From: Oliver Steffen <osteffen@redhat.com>
Date: Fri, 26 May 2023 11:35:48 +0000 (+0200)
Subject: efi: Add grub_efi_set_variable_to_string()
X-Git-Tag: grub-2.12-rc1~45
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e83a88f6ea7f97d643387681fe044f45dcd732b9;p=thirdparty%2Fgrub.git

efi: Add grub_efi_set_variable_to_string()

Add a function that sets an EFI variable to a string value.
The string is converted from UTF-8 to UTF-16.

Signed-off-by: Oliver Steffen <osteffen@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---

diff --git a/grub-core/kern/efi/efi.c b/grub-core/kern/efi/efi.c
index bd3b125a4..f54fdcacd 100644
--- a/grub-core/kern/efi/efi.c
+++ b/grub-core/kern/efi/efi.c
@@ -286,6 +286,28 @@ grub_efi_get_variable_with_attributes (const char *var,
   return status;
 }
 
+grub_err_t
+grub_efi_set_variable_to_string (const char *name, const grub_guid_t *guid,
+			         const char *value, grub_efi_uint32_t attributes)
+{
+  grub_efi_char16_t *value_16;
+  grub_ssize_t len16;
+  grub_err_t status;
+
+  len16 = grub_utf8_to_utf16_alloc (value, &value_16, NULL);
+
+  if (len16 < 0)
+    return grub_errno;
+
+  status = grub_efi_set_variable_with_attributes (name, guid,
+			(void *) value_16, (len16 + 1) * sizeof (value_16[0]),
+			attributes);
+
+  grub_free (value_16);
+
+  return status;
+}
+
 grub_efi_status_t
 grub_efi_get_variable (const char *var, const grub_guid_t *guid,
 		       grub_size_t *datasize_out, void **data_out)
diff --git a/include/grub/efi/efi.h b/include/grub/efi/efi.h
index 3d056a0a4..cd977cbbc 100644
--- a/include/grub/efi/efi.h
+++ b/include/grub/efi/efi.h
@@ -108,6 +108,9 @@ EXPORT_FUNC (grub_efi_set_variable) (const char *var,
 				     const grub_guid_t *guid,
 				     void *data,
 				     grub_size_t datasize);
+grub_err_t
+EXPORT_FUNC (grub_efi_set_variable_to_string) (const char *name, const grub_guid_t *guid,
+					       const char *value, grub_efi_uint32_t attributes);
 int
 EXPORT_FUNC (grub_efi_compare_device_paths) (const grub_efi_device_path_t *dp1,
 					     const grub_efi_device_path_t *dp2);