/* 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; } }