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researchv9-SUN3(old)

/* Copyright (c) 1982 Regents of the University of California */

static char sccsid[] = "@(#)seekdir.c 4.3 2/25/82";

#include <sys/types.h>
#include <ndir.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 curloc, base, offset;
	struct direct *dp;

	curloc = telldir(dirp);
	if (loc == curloc)
		return;
	base = loc & ~(DIRBLKSIZ - 1);
	offset = loc & (DIRBLKSIZ - 1);
	if (dirp->dd_loc != 0 && (curloc & ~(DIRBLKSIZ - 1)) == base) {
		dirp->dd_loc = offset;
		return;
	}
	lseek(dirp->dd_fd, base, 0);
	dirp->dd_loc = 0;
	while (dirp->dd_loc < offset) {
		dp = readdir(dirp);
		if (dp == NULL)
			return;
	}
}

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