Change tool_print_extra_suppression_use and tool_get_extra_suppression_info
to return the number of characters written to the fixed sized (but dynamically
allocated) buffer supplied as an argument. That way the caller gets a chance
to resize the buffer until large enough.
Change the caller to do exactly that.
Add a comment clarifying the non-standard semantics of VG_(snprintf).


git-svn-id: svn://svn.valgrind.org/valgrind/branches/BUF_REMOVAL@14230 a5019735-40e9-0310-863c-91ae7b9d1cf9