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lib/vsprintf: allow printing upper case GUIDs

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In the UEFI context GUIDs are expected to be rendered in upper case.

The patch uses the formerly unused bit 1 of the parameter str_format
of function uuid_bin_to_str() to indicate if we need upper or lower case
output.

Function uuid_string() in vsprint.c is adjusted to correctly set the bit
depending on the print format code.

%pUb: 01020304-0506-0708-090a-0b0c0d0e0f10
%pUB: 01020304-0506-0708-090A-0B0C0D0E0F10
%pUl: 04030201-0605-0807-090a-0b0c0d0e0f10
%pUL: 04030201-0605-0807-090A-0B0C0D0E0F10

Up to this point only a diagnostic message in mount_ubifs() using '%pUB' is
concerned by the change. Further patches are needed to adjust the UEFI
subsystem.

A unit test is provided inside the ut_print command.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-04-29 08:08:43 +02:00 • committed by Tom Rini
parent dbbb1c43f2
commit 3bad256f5b
4 changed files with 50 additions and 17 deletions
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10
include/uuid.h
View file

@ -6,6 +6,8 @@
#ifndef __UUID_H__
#define __UUID_H__
#include <linux/bitops.h>
/* This is structure is in big-endian */
struct uuid {
unsigned int time_low;
@ -16,10 +18,10 @@ struct uuid {
unsigned char node[6];
} __packed;
enum {
UUID_STR_FORMAT_STD,
UUID_STR_FORMAT_GUID
};
/* Bits of a bitmask specifying the output format for GUIDs */
#define UUID_STR_FORMAT_STD 0
#define UUID_STR_FORMAT_GUID BIT(0)
#define UUID_STR_UPPER_CASE BIT(1)
#define UUID_STR_LEN 36
#define UUID_BIN_LEN sizeof(struct uuid)

20
lib/uuid.c
View file

@ -187,9 +187,10 @@ int uuid_str_to_bin(char *uuid_str, unsigned char *uuid_bin, int str_format)
/*
* uuid_bin_to_str() - convert big endian binary data to string UUID or GUID.
*
* @param uuid_bin - pointer to binary data of UUID (big endian) [16B]
* @param uuid_str - pointer to allocated array for output string [37B]
* @str_format - UUID string format: 0 - UUID; 1 - GUID
* @param uuid_bin: pointer to binary data of UUID (big endian) [16B]
* @param uuid_str: pointer to allocated array for output string [37B]
* @str_format: bit 0: 0 - UUID; 1 - GUID
* bit 1: 0 - lower case; 2 - upper case
*/
void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, int str_format)
{
@ -198,6 +199,7 @@ void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, int str_format)
const u8 guid_char_order[UUID_BIN_LEN] = {3, 2, 1, 0, 5, 4, 7, 6, 8,
9, 10, 11, 12, 13, 14, 15};
const u8 *char_order;
const char *format;
int i;
/*
@ -205,13 +207,17 @@ void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, int str_format)
* 4B-2B-2B-2B-6B
* be be be be be
*/
if (str_format == UUID_STR_FORMAT_STD)
char_order = uuid_char_order;
else
if (str_format & UUID_STR_FORMAT_GUID)
char_order = guid_char_order;
else
char_order = uuid_char_order;
if (str_format & UUID_STR_UPPER_CASE)
format = "%02X";
else
format = "%02x";
for (i = 0; i < 16; i++) {
sprintf(uuid_str, "%02x", uuid_bin[char_order[i]]);
sprintf(uuid_str, format, uuid_bin[char_order[i]]);
uuid_str += 2;
switch (i) {
case 3:

14
lib/vsprintf.c
View file

@ -383,29 +383,31 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
#ifdef CONFIG_LIB_UUID
/*
* This works (roughly) the same way as linux's, but we currently always
* print lower-case (ie. we just keep %pUB and %pUL for compat with linux),
* mostly just because that is what uuid_bin_to_str() supports.
* This works (roughly) the same way as Linux's.
*
* %pUb: 01020304-0506-0708-090a-0b0c0d0e0f10
* %pUB: 01020304-0506-0708-090A-0B0C0D0E0F10
* %pUl: 04030201-0605-0807-090a-0b0c0d0e0f10
* %pUL: 04030201-0605-0807-090A-0B0C0D0E0F10
*/
static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
int precision, int flags, const char *fmt)
{
char uuid[UUID_STR_LEN + 1];
int str_format = UUID_STR_FORMAT_STD;
int str_format;
switch (*(++fmt)) {
case 'L':
str_format = UUID_STR_FORMAT_GUID | UUID_STR_UPPER_CASE;
break;
case 'l':
str_format = UUID_STR_FORMAT_GUID;
break;
case 'B':
case 'b':
/* this is the default */
str_format = UUID_STR_FORMAT_STD | UUID_STR_UPPER_CASE;
break;
default:
str_format = UUID_STR_FORMAT_STD;
break;
}

23
test/print_ut.c
View file

@ -15,6 +15,26 @@
#define FAKE_BUILD_TAG "jenkins-u-boot-denx_uboot_dm-master-build-aarch64" \
"and a lot more text to come"
/* Test printing GUIDs */
static void guid_ut_print(void)
{
#if CONFIG_IS_ENABLED(LIB_UUID)
unsigned char guid[16] = {
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
};
char str[40];
sprintf(str, "%pUb", guid);
assert(!strcmp("01020304-0506-0708-090a-0b0c0d0e0f10", str));
sprintf(str, "%pUB", guid);
assert(!strcmp("01020304-0506-0708-090A-0B0C0D0E0F10", str));
sprintf(str, "%pUl", guid);
assert(!strcmp("04030201-0605-0807-090a-0b0c0d0e0f10", str));
sprintf(str, "%pUL", guid);
assert(!strcmp("04030201-0605-0807-090A-0B0C0D0E0F10", str));
#endif
}
/* Test efi_loader specific printing */
static void efi_ut_print(void)
{
@ -117,6 +137,9 @@ static int do_ut_print(cmd_tbl_t *cmdtp, int flag, int argc,
/* Test efi_loader specific printing */
efi_ut_print();
/* Test printing GUIDs */
guid_ut_print();
printf("%s: Everything went swimmingly\n", __func__);
return 0;
}