/*
* $Id: json_object.c,v 1.17 2006/07/25 03:24:50 mclark Exp $
*
* Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
* Michael Clark <michael@metaparadigm.com>
* Copyright (c) 2009 Hewlett-Packard Development Company, L.P.
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See COPYING for details.
*
*/
#include "config.h"
#include "strerror_override.h"
#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <math.h>
#include "debug.h"
#include "printbuf.h"
#include "linkhash.h"
#include "arraylist.h"
#include "json_inttypes.h"
#include "json_object.h"
#include "json_object_private.h"
#include "json_util.h"
#include "math_compat.h"
#include "strdup_compat.h"
#include "snprintf_compat.h"
#if SIZEOF_LONG_LONG != SIZEOF_INT64_T
#error "The long long type isn't 64-bits"
#endif
// Don't define this. It's not thread-safe.
/* #define REFCOUNT_DEBUG 1 */
const char *json_number_chars = "0123456789.+-eE";
const char *json_hex_chars = "0123456789abcdefABCDEF";
static void json_object_generic_delete(struct json_object* jso);
static struct json_object* json_object_new(enum json_type o_type);
static json_object_to_json_string_fn json_object_object_to_json_string;
static json_object_to_json_string_fn json_object_boolean_to_json_string;
static json_object_to_json_string_fn json_object_double_to_json_string_default;
static json_object_to_json_string_fn json_object_int_to_json_string;
static json_object_to_json_string_fn json_object_string_to_json_string;
static json_object_to_json_string_fn json_object_array_to_json_string;
/* ref count debugging */
#ifdef REFCOUNT_DEBUG
static struct lh_table *json_object_table;
static void json_object_init(void) __attribute__ ((constructor));
static void json_object_init(void) {
MC_DEBUG("json_object_init: creating object table\n");
json_object_table = lh_kptr_table_new(128, NULL);
}
static void json_object_fini(void) __attribute__ ((destructor));
static void json_object_fini(void)
{
struct lh_entry *ent;
if (MC_GET_DEBUG())
{
if (json_object_table->count)
{
MC_DEBUG("json_object_fini: %d referenced objects at exit\n",
json_object_table->count);
lh_foreach(json_object_table, ent)
{
struct json_object* obj =
(struct json_object*) lh_entry_v(ent);
MC_DEBUG("\t%s:%p\n",
json_type_to_name(obj->o_type), obj);
}
}
}
MC_DEBUG("json_object_fini: freeing object table\n");
lh_table_free(json_object_table);
}
#endif /* REFCOUNT_DEBUG */
/* helper for accessing the optimized string data component in json_object
*/
static const char *
get_string_component(const struct json_object *jso)
{
return (jso->o.c_string.len < LEN_DIRECT_STRING_DATA) ?
jso->o.c_string.str.data : jso->o.c_string.str.ptr;
}
/* string escaping */
static int json_escape_str(struct printbuf *pb, const char *str, int len, int flags)
{
int pos = 0, start_offset = 0;
unsigned char c;
while (len--)
{
c = str[pos];
switch(c)
{
case '\b':
case '\n':
case '\r':
case '\t':
case '\f':
case '"':
case '\\':
case '/':
if((flags & JSON_C_TO_STRING_NOSLASHESCAPE) && c == '/')
{
pos++;
break;
}
if(pos - start_offset > 0)
printbuf_memappend(pb, str + start_offset, pos - start_offset);
if(c == '\b') printbuf_memappend(pb, "\\b", 2);
else if(c == '\n') printbuf_memappend(pb, "\\n", 2);
else if(c == '\r') printbuf_memappend(pb, "\\r", 2);
else if(c == '\t') printbuf_memappend(pb, "\\t", 2);
else if(c == '\f') printbuf_memappend(pb, "\\f", 2);
else if(c == '"') printbuf_memappend(pb, "\\\"", 2);
else if(c == '\\') printbuf_memappend(pb, "\\\\", 2);
else if(c == '/') printbuf_memappend(pb, "\\/", 2);
start_offset = ++pos;
break;
default:
if(c < ' ')
{
char sbuf[7];
if(pos - start_offset > 0)
printbuf_memappend(pb,
str + start_offset,
pos - start_offset);
snprintf(sbuf, sizeof(sbuf),
"\\u00%c%c",
json_hex_chars[c >> 4],
json_hex_chars[c & 0xf]);
printbuf_memappend_fast(pb, sbuf, (int) sizeof(sbuf) - 1);
start_offset = ++pos;
} else
pos++;
}
}
if (pos - start_offset > 0)
printbuf_memappend(pb, str + start_offset, pos - start_offset);
return 0;
}
/* reference counting */
extern struct json_object* json_object_get(struct json_object *jso)
{
if (!jso) return jso;
#if defined(HAVE_ATOMIC_BUILTINS) && defined(ENABLE_THREADING)
__sync_add_and_fetch(&jso->_ref_count, 1);
#else
++jso->_ref_count;
#endif
return jso;
}
int json_object_put(struct json_object *jso)
{
if(!jso) return 0;
/* Avoid invalid free and crash explicitly instead of (silently)
* segfaulting.
*/
assert(jso->_ref_count > 0);
#if defined(HAVE_ATOMIC_BUILTINS) && defined(ENABLE_THREADING)
/* Note: this only allow the refcount to remain correct
* when multiple threads are adjusting it. It is still an error
* for a thread to decrement the refcount if it doesn't "own" it,
* as that can result in the thread that loses the race to 0
* operating on an already-freed object.
*/
if (__sync_sub_and_fetch(&jso->_ref_count, 1) > 0) return 0;
#else
if (--jso->_ref_count > 0) return 0;
#endif
if (jso->_user_delete)
jso->_user_delete(jso, jso->_userdata);
jso->_delete(jso);
return 1;
}
/* generic object construction and destruction parts */
static void json_object_generic_delete(struct json_object* jso)
{
#ifdef REFCOUNT_DEBUG
MC_DEBUG("json_object_delete_%s: %p\n",
json_type_to_name(jso->o_type), jso);
lh_table_delete(json_object_table, jso);
#endif /* REFCOUNT_DEBUG */
printbuf_free(jso->_pb);
free(jso);
}
static struct json_object* json_object_new(enum json_type o_type)
{
struct json_object *jso;
jso = (struct json_object*)calloc(sizeof(struct json_object), 1);
if (!jso)
return NULL;
jso->o_type = o_type;
jso->_ref_count = 1;
jso->_delete = &json_object_generic_delete;
#ifdef REFCOUNT_DEBUG
lh_table_insert(json_object_table, jso, jso);
MC_DEBUG("json_object_new_%s: %p\n", json_type_to_name(jso->o_type), jso);
#endif /* REFCOUNT_DEBUG */
return jso;
}
/* type checking functions */
int json_object_is_type(const struct json_object *jso, enum json_type type)
{
if (!jso)
return (type == json_type_null);
return (jso->o_type == type);
}
enum json_type json_object_get_type(const struct json_object *jso)
{
if (!jso)
return json_type_null;
return jso->o_type;
}
void* json_object_get_userdata(json_object *jso) {
return jso ? jso->_userdata : NULL;
}
void json_object_set_userdata(json_object *jso, void *userdata,
json_object_delete_fn *user_delete)
{
// Can't return failure, so abort if we can't perform the operation.
assert(jso != NULL);
// First, clean up any previously existing user info
if (jso->_user_delete)
jso->_user_delete(jso, jso->_userdata);
jso->_userdata = userdata;
jso->_user_delete = user_delete;
}
/* set a custom conversion to string */
void json_object_set_serializer(json_object *jso,
json_object_to_json_string_fn *to_string_func,
void *userdata,
json_object_delete_fn *user_delete)
{
json_object_set_userdata(jso, userdata, user_delete);
if (to_string_func == NULL)
{
// Reset to the standard serialization function
switch(jso->o_type)
{
case json_type_null:
jso->_to_json_string = NULL;
break;
case json_type_boolean:
jso->_to_json_string = &json_object_boolean_to_json_string;
break;
case json_type_double:
jso->_to_json_string = &json_object_double_to_json_string_default;
break;
case json_type_int:
jso->_to_json_string = &json_object_int_to_json_string;
break;
case json_type_object:
jso->_to_json_string = &json_object_object_to_json_string;
break;
case json_type_array:
jso->_to_json_string = &json_object_array_to_json_string;
break;
case json_type_string:
jso->_to_json_string = &json_object_string_to_json_string;
break;
}
return;
}
jso->_to_json_string = to_string_func;
}
/* extended conversion to string */
const char* json_object_to_json_string_length(struct json_object *jso, int flags, size_t *length)
{
const char *r = NULL;
size_t s = 0;
if (!jso)
{
s = 4;
r = "null";
}
else if ((jso->_pb) || (jso->_pb = printbuf_new()))
{
printbuf_reset(jso->_pb);
if(jso->_to_json_string(jso, jso->_pb, 0, flags) >= 0)
{
s = (size_t)jso->_pb->bpos;
r = jso->_pb->buf;
}
}
if (length)
*length = s;
return r;
}
const char* json_object_to_json_string_ext(struct json_object *jso, int flags)
{
return json_object_to_json_string_length(jso, flags, NULL);
}
/* backwards-compatible conversion to string */
const char* json_object_to_json_string(struct json_object *jso)
{
return json_object_to_json_string_ext(jso, JSON_C_TO_STRING_SPACED);
}
static void indent(struct printbuf *pb, int level, int flags)
{
if (flags & JSON_C_TO_STRING_PRETTY)
{
if (flags & JSON_C_TO_STRING_PRETTY_TAB)
{
printbuf_memset(pb, -1, '\t', level);
}
else
{
printbuf_memset(pb, -1, ' ', level * 2);
}
}
}
/* json_object_object */
static int json_object_object_to_json_string(struct json_object* jso,
struct printbuf *pb,
int level,
int flags)
{
int had_children = 0;
struct json_object_iter iter;
printbuf_strappend(pb, "{" /*}*/);
if (flags & JSON_C_TO_STRING_PRETTY)
printbuf_strappend(pb, "\n");
json_object_object_foreachC(jso, iter)
{
if (had_children)
{
printbuf_strappend(pb, ",");
if (flags & JSON_C_TO_STRING_PRETTY)
printbuf_strappend(pb, "\n");
}
had_children = 1;
if (flags & JSON_C_TO_STRING_SPACED)
printbuf_strappend(pb, " ");
indent(pb, level+1, flags);
printbuf_strappend(pb, "\"");
json_escape_str(pb, iter.key, strlen(iter.key), flags);
if (flags & JSON_C_TO_STRING_SPACED)
printbuf_strappend(pb, "\": ");
else
printbuf_strappend(pb, "\":");
if(iter.val == NULL)
printbuf_strappend(pb, "null");
else
if (iter.val->_to_json_string(iter.val, pb, level+1,flags) < 0)
return -1;
}
if (flags & JSON_C_TO_STRING_PRETTY)
{
if (had_children)
printbuf_strappend(pb, "\n");
indent(pb,level,flags);
}
if (flags & JSON_C_TO_STRING_SPACED)
return printbuf_strappend(pb, /*{*/ " }");
else
return printbuf_strappend(pb, /*{*/ "}");
}
static void json_object_lh_entry_free(struct lh_entry *ent)
{
if (!ent->k_is_constant)
free(lh_entry_k(ent));
json_object_put((struct json_object*)lh_entry_v(ent));
}
static void json_object_object_delete(struct json_object* jso)
{
lh_table_free(jso->o.c_object);
json_object_generic_delete(jso);
}
struct json_object* json_object_new_object(void)
{
struct json_object *jso = json_object_new(json_type_object);
if (!jso)
return NULL;
jso->_delete = &json_object_object_delete;
jso->_to_json_string = &json_object_object_to_json_string;
jso->o.c_object = lh_kchar_table_new(JSON_OBJECT_DEF_HASH_ENTRIES,
&json_object_lh_entry_free);
if (!jso->o.c_object)
{
json_object_generic_delete(jso);
errno = ENOMEM;
return NULL;
}
return jso;
}
struct lh_table* json_object_get_object(const struct json_object *jso)
{
if (!jso)
return NULL;
switch(jso->o_type)
{
case json_type_object:
return jso->o.c_object;
default:
return NULL;
}
}
int json_object_object_add_ex(struct json_object* jso,
const char *const key,
struct json_object *const val,
const unsigned opts)
{
struct json_object *existing_value = NULL;
struct lh_entry *existing_entry;
unsigned long hash;
assert(json_object_get_type(jso) == json_type_object);
// We lookup the entry and replace the value, rather than just deleting
// and re-adding it, so the existing key remains valid.
hash = lh_get_hash(jso->o.c_object, (const void *)key);
existing_entry = (opts & JSON_C_OBJECT_ADD_KEY_IS_NEW) ? NULL :
lh_table_lookup_entry_w_hash(jso->o.c_object,
(const void *)key, hash);
// The caller must avoid creating loops in the object tree, but do a
// quick check anyway to make sure we're not creating a trivial loop.
if (jso == val)
return -1;
if (!existing_entry)
{
const void *const k = (opts & JSON_C_OBJECT_KEY_IS_CONSTANT) ?
(const void *)key : strdup(key);
if (k == NULL)
return -1;
return lh_table_insert_w_hash(jso->o.c_object, k, val, hash, opts);
}
existing_value = (json_object *) lh_entry_v(existing_entry);
if (existing_value)
json_object_put(existing_value);
existing_entry->v = val;
return 0;
}
int json_object_object_add(struct json_object* jso, const char *key,
struct json_object *val)
{
return json_object_object_add_ex(jso, key, val, 0);
}
int json_object_object_length(const struct json_object *jso)
{
assert(json_object_get_type(jso) == json_type_object);
return lh_table_length(jso->o.c_object);
}
size_t json_c_object_sizeof(void)
{
return sizeof(struct json_object);
}
struct json_object* json_object_object_get(const struct json_object* jso,
const char *key)
{
struct json_object *result = NULL;
json_object_object_get_ex(jso, key, &result);
return result;
}
json_bool json_object_object_get_ex(const struct json_object* jso, const char *key,
struct json_object **value)
{
if (value != NULL)
*value = NULL;
if (NULL == jso)
return FALSE;
switch(jso->o_type)
{
case json_type_object:
return lh_table_lookup_ex(jso->o.c_object, (const void *) key,
(void**) value);
default:
if (value != NULL)
*value = NULL;
return FALSE;
}
}
void json_object_object_del(struct json_object* jso, const char *key)
{
assert(json_object_get_type(jso) == json_type_object);
lh_table_delete(jso->o.c_object, key);
}
/* json_object_boolean */
static int json_object_boolean_to_json_string(struct json_object* jso,
struct printbuf *pb,
int level,
int flags)
{
if (jso->o.c_boolean)
return printbuf_strappend(pb, "true");
return printbuf_strappend(pb, "false");
}
struct json_object* json_object_new_boolean(json_bool b)
{
struct json_object *jso = json_object_new(json_type_boolean);
if (!jso)
return NULL;
jso->_to_json_string = &json_object_boolean_to_json_string;
jso->o.c_boolean = b;
return jso;
}
json_bool json_object_get_boolean(const struct json_object *jso)
{
if (!jso)
return FALSE;
switch(jso->o_type)
{
case json_type_boolean:
return jso->o.c_boolean;
case json_type_int:
return (jso->o.c_int64 != 0);
case json_type_double:
return (jso->o.c_double != 0);
case json_type_string:
return (jso->o.c_string.len != 0);
default:
return FALSE;
}
}
int json_object_set_boolean(struct json_object *jso,json_bool new_value){
if (!jso || jso->o_type!=json_type_boolean)
return 0;
jso->o.c_boolean=new_value;
return 1;
}
/* json_object_int */
static int json_object_int_to_json_string(struct json_object* jso,
struct printbuf *pb,
int level,
int flags)
{
/* room for 19 digits, the sign char, and a null term */
char sbuf[21];
snprintf(sbuf, sizeof(sbuf), "%" PRId64, jso->o.c_int64);
return printbuf_memappend (pb, sbuf, strlen(sbuf));
}
struct json_object* json_object_new_int(int32_t i)
{
struct json_object *jso = json_object_new(json_type_int);
if (!jso)
return NULL;
jso->_to_json_string = &json_object_int_to_json_string;
jso->o.c_int64 = i;
return jso;
}
int32_t json_object_get_int(const struct json_object *jso)
{
int64_t cint64;
enum json_type o_type;
if(!jso) return 0;
o_type = jso->o_type;
cint64 = jso->o.c_int64;
if (o_type == json_type_string)
{
/*
* Parse strings into 64-bit numbers, then use the
* 64-to-32-bit number handling below.
*/
if (json_parse_int64(get_string_component(jso), &cint64) != 0)
return 0; /* whoops, it didn't work. */
o_type = json_type_int;
}
switch(o_type) {
case json_type_int:
/* Make sure we return the correct values for out of range numbers. */
if (cint64 <= INT32_MIN)
return INT32_MIN;
if (cint64 >= INT32_MAX)
return INT32_MAX;
return (int32_t) cint64;
case json_type_double:
if (jso->o.c_double <= INT32_MIN)
return INT32_MIN;
if (jso->o.c_double >= INT32_MAX)
return INT32_MAX;
return (int32_t)jso->o.c_double;
case json_type_boolean:
return jso->o.c_boolean;
default:
return 0;
}
}
int json_object_set_int(struct json_object *jso,int new_value){
if (!jso || jso->o_type!=json_type_int)
return 0;
jso->o.c_int64=new_value;
return 1;
}
struct json_object* json_object_new_int64(int64_t i)
{
struct json_object *jso = json_object_new(json_type_int);
if (!jso)
return NULL;
jso->_to_json_string = &json_object_int_to_json_string;
jso->o.c_int64 = i;
return jso;
}
int64_t json_object_get_int64(const struct json_object *jso)
{
int64_t cint;
if (!jso)
return 0;
switch(jso->o_type)
{
case json_type_int:
return jso->o.c_int64;
case json_type_double:
if (jso->o.c_double >= INT64_MAX)
return INT64_MAX;
if (jso->o.c_double <= INT64_MIN)
return INT64_MIN;
return (int64_t)jso->o.c_double;
case json_type_boolean:
return jso->o.c_boolean;
case json_type_string:
if (json_parse_int64(get_string_component(jso), &cint) == 0)
return cint;
/* FALLTHRU */
default:
return 0;
}
}
int json_object_set_int64(struct json_object *jso,int64_t new_value){
if (!jso || jso->o_type!=json_type_int)
return 0;
jso->o.c_int64=new_value;
return 1;
}
int json_object_int_inc(struct json_object *jso, int64_t val) {
if (!jso || jso->o_type != json_type_int)
return 0;
if (val > 0 && jso->o.c_int64 > INT64_MAX - val) {
jso->o.c_int64 = INT64_MAX;
} else if (val < 0 && jso->o.c_int64 < INT64_MIN - val) {
jso->o.c_int64 = INT64_MIN;
} else {
jso->o.c_int64 += val;
}
return 1;
}
/* json_object_double */
#if defined(HAVE___THREAD)
// i.e. __thread or __declspec(thread)
static SPEC___THREAD char *tls_serialization_float_format = NULL;
#endif
static char *global_serialization_float_format = NULL;
int json_c_set_serialization_double_format(const char *double_format, int global_or_thread)
{
if (global_or_thread == JSON_C_OPTION_GLOBAL)
{
#if defined(HAVE___THREAD)
if (tls_serialization_float_format)
{
free(tls_serialization_float_format);
tls_serialization_float_format = NULL;
}
#endif
if (global_serialization_float_format)
free(global_serialization_float_format);
global_serialization_float_format = double_format ? strdup(double_format) : NULL;
}
else if (global_or_thread == JSON_C_OPTION_THREAD)
{
#if defined(HAVE___THREAD)
if (tls_serialization_float_format)
{
free(tls_serialization_float_format);
tls_serialization_float_format = NULL;
}
tls_serialization_float_format = double_format ? strdup(double_format) : NULL;
#else
_json_c_set_last_err("json_c_set_option: not compiled with __thread support\n");
return -1;
#endif
}
else
{
_json_c_set_last_err("json_c_set_option: invalid global_or_thread value: %d\n", global_or_thread);
return -1;
}
return 0;
}
static int json_object_double_to_json_string_format(struct json_object* jso,
struct printbuf *pb,
int level,
int flags,
const char *format)
{
char buf[128], *p, *q;
int size;
/* Although JSON RFC does not support
NaN or Infinity as numeric values
ECMA 262 section 9.8.1 defines
how to handle these cases as strings */
if (isnan(jso->o.c_double))
{
size = snprintf(buf, sizeof(buf), "NaN");
}
else if (isinf(jso->o.c_double))
{
if(jso->o.c_double > 0)
size = snprintf(buf, sizeof(buf), "Infinity");
else
size = snprintf(buf, sizeof(buf), "-Infinity");
}
else
{
const char *std_format = "%.17g";
int format_drops_decimals = 0;
if (!format)
{
#if defined(HAVE___THREAD)
if (tls_serialization_float_format)
format = tls_serialization_float_format;
else
#endif
if (global_serialization_float_format)
format = global_serialization_float_format;
else
format = std_format;
}
size = snprintf(buf, sizeof(buf), format, jso->o.c_double);
if (size < 0)
return -1;
p = strchr(buf, ',');
if (p)
*p = '.';
else
p = strchr(buf, '.');
if (format == std_format || strstr(format, ".0f") == NULL)
format_drops_decimals = 1;
if (size < (int)sizeof(buf) - 2 &&
isdigit((int)buf[0]) && /* Looks like *some* kind of number */
!p && /* Has no decimal point */
strchr(buf, 'e') == NULL && /* Not scientific notation */
format_drops_decimals)
{
// Ensure it looks like a float, even if snprintf didn't,
// unless a custom format is set to omit the decimal.
strcat(buf, ".0");
size += 2;
}
if (p && (flags & JSON_C_TO_STRING_NOZERO))
{
/* last useful digit, always keep 1 zero */
p++;
for (q=p ; *q ; q++) {
if (*q!='0') p=q;
}
/* drop trailing zeroes */
*(++p) = 0;
size = p-buf;
}
}
// although unlikely, snprintf can fail
if (size < 0)
return -1;
if (size >= (int)sizeof(buf))
// The standard formats are guaranteed not to overrun the buffer,
// but if a custom one happens to do so, just silently truncate.
size = sizeof(buf) - 1;
printbuf_memappend(pb, buf, size);
return size;
}
static int json_object_double_to_json_string_default(struct json_object* jso,
struct printbuf *pb,
int level,
int flags)
{
return json_object_double_to_json_string_format(jso, pb, level, flags,
NULL);
}
int json_object_double_to_json_string(struct json_object* jso,
struct printbuf *pb,
int level,
int flags)
{
return json_object_double_to_json_string_format(jso, pb, level, flags,
(const char *)jso->_userdata);
}
struct json_object* json_object_new_double(double d)
{
struct json_object *jso = json_object_new(json_type_double);
if (!jso)
return NULL;
jso->_to_json_string = &json_object_double_to_json_string_default;
jso->o.c_double = d;
return jso;
}
struct json_object* json_object_new_double_s(double d, const char *ds)
{
char *new_ds;
struct json_object *jso = json_object_new_double(d);
if (!jso)
return NULL;
new_ds = strdup(ds);
if (!new_ds)
{
json_object_generic_delete(jso);
errno = ENOMEM;
return NULL;
}
json_object_set_serializer(jso, json_object_userdata_to_json_string,
new_ds, json_object_free_userdata);
return jso;
}
int json_object_userdata_to_json_string(struct json_object *jso,
struct printbuf *pb, int level, int flags)
{
int userdata_len = strlen((const char *)jso->_userdata);
printbuf_memappend(pb, (const char *)jso->_userdata, userdata_len);
return userdata_len;
}
void json_object_free_userdata(struct json_object *jso, void *userdata)
{
free(userdata);
}
double json_object_get_double(const struct json_object *jso)
{
double cdouble;
char *errPtr = NULL;
if(!jso) return 0.0;
switch(jso->o_type) {
case json_type_double:
return jso->o.c_double;
case json_type_int:
return jso->o.c_int64;
case json_type_boolean:
return jso->o.c_boolean;
case json_type_string:
errno = 0;
cdouble = strtod(get_string_component(jso), &errPtr);
/* if conversion stopped at the first character, return 0.0 */
if (errPtr == get_string_component(jso))
return 0.0;
/*
* Check that the conversion terminated on something sensible
*
* For example, { "pay" : 123AB } would parse as 123.
*/
if (*errPtr != '\0')
return 0.0;
/*
* If strtod encounters a string which would exceed the
* capacity of a double, it returns +/- HUGE_VAL and sets
* errno to ERANGE. But +/- HUGE_VAL is also a valid result
* from a conversion, so we need to check errno.
*
* Underflow also sets errno to ERANGE, but it returns 0 in
* that case, which is what we will return anyway.
*
* See CERT guideline ERR30-C
*/
if ((HUGE_VAL == cdouble || -HUGE_VAL == cdouble) &&
(ERANGE == errno))
cdouble = 0.0;
return cdouble;
default:
return 0.0;
}
}
int json_object_set_double(struct json_object *jso,double new_value){
if (!jso || jso->o_type!=json_type_double)
return 0;
jso->o.c_double=new_value;
return 1;
}
/* json_object_string */
static int json_object_string_to_json_string(struct json_object* jso,
struct printbuf *pb,
int level,
int flags)
{
printbuf_strappend(pb, "\"");
json_escape_str(pb, get_string_component(jso), jso->o.c_string.len, flags);
printbuf_strappend(pb, "\"");
return 0;
}
static void json_object_string_delete(struct json_object* jso)
{
if(jso->o.c_string.len >= LEN_DIRECT_STRING_DATA)
free(jso->o.c_string.str.ptr);
json_object_generic_delete(jso);
}
struct json_object* json_object_new_string(const char *s)
{
struct json_object *jso = json_object_new(json_type_string);
if (!jso)
return NULL;
jso->_delete = &json_object_string_delete;
jso->_to_json_string = &json_object_string_to_json_string;
jso->o.c_string.len = strlen(s);
if(jso->o.c_string.len < LEN_DIRECT_STRING_DATA) {
memcpy(jso->o.c_string.str.data, s, jso->o.c_string.len);
} else {
jso->o.c_string.str.ptr = strdup(s);
if (!jso->o.c_string.str.ptr)
{
json_object_generic_delete(jso);
errno = ENOMEM;
return NULL;
}
}
return jso;
}
struct json_object* json_object_new_string_len(const char *s, int len)
{
char *dstbuf;
struct json_object *jso = json_object_new(json_type_string);
if (!jso)
return NULL;
jso->_delete = &json_object_string_delete;
jso->_to_json_string = &json_object_string_to_json_string;
if(len < LEN_DIRECT_STRING_DATA) {
dstbuf = jso->o.c_string.str.data;
} else {
jso->o.c_string.str.ptr = (char*)malloc(len + 1);
if (!jso->o.c_string.str.ptr)
{
json_object_generic_delete(jso);
errno = ENOMEM;
return NULL;
}
dstbuf = jso->o.c_string.str.ptr;
}
memcpy(dstbuf, (const void *)s, len);
dstbuf[len] = '\0';
jso->o.c_string.len = len;
return jso;
}
const char* json_object_get_string(struct json_object *jso)
{
if (!jso)
return NULL;
switch(jso->o_type)
{
case json_type_string:
return get_string_component(jso);
default:
return json_object_to_json_string(jso);
}
}
int json_object_get_string_len(const struct json_object *jso)
{
if (!jso)
return 0;
switch(jso->o_type)
{
case json_type_string:
return jso->o.c_string.len;
default:
return 0;
}
}
int json_object_set_string(json_object* jso, const char* s) {
return json_object_set_string_len(jso, s, (int)(strlen(s)));
}
int json_object_set_string_len(json_object* jso, const char* s, int len){
char *dstbuf;
if (jso==NULL || jso->o_type!=json_type_string) return 0;
if (len<LEN_DIRECT_STRING_DATA) {
dstbuf=jso->o.c_string.str.data;
if (jso->o.c_string.len>=LEN_DIRECT_STRING_DATA) free(jso->o.c_string.str.ptr);
} else {
dstbuf=(char *)malloc(len+1);
if (dstbuf==NULL) return 0;
if (jso->o.c_string.len>=LEN_DIRECT_STRING_DATA) free(jso->o.c_string.str.ptr);
jso->o.c_string.str.ptr=dstbuf;
}
jso->o.c_string.len=len;
memcpy(dstbuf, (const void *)s, len);
dstbuf[len] = '\0';
return 1;
}
/* json_object_array */
static int json_object_array_to_json_string(struct json_object* jso,
struct printbuf *pb,
int level,
int flags)
{
int had_children = 0;
size_t ii;
printbuf_strappend(pb, "[");
if (flags & JSON_C_TO_STRING_PRETTY)
printbuf_strappend(pb, "\n");
for(ii=0; ii < json_object_array_length(jso); ii++)
{
struct json_object *val;
if (had_children)
{
printbuf_strappend(pb, ",");
if (flags & JSON_C_TO_STRING_PRETTY)
printbuf_strappend(pb, "\n");
}
had_children = 1;
if (flags & JSON_C_TO_STRING_SPACED)
printbuf_strappend(pb, " ");
indent(pb, level + 1, flags);
val = json_object_array_get_idx(jso, ii);
if(val == NULL)
printbuf_strappend(pb, "null");
else
if (val->_to_json_string(val, pb, level+1, flags) < 0)
return -1;
}
if (flags & JSON_C_TO_STRING_PRETTY)
{
if (had_children)
printbuf_strappend(pb, "\n");
indent(pb,level,flags);
}
if (flags & JSON_C_TO_STRING_SPACED)
return printbuf_strappend(pb, " ]");
return printbuf_strappend(pb, "]");
}
static void json_object_array_entry_free(void *data)
{
json_object_put((struct json_object*)data);
}
static void json_object_array_delete(struct json_object* jso)
{
array_list_free(jso->o.c_array);
json_object_generic_delete(jso);
}
struct json_object* json_object_new_array(void)
{
struct json_object *jso = json_object_new(json_type_array);
if (!jso)
return NULL;
jso->_delete = &json_object_array_delete;
jso->_to_json_string = &json_object_array_to_json_string;
jso->o.c_array = array_list_new(&json_object_array_entry_free);
if(jso->o.c_array == NULL)
{
free(jso);
return NULL;
}
return jso;
}
struct array_list* json_object_get_array(const struct json_object *jso)
{
if (!jso)
return NULL;
switch(jso->o_type)
{
case json_type_array:
return jso->o.c_array;
default:
return NULL;
}
}
void json_object_array_sort(struct json_object *jso,
int(*sort_fn)(const void *, const void *))
{
assert(json_object_get_type(jso) == json_type_array);
array_list_sort(jso->o.c_array, sort_fn);
}
struct json_object* json_object_array_bsearch(
const struct json_object *key,
const struct json_object *jso,
int (*sort_fn)(const void *, const void *))
{
struct json_object **result;
assert(json_object_get_type(jso) == json_type_array);
result = (struct json_object **)array_list_bsearch(
(const void **)(void *)&key, jso->o.c_array, sort_fn);
if (!result)
return NULL;
return *result;
}
size_t json_object_array_length(const struct json_object *jso)
{
assert(json_object_get_type(jso) == json_type_array);
return array_list_length(jso->o.c_array);
}
int json_object_array_add(struct json_object *jso,struct json_object *val)
{
assert(json_object_get_type(jso) == json_type_array);
return array_list_add(jso->o.c_array, val);
}
int json_object_array_put_idx(struct json_object *jso, size_t idx,
struct json_object *val)
{
assert(json_object_get_type(jso) == json_type_array);
return array_list_put_idx(jso->o.c_array, idx, val);
}
int json_object_array_del_idx(struct json_object *jso, size_t idx, size_t count)
{
assert(json_object_get_type(jso) == json_type_array);
return array_list_del_idx(jso->o.c_array, idx, count);
}
struct json_object* json_object_array_get_idx(const struct json_object *jso,
size_t idx)
{
assert(json_object_get_type(jso) == json_type_array);
return (struct json_object*)array_list_get_idx(jso->o.c_array, idx);
}
static int json_array_equal(struct json_object* jso1,
struct json_object* jso2)
{
size_t len, i;
len = json_object_array_length(jso1);
if (len != json_object_array_length(jso2))
return 0;
for (i = 0; i < len; i++) {
if (!json_object_equal(json_object_array_get_idx(jso1, i),
json_object_array_get_idx(jso2, i)))
return 0;
}
return 1;
}
static int json_object_all_values_equal(struct json_object* jso1,
struct json_object* jso2)
{
struct json_object_iter iter;
struct json_object *sub;
assert(json_object_get_type(jso1) == json_type_object);
assert(json_object_get_type(jso2) == json_type_object);
/* Iterate over jso1 keys and see if they exist and are equal in jso2 */
json_object_object_foreachC(jso1, iter) {
if (!lh_table_lookup_ex(jso2->o.c_object, (void*)iter.key,
(void**)(void *)&sub))
return 0;
if (!json_object_equal(iter.val, sub))
return 0;
}
/* Iterate over jso2 keys to see if any exist that are not in jso1 */
json_object_object_foreachC(jso2, iter) {
if (!lh_table_lookup_ex(jso1->o.c_object, (void*)iter.key,
(void**)(void *)&sub))
return 0;
}
return 1;
}
int json_object_equal(struct json_object* jso1, struct json_object* jso2)
{
if (jso1 == jso2)
return 1;
if (!jso1 || !jso2)
return 0;
if (jso1->o_type != jso2->o_type)
return 0;
switch(jso1->o_type) {
case json_type_boolean:
return (jso1->o.c_boolean == jso2->o.c_boolean);
case json_type_double:
return (jso1->o.c_double == jso2->o.c_double);
case json_type_int:
return (jso1->o.c_int64 == jso2->o.c_int64);
case json_type_string:
return (jso1->o.c_string.len == jso2->o.c_string.len &&
memcmp(get_string_component(jso1),
get_string_component(jso2),
jso1->o.c_string.len) == 0);
case json_type_object:
return json_object_all_values_equal(jso1, jso2);
case json_type_array:
return json_array_equal(jso1, jso2);
case json_type_null:
return 1;
};
return 0;
}
static int json_object_copy_serializer_data(struct json_object *src, struct json_object *dst)
{
if (!src->_userdata && !src->_user_delete)
return 0;
if (dst->_to_json_string == json_object_userdata_to_json_string)
{
dst->_userdata = strdup(src->_userdata);
}
// else if ... other supported serializers ...
else
{
_json_c_set_last_err("json_object_deep_copy: unable to copy unknown serializer data: %p\n", dst->_to_json_string);
return -1;
}
dst->_user_delete = src->_user_delete;
return 0;
}
/**
* The default shallow copy implementation. Simply creates a new object of the same
* type but does *not* copy over _userdata nor retain any custom serializer.
* If custom serializers are in use, json_object_deep_copy() must be passed a shallow copy
* implementation that is aware of how to copy them.
*
* This always returns -1 or 1. It will never return 2 since it does not copy the serializer.
*/
int json_c_shallow_copy_default(json_object *src, json_object *parent, const char *key, size_t index, json_object **dst)
{
switch (src->o_type) {
case json_type_boolean:
*dst = json_object_new_boolean(src->o.c_boolean);
break;
case json_type_double:
*dst = json_object_new_double(src->o.c_double);
break;
case json_type_int:
*dst = json_object_new_int64(src->o.c_int64);
break;
case json_type_string:
*dst = json_object_new_string(get_string_component(src));
break;
case json_type_object:
*dst = json_object_new_object();
break;
case json_type_array:
*dst = json_object_new_array();
break;
default:
errno = EINVAL;
return -1;
}
if (!*dst) {
errno = ENOMEM;
return -1;
}
(*dst)->_to_json_string = src->_to_json_string;
// _userdata and _user_delete are copied later
return 1;
}
/*
* The actual guts of json_object_deep_copy(), with a few additional args
* needed so we can keep track of where we are within the object tree.
*
* Note: caller is responsible for freeing *dst if this fails and returns -1.
*/
static int json_object_deep_copy_recursive(struct json_object *src, struct json_object *parent, const char *key_in_parent, size_t index_in_parent, struct json_object **dst, json_c_shallow_copy_fn *shallow_copy)
{
struct json_object_iter iter;
size_t src_array_len, ii;
int shallow_copy_rc = 0;
shallow_copy_rc = shallow_copy(src, parent, key_in_parent, index_in_parent, dst);
/* -1=error, 1=object created ok, 2=userdata set */
if (shallow_copy_rc < 1)
{
errno = EINVAL;
return -1;
}
assert(*dst != NULL);
switch (src->o_type) {
case json_type_object:
json_object_object_foreachC(src, iter) {
struct json_object *jso = NULL;
/* This handles the `json_type_null` case */
if (!iter.val)
jso = NULL;
else if (json_object_deep_copy_recursive(iter.val, src, iter.key, -1, &jso, shallow_copy) < 0)
{
json_object_put(jso);
return -1;
}
if (json_object_object_add(*dst, iter.key, jso) < 0)
{
json_object_put(jso);
return -1;
}
}
break;
case json_type_array:
src_array_len = json_object_array_length(src);
for (ii = 0; ii < src_array_len; ii++) {
struct json_object *jso = NULL;
struct json_object *jso1 = json_object_array_get_idx(src, ii);
/* This handles the `json_type_null` case */
if (!jso1)
jso = NULL;
else if (json_object_deep_copy_recursive(jso1, src, NULL, ii, &jso, shallow_copy) < 0)
{
json_object_put(jso);
return -1;
}
if (json_object_array_add(*dst, jso) < 0)
{
json_object_put(jso);
return -1;
}
}
break;
default:
break;
/* else, nothing to do, shallow_copy already did. */
}
if (shallow_copy_rc != 2)
return json_object_copy_serializer_data(src, *dst);
return 0;
}
int json_object_deep_copy(struct json_object *src, struct json_object **dst, json_c_shallow_copy_fn *shallow_copy)
{
int rc;
/* Check if arguments are sane ; *dst must not point to a non-NULL object */
if (!src || !dst || *dst) {
errno = EINVAL;
return -1;
}
if (shallow_copy == NULL)
shallow_copy = json_c_shallow_copy_default;
rc = json_object_deep_copy_recursive(src, NULL, NULL, -1, dst, shallow_copy);
if (rc < 0) {
json_object_put(*dst);
*dst = NULL;
}
return rc;
}