Function wrapping macros example

[func_wrap_macro.c]

// gcc -g -Wall -o func_wrap_macro func_wrap_macro.c

#include <stdio.h>

// External function examples.

// Actually, it will be "read", "send" and so on.

static int sample_func1( char c )

{

return( 999 );

}

static void sample_func2( int n )

{

return;

}

// Function wrapping macros.

// Use them in your codes where the external functions are called.

#define FUNC_WRAP(func_param) FUNC_WRAP_##func_param

#define FUNC_WRAP_VOID(func_param) FUNC_WRAP_VOID_##func_param

// Example of function wrapper declarating macros.

// It should be enough with these two.

// You can customize the implementation.

// For example, time-measurement function calls can be added.

#define DECLARE_WRAP( type, func, var, param ) \

type (FUNC_WRAP_##func)var { \

type ret = (func)param; \

printf("%s-%d\n", #func, ret); \

return ret; \

}

#define DECLARE_WRAP_VOID( func, var, param ) \

void (FUNC_WRAP_VOID_##func)var { \

(func)param; \

printf("%s\n", #func); \

return; \

}

// Function wrapper declarations.

// Put them for the number of external functions you will use.

DECLARE_WRAP( int, sample_func1, (char c), (c))

DECLARE_WRAP_VOID( sample_func2, (int n), (n))

// Example of use.

int main()

{

char tmpC = 0;

int tmpN = 1;

int ret = 0;

ret = FUNC_WRAP(sample_func1(tmpC));

FUNC_WRAP_VOID(sample_func2(tmpN));

printf("ret = %d\n", ret);

return( 0 );

}