+/* unquote.h -- Handle quote removal and quoted-pair strings on
+ * RFC 2822-5322 atoms.
+ *
+ * This code is Copyright (c) 2017, by the authors of nmh. See the
+ * COPYRIGHT file in the root directory of the nmh distribution for
+ * complete copyright information.
+ */
+
+/* Remove quotes and quoted-pair sequences from RFC-5322 atoms.
+ *
+ * Currently the actual algorithm is simpler than it technically should
+ * be: any quotes are simply eaten, unless they're preceded by the escape
+ * character (\). This seems to be sufficient for our needs for now.
+ *
+ * Arguments:
+ *
+ * input - The input string
+ * output - The output string; is assumed to have at least as much
+ * room as the input string. At worst the output string
+ * will be the same size as the input string; it might be
+ * smaller. */
+void unquote_string(const char *input, char *output);