[cfe-dev] Extending printf format string checking to cover ObjC format strings in NSLog

Nikita Zhuk nikita at zhuk.fi
Mon Jun 16 13:13:58 PDT 2008

On 16.6.2008, at 21.38, Ted Kremenek wrote:

> This functionality should eventually go in as well.  The set of such  
> CF functions should be small.  Other functions that use Objective-C  
> style format strings should generally be labeled with the  
> __NSString__ attribute.  Unfortunately, it looks like the  
> "initWithFormat:" methods do not have this attribute:
> Fortunately, it looks like the set of methods to hardwire support  
> for is small.

I wasn't aware of format(__NSString__) attribute, but it would clearly  
be beneficial to recognize format NSStrings based on it.

Actually the NSLog() function seems to be the only function or method  
in AppKit & Foundation headers which uses this attribute. I've found  
several functions and methods which use format NSStrings and don't use  
the format(__NSString__) attribute: 12 functions in AppKit/NSPanel.h,  
4 functions in CoreFoundation/CFString.h, 4 methods in Foundation/ 
NSException.h and 8 methods in Foundation/NSString.h.
So hardcoding both function and method names seems inevitable.

- Nikita

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