Author: jilles
Date: Sat Oct 24 21:20:04 2009
New Revision: 198454
URL: http://svn.freebsd.org/changeset/base/198454
Log:
sh: Exempt $@ and $* from set -u
This seems more useful and will likely be in the next POSIX standard.
Also document more precisely in the man page what set -u does (note that
$@, $* and $! are the only special parameters that can ever be unset, all
the others are always set, although they may be empty).
Added:
head/tools/regression/bin/sh/expansion/set-u2.0 (contents, props changed)
Modified:
head/bin/sh/expand.c
head/bin/sh/sh.1
Modified: head/bin/sh/expand.c
==============================================================================
--- head/bin/sh/expand.c Sat Oct 24 20:57:11 2009 (r198453)
+++ head/bin/sh/expand.c Sat Oct 24 21:20:04 2009 (r198454)
@@ -657,7 +657,7 @@ again: /* jump here after setting a vari
}
varlen = 0;
startloc = expdest - stackblock();
- if (!set && uflag) {
+ if (!set && uflag && *var != '@' && *var != '*') {
switch (subtype) {
case VSNORMAL:
case VSTRIMLEFT:
Modified: head/bin/sh/sh.1
==============================================================================
--- head/bin/sh/sh.1 Sat Oct 24 20:57:11 2009 (r198453)
+++ head/bin/sh/sh.1 Sat Oct 24 21:20:04 2009 (r198454)
@@ -32,7 +32,7 @@
.\" from: @(#)sh.1 8.6 (Berkeley) 5/4/95
.\" $FreeBSD$
.\"
-.Dd May 31, 2009
+.Dd October 24, 2009
.Dt SH 1
.Os
.Sh NAME
@@ -296,7 +296,10 @@ sh -T -c "trap 'exit 1' 2 ; some-blockin
.Ed
.It Fl u Li nounset
Write a message to standard error when attempting
-to expand a variable that is not set, and if the
+to expand a variable, a positional parameter or
+the special parameter
+.Va \&!
+that is not set, and if the
shell is not interactive, exit immediately.
.It Fl V Li vi
Enable the built-in
Added: head/tools/regression/bin/sh/expansion/set-u2.0
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/tools/regression/bin/sh/expansion/set-u2.0 Sat Oct 24 21:20:04
2009 (r198454)
@@ -0,0 +1,12 @@
+# $FreeBSD$
+
+set -u
+: $* $@ "$@" "$*"
+set -- x
+: $* $@ "$@" "$*"
+shift $#
+: $* $@ "$@" "$*"
+set -- y
+set --
+: $* $@ "$@" "$*"
+exit 0
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