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read -a not generating zero length elements correctly


From: Neal H. Walfield
Subject: read -a not generating zero length elements correctly
Date: Wed, 10 Mar 2004 15:09:47 -0500
User-agent: Wanderlust/2.8.1 (Something) SEMI/1.14.3 (Ushinoya) FLIM/1.14.3 (Unebigoryƍmae) APEL/10.3 Emacs/21.2 (i386-debian-linux-gnu) MULE/5.0 (SAKAKI)

Configuration Information [Automatically generated, do not change]:
Machine: i386
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i386' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i386-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DSHELL -DHAVE_CONFIG_H  -I.  -I../bash -I../bash/include 
-I../bash/lib  -g -O2
uname output: Linux moore 2.4.22-1-686 #6 Sat Oct 4 14:09:08 EST 2003 i686 
GNU/Linux
Machine Type: i386-pc-linux-gnu

Bash Version: 2.05b
Patch Level: 0
Release Status: release

Description:

        Using read -a with IFS=: and empty strings yields unexpected
        array contents.

Repeat-By:
        #! /bin/bash
        
        IFS=: read -a A <<EOF
        :::
        EOF
        echo ${#A[@]}
        echo \"${A[0]}\"
        if test -z "${A[0]}"
        then
            echo FOO
        else
            echo BAR
        fi
        
        if test -z "$(echo -n \"${A[0]}\" | cat)"
        then
            echo FOO
        else
            echo BAR
        fi
        
        echo -n ${A[0]} | cat -vet
        echo -n ${A[0]} | wc
        
        Sample output:

        $ bash ~/foo.sh
        3
        ""
        BAR
        BAR
        ^?      0       0       1
        $

Fix:
        Unknown.  I have not yet looked at the bash code.




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