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ash: fix handling of ${VAR: -2}

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2016-07-25 03:56:00 +02:00
parent 0fb0045aa9
commit f8ddbe1ccc
3 changed files with 25 additions and 4 deletions
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11
shell/ash_test/ash-vars/var_bash1a.tests Executable file
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@ -0,0 +1,11 @@
parameter=abcdef
offset=2
noffset=-2
echo "parameter '${parameter}'"
echo "varoffset2 '${parameter:${offset}}'"
echo "varoffset-2 '${parameter:${noffset}}'"
echo "literal '2' '${parameter:2}'"
# This is not inrpreted as ${VAR:POS{:LEN}},
# but as ${VAR:=WORD} - if VAR is unset or null, substitute WORD
echo "literal '-2' '${parameter:-2}'"
echo "literal ' -2' '${parameter: -2}'"