[efi] Make our virtual file system case insensitive

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/interface/efi/efi_file.c

 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <strings.h>
 #include <errno.h>
 #include <wchar.h>
 #include <ipxe/image.h>
 	return ( file->image ? file->image->name : "<root>" );
 }
 
+/**
+ * Find EFI file image
+ *
+ * @v wname		Filename
+ * @ret image		Image, or NULL
+ */
+static struct image * efi_file_find ( const CHAR16 *wname ) {
+	char name[ wcslen ( wname ) + 1 /* NUL */ ];
+	struct image *image;
+
+	/* Find image */
+	snprintf ( name, sizeof ( name ), "%ls", wname );
+	list_for_each_entry ( image, &images, list ) {
+		if ( strcasecmp ( image->name, name ) == 0 )
+			return image;
+	}
+
+	return NULL;
+
+}
+
 /**
  * Open file
  *
 		CHAR16 *wname, UINT64 mode __unused,
 		UINT64 attributes __unused ) {
 	struct efi_file *file = container_of ( this, struct efi_file, file );
-	char name[ wcslen ( wname ) + 1 /* NUL */ ];
 	struct efi_file *new_file;
 	struct image *image;
 
 	}
 
 	/* Identify image */
-	snprintf ( name, sizeof ( name ), "%ls", wname );
-	image = find_image ( name );
+	image = efi_file_find ( wname );
 	if ( ! image ) {
-		DBGC ( file, "EFIFILE \"%s\" does not exist\n", name );
+		DBGC ( file, "EFIFILE \"%ls\" does not exist\n", wname );
 		return EFI_NOT_FOUND;
 	}