rewind

Repositions the file pointer to the beginning of a file.

void rewind( FILE *stream );

For additional compatibility information, see Compatibility in the Introduction.

Libraries

Return Value

None

Parameter

stream

Pointer to FILE structure

Remarks

The rewind function repositions the file pointer associated with stream to the beginning of the file. A call to rewind is similar to

(void) fseek( stream, 0L, SEEK_SET );

However, unlike fseek, rewind clears the error indicators for the stream as well as the end-of-file indicator. Also, unlike fseek, rewind does not return a value to indicate whether the pointer was successfully moved.

To clear the keyboard buffer, use rewind with the stream stdin, which is associated with the keyboard by default.

Example

/* REWIND.C: This program first opens a file named
 * REWIND.OUT for input and output and writes two
 * integers to the file. Next, it uses rewind to
 * reposition the file pointer to the beginning of
 * the file and reads the data back in.
 */

#include <stdio.h>

void main( void )
{
   FILE *stream;
   int data1, data2;

   data1 = 1;
   data2 = -37;

   if( (stream = fopen( "rewind.out", "w+" )) != NULL )
   {
      fprintf( stream, "%d %d", data1, data2 );
      printf( "The values written are: %d and %d\n", data1, data2 );
      rewind( stream );
      fscanf( stream, "%d %d", &data1, &data2 );
      printf( "The values read are: %d and %d\n", data1, data2 );
      fclose( stream );
   }
}

Output

The values written are: 1 and -37
The values read are: 1 and -37

Stream I/O Routines