klibc - Mar 2020 - [klibc:update-dash] dash: [EXPAND] Propagate EXP_QPAT in subevalvar

Commit-ID:  a4e6b2aab296a5adc38372b157a854eb82054020
Gitweb:    
http://git.kernel.org/?p=libs/klibc/klibc.git;a=commit;h=a4e6b2aab296a5adc38372b157a854eb82054020
Author:     Herbert Xu <herbert at gondor.apana.org.au>
AuthorDate: Fri, 23 Aug 2013 20:04:12 +1000
Committer:  Ben Hutchings <ben at decadent.org.uk>
CommitDate: Sat, 28 Mar 2020 21:42:54 +0000

[klibc] dash: [EXPAND] Propagate EXP_QPAT in subevalvar

[ dash commit a7c21a6f4cb42d967854cae954efd4ee66bdea9c ]

On Tue, Aug 28, 2012 at 01:27:24PM +0000, Todor Vlaev
wrote:
>
> While playing around with parameter expansion I noticed that the
> following didn't work in dash  (dash 0.5.5.1-7.4ubuntu1) as compared
> to bash even though I believe it should be POSIX-compliant:
>
> my_str=swan; last_char="${my_str#${my_str%?}}"; echo ${last_char}
>
> If the double quotes are removed, the last character is printed correctly.
>
> At a quick glance through the commits after the 0.5.5.1 release I saw
> the following bug fix. Could it be related?
>
> 0d7d66039b614b642c775432fd64aa8c11f9a64d
> [EXPAND] Fix quoted pattern patch breakage
We need to propagate EXP_QPAT in subevalvar as otherwise a nested
parameter expansion within subevalvar may be expanded incorrectly.

Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
Signed-off-by: Ben Hutchings <ben at decadent.org.uk>

---
 usr/dash/expand.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/usr/dash/expand.c b/usr/dash/expand.c
index 355e924e..c4d52606 100644
--- a/usr/dash/expand.c
+++ b/usr/dash/expand.c
@@ -650,7 +650,8 @@ subevalvar(char *p, char *str, int strloc, int subtype, int
startloc, int varfla
 	char *(*scan)(char *, char *, char *, char *, int , int);
 
 	argstr(p, EXP_TILDE | (subtype != VSASSIGN && subtype != VSQUESTION ?
-			       (flag & EXP_QUOTED ? EXP_QPAT : EXP_CASE) : 0));
+			       (flag & (EXP_QUOTED | EXP_QPAT) ?
+			        EXP_QPAT : EXP_CASE) : 0));
 	STPUTC('\0', expdest);
 	argbackq = saveargbackq;
 	startp = stackblock() + startloc;