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/*
Copyright (C) 2017 Free Software Foundation, Inc.
This file is part of the GNU Hurd.
The GNU Hurd 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 2, or (at
your option) any later version.
The GNU Hurd 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 the GNU Hurd. If not, see <<a rel="nofollow" href="http://www.gnu.org/licenses/">http://www.gnu.org/licenses/</a>>.
*/
/*
* Per-function files implementation.
*
* Implementation of all files repeated for each function.
*/
#include <func_files.h>
#include <assert.h>
/* Read an acpi table */
error_t
io_acpi_table (struct acpi_table *t, off_t offset, size_t *len, void *data)
{
error_t err;
size_t datalen;
/* This should never happen */
assert_backtrace (t != 0);
datalen = t->datalen;
/* Don't exceed the size of the acpi table */
if (offset > datalen)
return EINVAL;
if ((offset + *len) > datalen)
*len = datalen - offset;
memcpy (data, t->data + offset, *len);
return err;
}
/* Read from an acpi table file */
error_t
io_acpi_file (struct acpifs_dirent *e, off_t offset, size_t *len,
void *data)
{
size_t datalen;
struct acpi_table *table;
/* This should never happen */
assert_backtrace (e->acpitable != 0);
/* Get the table */
table = e->acpitable;
datalen = table->datalen;
/* Don't exceed the region size */
if (offset > datalen)
return EINVAL;
if ((offset + *len) > datalen)
*len = datalen - offset;
memcpy (data, table->data + offset, *len);
return 0;
}
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