102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
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/*-
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* Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <geom/geom.h>
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#include <geom/label/g_label.h>
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#define G_LABEL_MSDOSFS_DIR "msdosfs"
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#define FAT12 "FAT12 "
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#define FAT16 "FAT16 "
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#define FAT32 "FAT32 "
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#define VOLUME_LEN 11
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#define NO_NAME "NO NAME "
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static void
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g_label_msdosfs_taste(struct g_consumer *cp, char *label, size_t size)
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{
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struct g_provider *pp;
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char *sector, *volume;
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int i, error;
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g_topology_assert_not();
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pp = cp->provider;
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label[0] = '\0';
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sector = (char *)g_read_data(cp, 0, pp->sectorsize, &error);
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if (sector == NULL || error != 0)
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return;
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if (strncmp(sector + 0x36, FAT12, strlen(FAT12)) == 0) {
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G_LABEL_DEBUG(1, "MSDOS (FAT12) file system detected on %s.",
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pp->name);
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volume = sector + 0x2b;
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} else if (strncmp(sector + 0x36, FAT16, strlen(FAT16)) == 0) {
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G_LABEL_DEBUG(1, "MSDOS (FAT16) file system detected on %s.",
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pp->name);
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volume = sector + 0x2b;
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} else if (strncmp(sector + 0x52, FAT32, strlen(FAT32)) == 0) {
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G_LABEL_DEBUG(1, "MSDOS (FAT32) file system detected on %s.",
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pp->name);
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volume = sector + 0x47;
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} else {
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g_free(sector);
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return;
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}
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if (strncmp(volume, NO_NAME, VOLUME_LEN) == 0) {
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g_free(sector);
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return;
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}
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if (volume[0] == '\0') {
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g_free(sector);
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return;
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}
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bzero(label, size);
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strlcpy(label, volume, MIN(size, VOLUME_LEN));
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g_free(sector);
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for (i = size - 1; i > 0; i--) {
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if (label[i] == '\0')
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continue;
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else if (label[i] == ' ')
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label[i] = '\0';
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else
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break;
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}
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}
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const struct g_label_desc g_label_msdosfs = {
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.ld_taste = g_label_msdosfs_taste,
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.ld_dir = G_LABEL_MSDOSFS_DIR
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};
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