+ return result;
+}
+
+static char *tzoffset(time_t *now)
+/* calculate timezone offset */
+{
+ static char offset_string[6];
+ struct tm gmt, *lt;
+ int off;
+ char sign = '+';
+
+ gmt = *gmtime(now);
+ lt = localtime(now);
+ off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;
+ if (lt->tm_year < gmt.tm_year)
+ off -= 24 * 60;
+ else if (lt->tm_year > gmt.tm_year)
+ off += 24 * 60;
+ else if (lt->tm_yday < gmt.tm_yday)
+ off -= 24 * 60;
+ else if (lt->tm_yday > gmt.tm_yday)
+ off += 24 * 60;
+ if (off < 0) {
+ sign = '-';
+ off = -off;
+ }
+ if (off >= 24 * 60) /* should be impossible */
+ off = 23 * 60 + 59; /* if not, insert silly value */
+ snprintf(offset_string, sizeof(offset_string),
+ "%c%02d%02d", sign, off / 60, off % 60);
+ return (offset_string);
+}
+
+char *rfc822timestamp(void)
+/* return a timestamp in RFC822 form */
+{
+ time_t now;
+ static char buf[50];
+
+ time(&now);
+#ifdef HAVE_STRFTIME
+ /*
+ * Conform to RFC822. We generate a 4-digit year here, avoiding
+ * Y2K hassles. Max length of this timestamp in an English locale
+ * should be 29 chars. The only things that should vary by locale
+ * are the day and month abbreviations. The set_locale calls prevent
+ * weird multibyte i18n characters (such as kanji) from showing up
+ * in your Received headers.
+ */
+#if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS)
+ setlocale (LC_TIME, "C");
+#endif
+ strftime(buf, sizeof(buf)-1,
+ "%a, %d %b %Y %H:%M:%S XXXXX (%Z)", localtime(&now));
+#if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS)
+ setlocale (LC_TIME, "");
+#endif
+ strncpy(strstr(buf, "XXXXX"), tzoffset(&now), 5);
+#else
+ /*
+ * This is really just a portability fallback, as the
+ * date format ctime(3) emits is not RFC822
+ * conformant.
+ */
+ strlcpy(buf, ctime(&now), sizeof(buf));
+ buf[strlen(buf)-1] = '\0'; /* remove trailing \n */
+#endif /* HAVE_STRFTIME */
+
+ return(buf);