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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");
}
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