From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Message-id: <515513BE-5416-43D9-8B63-DFABBEF24590@mac.com> From: Pietro Gagliardi To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> In-reply-to: Date: Wed, 4 Feb 2009 22:08:17 -0500 References: <5d375e920902041828p173f0f3etdd5fabd3a65bc330@mail.gmail.com> Subject: Re: [9fans] sed crash Topicbox-Message-UUID: 96041078-ead4-11e9-9d60-3106f5b1d025 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 lp = loc2; loc2 = sp - genbuf + linebuf; while(*sp++ = *lp++) At the point of crash, loc2 is a null pointer when it is assigned to lp, so when the while() statement executes, crash. Now to find out why and when loc2 becomes null. On Feb 4, 2009, at 9:59 PM, Pietro Gagliardi wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On Feb 4, 2009, at 9:28 PM, Uriel wrote: > >> For those that enjoy fixing bugs: >> >> % echo foo | sed >> 's/..a|..b|..c|..d|..e|..f|..g|..h|..i|..j|..k|..l|..m|..n|..o|..p// >> g' >> >> Will crash both native and p9p sed. >> >> Yes, I know it is a nonsensical expression, but it is the simplest >> one >> that still made it crash, I have lost the original version which was >> much more complex. >> >> Note that providing two characters as input will still crash, but if >> the input line is a single character it wont crash. >> >> I have been meaning to get all the fun of tracking this one down >> myself for a while, but seems that I never get to it, so I will let >> others enjoy the fun of fixing it. >> >> Peace >> >> uriel >> > For me, it crashes on the second line of input, in the dosub() > function. Will investigate now. > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.8 (Darwin) > > iEYEARECAAYFAkmKVgoACgkQuv7AVNQDs+x7ZACfYvtxSB5c8TD8LFFjPPHsgtah > 9DwAnjIQ0GM4b82JGPpdJIUYfHjs7+Pv > =7lRk > -----END PGP SIGNATURE----- > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) iEYEARECAAYFAkmKWCEACgkQuv7AVNQDs+xSQQCgoFPwqMsaphtaKBTHHLFryiJr eUMAnA9BjuDpMU40VqJp5hu1EDr3mdXp =XF/E -----END PGP SIGNATURE-----