Ultrix-3.1/src/libc/dir/seekdir.c

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/**********************************************************************
 *   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    *
 *   All Rights Reserved. 					      *
 *   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      *
 **********************************************************************/

/*
 * static char sccsid[] = "@(#)seekdir.c	3.0	4/22/86";
 */

#include <sys/param.h>
#include <ndir.h>
#include "odir.h"

/*
 * seek to an entry in a directory.
 * Only values returned by "telldir" should be passed to seekdir.
 */
void
seekdir(dirp, loc)
	register DIR *dirp;
	long loc;
{
	long base, offset;
	struct direct *dp;

/* rti!trt: Always seek.  Slower, but safer. This may even fix a bug.
	if (loc == telldir(dirp))
		return;
 */
	base = (loc / RDSZ) * RDSZ;
	offset = (loc % RDSZ)/sizeof(struct olddirect)*OENTSIZ;
	lseek(dirp->dd_fd, base, 0);
	dirp->dd_loc = 0;
	while (dirp->dd_loc < offset) {
		dp = readdir(dirp);
		if (dp == NULL)
			return;
	}
}