NSByteCountFormatter corrupts negative counts

Originator:me
Number:rdar://13268309 Date Originated:21-Feb-2013 03:42 PM
Status:Open Resolved:
Product:Mac OS X Product Version:10.8.2 (12C3006)
Classification:Serious Bug Reproducible:Always
 
NSByteCountFormatter's -stringFromByteCount: and +stringFromByteCount:countStyle: methods take a (signed) long long for 'byteCount'. However, passing a negative value instead returns a string for a very large positive number. (Likely the value is being unsafely cast to an unsigned number internally.)

+[NSByteCountFormatter stringFromByteCount:1024 countStyle:NSByteCountFormatterCountStyleMemory]
=> '1 KB'

+[NSByteCountFormatter stringFromByteCount:-1024 countStyle:NSByteCountFormatterCountStyleMemory]
=> '16 EB'

Expected value: '-1 KB'. Or, change the type of the 'byteCount' parameter to unsigned, so the compiler can warn callers if they pass a possibly-negative value.

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