Synopsis

The macro EOF shall only be compared with the unmodified return value from any Standard Library function capable of returning EOF

Enabled by default

Yes

Severity/Certainty

Medium/Medium

Full description

The macro EOF is compared with a value not originating from a function capable of returning EOF.

Coding standards

Code examples

The following code example fails the check and will give a warning:

#include <stdio.h>
#include <stdint.h>

void f(void)
{
  int a = getchar();
  a = 5;
  if (a == EOF) {
  }
}

The following code example passes the check and will not give a warning about this issue:

#include <stdio.h>
#include <stdint.h>

void f(void)
{
  int a = getchar();
  a = 5;
}