[efi] Add efi_sprintf() and efi_vsprintf()

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

src/include/ipxe/efi/efi_strings.h

@@ -20,4 +20,27 @@ extern int efi_vssnprintf ( wchar_t *wbuf, ssize_t swsize, const char *fmt,
 extern int efi_ssnprintf ( wchar_t *wbuf, ssize_t swsize,
 			   const char *fmt, ... );
 
+/**
+ * Write a formatted string to a wide-character buffer
+ *
+ * @v wbuf		Buffer into which to write the string
+ * @v fmt		Format string
+ * @v args		Arguments corresponding to the format string
+ * @ret wlen		Length of formatted string (in wide characters)
+ */
+static inline int efi_vsprintf ( wchar_t *buf, const char *fmt, va_list args ) {
+	return efi_vsnprintf ( buf, ~( ( size_t ) 0 ), fmt, args );
+}
+
+/**
+ * Write a formatted string to a buffer
+ *
+ * @v wbuf		Buffer into which to write the string
+ * @v fmt		Format string
+ * @v ...		Arguments corresponding to the format string
+ * @ret wlen		Length of formatted string (in wide characters)
+ */
+#define efi_sprintf( buf, fmt, ... ) \
+	efi_snprintf ( (buf), ~( ( size_t ) 0 ), (fmt), ## __VA_ARGS__ )
+
 #endif /* _IPXE_EFI_STRINGS_H */