Subversion Repositories ESP8266_P1_Meter

/*

  Copyright (c) 2009-2017 Dave Gamble and cJSON contributors

  Permission is hereby granted, free of charge, to any person obtaining a copy

  of this software and associated documentation files (the "Software"), to deal

  in the Software without restriction, including without limitation the rights

  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

  copies of the Software, and to permit persons to whom the Software is

  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in

  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

  THE SOFTWARE.

*/

/* cJSON */

/* JSON parser in C. */

/* disable warnings about old C89 functions in MSVC */

#if !defined(_CRT_SECURE_NO_DEPRECATE) && defined(_MSC_VER)

#define _CRT_SECURE_NO_DEPRECATE

#endif

#ifdef __GNUC__

#pragma GCC visibility push(default)

#endif

#if defined(_MSC_VER)

#pragma warning (push)

/* disable warning about single line comments in system headers */

#pragma warning (disable : 4001)

#endif

#include <string.h>

#include <stdio.h>

#include <math.h>

#include <stdlib.h>

#include <limits.h>

#include <ctype.h>

#include <float.h>

#ifdef ENABLE_LOCALES

#include <locale.h>

#endif

#if defined(_MSC_VER)

#pragma warning (pop)

#endif

#ifdef __GNUC__

#pragma GCC visibility pop

#endif

#include "cJSON.h"

/* define our own boolean type */

#ifdef true

#undef true

#endif

#define true ((cJSON_bool)1)

#ifdef false

#undef false

#endif

#define false ((cJSON_bool)0)

/* define isnan and isinf for ANSI C, if in C99 or above, isnan and isinf has been defined in math.h */

#ifndef isinf

#define isinf(d) (isnan((d - d)) && !isnan(d))

#endif

#ifndef isnan

#define isnan(d) (d != d)

#endif

#ifndef NAN

#ifdef _WIN32

#define NAN sqrt(-1.0)

#else

#define NAN 0.0/0.0

#endif

#endif

typedef struct {

    const unsigned char *json;

    size_t position;

} error;

static error global_error = { NULL, 0 };

CJSON_PUBLIC(const char *) cJSON_GetErrorPtr(void)

{

    return (const char*) (global_error.json + global_error.position);

}

CJSON_PUBLIC(char *) cJSON_GetStringValue(const cJSON * const item)

{

    if (!cJSON_IsString(item))

    {

        return NULL;

    }

    return item->valuestring;

}

CJSON_PUBLIC(double) cJSON_GetNumberValue(const cJSON * const item)

{

    if (!cJSON_IsNumber(item))

    {

        return (double) NAN;

    }

    return item->valuedouble;

}

/* This is a safeguard to prevent copy-pasters from using incompatible C and header files */

#if (CJSON_VERSION_MAJOR != 1) || (CJSON_VERSION_MINOR != 7) || (CJSON_VERSION_PATCH != 19)

    #error cJSON.h and cJSON.c have different versions. Make sure that both have the same.

#endif

CJSON_PUBLIC(const char*) cJSON_Version(void)

{

    static char version[15];

    sprintf(version, "%i.%i.%i", CJSON_VERSION_MAJOR, CJSON_VERSION_MINOR, CJSON_VERSION_PATCH);

    return version;

}

/* Case insensitive string comparison, doesn't consider two NULL pointers equal though */

static int case_insensitive_strcmp(const unsigned char *string1, const unsigned char *string2)

{

    if ((string1 == NULL) || (string2 == NULL))

    {

        return 1;

    }

    if (string1 == string2)

    {

        return 0;

    }

    for(; tolower(*string1) == tolower(*string2); (void)string1++, string2++)

    {

        if (*string1 == '\0')

        {

            return 0;

        }

    }

    return tolower(*string1) - tolower(*string2);

}

typedef struct internal_hooks

{

    void *(CJSON_CDECL *allocate)(size_t size);

    void (CJSON_CDECL *deallocate)(void *pointer);

    void *(CJSON_CDECL *reallocate)(void *pointer, size_t size);

} internal_hooks;

#if defined(_MSC_VER)

/* work around MSVC error C2322: '...' address of dllimport '...' is not static */

static void * CJSON_CDECL internal_malloc(size_t size)

{

    return malloc(size);

}

static void CJSON_CDECL internal_free(void *pointer)

{

    free(pointer);

}

static void * CJSON_CDECL internal_realloc(void *pointer, size_t size)

{

    return realloc(pointer, size);

}

#else

#define internal_malloc malloc

#define internal_free free

#define internal_realloc realloc

#endif

/* strlen of character literals resolved at compile time */

#define static_strlen(string_literal) (sizeof(string_literal) - sizeof(""))

static internal_hooks global_hooks = { internal_malloc, internal_free, internal_realloc };

static unsigned char* cJSON_strdup(const unsigned char* string, const internal_hooks * const hooks)

{

    size_t length = 0;

    unsigned char *copy = NULL;

    if (string == NULL)

    {

        return NULL;

    }

    length = strlen((const char*)string) + sizeof("");

    copy = (unsigned char*)hooks->allocate(length);

    if (copy == NULL)

    {

        return NULL;

    }

    memcpy(copy, string, length);

    return copy;

}

CJSON_PUBLIC(void) cJSON_InitHooks(cJSON_Hooks* hooks)

{

    if (hooks == NULL)

    {

        /* Reset hooks */

        global_hooks.allocate = malloc;

        global_hooks.deallocate = free;

        global_hooks.reallocate = realloc;

        return;

    }

    global_hooks.allocate = malloc;

    if (hooks->malloc_fn != NULL)

    {

        global_hooks.allocate = hooks->malloc_fn;

    }

    global_hooks.deallocate = free;

    if (hooks->free_fn != NULL)

    {

        global_hooks.deallocate = hooks->free_fn;

    }

    /* use realloc only if both free and malloc are used */

    global_hooks.reallocate = NULL;

    if ((global_hooks.allocate == malloc) && (global_hooks.deallocate == free))

    {

        global_hooks.reallocate = realloc;

    }

}

/* Internal constructor. */

static cJSON *cJSON_New_Item(const internal_hooks * const hooks)

{

    cJSON* node = (cJSON*)hooks->allocate(sizeof(cJSON));

    if (node)

    {

        memset(node, '\0', sizeof(cJSON));

    }

    return node;

}

/* Delete a cJSON structure. */

CJSON_PUBLIC(void) cJSON_Delete(cJSON *item)

{

    cJSON *next = NULL;

    while (item != NULL)

    {

        next = item->next;

        if (!(item->type & cJSON_IsReference) && (item->child != NULL))

        {

            cJSON_Delete(item->child);

        }

        if (!(item->type & cJSON_IsReference) && (item->valuestring != NULL))

        {

            global_hooks.deallocate(item->valuestring);

            item->valuestring = NULL;

        }

        if (!(item->type & cJSON_StringIsConst) && (item->string != NULL))

        {

            global_hooks.deallocate(item->string);

            item->string = NULL;

        }

        global_hooks.deallocate(item);

        item = next;

    }

}

/* get the decimal point character of the current locale */

static unsigned char get_decimal_point(void)

{

#ifdef ENABLE_LOCALES

    struct lconv *lconv = localeconv();

    return (unsigned char) lconv->decimal_point[0];

#else

    return '.';

#endif

}

typedef struct

{

    const unsigned char *content;

    size_t length;

    size_t offset;

    size_t depth; /* How deeply nested (in arrays/objects) is the input at the current offset. */

    internal_hooks hooks;

} parse_buffer;

/* check if the given size is left to read in a given parse buffer (starting with 1) */

#define can_read(buffer, size) ((buffer != NULL) && (((buffer)->offset + size) <= (buffer)->length))

/* check if the buffer can be accessed at the given index (starting with 0) */

#define can_access_at_index(buffer, index) ((buffer != NULL) && (((buffer)->offset + index) < (buffer)->length))

#define cannot_access_at_index(buffer, index) (!can_access_at_index(buffer, index))

/* get a pointer to the buffer at the position */

#define buffer_at_offset(buffer) ((buffer)->content + (buffer)->offset)

/* Parse the input text to generate a number, and populate the result into item. */

static cJSON_bool parse_number(cJSON * const item, parse_buffer * const input_buffer)

{

    double number = 0;

    unsigned char *after_end = NULL;

    unsigned char *number_c_string;

    unsigned char decimal_point = get_decimal_point();

    size_t i = 0;

    size_t number_string_length = 0;

    cJSON_bool has_decimal_point = false;

    if ((input_buffer == NULL) || (input_buffer->content == NULL))

    {

        return false;

    }

    /* copy the number into a temporary buffer and replace '.' with the decimal point

     * of the current locale (for strtod)

     * This also takes care of '\0' not necessarily being available for marking the end of the input */

    for (i = 0; can_access_at_index(input_buffer, i); i++)

    {

        switch (buffer_at_offset(input_buffer)[i])

        {

            case '0':

            case '1':

            case '2':

            case '3':

            case '4':

            case '5':

            case '6':

            case '7':

            case '8':

            case '9':

            case '+':

            case '-':

            case 'e':

            case 'E':

                number_string_length++;

                break;

            case '.':

                number_string_length++;

                has_decimal_point = true;

                break;

            default:

                goto loop_end;

        }

    }

loop_end:

    /* malloc for temporary buffer, add 1 for '\0' */

    number_c_string = (unsigned char *) input_buffer->hooks.allocate(number_string_length + 1);

    if (number_c_string == NULL)

    {

        return false; /* allocation failure */

    }

    memcpy(number_c_string, buffer_at_offset(input_buffer), number_string_length);

    number_c_string[number_string_length] = '\0';

    if (has_decimal_point)

    {

        for (i = 0; i < number_string_length; i++)

        {

            if (number_c_string[i] == '.')

            {

                /* replace '.' with the decimal point of the current locale (for strtod) */

                number_c_string[i] = decimal_point;

            }

        }

    }

    number = strtod((const char*)number_c_string, (char**)&after_end);

    if (number_c_string == after_end)

    {

        /* free the temporary buffer */

        input_buffer->hooks.deallocate(number_c_string);

        return false; /* parse_error */

    }

    item->valuedouble = number;

    /* use saturation in case of overflow */

    if (number >= INT_MAX)

    {

        item->valueint = INT_MAX;

    }

    else if (number <= (double)INT_MIN)

    {

        item->valueint = INT_MIN;

    }

    else

    {

        item->valueint = (int)number;

    }

    item->type = cJSON_Number;

    input_buffer->offset += (size_t)(after_end - number_c_string);

    /* free the temporary buffer */

    input_buffer->hooks.deallocate(number_c_string);

    return true;

}

/* don't ask me, but the original cJSON_SetNumberValue returns an integer or double */

CJSON_PUBLIC(double) cJSON_SetNumberHelper(cJSON *object, double number)

{

    if (number >= INT_MAX)

    {

        object->valueint = INT_MAX;

    }

    else if (number <= (double)INT_MIN)

    {

        object->valueint = INT_MIN;

    }

    else

    {

        object->valueint = (int)number;

    }

    return object->valuedouble = number;

}

/* Note: when passing a NULL valuestring, cJSON_SetValuestring treats this as an error and return NULL */

CJSON_PUBLIC(char*) cJSON_SetValuestring(cJSON *object, const char *valuestring)

{

    char *copy = NULL;

    size_t v1_len;

    size_t v2_len;

    /* if object's type is not cJSON_String or is cJSON_IsReference, it should not set valuestring */

    if ((object == NULL) || !(object->type & cJSON_String) || (object->type & cJSON_IsReference))

    {

        return NULL;

    }

    /* return NULL if the object is corrupted or valuestring is NULL */

    if (object->valuestring == NULL || valuestring == NULL)

    {

        return NULL;

    }

    v1_len = strlen(valuestring);

    v2_len = strlen(object->valuestring);

    if (v1_len <= v2_len)

    {

        /* strcpy does not handle overlapping string: [X1, X2] [Y1, Y2] => X2 < Y1 or Y2 < X1 */

        if (!( valuestring + v1_len < object->valuestring || object->valuestring + v2_len < valuestring ))

        {

            return NULL;

        }

        strcpy(object->valuestring, valuestring);

        return object->valuestring;

    }

    copy = (char*) cJSON_strdup((const unsigned char*)valuestring, &global_hooks);

    if (copy == NULL)

    {

        return NULL;

    }

    if (object->valuestring != NULL)

    {

        cJSON_free(object->valuestring);

    }

    object->valuestring = copy;

    return copy;

}

typedef struct

{

    unsigned char *buffer;

    size_t length;

    size_t offset;

    size_t depth; /* current nesting depth (for formatted printing) */

    cJSON_bool noalloc;

    cJSON_bool format; /* is this print a formatted print */

    internal_hooks hooks;

} printbuffer;

/* realloc printbuffer if necessary to have at least "needed" bytes more */

static unsigned char* ensure(printbuffer * const p, size_t needed)

{

    unsigned char *newbuffer = NULL;

    size_t newsize = 0;

    if ((p == NULL) || (p->buffer == NULL))

    {

        return NULL;

    }

    if ((p->length > 0) && (p->offset >= p->length))

    {

        /* make sure that offset is valid */

        return NULL;

    }

    if (needed > INT_MAX)

    {

        /* sizes bigger than INT_MAX are currently not supported */

        return NULL;

    }

    needed += p->offset + 1;

    if (needed <= p->length)

    {

        return p->buffer + p->offset;

    }

    if (p->noalloc) {

        return NULL;

    }

    /* calculate new buffer size */

    if (needed > (INT_MAX / 2))

    {

        /* overflow of int, use INT_MAX if possible */

        if (needed <= INT_MAX)

        {

            newsize = INT_MAX;

        }

        else

        {

            return NULL;

        }

    }

    else

    {

        newsize = needed * 2;

    }

    if (p->hooks.reallocate != NULL)

    {

        /* reallocate with realloc if available */

        newbuffer = (unsigned char*)p->hooks.reallocate(p->buffer, newsize);

        if (newbuffer == NULL)

        {

            p->hooks.deallocate(p->buffer);

            p->length = 0;

            p->buffer = NULL;

            return NULL;

        }

    }

    else

    {

        /* otherwise reallocate manually */

        newbuffer = (unsigned char*)p->hooks.allocate(newsize);

        if (!newbuffer)

        {

            p->hooks.deallocate(p->buffer);

            p->length = 0;

            p->buffer = NULL;

            return NULL;

        }

        memcpy(newbuffer, p->buffer, p->offset + 1);

        p->hooks.deallocate(p->buffer);

    }

    p->length = newsize;

    p->buffer = newbuffer;

    return newbuffer + p->offset;

}

/* calculate the new length of the string in a printbuffer and update the offset */

static void update_offset(printbuffer * const buffer)

{

    const unsigned char *buffer_pointer = NULL;

    if ((buffer == NULL) || (buffer->buffer == NULL))

    {

        return;

    }

    buffer_pointer = buffer->buffer + buffer->offset;

    buffer->offset += strlen((const char*)buffer_pointer);

}

/* securely comparison of floating-point variables */

static cJSON_bool compare_double(double a, double b)

{

    double maxVal = fabs(a) > fabs(b) ? fabs(a) : fabs(b);

    return (fabs(a - b) <= maxVal * DBL_EPSILON);

}

/* Render the number nicely from the given item into a string. */

static cJSON_bool print_number(const cJSON * const item, printbuffer * const output_buffer)

{

    unsigned char *output_pointer = NULL;

    double d = item->valuedouble;

    int length = 0;

    size_t i = 0;

    unsigned char number_buffer[26] = {0}; /* temporary buffer to print the number into */

    unsigned char decimal_point = get_decimal_point();

    double test = 0.0;

    if (output_buffer == NULL)

    {

        return false;

    }

    /* This checks for NaN and Infinity */

    if (isnan(d) || isinf(d))

    {

        length = sprintf((char*)number_buffer, "null");

    }

    else if(d == (double)item->valueint)

    {

        length = sprintf((char*)number_buffer, "%d", item->valueint);

    }

    else

    {

        /* Try 15 decimal places of precision to avoid nonsignificant nonzero digits */

        length = sprintf((char*)number_buffer, "%1.15g", d);

        /* Check whether the original double can be recovered */

        if ((sscanf((char*)number_buffer, "%lg", &test) != 1) || !compare_double((double)test, d))

        {

            /* If not, print with 17 decimal places of precision */

            length = sprintf((char*)number_buffer, "%1.17g", d);

        }

    }

    /* sprintf failed or buffer overrun occurred */

    if ((length < 0) || (length > (int)(sizeof(number_buffer) - 1)))

    {

        return false;

    }

    /* reserve appropriate space in the output */

    output_pointer = ensure(output_buffer, (size_t)length + sizeof(""));

    if (output_pointer == NULL)

    {

        return false;

    }

    /* copy the printed number to the output and replace locale

     * dependent decimal point with '.' */

    for (i = 0; i < ((size_t)length); i++)

    {

        if (number_buffer[i] == decimal_point)

        {

            output_pointer[i] = '.';

            continue;

        }

        output_pointer[i] = number_buffer[i];

    }

    output_pointer[i] = '\0';

    output_buffer->offset += (size_t)length;

    return true;

}

/* parse 4 digit hexadecimal number */

static unsigned parse_hex4(const unsigned char * const input)

{

    unsigned int h = 0;

    size_t i = 0;

    for (i = 0; i < 4; i++)

    {

        /* parse digit */

        if ((input[i] >= '0') && (input[i] <= '9'))

        {

            h += (unsigned int) input[i] - '0';

        }

        else if ((input[i] >= 'A') && (input[i] <= 'F'))

        {

            h += (unsigned int) 10 + input[i] - 'A';

        }

        else if ((input[i] >= 'a') && (input[i] <= 'f'))

        {

            h += (unsigned int) 10 + input[i] - 'a';

        }

        else /* invalid */

        {

            return 0;

        }

        if (i < 3)

        {

            /* shift left to make place for the next nibble */

            h = h << 4;

        }

    }

    return h;

}

/* converts a UTF-16 literal to UTF-8

 * A literal can be one or two sequences of the form \uXXXX */

static unsigned char utf16_literal_to_utf8(const unsigned char * const input_pointer, const unsigned char * const input_end, unsigned char **output_pointer)

{

    long unsigned int codepoint = 0;

    unsigned int first_code = 0;

    const unsigned char *first_sequence = input_pointer;

    unsigned char utf8_length = 0;

    unsigned char utf8_position = 0;

    unsigned char sequence_length = 0;

    unsigned char first_byte_mark = 0;

    if ((input_end - first_sequence) < 6)

    {

        /* input ends unexpectedly */

        goto fail;

    }

    /* get the first utf16 sequence */

    first_code = parse_hex4(first_sequence + 2);

    /* check that the code is valid */

    if (((first_code >= 0xDC00) && (first_code <= 0xDFFF)))

    {

        goto fail;

    }

    /* UTF16 surrogate pair */

    if ((first_code >= 0xD800) && (first_code <= 0xDBFF))

    {

        const unsigned char *second_sequence = first_sequence + 6;

        unsigned int second_code = 0;

        sequence_length = 12; /* \uXXXX\uXXXX */

        if ((input_end - second_sequence) < 6)

        {

            /* input ends unexpectedly */

            goto fail;

        }

        if ((second_sequence[0] != '\\') || (second_sequence[1] != 'u'))

        {

            /* missing second half of the surrogate pair */

            goto fail;

        }

        /* get the second utf16 sequence */

        second_code = parse_hex4(second_sequence + 2);

        /* check that the code is valid */

        if ((second_code < 0xDC00) || (second_code > 0xDFFF))

        {

            /* invalid second half of the surrogate pair */

            goto fail;

        }

        /* calculate the unicode codepoint from the surrogate pair */

        codepoint = 0x10000 + (((first_code & 0x3FF) << 10) | (second_code & 0x3FF));

    }

    else

    {

        sequence_length = 6; /* \uXXXX */

        codepoint = first_code;

    }

    /* encode as UTF-8

     * takes at maximum 4 bytes to encode:

     * 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */

    if (codepoint < 0x80)

    {

        /* normal ascii, encoding 0xxxxxxx */

        utf8_length = 1;

    }

    else if (codepoint < 0x800)

    {

        /* two bytes, encoding 110xxxxx 10xxxxxx */

        utf8_length = 2;

        first_byte_mark = 0xC0; /* 11000000 */

    }

    else if (codepoint < 0x10000)

    {

        /* three bytes, encoding 1110xxxx 10xxxxxx 10xxxxxx */

        utf8_length = 3;

        first_byte_mark = 0xE0; /* 11100000 */

    }

    else if (codepoint <= 0x10FFFF)

    {

        /* four bytes, encoding 1110xxxx 10xxxxxx 10xxxxxx 10xxxxxx */

        utf8_length = 4;

        first_byte_mark = 0xF0; /* 11110000 */

    }

    else

    {

        /* invalid unicode codepoint */

        goto fail;

    }

    /* encode as utf8 */

    for (utf8_position = (unsigned char)(utf8_length - 1); utf8_position > 0; utf8_position--)

    {

        /* 10xxxxxx */

        (*output_pointer)[utf8_position] = (unsigned char)((codepoint | 0x80) & 0xBF);

        codepoint >>= 6;

    }

    /* encode first byte */

    if (utf8_length > 1)

    {

        (*output_pointer)[0] = (unsigned char)((codepoint | first_byte_mark) & 0xFF);

    }

    else

    {

        (*output_pointer)[0] = (unsigned char)(codepoint & 0x7F);

    }

    *output_pointer += utf8_length;

    return sequence_length;

fail:

    return 0;

}

/* Parse the input text into an unescaped cinput, and populate item. */

static cJSON_bool parse_string(cJSON * const item, parse_buffer * const input_buffer)

{

    const unsigned char *input_pointer = buffer_at_offset(input_buffer) + 1;

    const unsigned char *input_end = buffer_at_offset(input_buffer) + 1;

    unsigned char *output_pointer = NULL;

    unsigned char *output = NULL;

    /* not a string */

    if (buffer_at_offset(input_buffer)[0] != '\"')

    {

        goto fail;

    }

    {

        /* calculate approximate size of the output (overestimate) */

        size_t allocation_length = 0;

        size_t skipped_bytes = 0;

        while (((size_t)(input_end - input_buffer->content) < input_buffer->length) && (*input_end != '\"'))

        {

            /* is escape sequence */

            if (input_end[0] == '\\')

            {

                if ((size_t)(input_end + 1 - input_buffer->content) >= input_buffer->length)

                {

                    /* prevent buffer overflow when last input character is a backslash */

                    goto fail;

                }

                skipped_bytes++;

                input_end++;

            }

            input_end++;

        }

        if (((size_t)(input_end - input_buffer->content) >= input_buffer->length) || (*input_end != '\"'))

        {

            goto fail; /* string ended unexpectedly */

        }

        /* This is at most how much we need for the output */

        allocation_length = (size_t) (input_end - buffer_at_offset(input_buffer)) - skipped_bytes;

        output = (unsigned char*)input_buffer->hooks.allocate(allocation_length + sizeof(""));

        if (output == NULL)

        {

            goto fail; /* allocation failure */

        }

    }

    output_pointer = output;

    /* loop through the string literal */

    while (input_pointer < input_end)

    {

        if (*input_pointer != '\\')

        {

            *output_pointer++ = *input_pointer++;

        }

        /* escape sequence */

        else

        {

            unsigned char sequence_length = 2;

            if ((input_end - input_pointer) < 1)

            {

                goto fail;

            }

            switch (input_pointer[1])

            {

                case 'b':

                    *output_pointer++ = '\b';

                    break;

                case 'f':

                    *output_pointer++ = '\f';

                    break;

                case 'n':

                    *output_pointer++ = '\n';

                    break;

                case 'r':

                    *output_pointer++ = '\r';

                    break;

                case 't':

                    *output_pointer++ = '\t';

                    break;

                case '\"':

                case '\\':

                case '/':

                    *output_pointer++ = input_pointer[1];

                    break;

                /* UTF-16 literal */

                case 'u':

                    sequence_length = utf16_literal_to_utf8(input_pointer, input_end, &output_pointer);

                    if (sequence_length == 0)

                    {

                        /* failed to convert UTF16-literal to UTF-8 */

                        goto fail;

                    }

                    break;

                default:

                    goto fail;

            }

            input_pointer += sequence_length;

        }

    }

    /* zero terminate the output */

    *output_pointer = '\0';

    item->type = cJSON_String;

    item->valuestring = (char*)output;

    input_buffer->offset = (size_t) (input_end - input_buffer->content);

    input_buffer->offset++;

    return true;

fail:

    if (output != NULL)

    {

        input_buffer->hooks.deallocate(output);

        output = NULL;

    }

    if (input_pointer != NULL)

    {

        input_buffer->offset = (size_t)(input_pointer - input_buffer->content);

    }

    return false;

}

/* Render the cstring provided to an escaped version that can be printed. */

static cJSON_bool print_string_ptr(const unsigned char * const input, printbuffer * const output_buffer)

{

    const unsigned char *input_pointer = NULL;

    unsigned char *output = NULL;

    unsigned char *output_pointer = NULL;

    size_t output_length = 0;

    /* numbers of additional characters needed for escaping */

    size_t escape_characters = 0;

    if (output_buffer == NULL)

    {

        return false;

    }

    /* empty string */

    if (input == NULL)

    {

        output = ensure(output_buffer, sizeof("\"\""));

        if (output == NULL)

        {

            return false;

        }

        strcpy((char*)output, "\"\"");

        return true;

    }

    /* set "flag" to 1 if something needs to be escaped */

    for (input_pointer = input; *input_pointer; input_pointer++)

    {

        switch (*input_pointer)

        {

            case '\"':

            case '\\':

            case '\b':

            case '\f':

            case '\n':

            case '\r':

            case '\t':

                /* one character escape sequence */

                escape_characters++;

                break;

            default:

                if (*input_pointer < 32)

                {

                    /* UTF-16 escape sequence uXXXX */

                    escape_characters += 5;

                }

                break;

        }

    }

    output_length = (size_t)(input_pointer - input) + escape_characters;

    output = ensure(output_buffer, output_length + sizeof("\"\""));

    if (output == NULL)

    {