lib/libfsid/libfsid.c

   1 /*
   2  * Copyright (c) 2010 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Ákos Kovács <akoskovacs@gmx.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/stat.h>
  36
  37 #include <errno.h>
  38
  39 #include "libfsid.h"
  40
  41 static struct fs_type fs_types[] = {
  42     { "HAMMER", hammer_probe,   hammer_volname  },
  43     { "UFS",    ufs_probe,      ufs_volname     },
  44     { "CD9660", cd9660_probe,   cd9660_volname  },
  45     { "EXT2",   ext2_probe,     ext2_volname    },
  46     { "MSDOSFS",msdosfs_probe,  msdosfs_volname },
  47     { NULL,     NULL,           NULL            }
  48 };
  49
  50 const char *
  51 fsid_fsname(fsid_t id)
  52 {
  53         if (id < 1)
  54                 return 0;
  55
  56         return fs_types[id-1].fs_name;
  57 }
  58
  59 int
  60 fsid_fs_count(void)
  61 {
  62         int count;
  63
  64         for (count = 0; fs_types[count].fs_name != NULL; count++)
  65                 ;       /* nothing */
  66
  67         return count;
  68 }
  69
  70 fsid_t
  71 fsid_probe(const char *dev, const char *fs_type)
  72 {
  73         int i;
  74
  75         if (dev == NULL || fs_type == NULL)
  76                 return FSID_UNKNOWN;
  77
  78         for (i = 0; fs_types[i].fs_name != NULL; i++)  {
  79                 if ((strcmp(fs_type, fs_types[i].fs_name)) == 0)
  80                         return fs_types[i].fs_probe(dev);
  81         }
  82         return FSID_UNKNOWN;
  83 }
  84
  85 fsid_t
  86 fsid_probe_all(const char *dev)
  87 {
  88         int i;
  89         fsid_t ret;
  90
  91         if (dev == NULL)
  92                 return FSID_UNKNOWN;
  93
  94         for (i = 0; fs_types[i].fs_name != NULL; i++) {
  95                 if ((ret = fs_types[i].fs_probe(dev)) != FSID_UNKNOWN)
  96                         return ret;
  97         }
  98         return FSID_UNKNOWN;
  99 }
 100
 101 char *
 102 fsid_volname(const char *dev, const char *fs_type)
 103 {
 104         int i;
 105
 106         if (dev == NULL || fs_type == NULL)
 107                 return NULL;
 108
 109         for (i = 0; fs_types[i].fs_name != NULL; i++) {
 110                 if ((strcmp(fs_type, fs_types[i].fs_name)) == 0) {
 111                         return fs_types[i].fs_volname(dev);
 112                 }
 113         }
 114         return NULL;
 115 }
 116
 117 char *
 118 fsid_volname_all(const char *dev)
 119 {
 120         int fs_id;
 121
 122         if (dev == NULL)
 123                 return NULL;
 124
 125         if ((fs_id = fsid_probe_all(dev)) != 0)
 126                 return fs_types[fs_id - 1].fs_volname(dev);
 127         else
 128                 return NULL;
 129 }
 130
 131 int
 132 fsid_dev_read(const char *dev, off_t off, size_t len, char *buf)
 133 {
 134         int fd;
 135
 136         if ((fd = open(dev, O_RDONLY)) < 0)
 137                 return -1;
 138
 139         if ((lseek(fd, off, SEEK_SET)) < 0) {
 140                 close(fd);
 141                 return -1;
 142         }
 143
 144         bzero(buf, len);
 145         if ((read(fd, buf, len)) < 0) {
 146                 close(fd);
 147                 return -1;
 148         }
 149
 150         close(fd);
 151
 152         return 0;
 153 }