+static char mutt_normalized_char (char c)
+{
+ if (isalnum (c))
+ return c;
+ if (strchr (".!#$%&'*+-/=?^_`{|}~", c))
+ return c;
+ return '.'; /* normalized character (we're stricter than RFC2822, 3.6.4) */
+}
+
+static void mutt_gen_localpart (char *buf, unsigned int len, char *fmt)
+{
+ time_t now;
+ struct tm *tm;
+ char tmp[SHORT_STRING];
+
+ *buf = '\0';
+
+ now = time (NULL);
+ tm = gmtime (&now);
+
+ for (; *fmt; ++fmt) {
+ if (*fmt == '%') {
+ switch (fmt[1]) {
+ case 0:
+ return;
+ case 'd':
+ snprintf (tmp, sizeof (tmp), "%02d", tm->tm_mday);
+ safe_strncat (buf, len, tmp, 2);
+ break;
+ case 'h':
+ snprintf (tmp, sizeof (tmp), "%02d", tm->tm_hour);
+ safe_strncat (buf, len, tmp, 2);
+ break;
+ case 'm':
+ snprintf (tmp, sizeof (tmp), "%02d", tm->tm_mon + 1);
+ safe_strncat (buf, len, tmp, 2);
+ break;
+ case 'M':
+ snprintf (tmp, sizeof (tmp), "%02d", tm->tm_min);
+ safe_strncat (buf, len, tmp, 2);
+ break;
+ case 'O':
+ snprintf (tmp, sizeof (tmp), "%lo", (unsigned long) now);
+ safe_strncat (buf, len, tmp, mutt_strlen (tmp));
+ break;
+ case 'p':
+ snprintf (tmp, sizeof (tmp), "%u", (unsigned int) getpid ());
+ safe_strncat (buf, len, tmp, mutt_strlen (tmp));
+ break;
+ case 'P':
+ snprintf (tmp, sizeof (tmp), "%c", MsgIdPfx);
+ MsgIdPfx = (MsgIdPfx == 'Z') ? 'A' : MsgIdPfx + 1;
+ safe_strncat (buf, len, tmp, 1);
+ break;
+ case 'r':
+ snprintf (tmp, sizeof (tmp), "%u", (unsigned int) rand ());
+ safe_strncat (buf, len, tmp, mutt_strlen (tmp));
+ break;
+ case 'R':
+ snprintf (tmp, sizeof (tmp), "%x", (unsigned int) rand ());
+ safe_strncat (buf, len, tmp, mutt_strlen (tmp));
+ break;
+ case 's':
+ snprintf (tmp, sizeof (tmp), "%02d", tm->tm_sec);
+ safe_strncat (buf, len, tmp, 2);
+ break;
+ case 'T':
+ snprintf (tmp, sizeof (tmp), "%u", (unsigned int) now);
+ safe_strncat (buf, len, tmp, mutt_strlen (tmp));
+ break;
+ case 'X':
+ snprintf (tmp, sizeof (tmp), "%x", (unsigned int) now);
+ safe_strncat (buf, len, tmp, mutt_strlen (tmp));
+ break;
+ case 'Y':
+ snprintf (tmp, sizeof (tmp), "%04d", tm->tm_year + 1900); /* this will break in the year 10000 ;-) */
+ safe_strncat (buf, len, tmp, 4);
+ break;
+ case '%':
+ safe_strncat (buf, len, "%", 1);
+ break;
+ default:
+ safe_strncat (buf, len, ".", 1); /* invalid formats are replaced by '.' */
+ } /* switch */
+ ++fmt;
+ }
+ else {
+ char c;
+
+ c = mutt_normalized_char (*fmt); /* @todo: filter out invalid characters */
+ safe_strncat (buf, len, &c, 1);
+ }
+ }
+}
+