- * body = rfc822_body(msg);
- * fwrite(body.ptr, 1, body.len, stdout);
+ * if (!argv[1] || !argv[1][0])
+ * out = rfc822_body(msg);
+ * else {
+ * struct rfc822_header *hdr;
+ * hdr = rfc822_first_header_of_name(msg, argv[1]);
+ * if (!hdr)
+ * exit(1);
+ * out = rfc822_header_unfolded_value(msg, hdr);
+ * }
+ * fwrite(out.ptr, 1, out.len, stdout);
+ * rfc822_free(msg);