From f8a486884b8b203a3949d21a2bc309560b201919 Mon Sep 17 00:00:00 2001
From: Jan Schmidt <jan@centricular.com>
Date: Sun, 22 May 2022 00:47:34 +1000
Subject: [PATCH] u/u_json: Implement u_json_get_int_array()

---
 src/xrt/auxiliary/util/u_json.c | 33 +++++++++++++++++++++++++++++++++
 src/xrt/auxiliary/util/u_json.h |  8 ++++++++
 2 files changed, 41 insertions(+)

diff --git a/src/xrt/auxiliary/util/u_json.c b/src/xrt/auxiliary/util/u_json.c
index cb831f07a..e1efa7a6a 100644
--- a/src/xrt/auxiliary/util/u_json.c
+++ b/src/xrt/auxiliary/util/u_json.c
@@ -328,6 +328,39 @@ u_json_get_double_array(const cJSON *json_array, double *out_array, size_t max_s
 	return i;
 }
 
+size_t
+u_json_get_int_array(const cJSON *json_array, int *out_array, size_t max_size)
+{
+	assert(out_array != NULL);
+
+	if (!json_array) {
+		return 0;
+	}
+	if (!cJSON_IsArray(json_array)) {
+		return 0;
+	}
+
+	size_t i = 0;
+	const cJSON *elt;
+	cJSON_ArrayForEach(elt, json_array)
+	{
+		if (i >= max_size) {
+			break;
+		}
+
+		if (!u_json_get_int(elt, &out_array[i])) {
+			U_LOG_W(
+			    "u_json_get_int got a non-number in a "
+			    "numeric array");
+			return i;
+		}
+
+		i++;
+	}
+
+	return i;
+}
+
 bool
 u_json_get_matrix_3x3(const cJSON *json, struct xrt_matrix_3x3 *out_matrix)
 {
diff --git a/src/xrt/auxiliary/util/u_json.h b/src/xrt/auxiliary/util/u_json.h
index 8dc69ab66..bac339854 100644
--- a/src/xrt/auxiliary/util/u_json.h
+++ b/src/xrt/auxiliary/util/u_json.h
@@ -117,6 +117,14 @@ u_json_get_float_array(const cJSON *json_array, float *out_array, size_t max_siz
 size_t
 u_json_get_double_array(const cJSON *json_array, double *out_array, size_t max_size);
 
+/*!
+ * @brief Parse up to max_size int from a JSON array.
+ *
+ * @return the number of elements set.
+ */
+size_t
+u_json_get_int_array(const cJSON *json_array, int *out_array, size_t max_size);
+
 /*!
  * @brief Parse a matrix_3x3 from a JSON object.
  *