tools: bpftool: introduce --json and --pretty options
These two options can be used to ask for a JSON output (--j or -json),
and to make this JSON human-readable (-p or --pretty).
A json_writer object is created when JSON is required, and will be used
in follow-up commits to produce JSON output.
Note that --pretty implies --json.
Update for the manual pages and interactive help messages comes in a
later patch of the series.
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c
index 613e3c7..14bfc17 100644
--- a/tools/bpf/bpftool/main.c
+++ b/tools/bpf/bpftool/main.c
@@ -51,6 +51,9 @@ const char *bin_name;
static int last_argc;
static char **last_argv;
static int (*last_do_help)(int argc, char **argv);
+json_writer_t *json_wtr;
+bool pretty_output;
+bool json_output;
void usage(void)
{
@@ -217,22 +220,32 @@ static int do_batch(int argc, char **argv)
int main(int argc, char **argv)
{
static const struct option options[] = {
+ { "json", no_argument, NULL, 'j' },
{ "help", no_argument, NULL, 'h' },
+ { "pretty", no_argument, NULL, 'p' },
{ "version", no_argument, NULL, 'V' },
{ 0 }
};
- int opt;
+ int opt, ret;
last_do_help = do_help;
+ pretty_output = false;
+ json_output = false;
bin_name = argv[0];
- while ((opt = getopt_long(argc, argv, "Vh",
+ while ((opt = getopt_long(argc, argv, "Vhpj",
options, NULL)) >= 0) {
switch (opt) {
case 'V':
return do_version(argc, argv);
case 'h':
return do_help(argc, argv);
+ case 'p':
+ pretty_output = true;
+ /* fall through */
+ case 'j':
+ json_output = true;
+ break;
default:
usage();
}
@@ -243,7 +256,21 @@ int main(int argc, char **argv)
if (argc < 0)
usage();
+ if (json_output) {
+ json_wtr = jsonw_new(stdout);
+ if (!json_wtr) {
+ err("failed to create JSON writer\n");
+ return -1;
+ }
+ jsonw_pretty(json_wtr, pretty_output);
+ }
+
bfd_init();
- return cmd_select(cmds, argc, argv, do_help);
+ ret = cmd_select(cmds, argc, argv, do_help);
+
+ if (json_output)
+ jsonw_destroy(&json_wtr);
+
+ return ret;
}