c++ - How to call my_function before every time sprintf is called? -

sprintf api provided platform. want filter format when used. idea is:

#include <stdio.h>  int my_sprintf(...) {     my_filter_function(...);     return ::sprintf(...);   }  #define sprintf my_sprintf

then put these code in pch.

but still worrying can't cover usages, 1 in prebuilt library , not every project has pch. have other idea?

thanks. it's on windows.

you can't "overwrite" built-in function. furthermore, using macro replace name results in program having undefined behaviour.

so, don't try change behaviour of standard library. really, way madness lies.

just call my_sprintf own code , let platform did.

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