+/*
+ * comparator for two longs in descending order.
+ */
+int longcmp_r(const void *s1, const void *s2) {
+ long l1;
+ long l2;
+
+ l1 = *(long *)GetSearchPayload(s1);
+ l2 = *(long *)GetSearchPayload(s2);
+
+ if (l1 > l2) return(-1);
+ if (l1 < l2) return(+1);
+ return(0);
+}
+
+/*
+ * comparator for longs; descending order.
+ */
+int qlongcmp_r(const void *s1, const void *s2) {
+ long l1 = (long) s1;
+ long l2 = (long) s2;
+
+ if (l1 > l2) return(-1);
+ if (l1 < l2) return(+1);
+ return(0);
+}
+
+
+/*
+ * comparator for message summary structs by ascending subject.
+ */
+int summcmp_subj(const void *s1, const void *s2) {
+ message_summary *summ1;
+ message_summary *summ2;
+
+ summ1 = (message_summary *)GetSearchPayload(s1);
+ summ2 = (message_summary *)GetSearchPayload(s2);
+ return strcasecmp(ChrPtr(summ1->subj), ChrPtr(summ2->subj));
+}
+
+/*
+ * comparator for message summary structs by descending subject.
+ */
+int summcmp_rsubj(const void *s1, const void *s2) {
+ message_summary *summ1;
+ message_summary *summ2;
+
+ summ1 = (message_summary *)GetSearchPayload(s1);
+ summ2 = (message_summary *)GetSearchPayload(s2);
+ return strcasecmp(ChrPtr(summ2->subj), ChrPtr(summ1->subj));
+}
+/*
+ * comparator for message summary structs by descending subject.
+ */
+int groupchange_subj(const void *s1, const void *s2) {
+ message_summary *summ1;
+ message_summary *summ2;
+
+ summ1 = (message_summary *)s1;
+ summ2 = (message_summary *)s2;
+ return ChrPtr(summ2->subj)[0] != ChrPtr(summ1->subj)[0];
+}
+
+/*
+ * comparator for message summary structs by ascending sender.
+ */
+int summcmp_sender(const void *s1, const void *s2) {
+ message_summary *summ1;
+ message_summary *summ2;
+
+ summ1 = (message_summary *)GetSearchPayload(s1);
+ summ2 = (message_summary *)GetSearchPayload(s2);
+ return strcasecmp(ChrPtr(summ1->from), ChrPtr(summ2->from));
+}
+
+/*
+ * comparator for message summary structs by descending sender.
+ */
+int summcmp_rsender(const void *s1, const void *s2) {
+ message_summary *summ1;
+ message_summary *summ2;
+
+ summ1 = (message_summary *)GetSearchPayload(s1);
+ summ2 = (message_summary *)GetSearchPayload(s2);
+ return strcasecmp(ChrPtr(summ2->from), ChrPtr(summ1->from));
+}
+/*
+ * comparator for message summary structs by descending sender.
+ */
+int groupchange_sender(const void *s1, const void *s2) {
+ message_summary *summ1;
+ message_summary *summ2;
+
+ summ1 = (message_summary *)s1;
+ summ2 = (message_summary *)s2;
+ return strcasecmp(ChrPtr(summ2->from), ChrPtr(summ1->from)) != 0;
+
+}
+
+/*
+ * comparator for message summary structs by ascending date.
+ */
+int summcmp_date(const void *s1, const void *s2) {
+ message_summary *summ1;
+ message_summary *summ2;
+
+ summ1 = (message_summary *)GetSearchPayload(s1);
+ summ2 = (message_summary *)GetSearchPayload(s2);
+
+ if (summ1->date < summ2->date) return -1;
+ else if (summ1->date > summ2->date) return +1;
+ else return 0;
+}
+
+/*
+ * comparator for message summary structs by descending date.
+ */
+int summcmp_rdate(const void *s1, const void *s2) {
+ message_summary *summ1;
+ message_summary *summ2;
+
+ summ1 = (message_summary *)GetSearchPayload(s1);
+ summ2 = (message_summary *)GetSearchPayload(s2);
+
+ if (summ1->date < summ2->date) return +1;
+ else if (summ1->date > summ2->date) return -1;
+ else return 0;
+}
+
+/*
+ * comparator for message summary structs by descending date.
+ */
+const long DAYSECONDS = 24 * 60 * 60;
+int groupchange_date(const void *s1, const void *s2) {
+ message_summary *summ1;
+ message_summary *summ2;
+
+ summ1 = (message_summary *)s1;
+ summ2 = (message_summary *)s2;
+
+ return (summ1->date % DAYSECONDS) != (summ2->date %DAYSECONDS);
+}
+
+
+/*----------------------------------------------------------------------------*/
+/* Don't wanna know... or? */
+void examine_pref(message_summary *Msg, StrBuf *HdrLine, StrBuf *FoundCharset) {return;}
+void examine_suff(message_summary *Msg, StrBuf *HdrLine, StrBuf *FoundCharset) {return;}
+void examine_path(message_summary *Msg, StrBuf *HdrLine, StrBuf *FoundCharset) {return;}
+void examine_content_encoding(message_summary *Msg, StrBuf *HdrLine, StrBuf *FoundCharset)
+{
+/* TODO: do we care? */
+}