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How do I make a wrapper function for printf ?

Posted on 2004-08-01
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Last Modified: 2012-06-27
Hi,

I wish to add a wrapper function for printf, to allow multiple debug levels for my program. For example, I could pass it "-v 5" to be very verbose, or "-v 0" to print nothing at all.

The prototype function for printf is:

int printf (const char *format, ...);

How would I make my own function, my_printf, that takes into account the verbosity setting, and calls the real printf?
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Question by:Risky101
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brettmjohnson earned 125 total points
ID: 11688694
To write a wrapper to printf, you will want to us va_list, va_arg, va_start... described here:
http://www.opengroup.org/onlinepubs/009695399/basedefs/stdarg.h.html


However, when faced with the same problem many years ago, I chose to actually
write a wrapper macro rather than function.  This helped performance by avoiding
the function/call return overhead for messages that would be discarded at the
current verbosity level.

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Author Comment

by:Risky101
ID: 11689390
One word: brilliant! Thanks.
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