It would be nice to have some way to do case-insensitive string comparison on an nsAReadableString. Right now, AFAICT, the only ways to do it are through nsCRT (on char* or PRUnichar*) or through nsString::EqualsIgnoreCase. This means that if one wants to do a case-insensitive comparison of a substring of one nsAReadableString to all of another, one must copy the substring. A good example of where this would be useful is bug 70734.

*** Bug 48853 has been marked as a duplicate of this bug. ***

sr=sfraser

r=mjudge

fix checked in

This was only for the ASCII subset of Unicode I guess?

The fix I checked in allowed clients to specify a comparator, a la Compare(a, b, nsCaseInsensitiveStringComparator()) The specific comparator I mention above uses |nsCRT::strncasecmp| to compare actual hunks, but you can supply your own if you have a more specific desire. |strncasecmp| is the existing behavior for case insensitive comparisons (i.e., what |nsString| supplied before). It's original rickg code. It _looks_ to me like it only works in the iso latin 1 subset (at least that's what the naming leads me to believe); but you are free to provide your own comparator if this isn't sufficient.