From 7075d314a0875caa45c8571f7aa52f732f3612a9 Mon Sep 17 00:00:00 2001
From: Marco Paland <marco@paland.com>
Date: Fri, 14 Sep 2018 14:42:41 +0200
Subject: fix(printf): zero precision and zero value hash problem

Fixes #26
---
 printf.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

(limited to 'printf.c')

diff --git a/printf.c b/printf.c
index d71665f..9ef669f 100644
--- a/printf.c
+++ b/printf.c
@@ -163,9 +163,9 @@ static size_t _ntoa_format(out_fct_type out, char* buffer, size_t idx, size_t ma
 
   // handle hash
   if (flags & FLAGS_HASH) {
-    if (((len == prec) || (len == width)) && (len > 0U)) {
+    if (len && ((len == prec) || (len == width))) {
       len--;
-      if ((base == 16U) && (len > 0U)) {
+      if (len && (base == 16U)) {
         len--;
       }
     }
@@ -181,7 +181,7 @@ static size_t _ntoa_format(out_fct_type out, char* buffer, size_t idx, size_t ma
   }
 
   // handle sign
-  if ((len == width) && (negative || (flags & FLAGS_PLUS) || (flags & FLAGS_SPACE))) {
+  if (len && (len == width) && (negative || (flags & FLAGS_PLUS) || (flags & FLAGS_SPACE))) {
     len--;
   }
   if (len < PRINTF_NTOA_BUFFER_SIZE) {
@@ -225,6 +225,11 @@ static size_t _ntoa_long(out_fct_type out, char* buffer, size_t idx, size_t maxl
   char buf[PRINTF_NTOA_BUFFER_SIZE];
   size_t len = 0U;
 
+  // no hash for 0 values
+  if (!value) {
+    flags &= ~FLAGS_HASH;
+  }
+
   // write if precision != 0 and value is != 0
   if (!(flags & FLAGS_PRECISION) || value) {
     do {
@@ -245,6 +250,11 @@ static size_t _ntoa_long_long(out_fct_type out, char* buffer, size_t idx, size_t
   char buf[PRINTF_NTOA_BUFFER_SIZE];
   size_t len = 0U;
 
+  // no hash for 0 values
+  if (!value) {
+    flags &= ~FLAGS_HASH;
+  }
+
   // write if precision != 0 and value is != 0
   if (!(flags & FLAGS_PRECISION) || value) {
     do {
-- 
cgit v1.2.3