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) 
{
    int i, content=0;  
    for(i = 0; !content && i < size; i++)    
    {  
        content=content | buf(i);       // bitwise or  
    }  
    return (content==0);  
}