#include <stdio.h>

int ferror  (
    FILE* stream);    /* file stream to check */

The function ferror tests a data stream for read or write errors. The parameter stream is a pointer defining the data stream. If an error has occurred, the error indicator remains set until the file is closed or rewound.

The function is included in the library RL-FlashFS. The prototype is defined in the file stdio.h.

• 0 - no errors.
• non-zero value - errors occurred.

fclose, feof, rewind

#include <rtl.h>
#include <stdio.h>

void tst_ferror (void)  {
  FILE *fin;

  if (fin = fopen ("Test_ferror") != NULL)  {
    // Read all characters from the file
    while (!feof (fin))  {
      printf ("%s\n", fgetc (fin));
    }
    if (ferror (fin))  {
      printf ("Errors occurred while reading the file!\n");
    }
    fclose (fin);
  }
}