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Date: Thu, 2 Nov 1995 11:57:06 +0900
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Subject: bin/809: printf goroup bug [`.' optional precision]
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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: