From e262c978f4cb8b448087102b68bbdcc731a090a0 Mon Sep 17 00:00:00 2001
From: Szczepan Zalega <szczepan@nitrokey.com>
Date: Fri, 28 Oct 2016 11:47:06 +0200
Subject: Print ascii representation of dump in hexdump

Signed-off-by: Szczepan Zalega <szczepan@nitrokey.com>
---
 misc.cc | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/misc.cc b/misc.cc
index 9b339cd..c9d38cb 100644
--- a/misc.cc
+++ b/misc.cc
@@ -34,6 +34,7 @@ std::vector<uint8_t> hex_string_to_byte(const char* hexString){
     return data;
 };
 
+#include <cctype>
 std::string hexdump(const char *p, size_t size, bool print_header) {
   std::stringstream out;
   char formatbuf[128];
@@ -45,9 +46,23 @@ std::string hexdump(const char *p, size_t size, bool print_header) {
           out << formatbuf;
       }
 
-    for (const char *le = p + 16; p < le && p < pend; p++) {
-      snprintf(formatbuf, 128, "%02x ", uint8_t(*p));
-      out << formatbuf;
+    const char* pp = p;
+    for (const char *le = p + 16; p < le; p++) {
+      if (p < pend){
+        snprintf(formatbuf, 128, "%02x ", uint8_t(*p));
+        out << formatbuf;
+      } else {
+        out << "-- ";
+      }
+
+    }
+    out << "\t";
+
+    for (const char *le = pp + 16; pp < le && pp < pend; pp++) {
+      if (std::isgraph(*pp))
+        out << uint8_t(*pp);
+      else
+        out << '.';
     }
     out << std::endl;
   }
-- 
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