On Mon, Oct 01, 2001 at 04:07:13PM -0700, Greg Stein wrote: > On Mon, Oct 01, 2001 at 01:43:55PM -0700, Jon Travis wrote: > > I was thinking today that it would be nice to be able to pre-parse > > *rintf style format strings into an intermediate array. This would > > have the potential to speed up code which uses *rintf by quite a bit. > > Potential vs. demonstrated? > > Can you show that we're spendig significant time parsing the format strings? > Going and throwing a bunch of complexity for a small speedup might not be > worthwhile :-) > > Personally, I'm guessing that more time is spent assembling than parsing.
Since the parsing code is intermingled with the code that throws it into the final buffer, there isn't a good way of profiling this right now. In order to figure out if we are, or not, I'll have to actually write the code to just-parse or just-output the data, which is the end result of my question, anyway. Another useful feature of being able to pre-parse the list would be to have the ability to examine the datatypes required for the format. Why is this terribly useful, you ask? Well, v*printf takes a va_list, which cannot portably be constructed at run-time. However, if we had a special apr_va_list, which we could take as an argument to our special formatter (which also took a preparsed array), we could generate and use v*printf formats/arguments at runtime. -- Jon
