return N<0 ? 0 : *a - *b;
return N<0 ? 0 : UpperToLower[*a] - UpperToLower[*b];
int sqliteStrNICmp(const char *zLeft, const char *zRight, int N){  register unsigned char *a, *b;  a = (unsigned char *)zLeft;  b = (unsigned char *)zRight;  while( N-- > 0 && *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; }  return N<0 ? 0 : *a - *b;}