[U-Boot] [PATCH] vsprintf.c: add GUID printing

[Rob Clark <robdclark@gmail.com>]

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.

  %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
  %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10

It will be used by a later efi_loader paths for efi variables and for
device-path-to-text protocol, and also quite useful for debug prints
of protocol GUIDs.

Signed-off-by: Rob Clark <robdclark@gmail.com>
---
This replaces "efi_loader: add guidstr helper" in my "enough UEFI for
standard distro boot" patchset, and could also replace Heinrich's
"efi_loader: write protocol GUID in OpenProtocol" with a single one-
line debug() print.

 include/config_fallbacks.h |  1 +
 lib/vsprintf.c             | 46 ++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/include/config_fallbacks.h b/include/config_fallbacks.h
index 961a83d758..56b9de09f2 100644
--- a/include/config_fallbacks.h
+++ b/include/config_fallbacks.h
@@ -57,6 +57,7 @@
 
 #if (CONFIG_IS_ENABLED(PARTITION_UUIDS) || \
 	CONFIG_IS_ENABLED(EFI_PARTITION) || \
+	CONFIG_IS_ENABLED(EFI_LOADER) || \
 	defined(CONFIG_RANDOM_UUID) || \
 	defined(CONFIG_CMD_UUID) || \
 	defined(CONFIG_BOOTP_PXE)) && \
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 0c40f852ce..156fda5ad6 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -18,6 +18,7 @@
 
 #include <common.h>
 #include <charset.h>
+#include <uuid.h>
 
 #include <div64.h>
 #define noinline __attribute__((noinline))
@@ -366,6 +367,40 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 }
 #endif
 
+#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.
+ *
+ *   %pUb:   01020304-0506-0708-090a-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;
+
+	switch (*(++fmt)) {
+	case 'L':
+	case 'l':
+		str_format = UUID_STR_FORMAT_GUID;
+		break;
+	case 'B':
+	case 'b':
+		/* this is the default */
+		break;
+	default:
+		break;
+	}
+
+	uuid_bin_to_str(addr, uuid, str_format);
+
+	return string(buf, end, uuid, field_width, precision, flags);
+}
+#endif
+
 /*
  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
  * by an extra set of alphanumeric characters that are extended format
@@ -399,8 +434,8 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 			      flags);
 #endif
 
-#ifdef CONFIG_CMD_NET
 	switch (*fmt) {
+#ifdef CONFIG_CMD_NET
 	case 'a':
 		flags |= SPECIAL | ZEROPAD;
 
@@ -430,8 +465,15 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 					       precision, flags);
 		flags &= ~SPECIAL;
 		break;
-	}
 #endif
+#ifdef CONFIG_LIB_UUID
+	case 'U':
+		return uuid_string(buf, end, ptr, field_width, precision,
+				   flags, fmt);
+#endif
+	default:
+		break;
+	}
 	flags |= SMALL;
 	if (field_width == -1) {
 		field_width = 2*sizeof(void *);
-- 
2.13.0