Faster approach to checking for an all-zero buffer in C?

Question

I am searching for a faster method of accomplishing this:

int is_empty(char * buf, int size) 
{
    int i;
    for(i = 0; i < size; i++) {
        if(buf[         


        

Answer 1

int is_empty(char * buf, int size)
{
   return buf[0] == '\0';
}

If your buffer is not a character string, I think that's the fastest way to check...

memcmp() would require you to create a buffer the same size and then use memset to set it all as 0. I doubt that would be faster...