1 files changed, 158 insertions, 0 deletions
diff --git a/src/spdk/dpdk/lib/librte_telemetry/telemetry_json.h b/src/spdk/dpdk/lib/librte_telemetry/telemetry_json.h
new file mode 100644
index 000000000..a2ce4899e
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_telemetry/telemetry_json.h
@@ -0,0 +1,158 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2020 Intel Corporation
+ */
+
+#ifndef _RTE_TELEMETRY_JSON_H_
+#define _RTE_TELEMETRY_JSON_H_
+
+#include <inttypes.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <rte_common.h>
+
+/**
+ * @file
+ * Internal Telemetry Utility functions
+ *
+ * This file contains small inline functions to make it easier for applications
+ * to build up valid JSON responses to telemetry requests.
+ *
+ ***/
+
+/**
+ * @internal
+ * Copies a value into a buffer if the buffer has enough available space.
+ * Nothing written to buffer if an overflow ocurs.
+ * This function is not for use for values larger than 1k.
+ */
+__rte_format_printf(3, 4)
+static inline int
+__json_snprintf(char *buf, const int len, const char *format, ...)
+{
+	char tmp[1024];
+	va_list ap;
+	int ret;
+
+	va_start(ap, format);
+	ret = vsnprintf(tmp, sizeof(tmp), format, ap);
+	va_end(ap);
+	if (ret > 0 && ret < (int)sizeof(tmp) && ret < len) {
+		strcpy(buf, tmp);
+		return ret;
+	}
+	return 0; /* nothing written or modified */
+}
+
+/* Copies an empty array into the provided buffer. */
+static inline int
+rte_tel_json_empty_array(char *buf, const int len, const int used)
+{
+	return used + __json_snprintf(buf + used, len - used, "[]");
+}
+
+/* Copies an empty object into the provided buffer. */
+static inline int
+rte_tel_json_empty_obj(char *buf, const int len, const int used)
+{
+	return used + __json_snprintf(buf + used, len - used, "{}");
+}
+
+/* Copies a string into the provided buffer, in JSON format. */
+static inline int
+rte_tel_json_str(char *buf, const int len, const int used, const char *str)
+{
+	return used + __json_snprintf(buf + used, len - used, "\"%s\"", str);
+}
+
+/* Appends a string into the JSON array in the provided buffer. */
+static inline int
+rte_tel_json_add_array_string(char *buf, const int len, const int used,
+		const char *str)
+{
+	int ret, end = used - 1; /* strip off final delimiter */
+	if (used <= 2) /* assume empty, since minimum is '[]' */
+		return __json_snprintf(buf, len, "[\"%s\"]", str);
+
+	ret = __json_snprintf(buf + end, len - end, ",\"%s\"]", str);
+	return ret == 0 ? used : end + ret;
+}
+
+/* Appends an integer into the JSON array in the provided buffer. */
+static inline int
+rte_tel_json_add_array_int(char *buf, const int len, const int used, int val)
+{
+	int ret, end = used - 1; /* strip off final delimiter */
+	if (used <= 2) /* assume empty, since minimum is '[]' */
+		return __json_snprintf(buf, len, "[%d]", val);
+
+	ret = __json_snprintf(buf + end, len - end, ",%d]", val);
+	return ret == 0 ? used : end + ret;
+}
+
+/* Appends a uint64_t into the JSON array in the provided buffer. */
+static inline int
+rte_tel_json_add_array_u64(char *buf, const int len, const int used,
+		uint64_t val)
+{
+	int ret, end = used - 1; /* strip off final delimiter */
+	if (used <= 2) /* assume empty, since minimum is '[]' */
+		return __json_snprintf(buf, len, "[%"PRIu64"]", val);
+
+	ret = __json_snprintf(buf + end, len - end, ",%"PRIu64"]", val);
+	return ret == 0 ? used : end + ret;
+}
+
+/**
+ * Add a new element with uint64_t value to the JSON object stored in the
+ * provided buffer.
+ */
+static inline int
+rte_tel_json_add_obj_u64(char *buf, const int len, const int used,
+		const char *name, uint64_t val)
+{
+	int ret, end = used - 1;
+	if (used <= 2) /* assume empty, since minimum is '{}' */
+		return __json_snprintf(buf, len, "{\"%s\":%"PRIu64"}", name,
+				val);
+
+	ret = __json_snprintf(buf + end, len - end, ",\"%s\":%"PRIu64"}",
+			name, val);
+	return ret == 0 ? used : end + ret;
+}
+
+/**
+ * Add a new element with int value to the JSON object stored in the
+ * provided buffer.
+ */
+static inline int
+rte_tel_json_add_obj_int(char *buf, const int len, const int used,
+		const char *name, int val)
+{
+	int ret, end = used - 1;
+	if (used <= 2) /* assume empty, since minimum is '{}' */
+		return __json_snprintf(buf, len, "{\"%s\":%d}", name,
+				val);
+
+	ret = __json_snprintf(buf + end, len - end, ",\"%s\":%d}",
+			name, val);
+	return ret == 0 ? used : end + ret;
+}
+
+/**
+ * Add a new element with string value to the JSON object stored in the
+ * provided buffer.
+ */
+static inline int
+rte_tel_json_add_obj_str(char *buf, const int len, const int used,
+		const char *name, const char *val)
+{
+	int ret, end = used - 1;
+	if (used <= 2) /* assume empty, since minimum is '{}' */
+		return __json_snprintf(buf, len, "{\"%s\":\"%s\"}", name, val);
+
+	ret = __json_snprintf(buf + end, len - end, ",\"%s\":\"%s\"}",
+			name, val);
+	return ret == 0 ? used : end + ret;
+}
+
+#endif /*_RTE_TELEMETRY_JSON_H_*/