command-line: Add function to print all options.

This commit adds a function that prints (both long and short)
options of a ovs-* command.  To use this function, option
'--option' is added to ovs-appctl/dpctl/ofctl and ovsdb-tool
commands.  A future patch will use the option output to
conduct bash command-line completion.

Signed-off-by: Alex Wang <alexw@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/utilities/ovs-appctl.c b/utilities/ovs-appctl.c
index bb17ec27f..3d32cbd61 100644
--- a/utilities/ovs-appctl.c
+++ b/utilities/ovs-appctl.c
@@ -110,12 +110,14 @@ static const char *
 parse_command_line(int argc, char *argv[])
 {
     enum {
+        OPT_START = UCHAR_MAX + 1,
         VLOG_OPTION_ENUMS
     };
     static const struct option long_options[] = {
         {"target", required_argument, NULL, 't'},
         {"execute", no_argument, NULL, 'e'},
         {"help", no_argument, NULL, 'h'},
+        {"option", no_argument, NULL, 'o'},
         {"version", no_argument, NULL, 'V'},
         {"timeout", required_argument, NULL, 'T'},
         VLOG_LONG_OPTIONS,
@@ -157,6 +159,10 @@ parse_command_line(int argc, char *argv[])
             usage();
             break;
 
+        case 'o':
+            print_options(long_options);
+            exit(EXIT_SUCCESS);
+
         case 'T':
             time_alarm(atoi(optarg));
             break;