parameter expansion with uninitialized variable
Christian Hesse
list at eworm.de
Fri Jan 8 20:44:03 UTC 2021
Hello everybody,
with busybox 1.32 shell's parameter expansion starts to fail with
uninitialized variables.
Set a variable and echo, replacing comma with space:
~ $ test=abc,def
~ $ echo ${test/,/ }
abc def
~ $
Even with empty variable this works. Well, brings expected result:
~ $ test=
~ $ echo ${test/,/ }
~ $
But unsetting the variable results in echoing a slash:
~ $ unset test
~ $ echo ${test/,/ }
/
~ $
This worked as expected with busybody 1.31. Sadly bisecting did not reveal
any results as I was facing build errors with most revisions.
--
main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH"
"CX:;",b;for(a/* Best regards my address: */=0;b=c[a++];)
putchar(b-1/(/* Chris cc -ox -xc - && ./x */b/42*2-3)*42);}
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