Question

I’m curious if this function will determine endianness.

The test is a bitmask that equals 1 if the integer someInt is stored in little endian.

in the bitmask, would 0x1000 be converted to match the endian style of the machine or would it be “constant”?

#include <stdio.h>

int isBigEndian(){
    int someInt =0x0001;
    if(someInt & 0x0100 == 1) 
        return 1;
    else 
        return 0;
}

int main(){
    int returnVal = isBigEndian();
    printf("return val is %d", returnVal);
}

Answer 1

That function will always return zero since your constants are stored in native endianness of the system as well. A much better bet is to just use an system API that answers your question. If you had to be portable, you can probably compare val == ntohl(val) to decide endianness.