From 45969caad2bbc2f0adb381c77d47e36c6ae5493c Mon Sep 17 00:00:00 2001
From: Olivier Matz <zer0@droids-corp.org>
Date: Thu, 15 Nov 2018 20:21:32 +0100
Subject: [PATCH] introduce ec_config_count

---
 libecoli/ecoli_config.c | 19 +++++++++++++++++++
 libecoli/ecoli_config.h | 10 ++++++++++
 2 files changed, 29 insertions(+)

diff --git a/libecoli/ecoli_config.c b/libecoli/ecoli_config.c
index 0698f07..66d9232 100644
--- a/libecoli/ecoli_config.c
+++ b/libecoli/ecoli_config.c
@@ -360,6 +360,25 @@ ec_config_list(void)
 	return value;
 }
 
+ssize_t ec_config_count(const struct ec_config *config)
+{
+	const struct ec_config *child;
+	ssize_t n;
+
+	switch (config->type) {
+	case EC_CONFIG_TYPE_LIST:
+		n = 0;
+		TAILQ_FOREACH(child, &config->list, next)
+			n++;
+		return n;
+	case EC_CONFIG_TYPE_DICT:
+		// XXX todo
+	default:
+		errno = EINVAL;
+		return -1;
+	}
+}
+
 const struct ec_config_schema *
 ec_config_schema_lookup(const struct ec_config_schema *schema,
 			const char *key)
diff --git a/libecoli/ecoli_config.h b/libecoli/ecoli_config.h
index 9d7c628..6e06a0b 100644
--- a/libecoli/ecoli_config.h
+++ b/libecoli/ecoli_config.h
@@ -265,6 +265,16 @@ int ec_config_list_add(struct ec_config *list, struct ec_config *value);
  */
 int ec_config_list_del(struct ec_config *list, struct ec_config *config);
 
+/**
+ * Count the number of elements in a list or dict.
+ *
+ * @param config
+ *   The configuration that must be a list or a dict.
+ * @return
+ *   The number of elements, or -1 on error (errno is set).
+ */
+ssize_t ec_config_count(const struct ec_config *config);
+
 /**
  * Validate a configuration.
  *
-- 
2.20.1