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Hi, Is there anybody with alpha assembler knowledge going to fix sysdeps/alpha/memchr.S ? Andreas
- Subject: libc/1116: Bug in Alpha version of memchr() in glibc
- From: spc@armigeron.com
- Date: Sun May 16 17:25:10 1999
Topics: libc/1116: Bug in Alpha version of memchr() in glibc ---------------------------------------------------------------------- Date: Mon, 10 May 1999 16:07:46 -0400 From: spc@armigeron.com To: bugs@gnu.org Subject: libc/1116: Bug in Alpha version of memchr() in glibc Message-Id: <199905102007.QAA17810@armigeron.com> >Number: 1116 >Category: libc >Synopsis: If size is > $7fffffffffffffff, memchr() fails >Confidential: no >Severity: non-critical >Priority: medium >Responsible: libc-gnats >State: open >Class: sw-bug >Submitter-Id: unknown >Arrival-Date: Mon May 10 16:20:01 EDT 1999 >Last-Modified: >Originator: Sean 'Captain Napalm' Conner >Organization: Armigeron Information Services, Inc. >Release: libc-2.0.7 >Environment: DEC Alpha, Linux 2.0.x, RedHat 5.2 distribution Host type: @host@ System: Linux wopr.armigeron.com 2.0.36 #2 Fri Feb 26 16:17:31 EST 1999 i586 unknown Architecture: i586 Addons: @subdirs@ Build CFLAGS: @CFLAGS@ Build CC: @CC@ Build shared: @shared@ Build profile: @profile@ Build omitfp: @omitfp@ Stdio: @stdio@ >Description: (see code below): Myself and a friend have tracked the problem down to the call to memchr(). If the high bit of SSIZET_MAX is stripped off, the function works correctly. We concluded that this is not the correct behavior, and the code works fine on two other platforms (Intel and MIPS, also running RedHat with glibc). >How-To-Repeat: The following code produces the incorrect output on a DEC Alpha running RedHat Linux 5.2 using glibc 2.0.7. #include <string.h> #include <stdlib.h> #include <stdio.h> #define SSIZET_MAX (~(size_t)0) int main(void) { char *p, *q; printf("SSIZET_MAX = %lx\n", (unsigned long )SSIZET_MAX); p = memchr(q = "Date: Something I never seem to have.", 0, SSIZET_MAX) printf("p = %p, p' = %p\n", p, q); return (0); } [spc]tempest:/home/spc>./a.out SSIZET_MAX = ffffffffffffffff p = (nil), p' = 0x120000808 >Fix: >Audit-Trail: >Unformatted: ------------------------------ End of forward-cAlXT Digest ***************************
-- Andreas Jaeger aj@arthur.rhein-neckar.de jaeger@informatik.uni-kl.de for pgp-key finger ajaeger@aixd1.rhrk.uni-kl.de
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