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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/56180] Strange behaviour with optimization (using K&R C) Date: Sat, 02 Feb 2013 11:15:00 -0000 [thread overview] Message-ID: <bug-56180-4-VJ6NpRH6Fv@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-56180-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56180 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-02 11:15:22 UTC --- And, even if ungetc works for more than one character (e.g. in glibc it will often work if you are calling ungetc with the characters that fgetc etc. returned from the stream, in reverse order, plus the one guaranteed unrelated ungetc), the /* If we were just checking ahead, unget everything */ while(j) { ungetc(buf[j], parser->file); j--; } loop is calling ungetc first with an uninitialized byte (j is one above the last index stored). There are various other issues in the program.
next prev parent reply other threads:[~2013-02-02 11:15 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-02-02 9:00 [Bug c/56180] New: " paulo_torrens at hotmail dot com 2013-02-02 10:49 ` [Bug c/56180] " jakub at gcc dot gnu.org 2013-02-02 11:15 ` jakub at gcc dot gnu.org [this message] 2013-02-02 21:45 ` paulo_torrens at hotmail dot com 2013-02-03 9:22 ` jakub at gcc dot gnu.org
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