[PATCH v2 3/8] lib/uuid: introduce few more generic helpers for UUID

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

There are new helpers in this patch:

uuid_is_valid		checks if a UUID is valid
uuid_be_to_bin		converts from string to binary (big endian)
uuid_le_to_bin		converts from string to binary (little endian)

They will be used in future, i.e. in the following patches in the series.

This also moves indices arrays to lib/uuid.c to be shared accross modules.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 include/linux/uuid.h | 13 ++++++++++
 lib/uuid.c           | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/vsprintf.c       |  9 +++----
 3 files changed, 87 insertions(+), 5 deletions(-)

diff --git a/include/linux/uuid.h b/include/linux/uuid.h
index 91c2b6d..616347f 100644
--- a/include/linux/uuid.h
+++ b/include/linux/uuid.h
@@ -22,6 +22,11 @@
 
 #include <uapi/linux/uuid.h>
 
+/*
+ * The length of a UUID string ("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")
+ * not including trailing NUL.
+ */
+#define	UUID_STRING_LEN		36
 
 static inline int uuid_le_cmp(const uuid_le u1, const uuid_le u2)
 {
@@ -38,4 +43,12 @@ void generate_random_uuid(unsigned char uuid[16]);
 extern void uuid_le_gen(uuid_le *u);
 extern void uuid_be_gen(uuid_be *u);
 
+int __must_check uuid_is_valid(const char *uuid);
+
+extern const u8 uuid_le_index[16];
+extern const u8 uuid_be_index[16];
+
+int uuid_le_to_bin(const char *uuid, uuid_le *u);
+int uuid_be_to_bin(const char *uuid, uuid_be *u);
+
 #endif
diff --git a/lib/uuid.c b/lib/uuid.c
index 6c81c0b..995865c 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -19,10 +19,17 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/errno.h>
 #include <linux/export.h>
 #include <linux/uuid.h>
 #include <linux/random.h>
 
+const u8 uuid_le_index[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
+EXPORT_SYMBOL(uuid_le_index);
+const u8 uuid_be_index[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
+EXPORT_SYMBOL(uuid_be_index);
+
 /***************************************************************
  * Random UUID interface
  *
@@ -65,3 +72,66 @@ void uuid_be_gen(uuid_be *bu)
 	bu->b[6] = (bu->b[6] & 0x0F) | 0x40;
 }
 EXPORT_SYMBOL_GPL(uuid_be_gen);
+
+/**
+  * uuid_is_valid - checks if UUID string valid
+  * @uuid:	UUID string to check
+  *
+  * Description:
+  * It checks if the UUID string is following the format:
+  *	xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+  * where x is a hex digit.
+  *
+  * Return: 0 on success, %-EINVAL otherwise.
+  */
+int uuid_is_valid(const char *uuid)
+{
+	unsigned int i;
+
+	if (strnlen(uuid, UUID_STRING_LEN) < UUID_STRING_LEN)
+		return -EINVAL;
+
+	for (i = 0; i < UUID_STRING_LEN; i++) {
+		if (i == 8 || i == 13 || i == 18 || i == 23) {
+			if (uuid[i] != '-')
+				return -EINVAL;
+		} else if (!isxdigit(uuid[i])) {
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(uuid_is_valid);
+
+static int __uuid_to_bin(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;
+	int ret;
+
+	ret = uuid_is_valid(uuid);
+	if (ret)
+		return ret;
+
+	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 uuid_le_to_bin(const char *uuid, uuid_le *u)
+{
+	return __uuid_to_bin(uuid, u->b, uuid_le_index);
+}
+EXPORT_SYMBOL(uuid_le_to_bin);
+
+int uuid_be_to_bin(const char *uuid, uuid_be *u)
+{
+	return __uuid_to_bin(uuid, u->b, uuid_be_index);
+}
+EXPORT_SYMBOL(uuid_be_to_bin);
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index be0e7cf..0967771 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -30,6 +30,7 @@
 #include <linux/ioport.h>
 #include <linux/dcache.h>
 #include <linux/cred.h>
+#include <linux/uuid.h>
 #include <net/addrconf.h>
 #ifdef CONFIG_BLOCK
 #include <linux/blkdev.h>
@@ -1304,19 +1305,17 @@ static noinline_for_stack
 char *uuid_string(char *buf, char *end, const u8 *addr,
 		  struct printf_spec spec, const char *fmt)
 {
-	char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
+	char uuid[UUID_STRING_LEN + 1];
 	char *p = uuid;
 	int i;
-	static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
-	static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
-	const u8 *index = be;
+	const u8 *index = uuid_be_index;
 	bool uc = false;
 
 	switch (*(++fmt)) {
 	case 'L':
 		uc = true;		/* fall-through */
 	case 'l':
-		index = le;
+		index = uuid_le_index;
 		break;
 	case 'B':
 		uc = true;
-- 
2.8.0.rc3