CODEWITHSUNDEEP
cfunctionnullparameter-passingreturn-value
CryptoMoogle
CryptoMoogle

Reputation: 3

Efficient way of checking multiple function arguments for NULL in C

I am just wondering is there a more efficient way to check if any argument passed to a function contains a NULL pointer? So far this is what I have been using as an argument check. I want the function to return -1 if any input is NULL.

int Func(const char *one, const char *two){

    if( !one || !two ){
        return -1;
    }

    //rest of the function code
}

This is fine for a function that accepts two arguments; however, it looks messy if I have a function that receives three or more arguments. Is there a better way to do it?

Upvotes: 0

Views: 223

Answers (1)

0___________
0___________

Reputation: 67564

You can write your macros for that. For example for 5 parameters:

#define EVAL(a, ...)!(a) || EVAL1(__VA_ARGS__)
#define EVAL1(a, ...)!(a) || EVAL2(__VA_ARGS__)
#define EVAL2(a, ...)!(a) || EVAL3(__VA_ARGS__)
#define EVAL3(a, ...)!(a) || EVAL4(__VA_ARGS__)
#define EVAL4(a, ...)!(a) 

#define MYASSERT5(...) EVAL(__VA_ARGS__)

int myfunc(const char *p1, const char *p2, const char *p3, const char *p4, const char *p5)
{
    if(MYASSERT5(p1,p2,p3,p4,p5)) return -1;
}

Upvotes: 1

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