Robert Kiesling writes: > > David Daney wrote: > > > Robert Kiesling wrote: > > > > I trying to write a function that calls libc functions with > > > > variable arguments - for example, scanf. I would like to do > > > > this by pushing the arguments onto the stack and then calling > > > > the function, something like this. (This code is for an x86 > > > > machine.) > > > > > > > > static long long int scalar_args[512]; > > > > static char *ptr_args[512][BUFSIZE]; > > > > > > Use libffi which ships with GCC. Doing things like this is what it was > > > designed for. > > Libffi clobbers either the arguments or the stream argument (the > first argument before the format string in functions like fprintf > or sprintf). It should make a distinction whether the args or > the stream are writeable or readable, and that, of course is the > idea. I'm a bit mystified by this comment. All arguments are passed by value, and are destroyed after the call. What does libffi do that it should not do? Andrew. -- Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, UK Registered in England and Wales No. 3798903
