[FFmpeg-devel] [PATCH 2/4] Make strmatch() return 1 only if the string compared against the prefix does not contain other characters which may belong to an identifier.

[Stefano Sabatini]

On date Sunday 2010-10-31 11:28:02 +0100, Michael Niedermayer encoded:
> On Sun, Oct 31, 2010 at 01:30:56AM +0200, Stefano Sabatini wrote:
> > This allows to distinguish for example to have different constants
> > with the same prefix (e.g. "foo" and "foobar").
> > ---
> >  libavutil/eval.c |    4 +++-
> >  1 files changed, 3 insertions(+), 1 deletions(-)
> > 
> > diff --git a/libavutil/eval.c b/libavutil/eval.c
> > index 6e03498..27c1b6d 100644
> > --- a/libavutil/eval.c
> > +++ b/libavutil/eval.c
> > @@ -103,13 +103,15 @@ double av_strtod(const char *numstr, char **tail)
> >      return d;
> >  }
> >  
> > +#define IDENTIFIER_CHARS "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_0123456789"
> > +
> >  static int strmatch(const char *s, const char *prefix)
> >  {
> >      int i;
> >      for (i=0; prefix[i]; i++) {
> >          if (prefix[i] != s[i]) return 0;
> >      }
> > -    return 1;
> > +    return !strspn(s+i, IDENTIFIER_CHARS);
> 
> check the char ranges directly please, this is just slow

Updated.
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