Notes about the code

Basic screen I/O

• uses bare termcap/terminfo, not curses
• output goes to stdout with FLUSH macro: printf("foo\n") FLUSH;
• reposition cursor: s_goxy(x, y);

Subject lines

• orig_line still has newlines when tree_puts() (in rt-wumpus.c) is called
• after orig_line is transformed into line newlines are already lost
  • decode_header() in cache.c

Article selector

• article_selector() in rt-select.c
• display_page() in rt-page.c
• print_lines() is used for the help screen but not on the actual selection page
• display_subject()? ← yes, this is it, grep for "%s%3d (it’s the else statement) → compress_from() in rt-util.c

Article display

• do_article() in art.c – grep “normal line”
• it seems to output characters one byte at a time :-/
• to investigate: putsubstchar() in charsubst.c
• finish_tree()
• art.c:233, p bufptr gives 0x0 so investigate readartbuf

HTML decoding

• mime.c

Random notes

• artsize = article size

• check whether we’re using an NNTP server: if (datasrc->flags & DF_REMOTE)

• DF_REMOTE = 0x80

• artsize < 0 can only happen when using NNTP server so the code often doesn’t do the bitmask check when artsize < 0 is checked

• artio.c:349 not reached (o, o) through either local or nntp

• break artio.c:457 ← first line inside if (read_something) in readartbuf()

  • local: artbuf_seek=2709, artbuf_pos=0, extra_chars=0, artsize=77292, raw_artsize=77292, artbuf_seek (← tellart()) = 77292
    • artsize becomes 2709
  • nntp: artbuf_seek=2657, artbuf_pos=13, extra_chars=0, artsize=-1
    • after a few c’s content started being displayed even though artsize continues to be -1

.

(gdb) n 1000
Input caption text here. Use the block's Settings tab to change the caption position and set other styles.

Breakpoint 1, qp_decodestring (t=0x6e4f0f "=\n", f=0x6e4f0f "=\n", in_header=0) at mime.c:845
845                     f += 2;
(gdb)
420                                 outpos += i;
(gdb) c
Continuing.
Input caption text hmmmmmmmere. Use the block's Settings tab to change the caption position and set other styles.


** Title of Conservation eNews
------------------------------------------------------------

Breakpoint 1, qp_decodestring (t=0x6e4fdf "=\n", f=0x6e4fdf "=\n", in_header=0) at mime.c:845
845                     f += 2;
(gdb)

• note the “hmmmmmmmere”. i might have stopped it from segfaulting but this is probably the reason it was trying to do a bcopy() with a negative size.