Add print helper functions

src/print_helper.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include "print_helper.h"
+
+int print_ascii_tbl (FILE *stream) {
+    for (char c = ' '; c <= '~'; c++) {
+        if(!fprintf(stream, "%c ", c)) {
+            return 0;
+        }
+    }
+    return fprintf(stream, "\n");
+}
+
+
+int print_for_human (FILE *stream, const unsigned char *array, const int len) {
+    for (int i = 0; i < len; i++) {
+        if (array[i] >= ' ' && array[i] <= '~') {
+            if(!fprintf(stream, "%c ", array[i])) {
+                return 0;
+            }
+        } else {
+            if(!fprintf(stream, "\"0x%02x\"", array[i])) {
+                return 0;
+            }
+        }
+    }
+    return 0;
+}

src/print_helper.h

@@ -0,0 +1,7 @@
+#ifndef _PRINT_HELPER_H_
+#define _PRINT_HELPER_H_
+
+int print_ascii_tbl (FILE *stream);
+int print_for_human (FILE *stream, const unsigned char *array, const int len);
+
+#endif /* _PRINT_HELPER_H_ */