[PATCH 2/8] lib: printf code %pUs for GUID text representation

[Heinrich Schuchardt]

In different places text representations are used for GUIDs, e.g.

* command efidebug
* command part list for GPT partitions

To allow reducing code duplication introduce a new printf code %pUs.
It will call uuid_guid_get_str() to get a text representation. If none is
found it will fallback to %pUl and print a hexadecimal representation.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
 lib/vsprintf.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index de9f236b90..2c0cc1647e 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -255,8 +255,8 @@ static char *number(char *buf, char *end, u64 num,
 	return buf;
 }
 
-static char *string(char *buf, char *end, char *s, int field_width,
-		int precision, int flags)
+static char *string(char *buf, char *end, const char *s, int field_width,
+		    int precision, int flags)
 {
 	int len, i;
 
@@ -387,12 +387,14 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
  *   %pUB:   01020304-0506-0708-090A-0B0C0D0E0F10
  *   %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10
  *   %pUL:   04030201-0605-0807-090A-0B0C0D0E0F10
+ *   %pUs:   GUID text representation if known or fallback to %pUl
  */
 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;
+	const char *str;
 
 	switch (*(++fmt)) {
 	case 'L':
@@ -404,6 +406,13 @@ static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
 	case 'B':
 		str_format = UUID_STR_FORMAT_STD | UUID_STR_UPPER_CASE;
 		break;
+	case 's':
+		str = uuid_guid_get_str(addr);
+		if (str)
+			return string(buf, end, str,
+				      field_width, precision, flags);
+		str_format = UUID_STR_FORMAT_GUID;
+		break;
 	default:
 		str_format = UUID_STR_FORMAT_STD;
 		break;
-- 
2.33.1