+ return result;
+}
+
+/**
+ * State information for __sn_put_char()
+ */
+struct __sn_state
+{
+ char *str;
+ size_t len;
+};
+
+/**
+ * formatted_write() callback used [v]snprintf().
+ */
+static void __sn_put_char(char c, void *ptr)
+{
+ struct __sn_state *state = (struct __sn_state *)ptr;
+
+ if (state->len)
+ {
+ --state->len;
+ *state->str++ = c;
+ }
+}
+
+
+int PGM_FUNC(vsnprintf)(char *str, size_t size, const char * PGM_ATTR fmt, va_list ap)
+{
+ int result = 0;
+
+ /* Make room for traling '\0'. */
+ if (size--)
+ {
+ if (str)
+ {
+ struct __sn_state state;
+ state.str = str;
+ state.len = size;
+
+ result = PGM_FUNC(_formatted_write)(fmt, __sn_put_char, &state, ap);
+
+ /* Terminate string. */
+ *state.str = '\0';
+ }
+ else
+ result = PGM_FUNC(_formatted_write)(fmt, __null_put_char, 0, ap);
+ }
+
+ return result;
+}
+
+
+int PGM_FUNC(snprintf)(char *str, size_t size, const char * fmt, ...)
+{
+ int result;
+ va_list ap;
+
+ va_start(ap, fmt);
+ result = PGM_FUNC(vsnprintf)(str, size, fmt, ap);
+ va_end(ap);