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Makefile

@@ -0,0 +1,22 @@
+CC = gcc
+CFLAGS = -O2 -Wall -Wextra -std=gnu99
+LDFLAGS = -lcurl -lm
+
+TARGET = shadowclaw
+OBJS = shadowclaw.o cJSON.o
+
+all: $(TARGET)
+
+$(TARGET): $(OBJS)
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+clean:
+	rm -f $(OBJS) $(TARGET)
+
+strip: $(TARGET)
+	strip $(TARGET)
+
+.PHONY: all clean strip

cJSON.c

@@ -0,0 +1,3174 @@
+/*
+  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 != 18)
+    #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[64];
+    unsigned char decimal_point = get_decimal_point();
+    size_t i = 0;
+
+    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; (i < (sizeof(number_c_string) - 1)) && 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_c_string[i] = buffer_at_offset(input_buffer)[i];
+                break;
+
+            case '.':
+                number_c_string[i] = decimal_point;
+                break;
+
+            default:
+                goto loop_end;
+        }
+    }
+loop_end:
+    number_c_string[i] = '\0';
+
+    number = strtod((const char*)number_c_string, (char**)&after_end);
+    if (number_c_string == after_end)
+    {
+        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);
+    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;
+}
+
+CJSON_PUBLIC(char*) cJSON_SetValuestring(cJSON *object, const char *valuestring)
+{
+    char *copy = NULL;
+    /* 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 */
+    if (object->valuestring == NULL)
+    {
+        return NULL;
+    }
+    if (strlen(valuestring) <= strlen(object->valuestring))
+    {
+        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 p)
+{
+    const unsigned char *buffer = NULL;
+    if ((p == NULL) || (p->buffer == NULL))
+    {
+        return;
+    }
+    buffer = p->buffer + p->offset;
+
+    p->offset += strlen((const char*)buffer);
+}
+
+/* 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:
+     * 0 - 0x7F: 0xxxxxxx
+     * 0x80 - 0x7FF: 110xxxxx 10xxxxxx
+     * 0x800 - 0xFFFF: 1110xxxx 10xxxxxx 10xxxxxx
+     * 0x10000 - 0x10FFFF: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */
+
+    if (codepoint < 0x80)
+    {
+        /* one byte symbol */
+        utf8_length = 1;
+    }
+    else if (codepoint < 0x800)
+    {
+        /* two byte symbol  */
+        utf8_length = 2;
+    }
+    else if (codepoint < 0x10000)
+    {
+        /* three byte symbol */
+        utf8_length = 3;
+    }
+    else if (codepoint <= 0x10FFFF)
+    {
+        /* four byte symbol */
+        utf8_length = 4;
+    }
+    else
+    {
+        /* invalid unicode codepoint */
+        goto fail;
+    }
+
+    /* encode as utf8 */
+    switch (utf8_length)
+    {
+        case 1:
+            /* first byte */
+            (*output_pointer)[0] = (unsigned char)(codepoint);
+            break;
+        case 2:
+            first_byte_mark = 0xC0; /* 11000000 */
+            (*output_pointer)[0] = (unsigned char)(codepoint >> 6) | first_byte_mark;
+            (*output_pointer)[1] = (unsigned char)(codepoint & 0x3F) | 0x80;
+            break;
+        case 3:
+            first_byte_mark = 0xE0; /* 11100000 */
+            (*output_pointer)[0] = (unsigned char)(codepoint >> 12) | first_byte_mark;
+            (*output_pointer)[1] = (unsigned char)((codepoint >> 6) & 0x3F) | 0x80;
+            (*output_pointer)[2] = (unsigned char)(codepoint & 0x3F) | 0x80;
+            break;
+        case 4:
+            first_byte_mark = 0xF0; /* 11110000 */
+            (*output_pointer)[0] = (unsigned char)(codepoint >> 18) | first_byte_mark;
+            (*output_pointer)[1] = (unsigned char)((codepoint >> 12) & 0x3F) | 0x80;
+            (*output_pointer)[2] = (unsigned char)((codepoint >> 6) & 0x3F) | 0x80;
+            (*output_pointer)[3] = (unsigned char)(codepoint & 0x3F) | 0x80;
+            break;
+        default:
+            /* Should not execute */
+            goto fail;
+    }
+
+    utf8_position = utf8_length;
+    /* skip the \u characters */
+    sequence_length = (sequence_length > 0) ? sequence_length : 0;
+
+    *output_pointer += utf8_position;
+    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 UTF-16-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, "\"\"");
+
+        output_buffer->offset += 2;
+
+        return true;
+    }
+
+    /* calculate "escape" characters and final string length */
+    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 needed */
+                escape_characters++;
+                break;
+            default:
+                if (*input_pointer < 32)
+                {
+                    /* UTF-16 escape sequence \uXXXX should be printed */
+                    escape_characters += 5;
+                }
+                break;
+        }
+    }
+    output_length = (size_t)(input_pointer - input) + escape_characters;
+
+    output = ensure(output_buffer, output_length + sizeof("\"\""));
+    if (output == NULL)
+    {
+        return false;
+    }
+
+    /* no characters have to be escaped */
+    if (escape_characters == 0)
+    {
+        output[0] = '\"';
+        memcpy(output + 1, input, output_length);
+        output[output_length + 1] = '\"';
+        output[output_length + 2] = '\0';
+
+        output_buffer->offset += output_length + 2;
+
+        return true;
+    }
+
+    output[0] = '\"';
+    output_pointer = output + 1;
+    /* copy the string */
+    for (input_pointer = input; *input_pointer != '\0'; (void)input_pointer++, output_pointer++)
+    {
+        if ((*input_pointer > 31) && (*input_pointer != '\"') && (*input_pointer != '\\'))
+        {
+            /* normal character, copy */
+            *output_pointer = *input_pointer;
+        }
+        else
+        {
+            /* character needs to be escaped */
+            *output_pointer++ = '\\';
+            switch (*input_pointer)
+            {
+                case '\\':
+                    *output_pointer = '\\';
+                    break;
+                case '\"':
+                    *output_pointer = '\"';
+                    break;
+                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;
+                default:
+                    /* escape and print as unicode codepoint */
+                    sprintf((char*)output_pointer, "u%04x", *input_pointer);
+                    output_pointer += 4;
+                    break;
+            }
+        }
+    }
+    output[output_length + 1] = '\"';
+    output[output_length + 2] = '\0';
+
+    output_buffer->offset += output_length + 2;
+
+    return true;
+}
+
+/* Invoke print_string_ptr (which is useful) on an item. */
+static cJSON_bool print_string(const cJSON * const item, printbuffer * const p)
+{
+    return print_string_ptr((unsigned char*)item->valuestring, p);
+}
+
+/* Predeclare these prototypes. */
+static cJSON_bool parse_value(cJSON * const item, parse_buffer * const input_buffer);
+static cJSON_bool print_value(const cJSON * const item, printbuffer * const output_buffer);
+static cJSON_bool parse_array(cJSON * const item, parse_buffer * const input_buffer);
+static cJSON_bool print_array(const cJSON * const item, printbuffer * const output_buffer);
+static cJSON_bool parse_object(cJSON * const item, parse_buffer * const input_buffer);
+static cJSON_bool print_object(const cJSON * const item, printbuffer * const output_buffer);
+
+/* Utility to jump whitespace and cr/lf */
+static parse_buffer *buffer_skip_whitespace(parse_buffer * const buffer)
+{
+    if ((buffer == NULL) || (buffer->content == NULL))
+    {
+        return NULL;
+    }
+
+    if (cannot_access_at_index(buffer, 0))
+    {
+        return buffer;
+    }
+
+    while (can_access_at_index(buffer, 0) && (buffer_at_offset(buffer)[0] <= 32))
+    {
+       buffer->offset++;
+    }
+
+    if (buffer->offset == buffer->length)
+    {
+        buffer->offset--;
+    }
+
+    return buffer;
+}
+
+/* skip the UTF-8 BOM (byte order mark) if it is at the beginning of a buffer */
+static parse_buffer *skip_utf8_bom(parse_buffer * const buffer)
+{
+    if ((buffer == NULL) || (buffer->content == NULL) || (buffer->offset != 0))
+    {
+        return NULL;
+    }
+
+    if (can_access_at_index(buffer, 4) && (strncmp((const char*)buffer_at_offset(buffer), "\xEF\xBB\xBF", 3) == 0))
+    {
+        buffer->offset += 3;
+    }
+
+    return buffer;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithOpts(const char *value, const char **return_parse_end, cJSON_bool require_null_terminated)
+{
+    size_t buffer_length;
+
+    if (NULL == value)
+    {
+        return NULL;
+    }
+
+    /* Adding null character detection due to parse_parse_string and the way cJSON works */
+    buffer_length = strlen(value) + sizeof("");
+    return cJSON_ParseWithLengthOpts(value, buffer_length, return_parse_end, require_null_terminated);
+}
+
+/* Parse an object - create a new root, and populate. */
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithLengthOpts(const char *value, size_t buffer_length, const char **return_parse_end, cJSON_bool require_null_terminated)
+{
+    parse_buffer buffer = { 0, 0, 0, 0, { 0, 0, 0 } };
+    cJSON *item = NULL;
+
+    /* reset error position */
+    global_error.json = NULL;
+    global_error.position = 0;
+
+    if (value == NULL || 0 == buffer_length)
+    {
+        goto fail;
+    }
+
+    buffer.content = (const unsigned char*)value;
+    buffer.length = buffer_length;
+    buffer.offset = 0;
+    buffer.hooks = global_hooks;
+
+    item = cJSON_New_Item(&global_hooks);
+    if (item == NULL) /* memory fail */
+    {
+        goto fail;
+    }
+
+    if (!parse_value(item, buffer_skip_whitespace(skip_utf8_bom(&buffer))))
+    {
+        /* parse failure. ep is set. */
+        goto fail;
+    }
+
+    /* if we require null-terminated JSON without appended garbage, skip then and check for a null terminator */
+    if (require_null_terminated)
+    {
+        buffer_skip_whitespace(&buffer);
+        if ((buffer.offset >= buffer.length) || buffer_at_offset(&buffer)[0] != '\0')
+        {
+            goto fail;
+        }
+    }
+    if (return_parse_end)
+    {
+        *return_parse_end = (const char*)buffer_at_offset(&buffer);
+    }
+
+    return item;
+
+fail:
+    if (item != NULL)
+    {
+        cJSON_Delete(item);
+    }
+
+    if (value != NULL)
+    {
+        error local_error;
+        local_error.json = (const unsigned char*)value;
+        local_error.position = 0;
+
+        if (buffer.offset < buffer.length)
+        {
+            local_error.position = buffer.offset;
+        }
+        else if (buffer.length > 0)
+        {
+            local_error.position = buffer.length - 1;
+        }
+
+        if (return_parse_end != NULL)
+        {
+            *return_parse_end = (const char*)local_error.json + local_error.position;
+        }
+
+        global_error = local_error;
+    }
+
+    return NULL;
+}
+
+/* Default options for cJSON_Parse */
+CJSON_PUBLIC(cJSON *) cJSON_Parse(const char *value)
+{
+    return cJSON_ParseWithOpts(value, 0, 0);
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithLength(const char *value, size_t buffer_length)
+{
+    return cJSON_ParseWithLengthOpts(value, buffer_length, 0, 0);
+}
+
+#define cjson_min(a, b) (((a) < (b)) ? (a) : (b))
+
+static unsigned char *print(const cJSON * const item, cJSON_bool format, const internal_hooks * const hooks)
+{
+    static const size_t default_buffer_size = 256;
+    printbuffer buffer[1];
+    unsigned char *printed = NULL;
+
+    memset(buffer, 0, sizeof(buffer));
+
+    /* create buffer */
+    buffer->buffer = (unsigned char*) hooks->allocate(default_buffer_size);
+    buffer->length = default_buffer_size;
+    buffer->format = format;
+    buffer->hooks = *hooks;
+    if (buffer->buffer == NULL)
+    {
+        goto fail;
+    }
+
+    /* print the value */
+    if (!print_value(item, buffer))
+    {
+        goto fail;
+    }
+    update_offset(buffer);
+
+    /* check if reallocate is available */
+    if (hooks->reallocate != NULL)
+    {
+        printed = (unsigned char*) hooks->reallocate(buffer->buffer, buffer->offset + 1);
+        if (printed == NULL) {
+            goto fail;
+        }
+        buffer->buffer = NULL;
+    }
+    else /* otherwise copy the JSON over to a new buffer */
+    {
+        printed = (unsigned char*) hooks->allocate(buffer->offset + 1);
+        if (printed == NULL)
+        {
+            goto fail;
+        }
+        memcpy(printed, buffer->buffer, cjson_min(buffer->length, buffer->offset + 1));
+        printed[buffer->offset] = '\0'; /* just to be sure */
+
+        /* free the buffer */
+        hooks->deallocate(buffer->buffer);
+        buffer->buffer = NULL;
+    }
+
+    return printed;
+
+fail:
+    if (buffer->buffer != NULL)
+    {
+        hooks->deallocate(buffer->buffer);
+        buffer->buffer = NULL;
+    }
+
+    if (printed != NULL)
+    {
+        hooks->deallocate(printed);
+        printed = NULL;
+    }
+
+    return NULL;
+}
+
+/* Render a cJSON item/entity/structure to text. */
+CJSON_PUBLIC(char *) cJSON_Print(const cJSON *item)
+{
+    return (char*)print(item, true, &global_hooks);
+}
+
+CJSON_PUBLIC(char *) cJSON_PrintUnformatted(const cJSON *item)
+{
+    return (char*)print(item, false, &global_hooks);
+}
+
+CJSON_PUBLIC(char *) cJSON_PrintBuffered(const cJSON *item, int prebuffer, cJSON_bool fmt)
+{
+    printbuffer p = { 0, 0, 0, 0, 0, 0, { 0, 0, 0 } };
+
+    if (prebuffer < 0)
+    {
+        return NULL;
+    }
+
+    p.buffer = (unsigned char*)global_hooks.allocate((size_t)prebuffer);
+    if (!p.buffer)
+    {
+        return NULL;
+    }
+
+    p.length = (size_t)prebuffer;
+    p.offset = 0;
+    p.noalloc = false;
+    p.format = fmt;
+    p.hooks = global_hooks;
+
+    if (!print_value(item, &p))
+    {
+        global_hooks.deallocate(p.buffer);
+        p.buffer = NULL;
+        return NULL;
+    }
+
+    update_offset(&p);
+
+    return (char*)p.buffer;
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_PrintPreallocated(cJSON *item, char *buffer, const int length, const cJSON_bool format)
+{
+    printbuffer p = { 0, 0, 0, 0, 0, 0, { 0, 0, 0 } };
+
+    if ((length < 0) || (buffer == NULL))
+    {
+        return false;
+    }
+
+    p.buffer = (unsigned char*)buffer;
+    p.length = (size_t)length;
+    p.offset = 0;
+    p.noalloc = true;
+    p.format = format;
+    p.hooks = global_hooks;
+
+    return print_value(item, &p);
+}
+
+/* Parser core - when encountering text, process appropriately. */
+static cJSON_bool parse_value(cJSON * const item, parse_buffer * const input_buffer)
+{
+    if ((input_buffer == NULL) || (input_buffer->content == NULL))
+    {
+        return false; /* no input */
+    }
+
+    /* parse the different types of values */
+    /* null */
+    if (can_read(input_buffer, 4) && (strncmp((const char*)buffer_at_offset(input_buffer), "null", 4) == 0))
+    {
+        item->type = cJSON_NULL;
+        input_buffer->offset += 4;
+        return true;
+    }
+    /* false */
+    if (can_read(input_buffer, 5) && (strncmp((const char*)buffer_at_offset(input_buffer), "false", 5) == 0))
+    {
+        item->type = cJSON_False;
+        input_buffer->offset += 5;
+        return true;
+    }
+    /* true */
+    if (can_read(input_buffer, 4) && (strncmp((const char*)buffer_at_offset(input_buffer), "true", 4) == 0))
+    {
+        item->type = cJSON_True;
+        item->valueint = 1;
+        input_buffer->offset += 4;
+        return true;
+    }
+    /* string */
+    if (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == '\"'))
+    {
+        return parse_string(item, input_buffer);
+    }
+    /* number */
+    if (can_access_at_index(input_buffer, 0) && ((buffer_at_offset(input_buffer)[0] == '-') || ((buffer_at_offset(input_buffer)[0] >= '0') && (buffer_at_offset(input_buffer)[0] <= '9'))))
+    {
+        return parse_number(item, input_buffer);
+    }
+    /* array */
+    if (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == '['))
+    {
+        return parse_array(item, input_buffer);
+    }
+    /* object */
+    if (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == '{'))
+    {
+        return parse_object(item, input_buffer);
+    }
+
+    return false;
+}
+
+/* Render a value to text. */
+static cJSON_bool print_value(const cJSON * const item, printbuffer * const output_buffer)
+{
+    unsigned char *output = NULL;
+
+    if ((item == NULL) || (output_buffer == NULL))
+    {
+        return false;
+    }
+
+    switch ((item->type) & 0xFF)
+    {
+        case cJSON_NULL:
+            output = ensure(output_buffer, 5);
+            if (output == NULL)
+            {
+                return false;
+            }
+            strcpy((char*)output, "null");
+            output_buffer->offset += 4;
+            return true;
+
+        case cJSON_False:
+            output = ensure(output_buffer, 6);
+            if (output == NULL)
+            {
+                return false;
+            }
+            strcpy((char*)output, "false");
+            output_buffer->offset += 5;
+            return true;
+
+        case cJSON_True:
+            output = ensure(output_buffer, 5);
+            if (output == NULL)
+            {
+                return false;
+            }
+            strcpy((char*)output, "true");
+            output_buffer->offset += 4;
+            return true;
+
+        case cJSON_Number:
+            return print_number(item, output_buffer);
+
+        case cJSON_Raw:
+        {
+            size_t raw_length = 0;
+            if (item->valuestring == NULL)
+            {
+                return false;
+            }
+
+            raw_length = strlen(item->valuestring) + sizeof("");
+            output = ensure(output_buffer, raw_length);
+            if (output == NULL)
+            {
+                return false;
+            }
+            memcpy(output, item->valuestring, raw_length);
+            output_buffer->offset += raw_length - 1;
+            return true;
+        }
+
+        case cJSON_String:
+            return print_string(item, output_buffer);
+
+        case cJSON_Array:
+            return print_array(item, output_buffer);
+
+        case cJSON_Object:
+            return print_object(item, output_buffer);
+
+        default:
+            return false;
+    }
+}
+
+/* Build an array from input text. */
+static cJSON_bool parse_array(cJSON * const item, parse_buffer * const input_buffer)
+{
+    cJSON *head = NULL; /* head of the linked list */
+    cJSON *current_item = NULL;
+
+    if (input_buffer->depth >= CJSON_NESTING_LIMIT)
+    {
+        return false; /* to deeply nested */
+    }
+    input_buffer->depth++;
+
+    if (buffer_at_offset(input_buffer)[0] != '[')
+    {
+        /* not an array */
+        goto fail;
+    }
+
+    input_buffer->offset++;
+    buffer_skip_whitespace(input_buffer);
+    if (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == ']'))
+    {
+        /* empty array */
+        goto success;
+    }
+
+    /* check if we skipped to the end of the buffer */
+    if (cannot_access_at_index(input_buffer, 0))
+    {
+        input_buffer->offset--;
+        goto fail;
+    }
+
+    /* step back to character in front of the first element */
+    input_buffer->offset--;
+    /* loop through the comma separated array elements */
+    do
+    {
+        /* allocate next item */
+        cJSON *new_item = cJSON_New_Item(&(input_buffer->hooks));
+        if (new_item == NULL)
+        {
+            goto fail; /* allocation failure */
+        }
+
+        /* attach next item to list */
+        if (head == NULL)
+        {
+            /* start the linked list */
+            current_item = head = new_item;
+        }
+        else
+        {
+            /* add to the end and advance */
+            current_item->next = new_item;
+            new_item->prev = current_item;
+            current_item = new_item;
+        }
+
+        /* parse next value */
+        input_buffer->offset++;
+        buffer_skip_whitespace(input_buffer);
+        if (!parse_value(current_item, input_buffer))
+        {
+            goto fail; /* failed to parse value */
+        }
+        buffer_skip_whitespace(input_buffer);
+    }
+    while (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == ','));
+
+    if (cannot_access_at_index(input_buffer, 0) || buffer_at_offset(input_buffer)[0] != ']')
+    {
+        goto fail; /* expected end of array */
+    }
+
+success:
+    input_buffer->depth--;
+
+    if (head != NULL) {
+        head->prev = current_item;
+    }
+
+    item->type = cJSON_Array;
+    item->child = head;
+
+    input_buffer->offset++;
+
+    return true;
+
+fail:
+    if (head != NULL)
+    {
+        cJSON_Delete(head);
+    }
+
+    return false;
+}
+
+/* Render an array to text */
+static cJSON_bool print_array(const cJSON * const item, printbuffer * const output_buffer)
+{
+    unsigned char *output_pointer = NULL;
+    size_t length = 0;
+    cJSON *current_element = item->child;
+
+    if (output_buffer == NULL)
+    {
+        return false;
+    }
+
+    /* Compose the output array. */
+    /* opening square bracket */
+    output_pointer = ensure(output_buffer, 1);
+    if (output_pointer == NULL)
+    {
+        return false;
+    }
+
+    *output_pointer = '[';
+    output_buffer->offset++;
+    output_buffer->depth++;
+
+    while (current_element != NULL)
+    {
+        if (!print_value(current_element, output_buffer))
+        {
+            return false;
+        }
+        update_offset(output_buffer);
+        if (current_element->next)
+        {
+            length = (size_t) (output_buffer->format ? 2 : 1);
+            output_pointer = ensure(output_buffer, length + 1);
+            if (output_pointer == NULL)
+            {
+                return false;
+            }
+            *output_pointer++ = ',';
+            if(output_buffer->format)
+            {
+                *output_pointer++ = ' ';
+            }
+            *output_pointer = '\0';
+            output_buffer->offset += length;
+        }
+        current_element = current_element->next;
+    }
+
+    output_pointer = ensure(output_buffer, 2);
+    if (output_pointer == NULL)
+    {
+        return false;
+    }
+    *output_pointer++ = ']';
+    *output_pointer = '\0';
+    output_buffer->depth--;
+
+    return true;
+}
+
+/* Build an object from the text. */
+static cJSON_bool parse_object(cJSON * const item, parse_buffer * const input_buffer)
+{
+    cJSON *head = NULL; /* linked list head */
+    cJSON *current_item = NULL;
+
+    if (input_buffer->depth >= CJSON_NESTING_LIMIT)
+    {
+        return false; /* to deeply nested */
+    }
+    input_buffer->depth++;
+
+    if (cannot_access_at_index(input_buffer, 0) || (buffer_at_offset(input_buffer)[0] != '{'))
+    {
+        goto fail; /* not an object */
+    }
+
+    input_buffer->offset++;
+    buffer_skip_whitespace(input_buffer);
+    if (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == '}'))
+    {
+        goto success; /* empty object */
+    }
+
+    /* check if we skipped to the end of the buffer */
+    if (cannot_access_at_index(input_buffer, 0))
+    {
+        input_buffer->offset--;
+        goto fail;
+    }
+
+    /* step back to character in front of the first element */
+    input_buffer->offset--;
+    /* loop through the comma separated array elements */
+    do
+    {
+        /* allocate next item */
+        cJSON *new_item = cJSON_New_Item(&(input_buffer->hooks));
+        if (new_item == NULL)
+        {
+            goto fail; /* allocation failure */
+        }
+
+        /* attach next item to list */
+        if (head == NULL)
+        {
+            /* start the linked list */
+            current_item = head = new_item;
+        }
+        else
+        {
+            /* add to the end and advance */
+            current_item->next = new_item;
+            new_item->prev = current_item;
+            current_item = new_item;
+        }
+
+        if (cannot_access_at_index(input_buffer, 1))
+        {
+            goto fail; /* nothing comes after the comma */
+        }
+
+        /* parse the name of the child */
+        input_buffer->offset++;
+        buffer_skip_whitespace(input_buffer);
+        if (!parse_string(current_item, input_buffer))
+        {
+            goto fail; /* failed to parse name */
+        }
+        buffer_skip_whitespace(input_buffer);
+
+        /* swap valuestring and string, because we parsed the name */
+        current_item->string = current_item->valuestring;
+        current_item->valuestring = NULL;
+
+        if (cannot_access_at_index(input_buffer, 0) || (buffer_at_offset(input_buffer)[0] != ':'))
+        {
+            goto fail; /* invalid object */
+        }
+
+        /* parse the value */
+        input_buffer->offset++;
+        buffer_skip_whitespace(input_buffer);
+        if (!parse_value(current_item, input_buffer))
+        {
+            goto fail; /* failed to parse value */
+        }
+        buffer_skip_whitespace(input_buffer);
+    }
+    while (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == ','));
+
+    if (cannot_access_at_index(input_buffer, 0) || (buffer_at_offset(input_buffer)[0] != '}'))
+    {
+        goto fail; /* expected end of object */
+    }
+
+success:
+    input_buffer->depth--;
+
+    if (head != NULL) {
+        head->prev = current_item;
+    }
+
+    item->type = cJSON_Object;
+    item->child = head;
+
+    input_buffer->offset++;
+
+    return true;
+
+fail:
+    if (head != NULL)
+    {
+        cJSON_Delete(head);
+    }
+
+    return false;
+}
+
+/* Render an object to text. */
+static cJSON_bool print_object(const cJSON * const item, printbuffer * const output_buffer)
+{
+    unsigned char *output_pointer = NULL;
+    size_t length = 0;
+    cJSON *current_item = item->child;
+
+    if (output_buffer == NULL)
+    {
+        return false;
+    }
+
+    /* Compose the output: */
+    length = (size_t) (output_buffer->format ? 2 : 1); /* fmt: {\n */
+    output_pointer = ensure(output_buffer, length + 1);
+    if (output_pointer == NULL)
+    {
+        return false;
+    }
+
+    *output_pointer++ = '{';
+    output_buffer->depth++;
+    if (output_buffer->format)
+    {
+        *output_pointer++ = '\n';
+    }
+    output_buffer->offset += length;
+
+    while (current_item)
+    {
+        if (output_buffer->format)
+        {
+            size_t i;
+            output_pointer = ensure(output_buffer, output_buffer->depth);
+            if (output_pointer == NULL)
+            {
+                return false;
+            }
+            for (i = 0; i < output_buffer->depth; i++)
+            {
+                *output_pointer++ = '\t';
+            }
+            output_buffer->offset += output_buffer->depth;
+        }
+
+        /* print key */
+        if (!print_string_ptr((unsigned char*)current_item->string, output_buffer))
+        {
+            return false;
+        }
+        update_offset(output_buffer);
+
+        length = (size_t) (output_buffer->format ? 2 : 1);
+        output_pointer = ensure(output_buffer, length);
+        if (output_pointer == NULL)
+        {
+            return false;
+        }
+        *output_pointer++ = ':';
+        if (output_buffer->format)
+        {
+            *output_pointer++ = '\t';
+        }
+        output_buffer->offset += length;
+
+        /* print value */
+        if (!print_value(current_item, output_buffer))
+        {
+            return false;
+        }
+        update_offset(output_buffer);
+
+        /* print comma if not last */
+        length = ((size_t)(output_buffer->format ? 1 : 0) + (size_t)(current_item->next ? 1 : 0));
+        output_pointer = ensure(output_buffer, length + 1);
+        if (output_pointer == NULL)
+        {
+            return false;
+        }
+        if (current_item->next)
+        {
+            *output_pointer++ = ',';
+        }
+
+        if (output_buffer->format)
+        {
+            *output_pointer++ = '\n';
+        }
+        *output_pointer = '\0';
+        output_buffer->offset += length;
+
+        current_item = current_item->next;
+    }
+
+    output_pointer = ensure(output_buffer, output_buffer->format ? (output_buffer->depth + 1) : 2);
+    if (output_pointer == NULL)
+    {
+        return false;
+    }
+    if (output_buffer->format)
+    {
+        size_t i;
+        for (i = 0; i < (output_buffer->depth - 1); i++)
+        {
+            *output_pointer++ = '\t';
+        }
+    }
+    *output_pointer++ = '}';
+    *output_pointer = '\0';
+    output_buffer->depth--;
+
+    return true;
+}
+
+/* Get Array size/item / object item. */
+CJSON_PUBLIC(int) cJSON_GetArraySize(const cJSON *array)
+{
+    cJSON *child = NULL;
+    size_t size = 0;
+
+    if (array == NULL)
+    {
+        return 0;
+    }
+
+    child = array->child;
+
+    while(child != NULL)
+    {
+        size++;
+        child = child->next;
+    }
+
+    /* FIXME: Can overflow here. Cannot be fixed without breaking the API */
+
+    return (int)size;
+}
+
+static cJSON* get_array_item(const cJSON *array, size_t index)
+{
+    cJSON *current_child = NULL;
+
+    if (array == NULL)
+    {
+        return NULL;
+    }
+
+    current_child = array->child;
+    while ((current_child != NULL) && (index > 0))
+    {
+        index--;
+        current_child = current_child->next;
+    }
+
+    return current_child;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_GetArrayItem(const cJSON *array, int index)
+{
+    if (index < 0)
+    {
+        return NULL;
+    }
+
+    return get_array_item(array, (size_t)index);
+}
+
+static cJSON *get_object_item(const cJSON * const object, const char * const name, const cJSON_bool case_sensitive)
+{
+    cJSON *current_element = NULL;
+
+    if ((object == NULL) || (name == NULL))
+    {
+        return NULL;
+    }
+
+    current_element = object->child;
+    if (case_sensitive)
+    {
+        while (current_element != NULL)
+        {
+            if (current_element->string && (strcmp(name, current_element->string) == 0))
+            {
+                return current_element;
+            }
+            current_element = current_element->next;
+        }
+    }
+    else
+    {
+        while (current_element != NULL)
+        {
+            if (current_element->string && (case_insensitive_strcmp((const unsigned char*)name, (const unsigned char*)(current_element->string)) == 0))
+            {
+                return current_element;
+            }
+            current_element = current_element->next;
+        }
+    }
+
+    return NULL;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_GetObjectItem(const cJSON * const object, const char * const string)
+{
+    return get_object_item(object, string, false);
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_GetObjectItemCaseSensitive(const cJSON * const object, const char * const string)
+{
+    return get_object_item(object, string, true);
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_HasObjectItem(const cJSON *object, const char *string)
+{
+    return cJSON_GetObjectItem(object, string) ? 1 : 0;
+}
+
+/* Utility for array list handling. */
+static void suffix_object(cJSON *prev, cJSON *item)
+{
+    prev->next = item;
+    item->prev = prev;
+}
+
+/* Utility for handling references. */
+static cJSON *create_reference(const cJSON *item, const internal_hooks * const hooks)
+{
+    cJSON *reference = NULL;
+    if (item == NULL)
+    {
+        return NULL;
+    }
+
+    reference = cJSON_New_Item(hooks);
+    if (reference == NULL)
+    {
+        return NULL;
+    }
+
+    memcpy(reference, item, sizeof(cJSON));
+    reference->string = NULL;
+    reference->type |= cJSON_IsReference;
+    reference->next = reference->prev = NULL;
+    return reference;
+}
+
+static cJSON_bool add_item_to_array(cJSON *array, cJSON *item)
+{
+    cJSON *child = NULL;
+
+    if ((item == NULL) || (array == NULL) || (array == item))
+    {
+        return false;
+    }
+
+    child = array->child;
+    /*
+     * To find the last item in array quickly, we use prev in array
+     */
+    if (child == NULL)
+    {
+        /* list is empty, start new one */
+        array->child = item;
+        item->prev = item;
+        item->next = NULL;
+    }
+    else
+    {
+        /* append to the end */
+        if (child->prev)
+        {
+            suffix_object(child->prev, item);
+            array->child->prev = item;
+        }
+    }
+
+    return true;
+}
+
+/* Add item to array/object. */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToArray(cJSON *array, cJSON *item)
+{
+    return add_item_to_array(array, item);
+}
+
+#if defined(__clang__) || (defined(__GNUC__)  && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ > 5))))
+    #pragma GCC diagnostic push
+#endif
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#endif
+/* helper function to cast away const */
+static void* cast_away_const(const void* string)
+{
+    return (void*)string;
+}
+#if defined(__clang__) || (defined(__GNUC__)  && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ > 5))))
+    #pragma GCC diagnostic pop
+#endif
+
+
+static cJSON_bool add_item_to_object(cJSON * const object, const char * const string, cJSON * const item, const internal_hooks * const hooks, const cJSON_bool constant_key)
+{
+    char *new_key = NULL;
+    int new_type = cJSON_Invalid;
+
+    if ((object == NULL) || (string == NULL) || (item == NULL) || (object == item))
+    {
+        return false;
+    }
+
+    if (constant_key)
+    {
+        new_key = (char*)cast_away_const(string);
+        new_type = item->type | cJSON_StringIsConst;
+    }
+    else
+    {
+        new_key = (char*)cJSON_strdup((const unsigned char*)string, hooks);
+        if (new_key == NULL)
+        {
+            return false;
+        }
+
+        new_type = item->type & ~cJSON_StringIsConst;
+    }
+
+    if (!(item->type & cJSON_StringIsConst) && (item->string != NULL))
+    {
+        hooks->deallocate(item->string);
+    }
+
+    item->string = new_key;
+    item->type = new_type;
+
+    return add_item_to_array(object, item);
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObject(cJSON *object, const char *string, cJSON *item)
+{
+    return add_item_to_object(object, string, item, &global_hooks, false);
+}
+
+/* Add an item to an object with constant string as key */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObjectCS(cJSON *object, const char *string, cJSON *item)
+{
+    return add_item_to_object(object, string, item, &global_hooks, true);
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item)
+{
+    if (array == NULL)
+    {
+        return false;
+    }
+
+    return add_item_to_array(array, create_reference(item, &global_hooks));
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToObject(cJSON *object, const char *string, cJSON *item)
+{
+    if ((object == NULL) || (string == NULL))
+    {
+        return false;
+    }
+
+    return add_item_to_object(object, string, create_reference(item, &global_hooks), &global_hooks, false);
+}
+
+CJSON_PUBLIC(cJSON*) cJSON_AddNullToObject(cJSON * const object, const char * const name)
+{
+    cJSON *null = cJSON_CreateNull();
+    if (add_item_to_object(object, name, null, &global_hooks, false))
+    {
+        return null;
+    }
+
+    cJSON_Delete(null);
+    return NULL;
+}
+
+CJSON_PUBLIC(cJSON*) cJSON_AddTrueToObject(cJSON * const object, const char * const name)
+{
+    cJSON *true_item = cJSON_CreateTrue();
+    if (add_item_to_object(object, name, true_item, &global_hooks, false))
+    {
+        return true_item;
+    }
+
+    cJSON_Delete(true_item);
+    return NULL;
+}
+
+CJSON_PUBLIC(cJSON*) cJSON_AddFalseToObject(cJSON * const object, const char * const name)
+{
+    cJSON *false_item = cJSON_CreateFalse();
+    if (add_item_to_object(object, name, false_item, &global_hooks, false))
+    {
+        return false_item;
+    }
+
+    cJSON_Delete(false_item);
+    return NULL;
+}
+
+CJSON_PUBLIC(cJSON*) cJSON_AddBoolToObject(cJSON * const object, const char * const name, const cJSON_bool boolean)
+{
+    cJSON *bool_item = cJSON_CreateBool(boolean);
+    if (add_item_to_object(object, name, bool_item, &global_hooks, false))
+    {
+        return bool_item;
+    }
+
+    cJSON_Delete(bool_item);
+    return NULL;
+}
+
+CJSON_PUBLIC(cJSON*) cJSON_AddNumberToObject(cJSON * const object, const char * const name, const double number)
+{
+    cJSON *number_item = cJSON_CreateNumber(number);
+    if (add_item_to_object(object, name, number_item, &global_hooks, false))
+    {
+        return number_item;
+    }
+
+    cJSON_Delete(number_item);
+    return NULL;
+}
+
+CJSON_PUBLIC(cJSON*) cJSON_AddStringToObject(cJSON * const object, const char * const name, const char * const string)
+{
+    cJSON *string_item = cJSON_CreateString(string);
+    if (add_item_to_object(object, name, string_item, &global_hooks, false))
+    {
+        return string_item;
+    }
+
+    cJSON_Delete(string_item);
+    return NULL;
+}
+
+CJSON_PUBLIC(cJSON*) cJSON_AddRawToObject(cJSON * const object, const char * const name, const char * const raw)
+{
+    cJSON *raw_item = cJSON_CreateRaw(raw);
+    if (add_item_to_object(object, name, raw_item, &global_hooks, false))
+    {
+        return raw_item;
+    }
+
+    cJSON_Delete(raw_item);
+    return NULL;
+}
+
+CJSON_PUBLIC(cJSON*) cJSON_AddObjectToObject(cJSON * const object, const char * const name)
+{
+    cJSON *object_item = cJSON_CreateObject();
+    if (add_item_to_object(object, name, object_item, &global_hooks, false))
+    {
+        return object_item;
+    }
+
+    cJSON_Delete(object_item);
+    return NULL;
+}
+
+CJSON_PUBLIC(cJSON*) cJSON_AddArrayToObject(cJSON * const object, const char * const name)
+{
+    cJSON *array = cJSON_CreateArray();
+    if (add_item_to_object(object, name, array, &global_hooks, false))
+    {
+        return array;
+    }
+
+    cJSON_Delete(array);
+    return NULL;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemViaPointer(cJSON *parent, cJSON * const item)
+{
+    if ((parent == NULL) || (item == NULL))
+    {
+        return NULL;
+    }
+
+    if (item != parent->child)
+    {
+        /* not the first element */
+        item->prev->next = item->next;
+    }
+    if (item->next != NULL)
+    {
+        /* not the last element */
+        item->next->prev = item->prev;
+    }
+
+    if (item == parent->child)
+    {
+        /* first element */
+        parent->child = item->next;
+    }
+    else if (item->next == NULL)
+    {
+        /* last element */
+        parent->child->prev = item->prev;
+    }
+
+    /* make sure the detached item doesn't point anywhere anymore */
+    item->prev = NULL;
+    item->next = NULL;
+
+    return item;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromArray(cJSON *array, int which)
+{
+    if (which < 0)
+    {
+        return NULL;
+    }
+
+    return cJSON_DetachItemViaPointer(array, get_array_item(array, (size_t)which));
+}
+
+CJSON_PUBLIC(void) cJSON_DeleteItemFromArray(cJSON *array, int which)
+{
+    cJSON_Delete(cJSON_DetachItemFromArray(array, which));
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObject(cJSON *object, const char *string)
+{
+    cJSON *to_detach = cJSON_GetObjectItem(object, string);
+
+    return cJSON_DetachItemViaPointer(object, to_detach);
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObjectCaseSensitive(cJSON *object, const char *string)
+{
+    cJSON *to_detach = cJSON_GetObjectItemCaseSensitive(object, string);
+
+    return cJSON_DetachItemViaPointer(object, to_detach);
+}
+
+CJSON_PUBLIC(void) cJSON_DeleteItemFromObject(cJSON *object, const char *string)
+{
+    cJSON_Delete(cJSON_DetachItemFromObject(object, string));
+}
+
+CJSON_PUBLIC(void) cJSON_DeleteItemFromObjectCaseSensitive(cJSON *object, const char *string)
+{
+    cJSON_Delete(cJSON_DetachItemFromObjectCaseSensitive(object, string));
+}
+
+/* Replace array/object items with new ones. */
+CJSON_PUBLIC(cJSON_bool) cJSON_InsertItemInArray(cJSON *array, int which, cJSON *newitem)
+{
+    cJSON *after_inserted = NULL;
+
+    if (which < 0 || newitem == NULL)
+    {
+        return false;
+    }
+
+    after_inserted = get_array_item(array, (size_t)which);
+    if (after_inserted == NULL)
+    {
+        return add_item_to_array(array, newitem);
+    }
+
+    if (after_inserted != array->child && after_inserted->prev == NULL) {
+        /* return false if after_inserted is a corrupted array item */
+        return false;
+    }
+
+    newitem->next = after_inserted;
+    newitem->prev = after_inserted->prev;
+    after_inserted->prev = newitem;
+    if (after_inserted == array->child)
+    {
+        array->child = newitem;
+    }
+    else
+    {
+        newitem->prev->next = newitem;
+    }
+    return true;
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemViaPointer(cJSON * const parent, cJSON * const item, cJSON * replacement)
+{
+    if ((parent == NULL) || (parent->child == NULL) || (replacement == NULL) || (item == NULL))
+    {
+        return false;
+    }
+
+    if (replacement == item)
+    {
+        return true;
+    }
+
+    replacement->next = item->next;
+    replacement->prev = item->prev;
+
+    if (replacement->next != NULL)
+    {
+        replacement->next->prev = replacement;
+    }
+    if (parent->child == item)
+    {
+        if (parent->child->prev == parent->child)
+        {
+            replacement->prev = replacement;
+        }
+        parent->child = replacement;
+    }
+    else
+    {   /*
+         * To find the last item in array quickly, we use prev in array.
+         * We can't modify the last item's prev pointer from pointer to pointer conversion.
+         */
+        if (replacement->prev != NULL)
+        {
+            replacement->prev->next = replacement;
+        }
+        if (replacement->next == NULL)
+        {
+            parent->child->prev = replacement;
+        }
+    }
+
+    item->next = NULL;
+    item->prev = NULL;
+    cJSON_Delete(item);
+
+    return true;
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInArray(cJSON *array, int which, cJSON *newitem)
+{
+    if (which < 0)
+    {
+        return false;
+    }
+
+    return cJSON_ReplaceItemViaPointer(array, get_array_item(array, (size_t)which), newitem);
+}
+
+static cJSON_bool replace_item_in_object(cJSON *object, const char *string, cJSON *replacement, cJSON_bool case_sensitive)
+{
+    if ((replacement == NULL) || (string == NULL))
+    {
+        return false;
+    }
+
+    /* replace the name in the replacement */
+    if (!(replacement->type & cJSON_StringIsConst) && (replacement->string != NULL))
+    {
+        cJSON_free(replacement->string);
+    }
+    replacement->string = (char*)cJSON_strdup((const unsigned char*)string, &global_hooks);
+    if (replacement->string == NULL)
+    {
+        return false;
+    }
+
+    replacement->type &= ~cJSON_StringIsConst;
+
+    return cJSON_ReplaceItemViaPointer(object, get_object_item(object, string, case_sensitive), replacement);
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObject(cJSON *object, const char *string, cJSON *newitem)
+{
+    return replace_item_in_object(object, string, newitem, false);
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObjectCaseSensitive(cJSON *object, const char *string, cJSON *newitem)
+{
+    return replace_item_in_object(object, string, newitem, true);
+}
+
+/* Create basic types: */
+CJSON_PUBLIC(cJSON *) cJSON_CreateNull(void)
+{
+    cJSON *item = cJSON_New_Item(&global_hooks);
+    if(item)
+    {
+        item->type = cJSON_NULL;
+    }
+
+    return item;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateTrue(void)
+{
+    cJSON *item = cJSON_New_Item(&global_hooks);
+    if(item)
+    {
+        item->type = cJSON_True;
+    }
+
+    return item;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateFalse(void)
+{
+    cJSON *item = cJSON_New_Item(&global_hooks);
+    if(item)
+    {
+        item->type = cJSON_False;
+    }
+
+    return item;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateBool(cJSON_bool boolean)
+{
+    cJSON *item = cJSON_New_Item(&global_hooks);
+    if(item)
+    {
+        item->type = boolean ? cJSON_True : cJSON_False;
+    }
+
+    return item;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateNumber(double num)
+{
+    cJSON *item = cJSON_New_Item(&global_hooks);
+    if(item)
+    {
+        item->type = cJSON_Number;
+        item->valuedouble = num;
+
+        /* use saturation in case of overflow */
+        if (num >= INT_MAX)
+        {
+            item->valueint = INT_MAX;
+        }
+        else if (num <= (double)INT_MIN)
+        {
+            item->valueint = INT_MIN;
+        }
+        else
+        {
+            item->valueint = (int)num;
+        }
+    }
+
+    return item;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateString(const char *string)
+{
+    cJSON *item = cJSON_New_Item(&global_hooks);
+    if(item)
+    {
+        item->type = cJSON_String;
+        item->valuestring = (char*)cJSON_strdup((const unsigned char*)string, &global_hooks);
+        if(!item->valuestring)
+        {
+            cJSON_Delete(item);
+            return NULL;
+        }
+    }
+
+    return item;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateStringReference(const char *string)
+{
+    cJSON *item = cJSON_New_Item(&global_hooks);
+    if (item != NULL)
+    {
+        item->type = cJSON_String | cJSON_IsReference;
+        item->valuestring = (char*)cast_away_const(string);
+    }
+
+    return item;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateObjectReference(const cJSON *child)
+{
+    cJSON *item = cJSON_New_Item(&global_hooks);
+    if (item != NULL) {
+        item->type = cJSON_Object | cJSON_IsReference;
+        item->child = (cJSON*)cast_away_const(child);
+    }
+
+    return item;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateArrayReference(const cJSON *child) {
+    cJSON *item = cJSON_New_Item(&global_hooks);
+    if (item != NULL) {
+        item->type = cJSON_Array | cJSON_IsReference;
+        item->child = (cJSON*)cast_away_const(child);
+    }
+
+    return item;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateRaw(const char *raw)
+{
+    cJSON *item = cJSON_New_Item(&global_hooks);
+    if(item)
+    {
+        item->type = cJSON_Raw;
+        item->valuestring = (char*)cJSON_strdup((const unsigned char*)raw, &global_hooks);
+        if(!item->valuestring)
+        {
+            cJSON_Delete(item);
+            return NULL;
+        }
+    }
+
+    return item;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateArray(void)
+{
+    cJSON *item = cJSON_New_Item(&global_hooks);
+    if(item)
+    {
+        item->type=cJSON_Array;
+    }
+
+    return item;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateObject(void)
+{
+    cJSON *item = cJSON_New_Item(&global_hooks);
+    if(item)
+    {
+        item->type = cJSON_Object;
+    }
+
+    return item;
+}
+
+/* Create Arrays: */
+CJSON_PUBLIC(cJSON *) cJSON_CreateIntArray(const int *numbers, int count)
+{
+    size_t i = 0;
+    cJSON *n = NULL;
+    cJSON *p = NULL;
+    cJSON *a = NULL;
+
+    if ((count < 0) || (numbers == NULL))
+    {
+        return NULL;
+    }
+
+    a = cJSON_CreateArray();
+
+    for(i = 0; a && (i < (size_t)count); i++)
+    {
+        n = cJSON_CreateNumber((double)numbers[i]);
+        if (!n)
+        {
+            cJSON_Delete(a);
+            return NULL;
+        }
+        if(!i)
+        {
+            a->child = n;
+        }
+        else
+        {
+            suffix_object(p, n);
+        }
+        p = n;
+    }
+
+    if (a && a->child) {
+        a->child->prev = n;
+    }
+
+    return a;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateFloatArray(const float *numbers, int count)
+{
+    size_t i = 0;
+    cJSON *n = NULL;
+    cJSON *p = NULL;
+    cJSON *a = NULL;
+
+    if ((count < 0) || (numbers == NULL))
+    {
+        return NULL;
+    }
+
+    a = cJSON_CreateArray();
+
+    for(i = 0; a && (i < (size_t)count); i++)
+    {
+        n = cJSON_CreateNumber((double)numbers[i]);
+        if(!n)
+        {
+            cJSON_Delete(a);
+            return NULL;
+        }
+        if(!i)
+        {
+            a->child = n;
+        }
+        else
+        {
+            suffix_object(p, n);
+        }
+        p = n;
+    }
+
+    if (a && a->child) {
+        a->child->prev = n;
+    }
+
+    return a;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateDoubleArray(const double *numbers, int count)
+{
+    size_t i = 0;
+    cJSON *n = NULL;
+    cJSON *p = NULL;
+    cJSON *a = NULL;
+
+    if ((count < 0) || (numbers == NULL))
+    {
+        return NULL;
+    }
+
+    a = cJSON_CreateArray();
+
+    for(i = 0; a && (i < (size_t)count); i++)
+    {
+        n = cJSON_CreateNumber(numbers[i]);
+        if(!n)
+        {
+            cJSON_Delete(a);
+            return NULL;
+        }
+        if(!i)
+        {
+            a->child = n;
+        }
+        else
+        {
+            suffix_object(p, n);
+        }
+        p = n;
+    }
+
+    if (a && a->child) {
+        a->child->prev = n;
+    }
+
+    return a;
+}
+
+CJSON_PUBLIC(cJSON *) cJSON_CreateStringArray(const char *const *strings, int count)
+{
+    size_t i = 0;
+    cJSON *n = NULL;
+    cJSON *p = NULL;
+    cJSON *a = NULL;
+
+    if ((count < 0) || (strings == NULL))
+    {
+        return NULL;
+    }
+
+    a = cJSON_CreateArray();
+
+    for(i = 0; a && (i < (size_t)count); i++)
+    {
+        n = cJSON_CreateString(strings[i]);
+        if(!n)
+        {
+            cJSON_Delete(a);
+            return NULL;
+        }
+        if(!i)
+        {
+            a->child = n;
+        }
+        else
+        {
+            suffix_object(p, n);
+        }
+        p = n;
+    }
+
+    if (a && a->child) {
+        a->child->prev = n;
+    }
+
+    return a;
+}
+
+/* Duplication */
+CJSON_PUBLIC(cJSON *) cJSON_Duplicate(const cJSON *item, cJSON_bool recurse)
+{
+    cJSON *newitem = NULL;
+    cJSON *child = NULL;
+    cJSON *next = NULL;
+    cJSON *newchild = NULL;
+
+    /* Bail on bad ptr */
+    if (!item)
+    {
+        goto fail;
+    }
+    /* Create new item */
+    newitem = cJSON_New_Item(&global_hooks);
+    if (!newitem)
+    {
+        goto fail;
+    }
+    /* Copy over all vars */
+    newitem->type = item->type & (~cJSON_IsReference);
+    newitem->valueint = item->valueint;
+    newitem->valuedouble = item->valuedouble;
+    if (item->valuestring)
+    {
+        newitem->valuestring = (char*)cJSON_strdup((unsigned char*)item->valuestring, &global_hooks);
+        if (!newitem->valuestring)
+        {
+            goto fail;
+        }
+    }
+    if (item->string)
+    {
+        newitem->string = (item->type&cJSON_StringIsConst) ? item->string : (char*)cJSON_strdup((unsigned char*)item->string, &global_hooks);
+        if (!newitem->string)
+        {
+            goto fail;
+        }
+    }
+    /* If non recurse, then we're done! */
+    if (!recurse)
+    {
+        return newitem;
+    }
+    /* Walk the ->next chain for the child. */
+    child = item->child;
+    while (child != NULL)
+    {
+        newchild = cJSON_Duplicate(child, true); /* Duplicate (with recurse) each item in the chain */
+        if (!newchild)
+        {
+            goto fail;
+        }
+        if (next != NULL)
+        {
+            /* If newitem->child already set, then crosswire ->prev and ->next and move on */
+            next->next = newchild;
+            newchild->prev = next;
+            next = newchild;
+        }
+        else
+        {
+            /* Set newitem->child and move to it */
+            newitem->child = newchild;
+            next = newchild;
+        }
+        child = child->next;
+    }
+    if (newitem && newitem->child)
+    {
+        newitem->child->prev = newchild;
+    }
+
+    return newitem;
+
+fail:
+    if (newitem != NULL)
+    {
+        cJSON_Delete(newitem);
+    }
+
+    return NULL;
+}
+
+static void skip_oneline_comment(char **input)
+{
+    *input += static_strlen("//");
+
+    for (; (*input)[0] != '\0'; ++(*input))
+    {
+        if ((*input)[0] == '\n') {
+            *input += static_strlen("\n");
+            return;
+        }
+    }
+}
+
+static void skip_multiline_comment(char **input)
+{
+    *input += static_strlen("/*");
+
+    for (; (*input)[0] != '\0'; ++(*input))
+    {
+        if (((*input)[0] == '*') && ((*input)[1] == '/'))
+        {
+            *input += static_strlen("*/");
+            return;
+        }
+    }
+}
+
+static void minify_string(char **input, char **output) {
+    (*output)[0] = (*input)[0];
+    *input += static_strlen("\"");
+    *output += static_strlen("\"");
+
+
+    for (; (*input)[0] != '\0'; (void)++(*input), ++(*output)) {
+        (*output)[0] = (*input)[0];
+
+        if ((*input)[0] == '\"') {
+            (*output)[0] = '\"';
+            *input += static_strlen("\"");
+            *output += static_strlen("\"");
+            return;
+        } else if (((*input)[0] == '\\') && ((*input)[1] == '\"')) {
+            (*output)[1] = (*input)[1];
+            *input += static_strlen("\"");
+            *output += static_strlen("\"");
+        }
+    }
+}
+
+CJSON_PUBLIC(void) cJSON_Minify(char *json)
+{
+    char *into = json;
+
+    if (json == NULL)
+    {
+        return;
+    }
+
+    while (json[0] != '\0')
+    {
+        switch (json[0])
+        {
+            case ' ':
+            case '\t':
+            case '\r':
+            case '\n':
+                json++;
+                break;
+
+            case '/':
+                if (json[1] == '/')
+                {
+                    skip_oneline_comment(&json);
+                }
+                else if (json[1] == '*')
+                {
+                    skip_multiline_comment(&json);
+                } else {
+                    json++;
+                }
+                break;
+
+            case '\"':
+                minify_string(&json, (char**)&into);
+                break;
+
+            default:
+                into[0] = json[0];
+                json++;
+                into++;
+        }
+    }
+
+    /* and null-terminate. */
+    *into = '\0';
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_IsInvalid(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_Invalid;
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_IsFalse(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_False;
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_IsTrue(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xff) == cJSON_True;
+}
+
+
+CJSON_PUBLIC(cJSON_bool) cJSON_IsBool(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & (cJSON_True | cJSON_False)) != 0;
+}
+CJSON_PUBLIC(cJSON_bool) cJSON_IsNull(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_NULL;
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_IsNumber(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_Number;
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_IsString(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_String;
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_IsArray(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_Array;
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_IsObject(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_Object;
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_IsRaw(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_Raw;
+}
+
+CJSON_PUBLIC(cJSON_bool) cJSON_Compare(const cJSON * const a, const cJSON * const b, const cJSON_bool case_sensitive)
+{
+    if ((a == NULL) || (b == NULL) || ((a->type & 0xFF) != (b->type & 0xFF)))
+    {
+        return false;
+    }
+
+    /* check if type is valid */
+    switch (a->type & 0xFF)
+    {
+        case cJSON_False:
+        case cJSON_True:
+        case cJSON_NULL:
+        case cJSON_Number:
+        case cJSON_String:
+        case cJSON_Raw:
+        case cJSON_Array:
+        case cJSON_Object:
+            break;
+
+        default:
+            return false;
+    }
+
+    /* identical objects are equal */
+    if (a == b)
+    {
+        return true;
+    }
+
+    switch (a->type & 0xFF)
+    {
+        /* in these cases and equal type is enough */
+        case cJSON_False:
+        case cJSON_True:
+        case cJSON_NULL:
+            return true;
+
+        case cJSON_Number:
+            if (compare_double(a->valuedouble, b->valuedouble))
+            {
+                return true;
+            }
+            return false;
+
+        case cJSON_String:
+        case cJSON_Raw:
+            if ((a->valuestring == NULL) || (b->valuestring == NULL))
+            {
+                return false;
+            }
+            if (strcmp(a->valuestring, b->valuestring) == 0)
+            {
+                return true;
+            }
+
+            return false;
+
+        case cJSON_Array:
+        {
+            cJSON *a_element = a->child;
+            cJSON *b_element = b->child;
+
+            for (; (a_element != NULL) && (b_element != NULL);)
+            {
+                if (!cJSON_Compare(a_element, b_element, case_sensitive))
+                {
+                    return false;
+                }
+
+                a_element = a_element->next;
+                b_element = b_element->next;
+            }
+
+            /* one of the arrays is longer than the other */
+            if (a_element != b_element) {
+                return false;
+            }
+
+            return true;
+        }
+
+        case cJSON_Object:
+        {
+            cJSON *a_element = NULL;
+            cJSON *b_element = NULL;
+            cJSON_ArrayForEach(a_element, a)
+            {
+                /* TODO This has O(n^2) runtime, which is horrible! */
+                b_element = get_object_item(b, a_element->string, case_sensitive);
+                if (b_element == NULL)
+                {
+                    return false;
+                }
+
+                if (!cJSON_Compare(a_element, b_element, case_sensitive))
+                {
+                    return false;
+                }
+            }
+
+            /* doing this twice, once on a and b to prevent true comparison if a subset of b
+             * TODO: Do this the proper way. */
+            cJSON_ArrayForEach(b_element, b)
+            {
+                a_element = get_object_item(a, b_element->string, case_sensitive);
+                if (a_element == NULL)
+                {
+                    return false;
+                }
+
+                if (!cJSON_Compare(b_element, a_element, case_sensitive))
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        default:
+            return false;
+    }
+}
+
+CJSON_PUBLIC(void *) cJSON_malloc(size_t size)
+{
+    return global_hooks.allocate(size);
+}
+
+CJSON_PUBLIC(void) cJSON_free(void *object)
+{
+    global_hooks.deallocate(object);
+}

cJSON.h

@@ -0,0 +1,290 @@
+/*
+  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.
+*/
+
+#ifndef cJSON__h
+#define cJSON__h
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#if !defined(__WINDOWS__) && (defined(WIN32) || defined(WIN64) || defined(_MSC_VER) || defined(_WIN32))
+#define __WINDOWS__
+#endif
+
+#ifdef __WINDOWS__
+
+/* When compiling for windows, we specify a specific calling convention to avoid issues where we are being called from a project with a different default calling convention.  For windows you have 3 define options:
+
+CJSON_HIDE_SYMBOLS - Define this in the case where you don't want to ever dllexport symbols
+CJSON_EXPORT_SYMBOLS - Define this on build when you want to dllexport symbols (default)
+CJSON_IMPORT_SYMBOLS - Define this if you want to dllimport symbol
+
+For *nix builds that support visibility attribute, you can define similar behavior by setting default visibility to hidden by adding
+-fvisibility=hidden (for gcc) or -xldscope=hidden (for sun cc) to CFLAGS
+then using the CJSON_API_VISIBILITY flag to "export" the same symbols the way CJSON_EXPORT_SYMBOLS does
+
+*/
+
+#define CJSON_CDECL __cdecl
+#define CJSON_STDCALL __stdcall
+
+/* export symbols by default, this is necessary for copy pasting the C and header file */
+#if !defined(CJSON_HIDE_SYMBOLS) && !defined(CJSON_IMPORT_SYMBOLS) && !defined(CJSON_EXPORT_SYMBOLS)
+#define CJSON_EXPORT_SYMBOLS
+#endif
+
+#if defined(CJSON_HIDE_SYMBOLS)
+#define CJSON_PUBLIC(type)   type CJSON_STDCALL
+#elif defined(CJSON_EXPORT_SYMBOLS)
+#define CJSON_PUBLIC(type)   __declspec(dllexport) type CJSON_STDCALL
+#elif defined(CJSON_IMPORT_SYMBOLS)
+#define CJSON_PUBLIC(type)   __declspec(dllimport) type CJSON_STDCALL
+#endif
+#else /* !__WINDOWS__ */
+#define CJSON_CDECL
+#define CJSON_STDCALL
+
+#if (defined(__GNUC__) || defined(__SUNPRO_CC) || defined (__SUNPRO_C)) && defined(CJSON_API_VISIBILITY)
+#define CJSON_PUBLIC(type)   __attribute__((visibility("default"))) type
+#else
+#define CJSON_PUBLIC(type) type
+#endif
+#endif
+
+/* project version */
+#define CJSON_VERSION_MAJOR 1
+#define CJSON_VERSION_MINOR 7
+#define CJSON_VERSION_PATCH 18
+
+#include <stddef.h>
+
+/* cJSON Types: */
+#define cJSON_Invalid (0)
+#define cJSON_False  (1 << 0)
+#define cJSON_True   (1 << 1)
+#define cJSON_NULL   (1 << 2)
+#define cJSON_Number (1 << 3)
+#define cJSON_String (1 << 4)
+#define cJSON_Array  (1 << 5)
+#define cJSON_Object (1 << 6)
+#define cJSON_Raw    (1 << 7) /* raw json */
+
+#define cJSON_IsReference 256
+#define cJSON_StringIsConst 512
+
+/* The cJSON structure: */
+typedef struct cJSON
+{
+    /* next/prev allow you to walk array/object chains. Alternatively, use GetArraySize/GetArrayItem/GetObjectItem */
+    struct cJSON *next;
+    struct cJSON *prev;
+    /* An array or object item will have a child pointer pointing to a chain of the items in the array/object. */
+    struct cJSON *child;
+
+    /* The type of the item, as above. */
+    int type;
+
+    /* The item's string, if type==cJSON_String  and type == cJSON_Raw */
+    char *valuestring;
+    /* writing to valueint is DEPRECATED, use cJSON_SetNumberValue instead */
+    int valueint;
+    /* The item's number, if type==cJSON_Number */
+    double valuedouble;
+
+    /* The item's name string, if this item is the child of, or is in the list of subitems of an object. */
+    char *string;
+} cJSON;
+
+typedef struct cJSON_Hooks
+{
+      /* malloc/free are CDECL on Windows regardless of the default calling convention of the compiler, so ensure the hooks allow passing those functions directly. */
+      void *(CJSON_CDECL *malloc_fn)(size_t sz);
+      void (CJSON_CDECL *free_fn)(void *ptr);
+} cJSON_Hooks;
+
+typedef int cJSON_bool;
+
+/* Limits how deeply nested arrays/objects can be before cJSON rejects to parse them.
+ * This is to prevent stack overflows. */
+#ifndef CJSON_NESTING_LIMIT
+#define CJSON_NESTING_LIMIT 1000
+#endif
+
+/* returns the version of cJSON as a string */
+CJSON_PUBLIC(const char*) cJSON_Version(void);
+
+/* Supply malloc, realloc and free functions to cJSON */
+CJSON_PUBLIC(void) cJSON_InitHooks(cJSON_Hooks* hooks);
+
+/* Memory Management: the caller is always responsible to free the results from all variants of cJSON_Parse (with cJSON_Delete) and cJSON_Print (with stdlib free, cJSON_Hooks.free_fn, or cJSON_free as appropriate). The exception is cJSON_PrintPreallocated, where the caller has full responsibility of the buffer. */
+/* Supply a block of JSON, and this returns a cJSON object you can interrogate. */
+CJSON_PUBLIC(cJSON *) cJSON_Parse(const char *value);
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithLength(const char *value, size_t buffer_length);
+/* ParseWithOpts allows you to require (and check) that the JSON is null terminated, and to retrieve the pointer to the final byte parsed. */
+/* If you supply a ptr in return_parse_end and parsing fails, then return_parse_end will contain a pointer to the error so will match cJSON_GetErrorPtr(). */
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithOpts(const char *value, const char **return_parse_end, cJSON_bool require_null_terminated);
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithLengthOpts(const char *value, size_t buffer_length, const char **return_parse_end, cJSON_bool require_null_terminated);
+
+/* Render a cJSON entity to text for transfer/storage. */
+CJSON_PUBLIC(char *) cJSON_Print(const cJSON *item);
+/* Render a cJSON entity to text for transfer/storage without any formatting. */
+CJSON_PUBLIC(char *) cJSON_PrintUnformatted(const cJSON *item);
+/* Render a cJSON entity to text using a buffered strategy. prebuffer is a guess at the final size. guessing well reduces reallocation. fmt=0 gives unformatted, =1 gives formatted */
+CJSON_PUBLIC(char *) cJSON_PrintBuffered(const cJSON *item, int prebuffer, cJSON_bool fmt);
+/* Render a cJSON entity to text using a buffer already allocated in memory with given length. Returns 1 on success and 0 on failure. */
+/* NOTE: cJSON is not always 100% accurate in estimating how much memory it will use, so to be safe allocate 5 bytes more than you actually need */
+CJSON_PUBLIC(cJSON_bool) cJSON_PrintPreallocated(cJSON *item, char *buffer, const int length, const cJSON_bool format);
+/* Delete a cJSON entity and all subentities. */
+CJSON_PUBLIC(void) cJSON_Delete(cJSON *item);
+
+/* Returns the number of items in an array (or object). */
+CJSON_PUBLIC(int) cJSON_GetArraySize(const cJSON *array);
+/* Retrieve item number "index" from array "array". Returns NULL if unsuccessful. */
+CJSON_PUBLIC(cJSON *) cJSON_GetArrayItem(const cJSON *array, int index);
+/* Get item "string" from object. Case insensitive. */
+CJSON_PUBLIC(cJSON *) cJSON_GetObjectItem(const cJSON * const object, const char * const string);
+CJSON_PUBLIC(cJSON *) cJSON_GetObjectItemCaseSensitive(const cJSON * const object, const char * const string);
+CJSON_PUBLIC(cJSON_bool) cJSON_HasObjectItem(const cJSON *object, const char *string);
+/* For analysing failed parses. This returns a pointer to the parse error. You'll probably need to look a few chars back to make sense of it. Defined when cJSON_Parse() returns 0. 0 when no error. */
+CJSON_PUBLIC(const char *) cJSON_GetErrorPtr(void);
+
+/* Check item type */
+CJSON_PUBLIC(cJSON_bool) cJSON_IsInvalid(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsFalse(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsTrue(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsBool(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsNull(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsNumber(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsString(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsArray(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsObject(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsRaw(const cJSON * const item);
+
+/* These calls create a cJSON item of the appropriate type. */
+CJSON_PUBLIC(cJSON *) cJSON_CreateNull(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateTrue(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateFalse(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateBool(cJSON_bool boolean);
+CJSON_PUBLIC(cJSON *) cJSON_CreateNumber(double num);
+CJSON_PUBLIC(cJSON *) cJSON_CreateString(const char *string);
+/* raw json */
+CJSON_PUBLIC(cJSON *) cJSON_CreateRaw(const char *raw);
+CJSON_PUBLIC(cJSON *) cJSON_CreateArray(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateObject(void);
+
+/* Create a string where valuestring references a string so
+ * it will not be freed by cJSON_Delete */
+CJSON_PUBLIC(cJSON *) cJSON_CreateStringReference(const char *string);
+/* Create an object/array that only references it's elements so
+ * they will not be freed by cJSON_Delete */
+CJSON_PUBLIC(cJSON *) cJSON_CreateObjectReference(const cJSON *child);
+CJSON_PUBLIC(cJSON *) cJSON_CreateArrayReference(const cJSON *child);
+
+/* These utilities create an Array of count items.
+ * The parameter count cannot be greater than the number of elements in the number list, otherwise array access will be out of bounds.*/
+CJSON_PUBLIC(cJSON *) cJSON_CreateIntArray(const int *numbers, int count);
+CJSON_PUBLIC(cJSON *) cJSON_CreateFloatArray(const float *numbers, int count);
+CJSON_PUBLIC(cJSON *) cJSON_CreateDoubleArray(const double *numbers, int count);
+CJSON_PUBLIC(cJSON *) cJSON_CreateStringArray(const char *const *strings, int count);
+
+/* Append item to the specified array/object. */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToArray(cJSON *array, cJSON *item);
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObject(cJSON *object, const char *string, cJSON *item);
+/* Use this when string is definitely const (i.e. a literal, or as good as), and will definitely survive the cJSON object.
+ * WARNING: When this function was used, make sure to always check that (item->type & cJSON_StringIsConst) is zero before
+ * writing to `item->string` */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObjectCS(cJSON *object, const char *string, cJSON *item);
+/* Append reference to item to the specified array/object. Use this when you want to add an existing cJSON to a new cJSON, but don't want to corrupt your existing item. */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item);
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToObject(cJSON *object, const char *string, cJSON *item);
+
+/* Remove/Detach items from Arrays/Objects. */
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemViaPointer(cJSON *parent, cJSON * const item);
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromArray(cJSON *array, int which);
+CJSON_PUBLIC(void) cJSON_DeleteItemFromArray(cJSON *array, int which);
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObject(cJSON *object, const char *string);
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObjectCaseSensitive(cJSON *object, const char *string);
+CJSON_PUBLIC(void) cJSON_DeleteItemFromObject(cJSON *object, const char *string);
+CJSON_PUBLIC(void) cJSON_DeleteItemFromObjectCaseSensitive(cJSON *object, const char *string);
+
+/* Update array items. */
+CJSON_PUBLIC(cJSON_bool) cJSON_InsertItemInArray(cJSON *array, int which, cJSON *newitem); /* Shifts pre-existing items to the right. */
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemViaPointer(cJSON * const parent, cJSON * const item, cJSON * replacement);
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInArray(cJSON *array, int which, cJSON *newitem);
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObject(cJSON *object, const char *string, cJSON *newitem);
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObjectCaseSensitive(cJSON *object, const char *string, cJSON *newitem);
+
+/* Duplicate a cJSON item */
+CJSON_PUBLIC(cJSON *) cJSON_Duplicate(const cJSON *item, cJSON_bool recurse);
+/* Duplicate will create a new, identical cJSON item to the one you pass, in new memory that will
+ * need to be released. With recurse!=0, it will duplicate any children connected to the item.
+ * The item->next and ->prev pointers are always zero on return from Duplicate. */
+/* Recursively compare two cJSON items for equality. If either a or b is NULL or invalid, they will be considered unequal.
+ * case_sensitive determines if object keys are treated case sensitive (1) or case insensitive (0) */
+CJSON_PUBLIC(cJSON_bool) cJSON_Compare(const cJSON * const a, const cJSON * const b, const cJSON_bool case_sensitive);
+
+/* Minify a strings, remove blank characters(such as ' ', '\t', '\r', '\n') from strings.
+ * The input pointer json cannot point to a read-only address area, such as a string constant,
+ * but should point to a readable and writable address area. */
+CJSON_PUBLIC(void) cJSON_Minify(char *json);
+
+/* Helper functions for creating and adding items to an object at the same time.
+ * They return the added item or NULL on failure. */
+CJSON_PUBLIC(cJSON*) cJSON_AddNullToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddTrueToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddFalseToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddBoolToObject(cJSON * const object, const char * const name, const cJSON_bool boolean);
+CJSON_PUBLIC(cJSON*) cJSON_AddNumberToObject(cJSON * const object, const char * const name, const double number);
+CJSON_PUBLIC(cJSON*) cJSON_AddStringToObject(cJSON * const object, const char * const name, const char * const string);
+CJSON_PUBLIC(cJSON*) cJSON_AddRawToObject(cJSON * const object, const char * const name, const char * const raw);
+CJSON_PUBLIC(cJSON*) cJSON_AddObjectToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddArrayToObject(cJSON * const object, const char * const name);
+
+/* When assigning an integer value, it needs to be propagated to valuedouble too. */
+#define cJSON_SetIntValue(object, number) ((object) ? (object)->valueint = (object)->valuedouble = (number) : (number))
+/* helper for the cJSON_SetNumberValue macro */
+CJSON_PUBLIC(double) cJSON_SetNumberHelper(cJSON *object, double number);
+#define cJSON_SetNumberValue(object, number) ((object != NULL) ? cJSON_SetNumberHelper(object, (double)number) : (number))
+/* Change the valuestring of a cJSON_String object, only takes effect when type of object is cJSON_String */
+CJSON_PUBLIC(char*) cJSON_SetValuestring(cJSON *object, const char *valuestring);
+
+/* If the object is not a boolean type this does nothing and returns cJSON_Invalid else it returns the new type*/
+#define cJSON_SetBoolValue(object, boolValue) ( \
+    (object != NULL && ((object)->type & (cJSON_False|cJSON_True))) ? \
+    (object)->type=((object)->type &(~(cJSON_False|cJSON_True)))|((boolValue)?cJSON_True:cJSON_False) : \
+    cJSON_Invalid\
+)
+
+/* Macro for iterating over an array or object */
+#define cJSON_ArrayForEach(element, array) for(element = (array != NULL) ? (array)->child : NULL; element != NULL; element = element->next)
+
+/* malloc/free objects using the malloc/free functions that have been set with cJSON_InitHooks */
+CJSON_PUBLIC(void *) cJSON_malloc(size_t size);
+CJSON_PUBLIC(void) cJSON_free(void *object);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

shadowclaw.c

@@ -0,0 +1,653 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <time.h>
+#include <curl/curl.h>
+#include <dirent.h>
+#include "cJSON.h"
+
+// --------------------------------------------------------------------
+//  Shadow Header + Arena (Tsoding/stb_ds style)
+// --------------------------------------------------------------------
+typedef struct {
+    size_t   capacity;     // bytes available AFTER header
+    size_t   length;       // bytes used AFTER header
+    uint64_t tag;          // magic: 0x534841444F57434C = "SHADOWCL"
+    uint32_t version;
+    uint32_t flags;        // bit 0 = dirty
+} ShadowHeader;
+
+#define SHADOW_MAGIC 0x534841444F57434CULL
+#define SHADOW_SIZE (sizeof(ShadowHeader))
+#define ALIGN_UP(x, a) (((x) + (a)-1) & ~((a)-1))
+
+static inline ShadowHeader* shadow_header(void *data) {
+    return (ShadowHeader*)((char*)data - SHADOW_SIZE);
+}
+
+typedef struct {
+    void    *data;       // user‑facing payload pointer
+    size_t   reserved;   // total malloc size (header + capacity)
+} ShadowArena;
+
+ShadowArena shadow_arena_create(size_t initial_capacity) {
+    ShadowArena a = {0};
+    size_t total = SHADOW_SIZE + initial_capacity;
+    total = ALIGN_UP(total, 64);
+
+    ShadowHeader *h = malloc(total);
+    if (!h) abort();
+
+    *h = (ShadowHeader){
+        .capacity = initial_capacity,
+        .length   = 0,
+        .tag      = SHADOW_MAGIC,
+        .version  = 1,
+        .flags    = 0
+    };
+    a.data = (char*)h + SHADOW_SIZE;
+    a.reserved = total;
+    return a;
+}
+
+void shadow_arena_destroy(ShadowArena *a) {
+    if (a->data) {
+        free(shadow_header(a->data));
+        a->data = NULL;
+    }
+}
+
+void* shadow_arena_push(ShadowArena *a, const void *src, size_t bytes) {
+    ShadowHeader *h = shadow_header(a->data);
+
+    if (h->length + bytes > h->capacity) {
+        size_t new_cap = h->capacity ? h->capacity * 2 : 4096;
+        while (new_cap < h->length + bytes) new_cap *= 2;
+        size_t new_total = SHADOW_SIZE + new_cap;
+        new_total = ALIGN_UP(new_total, 64);
+
+        ShadowHeader *new_h = realloc(h, new_total);
+        if (!new_h) abort();
+
+        new_h->capacity = new_cap;
+        a->data = (char*)new_h + SHADOW_SIZE;
+        a->reserved = new_total;
+        h = new_h;
+    }
+
+    char *dst = (char*)a->data + h->length;
+    if (src) memcpy(dst, src, bytes);
+    else     memset(dst, 0, bytes);
+
+    h->length += bytes;
+    h->flags |= 1;  // dirty
+    return dst;
+}
+
+size_t shadow_arena_len(const ShadowArena *a) {
+    return shadow_header(a->data)->length;
+}
+
+void shadow_arena_clear(ShadowArena *a) {
+    ShadowHeader *h = shadow_header(a->data);
+    h->length = 0;
+    h->flags &= ~1;
+}
+
+// --------------------------------------------------------------------
+//  Blob Format (tagged, length‑prefixed items)
+// --------------------------------------------------------------------
+typedef struct {
+    uint32_t size;       // payload size (excluding this header)
+    uint32_t kind;       // 1=system,2=user,3=assistant,4=tool_call,5=tool_result,6=memory
+    uint64_t id;         // unique id (timestamp or counter)
+} BlobHeader;
+
+// Append a typed blob – returns offset from arena->data start
+ptrdiff_t blob_append(ShadowArena *a, uint32_t kind, uint64_t id,
+                      const void *payload, size_t payload_bytes)
+{
+    size_t total = sizeof(BlobHeader) + payload_bytes;
+    char *p = shadow_arena_push(a, NULL, total);
+
+    BlobHeader bh = {
+        .size = (uint32_t)payload_bytes,
+        .kind = kind,
+        .id   = id
+    };
+    memcpy(p, &bh, sizeof(bh));
+    if (payload_bytes) memcpy(p + sizeof(bh), payload, payload_bytes);
+    return p - (char*)a->data;
+}
+
+// Iterate over all blobs: calls `f(blob_header, payload, userdata)`
+void blob_foreach(ShadowArena *a,
+                  void (*f)(const BlobHeader*, const char*, void*),
+                  void *userdata)
+{
+    char *start = a->data;
+    size_t len = shadow_header(a->data)->length;
+    char *end = start + len;
+    char *p = start;
+    while (p < end) {
+        BlobHeader *bh = (BlobHeader*)p;
+        char *payload = p + sizeof(BlobHeader);
+        f(bh, payload, userdata);
+        p += sizeof(BlobHeader) + bh->size;
+    }
+}
+
+// --------------------------------------------------------------------
+//  Persistence: save / load the whole arena to a file
+// --------------------------------------------------------------------
+bool arena_save(const ShadowArena *a, const char *filename) {
+    FILE *f = fopen(filename, "wb");
+    if (!f) return false;
+    size_t n = fwrite(shadow_header(a->data), 1, a->reserved, f);
+    fclose(f);
+    return n == a->reserved;
+}
+
+bool arena_load(ShadowArena *a, const char *filename) {
+    FILE *f = fopen(filename, "rb");
+    if (!f) return false;
+
+    fseek(f, 0, SEEK_END);
+    long size = ftell(f);
+    fseek(f, 0, SEEK_SET);
+    if (size < (long)SHADOW_SIZE) {
+        fclose(f);
+        return false;
+    }
+
+    void *block = malloc(size);
+    if (!block) { fclose(f); return false; }
+    if (fread(block, 1, size, f) != (size_t)size) {
+        free(block);
+        fclose(f);
+        return false;
+    }
+    fclose(f);
+
+    ShadowHeader *h = (ShadowHeader*)block;
+    if (h->tag != SHADOW_MAGIC || h->version != 1) {
+        free(block);
+        return false;
+    }
+
+    shadow_arena_destroy(a);
+    a->data = (char*)block + SHADOW_SIZE;
+    a->reserved = size;
+    return true;
+}
+
+// --------------------------------------------------------------------
+//  Tools
+// --------------------------------------------------------------------
+typedef struct {
+    char *name;
+    char *(*func)(const char *args);   // returns newly allocated string
+} Tool;
+
+// tool: shell command execution
+char* tool_shell(const char *args) {
+    FILE *fp = popen(args, "r");
+    if (!fp) return strdup("error: popen failed");
+    char *result = NULL;
+    size_t len = 0;
+    FILE *out = open_memstream(&result, &len);
+    char buf[256];
+    while (fgets(buf, sizeof(buf), fp)) fputs(buf, out);
+    pclose(fp);
+    fclose(out);
+    return result ? result : strdup("");
+}
+
+// tool: read file
+char* tool_read_file(const char *args) {
+    FILE *fp = fopen(args, "rb");
+    if (!fp) return strdup("error: cannot open file");
+    char *content = NULL;
+    size_t len = 0;
+    FILE *out = open_memstream(&content, &len);
+    char buf[4096];
+    size_t n;
+    while ((n = fread(buf, 1, sizeof(buf), fp)) > 0)
+        fwrite(buf, 1, n, out);
+    fclose(fp);
+    fclose(out);
+    return content ? content : strdup("");
+}
+
+// tool: write file (args: "filename\ncontent")
+char* tool_write_file(const char *args) {
+    char *filename = strdup(args);
+    char *newline = strchr(filename, '\n');
+    if (!newline) {
+        free(filename);
+        return strdup("error: missing newline separator");
+    }
+    *newline = '\0';
+    char *content = newline + 1;
+    FILE *fp = fopen(filename, "wb");
+    if (!fp) {
+        free(filename);
+        return strdup("error: cannot write file");
+    }
+    fwrite(content, 1, strlen(content), fp);
+    fclose(fp);
+    free(filename);
+    return strdup("ok");
+}
+
+// tool: HTTP GET (args = URL)
+size_t write_cb(void *ptr, size_t size, size_t nmemb, void *stream) {
+    size_t total = size * nmemb;
+    fwrite(ptr, 1, total, (FILE*)stream);
+    return total;
+}
+char* tool_http_get(const char *args) {
+    CURL *curl = curl_easy_init();
+    if (!curl) return strdup("error: curl init failed");
+
+    char *response = NULL;
+    size_t len = 0;
+    FILE *out = open_memstream(&response, &len);
+
+    curl_easy_setopt(curl, CURLOPT_URL, args);
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_cb);
+    curl_easy_setopt(curl, CURLOPT_WRITEDATA, out);
+    curl_easy_setopt(curl, CURLOPT_TIMEOUT, 10L);
+    CURLcode res = curl_easy_perform(curl);
+    if (res != CURLE_OK) {
+        fclose(out);
+        curl_easy_cleanup(curl);
+        return strdup("error: curl failed");
+    }
+    fclose(out);
+    curl_easy_cleanup(curl);
+    return response ? response : strdup("");
+}
+
+// tool: math expression (using bc)
+char* tool_math(const char *args) {
+    char cmd[4096];
+    snprintf(cmd, sizeof(cmd), "echo '%s' | bc 2>/dev/null", args);
+    FILE *fp = popen(cmd, "r");
+    if (!fp) return strdup("error: bc failed");
+    char *result = NULL;
+    size_t len = 0;
+    FILE *out = open_memstream(&result, &len);
+    char buf[256];
+    while (fgets(buf, sizeof(buf), fp)) fputs(buf, out);
+    pclose(fp);
+    fclose(out);
+    return result ? result : strdup("");
+}
+
+// tool: list directory
+char* tool_list_dir(const char *args) {
+    DIR *d = opendir(args);
+    if (!d) return strdup("error: cannot open directory");
+    char *result = NULL;
+    size_t len = 0;
+    FILE *out = open_memstream(&result, &len);
+    struct dirent *entry;
+    while ((entry = readdir(d)) != NULL) {
+        fprintf(out, "%s\n", entry->d_name);
+    }
+    closedir(d);
+    fclose(out);
+    return result ? result : strdup("");
+}
+
+// tool registry
+Tool tools[] = {
+    {"shell", tool_shell},
+    {"read_file", tool_read_file},
+    {"write_file", tool_write_file},
+    {"http_get", tool_http_get},
+    {"math", tool_math},
+    {"list_dir", tool_list_dir},
+    {NULL, NULL}
+};
+
+char* execute_tool(const char *name, const char *args) {
+    for (Tool *t = tools; t->name; t++) {
+        if (strcmp(t->name, name) == 0) {
+            return t->func(args);
+        }
+    }
+    return strdup("error: unknown tool");
+}
+
+// --------------------------------------------------------------------
+//  LLM interaction (Ollama)
+// --------------------------------------------------------------------
+typedef struct {
+    char *data;
+    size_t len;
+} ResponseBuffer;
+
+size_t write_response(void *ptr, size_t size, size_t nmemb, void *stream) {
+    ResponseBuffer *buf = (ResponseBuffer*)stream;
+    size_t total = size * nmemb;
+    buf->data = realloc(buf->data, buf->len + total + 1);
+    if (!buf->data) return 0;
+    memcpy(buf->data + buf->len, ptr, total);
+    buf->len += total;
+    buf->data[buf->len] = '\0';
+    return total;
+}
+
+// call Ollama generate endpoint, return JSON string (malloced)
+char* ollama_generate(const char *prompt, const char *model, const char *endpoint) {
+    CURL *curl = curl_easy_init();
+    if (!curl) return NULL;
+
+    char url[256];
+    snprintf(url, sizeof(url), "%s/api/generate", endpoint);
+
+    cJSON *req_json = cJSON_CreateObject();
+    cJSON_AddStringToObject(req_json, "model", model);
+    cJSON_AddStringToObject(req_json, "prompt", prompt);
+    cJSON_AddBoolToObject(req_json, "stream", false);
+    char *req_str = cJSON_PrintUnformatted(req_json);
+    cJSON_Delete(req_json);
+
+    struct curl_slist *headers = NULL;
+    headers = curl_slist_append(headers, "Content-Type: application/json");
+
+    ResponseBuffer resp = {0};
+    curl_easy_setopt(curl, CURLOPT_URL, url);
+    curl_easy_setopt(curl, CURLOPT_POST, 1L);
+    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
+    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, req_str);
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_response);
+    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &resp);
+
+    CURLcode res = curl_easy_perform(curl);
+    free(req_str);
+    curl_slist_free_all(headers);
+    curl_easy_cleanup(curl);
+
+    if (res != CURLE_OK) {
+        free(resp.data);
+        return NULL;
+    }
+    return resp.data; // caller must free
+}
+
+// --------------------------------------------------------------------
+//  Prompt builder (exactly as in beta10)
+// --------------------------------------------------------------------
+typedef struct {
+    char *text;
+    size_t cap;
+    size_t len;
+} StringBuilder;
+
+void sb_append(StringBuilder *sb, const char *s) {
+    size_t add = strlen(s);
+    if (sb->len + add + 1 > sb->cap) {
+        sb->cap = sb->cap ? sb->cap * 2 : 1024;
+        while (sb->len + add + 1 > sb->cap) sb->cap *= 2;
+        sb->text = realloc(sb->text, sb->cap);
+    }
+    memcpy(sb->text + sb->len, s, add);
+    sb->len += add;
+    sb->text[sb->len] = '\0';
+}
+
+void collect_blob(const BlobHeader *bh, const char *payload, void *user) {
+    StringBuilder *sb = (StringBuilder*)user;
+    static int count = 0;
+    // keep only system (kind 1) and last 10 user/assistant/tool messages
+    if (bh->kind == 1) {
+        sb_append(sb, "[System]\n");
+        sb_append(sb, payload);
+        sb_append(sb, "\n\n");
+    } else if (bh->kind == 2 || bh->kind == 3 || bh->kind == 5) {
+        if (count < 10) {
+            const char *role = bh->kind==2 ? "User" : (bh->kind==3 ? "Assistant" : "Tool");
+            sb_append(sb, "[");
+            sb_append(sb, role);
+            sb_append(sb, "]\n");
+            sb_append(sb, payload);
+            sb_append(sb, "\n\n");
+            count++;
+        }
+    }
+}
+
+char* build_prompt(ShadowArena *arena) {
+    StringBuilder sb = {0};
+    // include system prompt and recent conversation
+    blob_foreach(arena, collect_blob, &sb);
+    // add instructions for tool use (exactly as beta10)
+    sb_append(&sb,
+        "[Instruction]\n"
+        "You are ShadowClaw, a tiny AI agent. You can use tools by outputting a JSON block like:\n"
+        "```tool\n{\"tool\":\"name\",\"args\":\"arguments\"}\n```\n"
+        "Available tools: shell, read_file, write_file, http_get, math, list_dir.\n"
+        "After using a tool, you'll see its result. Continue the conversation.\n\n"
+        "[User]\n");
+    return sb.text; // caller must free
+}
+
+// --------------------------------------------------------------------
+//  Parse tool call from assistant text (look for ```tool ... ```)
+//  Enhanced to handle both string and array args
+// --------------------------------------------------------------------
+char* parse_tool_call(const char *text, char **tool_name, char **tool_args) {
+    const char *start = strstr(text, "```tool");
+    if (!start) return NULL;
+    start += 7; // skip ```tool
+    while (*start == ' ' || *start == '\n') start++;
+    const char *end = strstr(start, "```");
+    if (!end) return NULL;
+
+    size_t len = end - start;
+    char *json_str = malloc(len + 1);
+    memcpy(json_str, start, len);
+    json_str[len] = '\0';
+
+    cJSON *root = cJSON_Parse(json_str);
+    free(json_str);
+    if (!root) return NULL;
+
+    cJSON *name = cJSON_GetObjectItem(root, "tool");
+    if (!cJSON_IsString(name)) {
+        cJSON_Delete(root);
+        return NULL;
+    }
+
+    cJSON *args = cJSON_GetObjectItem(root, "args");
+    char *args_str = NULL;
+    if (cJSON_IsString(args)) {
+        args_str = strdup(args->valuestring);
+    } else if (cJSON_IsArray(args)) {
+        int count = cJSON_GetArraySize(args);
+        size_t total_len = 0;
+        for (int i = 0; i < count; i++) {
+            cJSON *elem = cJSON_GetArrayItem(args, i);
+            if (cJSON_IsString(elem)) {
+                if (i > 0) total_len++; // space
+                total_len += strlen(elem->valuestring);
+            }
+        }
+        args_str = malloc(total_len + 1);
+        if (args_str) {
+            args_str[0] = '\0';
+            for (int i = 0; i < count; i++) {
+                cJSON *elem = cJSON_GetArrayItem(args, i);
+                if (cJSON_IsString(elem)) {
+                    if (i > 0) strcat(args_str, " ");
+                    strcat(args_str, elem->valuestring);
+                }
+            }
+        } else {
+            args_str = strdup("");
+        }
+    } else {
+        args_str = strdup("");
+    }
+
+    *tool_name = strdup(name->valuestring);
+    *tool_args = args_str;
+    cJSON_Delete(root);
+    return (char*)end + 3; // pointer after the closing ```
+}
+
+// --------------------------------------------------------------------
+//  Main (with slash commands from v1.2.2)
+// --------------------------------------------------------------------
+int main(int argc, char **argv) {
+    const char *state_file = "shadowclaw.bin";
+    const char *ollama_endpoint = "http://localhost:11434";
+    const char *ollama_model = "qwen2.5:0.5b";  // change as needed
+
+    ShadowArena arena = shadow_arena_create(128 * 1024); // 128KB start
+
+    // load previous state if exists
+    if (access(state_file, F_OK) == 0) {
+        if (arena_load(&arena, state_file)) {
+            printf("[ShadowClaw] loaded state from %s\n", state_file);
+        } else {
+            printf("[ShadowClaw] failed to load %s, starting fresh\n", state_file);
+        }
+    } else {
+        // bootstrap system prompt (includes list_dir)
+        const char *sys = "You are ShadowClaw – tiny, shadowy, Unix‑punk AI agent. Use tools when helpful. Stay minimal.\n"
+                          "Available tools: shell, read_file, write_file, http_get, math, list_dir.";
+        blob_append(&arena, 1, 1, sys, strlen(sys)+1);
+    }
+
+    uint64_t msg_id = time(NULL); // simple id
+
+    printf("ShadowClaw ready. Type your message (Ctrl-D to exit)\n");
+    char line[4096];
+    while (fgets(line, sizeof(line), stdin)) {
+        // remove trailing newline
+        line[strcspn(line, "\n")] = 0;
+        if (strlen(line) == 0) continue;
+
+        // ----- Slash commands (always available) -----
+        if (line[0] == '/') {
+            if (strcmp(line, "/help") == 0) {
+                printf("Shadowclaw commands:\n"
+                       "  /help       Show this help\n"
+                       "  /tools      List available tools\n"
+                       "  /state      Show arena memory stats\n"
+                       "  /clear      Clear conversation history (keeps system prompt)\n"
+                       "  /chat       Remind you that chat mode is active\n"
+                       "  /exit       Exit Shadowclaw\n");
+            } else if (strcmp(line, "/tools") == 0) {
+                printf("Available tools:\n");
+                for (Tool *t = tools; t->name; t++) {
+                    printf("  %s\n", t->name);
+                }
+            } else if (strcmp(line, "/state") == 0) {
+                ShadowHeader *h = shadow_header(arena.data);
+                printf("Arena capacity: %zu bytes\n", h->capacity);
+                printf("Arena used: %zu bytes\n", h->length);
+                printf("Reserved total: %zu bytes\n", arena.reserved);
+                printf("Dirty flag: %d\n", h->flags & 1);
+            } else if (strcmp(line, "/clear") == 0) {
+                shadow_arena_clear(&arena);
+                // Re-add system prompt
+                const char *sys = "You are ShadowClaw – tiny, shadowy, Unix‑punk AI agent. Use tools when helpful. Stay minimal.\n"
+                                  "Available tools: shell, read_file, write_file, http_get, math, list_dir.";
+                blob_append(&arena, 1, 1, sys, strlen(sys)+1);
+                printf("Conversation cleared.\n");
+            } else if (strcmp(line, "/chat") == 0) {
+                printf("You are already in chat mode. Type your message.\n");
+            } else if (strcmp(line, "/exit") == 0) {
+                break;
+            } else {
+                printf("Unknown command. Try /help\n");
+            }
+            continue;
+        }
+
+        // ----- Normal LLM mode (exactly like beta10) -----
+        // store user message
+        blob_append(&arena, 2, msg_id++, line, strlen(line)+1);
+
+        // build prompt from arena
+        char *prompt = build_prompt(&arena);
+        if (!prompt) {
+            fprintf(stderr, "error building prompt\n");
+            break;
+        }
+
+        // call ollama
+        char *response_json = ollama_generate(prompt, ollama_model, ollama_endpoint);
+        free(prompt);
+        if (!response_json) {
+            fprintf(stderr, "LLM call failed\n");
+            continue;
+        }
+
+        // parse response
+        cJSON *root = cJSON_Parse(response_json);
+        if (!root) {
+            fprintf(stderr, "JSON parse error. Raw response: %s\n", response_json);
+            free(response_json);
+            continue;
+        }
+
+        // Check for error field (Ollama error response)
+        cJSON *err = cJSON_GetObjectItem(root, "error");
+        if (err && cJSON_IsString(err)) {
+            fprintf(stderr, "Ollama error: %s\n", err->valuestring);
+            cJSON_Delete(root);
+            free(response_json);
+            continue;
+        }
+
+        cJSON *resp_text = cJSON_GetObjectItem(root, "response");
+        if (!cJSON_IsString(resp_text)) {
+            fprintf(stderr, "no 'response' field in LLM output. Full JSON: %s\n", response_json);
+            cJSON_Delete(root);
+            free(response_json);
+            continue;
+        }
+        const char *assistant_msg = resp_text->valuestring;
+
+        // check for tool call
+        char *tool_name = NULL, *tool_args = NULL;
+        char *after_tool = parse_tool_call(assistant_msg, &tool_name, &tool_args);
+        if (tool_name && tool_args) {
+            // execute tool
+            char *tool_result = execute_tool(tool_name, tool_args);
+            // store tool call and result
+            blob_append(&arena, 4, msg_id++, assistant_msg, after_tool - assistant_msg);
+            blob_append(&arena, 5, msg_id++, tool_result, strlen(tool_result)+1);
+            // print result and continue (LLM will see it in next round)
+            printf("\n[Tool %s] → %s\n", tool_name, tool_result);
+            free(tool_result);
+            free(tool_name);
+            free(tool_args);
+        } else {
+            // normal assistant response
+            printf("\n[ShadowClaw] %s\n", assistant_msg);
+            blob_append(&arena, 3, msg_id++, assistant_msg, strlen(assistant_msg)+1);
+        }
+
+        cJSON_Delete(root);
+        free(response_json);
+
+        // save arena after each interaction
+        if (!arena_save(&arena, state_file)) {
+            fprintf(stderr, "warning: could not save state\n");
+        }
+    }
+
+    shadow_arena_destroy(&arena);
+    return 0;
+}