I've found and fixed a bug in NMH that will cause a SEGV when sorting a
folder that contains improperly formatted EMail.  Any message that is
missing the blank following ':' on the 'Subject: ' line can cause this
SEGV.  Try it!  Take a folder with a bunch of EMail, pick one message at
random and remove that blank.  (i.e., "Subject:This is the subject") then
sort by subject.

$ sortm +foldername -textfield subject -limit 0

You will get a SEGV.  A patch is below:

[root@kilroy uip]# diff -au sortm.c sortm_new.c
--- sortm.c     Thu Dec  3 17:23:11 1998
+++ sortm_new.c Sun Nov  7 11:55:49 1999
@@ -440,6 +440,7 @@
                        else {
                            if (isalnum(c))
                                *cp2++ = isupper(c) ? tolower(c) : c;
+                           cp++;
                            break;
                        }
                    }


Adding that one line (the "cp++;" line) fixes the bug.  I have notified the
NMH maintainer (Richard Coleman) by EMail, but have not yet heard back.  I
Emailed him on 7 Nov.  I thought I would post a bugfix here so at least
RedHat could get the fix.  This bug is really annoying, as there are people
with this sort of malformatted EMail posting to the redhat lists!