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/* @file efi-reader.c
*
* Read EFI variables and populate debconf database for debian-installer
* Copyright (C) 2003, Alastair McKinstry <mckinstry@debian.org>
* Released under the GNU Public License; see file COPYING for details
*/
#include <linux/types.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <debian-installer.h>
#include <cdebconf/debconfclient.h>
#include "table.h"
/* snarfed from linux kernel efivars.c
*/
typedef u_int16_t efi_char16_t;
#if 0
typedef u_int8_t __u8;
typedef u_int32_t __u32;
#endif
typedef struct { __u8 b[16]; } efi_guid_t;
typedef unsigned long efi_status_t;
typedef struct _efi_variable_t {
efi_char16_t VariableName[1024/sizeof(efi_char16_t)];
efi_guid_t VendorGuid;
unsigned long DataSize;
__u8 Data[1024];
efi_status_t Status;
__u32 Attributes;
} __attribute__((packed)) efi_variable_t;
/**
* Get the three-letter lang code from /proc
* return 1 if error, 0 on success
*/
int get_efi_lang_code (char *lang_code)
{
int fd, err, sz;
efi_variable_t var_data;
/* Snarfed variable def. from linux/arch/ia64/kernel/efivars.c
* Probably should check out a more official interface, in case the format
* of /proc changes.
*/
fd = open ("/proc/efi/vars/Lang-8be4df61-93ca-11d2-aa0d-00e098032b8c", O_RDONLY);
if (fd < 0) {
err = errno;
di_error ("Failed to open /proc/efi/vars/Lang-*");
di_error (strerror (err));
return 1;
}
sz = read (fd, &var_data, sizeof (efi_variable_t));
close (fd);
if (sz == sizeof (efi_variable_t)) { // success
strncpy (lang_code, (const char *) var_data.Data, 3);
return 0;
}
return 1;
}
/**
* locales prefer the language to be a two-letter code;
* translate three-letter -> two-letter if possible (eg eng -> en)
*/
char *two_code (char *three_code)
{
int t = 0;
while (trans_table[t].threecode[0] != '\0' ) {
if (strcmp (three_code, trans_table[t].threecode) == 0)
return trans_table[t].twocode;
t++;
}
return three_code;
}
#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
/* Read certain variables from EFI and populate debian-installer, as required.
* At the moment, just read Lang"
* Check out the
*/
int main (int argc ATTRIBUTE_UNUSED, char *argv[] ATTRIBUTE_UNUSED)
{
char lang_code[4];
static struct debconfclient *client;
di_system_init("efi-reader");
client = debconfclient_new ();
if (get_efi_lang_code(lang_code))
exit (1);
debconf_set (client, "debian-installer/language", two_code (lang_code));
exit (0);
}
/*
* Local Variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*/
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