On 5/3/12 5:53 AM, Ruediger Kuhlmann wrote:
> Hi,
>
> please try the following bash script:
>
> a=x
> del="$(echo -e "\\x7f")"
>
> echo "$del${a#x}" | od -ta
> echo "$del ${a#x}" | od -ta
> echo " $del${a#x}" | od -ta
>
> Using bash 3.2, the output is:
>
> 0000000 del nl
> 0000002
> 0000000 del sp nl
> 0000003
> 0000000 sp del nl
> 0000003
>
> however with bash 4.1 and bash 4.2.20, the output is only:
>
> 0000000 del nl
> 0000002
> 0000000 sp nl
> 0000002
> 0000000 sp nl
> 0000002
>
> ... so in the second and third line, the delete character magically
> disappears. Neither OS nor locale seem to influence this. Using a delete
> character directly in the script instead of $del also has no impact, either.
It's a case of one part of the code violating assumptions made by (and
conditions imposed by) another. Try the attached patch; it fixes the
issue for me.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU [email protected] http://cnswww.cns.cwru.edu/~chet/
*** ../bash-20120427/subst.c 2012-04-22 16:19:10.000000000 -0400
--- subst.c 2012-05-07 16:06:35.000000000 -0400
***************
*** 8160,8163 ****
--- 8160,8171 ----
dispose_word_desc (tword);
+ /* Kill quoted nulls; we will add them back at the end of
+ expand_word_internal if nothing else in the string */
+ if (had_quoted_null && temp && QUOTED_NULL (temp))
+ {
+ FREE (temp);
+ temp = (char *)NULL;
+ }
+
goto add_string;
break;
***************
*** 8568,8572 ****
if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
tword->flags |= W_QUOTED;
! if (had_quoted_null)
tword->flags |= W_HASQUOTEDNULL;
list = make_word_list (tword, (WORD_LIST *)NULL);
--- 8576,8580 ----
if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
tword->flags |= W_QUOTED;
! if (had_quoted_null && QUOTED_NULL (istring))
tword->flags |= W_HASQUOTEDNULL;
list = make_word_list (tword, (WORD_LIST *)NULL);
***************
*** 8599,8603 ****
if (word->flags & W_NOEXPAND)
tword->flags |= W_NOEXPAND;
! if (had_quoted_null)
tword->flags |= W_HASQUOTEDNULL; /* XXX */
list = make_word_list (tword, (WORD_LIST *)NULL);
--- 8607,8611 ----
if (word->flags & W_NOEXPAND)
tword->flags |= W_NOEXPAND;
! if (had_quoted_null && QUOTED_NULL (istring))
tword->flags |= W_HASQUOTEDNULL; /* XXX */
list = make_word_list (tword, (WORD_LIST *)NULL);
