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Date: Mon, 19 Feb 2018 12:54:43 +0300
From: Viktor Prutyanov <viktor.prutyanov@...tuozzo.com>
To: linux-ext4@...r.kernel.org
Cc: Theodore Ts'o <tytso@....edu>,
Dmitry Monakhov <dmonakhov@...nvz.org>,
Viktor Prutyanov <viktor.prutyanov@...tuozzo.com>
Subject: [PATCH 1/5] libsupport: add JSON output helpers
This patch adds JSON objects and lists and methods to print them
Signed-off-by: Viktor Prutyanov <viktor.prutyanov@...tuozzo.com>
---
lib/support/Makefile.in | 7 +-
lib/support/json-out.c | 300 ++++++++++++++++++++++++++++++++++++++++++++++++
lib/support/json-out.h | 69 +++++++++++
3 files changed, 374 insertions(+), 2 deletions(-)
create mode 100644 lib/support/json-out.c
create mode 100644 lib/support/json-out.h
diff --git a/lib/support/Makefile.in b/lib/support/Makefile.in
index 40206b74..42fa3324 100644
--- a/lib/support/Makefile.in
+++ b/lib/support/Makefile.in
@@ -22,7 +22,8 @@ OBJS= cstring.o \
quotaio.o \
quotaio_v2.o \
quotaio_tree.o \
- dict.o
+ dict.o \
+ json-out.o
SRCS= $(srcdir)/argv_parse.c \
$(srcdir)/cstring.c \
@@ -35,7 +36,8 @@ SRCS= $(srcdir)/argv_parse.c \
$(srcdir)/quotaio.c \
$(srcdir)/quotaio_tree.c \
$(srcdir)/quotaio_v2.c \
- $(srcdir)/dict.c
+ $(srcdir)/dict.c \
+ $(srcdir)/json-out.c
LIBRARY= libsupport
LIBDIR= support
@@ -165,3 +167,4 @@ quotaio_v2.o: $(srcdir)/quotaio_v2.c $(top_builddir)/lib/config.h \
$(srcdir)/dqblk_v2.h $(srcdir)/quotaio_tree.h
dict.o: $(srcdir)/dict.c $(top_builddir)/lib/config.h \
$(top_builddir)/lib/dirpaths.h $(srcdir)/dict.h
+json-out.o: $(srcdir)/json-out.c $(srcdir)/json-out.h
diff --git a/lib/support/json-out.c b/lib/support/json-out.c
new file mode 100644
index 00000000..a87fe92e
--- /dev/null
+++ b/lib/support/json-out.c
@@ -0,0 +1,300 @@
+/*
+ * json-out.c -- JSON output
+ *
+ * Copyright (c) 2018 Virtuozzo International GmbH
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+#include "json-out.h"
+
+static void *xmalloc(size_t size)
+{
+ void *p = malloc(size);
+
+ if (!p)
+ exit(1);
+
+ return p;
+}
+
+static void *xstrdup(const char *str)
+{
+ size_t size = strlen(str) + 1;
+ char *p = xmalloc(size);
+
+ return strcpy(p, str);
+}
+
+struct json_list *json_list_create(enum json_val_type type)
+{
+ struct json_list *list = xmalloc(sizeof(struct json_list));
+
+ list->node = NULL;
+ list->type = type;
+
+ return list;
+}
+
+struct json_list *json_list_create_in_obj(struct json_obj *parent_obj, char *key, enum json_val_type type)
+{
+ struct json_list *list = json_list_create(type);
+
+ json_obj_add_list(parent_obj, key, list);
+
+ return list;
+}
+
+void json_list_delete(struct json_list *list)
+{
+ struct json_list_node *node = list->node, *next;
+
+ while (node) {
+ switch (list->type) {
+ case JSON_VAL_STRING:
+ free(node->val.str);
+ break;
+ case JSON_VAL_LIST:
+ json_list_delete(node->val.list);
+ break;
+ case JSON_VAL_OBJECT:
+ json_obj_delete(node->val.obj);
+ break;
+ default:
+ break;
+ }
+ next = node->next;
+ free(node);
+ node = next;
+ }
+ free(list);
+}
+
+struct json_obj *json_obj_create(void)
+{
+ struct json_obj *obj = xmalloc(sizeof(struct json_obj));
+
+ obj->pair = NULL;
+
+ return obj;
+}
+
+struct json_obj *json_obj_create_in_obj(struct json_obj *parent_obj, char *key)
+{
+ struct json_obj *obj = json_obj_create();
+
+ json_obj_add_obj(parent_obj, key, obj);
+
+ return obj;
+}
+
+static void json_pair_delete(struct json_pair *pair)
+{
+ switch (pair->type)
+ {
+ case JSON_VAL_STRING:
+ free(pair->val.str);
+ break;
+ case JSON_VAL_LIST:
+ json_list_delete(pair->val.list);
+ break;
+ case JSON_VAL_OBJECT:
+ json_obj_delete(pair->val.obj);
+ break;
+ default:
+ break;
+ }
+ free(pair->key);
+ free(pair);
+}
+
+void json_obj_delete(struct json_obj *obj)
+{
+ struct json_pair *pair = obj->pair, *next;
+
+ while (pair) {
+ next = pair->next;
+ json_pair_delete(pair);
+ pair = next;
+ }
+ free(obj);
+}
+
+void json_obj_delete_pair(struct json_obj *obj, char *key)
+{
+ struct json_pair *pair = obj->pair, *next, *prev = NULL;
+
+ while (pair) {
+ next = pair->next;
+ if (!strcmp(pair->key, key)) {
+ json_pair_delete(pair);
+ if (prev)
+ prev->next = next;
+ else
+ obj->pair = next;
+ break;
+ }
+ prev = pair;
+ pair = next;
+ }
+}
+
+static struct json_list_node *json_list_add_node(struct json_list *list)
+{
+ struct json_list_node *new_node = xmalloc(sizeof(struct json_list_node));
+
+ new_node->next = NULL;
+
+ if (list->node) {
+ struct json_list_node *node;
+
+ for (node = list->node; node && node->next; node = node->next);
+ node->next = new_node;
+ } else
+ list->node = new_node;
+
+ return new_node;
+}
+
+void json_list_add_str(struct json_list *list, const char *str)
+{
+ struct json_list_node *new_node = json_list_add_node(list);
+
+ new_node->val.str = xstrdup(str);
+}
+
+void json_list_add_obj(struct json_list *list, struct json_obj *obj)
+{
+ struct json_list_node *new_node = json_list_add_node(list);
+
+ new_node->val.obj = obj;
+}
+
+static struct json_pair *json_obj_add_pair(struct json_obj *obj, const char *key, enum json_val_type type)
+{
+ struct json_pair *new_pair = xmalloc(sizeof(struct json_pair));
+ new_pair->key = xstrdup(key);
+ new_pair->next = NULL;
+ new_pair->type = type;
+
+ if (obj->pair) {
+ struct json_pair *pair;
+
+ for (pair = obj->pair; pair && pair->next; pair = pair->next);
+ pair->next = new_pair;
+ } else
+ obj->pair = new_pair;
+
+ return new_pair;
+}
+
+void json_obj_add_str(struct json_obj *obj, const char *key, const char *str)
+{
+ struct json_pair *new_pair = json_obj_add_pair(obj, key, JSON_VAL_STRING);
+
+ new_pair->val.str = xstrdup(str);
+}
+
+void json_obj_add_fmt_buf_str(struct json_obj *obj, const char *key, char *buf, size_t size, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ vsnprintf(buf, size, fmt, ap);
+ va_end(ap);
+
+ json_obj_add_str(obj, key, buf);
+}
+
+void json_obj_add_fmt_str(struct json_obj *obj, const char *key, size_t size, const char *fmt, ...)
+{
+ va_list ap;
+ char *buf = malloc(size);
+
+ va_start(ap, fmt);
+ vsnprintf(buf, size, fmt, ap);
+ va_end(ap);
+
+ json_obj_add_str(obj, key, buf);
+ free(buf);
+}
+
+void json_obj_add_list(struct json_obj *obj, const char *key, struct json_list *list)
+{
+ struct json_pair *new_pair = json_obj_add_pair(obj, key, JSON_VAL_LIST);
+
+ new_pair->val.list = list;
+}
+
+void json_obj_add_obj(struct json_obj *obj, const char *key, struct json_obj *new_obj)
+{
+ struct json_pair *new_pair = json_obj_add_pair(obj, key, JSON_VAL_OBJECT);
+
+ new_pair->val.obj = new_obj;
+}
+
+static void json_pair_print_json(struct json_pair *pair);
+
+void json_obj_print_json(struct json_obj *obj)
+{
+ struct json_pair *pair;
+
+ printf("{");
+ for (pair = obj->pair; pair; pair = pair->next) {
+ json_pair_print_json(pair);
+ if (pair->next)
+ printf(", ");
+ }
+ printf("}");
+}
+
+void json_list_print_json(struct json_list *list)
+{
+ struct json_list_node *node;
+
+ printf("[");
+ for (node = list->node; node; node = node->next) {
+ switch (list->type) {
+ case JSON_VAL_STRING:
+ printf("\"%s\"", node->val.str);
+ break;
+ case JSON_VAL_LIST:
+ json_list_print_json(node->val.list);
+ break;
+ case JSON_VAL_OBJECT:
+ json_obj_print_json(node->val.obj);
+ break;
+ default:
+ break;
+ }
+ if (node->next)
+ printf(", ");
+ }
+ printf("]");
+}
+
+static void json_pair_print_json(struct json_pair *pair)
+{
+ printf("\"%s\": ", pair->key);
+ switch (pair->type) {
+ case JSON_VAL_STRING:
+ printf("\"%s\"", pair->val.str);
+ break;
+ case JSON_VAL_LIST:
+ json_list_print_json(pair->val.list);
+ break;
+ case JSON_VAL_OBJECT:
+ json_obj_print_json(pair->val.obj);
+ break;
+ default:
+ break;
+ }
+}
diff --git a/lib/support/json-out.h b/lib/support/json-out.h
new file mode 100644
index 00000000..ec9cab7c
--- /dev/null
+++ b/lib/support/json-out.h
@@ -0,0 +1,69 @@
+/*
+ * json-out.h -- JSON output
+ *
+ * Copyright (c) 2018 Virtuozzo International GmbH
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+#ifndef H_JSON_OUT
+#define H_JSON_OUT
+
+enum json_val_type {
+ JSON_VAL_STRING,
+ JSON_VAL_OBJECT,
+ JSON_VAL_LIST,
+ JSON_VAL_FLAG
+};
+
+struct json_obj {
+ struct json_pair *pair;
+};
+
+union json_val {
+ char *str;
+ struct json_obj *obj;
+ struct json_list *list;
+ char flag;
+};
+
+struct json_pair {
+ char *key;
+ enum json_val_type type;
+ union json_val val;
+ struct json_pair *next;
+};
+
+struct json_list {
+ enum json_val_type type;
+ struct json_list_node *node;
+};
+
+struct json_list_node {
+ union json_val val;
+ struct json_list_node *next;
+};
+
+struct json_obj *json_obj_create(void);
+struct json_obj *json_obj_create_in_obj(struct json_obj *parent_obj, char *key);
+void json_obj_add_str(struct json_obj *obj, const char *key, const char *str);
+void json_obj_add_list(struct json_obj *obj, const char *key, struct json_list *list);
+void json_obj_add_obj(struct json_obj *obj, const char *key, struct json_obj *new_obj);
+void json_obj_add_flag(struct json_obj *obj, const char *key, char flag);
+void json_obj_add_fmt_str(struct json_obj *obj, const char *key, size_t size, const char *fmt, ...);
+void json_obj_add_fmt_buf_str(struct json_obj *obj, const char *key, char *buf, size_t size, const char *fmt, ...);
+void json_obj_print_json(struct json_obj *obj);
+void json_obj_delete_pair(struct json_obj *obj, char *key);
+void json_obj_delete(struct json_obj *obj);
+
+struct json_list *json_list_create(enum json_val_type type);
+struct json_list *json_list_create_in_obj(struct json_obj *parent_obj, char *key, enum json_val_type type);
+void json_list_add_str(struct json_list *list, const char *str);
+void json_list_add_obj(struct json_list *list, struct json_obj *obj);
+void json_list_print_json(struct json_list *list);
+void json_list_delete(struct json_list *list);
+
+#endif
--
2.14.1
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