On 1 March 2011 05:11, <richardcavell@xxxxxxxx> wrote: > Hi everyone. I've decided to learn C99, and so I'm passing -std=c99 to gcc. > I've decided to write a Wikipedia bot in C (don't laugh). > > Owing partly to obsessive tendencies and partly due to the need for the bot > to be robust in working unattended at high speed, I want to wrap printf in a > wrapper that automatically detects when printf has failed and tells the > user. The idea is that it is called like this: > > int res = safeprint ( __FILE__ , __LINE__ , "Blah" ) ; > if ( res < 0 ) // uh oh > > But printf has variadic input. I am scratching my head wondering what is > my best option: > > 1. Make safeprint a variadic function (I don't know how to do this) Use va_list, va_start, va_arg and va_end, defined by: #include <stdarg.h> On GNU/Linux you should be able to say "man stdarg.h" to see usage examples. > 2. Turn on C++ and overload safeprint with different combinations of > arguments A better option would be to use a C++ variadic template. > 3. Create multiple safeprint functions with different names, that take > different combinations of arguments That would be inconvenient to use.
