[Bug 1865] New: extend snprintf to work on NULL

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https://freedesktop.org/bugzilla/show_bug.cgi?id=1865        
   
           Summary: extend snprintf to work on NULL
           Product: xorg
           Version: CVS_head
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Lib/other
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: ago at freedesktop.org
OtherBugsDependingO 1802
             nThis:


A lot of platforms have snprintf code which works even if the supplied buffer is
NULL. eg snprintf(NULL, 0, format, ...) will give the size of the formatted string.

The patch adds a few checks for str == NULL to prevent segfaults.        
   
   
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