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BSD 4.3reno

/*
	readdir -- read next entry from a directory stream

	last edit:	25-Apr-1987	D A Gwyn
*/

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

#ifndef	GETDENTS
extern int	getdents();		/* SVR3 system call, or emulation */

extern int	errno;

#ifndef NULL
#define	NULL	0
#endif

struct dirent *
readdir( dirp )
	register DIR		*dirp;	/* stream from opendir() */
	{
	register struct dirent	*dp;	/* -> directory data */

	if ( dirp == NULL || dirp->dd_buf == NULL )
		{
		errno = EFAULT;
		return NULL;		/* invalid pointer */
		}

	do	{
		if ( dirp->dd_loc >= dirp->dd_size )	/* empty or obsolete */
			dirp->dd_loc = dirp->dd_size = 0;

		if ( dirp->dd_size == 0	/* need to refill buffer */
		  && (dirp->dd_size =
			getdents( dirp->dd_fd, dirp->dd_buf, (unsigned)DIRBUF )
		     ) <= 0
		   )
			return NULL;	/* EOF or error */

		dp = (struct dirent *)&dirp->dd_buf[dirp->dd_loc];
		dirp->dd_loc += dp->d_reclen;
		}
	while ( dp->d_ino == 0L );	/* don't rely on getdents() */

	return dp;
	}
#endif

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