upe(6.1): Standard I/O: vis

/* upe(6.1): Standard I/O: vis
   created on Mar 28, 2011
   */

/* vis: make funny characters visible (version 1) */

#include    "stdio.h"
#include    "ctype.h"

int main()
{
    int c;

    while ((c = getchar()) != EOF)
      if (isascii(c) &&
                  (isprint(c) || c=='\n' || c=='\t' || c==' '))
        putchar(c);
      else
        printf("\\%03o", c);
    exit(0);
}