macosx-10.9.5/CF-855.17/CFString.c

3866     Boolean canBeEightbit = isSepCFString && __CFStrIsEightBit(separatorString);
3885 	// canBeEightbit is already false if the separator is an NSString...
3886         if (CF_IS_OBJC(__kCFStringTypeID, otherString) || ! __CFStrIsEightBit(otherString)) canBeEightbit = false;
3889     buffer = (uint8_t *)CFAllocatorAllocate(alloc, canBeEightbit ? ((numChars + 1) * sizeof(uint8_t)) : (numChars * sizeof(UniChar)), 0);
3892     separatorNumByte = CFStringGetLength(separatorString) * (canBeEightbit ? sizeof(uint8_t) : sizeof(UniChar));
3901                 } else if (canBeEightbit) {
3918             CFIndex otherNumByte = __CFStrLength2(otherString, otherContents) * (canBeEightbit ? sizeof(uint8_t) : sizeof(UniChar));
3920             if (canBeEightbit || __CFStrIsUnicode(otherString)) {
3928     if (canBeEightbit) *bufPtr = 0; // NULL byte;
3930     return canBeEightbit ?