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- From: Stephen Usher <Stephen.Usher@earth.ox.ac.uk>
- Subject: MiNTlib (I think I'm on pl43): Bug in sprintf().
- Date: Mon, 11 Jul 1994 08:10:13 +0100 (BST)
- Mime-Version: 1.0
-
- Well I've had a fun weekend trying to get the NET/2 BSD version of
- telnet/in.telnetd running and... I've got telnet working.
-
- During this hacking I found a rather nasty feature of sprintf(), though not
- printf(). I've not had a chance to look at the sprintf code at all so I'll
- just describe the "feature."
-
- MiNTlib pl 43 (or is it 44.. I'm losing track of patchlevels these days) and
- GCC 2.3.3, no optimisation.
-
- When a statement such as the following is run sprintf terminates after the
- first argument:-
-
- sprintf((char *)temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TERMTYPE,
- TELOPT_QUAL, term, IAC, SB);
-
- where IAC, SB, TELOPT* are all non-ACSII characters with the top bit
- set, ie. 127 < x < 256. The first two are actually (from memory)
- 0xff and 0xfa.
-
- All you get in temp is the first byte, ie. 0xff. printf() works correctly.
-
- Steve
-
- PS. This is all from memory, so the first SB may not be correct, but the
- value 0xfa is. This, of course, doesn't matter for the bug report as it's to
- do with the telnet protocol.
-
- PPS. in.telnetd isn't working.. well it is, partially, it doesn't echo
- characters and it loses the first character of every packet it sends! I've
- tested telnet by calling my Sun 3/80 and in.telnetd by calling it from the
- Sun.
-
- PPPS. MiNTnet's PPP device works well, except for when there's a data
- overrun when it gets hopelessly confused and has to be restarted (after
- clearing the serial port input buffer using kermit). Kay, could you get your
- slattach to set the baud rate of the serial port using a command line option
- please so I can place the PPP startup in an rc file and not use kermit to
- set the port speed.
-
- --
- ---------------------------------------------------------------------------
- Computer Systems Administrator, Dept. of Earth Sciences, Oxford University.
- E-Mail: steve@uk.ac.ox.earth (JANET) steve@earth.ox.ac.uk (Internet).
- Tel:- Oxford (0865) 282110 (UK) or +44 865 282110 (International).
-