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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2004,2007 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/partition.h>
#include <grub/disk.h>
#include <grub/i18n.h>
#ifdef GRUB_UTIL
#include <grub/util/misc.h>
#endif
grub_partition_map_t grub_partition_map_list;
/*
* Checks that disk->partition contains part. This function assumes that the
* start of part is relative to the start of disk->partition. Returns 1 if
* disk->partition is null.
*/
static int
grub_partition_check_containment (const grub_disk_t disk,
const grub_partition_t part)
{
if (disk->partition == NULL)
return 1;
if (part->start + part->len > disk->partition->len)
{
char *partname;
partname = grub_partition_get_name (disk->partition);
grub_dprintf ("partition", "sub-partition %s%d of (%s,%s) ends after parent.\n",
part->partmap->name, part->number + 1, disk->name, partname);
#ifdef GRUB_UTIL
grub_util_warn (_("Discarding improperly nested partition (%s,%s,%s%d)"),
disk->name, partname, part->partmap->name, part->number + 1);
#endif
grub_free (partname);
return 0;
}
return 1;
}
/* Context for grub_partition_map_probe. */
struct grub_partition_map_probe_ctx
{
int partnum;
grub_partition_t p;
};
/* Helper for grub_partition_map_probe. */
static int
probe_iter (grub_disk_t dsk, const grub_partition_t partition, void *data)
{
struct grub_partition_map_probe_ctx *ctx = data;
if (ctx->partnum != partition->number)
return 0;
if (!(grub_partition_check_containment (dsk, partition)))
return 0;
ctx->p = (grub_partition_t) grub_malloc (sizeof (*ctx->p));
if (! ctx->p)
return 1;
grub_memcpy (ctx->p, partition, sizeof (*ctx->p));
return 1;
}
static grub_partition_t
grub_partition_map_probe (const grub_partition_map_t partmap,
grub_disk_t disk, int partnum)
{
struct grub_partition_map_probe_ctx ctx = {
.partnum = partnum,
.p = 0
};
partmap->iterate (disk, probe_iter, &ctx);
if (grub_errno)
goto fail;
return ctx.p;
fail:
grub_free (ctx.p);
return 0;
}
grub_partition_t
grub_partition_probe (struct grub_disk *disk, const char *str)
{
grub_partition_t part = 0;
grub_partition_t curpart = 0;
grub_partition_t tail;
const char *ptr;
part = tail = disk->partition;
for (ptr = str; *ptr;)
{
grub_partition_map_t partmap;
int num;
const char *partname, *partname_end;
partname = ptr;
while (*ptr && grub_isalpha (*ptr))
ptr++;
partname_end = ptr;
num = grub_strtoul (ptr, (char **) &ptr, 0) - 1;
curpart = 0;
/* Use the first partition map type found. */
FOR_PARTITION_MAPS(partmap)
{
if (partname_end != partname &&
(grub_strncmp (partmap->name, partname, partname_end - partname)
!= 0 || partmap->name[partname_end - partname] != 0))
continue;
disk->partition = part;
curpart = grub_partition_map_probe (partmap, disk, num);
disk->partition = tail;
if (curpart)
break;
if (grub_errno == GRUB_ERR_BAD_PART_TABLE)
{
/* Continue to next partition map type. */
grub_errno = GRUB_ERR_NONE;
continue;
}
break;
}
if (! curpart)
{
while (part)
{
curpart = part->parent;
grub_free (part);
part = curpart;
}
return 0;
}
curpart->parent = part;
part = curpart;
if (! ptr || *ptr != ',')
break;
ptr++;
}
return part;
}
/* Context for grub_partition_iterate. */
struct grub_partition_iterate_ctx
{
int ret;
grub_partition_iterate_hook_t hook;
void *hook_data;
};
/* Helper for grub_partition_iterate. */
static int
part_iterate (grub_disk_t dsk, const grub_partition_t partition, void *data)
{
struct grub_partition_iterate_ctx *ctx = data;
struct grub_partition p = *partition;
if (!(grub_partition_check_containment (dsk, partition)))
return 0;
p.parent = dsk->partition;
dsk->partition = 0;
if (ctx->hook (dsk, &p, ctx->hook_data))
{
ctx->ret = 1;
return 1;
}
if (p.start != 0)
{
const struct grub_partition_map *partmap;
dsk->partition = &p;
FOR_PARTITION_MAPS(partmap)
{
grub_err_t err;
err = partmap->iterate (dsk, part_iterate, ctx);
if (err)
grub_errno = GRUB_ERR_NONE;
if (ctx->ret)
break;
}
}
dsk->partition = p.parent;
return ctx->ret;
}
int
grub_partition_iterate (struct grub_disk *disk,
grub_partition_iterate_hook_t hook, void *hook_data)
{
struct grub_partition_iterate_ctx ctx = {
.ret = 0,
.hook = hook,
.hook_data = hook_data
};
const struct grub_partition_map *partmap;
FOR_PARTITION_MAPS(partmap)
{
grub_err_t err;
err = partmap->iterate (disk, part_iterate, &ctx);
if (err)
grub_errno = GRUB_ERR_NONE;
if (ctx.ret)
break;
}
return ctx.ret;
}
char *
grub_partition_get_name (const grub_partition_t partition)
{
char *out = 0, *ptr;
grub_size_t needlen = 0;
grub_partition_t part;
if (!partition)
return grub_strdup ("");
for (part = partition; part; part = part->parent)
/* Even on 64-bit machines this buffer is enough to hold
longest number. */
needlen += grub_strlen (part->partmap->name) + 1 + 27;
out = grub_malloc (needlen + 1);
if (!out)
return NULL;
ptr = out + needlen;
*ptr = 0;
for (part = partition; part; part = part->parent)
{
char buf[27];
grub_size_t len;
grub_snprintf (buf, sizeof (buf), "%d", part->number + 1);
len = grub_strlen (buf);
ptr -= len;
grub_memcpy (ptr, buf, len);
len = grub_strlen (part->partmap->name);
ptr -= len;
grub_memcpy (ptr, part->partmap->name, len);
*--ptr = ',';
}
grub_memmove (out, ptr + 1, out + needlen - ptr);
return out;
}
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