[FFmpeg-devel] [PATCH] Replace all %t print prefixes with macros

Michael Niedermayer michaelni at gmx.at
Tue Aug 21 23:26:25 CEST 2012

On Tue, Aug 21, 2012 at 09:31:10AM +0200, Nicolas George wrote:
> Le quintidi 5 fructidor, an CCXX, jamal a écrit :
> > Some C libraries don't support the %t lenght specifier, resulting in print functions
> > outputting said string literally and ignoring the argument
> Can you be a little bit more specific in placing the blame?
> > -    av_log(NULL, AV_LOG_DEBUG, "subtitle_packet size=%td\n", q - outbuf);
> > +    av_log(NULL, AV_LOG_DEBUG, "subtitle_packet size=%" PRIdPTR "\n", q - outbuf);
> Note that %td is for ptrdiff_t while PRIdPTR is for intptr_t; there is no
> guarantee that they are the same type. In segmented architectures, I guess
> ptrdiff_t would be the size of a near pointer while intptr_t would be the
> size of a far pointer.
> It probably does not change anything on supported architectures, though, but
> I am not completely sure about that.

is there a better identifer in C99 than PRIdPTR for ptrdiff_t ?


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Avoid a single point of failure, be that a person or equipment.
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