[quake3-bugzilla] [Bug 5944] Com_sprintf not working properly

bugzilla-daemon at icculus.org bugzilla-daemon at icculus.org
Fri May 31 03:29:05 EDT 2013


Simon McVittie <smcv-ioquake3 at pseudorandom.co.uk> changed:

           What    |Removed                     |Added
                 CC|                            |smcv-ioquake3 at pseudorandom.
                   |                            |co.uk

--- Comment #2 from Simon McVittie <smcv-ioquake3 at pseudorandom.co.uk> ---
Com_sprintf() is basically ISO C (v)snprintf(), which doesn't allow this usage:

       C99 and POSIX.1-2001 specify that the results are undefined if  a  call
       to  sprintf(), snprintf(), vsprintf(), or vsnprintf() would cause copy‐
       ing to take place between objects that overlap  (e.g.,  if  the  target
       string  array and one of the supplied input arguments refer to the same

If you're writing native code (stuff that ends up in the engine, or
cgame/qagame/ui compiled to native code) then Com_sprintf() is just a wrapper
around (v)snprintf(). If you're writing bytecode (cgame.qvm, qagame.qvm,
ui.qvm), the implementation used is in bg_lib.c.

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