From ca31c2b32211d4f8b93c86787a11fd39e99d8c0d Mon Sep 17 00:00:00 2001
From: Victor Zverovich <victor.zverovich@gmail.com>
Date: Fri, 20 Jun 2014 08:04:44 -0700
Subject: [PATCH] Fix handling of octal prefix.

---
 format.h            | 4 ++--
 test/printf-test.cc | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/format.h b/format.h
index 26e1ae3e..56bf470a 100644
--- a/format.h
+++ b/format.h
@@ -1313,8 +1313,8 @@ typename fmt::BasicWriter<Char>::CharPtr
   if (spec.precision() > static_cast<int>(num_digits)) {
     // Octal prefix '0' is counted as a digit, so ignore it if precision
     // is specified.
-    if (prefix_size == 1)
-      prefix_size = 0;
+    if (prefix_size > 0 && prefix[prefix_size - 1] == '0')
+      --prefix_size;
     unsigned number_size = prefix_size + spec.precision();
     if (number_size < width) {
       buffer_.reserve(width);
diff --git a/test/printf-test.cc b/test/printf-test.cc
index 4ae45964..e5f7f7a1 100644
--- a/test/printf-test.cc
+++ b/test/printf-test.cc
@@ -229,6 +229,7 @@ TEST(PrintfTest, DynamicWidth) {
 
 TEST(PrintfTest, Precision) {
   EXPECT_PRINTF("00042", "%.5d", 42);
+  EXPECT_PRINTF("-00042", "%.5d", -42);
   EXPECT_PRINTF("00042", "%.5x", 0x42);
   EXPECT_PRINTF("0x00042", "%#.5x", 0x42);
   EXPECT_PRINTF("00042", "%.5o", 042);