/*
 * 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>
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#include <math.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "arraylist.h"
#include "debug.h"
#include "json_inttypes.h"
#include "json_object.h"
#include "json_object_private.h"
#include "json_util.h"
#include "linkhash.h"
#include "math_compat.h"
#include "printbuf.h"
#include "snprintf_compat.h"
#include "strdup_compat.h"

/* Avoid ctype.h and locale overhead */
#define is_plain_digit(c) ((c) >= '0' && (c) <= '9')

#if SIZEOF_LONG_LONG != SIZEOF_INT64_T
#error The long long type is not 64-bits
#endif

#ifndef SSIZE_T_MAX
#if SIZEOF_SSIZE_T == SIZEOF_INT
#define SSIZE_T_MAX INT_MAX
#elif SIZEOF_SSIZE_T == SIZEOF_LONG
#define SSIZE_T_MAX LONG_MAX
#elif SIZEOF_SSIZE_T == SIZEOF_LONG_LONG
#define SSIZE_T_MAX LLONG_MAX
#else
#error Unable to determine size of ssize_t
#endif
#endif

const char *json_number_chars = "0123456789.+-eE"; /* Unused, but part of public API, drop for 1.0 */
const char *json_hex_chars = "0123456789abcdefABCDEF";

static void json_object_generic_delete(struct json_object *jso);

#if defined(_MSC_VER) && (_MSC_VER <= 1800)
/* VS2013 doesn't know about "inline" */
#define inline __inline
#elif defined(AIX_CC)
#define inline
#endif

/* define colors */
#define ANSI_COLOR_RESET "\033[0m"
#define ANSI_COLOR_FG_GREEN "\033[0;32m"
#define ANSI_COLOR_FG_BLUE "\033[0;34m"
#define ANSI_COLOR_FG_MAGENTA "\033[0;35m"

/*
 * Helper functions to more safely cast to a particular type of json_object
 */
static inline struct json_object_object *JC_OBJECT(struct json_object *jso)
{
    return (void *)jso;
}
static inline const struct json_object_object *JC_OBJECT_C(const struct json_object *jso)
{
    return (const void *)jso;
}
static inline struct json_object_array *JC_ARRAY(struct json_object *jso)
{
    return (void *)jso;
}
static inline const struct json_object_array *JC_ARRAY_C(const struct json_object *jso)
{
    return (const void *)jso;
}
static inline struct json_object_boolean *JC_BOOL(struct json_object *jso)
{
    return (void *)jso;
}
static inline const struct json_object_boolean *JC_BOOL_C(const struct json_object *jso)
{
    return (const void *)jso;
}
static inline struct json_object_double *JC_DOUBLE(struct json_object *jso)
{
    return (void *)jso;
}
static inline const struct json_object_double *JC_DOUBLE_C(const struct json_object *jso)
{
    return (const void *)jso;
}
static inline struct json_object_int *JC_INT(struct json_object *jso)
{
    return (void *)jso;
}
static inline const struct json_object_int *JC_INT_C(const struct json_object *jso)
{
    return (const void *)jso;
}
static inline struct json_object_string *JC_STRING(struct json_object *jso)
{
    return (void *)jso;
}
static inline const struct json_object_string *JC_STRING_C(const struct json_object *jso)
{
    return (const void *)jso;
}

#define JC_CONCAT(a, b) a##b
#define JC_CONCAT3(a, b, c) a##b##c

#define JSON_OBJECT_NEW(jtype)                                                           \
    (struct JC_CONCAT(json_object_, jtype) *)json_object_new(                        \
        JC_CONCAT(json_type_, jtype), sizeof(struct JC_CONCAT(json_object_, jtype)), \
        &JC_CONCAT3(json_object_, jtype, _to_json_string))

static inline struct json_object *json_object_new(enum json_type o_type, size_t alloc_size,
                                                  json_object_to_json_string_fn *to_json_string);

static void json_object_object_delete(struct json_object *jso_base);
static void json_object_string_delete(struct json_object *jso);
static void json_object_array_delete(struct json_object *jso);

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;
static json_object_to_json_string_fn _json_object_userdata_to_json_string;

#ifndef JSON_NORETURN
#if defined(_MSC_VER)
#define JSON_NORETURN __declspec(noreturn)
#elif defined(__OS400__)
#define JSON_NORETURN
#else
/* 'cold' attribute is for optimization, telling the computer this code
 * path is unlikely.
 */
#define JSON_NORETURN __attribute__((noreturn, cold))
#endif
#endif
/**
 * Abort and optionally print a message on standard error.
 * This should be used rather than assert() for unconditional abortion
 * (in particular for code paths which are never supposed to be run).
 * */
JSON_NORETURN static void json_abort(const char *message);

/* helper for accessing the optimized string data component in json_object
 */
static inline char *get_string_component_mutable(struct json_object *jso)
{
    if (JC_STRING_C(jso)->len < 0)
    {
        /* Due to json_object_set_string(), we might have a pointer */
        return JC_STRING(jso)->c_string.pdata;
    }
    return JC_STRING(jso)->c_string.idata;
}
static inline const char *get_string_component(const struct json_object *jso)
{
    return get_string_component_mutable((void *)(uintptr_t)(const void *)jso);
}

/* string escaping */

static int json_escape_str(struct printbuf *pb, const char *str, size_t len, int flags)
{
    size_t pos = 0, start_offset = 0;
    unsigned char c;
    while (len)
    {
        --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)
                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)
                    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)
        printbuf_memappend(pb, str + start_offset, pos - start_offset);
    return 0;
}

/* reference counting */

struct json_object *json_object_get(struct json_object *jso)
{
    if (!jso)
        return jso;

    // Don't overflow the refcounter.
    assert(jso->_ref_count < UINT32_MAX);

#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);
    switch (jso->o_type)
    {
    case json_type_object: json_object_object_delete(jso); break;
    case json_type_array: json_object_array_delete(jso); break;
    case json_type_string: json_object_string_delete(jso); break;
    default: json_object_generic_delete(jso); break;
    }
    return 1;
}

/* generic object construction and destruction parts */

static void json_object_generic_delete(struct json_object *jso)
{
    printbuf_free(jso->_pb);
    free(jso);
}

static inline struct json_object *json_object_new(enum json_type o_type, size_t alloc_size,
                                                  json_object_to_json_string_fn *to_json_string)
{
    struct json_object *jso;

    jso = (struct json_object *)malloc(alloc_size);
    if (!jso)
        return NULL;

    jso->o_type = o_type;
    jso->_ref_count = 1;
    jso->_to_json_string = to_json_string;
    jso->_pb = NULL;
    jso->_user_delete = NULL;
    jso->_userdata = NULL;
    //jso->...   // Type-specific fields must be set by caller

    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 size_t 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, "{" /*}*/);
    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 && !(flags & JSON_C_TO_STRING_PRETTY))
            printbuf_strappend(pb, " ");
        indent(pb, level + 1, flags);
        if (flags & JSON_C_TO_STRING_COLOR)
            printbuf_strappend(pb, ANSI_COLOR_FG_BLUE);

        printbuf_strappend(pb, "\"");
        json_escape_str(pb, iter.key, strlen(iter.key), flags);
        printbuf_strappend(pb, "\"");

        if (flags & JSON_C_TO_STRING_COLOR)
            printbuf_strappend(pb, ANSI_COLOR_RESET);

        if (flags & JSON_C_TO_STRING_SPACED)
            printbuf_strappend(pb, ": ");
        else
            printbuf_strappend(pb, ":");

        if (iter.val == NULL) {
            if (flags & JSON_C_TO_STRING_COLOR)
                printbuf_strappend(pb, ANSI_COLOR_FG_MAGENTA);
            printbuf_strappend(pb, "null");
            if (flags & JSON_C_TO_STRING_COLOR)
                printbuf_strappend(pb, ANSI_COLOR_RESET);
        } else if (iter.val->_to_json_string(iter.val, pb, level + 1, flags) < 0)
            return -1;
    }
    if ((flags & JSON_C_TO_STRING_PRETTY) && had_children)
    {
        printbuf_strappend(pb, "\n");
        indent(pb, level, flags);
    }
    if (flags & JSON_C_TO_STRING_SPACED && !(flags & JSON_C_TO_STRING_PRETTY))
        return printbuf_strappend(pb, /*{*/ " }");
    else
        return printbuf_strappend(pb, /*{*/ "}");
}

static void json_object_lh_entry_free(struct lh_entry *ent)
{
    if (!lh_entry_k_is_constant(ent))
        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_base)
{
    lh_table_free(JC_OBJECT(jso_base)->c_object);
    json_object_generic_delete(jso_base);
}

struct json_object *json_object_new_object(void)
{
    struct json_object_object *jso = JSON_OBJECT_NEW(object);
    if (!jso)
        return NULL;
    jso->c_object =
        lh_kchar_table_new(JSON_OBJECT_DEF_HASH_ENTRIES, &json_object_lh_entry_free);
    if (!jso->c_object)
    {
        json_object_generic_delete(&jso->base);
        errno = ENOMEM;
        return NULL;
    }
    return &jso->base;
}

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 JC_OBJECT_C(jso)->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(JC_OBJECT(jso)->c_object, (const void *)key);
    existing_entry =
        (opts & JSON_C_OBJECT_ADD_KEY_IS_NEW)
            ? NULL
            : lh_table_lookup_entry_w_hash(JC_OBJECT(jso)->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_ADD_CONSTANT_KEY) ? (const void *)key : _strdup(key);
        if (k == NULL)
            return -1;
        return lh_table_insert_w_hash(JC_OBJECT(jso)->c_object, k, val, hash, opts);
    }
    existing_value = (json_object *)lh_entry_v(existing_entry);
    if (existing_value)
        json_object_put(existing_value);
    lh_entry_set_val(existing_entry, 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(JC_OBJECT_C(jso)->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 0;

    switch (jso->o_type)
    {
    case json_type_object:
        return lh_table_lookup_ex(JC_OBJECT_C(jso)->c_object, (const void *)key,
                                  (void **)value);
    default:
        if (value != NULL)
            *value = NULL;
        return 0;
    }
}

void json_object_object_del(struct json_object *jso, const char *key)
{
    assert(json_object_get_type(jso) == json_type_object);
    lh_table_delete(JC_OBJECT(jso)->c_object, key);
}

/* json_object_boolean */

static size_t json_object_boolean_to_json_string(struct json_object *jso, struct printbuf *pb,
                                              int level, int flags)
{
    size_t ret;

    if (flags & JSON_C_TO_STRING_COLOR)
        printbuf_strappend(pb, ANSI_COLOR_FG_MAGENTA);

    if (JC_BOOL(jso)->c_boolean)
        ret = printbuf_strappend(pb, "true");
    else
        ret = printbuf_strappend(pb, "false");
    if (ret > -1 && flags & JSON_C_TO_STRING_COLOR)
        return printbuf_strappend(pb, ANSI_COLOR_RESET);
    return ret;
}

struct json_object *json_object_new_boolean(json_bool b)
{
    struct json_object_boolean *jso = JSON_OBJECT_NEW(boolean);
    if (!jso)
        return NULL;
    jso->c_boolean = b;
    return &jso->base;
}

json_bool json_object_get_boolean(const struct json_object *jso)
{
    if (!jso)
        return 0;
    switch (jso->o_type)
    {
    case json_type_boolean: return JC_BOOL_C(jso)->c_boolean;
    case json_type_int:
        switch (JC_INT_C(jso)->cint_type)
        {
        case json_object_int_type_int64: return (JC_INT_C(jso)->cint.c_int64 != 0);
        case json_object_int_type_uint64: return (JC_INT_C(jso)->cint.c_uint64 != 0);
        default: json_abort("invalid cint_type");
        }
    case json_type_double: return (JC_DOUBLE_C(jso)->c_double != 0);
    case json_type_string: return (JC_STRING_C(jso)->len != 0);
    default: return 0;
    }
}

int json_object_set_boolean(struct json_object *jso, json_bool new_value)
{
    if (!jso || jso->o_type != json_type_boolean)
        return 0;
    JC_BOOL(jso)->c_boolean = new_value;
    return 1;
}

/* json_object_int */

static size_t 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];
    if (JC_INT(jso)->cint_type == json_object_int_type_int64)
        snprintf(sbuf, sizeof(sbuf), "%" PRId64, JC_INT(jso)->cint.c_int64);
    else
        snprintf(sbuf, sizeof(sbuf), "%" PRIu64, JC_INT(jso)->cint.c_uint64);
    return printbuf_memappend(pb, sbuf, strlen(sbuf));
}

struct json_object *json_object_new_int(int32_t i)
{
    return json_object_new_int64(i);
}

int32_t json_object_get_int(const struct json_object *jso)
{
    int64_t cint64 = 0;
    double cdouble;
    enum json_type o_type;

    if (!jso)
        return 0;

    o_type = jso->o_type;
    if (o_type == json_type_int)
    {
        const struct json_object_int *jsoint = JC_INT_C(jso);
        if (jsoint->cint_type == json_object_int_type_int64)
        {
            cint64 = jsoint->cint.c_int64;
        }
        else
        {
            if (jsoint->cint.c_uint64 >= INT64_MAX)
                cint64 = INT64_MAX;
            else
                cint64 = (int64_t)jsoint->cint.c_uint64;
        }
    }
    else 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:
        cdouble = JC_DOUBLE_C(jso)->c_double;
        if (cdouble <= INT32_MIN)
            return INT32_MIN;
        if (cdouble >= INT32_MAX)
            return INT32_MAX;
        return (int32_t)cdouble;
    case json_type_boolean: return JC_BOOL_C(jso)->c_boolean;
    default: return 0;
    }
}

int json_object_set_int(struct json_object *jso, int new_value)
{
    return json_object_set_int64(jso, (int64_t)new_value);
}

struct json_object *json_object_new_int64(int64_t i)
{
    struct json_object_int *jso = JSON_OBJECT_NEW(int);
    if (!jso)
        return NULL;
    jso->cint.c_int64 = i;
    jso->cint_type = json_object_int_type_int64;
    return &jso->base;
}

struct json_object *json_object_new_uint64(uint64_t i)
{
    struct json_object_int *jso = JSON_OBJECT_NEW(int);
    if (!jso)
        return NULL;
    jso->cint.c_uint64 = i;
    jso->cint_type = json_object_int_type_uint64;
    return &jso->base;
}

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:
    {
        const struct json_object_int *jsoint = JC_INT_C(jso);
        switch (jsoint->cint_type)
        {
        case json_object_int_type_int64: return jsoint->cint.c_int64;
        case json_object_int_type_uint64:
            if (jsoint->cint.c_uint64 >= INT64_MAX)
                return INT64_MAX;
            return (int64_t)jsoint->cint.c_uint64;
        default: json_abort("invalid cint_type");
        }
    }
    case json_type_double:
        // INT64_MAX can't be exactly represented as a double
        // so cast to tell the compiler it's ok to round up.
        if (JC_DOUBLE_C(jso)->c_double >= (double)INT64_MAX)
            return INT64_MAX;
        if (JC_DOUBLE_C(jso)->c_double <= INT64_MIN)
            return INT64_MIN;
        return (int64_t)JC_DOUBLE_C(jso)->c_double;
    case json_type_boolean: return JC_BOOL_C(jso)->c_boolean;
    case json_type_string:
        if (json_parse_int64(get_string_component(jso), &cint) == 0)
            return cint;
        /* FALLTHRU */
    default: return 0;
    }
}

uint64_t json_object_get_uint64(const struct json_object *jso)
{
    uint64_t cuint;

    if (!jso)
        return 0;
    switch (jso->o_type)
    {
    case json_type_int:
    {
        const struct json_object_int *jsoint = JC_INT_C(jso);
        switch (jsoint->cint_type)
        {
        case json_object_int_type_int64:
            if (jsoint->cint.c_int64 < 0)
                return 0;
            return (uint64_t)jsoint->cint.c_int64;
        case json_object_int_type_uint64: return jsoint->cint.c_uint64;
        default: json_abort("invalid cint_type");
        }
    }
    case json_type_double:
        // UINT64_MAX can't be exactly represented as a double
        // so cast to tell the compiler it's ok to round up.
        if (JC_DOUBLE_C(jso)->c_double >= (double)UINT64_MAX)
            return UINT64_MAX;
        if (JC_DOUBLE_C(jso)->c_double < 0)
            return 0;
        return (uint64_t)JC_DOUBLE_C(jso)->c_double;
    case json_type_boolean: return JC_BOOL_C(jso)->c_boolean;
    case json_type_string:
        if (json_parse_uint64(get_string_component(jso), &cuint) == 0)
            return cuint;
        /* 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;
    JC_INT(jso)->cint.c_int64 = new_value;
    JC_INT(jso)->cint_type = json_object_int_type_int64;
    return 1;
}

int json_object_set_uint64(struct json_object *jso, uint64_t new_value)
{
    if (!jso || jso->o_type != json_type_int)
        return 0;
    JC_INT(jso)->cint.c_uint64 = new_value;
    JC_INT(jso)->cint_type = json_object_int_type_uint64;
    return 1;
}

int json_object_int_inc(struct json_object *jso, int64_t val)
{
    struct json_object_int *jsoint;
    if (!jso || jso->o_type != json_type_int)
        return 0;
    jsoint = JC_INT(jso);
    switch (jsoint->cint_type)
    {
    case json_object_int_type_int64:
        if (val > 0 && jsoint->cint.c_int64 > INT64_MAX - val)
        {
            jsoint->cint.c_uint64 = (uint64_t)jsoint->cint.c_int64 + (uint64_t)val;
            jsoint->cint_type = json_object_int_type_uint64;
        }
        else if (val < 0 && jsoint->cint.c_int64 < INT64_MIN - val)
        {
            jsoint->cint.c_int64 = INT64_MIN;
        }
        else
        {
            jsoint->cint.c_int64 += val;
        }
        return 1;
    case json_object_int_type_uint64:
        if (val > 0 && jsoint->cint.c_uint64 > UINT64_MAX - (uint64_t)val)
        {
            jsoint->cint.c_uint64 = UINT64_MAX;
        }
        else if (val < 0 && jsoint->cint.c_uint64 < (uint64_t)(-val))
        {
            jsoint->cint.c_int64 = (int64_t)jsoint->cint.c_uint64 + val;
            jsoint->cint_type = json_object_int_type_int64;
        }
        else if (val < 0 && jsoint->cint.c_uint64 >= (uint64_t)(-val))
        {
            jsoint->cint.c_uint64 -= (uint64_t)(-val);
        }
        else
        {
            jsoint->cint.c_uint64 += val;
        }
        return 1;
    default: json_abort("invalid cint_type");
    }
}

/* 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);
        if (double_format)
        {
            char *p = _strdup(double_format);
            if (p == NULL)
            {
                _json_c_set_last_err("json_c_set_serialization_double_format: "
                                     "out of memory\n");
                return -1;
            }
            global_serialization_float_format = p;
        }
        else
        {
            global_serialization_float_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;
        }
        if (double_format)
        {
            char *p = strdup(double_format);
            if (p == NULL)
            {
                _json_c_set_last_err("json_c_set_serialization_double_format: "
                                     "out of memory\n");
                return -1;
            }
            tls_serialization_float_format = p;
        }
        else
        {
            tls_serialization_float_format = NULL;
        }
#else
        _json_c_set_last_err("json_c_set_serialization_double_format: not compiled "
                             "with __thread support\n");
        return -1;
#endif
    }
    else
    {
        _json_c_set_last_err("json_c_set_serialization_double_format: invalid "
                             "global_or_thread value: %d\n", global_or_thread);
        return -1;
    }
    return 0;
}

static size_t json_object_double_to_json_string_format(struct json_object *jso, struct printbuf *pb,
                                                    int level, int flags, const char *format)
{
    struct json_object_double *jsodbl = JC_DOUBLE(jso);
    char buf[128], *p, *q;
    size_t 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(jsodbl->c_double))
    {
        size = snprintf(buf, sizeof(buf), "NaN");
    }
    else if (isinf(jsodbl->c_double))
    {
        if (jsodbl->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;
        int looks_numeric = 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, jsodbl->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;

        looks_numeric = /* Looks like *some* kind of number */
            is_plain_digit(buf[0]) || (size > 1 && buf[0] == '-' && is_plain_digit(buf[1]));

        if (size < (int)sizeof(buf) - 2 && looks_numeric && !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 */
            if (*p != 0)
                *(++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 size_t 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);
}

size_t 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_double *jso = JSON_OBJECT_NEW(double);
    if (!jso)
        return NULL;
    jso->base._to_json_string = &json_object_double_to_json_string_default;
    jso->c_double = d;
    return &jso->base;
}

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;
}

/*
 * A wrapper around json_object_userdata_to_json_string() used only
 * by json_object_new_double_s() just so json_object_set_double() can
 * detect when it needs to reset the serializer to the default.
 */
static size_t _json_object_userdata_to_json_string(struct json_object *jso, struct printbuf *pb,
                                                int level, int flags)
{
    return json_object_userdata_to_json_string(jso, pb, level, flags);
}

size_t json_object_userdata_to_json_string(struct json_object *jso, struct printbuf *pb, int level,
                                        int flags)
{
    size_t 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 JC_DOUBLE_C(jso)->c_double;
    case json_type_int:
        switch (JC_INT_C(jso)->cint_type)
        {
        case json_object_int_type_int64: return (double)JC_INT_C(jso)->cint.c_int64;
        case json_object_int_type_uint64: return (double)JC_INT_C(jso)->cint.c_uint64;
        default: json_abort("invalid cint_type");
        }
    case json_type_boolean: return JC_BOOL_C(jso)->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))
        {
            errno = EINVAL;
            return 0.0;
        }

        /*
         * Check that the conversion terminated on something sensible
         *
         * For example, { "pay" : 123AB } would parse as 123.
         */
        if (*errPtr != '\0')
        {
            errno = EINVAL;
            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: errno = EINVAL; 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;
    JC_DOUBLE(jso)->c_double = new_value;
    if (jso->_to_json_string == &_json_object_userdata_to_json_string)
        json_object_set_serializer(jso, NULL, NULL, NULL);
    return 1;
}

/* json_object_string */

static size_t json_object_string_to_json_string(struct json_object *jso, struct printbuf *pb,
                                             int level, int flags)
{
    ssize_t len = JC_STRING(jso)->len;
    if (flags & JSON_C_TO_STRING_COLOR)
        printbuf_strappend(pb, ANSI_COLOR_FG_GREEN);
    printbuf_strappend(pb, "\"");
    json_escape_str(pb, get_string_component(jso), len < 0 ? -(ssize_t)len : len, flags);
    printbuf_strappend(pb, "\"");
    if (flags & JSON_C_TO_STRING_COLOR)
        printbuf_strappend(pb, ANSI_COLOR_RESET);
    return 0;
}

static void json_object_string_delete(struct json_object *jso)
{
    if (JC_STRING(jso)->len < 0)
        free(JC_STRING(jso)->c_string.pdata);
    json_object_generic_delete(jso);
}

static struct json_object *_json_object_new_string(const char *s, const size_t len)
{
    size_t objsize;
    struct json_object_string *jso;

    /*
     * Structures           Actual memory layout
     * -------------------  --------------------
     * [json_object_string  [json_object_string
     *  [json_object]        [json_object]
     *  ...other fields...   ...other fields...
     *  c_string]            len
     *                       bytes
     *                       of
     *                       string
     *                       data
     *                       \0]
     */
    if (len > (SSIZE_T_MAX - (sizeof(*jso) - sizeof(jso->c_string)) - 1))
        return NULL;
    objsize = (sizeof(*jso) - sizeof(jso->c_string)) + len + 1;
    if (len < sizeof(void *))
        // We need a minimum size to support json_object_set_string() mutability
        // so we can stuff a pointer into pdata :(
        objsize += sizeof(void *) - len;

    jso = (struct json_object_string *)json_object_new(json_type_string, objsize,
                                                       &json_object_string_to_json_string);

    if (!jso)
        return NULL;
    jso->len = len;
    memcpy(jso->c_string.idata, s, len);
    // Cast below needed for Clang UB sanitizer
    ((char *)jso->c_string.idata)[len] = '\0';
    return &jso->base;
}

struct json_object *json_object_new_string(const char *s)
{
    return _json_object_new_string(s, strlen(s));
}

struct json_object *json_object_new_string_len(const char *s, const size_t len)
{
    return _json_object_new_string(s, len);
}

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);
    }
}

static inline ssize_t _json_object_get_string_len(const struct json_object_string *jso)
{
    ssize_t len;
    len = jso->len;
    return (len < 0) ? -(ssize_t)len : len;
}
size_t json_object_get_string_len(const struct json_object *jso)
{
    if (!jso)
        return 0;
    switch (jso->o_type)
    {
    case json_type_string: return _json_object_get_string_len(JC_STRING_C(jso));
    default: return 0;
    }
}

static int _json_object_set_string_len(json_object *jso, const char *s, size_t len)
{
    char *dstbuf;
    ssize_t curlen;
    ssize_t newlen;
    if (jso == NULL || jso->o_type != json_type_string)
        return 0;

    if (len >= INT_MAX - 1)
        // jso->len is a signed ssize_t, so it can't hold the
        // full size_t range. json_object_get_string_len returns
        // length as int, cap length at INT_MAX.
        return 0;

    curlen = JC_STRING(jso)->len;
    if (curlen < 0) {
        if (len == 0) {
            free(JC_STRING(jso)->c_string.pdata);
            JC_STRING(jso)->len = curlen = 0;
        } else {
            curlen = -curlen;
        }
    }

    newlen = len;
    dstbuf = get_string_component_mutable(jso);

    if ((ssize_t)len > curlen)
    {
        // We have no way to return the new ptr from realloc(jso, newlen)
        // and we have no way of knowing whether there's extra room available
        // so we need to stuff a pointer in to pdata :(
        dstbuf = (char *)malloc(len + 1);
        if (dstbuf == NULL)
            return 0;
        if (JC_STRING(jso)->len < 0)
            free(JC_STRING(jso)->c_string.pdata);
        JC_STRING(jso)->c_string.pdata = dstbuf;
        newlen = -(ssize_t)len;
    }
    else if (JC_STRING(jso)->len < 0)
    {
        // We've got enough room in the separate allocated buffer,
        // so use it as-is and continue to indicate that pdata is used.
        newlen = -(ssize_t)len;
    }

    memcpy(dstbuf, (const void *)s, len);
    dstbuf[len] = '\0';
    JC_STRING(jso)->len = newlen;
    return 1;
}

int json_object_set_string(json_object *jso, const char *s)
{
    return _json_object_set_string_len(jso, s, strlen(s));
}

int json_object_set_string_len(json_object *jso, const char *s, int len)
{
    return _json_object_set_string_len(jso, s, len);
}

/* json_object_array */

static size_t 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, "[");
    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 && !(flags & JSON_C_TO_STRING_PRETTY))
            printbuf_strappend(pb, " ");
        indent(pb, level + 1, flags);
        val = json_object_array_get_idx(jso, ii);
        if (val == NULL) {

            if (flags & JSON_C_TO_STRING_COLOR)
                printbuf_strappend(pb, ANSI_COLOR_FG_MAGENTA);
            printbuf_strappend(pb, "null");
            if (flags & JSON_C_TO_STRING_COLOR)
                printbuf_strappend(pb, ANSI_COLOR_RESET);

        } else if (val->_to_json_string(val, pb, level + 1, flags) < 0)
            return -1;
    }
    if ((flags & JSON_C_TO_STRING_PRETTY) && had_children)
    {
        printbuf_strappend(pb, "\n");
        indent(pb, level, flags);
    }

    if (flags & JSON_C_TO_STRING_SPACED && !(flags & JSON_C_TO_STRING_PRETTY))
        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(JC_ARRAY(jso)->c_array);
    json_object_generic_delete(jso);
}

struct json_object *json_object_new_array(void)
{
    return json_object_new_array_ext(ARRAY_LIST_DEFAULT_SIZE);
}
struct json_object *json_object_new_array_ext(int initial_size)
{
    struct json_object_array *jso = JSON_OBJECT_NEW(array);
    if (!jso)
        return NULL;
    jso->c_array = array_list_new2(&json_object_array_entry_free, initial_size);
    if (jso->c_array == NULL)
    {
        free(jso);
        return NULL;
    }
    return &jso->base;
}

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 JC_ARRAY_C(jso)->c_array;
    default: return NULL;
    }
}

void json_object_array_sort(struct json_object *jso, int (__cdecl* sort_fn)(const void *, const void *))
{
    assert(json_object_get_type(jso) == json_type_array);
    array_list_sort(JC_ARRAY(jso)->c_array, sort_fn);
}

struct json_object *json_object_array_bsearch(const struct json_object *key,
                                              const struct json_object *jso,
                                              int (__cdecl* 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,
                                                       JC_ARRAY_C(jso)->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(JC_ARRAY_C(jso)->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(JC_ARRAY(jso)->c_array, val);
}

int json_object_array_insert_idx(struct json_object *jso, size_t idx, struct json_object *val)
{
    assert(json_object_get_type(jso) == json_type_array);
    return array_list_insert_idx(JC_ARRAY(jso)->c_array, idx, 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(JC_ARRAY(jso)->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(JC_ARRAY(jso)->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(JC_ARRAY_C(jso)->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;
}

int json_object_array_shrink(struct json_object *jso, int empty_slots)
{
    if (empty_slots < 0)
        json_abort("json_object_array_shrink called with negative empty_slots");
    return array_list_shrink(JC_ARRAY(jso)->c_array, empty_slots);
}

struct json_object *json_object_new_null(void)
{
    return NULL;
}

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(JC_OBJECT(jso2)->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(JC_OBJECT(jso1)->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 (JC_BOOL(jso1)->c_boolean == JC_BOOL(jso2)->c_boolean);

    case json_type_double: return (JC_DOUBLE(jso1)->c_double == JC_DOUBLE(jso2)->c_double);

    case json_type_int:
    {
        struct json_object_int *int1 = JC_INT(jso1);
        struct json_object_int *int2 = JC_INT(jso2);
        if (int1->cint_type == json_object_int_type_int64)
        {
            if (int2->cint_type == json_object_int_type_int64)
                return (int1->cint.c_int64 == int2->cint.c_int64);
            if (int1->cint.c_int64 < 0)
                return 0;
            return ((uint64_t)int1->cint.c_int64 == int2->cint.c_uint64);
        }
        // else jso1 is a uint64
        if (int2->cint_type == json_object_int_type_uint64)
            return (int1->cint.c_uint64 == int2->cint.c_uint64);
        if (int2->cint.c_int64 < 0)
            return 0;
        return (int1->cint.c_uint64 == (uint64_t)int2->cint.c_int64);
    }

    case json_type_string:
    {
        return (_json_object_get_string_len(JC_STRING(jso1)) ==
                    _json_object_get_string_len(JC_STRING(jso2)) &&
                memcmp(get_string_component(jso1), get_string_component(jso2),
                       _json_object_get_string_len(JC_STRING(jso1))) == 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->_to_json_string == _json_object_userdata_to_json_string)
    {
        char *p;
        assert(src->_userdata);
        p = _strdup(src->_userdata);
        if (p == NULL)
        {
            _json_c_set_last_err("json_object_copy_serializer_data: out of memory\n");
            return -1;
        }
        dst->_userdata = p;
    }
    // else if ... other supported serializers ...
    else
    {
        _json_c_set_last_err(
            "json_object_copy_serializer_data: unable to copy unknown serializer data: "
            "%p\n", (void *)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(JC_BOOL(src)->c_boolean); break;

    case json_type_double: *dst = json_object_new_double(JC_DOUBLE(src)->c_double); break;

    case json_type_int:
        switch (JC_INT(src)->cint_type)
        {
        case json_object_int_type_int64:
            *dst = json_object_new_int64(JC_INT(src)->cint.c_int64);
            break;
        case json_object_int_type_uint64:
            *dst = json_object_new_uint64(JC_INT(src)->cint.c_uint64);
            break;
        default: json_abort("invalid cint_type");
        }
        break;

    case json_type_string:
        *dst = json_object_new_string_len(get_string_component(src),
                                          _json_object_get_string_len(JC_STRING(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, UINT_MAX,
                                                     &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, UINT_MAX, dst, shallow_copy);
    if (rc < 0)
    {
        json_object_put(*dst);
        *dst = NULL;
    }

    return rc;
}

static void json_abort(const char *message)
{
    if (message != NULL)
        fprintf(stderr, "json-c aborts with error: %s\n", message);
    abort();
}
