On Tue, 12 Aug 2014 21:34:33 +0200, wm4 <nfx...@googlemail.com> wrote:
> On Tue, 12 Aug 2014 16:54:50 +0000
> Anton Khirnov <an...@khirnov.net> wrote:
>
> > ---
> > doc/APIchanges | 3 +++
> > libavutil/mem.c | 20 ++++++++++++++++++++
> > libavutil/mem.h | 10 ++++++++++
> > libavutil/version.h | 2 +-
> > 4 files changed, 34 insertions(+), 1 deletion(-)
> >
> > diff --git a/doc/APIchanges b/doc/APIchanges
> > index 6e5242e..fc56677 100644
> > --- a/doc/APIchanges
> > +++ b/doc/APIchanges
> > @@ -13,6 +13,9 @@ libavutil: 2014-08-09
> >
> > API changes, most recent first:
> >
> > +2014-08-xx - xxxxxxx - lavu 54.2.0 - mem.h
> > + Add av_strndup().
> > +
> > 2014-04-xx - xxxxxxx - lavr 2.1.0 - avresample.h
> > Add avresample_convert_frame() and avresample_config().
> >
> > diff --git a/libavutil/mem.c b/libavutil/mem.c
> > index be42342..129aff1 100644
> > --- a/libavutil/mem.c
> > +++ b/libavutil/mem.c
> > @@ -222,6 +222,26 @@ char *av_strdup(const char *s)
> > return ptr;
> > }
> >
> > +char *av_strndup(const char *s, size_t len)
> > +{
> > + size_t len1;
> > + char *ret = NULL;
> > +
> > + if (!s)
> > + return NULL;
> > +
> > + len1 = strlen(s);
> > + len = FFMIN(len, len1);
> > +
> > + ret = av_realloc(NULL, len + 1);
>
> I'm guessing using av_realloc instead of av_malloc avoids wasting space
> by not aligning the allocation?
>
Mainly it makes the string reallocable. It's also what av_strdup does.
--
Anton Khirnov
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