Date:   Mon, 19 Feb 2018 17:58:36 +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 v2 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  | 326 ++++++++++++++++++++++++++++++++++++++++++++++++
 lib/support/json-out.h  |  69 ++++++++++
 misc/dumpe2fs.c         |  17 ++-
 4 files changed, 416 insertions(+), 3 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..8c822f35
--- /dev/null
+++ b/lib/support/json-out.c
@@ -0,0 +1,326 @@
+/*
+ * 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, int ind_lvl);
+static void json_list_node_print_json(struct json_list_node *node, enum json_val_type type, int ind_lvl);
+
+static void
+print_ind(int ind_lvl)
+{
+	int i;
+
+	putchar('\n');
+	for (i = 0; i < ind_lvl; i++)
+	fputs("  ", stdout);
+}
+
+void json_obj_print_json(struct json_obj *obj, int ind_lvl)
+{
+	struct json_pair *pair;
+
+	printf("{");
+	for (pair = obj->pair; pair; pair = pair->next) {
+		json_pair_print_json(pair, ind_lvl+1);
+		if (pair->next)
+			printf(", ");
+	}
+	if (obj->pair) /* Do not indent if object was empty */
+		print_ind(ind_lvl);
+	printf("}");
+}
+
+void json_list_print_json(struct json_list *list, int ind_lvl)
+{
+	struct json_list_node *node;
+
+	printf("[");
+	for (node = list->node; node; node = node->next) {
+		json_list_node_print_json(node, list->type, ind_lvl+1);
+		if (node->next)
+			printf(", ");
+	}
+	if (list->node) /* Do not indent if list was empty */
+		print_ind(ind_lvl);
+	printf("]");
+}
+
+static void
+json_list_node_print_json(struct json_list_node *node, enum json_val_type type, int ind_lvl)
+{
+	print_ind(ind_lvl);
+	switch (type) {
+	case JSON_VAL_STRING:
+		printf("\"%s\"", node->val.str);
+		break;
+	case JSON_VAL_LIST:
+		json_list_print_json(node->val.list, ind_lvl);
+		break;
+	case JSON_VAL_OBJECT:
+		json_obj_print_json(node->val.obj, ind_lvl);
+		break;
+	case JSON_VAL_FLAG:
+		printf("%s", node->val.flag ? "true" : "false");
+		break;
+	default:
+		break;
+	}
+}
+
+static void json_pair_print_json(struct json_pair *pair, int ind_lvl)
+{
+	print_ind(ind_lvl);
+	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, ind_lvl);
+		break;
+	case JSON_VAL_OBJECT:
+		json_obj_print_json(pair->val.obj, ind_lvl);
+		break;
+	default:
+		break;
+	}
+}
diff --git a/lib/support/json-out.h b/lib/support/json-out.h
new file mode 100644
index 00000000..0132bd2c
--- /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, int ind_lvl);
+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, int ind_lvl);
+void json_list_delete(struct json_list *list);
+
+#endif
diff --git a/misc/dumpe2fs.c b/misc/dumpe2fs.c
index 395ea9ee..ca9953a1 100644
--- a/misc/dumpe2fs.c
+++ b/misc/dumpe2fs.c
@@ -607,7 +607,12 @@ try_open_again:
 			goto just_descriptors;
 		list_super (fs->super);
 		if (ext2fs_has_feature_journal_dev(fs->super)) {
-			print_journal_information(fs);
+			print_journal_information(fs, dump_obj);
+			if (json) {
+				json_obj_print_json(dump_obj, 0);
+				putchar('\n');
+				json_obj_delete(dump_obj);
+			}
 			ext2fs_close_free(&fs);
 			exit(0);
 		}
@@ -616,6 +621,11 @@ try_open_again:
 			print_inline_journal_information(fs);
 		list_bad_blocks(fs, 0);
 		if (header_only) {
+			if (json) {
+				json_obj_print_json(dump_obj, 0);
+				putchar('\n');
+				json_obj_delete(dump_obj);
+			}
 			ext2fs_close_free(&fs);
 			exit (0);
 		}
@@ -636,6 +646,11 @@ just_descriptors:
 			       error_message(retval));
 		}
 	}
+	if (json) {
+		json_obj_print_json(dump_obj, 0);
+		putchar('\n');
+		json_obj_delete(dump_obj);
+	}
 	ext2fs_close_free(&fs);
 	remove_error_table(&et_ext2_error_table);
 	exit (0);
-- 
2.14.1

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