[PATCH] test-lib: fix non-portable pattern bracket expressions

["SZEDER Gábor" <szeder.dev@gmail.com>]

Use a '!' character to start a non-matching pattern bracket
expression, as specified by POSIX in Shell Command Language section
2.13.1 Patterns Matching a Single Character [1].

I used '^' instead in three places in the previous three commits, to
verify that the arguments of the '--stress=' and '--stress-limit='
options and the values of various '*_PORT' environment variables are
valid numbers.  With certain shells, at least with dash (upstream and
in Ubuntu 14.04) and mksh, this led to various undesired behaviors:

  # error message in case of a valid number
  $ ~/src/dash/src/dash ./t3903-stash.sh --stress=8
  error: --stress=<N> requires the number of jobs to run

  # not the expected error message
  $ ~/src/dash/src/dash ./t3903-stash.sh --stress=foo
  ./t3903-stash.sh: 238: test: Illegal number: foo

  # no error message at all?!
  $ mksh ./t3903-stash.sh --stress=foo
  $ echo $?
  0

Some other shells, e.g. Bash (even in posix mode), ksh, dash in Ubuntu
16.04 or later, are apparently happy to accept '^' just as well.

[1] http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_13

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
---

Should go on top of 'sg/stress-test'.


 t/test-lib-functions.sh | 2 +-
 t/test-lib.sh           | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 92cf8f812c..969e2ba6da 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -1289,7 +1289,7 @@ test_set_port () {
 			port=$(($port + 10000))
 		fi
 		;;
-	*[^0-9]*|0*)
+	*[!0-9]*|0*)
 		error >&7 "invalid port number: $port"
 		;;
 	*)
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 77eff04c92..4e7cb52b57 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -144,7 +144,7 @@ do
 	--stress=*)
 		stress=${opt#--*=}
 		case "$stress" in
-		*[^0-9]*|0*|"")
+		*[!0-9]*|0*|"")
 			echo "error: --stress=<N> requires the number of jobs to run" >&2
 			exit 1
 			;;
@@ -155,7 +155,7 @@ do
 	--stress-limit=*)
 		stress_limit=${opt#--*=}
 		case "$stress_limit" in
-		*[^0-9]*|0*|"")
+		*[!0-9]*|0*|"")
 			echo "error: --stress-limit=<N> requires the number of repetitions" >&2
 			exit 1
 			;;
-- 
2.21.0.rc0.405.g6226d63c89