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Date: Mon, 20 Jun 2016 23:39:43 -0700
From: Roopa Prabhu <roopa@...ulusnetworks.com>
To: stephen@...workplumber.org, netdev@...r.kernel.org
Cc: anuradhak@...ulusnetworks.com, nikolay@...ulusnetworks.com,
julien@...ulusnetworks.com
Subject: [PATCH iproute2 net-next v3 1/5] json_writer: allow base json data type to be array or object
From: Anuradha Karuppiah <anuradhak@...ulusnetworks.com>
This patch adds a type qualifier to json_writer. Type can be a
json object or array. This can be extended to other types like
json-string, json-number etc in the future.
Signed-off-by: Anuradha Karuppiah <anuradhak@...ulusnetworks.com>
---
include/json_writer.h | 5 +++--
lib/json_writer.c | 39 +++++++++++++++++++++++++++++++++++----
misc/ifstat.c | 6 +++---
misc/lnstat.c | 2 +-
misc/nstat.c | 4 ++--
5 files changed, 44 insertions(+), 12 deletions(-)
diff --git a/include/json_writer.h b/include/json_writer.h
index ab9a008..e04a40a 100644
--- a/include/json_writer.h
+++ b/include/json_writer.h
@@ -21,8 +21,9 @@
/* Opaque class structure */
typedef struct json_writer json_writer_t;
-/* Create a new JSON stream */
-json_writer_t *jsonw_new(FILE *f);
+/* Create a new JSON stream with data type */
+json_writer_t *jsonw_new_object(FILE *f);
+json_writer_t *jsonw_new_array(FILE *f);
/* End output to JSON stream */
void jsonw_destroy(json_writer_t **self_p);
diff --git a/lib/json_writer.c b/lib/json_writer.c
index 2af16e1..420cd87 100644
--- a/lib/json_writer.c
+++ b/lib/json_writer.c
@@ -22,11 +22,17 @@
#include "json_writer.h"
+enum jsonw_data_type {
+ JSONW_TYPE_OBJECT,
+ JSONW_TYPE_ARRAY
+};
+
struct json_writer {
FILE *out; /* output file */
unsigned depth; /* nesting */
bool pretty; /* optional whitepace */
char sep; /* either nul or comma */
+ int type; /* currently either object or array */
};
/* indentation for pretty print */
@@ -94,7 +100,7 @@ static void jsonw_puts(json_writer_t *self, const char *str)
}
/* Create a new JSON stream */
-json_writer_t *jsonw_new(FILE *f)
+static json_writer_t *jsonw_new(FILE *f, int type)
{
json_writer_t *self = malloc(sizeof(*self));
if (self) {
@@ -102,11 +108,29 @@ json_writer_t *jsonw_new(FILE *f)
self->depth = 0;
self->pretty = false;
self->sep = '\0';
- putc('{', self->out);
+ self->type = type;
+ switch (self->type) {
+ case JSONW_TYPE_OBJECT:
+ putc('{', self->out);
+ break;
+ case JSONW_TYPE_ARRAY:
+ putc('[', self->out);
+ break;
+ }
}
return self;
}
+json_writer_t *jsonw_new_object(FILE *f)
+{
+ return jsonw_new(f, JSONW_TYPE_OBJECT);
+}
+
+json_writer_t *jsonw_new_array(FILE *f)
+{
+ return jsonw_new(f, JSONW_TYPE_ARRAY);
+}
+
/* End output to JSON stream */
void jsonw_destroy(json_writer_t **self_p)
{
@@ -114,7 +138,14 @@ void jsonw_destroy(json_writer_t **self_p)
assert(self->depth == 0);
jsonw_eol(self);
- fputs("}\n", self->out);
+ switch (self->type) {
+ case JSONW_TYPE_OBJECT:
+ fputs("}\n", self->out);
+ break;
+ case JSONW_TYPE_ARRAY:
+ fputs("]\n", self->out);
+ break;
+ }
fflush(self->out);
free(self);
*self_p = NULL;
@@ -267,7 +298,7 @@ void jsonw_null_field(json_writer_t *self, const char *prop)
#ifdef TEST
int main(int argc, char **argv)
{
- json_writer_t *wr = jsonw_new(stdout);
+ json_writer_t *wr = jsonw_new_object(stdout);
jsonw_pretty(wr, true);
jsonw_name(wr, "Vyatta");
diff --git a/misc/ifstat.c b/misc/ifstat.c
index abbb4e7..29aa63c 100644
--- a/misc/ifstat.c
+++ b/misc/ifstat.c
@@ -240,7 +240,7 @@ static void load_raw_table(FILE *fp)
static void dump_raw_db(FILE *fp, int to_hist)
{
- json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
+ json_writer_t *jw = json_output ? jsonw_new_object(fp) : NULL;
struct ifstat_ent *n, *h;
h = hist_db;
@@ -447,7 +447,7 @@ static void print_one_if(FILE *fp, const struct ifstat_ent *n,
static void dump_kern_db(FILE *fp)
{
- json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
+ json_writer_t *jw = json_output ? jsonw_new_object(fp) : NULL;
struct ifstat_ent *n;
if (jw) {
@@ -473,7 +473,7 @@ static void dump_kern_db(FILE *fp)
static void dump_incr_db(FILE *fp)
{
struct ifstat_ent *n, *h;
- json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
+ json_writer_t *jw = json_output ? jsonw_new_object(fp) : NULL;
h = hist_db;
if (jw) {
diff --git a/misc/lnstat.c b/misc/lnstat.c
index 659a01b..2988e9e 100644
--- a/misc/lnstat.c
+++ b/misc/lnstat.c
@@ -110,7 +110,7 @@ static void print_line(FILE *of, const struct lnstat_file *lnstat_files,
static void print_json(FILE *of, const struct lnstat_file *lnstat_files,
const struct field_params *fp)
{
- json_writer_t *jw = jsonw_new(of);
+ json_writer_t *jw = jsonw_new_object(of);
int i;
jsonw_start_object(jw);
diff --git a/misc/nstat.c b/misc/nstat.c
index a9e0f20..7ca6204 100644
--- a/misc/nstat.c
+++ b/misc/nstat.c
@@ -279,7 +279,7 @@ static void load_netstat(void)
static void dump_kern_db(FILE *fp, int to_hist)
{
- json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
+ json_writer_t *jw = json_output ? jsonw_new_object(fp) : NULL;
struct nstat_ent *n, *h;
h = hist_db;
@@ -323,7 +323,7 @@ static void dump_kern_db(FILE *fp, int to_hist)
static void dump_incr_db(FILE *fp)
{
- json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
+ json_writer_t *jw = json_output ? jsonw_new_object(fp) : NULL;
struct nstat_ent *n, *h;
h = hist_db;
--
1.9.1
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