ash: fix obscure case of replacing + globbing + backslashes

function                                             old     new   delta
subevalvar                                          1152    1178     +26
readtoken1                                          3267    3275      +8
redirect                                            1284    1286      +2
expandarg                                            957     958      +1
expdir                                                 4       -      -4
evalcommand                                         1219    1209     -10
expmeta                                              481     469     -12
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 4/2 up/down: 37/-26)             Total: 11 bytes

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

2 files changed, 31 insertions, 0 deletions

diff --git a/shell/ash_test/ash-quoting/dollar_repl_slash_bash1.right b/shell/ash_test/ash-quoting/dollar_repl_slash_bash1.right
new file mode 100644
index 000000000..b212c246c
--- /dev/null
+++ b/shell/ash_test/ash-quoting/dollar_repl_slash_bash1.right
@@ -0,0 +1,10 @@
+192\.168\.0\.1
+192\.168\.0\.1[
+192\.168\.0\.1[
+192\\.168\\.0\\.1[
+192\.168\.0\.1[
+192\.168\.0\.1
+192\.168\.0\.1[
+192\.168\.0\.1[
+192\\.168\\.0\\.1[
+192\.168\.0\.1[
diff --git a/shell/ash_test/ash-quoting/dollar_repl_slash_bash1.tests b/shell/ash_test/ash-quoting/dollar_repl_slash_bash1.tests
new file mode 100755
index 000000000..3fa2f186d
--- /dev/null
+++ b/shell/ash_test/ash-quoting/dollar_repl_slash_bash1.tests
@@ -0,0 +1,21 @@
+# The bug here was triggered by:
+# * performin pathname expansion because we see [
+# * replace operator did not escape \ in replace string
+
+IP=192.168.0.1
+
+rm -f '192.168.0.1['
+echo "${IP//./\\.}"
+echo "${IP//./\\.}"'[' # bug was here
+echo "${IP//./\\.}["   # bug was here
+echo "${IP//./\\\\.}[" # bug was here
+echo "192\.168\.0\.1["
+
+echo >'192.168.0.1['
+echo "${IP//./\\.}"
+echo "${IP//./\\.}"'[' # bug was here
+echo "${IP//./\\.}["   # bug was here
+echo "${IP//./\\\\.}[" # bug was here
+echo "192\.168\.0\.1["
+
+rm -f '192.168.0.1['