usr/src/contrib/isode/dirent/rewinddir.c

/*
        rewinddir -- rewind a directory stream

        last edit:      25-Apr-1987     D A Gwyn

        This is not simply a call to seekdir(), because seekdir()
        will use the current buffer whenever possible and we need
        rewinddir() to forget about buffered data.
*/

#include        <sys/errno.h>
#include        <sys/types.h>
#include        "usr.dirent.h"

#ifndef GETDENTS
extern off_t    lseek();

extern int      errno;

#ifndef NULL
#define NULL    0
#endif

#ifndef SEEK_SET
#define SEEK_SET        0
#endif

void
rewinddir( dirp )
        register DIR            *dirp;  /* stream from opendir() */
        {
        if ( dirp == NULL || dirp->dd_buf == NULL )
                {
                errno = EFAULT;
                return;                 /* invalid pointer */
                }

        dirp->dd_loc = dirp->dd_size = 0;       /* invalidate buffer */
        (void)lseek( dirp->dd_fd, (off_t)0, SEEK_SET ); /* may set errno */
        }
#else
int     _rewinddir_stub () {};
#endif