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-rw-r--r--json_print.c228
1 files changed, 228 insertions, 0 deletions
diff --git a/json_print.c b/json_print.c
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index 0000000..4f62767
--- /dev/null
+++ b/json_print.c
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+/*
+ * json_print.c "print regular or json output, based on json_writer".
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Authors: Julien Fortin, <julien@cumulusnetworks.com>
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "json_print.h"
+
+#define SPRINT_BSIZE 64
+#define SPRINT_BUF(x) char x[SPRINT_BSIZE]
+
+static json_writer_t *_jw;
+
+#define _IS_JSON_CONTEXT(type) ((type & PRINT_JSON || type & PRINT_ANY) && _jw)
+#define _IS_FP_CONTEXT(type) (!_jw && (type & PRINT_FP || type & PRINT_ANY))
+
+void new_json_obj(int json)
+{
+ if (json) {
+ _jw = jsonw_new(stdout);
+ if (!_jw) {
+ perror("json object");
+ exit(1);
+ }
+ jsonw_pretty(_jw, true);
+ jsonw_start_array(_jw);
+ }
+}
+
+void delete_json_obj(void)
+{
+ if (_jw) {
+ jsonw_end_array(_jw);
+ jsonw_destroy(&_jw);
+ }
+}
+
+bool is_json_context(void)
+{
+ return _jw != NULL;
+}
+
+json_writer_t *get_json_writer(void)
+{
+ return _jw;
+}
+
+void open_json_object(const char *str)
+{
+ if (_IS_JSON_CONTEXT(PRINT_JSON)) {
+ if (str)
+ jsonw_name(_jw, str);
+ jsonw_start_object(_jw);
+ }
+}
+
+void close_json_object(void)
+{
+ if (_IS_JSON_CONTEXT(PRINT_JSON))
+ jsonw_end_object(_jw);
+}
+
+/*
+ * Start json array or string array using
+ * the provided string as json key (if not null)
+ * or array delimiter in non-json context.
+ */
+void open_json_array(const char *key, const char *str)
+{
+ if (is_json_context()) {
+ if (key)
+ jsonw_name(_jw, key);
+ jsonw_start_array(_jw);
+ } else {
+ printf("%s", str);
+ }
+}
+
+/*
+ * End json array or string array
+ */
+void close_json_array(const char *delim)
+{
+ if (is_json_context())
+ jsonw_end_array(_jw);
+ else
+ printf("%s", delim);
+}
+
+/*
+ * pre-processor directive to generate similar
+ * functions handling different types
+ */
+#define _PRINT_FUNC(type_name, type) \
+ __attribute__((format(printf, 3, 0))) \
+ void print_##type_name(enum output_type t, \
+ const char *key, \
+ const char *fmt, \
+ type value) \
+ { \
+ if (_IS_JSON_CONTEXT(t)) { \
+ if (!key) \
+ jsonw_##type_name(_jw, value); \
+ else \
+ jsonw_##type_name##_field(_jw, key, value); \
+ } else if (_IS_FP_CONTEXT(t)) { \
+ fprintf(stdout, fmt, value); \
+ } \
+ }
+_PRINT_FUNC(int, int);
+_PRINT_FUNC(s64, int64_t);
+_PRINT_FUNC(hhu, unsigned char);
+_PRINT_FUNC(hu, unsigned short);
+_PRINT_FUNC(uint, unsigned int);
+_PRINT_FUNC(u64, uint64_t);
+_PRINT_FUNC(luint, unsigned long);
+_PRINT_FUNC(lluint, unsigned long long);
+_PRINT_FUNC(float, double);
+#undef _PRINT_FUNC
+
+void print_string(enum output_type type,
+ const char *key,
+ const char *fmt,
+ const char *value)
+{
+ if (_IS_JSON_CONTEXT(type)) {
+ if (key && !value)
+ jsonw_name(_jw, key);
+ else if (!key && value)
+ jsonw_string(_jw, value);
+ else
+ jsonw_string_field(_jw, key, value);
+ } else if (_IS_FP_CONTEXT(type)) {
+ fprintf(stdout, fmt, value);
+ }
+}
+
+/*
+ * value's type is bool. When using this function in FP context you can't pass
+ * a value to it, you will need to use "is_json_context()" to have different
+ * branch for json and regular output. grep -r "print_bool" for example
+ */
+void print_bool(enum output_type type,
+ const char *key,
+ const char *fmt,
+ bool value)
+{
+ if (_IS_JSON_CONTEXT(type)) {
+ if (key)
+ jsonw_bool_field(_jw, key, value);
+ else
+ jsonw_bool(_jw, value);
+ } else if (_IS_FP_CONTEXT(type)) {
+ fprintf(stdout, fmt, value ? "true" : "false");
+ }
+}
+
+/*
+ * In JSON context uses hardcode %#x format: 42 -> 0x2a
+ */
+void print_0xhex(enum output_type type,
+ const char *key,
+ const char *fmt,
+ unsigned long long hex)
+{
+ if (_IS_JSON_CONTEXT(type)) {
+ SPRINT_BUF(b1);
+
+ snprintf(b1, sizeof(b1), "%#llx", hex);
+ print_string(PRINT_JSON, key, NULL, b1);
+ } else if (_IS_FP_CONTEXT(type)) {
+ fprintf(stdout, fmt, hex);
+ }
+}
+
+void print_hex(enum output_type type,
+ const char *key,
+ const char *fmt,
+ unsigned int hex)
+{
+ if (_IS_JSON_CONTEXT(type)) {
+ SPRINT_BUF(b1);
+
+ snprintf(b1, sizeof(b1), "%x", hex);
+ if (key)
+ jsonw_string_field(_jw, key, b1);
+ else
+ jsonw_string(_jw, b1);
+ } else if (_IS_FP_CONTEXT(type)) {
+ fprintf(stdout, fmt, hex);
+ }
+}
+
+/*
+ * In JSON context we don't use the argument "value" we simply call jsonw_null
+ * whereas FP context can use "value" to output anything
+ */
+void print_null(enum output_type type,
+ const char *key,
+ const char *fmt,
+ const char *value)
+{
+ if (_IS_JSON_CONTEXT(type)) {
+ if (key)
+ jsonw_null_field(_jw, key);
+ else
+ jsonw_null(_jw);
+ } else if (_IS_FP_CONTEXT(type)) {
+ fprintf(stdout, fmt, value);
+ }
+}
+
+/* Print line separator (if not in JSON mode) */
+void print_nl(void)
+{
+ if (!_jw)
+ printf("%s", "\n");
+}