aboutsummaryrefslogtreecommitdiff
path: root/usr.sbin/makefs/msdos/msdosfs_lookup.c
diff options
context:
space:
mode:
Diffstat (limited to 'usr.sbin/makefs/msdos/msdosfs_lookup.c')
-rw-r--r--usr.sbin/makefs/msdos/msdosfs_lookup.c298
1 files changed, 298 insertions, 0 deletions
diff --git a/usr.sbin/makefs/msdos/msdosfs_lookup.c b/usr.sbin/makefs/msdos/msdosfs_lookup.c
new file mode 100644
index 000000000000..80bab768959d
--- /dev/null
+++ b/usr.sbin/makefs/msdos/msdosfs_lookup.c
@@ -0,0 +1,298 @@
+/* $NetBSD: msdosfs_lookup.c,v 1.37 1997/11/17 15:36:54 ws Exp $ */
+
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
+ * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
+ * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
+ * All rights reserved.
+ * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by TooLs GmbH.
+ * 4. The name of TooLs GmbH may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+/*-
+ * Written by Paul Popelka (paulp@uts.amdahl.com)
+ *
+ * You can do anything you want with this software, just don't say you wrote
+ * it, and don't remove this notice.
+ *
+ * This software is provided "as is".
+ *
+ * The author supplies this software to be publicly redistributed on the
+ * understanding that the author is not responsible for the correct
+ * functioning of this software in any circumstances and is not liable for
+ * any damages caused by this software.
+ *
+ * October 1992
+ */
+
+#include <sys/param.h>
+#include <sys/errno.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <fs/msdosfs/bpb.h>
+#include "msdos/denode.h"
+#include <fs/msdosfs/fat.h>
+#include <fs/msdosfs/msdosfsmount.h>
+
+#include "makefs.h"
+#include "msdos.h"
+
+/*
+ * dep - directory entry to copy into the directory
+ * ddep - directory to add to
+ * depp - return the address of the denode for the created directory entry
+ * if depp != 0
+ * cnp - componentname needed for Win95 long filenames
+ */
+int
+createde(struct denode *dep, struct denode *ddep, struct denode **depp,
+ struct componentname *cnp)
+{
+ int error;
+ u_long dirclust, diroffset;
+ struct direntry *ndep;
+ struct msdosfsmount *pmp = ddep->de_pmp;
+ struct m_buf *bp;
+ daddr_t bn;
+ int blsize;
+
+ MSDOSFS_DPRINTF(("createde(dep %p, ddep %p, depp %p, cnp %p)\n",
+ dep, ddep, depp, cnp));
+
+ /*
+ * If no space left in the directory then allocate another cluster
+ * and chain it onto the end of the file. There is one exception
+ * to this. That is, if the root directory has no more space it
+ * can NOT be expanded. extendfile() checks for and fails attempts
+ * to extend the root directory. We just return an error in that
+ * case.
+ */
+ if (ddep->de_fndoffset >= ddep->de_FileSize) {
+ diroffset = ddep->de_fndoffset + sizeof(struct direntry)
+ - ddep->de_FileSize;
+ dirclust = de_clcount(pmp, diroffset);
+ error = m_extendfile(ddep, dirclust, 0, 0, DE_CLEAR);
+ if (error) {
+ (void)detrunc(ddep, ddep->de_FileSize, 0, NULL);
+ return error;
+ }
+
+ /*
+ * Update the size of the directory
+ */
+ ddep->de_FileSize += de_cn2off(pmp, dirclust);
+ }
+
+ /*
+ * We just read in the cluster with space. Copy the new directory
+ * entry in. Then write it to disk. NOTE: DOS directories
+ * do not get smaller as clusters are emptied.
+ */
+ error = pcbmap(ddep, de_cluster(pmp, ddep->de_fndoffset),
+ &bn, &dirclust, &blsize);
+ if (error)
+ return error;
+ diroffset = ddep->de_fndoffset;
+ if (dirclust != MSDOSFSROOT)
+ diroffset &= pmp->pm_crbomask;
+ if ((error = bread((void *)pmp->pm_devvp, bn, blsize, NOCRED,
+ &bp)) != 0) {
+ return error;
+ }
+ ndep = bptoep(pmp, bp, ddep->de_fndoffset);
+
+ DE_EXTERNALIZE(ndep, dep);
+
+ /*
+ * Now write the Win95 long name
+ */
+ if (ddep->de_fndcnt > 0) {
+ uint8_t chksum = winChksum(ndep->deName);
+ const u_char *un = (const u_char *)cnp->cn_nameptr;
+ int unlen = cnp->cn_namelen;
+ int cnt = 1;
+
+ while (--ddep->de_fndcnt >= 0) {
+ if (!(ddep->de_fndoffset & pmp->pm_crbomask)) {
+ if ((error = bwrite(bp)) != 0)
+ return error;
+
+ ddep->de_fndoffset -= sizeof(struct direntry);
+ error = pcbmap(ddep,
+ de_cluster(pmp,
+ ddep->de_fndoffset),
+ &bn, 0, &blsize);
+ if (error)
+ return error;
+
+ error = bread((void *)pmp->pm_devvp, bn, blsize,
+ NOCRED, &bp);
+ if (error) {
+ return error;
+ }
+ ndep = bptoep(pmp, bp, ddep->de_fndoffset);
+ } else {
+ ndep--;
+ ddep->de_fndoffset -= sizeof(struct direntry);
+ }
+ if (!unix2winfn(un, unlen, (struct winentry *)ndep,
+ cnt++, chksum))
+ break;
+ }
+ }
+
+ if ((error = bwrite(bp)) != 0)
+ return error;
+
+ /*
+ * If they want us to return with the denode gotten.
+ */
+ if (depp) {
+ if (dep->de_Attributes & ATTR_DIRECTORY) {
+ dirclust = dep->de_StartCluster;
+ if (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)
+ dirclust = MSDOSFSROOT;
+ if (dirclust == MSDOSFSROOT)
+ diroffset = MSDOSFSROOT_OFS;
+ else
+ diroffset = 0;
+ }
+ return deget(pmp, dirclust, diroffset, 0, depp);
+ }
+
+ return 0;
+}
+
+/*
+ * Read in the disk block containing the directory entry (dirclu, dirofs)
+ * and return the address of the buf header, and the address of the
+ * directory entry within the block.
+ */
+int
+m_readep(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset,
+ struct m_buf **bpp, struct direntry **epp)
+{
+ int error;
+ daddr_t bn;
+ int blsize;
+
+ blsize = pmp->pm_bpcluster;
+ if (dirclust == MSDOSFSROOT
+ && de_blk(pmp, diroffset + blsize) > pmp->pm_rootdirsize)
+ blsize = de_bn2off(pmp, pmp->pm_rootdirsize) & pmp->pm_crbomask;
+ bn = detobn(pmp, dirclust, diroffset);
+ if ((error = bread((void *)pmp->pm_devvp, bn, blsize, NOCRED,
+ bpp)) != 0) {
+ *bpp = NULL;
+ return (error);
+ }
+ if (epp)
+ *epp = bptoep(pmp, *bpp, diroffset);
+ return (0);
+}
+
+/*
+ * Read in the disk block containing the directory entry dep came from and
+ * return the address of the buf header, and the address of the directory
+ * entry within the block.
+ */
+int
+m_readde(struct denode *dep, struct m_buf **bpp, struct direntry **epp)
+{
+
+ return (m_readep(dep->de_pmp, dep->de_dirclust, dep->de_diroffset,
+ bpp, epp));
+}
+
+/*
+ * Create a unique DOS name in dvp
+ */
+int
+uniqdosname(struct denode *dep, struct componentname *cnp, u_char *cp)
+{
+ struct msdosfsmount *pmp = dep->de_pmp;
+ struct direntry *dentp;
+ int gen;
+ int blsize;
+ u_long cn;
+ daddr_t bn;
+ struct m_buf *bp;
+ int error;
+
+ if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
+ return (unix2dosfn((const u_char *)cnp->cn_nameptr, cp,
+ cnp->cn_namelen, 0) ? 0 : EINVAL);
+
+ for (gen = 1;; gen++) {
+ /*
+ * Generate DOS name with generation number
+ */
+ if (!unix2dosfn((const u_char *)cnp->cn_nameptr, cp,
+ cnp->cn_namelen, gen))
+ return gen == 1 ? EINVAL : EEXIST;
+
+ /*
+ * Now look for a dir entry with this exact name
+ */
+ for (cn = error = 0; !error; cn++) {
+ if ((error = pcbmap(dep, cn, &bn, 0, &blsize)) != 0) {
+ if (error == E2BIG) /* EOF reached and not found */
+ return 0;
+ return error;
+ }
+ error = bread((void *)pmp->pm_devvp, bn, blsize,
+ NOCRED, &bp);
+ if (error) {
+ return error;
+ }
+ for (dentp = (struct direntry *)bp->b_data;
+ (char *)dentp < bp->b_data + blsize;
+ dentp++) {
+ if (dentp->deName[0] == SLOT_EMPTY) {
+ /*
+ * Last used entry and not found
+ */
+ brelse(bp);
+ return 0;
+ }
+ /*
+ * Ignore volume labels and Win95 entries
+ */
+ if (dentp->deAttributes & ATTR_VOLUME)
+ continue;
+ if (!bcmp(dentp->deName, cp, 11)) {
+ error = EEXIST;
+ break;
+ }
+ }
+ brelse(bp);
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 03:24:33 +0000