[Bug bzip2/28283] New: undefined behavior for isdigit and isspace

[roland.illig at gmx dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=28283

            Bug ID: 28283
           Summary: undefined behavior for isdigit and isspace
           Product: bzip2
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bzip2
          Assignee: nobody at sourceware dot org
          Reporter: roland.illig at gmx dot de
                CC: bzip2-devel at sourceware dot org
  Target Milestone: ---

The functions from <ctype.h> take an int as parameter. The value of this
parameter must "either be representable as an unsigned char or be the value of
the macro EOF".

The functions addFlagsFromEnvVar and bzopen_or_bzdopen wrongly cast the
argument to Int32, the correct type is UChar. After a direct cast to Int32, the
argument may still be negative, which makes that cast wrong.

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