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-rw-r--r--lib/json_print.c361
1 files changed, 361 insertions, 0 deletions
diff --git a/lib/json_print.c b/lib/json_print.c
new file mode 100644
index 0000000..741acdc
--- /dev/null
+++ b/lib/json_print.c
@@ -0,0 +1,361 @@
+/*
+ * 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 "utils.h"
+#include "json_print.h"
+
+static json_writer_t *_jw;
+
+static void __new_json_obj(int json, bool have_array)
+{
+ if (json) {
+ _jw = jsonw_new(stdout);
+ if (!_jw) {
+ perror("json object");
+ exit(1);
+ }
+ if (pretty)
+ jsonw_pretty(_jw, true);
+ if (have_array)
+ jsonw_start_array(_jw);
+ }
+}
+
+static void __delete_json_obj(bool have_array)
+{
+ if (_jw) {
+ if (have_array)
+ jsonw_end_array(_jw);
+ jsonw_destroy(&_jw);
+ }
+}
+
+void new_json_obj(int json)
+{
+ __new_json_obj(json, true);
+}
+
+void delete_json_obj(void)
+{
+ __delete_json_obj(true);
+}
+
+void new_json_obj_plain(int json)
+{
+ __new_json_obj(json, false);
+}
+
+void delete_json_obj_plain(void)
+{
+ __delete_json_obj(false);
+}
+
+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 as array delimiter in non-json context.
+ */
+void open_json_array(enum output_type type, const char *str)
+{
+ if (_IS_JSON_CONTEXT(type)) {
+ if (str)
+ jsonw_name(_jw, str);
+ jsonw_start_array(_jw);
+ } else if (_IS_FP_CONTEXT(type)) {
+ printf("%s", str);
+ }
+}
+
+/*
+ * End json array or string array
+ */
+void close_json_array(enum output_type type, const char *str)
+{
+ if (_IS_JSON_CONTEXT(type)) {
+ jsonw_end_array(_jw);
+ } else if (_IS_FP_CONTEXT(type)) {
+ printf("%s", str);
+ }
+}
+
+/*
+ * pre-processor directive to generate similar
+ * functions handling different types
+ */
+#define _PRINT_FUNC(type_name, type) \
+ __attribute__((format(printf, 4, 0))) \
+ int print_color_##type_name(enum output_type t, \
+ enum color_attr color, \
+ const char *key, \
+ const char *fmt, \
+ type value) \
+ { \
+ int ret = 0; \
+ 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)) { \
+ ret = color_fprintf(stdout, color, fmt, value); \
+ } \
+ return ret; \
+ }
+_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
+
+#define _PRINT_NAME_VALUE_FUNC(type_name, type, format_char) \
+ void print_##type_name##_name_value(const char *name, type value)\
+ { \
+ SPRINT_BUF(format); \
+ \
+ snprintf(format, SPRINT_BSIZE, \
+ "%s %%"#format_char, name); \
+ print_##type_name(PRINT_ANY, name, format, value); \
+ }
+_PRINT_NAME_VALUE_FUNC(uint, unsigned int, u);
+_PRINT_NAME_VALUE_FUNC(string, const char*, s);
+#undef _PRINT_NAME_VALUE_FUNC
+
+int print_color_string(enum output_type type,
+ enum color_attr color,
+ const char *key,
+ const char *fmt,
+ const char *value)
+{
+ int ret = 0;
+
+ 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)) {
+ ret = color_fprintf(stdout, color, fmt, value);
+ }
+
+ return ret;
+}
+
+/*
+ * 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
+ */
+static int __print_color_bool(enum output_type type,
+ enum color_attr color,
+ const char *key,
+ const char *fmt,
+ bool value,
+ const char *str)
+{
+ int ret = 0;
+
+ if (_IS_JSON_CONTEXT(type)) {
+ if (key)
+ jsonw_bool_field(_jw, key, value);
+ else
+ jsonw_bool(_jw, value);
+ } else if (_IS_FP_CONTEXT(type)) {
+ ret = color_fprintf(stdout, color, fmt, str);
+ }
+
+ return ret;
+}
+
+int print_color_bool(enum output_type type,
+ enum color_attr color,
+ const char *key,
+ const char *fmt,
+ bool value)
+{
+ return __print_color_bool(type, color, key, fmt, value,
+ value ? "true" : "false");
+}
+
+int print_color_on_off(enum output_type type,
+ enum color_attr color,
+ const char *key,
+ const char *fmt,
+ bool value)
+{
+ return __print_color_bool(type, color, key, fmt, value,
+ value ? "on" : "off");
+}
+
+/*
+ * In JSON context uses hardcode %#x format: 42 -> 0x2a
+ */
+int print_color_0xhex(enum output_type type,
+ enum color_attr color,
+ const char *key,
+ const char *fmt,
+ unsigned long long hex)
+{
+ int ret = 0;
+
+ 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)) {
+ ret = color_fprintf(stdout, color, fmt, hex);
+ }
+
+ return ret;
+}
+
+int print_color_hex(enum output_type type,
+ enum color_attr color,
+ const char *key,
+ const char *fmt,
+ unsigned int hex)
+{
+ int ret = 0;
+
+ 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)) {
+ ret = color_fprintf(stdout, color, fmt, hex);
+ }
+
+ return ret;
+}
+
+/*
+ * In JSON context we don't use the argument "value" we simply call jsonw_null
+ * whereas FP context can use "value" to output anything
+ */
+int print_color_null(enum output_type type,
+ enum color_attr color,
+ const char *key,
+ const char *fmt,
+ const char *value)
+{
+ int ret = 0;
+
+ if (_IS_JSON_CONTEXT(type)) {
+ if (key)
+ jsonw_null_field(_jw, key);
+ else
+ jsonw_null(_jw);
+ } else if (_IS_FP_CONTEXT(type)) {
+ ret = color_fprintf(stdout, color, fmt, value);
+ }
+
+ return ret;
+}
+
+/*
+ * This function does take printf style argument but applying
+ * format attribute to causes more warnings since the print_XXX
+ * functions are used with NULL for format if unused.
+ */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wformat-nonliteral"
+int print_color_tv(enum output_type type,
+ enum color_attr color,
+ const char *key,
+ const char *fmt,
+ const struct timeval *tv)
+{
+ double usecs = tv->tv_usec;
+ double secs = tv->tv_sec;
+ double time = secs + usecs / 1000000;
+
+ return print_color_float(type, color, key, fmt, time);
+}
+#pragma GCC diagnostic pop
+
+/* Print line separator (if not in JSON mode) */
+void print_nl(void)
+{
+ if (!_jw)
+ printf("%s", _SL_);
+}
+
+int print_color_rate(bool use_iec, enum output_type type, enum color_attr color,
+ const char *key, const char *fmt, unsigned long long rate)
+{
+ unsigned long kilo = use_iec ? 1024 : 1000;
+ const char *str = use_iec ? "i" : "";
+ static char *units[5] = {"", "K", "M", "G", "T"};
+ char *buf;
+ int rc;
+ int i;
+
+ if (_IS_JSON_CONTEXT(type))
+ return print_color_lluint(type, color, key, "%llu", rate);
+
+ rate <<= 3; /* bytes/sec -> bits/sec */
+
+ for (i = 0; i < ARRAY_SIZE(units) - 1; i++) {
+ if (rate < kilo)
+ break;
+ if (((rate % kilo) != 0) && rate < 1000*kilo)
+ break;
+ rate /= kilo;
+ }
+
+ rc = asprintf(&buf, "%.0f%s%sbit", (double)rate, units[i],
+ i > 0 ? str : "");
+ if (rc < 0)
+ return -1;
+
+ rc = print_color_string(type, color, key, fmt, buf);
+ free(buf);
+ return rc;
+}
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