0001555: ash shell functionality lack - BusyBox Bug and Patch Tracking

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Category

Severity

Reproducibility

Date Submitted

Last Update

0001555

[BusyBox] Standards Compliance

major

always

10-24-07 14:55

02-13-08 07:52

Reporter

alexsv

View Status

public

Assigned To

BusyBox

Priority

normal

Resolution

no change required

Status

closed

Product Version

svn

Summary

0001555: ash shell functionality lack

Description

ash shell from busybox 1.7.2 does not support the following constructions:
CR=$'\r'

for example the following script
----cut----
#!/bin/sh
CR=$'\r'
echo $CR
----cut----
will produce string "$\r" on display
that's violation of standard (citation from man page http://www.gnu.org/software/bash/manual/bashref.html): [^]
==========================
3.1.2.4 ANSI-C Quoting

Words of the form $'string' are treated specially. The word expands to string, with backslash-escaped characters replaced as specified by the ANSI C standard. Backslash escape sequences, if present, are decoded as follows:

\a
    alert (bell)
\b
    backspace
\e
    an escape character (not ANSI C)
\f
    form feed
\n
    newline
\r
    carriage return
\t
    horizontal tab
\v
    vertical tab
\\
    backslash
\'
    single quote
\nnn
    the eight-bit character whose value is the octal value nnn (one to three digits)
\xHH
    the eight-bit character whose value is the hexadecimal value HH (one or two hex digits)
\cx
    a control-x character

The expanded result is single-quoted, as if the dollar sign had not been present.
==========================

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Notes
(0002889) pipatron 11-04-07 17:38	This sounds like a bashism. The relevant documentation for shell standards should be this: http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html [^]

(0004424) vda 02-13-08 07:52	Not a bug. Although I'd be happy to receive a patch which adds this (and other) nice bashisms, with CONFIG_ASH_BASHISMS :)

Issue History
Date Modified	Username	Field	Change
10-24-07 14:55	alexsv	New Issue
10-24-07 14:55	alexsv	Status	new => assigned
10-24-07 14:55	alexsv	Assigned To	=> BusyBox
11-04-07 17:38	pipatron	Note Added: 0002889
02-13-08 07:52	vda	Status	assigned => closed
02-13-08 07:52	vda	Note Added: 0004424
02-13-08 07:52	vda	Resolution	open => no change required