[patch iproute2-next 3/6] devlink: implement command line args dry parsing

[Jiri Pirko <jiri@resnulli.us>]

From: Jiri Pirko <jiri@nvidia.com>

In preparation to the follow-up dump selector patch, introduce function
dl_argv_dry_parse() which allows to do dry parsing of command line
arguments without printing out any error messages to the user.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 devlink/devlink.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index e7b5b788863a..8d2424f58cc2 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -64,6 +64,7 @@
 static int g_new_line_count;
 static int g_indent_level;
 static bool g_indent_newline;
+static bool g_err_suspended;
 
 #define INDENT_STR_STEP 2
 #define INDENT_STR_MAXLEN 32
@@ -74,6 +75,8 @@ pr_err(const char *fmt, ...)
 {
 	va_list ap;
 
+	if (g_err_suspended)
+		return;
 	va_start(ap, fmt);
 	vfprintf(stderr, fmt, ap);
 	va_end(ap);
@@ -2284,6 +2287,21 @@ static int dl_argv_parse(struct dl *dl, uint64_t o_required,
 	return dl_args_finding_required_validate(o_required, o_found);
 }
 
+static int dl_argv_dry_parse(struct dl *dl, uint64_t o_required,
+			     uint64_t o_optional)
+{
+	char **argv = dl->argv;
+	int argc = dl->argc;
+	int err;
+
+	g_err_suspended = true;
+	err = dl_argv_parse(dl, o_required, o_optional);
+	g_err_suspended = false;
+	dl->argv = argv;
+	dl->argc = argc;
+	return err;
+}
+
 static void
 dl_function_attr_put(struct nlmsghdr *nlh, const struct dl_opts *opts)
 {
-- 
2.41.0