Bug#782228: busybox sh: parameter expansion: string length ${#parameter} is incorrect on multibyte character

[Vincent Lefevre <vincent@vinc17.net>]

Package: busybox
Version: 1:1.22.0-15
Severity: normal

In UTF-8 based locales:

$ busybox sh -c 'a=$(/usr/bin/printf \\u00e9); echo $a ${#a}'
é 2

while POSIX says[*]:

  ${#parameter}
    String Length. The length in characters of the value of parameter
    shall be substituted.

[*] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_02

This the length in *characters*, not in bytes!

So, the output should be "é 1" like with bash, ksh93 and zsh.

-- System Information:
Debian Release: 8.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/8 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages busybox depends on:
ii  libc6  2.19-17

busybox recommends no packages.

busybox suggests no packages.

-- no debconf information

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)