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/*

 *  A test support function which extends the file to the specified

 *  length.  This handles the implied open(), lseek(), write(), and close()

 *  operations.

 *

 *  The defined behavior is a seek() followed by a write() extends the file

 *  and zero fills the new length part.

 *

 *  test_extend.c,v 1.2 2002/08/02 00:53:21 joel Exp

 */

#include <stdio.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <errno.h>

#include <string.h>

#include <ctype.h>

#include <assert.h>

#include <pmacros.h>

/*

 *  test_extend routine

 */

void test_extend(

  char   *file,

  off_t  offset

)

{

  int   fd;

  int   status;

  char  c = 0;

  fd = open( file, O_WRONLY );

  if ( fd == -1 ) {

    printf( "test_extend: open( %s ) failed : %s\n", file, strerror( errno ) );

    rtems_test_exit( 0 );

  }

  status = lseek( fd, offset - 1, SEEK_SET );

  assert( status != -1 );

  status = write( fd, &c, 1 );

  if ( status == -1 ) {

    printf( "test_extend: write( %s ) failed : %s\n", file, strerror( errno ) );

    rtems_test_exit( 0 );

  }

  if ( status != 1 ) {

    printf( "test_extend: write( %s ) only wrote %d of %d bytes\n",

            file, status, 1 );

    rtems_test_exit( 0 );

  }

  status = close( fd );

  assert( !status );

}