Escape all special characters in printf()

Question

Is there an easy way to escape all special characters in the printf() function?

The reason why I would like to know how to do this is because I am print

Answer 1

Use the isprint library function to determine if the character is printable:

#include 
...
if (isprint(data[i]))
  printf(" %c", data[i]);    // prints character
else
  printf(" %d", data[i]);    // prints code value for character