lib/uuid.c

Source file repositories/reference/linux-study-clean/lib/uuid.c

File Facts

System
Linux kernel
Corpus path
lib/uuid.c
Extension
.c
Size
3013 bytes
Lines
135
Domain
Kernel Services
Bucket
lib
Inferred role
Kernel Services: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

Dependency Surface

Detected Declarations

Annotated Snippet

if (i == 8 || i == 13 || i == 18 || i == 23) {
			if (uuid[i] != '-')
				return false;
		} else if (!isxdigit(uuid[i])) {
			return false;
		}
	}

	return true;
}
EXPORT_SYMBOL(uuid_is_valid);

static int __uuid_parse(const char *uuid, __u8 b[16], const u8 ei[16])
{
	static const u8 si[16] = {0,2,4,6,9,11,14,16,19,21,24,26,28,30,32,34};
	unsigned int i;

	if (!uuid_is_valid(uuid))
		return -EINVAL;

	for (i = 0; i < 16; i++) {
		int hi = hex_to_bin(uuid[si[i] + 0]);
		int lo = hex_to_bin(uuid[si[i] + 1]);

		b[ei[i]] = (hi << 4) | lo;
	}

	return 0;
}

int guid_parse(const char *uuid, guid_t *u)
{
	return __uuid_parse(uuid, u->b, guid_index);
}
EXPORT_SYMBOL(guid_parse);

int uuid_parse(const char *uuid, uuid_t *u)
{
	return __uuid_parse(uuid, u->b, uuid_index);
}
EXPORT_SYMBOL(uuid_parse);

Annotation

Implementation Notes