int32_t
CaseInsensitiveCompare(const char16_t *a,
const char16_t *b,
uint32_t len)
{
NS_ASSERTION(a && b, "Do not pass in invalid pointers!");
if (len) {
do {
uint32_t c1 = *a++;
uint32_t c2 = *b++;
// Unfortunately, we need to check for surrogates BEFORE we check
// for equality, because we could have identical high surrogates
// but non-identical characters, so we can't just skip them
// If c1 isn't a surrogate, we don't bother to check c2;
// in the case where it _is_ a surrogate, we're definitely going to get
// a mismatch, and don't need to interpret and lowercase it
if (NS_IS_HIGH_SURROGATE(c1) && len > 1 && NS_IS_LOW_SURROGATE(*a)) {
c1 = SURROGATE_TO_UCS4(c1, *a++);
if (NS_IS_HIGH_SURROGATE(c2) && NS_IS_LOW_SURROGATE(*b)) {
c2 = SURROGATE_TO_UCS4(c2, *b++);
}
// If c2 wasn't a surrogate, decrementing len means we'd stop
// short of the end of string b, but that doesn't actually matter
// because we're going to find a mismatch and return early
--len;
}
if (c1 != c2) {
c1 = ToLowerCase_inline(c1);
c2 = ToLowerCase_inline(c2);
if (c1 != c2) {
if (c1 < c2) {
return -1;
}
return 1;
}
}
} while (--len != 0);
}
return 0;
}
uint32_t
ToLowerCase(uint32_t aChar)
{
return ToLowerCase_inline(aChar);
}
PRUint32
ToLowerCase(PRUint32 aChar)
{
return ToLowerCase_inline(aChar);
}