/src/json-c/json_object.c

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/*
 * 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 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, "{" /*}*/);
  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 int json_object_boolean_to_json_string(struct json_object *jso, struct printbuf *pb,
                                              int level, int flags)
{
  int 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 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];
  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 int 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;
  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(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 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_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 int _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);
}

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 JC_DOUBLE_C(jso)->c_double;
  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;
    case json_object_int_type_uint64: return 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 int 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 int 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;
}
int 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 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, "[");
  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 (*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 (*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();
}

Coverage Report

Created: 2024-07-23 06:12