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/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/ctype.h>
#include <string.h>
#include <efi/efi-util.h>
static int char_to_nibble(char c)
{
int ret = tolower(c);
return ret <= '9' ? ret - '0' : ret - 'a' + 10;
}
static int read_byte_str(const char *str, u8 *out)
{
if (!isxdigit(*str) || !isxdigit(*(str + 1)))
return -EINVAL;
*out = (char_to_nibble(*str) << 4) | char_to_nibble(*(str + 1));
return 0;
}
static int efi_guid_parse(const char *str, efi_guid_t *guid)
{
int i, ret;
u8 idx[] = { 3, 2, 1, 0, 5, 4, 7, 6, 8, 9, 10, 11, 12, 13, 14, 15 };
for (i = 0; i < 16; i++) {
ret = read_byte_str(str, &guid->b[idx[i]]);
if (ret)
return ret;
str += 2;
switch (i) {
case 3:
case 5:
case 7:
case 9:
if (*str != '-')
return -EINVAL;
str++;
break;
}
}
return 0;
}
int __efivarfs_parse_filename(const char *filename, efi_guid_t *vendor,
s16 *name, size_t *namelen)
{
int len, ret;
const char *guidstr;
int i;
len = strlen(filename);
if (len < sizeof("-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"))
return -EINVAL;
guidstr = filename + len - sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx");
if (*guidstr != '-' || guidstr == filename)
return -EINVAL;
guidstr++;
ret = efi_guid_parse(guidstr, vendor);
if (ret)
return ret;
if (guidstr - filename > *namelen)
ret = -EFBIG;
*namelen = guidstr - filename;
if (ret)
return ret;
for (i = 0; i < *namelen - 1; i++)
name[i] = filename[i];
name[i] = L'\0';
return 0;
}
int efivarfs_parse_filename(const char *filename, efi_guid_t *vendor,
s16 **name)
{
int ret;
s16 *varname;
size_t namelen = 0;
int i;
if (*filename == '/')
filename++;
ret = __efivarfs_parse_filename(filename, vendor, NULL, &namelen);
if (ret != -EFBIG)
return ret;
varname = xzalloc(namelen * sizeof(s16));
for (i = 0; i < namelen - 1; i++)
varname[i] = filename[i];
varname[i] = L'\0';
*name = varname;
return 0;
}
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