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imap.c:651:12: warning: comparison of unsigned expression < 0 is always false [-Wtautological-compare]
                        if (len < 0) {
                            ~~~ ^ ~

1027c1059,1063
< unsigned int encode_mbox_indices(unsigned int mb, unsigned int msg)/*{{{*/
---
> #define SHIFTBITS 24  /* how many bits to use to count messages */
> #define SHIFTMASKMBS ((1<<(32-SHIFTBITS))-1)
> #define SHIFTMASKMSGS ((1<<SHIFTBITS)-1)
>
> inline unsigned int encode_mbox_indices(unsigned int mb, unsigned int msg)/*{{{*/
1029,1031c1065
<   unsigned int result;
<   result = ((mb & 0xffff) << 16) | (msg & 0xffff);
<   return result;
---
>   return (mb << SHIFTBITS) | msg;
1034c1068
< void decode_mbox_indices(unsigned int index, unsigned int *mb, unsigned int *msg)/*{{{*/
---
> inline void decode_mbox_indices(unsigned int myindex, unsigned int *mb, unsigned int *msg)/*{{{*/
1036,1037c1070,1071
<   *mb = (index >> 16) & 0xffff;
<   *msg = (index & 0xffff);
---
>   *mb = (myindex >> SHIFTBITS) & SHIFTMASKMBS;
>   *msg = (myindex & SHIFTMASKMSGS);
1044,1045c1078,1080
<   if (db->n_mboxen > 65536) {
<     fprintf(stderr, "Too many mboxes (max 65536, you have %d)\n", db->n_mboxen);
---
>   if (db->n_mboxen >= SHIFTMASKMBS) {
>     fprintf(stderr, "Too many mboxes (max %d, you have %d)\n",
>               SHIFTMASKMBS, db->n_mboxen);
1050,1052c1085,1087
<     if (db->mboxen[i].n_msgs > 65536) {
<       fprintf(stderr, "Too many messages in mbox %s (max 65536, you have %d)\n",
<               db->mboxen[i].path, db->mboxen[i].n_msgs);
---
>     if (db->mboxen[i].n_msgs >= SHIFTMASKMSGS) {
>       fprintf(stderr, "Too many messages in mbox %s (max %d, you have %d)\n",
>               db->mboxen[i].path, SHIFTMASKMSGS, db->mboxen[i].n_msgs);

lseek '/path/to/db': Invalid argument

Content-Type: application/pdf; name*=UTF-8''filename.pdf;

foo

Program received signal SIGSEGV, Segmentation fault.
0x000055555556b085 in make_nvp (src=src@entry=0x555555778ac0 <result>, 
    s=0x55555577f43d " application/pdf; name*=UTF-8''filename.pdf;", 
    s@entry=0x55555577f430 "Content-Type: application/pdf; name*=UTF-8''filename.pdf;", pfx=pfx@entry=0x555555570a1c "content-type:") at nvp.c:279

#0  0x000055555556b085 in make_nvp (src=src@entry=0x555555778ac0 <result>, 
    s=0x55555577f43d " application/pdf; name*=UTF-8''filename.pdf;", 
    s@entry=0x55555577f430 "Content-Type: application/pdf; name*=UTF-8''filename.pdf;", pfx=pfx@entry=0x555555570a1c "content-type:") at nvp.c:279
        current_state = 2
        tok = <optimized out>
        q = 0x55555577f469 ""
        tempsrc = 0x0
        tempdst = 0x0
        qq = <optimized out>
        name = 0x0
        minor = 0x55555577f520 "UTF-8"
        value = 0x0
        copy_start = 0x55555577f468 ";"
        last_action = GOT_NAMEVALUE_CSET
        current_action = <optimized out>
        last_copier = COPY_NOWHERE
        result = <optimized out>
        pfxlen = <optimized out>
#1  0x000055555555d114 in data_to_rfc822 (
    src=src@entry=0x555555778ac0 <result>, 
    data=0x7fcadd6b5000 "Content-Type: application/pdf; name*=UTF-8''filename.pdf;\n\nfoo\n\n", length=64, error=error@entry=0x0) at rfc822.c:1031
        body_start = 0x7fcadd6b503b "foo\n\n"
        header = {next = 0x55555577f480, prev = 0x55555577f480, 
          text = 0x3499309 <error: Cannot access memory at address 0x3499309>}
        x = 0x55555577f480
        nx = <optimized out>
        ct_nvp = 0x0
        cte_nvp = 0x0
        cd_nvp = 0x0
        nvp = <optimized out>
        body_len = <optimized out>
#2  0x000055555555ead4 in make_rfc822 (
    filename=filename@entry=0x55555577f410 "/tmp/bug.mh/1") at rfc822.c:1435
        len = 64
        data = 0x7fcadd6b5000 "Content-Type: application/pdf; name*=UTF-8''filename.pdf;\n\nfoo\n\n"
        result = 0x0
#3  0x000055555555b9e3 in scan_new_messages (imapc=<optimized out>, 
    start_at=<optimized out>, db=<optimized out>) at db.c:755
        msg = 0x0
        len = <optimized out>
        i = 0
#4  update_database (db=0x55555577b6a0, sorted_paths=<optimized out>, 
    n_msgs=<optimized out>, do_fast_index=<optimized out>, 
    imapc=<optimized out>) at db.c:1085
        matched_index = <optimized out>
        i = <optimized out>
        any_new = 1
        n_newly_pruned = <optimized out>
        n_already_dead = <optimized out>
        __PRETTY_FUNCTION__ = "update_database"
#5  0x00005555555574e7 in main (argc=<optimized out>, argv=<optimized out>)

$ rm /tmp/mairix.database.*; mairix -v -F -p -f /tmp/.mairixrc 2>&1 
mairix DEVELOPMENT, Copyright (C) 2002-2010 Richard P. Curnow
mairix comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; see the GNU General Public License for details.

Finding all currently existing messages...
Reading existing database...
Checking message path integrity
Checking to
Checking cc
Checking from
Checking subject
Checking body
Checking attachment_name
Loaded 1 existing messages
Scanning mbox /tmp/test-mailbox : 100% done
1 newly dead messages, 1 messages now dead in total
Out of memory (at rfc822.c:465, -203 bytes)

 $ mairix -v -p

mairix DEVELOPMENT, Copyright (C) 2002-2010 Richard P. Curnow
mairix comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; see the GNU General Public License for details.

Finding all currently existing messages...
Reading existing database...
Assertion failed: (nt->match1.highest < n_msgs), function import_toktable2, file db.c, line 412.
Abort trap: 6

Wrote 32603 messages (652060 bytes of tables, 2899041 bytes of text)
Wrote 0 mbox headers (0 bytes of tables, 0 bytes of paths)
Wrote 0 bytes of mbox message checksums
To: Wrote 11795 tokens (94360 bytes of tables, 170867 bytes of text, 259613 bytes of hit encoding)
Cc: Wrote 3563 tokens (28504 bytes of tables, 48724 bytes of text, 41836 bytes of hit encoding)
From: Wrote 7844 tokens (62752 bytes of tables, 106980 bytes of text, 225559 bytes of hit encoding)
Subject: Wrote 11748 tokens (93984 bytes of tables, 88691 bytes of text, 206157 bytes of hit encoding)
Body: Wrote 579794 tokens (4638352 bytes of tables, 5200170 bytes of text, 7717808 bytes of hit encoding)
Attachment Name: Wrote 5522 tokens (44176 bytes of tables, 129209 bytes of text, 23229 bytes of hit encoding)
(Threading): Wrote 34405 tokens (275240 bytes of tables, 1705835 bytes of text, 301234 bytes of hit encoding)