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Date: Mon, 10 Jun 2002 19:39:03 +0200 (CEST)
From: Egil Brendsdal <egilb@ife.no>
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Subject: bin/39116: /usr/bin/printf
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>Number:         39116
>Category:       bin
>Synopsis:       /usr/bin/printf
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jun 10 10:40:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Egil Brendsdal
>Release:        FreeBSD 4.4-RELEASE i386
>Organization:
>Environment:
System: FreeBSD malurt.ife.no 4.4-RELEASE FreeBSD 4.4-RELEASE #1: Thu Oct 18 11:11:12 CEST 2001 root@malurt.ife.no:/usr/src/sys/compile/MALURT i386


	
>Description:
	

1) printf fails on \45 and multiple %% in the format string.
2) Field width specified by * gives unpredictable result.


>How-To-Repeat:
	

/usr/bin/printf, 4.4-RELEASE:

  egilb@malurt 101 % ident /usr/bin/printf
  /usr/bin/printf:
       $FreeBSD: src/usr.bin/printf/printf.c,v 1.12.6.4 2001/03/04 08:55:53 kris Exp $

  egilb@malurt 102 % /usr/bin/printf '\45\n'
  printf: illegal format character 

  egilb@malurt 103 % /usr/bin/printf '%%%s\n' a b c
  %a
  printf: illegal format character %

  egilb@malurt 104 % /usr/bin/printf '%*i\n'
  8589934592



Current version of printf from CVS:

  egilb@malurt 101 % ident ./printf
  ./printf:
       $FreeBSD: src/usr.bin/printf/printf.c,v 1.21 2002/04/25 01:10:11 tjr Exp $

  egilb@malurt 102 % ./printf '\45\n'
  printf: illegal format character 

  egilb@malurt 103 % 
  egilb@malurt 103 % ./printf '%%%s\n' a b c
  %a
  printf: illegal format character %

  egilb@malurt 104 % ./printf '%*i\n'
  8589934592


>Fix:

	

The source code of an alternative implementation of printf is available upon request.
Using this program, the result of the reported tests are:
  
  egilb@malurt 101 % my_printf '\45\n'
  %

  egilb@malurt 102 % my_printf '%%%s\n' a b c
  %a
  %b
  %c

  egilb@malurt 103 % my_printf '%*i\n'
  0

In addition, the bug due to internal zero-termination of the
format string is solved:

  egilb@malurt 104 % my_printf '\2\1\0\1\2' | od -c
  0000000  002 001  \0 001 002                                            
  0000005
>Release-Note:
>Audit-Trail:
>Unformatted:

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