Re: [PATCH 09/13] Allow helpers to report in "list" command that the ref is unchanged

> Hi,
> 
> On Wed, 5 Aug 2009, Daniel Barkalow wrote:
> 
> > +			if (strstr(eon + 1, "unchanged")) {
> 
> I guess we'll want to have a helper like this already:
> 
> 	static int has_attribute(const char *tail, const char *attr) {
> 		int len;
> 
> 		if (!tail)
> 			return 0;
> 
> 		len = strlen(attr);
> 		for (;;) {
> 			const char *space = strchrnul(tail, ' ');
> 			if (len == space - tail && !strncmp(tail, attr, len))
> 				return 1;
> 			if (!*space)
> 				return 0;
> 			tail = space + 1;
> 		}
> 	}
> 
> This guards against attributes that are substrings of other attributes.  
> (You want to future-proof the attributes system, after all, i.e. handle 
> helpers returning attributes unknown to the current Git.)