }
 
-    if (format->width == -1 && format->precision == -1) {
+    if ((format->width == -1 || format->width <= len)
+        && (format->precision == -1 || format->precision >= len)) {
         /* Fast path */
         return _PyUnicodeWriter_WriteStr(writer, value);
     }
-- 
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