fix(printf): ignore 0 flag for integers if precision is specified

Fixes #27

2 files changed, 11 insertions, 0 deletions

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, "  "));

 }