[dpdk-dev] [PATCH] kvargs: return error if key not find in kvlist

[Keith Wiles <keith.wiles@intel.com>]

rte_kvargs_process() should return error if the key
is not found in the kvlist or kvlist is NULL.

Minor documentation changes and update for when an
error is returned.

Signed-off-by: Keith Wiles <keith.wiles@intel.com>
---
 lib/librte_kvargs/rte_kvargs.c | 7 ++++---
 lib/librte_kvargs/rte_kvargs.h | 7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/lib/librte_kvargs/rte_kvargs.c b/lib/librte_kvargs/rte_kvargs.c
index 854ac83f5..c8e8f4b28 100755
--- a/lib/librte_kvargs/rte_kvargs.c
+++ b/lib/librte_kvargs/rte_kvargs.c
@@ -158,16 +158,17 @@ rte_kvargs_process(const struct rte_kvargs *kvlist,
 		void *opaque_arg)
 {
 	const struct rte_kvargs_pair *pair;
-	unsigned i;
+	unsigned int i, found = 0;
 
 	for (i = 0; i < kvlist->count; i++) {
 		pair = &kvlist->pairs[i];
-		if (key_match == NULL || strcmp(pair->key, key_match) == 0) {
+		if (!key_match || strcmp(pair->key, key_match) == 0) {
+			found++;
 			if ((*handler)(pair->key, pair->value, opaque_arg) < 0)
 				return -1;
 		}
 	}
-	return 0;
+	return (!found) ? -1 : 0;
 }
 
 /* free the rte_kvargs structure */
diff --git a/lib/librte_kvargs/rte_kvargs.h b/lib/librte_kvargs/rte_kvargs.h
index 5821c726a..260d4db5b 100755
--- a/lib/librte_kvargs/rte_kvargs.h
+++ b/lib/librte_kvargs/rte_kvargs.h
@@ -115,9 +115,9 @@ void rte_kvargs_free(struct rte_kvargs *kvlist);
  * Call a handler function for each key/value matching the key
  *
  * For each key/value association that matches the given key, calls the
- * handler function with the for a given arg_name passing the value on the
+ * handler function with the given arg_name passing the value in the
  * dictionary for that key and a given extra argument. If *kvlist* is NULL
- * function does nothing.
+ * function does nothing and returns error.
  *
  * @param kvlist
  *   The rte_kvargs structure
@@ -131,7 +131,8 @@ void rte_kvargs_free(struct rte_kvargs *kvlist);
  *
  * @return
  *   - 0 on success
- *   - Negative on error
+ *   - Negative on error or
+ *       if *key_match* does not match an entry in *kvlist*
  */
 int rte_kvargs_process(const struct rte_kvargs *kvlist,
 	const char *key_match, arg_handler_t handler, void *opaque_arg);
-- 
2.11.0