[Bug bzip2/29280] New: Replace sprintf with safer snprintf

[sean@rogue-research.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29280

            Bug ID: 29280
           Summary: Replace sprintf with safer snprintf
           Product: bzip2
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bzip2
          Assignee: nobody at sourceware dot org
          Reporter: sean@rogue-research.com
                CC: bzip2-devel at sourceware dot org
  Target Milestone: ---

bzip2 has one call to sprintf in git master.

sprintf is dangerous because it's easy to overrun the buffer.  Building on
OpenBSD and macOS produce compiler warnings upon any use of the function.

Would be nice to change this one use to snprintf, which takes the buffer size.

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