76 lines
1.6 KiB
Diff
76 lines
1.6 KiB
Diff
From: Felix Fietkau <nbd@openwrt.org>
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Date: Fri, 17 Apr 2015 01:54:51 +0200
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Subject: [PATCH] ash: fix a regression in handling local variables
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commit 109ee5d33694a03cda3424b4846584250832ba8e
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"ash: make "locak VAR" unset VAR (bash does that)"
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This commit introduced a regression where calling local on an already
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local variable unsets it. This does not match bash behavior.
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Update test case to check for this behavior
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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---
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--- a/shell/ash.c
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+++ b/shell/ash.c
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@@ -8961,6 +8961,21 @@ parse_command_args(char **argv, const ch
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}
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#endif
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+static bool
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+findlocal(struct var *vp)
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+{
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+ struct localvar *lvp = localvars;
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+
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+ while (lvp) {
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+ if (lvp->vp == vp)
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+ return true;
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+
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+ lvp = lvp->next;
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+ }
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+
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+ return false;
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+}
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+
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/*
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* Make a variable a local variable. When a variable is made local, it's
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* value and flags are saved in a localvar structure. The saved values
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@@ -9000,7 +9015,7 @@ mklocal(char *name)
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vp->flags |= VSTRFIXED|VTEXTFIXED;
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if (eq)
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setvareq(name, 0);
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- else
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+ else if (!findlocal(vp))
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/* "local VAR" unsets VAR: */
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setvar(name, NULL, 0);
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}
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--- a/shell/ash_test/ash-misc/local1.right
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+++ b/shell/ash_test/ash-misc/local1.right
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@@ -1,4 +1,5 @@
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A1:'A'
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A2:''
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-A3:''
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-A4:'A'
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+A3:'B'
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+A4:''
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+A5:'A'
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--- a/shell/ash_test/ash-misc/local1.tests
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+++ b/shell/ash_test/ash-misc/local1.tests
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@@ -3,9 +3,12 @@ f() {
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local a
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# the above line unsets $a
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echo "A2:'$a'"
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- unset a
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+ a=B
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+ local a
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echo "A3:'$a'"
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+ unset a
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+ echo "A4:'$a'"
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}
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echo "A1:'$a'"
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f
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-echo "A4:'$a'"
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+echo "A5:'$a'"
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