From 21a282a2a427cb33d12d1d31ae8aee14d9bbb8c3 Mon Sep 17 00:00:00 2001
From: Marco Paland <marco@paland.com>
Date: Fri, 14 Sep 2018 15:02:57 +0200
Subject: fix(printf): ignore 0 flag for integers if precision is specified

Fixes #27
---
 printf.c            | 5 +++++
 test/test_suite.cpp | 6 ++++++
 2 files changed, 11 insertions(+)

diff --git a/printf.c b/printf.c
index 9ef669f..a7a3d68 100644
--- a/printf.c
+++ b/printf.c
@@ -551,6 +551,11 @@ static int _vsnprintf(out_fct_type out, char* buffer, const size_t maxlen, const
           flags &= ~(FLAGS_PLUS | FLAGS_SPACE);
         }
 
+        // ignore '0' flag when precision is given
+        if (flags & FLAGS_PRECISION) {
+          flags &= ~FLAGS_ZEROPAD;
+        }
+
         // convert the integer
         if ((*format == 'i') || (*format == 'd')) {
           // signed
diff --git a/test/test_suite.cpp b/test/test_suite.cpp
index 99e07b7..45f1abe 100644
--- a/test/test_suite.cpp
+++ b/test/test_suite.cpp
@@ -934,6 +934,12 @@ TEST_CASE("length", "[]" ) {
 
   test::sprintf(buffer, "%20.X", 0U);
   REQUIRE(!strcmp(buffer, "                    "));
+
+  test::sprintf(buffer, "%02.0u", 0U);
+  REQUIRE(!strcmp(buffer, "  "));
+
+  test::sprintf(buffer, "%02.0d", 0);
+  REQUIRE(!strcmp(buffer, "  "));
 }
 
 
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