ash: remove arithmetic expansion collapsing at parse time
Collapsing arithmetic expansion is incorrect when the inner arithmetic
expansion is a part of a parameter expansion.
Test case:
unset a
echo $((3 + ${a:=$((4 + 5))}))
echo $a
Old result:
12
(4 + 5)
New result:
12
9
Based on commit bb777a6 from git://git.kernel.org/pub/scm/utils/dash/dash.git
by Herbert Xu
function old new delta
readtoken1 3180 3163 -17
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/ash_test/ash-vars/var-do-not-collapse-arithmetic-expansion-at-parse-time.right b/shell/ash_test/ash-vars/var-do-not-collapse-arithmetic-expansion-at-parse-time.right
new file mode 100644
index 0000000..81a1585
--- /dev/null
+++ b/shell/ash_test/ash-vars/var-do-not-collapse-arithmetic-expansion-at-parse-time.right
@@ -0,0 +1,2 @@
+12
+9
diff --git a/shell/ash_test/ash-vars/var-do-not-collapse-arithmetic-expansion-at-parse-time.tests b/shell/ash_test/ash-vars/var-do-not-collapse-arithmetic-expansion-at-parse-time.tests
new file mode 100755
index 0000000..e97a08a
--- /dev/null
+++ b/shell/ash_test/ash-vars/var-do-not-collapse-arithmetic-expansion-at-parse-time.tests
@@ -0,0 +1,3 @@
+unset a
+echo $((3 + ${a:=$((4 + 5))}))
+echo $a