filelength

Gets file size in bytes.

Defined in header <io.h>

Syntax

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

Portability

Remarks

filelength returns the length (in bytes) of the file associated with handle.

Retum value

On success, filelength returns a long value, the file length in bytes. On error, it returns -1 and the global variable errno is set to

EBADF Bad file number

See also

• fopen
• lseek
• open

Example

#include <stdio.h>
#include <io.h>
#include <fcntl.h>
#include <sys\stat.h>
#include <string.h>

int main (void)
{
   int handle;
   char buf[ll] =  "0123456789";
   /* create a file containing  10 bytes */
   handle = open("DUfflY.FIL", 0_RDWRI0_CREATI0_TRUNC, S_IREAD|S_IWRITE)
   write(handle, buf, strlen(buf ));
   /* display the size of the  file */
   printf("file length in bytes:  %ld\n", filelength(handle));

   /* close the file  */
   close(handle) ;
   return 0;

Differences from modern implementations

Nothing recorded yet.

Modern references

• Microsoft C runtime (search)

These are search links, not yet checked by hand.

Stable link: /3.1/io.h/filelength/ · short form /3.1/filelength/