__eof - Determine End of File

Syntax

#include <io.h>
int __eof (int handle);

eof determines whether the file pointer has reached the end-of-file for the file associated with handle. You cannot use __eof on a nonseekable file; it will fail.

eof returns the value 1 if the current position is the end of the file or 0 if it is not. A return value of -1 shows an error, and the system sets errno to the following values:
Value
EBADF
EOS2ERR

This example creates the file sample.dat and then checks if the file pointer is at the end of that file using the __eof function.

#include <sys\stat.h>#include <io.h>
#include <stdio.h>
#include <stdlib.h>;

int main(void)
{
   int fh,returnValue;

   fh = creat("sample.dat", S_IREAD|S_IWRITE);
   if (-1 == fh) {
      perror("Error creating sample.dat");
      return EXIT_FAILURE;
   }
   if (-1 == (returnValue = __eof(fh))) {
      perror("eof function error");
      return EXIT_FAILURE;
   }
   if (1 == returnValue)
      printf("File pointer is at end-of-file position.\n");
   else
      printf("File pointer is not at end-of-file position.\n");
   close(fh);
   return 0;

   /****************************************************************************
      The output should be:

      File pointer is at end-of-file position.
   ****************************************************************************/
}

[Back: _endthread - Terminate Current Thread]

[Next: erf - erfc - Calculate Error Functions]