+ const unsigned char* s1 = (const unsigned char*)_s1;
+ const unsigned char* s2 = (const unsigned char*)_s2;
+ while( n-- && *s1 && *s2 )
+ {
+ if( *s1 != *s2 )
+ {
+ int rv;
+ rv = toupper(*s1) - toupper(*s2);
+ if(rv != 0)
+ return rv;
+ rv = tolower(*s1) - tolower(*s2);
+ if(rv != 0)
+ return rv;
+ }
+ s1 ++;
+ s2 ++;