[Bug translator/13999] New: pretty-printing shouldn't use %c

["fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13999

             Bug #: 13999
           Summary: pretty-printing shouldn't use %c
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap@sourceware.org
        ReportedBy: fche@redhat.com
    Classification: Unclassified


Further to bug #13998, we shouldn't use %c for pretty-printing plain char types
either, or at least not directly, because the char values may include
non-isgraph() bits.  Consider 

sprintf(".... foo=%c ....", /* ... */ , 0 , /* .... */);

Then %c will insert a \0 into the output stream, and cause loss of all later
fields.  We either need a printf formatting variant that escapes non-isprint()
chars (%C?), or the pretty-printer needs to switch to a non-character output
such as %u.

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