2 files changed, 17 insertions, 9 deletions

diff --git a/plugins/check_users.c b/plugins/check_users.c
index 7cf7a2cc..89b95369 100644
--- a/plugins/check_users.c
+++ b/plugins/check_users.c
@@ -227,18 +227,23 @@ process_arguments (int argc, char **argv)
         }
 
         c = optind;
+
         if (warning_range == NULL && argc > c)
                 warning_range = argv[c++];
+
         if (critical_range == NULL && argc > c)
                 critical_range = argv[c++];
 
         /* this will abort in case of invalid ranges */
         set_thresholds (&thlds, warning_range, critical_range);
 
-        if (thlds->warning->end < 0)
-                usage4 (_("Warning threshold must be a positive integer"));
-        if (thlds->critical->end < 0)
-                usage4 (_("Critical threshold must be a positive integer"));
+        if (!thlds->warning) {
+                usage4 (_("Warning threshold must be a valid range expression"));
+        }
+
+        if (!thlds->critical) {
+                usage4 (_("Critical threshold must be a valid range expression"));
+        }
 
         return OK;
 }
@@ -261,10 +266,10 @@ print_help (void)
         printf (UT_HELP_VRSN);
         printf (UT_EXTRA_OPTS);
 
-        printf (" %s\n", "-w, --warning=INTEGER");
-        printf ("    %s\n", _("Set WARNING status if more than INTEGER users are logged in"));
-        printf (" %s\n", "-c, --critical=INTEGER");
-        printf ("    %s\n", _("Set CRITICAL status if more than INTEGER users are logged in"));
+        printf (" %s\n", "-w, --warning=RANGE_EXPRESSION");
+        printf ("    %s\n", _("Set WARNING status if number of logged in users violates RANGE_EXPRESSION"));
+        printf (" %s\n", "-c, --critical=RANGE_EXPRESSION");
+        printf ("    %s\n", _("Set CRITICAL status if number of logged in users violates RANGE_EXPRESSION"));
 
         printf (UT_SUPPORT);
 }
diff --git a/plugins/t/check_users.t b/plugins/t/check_users.t
index 9ebc2fc6..21c3e53d 100644
--- a/plugins/t/check_users.t
+++ b/plugins/t/check_users.t
@@ -13,10 +13,11 @@ use Test;
 use NPTest;
 
 use vars qw($tests);
-BEGIN {$tests = 8; plan tests => $tests}
+BEGIN {$tests = 12; plan tests => $tests}
 
 my $successOutput = '/^USERS OK - [0-9]+ users currently logged in/';
 my $failureOutput = '/^USERS CRITICAL - [0-9]+ users currently logged in/';
+my $wrongOptionOutput = '/Usage:/';
 
 my $t;
 
@@ -24,6 +25,8 @@ $t += checkCmd( "./check_users 1000 1000", 0, $successOutput );
 $t += checkCmd( "./check_users    0    0", 2, $failureOutput );
 $t += checkCmd( "./check_users -w 0:1000 -c 0:1000", 0, $successOutput );
 $t += checkCmd( "./check_users -w 0:0 -c 0:0", 2, $failureOutput );
+$t += checkCmd( "./check_users -w 0:1000", 3, $wrongOptionOutput);
+$t += checkCmd( "./check_users", 3, $wrongOptionOutput);
 
 exit(0) if defined($Test::Harness::VERSION);
 exit($tests - $t);