/*      $OpenBSD: nftw.c,v 1.8 2019/01/25 00:19:25 millert Exp $        */

/*
 * Copyright (c) 2003, 2004 Todd C. Miller <millert@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Sponsored in part by the Defense Advanced Research Projects
 * Agency (DARPA) and Air Force Research Laboratory, Air Force
 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fts.h>
#include <ftw.h>

int
nftw(const char *path, int (*fn)(const char *, const struct stat *, int,
     struct FTW *), int nfds, int ftwflags)
{
        char * const paths[2] = { (char *)path, NULL };
        struct FTW ftw;
        FTSENT *cur;
        FTS *ftsp;
        int error = 0, ftsflags, fnflag, postorder, sverrno;

        /* XXX - nfds is currently unused */
        if (nfds < 1) {
                errno = EINVAL;
                return (-1);
        }

        ftsflags = FTS_COMFOLLOW;
        if (!(ftwflags & FTW_CHDIR))
                ftsflags |= FTS_NOCHDIR;
        if (ftwflags & FTW_MOUNT)
                ftsflags |= FTS_XDEV;
        if (ftwflags & FTW_PHYS)
                ftsflags |= FTS_PHYSICAL;
        else
                ftsflags |= FTS_LOGICAL;
        postorder = (ftwflags & FTW_DEPTH) != 0;
        ftsp = fts_open(paths, ftsflags, NULL);
        if (ftsp == NULL)
                return (-1);
        while ((cur = fts_read(ftsp)) != NULL) {
                switch (cur->fts_info) {
                case FTS_D:
                        if (postorder)
                                continue;
                        fnflag = FTW_D;
                        break;
                case FTS_DNR:
                        fnflag = FTW_DNR;
                        break;
                case FTS_DP:
                        if (!postorder)
                                continue;
                        fnflag = FTW_DP;
                        break;
                case FTS_F:
                case FTS_DEFAULT:
                        fnflag = FTW_F;
                        break;
                case FTS_NS:
                case FTS_NSOK:
                        fnflag = FTW_NS;
                        break;
                case FTS_SL:
                        fnflag = FTW_SL;
                        break;
                case FTS_SLNONE:
                        fnflag = FTW_SLN;
                        break;
                case FTS_DC:
                        errno = ELOOP;
                        /* FALLTHROUGH */
                default:
                        error = -1;
                        goto done;
                }
                ftw.base = cur->fts_pathlen - cur->fts_namelen;
                ftw.level = cur->fts_level;
                error = fn(cur->fts_path, cur->fts_statp, fnflag, &ftw);
                if (error != 0)
                        break;
        }
done:
        sverrno = errno;
        if (fts_close(ftsp) != 0 && error == 0)
                error = -1;
        else
                errno = sverrno;
        return (error);
}