The fix for this is, unfortunately, to rewrite the whole variable
expansion code, which will however have benefits:
• we can get array trimming working in the same go
• we can fix the issue reported by izabera and confirmed by Geoff and
Chet:
tglase@tglase:~ $ ksh93 -c 'a=~/x; echo ${a#~} ${a#\~}'
~/x /x
tglase@tglase:~ $ mksh -c 'a=~/x; echo ${a#~} ${a#\~}'
/x /x
(this is, tilde expansion is mandated for a couple of expansions' RHS,
like ${x#y} in POSIX and ${x/y} extension which is modelled after it)
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https://bugs.launchpad.net/bugs/1453827
Title:
complex substitutions inside complex substitutions (both using ADELIM)
read past allocated memory
Status in The MirBSD Korn Shell:
Triaged
Bug description:
Reproducer:
valgrind --track-origins=yes --leak-check=no b/mksh -c
'foo=${bar//baz/${sum:1}}'
This seems to be a nesting problem. A closing ADELIM omits the CSUBST,
which also irritates wdscan (which seems flakey anyway), which is what
the substitution uses.
Workaround: use temporary variables.
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