ash: [EXPAND] Split unquoted $@/$* correctly when IFS is set but empty

Upstream commit:

    Date: Wed, 8 Oct 2014 15:24:23 +0800
    [EXPAND] Split unquoted $@/$* correctly when IFS is set but empty

    Currently we do not field-split $@/$* when it isn't quoted and IFS
    is set but empty.  This is obviously wrong.  This patch fixes this.

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 46 insertions, 0 deletions

diff --git a/shell/ash_test/ash-vars/var_wordsplit_ifs1.right b/shell/ash_test/ash-vars/var_wordsplit_ifs1.right
new file mode 100644
index 000000000..efdafc70f
--- /dev/null
+++ b/shell/ash_test/ash-vars/var_wordsplit_ifs1.right
@@ -0,0 +1,25 @@
+Testing: !IFS $*
+.abc.
+.d.
+.e.
+Testing: !IFS $@
+.abc.
+.d.
+.e.
+Testing: !IFS "$*"
+.abc d e.
+Testing: !IFS "$@"
+.abc.
+.d e.
+Testing: IFS="" $*
+.abc.
+.d e.
+Testing: IFS="" $@
+.abc.
+.d e.
+Testing: IFS="" "$*"
+.abcd e.
+Testing: IFS="" "$@"
+.abc.
+.d e.
+Finished
diff --git a/shell/ash_test/ash-vars/var_wordsplit_ifs1.tests b/shell/ash_test/ash-vars/var_wordsplit_ifs1.tests
new file mode 100755
index 000000000..532ab992e
--- /dev/null
+++ b/shell/ash_test/ash-vars/var_wordsplit_ifs1.tests
@@ -0,0 +1,21 @@
+set -- abc "d e"
+
+echo 'Testing: !IFS $*'
+unset IFS; for a in $*; do echo ".$a."; done
+echo 'Testing: !IFS $@'
+unset IFS; for a in $@; do echo ".$a."; done
+echo 'Testing: !IFS "$*"'
+unset IFS; for a in "$*"; do echo ".$a."; done
+echo 'Testing: !IFS "$@"'
+unset IFS; for a in "$@"; do echo ".$a."; done
+
+echo 'Testing: IFS="" $*'
+IFS=""; for a in $*; do echo ".$a."; done
+echo 'Testing: IFS="" $@'
+IFS=""; for a in $@; do echo ".$a."; done
+echo 'Testing: IFS="" "$*"'
+IFS=""; for a in "$*"; do echo ".$a."; done
+echo 'Testing: IFS="" "$@"'
+IFS=""; for a in "$@"; do echo ".$a."; done
+
+echo Finished