From 3b3eb196a2480b2671dcd6c14792fefc48f1abb1 Mon Sep 17 00:00:00 2001
From: Jan Janssen <medhefgo@web.de>
Date: Sun, 5 Jun 2022 15:31:01 +0200
Subject: [PATCH] boot: Add device_path_to_str

---
 src/boot/efi/util.c | 19 +++++++++++++++++++
 src/boot/efi/util.h |  1 +
 2 files changed, 20 insertions(+)

diff --git a/src/boot/efi/util.c b/src/boot/efi/util.c
index e17a8e18a4..5547d288de 100644
--- a/src/boot/efi/util.c
+++ b/src/boot/efi/util.c
@@ -769,6 +769,25 @@ EFI_STATUS make_file_device_path(EFI_HANDLE device, const char16_t *file, EFI_DE
         return EFI_SUCCESS;
 }
 
+EFI_STATUS device_path_to_str(const EFI_DEVICE_PATH *dp, char16_t **ret) {
+        EFI_DEVICE_PATH_TO_TEXT_PROTOCOL *dp_to_text;
+        EFI_STATUS err;
+
+        assert(dp);
+        assert(ret);
+
+        err = BS->LocateProtocol(&(EFI_GUID) EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID, NULL, (void **) &dp_to_text);
+        if (err != EFI_SUCCESS)
+                return err;
+
+        char16_t *str = dp_to_text->ConvertDevicePathToText(dp, false, false);
+        if (!str)
+                return EFI_OUT_OF_RESOURCES;
+
+        *ret = str;
+        return EFI_SUCCESS;
+}
+
 #if defined(__i386__) || defined(__x86_64__)
 bool in_hypervisor(void) {
         uint32_t eax, ebx, ecx, edx;
diff --git a/src/boot/efi/util.h b/src/boot/efi/util.h
index be79b205a4..b33c50f9fc 100644
--- a/src/boot/efi/util.h
+++ b/src/boot/efi/util.h
@@ -207,6 +207,7 @@ static inline void beep(UINTN beep_count) {}
 
 EFI_STATUS open_volume(EFI_HANDLE device, EFI_FILE **ret_file);
 EFI_STATUS make_file_device_path(EFI_HANDLE device, const char16_t *file, EFI_DEVICE_PATH **ret_dp);
+EFI_STATUS device_path_to_str(const EFI_DEVICE_PATH *dp, char16_t **ret);
 
 #if defined(__i386__) || defined(__x86_64__)
 bool in_hypervisor(void);