--- /dev/null
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+
+static inline void formatChar(char *str, char ch)
+{
+ // Print some common control codes.
+ switch (ch) {
+ case '\r': strcpy(str, "CR "); break;
+ case '\n': strcpy(str, "LF "); break;
+ case ' ': strcpy(str, "SP "); break;
+ case 27: strcpy(str, "^[ "); break;
+ case 3: strcpy(str, "^C "); break;
+ default:
+ if (isgraph(ch))
+ sprintf(str, "%c ", ch);
+ else
+ sprintf(str, "%02x ", ch);
+ break;
+ }
+}