Date: Thu, 2 Nov 1995 11:57:06 +0900 From: kato@eclogite.eps.nagoya-u.ac.jp To: FreeBSD-gnats-submit@freebsd.org Subject: bin/809: printf goroup bug [`.' optional precision] Message-ID: <199511020257.LAA00678@marble.eps.nagoya-u.ac.jp> Resent-Message-ID: <199511020300.TAA08421@freefall.freebsd.org>
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>Number: 809
>Category: bin
>Synopsis: `.' gives the minimum number of (DIGITS+SIGN)
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Wed Nov 1 19:00:01 PST 1995
>Last-Modified:
>Originator: KATO Takenori
>Organization:
Dept. Earth Planet. Sci. Nagoya Univ. Nagoya 464-01, JAPAN
>Release: FreeBSD 2.2-CURRENT i386
>Environment:
All FreeBSD 2.X box
>Description:
The C library functions, printf group may violate ANSI standard.
The optional precision `.' gives the minimun number of not digits but
DIGITS+SIGN. That is, vfprintf routine assumes digit = [0-9] & [+-].
I think `digit' should not include sign flag.
This may be a 4.4BSD-derived bug, because other *BSD box shows same
synopsis (not including NetBSD 1.1).
This affect many of programs, which assume digit consists of [0-9].
One of the examples is libI77.
>How-To-Repeat:
The C code,
#include <stdio.h>
void main(void)
{
printf("%.2d\n", 1);
printf("%+.2d\n", 1);
printf("%+.3d\n", 1);
}
gives following result:
01
+1
+01
On the contrary, NEWS, Sun, OSF/1 and Borland C++ 3.1 give following:
01
+01
+001
>Fix:
not known. (maybe bug stays in /usr/src/lib/libc/stdio/vfprintf.c?)
>Audit-Trail:
>Unformatted:
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