• C语言解析JSON源码

    它与 XML 的地位差不多，但就笔者而言，笔者更喜欢 JSON 的风格，因为它更符合我们的思维习惯，同样一份数据，JSON 格式的就是比 XML 要清晰明了一些。

    最近笔者需要在 C语言 上解析 JSON 格式，在网上一顿找，找到一份很不错的开源代码。经过一阵研究与修改以后，终于变成了让笔者用的很顺手的 C语言 版 JSON 解析器。

    现将这份经笔者小小修改过的代码记录一下，一来想给自己作个备忘，二来希望能帮到有同样需求的同学。

    这份源码以及一份简易 demo 被打包至博客园网盘：

    https://files.cnblogs.com/files/chorm590/C%E8%AF%AD%E8%A8%80%E8%A7%A3%E6%9E%90JSON%E7%A4%BA%E4%BE%8B.zip

    这个压缩内包含有两份源码文件：

    1、cJSON 解析器原始版与示例以及 readme 说明

    2、经笔者修改过的示例代码

    这里仅以笔者修改过的代码来作简要讲解。

    经笔者修改过的代码文件共有 3 个代码文件，如下图所示：

    其中 demo.c 是演示程序，共编写了 3 种常见的 JSON 数据格式及其解析方式来展示 cJSON 的用法。整个示例程序非常简单，同学们稍加阅读定能领悟其用法。

    在这个解析器中，所有的 JSON 节点都被抽象成是一个 cJSON 对象，即 cJSON 结构体：

    如上图所示，在这个解析器中，JSON 对象节点与 JSON 数组节点被绑在 next, prev, child 三个指针变量中。但凡涉及到 JSON 对象与 JSON 数组的解析，都可以快速地用这三个指针变量来找到对应的值。

    本节点的类型则被记录在 type 变量中。type 的可选值如下图所示：

    节点的值则被保存在 valuestring, valueint, valuedouble 中。其中 boolean 值是被当成 valueint 保存的。true 以 1 表示，false 以 0 表示。

    而节点自身的名称，则是被保存在 struct cJSON 结构图所示的 string 变量中。

    至于最后一个 pure_json 变量，则是笔者自己添加的。添加它的目的是为了保存去除了额外的空格字符与换行字符以后的纯 JSON 文本。是的，这个 cJSON 解析器默认情况下只能解析最标准格式的 JSON 文本，如下图所示：

    而不能解析排版过后的 JSON 格式，如下图所示：

    笔者前面提到的“稍稍修改了一下的版本”就是指添加了可以解析这种排版过后的 JSON 文本的功能。笔者为了在将“格式化”后的文本用完以后可以方便地 free 掉，就在 cJSON 结构体中添加了这个 pur_string 变量。同时，笔者这个格式化还可以保留字符串值中的空格字符与换行字符。

    在使用这个解析器解析 JSON 时，只需要将原始 JSON 字符串传入 cJSON_Parse() 函数中即可自动将整个字符串解析一遍，并创建对应的节点链表。

    不过必须要注意，由于解析 JSON 是使用 malloc 来分配内存空间的，因此在使用完以后一定要释放掉这些内存。释放内存的方式也简单，直接将根节点作为参数传入 cJSON_Delete() 函数中即可。

    至于这个解析器解析的流程，有兴趣的同学可以自己去跟踪 cJSON.c 的源码实现。它并不复杂，笔者就不再这里赘述了。

    如果你时间有限，也可以直接参考或修改笔者的示例代码来直接应用。

    修改后的代码如下：

    1、demo.c

    1. #include 
    2. #include "cJSON.h"
    3.  
    4. static void parse_normal_json();
    5. static void parse_object_json();
    6. static void parse_array_json();
    7.  
    8. int main()
    9. {
    10.     printf("hello world\n");
    11.     
    12.     parse_normal_json();
    13.     parse_object_json();
    14.     parse_array_json();
    15.     
    16.     return 0;
    17. }
    18.  
    19. static void parse_normal_json()
    20. {
    21.     printf("\n\n\n>>> parse_normal_json()\n\n");
    22.     const char *json = "\n\
    23.     {\n\
    24.         \"key0\":\"Js   on is a fun\nny data for      mat!\",\n\
    25.         \"key1\":\"value1\",\n\
    26.         \"key2\":26,\n\
    27.         \"key3\":false\n\
    28.     }\n\
    29.     ";
    30.     
    31.     printf("json:\n%s\n\n", json);
    32.     
    33.     cJSON *root = cJSON_Parse(json);
    34.     if(root == 0)
    35.     {
    36.         printf("error\n");
    37.         return;
    38.     }
    39.     
    40.     cJSON *key0_node = cJSON_GetObjectItem(root, "key0");
    41.     if(key0_node == 0)
    42.         return;
    43.     printf("key0 name:\n\t%s\nkey0 value:\n\t%s\n", key0_node->string, key0_node->valuestring);
    44.     
    45.     cJSON *key1_node = cJSON_GetObjectItem(root, "key1");
    46.     if(key1_node == 0)
    47.         return;
    48.     printf("key1 value:\n\t%s\n", key1_node->valuestring);
    49.     
    50.     cJSON *key2_node = cJSON_GetObjectItem(root, "key2");
    51.     if(key2_node == 0)
    52.         return;
    53.     printf("key2 value:\n\t%d\n", key2_node->valueint);
    54.     
    55.     cJSON *key3_node = cJSON_GetObjectItem(root, "key3");
    56.     if(key3_node == 0)
    57.         return;
    58.     printf("key3 value:\n\t%d\n", key1_node->valueint);
    59.     
    60.     cJSON_Delete(root);
    61. }
    62.  
    63. static void parse_object_json()
    64. {
    65.     printf("\n\n\n>>> parse_object_json()\n\n");
    66.     const char *json = "\n\
    67.     {\n\
    68.         \"obj\":{\n\
    69.             \"key\":71,\n\
    70.             \"name\":22\n\
    71.         }\n\
    72.     }\n\
    73.     ";
    74.     
    75.     printf("json:\n%s\n\n", json);
    76.     
    77.     cJSON *root = cJSON_Parse(json);
    78.     if(root == 0)
    79.     {
    80.         printf("error\n");
    81.         return;
    82.     }
    83.     
    84.     cJSON *obj_node = cJSON_GetObjectItem(root, "obj");
    85.     if(obj_node == 0)
    86.         return;
    87.     
    88.     cJSON *key_node = cJSON_GetObjectItem(obj_node, "key");
    89.     if(key_node == 0)
    90.         return;
    91.     printf("key value:\n\t%d\n", key_node->valueint);
    92.     
    93.     cJSON *child = obj_node->child;
    94.     if(child == 0)
    95.         return;
    96.     
    97.     printf("key name:\n\t%s\nkey value:\n\t%d\n", child->string, child->valueint);
    98.     cJSON *name_node = child->next;
    99.     if(name_node == 0)
    100.         return;
    101.     printf("name name:\n\t%s\nname value:\n\t%d\n", name_node->string, name_node->valueint);
    102.     
    103.     cJSON_Delete(root);
    104. }
    105.  
    106. static void parse_array_json()
    107. {
    108.      printf("\n\n\n>>> parse_array_json()\n\n");
    109.     const char *json = "\n\
    110.     {\n\
    111.         \"arrs\":[15,3,99,108,22]\n\
    112.     }\n\
    113.     ";
    114.     
    115.     printf("json:\n%s\n\n", json);
    116.     
    117.     cJSON *root = cJSON_Parse(json);
    118.     if(root == 0)
    119.     {
    120.         printf("error\n");
    121.         return;
    122.     }
    123.     
    124.     cJSON *arrs_node = cJSON_GetObjectItem(root, "arrs");
    125.     if(arrs_node == 0)
    126.         return;
    127.     
    128.     if(arrs_node->type == cJSON_Array)
    129.     {
    130.         cJSON *node = arrs_node->child;
    131.         int i = 0;
    132.         while(node != 0)
    133.         {
    134.             printf("item%d:\n\t%d\n", i++, node->valueint);
    135.             node = node->next;
    136.         }
    137.     }
    138.     else
    139.     {
    140.         printf("arrs_node is not a json_array.\n");
    141.     }
    142.     
    143.     
    144.     cJSON_Delete(root);
    145. }

    2、cJSON.c

    1. /*
    2.   Copyright (c) 2009 Dave Gamble
    4.   Permission is hereby granted, free of charge, to any person obtaining a copy
    5.   of this software and associated documentation files (the "Software"), to deal
    6.   in the Software without restriction, including without limitation the rights
    7.   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    8.   copies of the Software, and to permit persons to whom the Software is
    9.   furnished to do so, subject to the following conditions:
    11.   The above copyright notice and this permission notice shall be included in
    12.   all copies or substantial portions of the Software.
    14.   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    15.   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    16.   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    17.   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    18.   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    19.   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    20.   THE SOFTWARE.
    21. */
    22.  
    23. /* cJSON */
    24. /* JSON parser in C. */
    25.  
    26.  
    27. #define _CRT_SECURE_NO_WARNINGS
    28.  
    29. #include 
    30. #include 
    31. #include 
    32. #include 
    33. #include 
    34. #include 
    35. #include 
    36. #include "cJSON.h"
    37.  
    38.  
    39.  
    40.  
    41. static const char *ep;
    42.  
    43. const char *cJSON_GetErrorPtr(void) {return ep;}
    44.  
    45. static int cJSON_strcasecmp(const char *s1,const char *s2)
    46. {
    47. 	if (!s1) return (s1==s2)?0:1;if (!s2) return 1;
    48. 	for(; tolower(*s1) == tolower(*s2); ++s1, ++s2)	if(*s1 == 0)	return 0;
    49. 	return tolower(*(const unsigned char *)s1) - tolower(*(const unsigned char *)s2);
    50. }
    51.  
    52. static void *(*cJSON_malloc)(size_t sz) = malloc;
    53. static void (*cJSON_free)(void *ptr) = free;
    54.  
    55. static char* cJSON_strdup(const char* str)
    56. {
    57.       size_t len;
    58.       char* copy;
    59.  
    60.       len = strlen(str) + 1;
    61.       if (!(copy = (char*)cJSON_malloc(len))) return 0;
    62.       memcpy(copy,str,len);
    63.       return copy;
    64. }
    65.  
    66. void cJSON_InitHooks(cJSON_Hooks* hooks)
    67. {
    68.     if (!hooks) { /* Reset hooks */
    69.         cJSON_malloc = malloc;
    70.         cJSON_free = free;
    71.         return;
    72.     }
    73.  
    74. 	cJSON_malloc = (hooks->malloc_fn)?hooks->malloc_fn:malloc;
    75. 	cJSON_free	 = (hooks->free_fn)?hooks->free_fn:free;
    76. }
    77.  
    78. /* Internal constructor. */
    79. static cJSON *cJSON_New_Item(void)
    80. {
    81. 	cJSON* node = (cJSON*)cJSON_malloc(sizeof(cJSON));
    82. 	if (node) memset(node,0,sizeof(cJSON));
    83. 	return node;
    84. }
    85.  
    86. /* Delete a cJSON structure. */
    87. void cJSON_Delete(cJSON *c)
    88. {
    89. 	cJSON *next;
    90.     if(c != NULL)//chorm,2020-01-03 17:41
    91.     {
    92.         if(c->pure_json != NULL)
    93.         {
    94.             free(c->pure_json);
    95.         }
    96.     }
    97.     
    98. 	while (c)
    99. 	{
    100. 		next=c->next;
    101. 		if (!(c->type&cJSON_IsReference) && c->child) cJSON_Delete(c->child);
    102. 		if (!(c->type&cJSON_IsReference) && c->valuestring) cJSON_free(c->valuestring);
    103. 		if (!(c->type&cJSON_StringIsConst) && c->string) cJSON_free(c->string);
    104. 		cJSON_free(c);
    105. 		c=next;
    106. 	}
    107. }
    108.  
    109. /* Parse the input text to generate a number, and populate the result into item. */
    110. static const char *parse_number(cJSON *item,const char *num)
    111. {
    112. 	double n=0,sign=1,scale=0;int subscale=0,signsubscale=1;
    113.  
    114. 	if (*num=='-')
    115.         sign=-1,num++;  /* Has sign? */
    116. 	if (*num=='0')
    117.         num++;          /* is zero */
    118. 	if (*num>='1' && *num<='9')
    119.     {   
    120.         do{
    121.             n = (n*10.0) + (*num++ - '0');
    122.         }while (*num>='0' && *num<='9'); /* Number? */
    123.     }
    124.  
    125.     if (*num=='.' && num[1]>='0' && num[1]<='9')
    126.     {
    127.         num++;
    128.         do
    129.             n=(n*10.0)+(*num++ -'0'),scale--;
    130.         while (*num>='0' && *num<='9');
    131.     }  /* Fractional part? */
    132.     
    133. 	if (*num=='e' || *num=='E')		/* Exponent? */
    134. 	{
    135. 	    num++;
    136.         if (*num=='+')
    137.             num++;
    138.         else if (*num=='-')
    139.             signsubscale=-1,num++;      /* With sign? */
    140.  
    141.         while (*num>='0' && *num<='9')
    142.             subscale = (subscale*10)+(*num++ - '0');  /* Number? */
    143. 	}
    144.  
    145. 	n = sign*n*pow(10.0,(scale+subscale*signsubscale));	/* number = +/- number.fraction * 10^+/- exponent */
    146. 	
    147. 	item->valuedouble=n;
    148. 	item->valueint=(int)n;
    149. 	item->type=cJSON_Number;
    150.     
    151. 	return num;
    152. }
    153.  
    154. static int pow2gt (int x)	{	--x;	x|=x>>1;	x|=x>>2;	x|=x>>4;	x|=x>>8;	x|=x>>16;	return x+1;	}
    155.  
    156. typedef struct {char *buffer; int length; int offset; } printbuffer;
    157.  
    158. static char* ensure(printbuffer *p,int needed)
    159. {
    160. 	char *newbuffer;int newsize;
    161. 	if (!p || !p->buffer) return 0;
    162. 	needed+=p->offset;
    163. 	if (needed<=p->length) return p->buffer+p->offset;
    164.  
    165. 	newsize=pow2gt(needed);
    166. 	newbuffer=(char*)cJSON_malloc(newsize);
    167. 	if (!newbuffer) {cJSON_free(p->buffer);p->length=0,p->buffer=0;return 0;}
    168. 	if (newbuffer) memcpy(newbuffer,p->buffer,p->length);
    169. 	cJSON_free(p->buffer);
    170. 	p->length=newsize;
    171. 	p->buffer=newbuffer;
    172. 	return newbuffer+p->offset;
    173. }
    174.  
    175. static int update(printbuffer *p)
    176. {
    177. 	char *str;
    178. 	if (!p || !p->buffer) return 0;
    179. 	str=p->buffer+p->offset;
    180. 	return p->offset+strlen(str);
    181. }
    182.  
    183. /* Render the number nicely from the given item into a string. */
    184. static char *print_number(cJSON *item,printbuffer *p)
    185. {
    186. 	char *str=0;
    187. 	double d=item->valuedouble;
    188. 	if (d==0)
    189. 	{
    190. 		if (p)	str=ensure(p,2);
    191. 		else	str=(char*)cJSON_malloc(2);	/* special case for 0. */
    192. 		if (str) strcpy(str,"0");
    193. 	}
    194. 	else if (fabs(((double)item->valueint)-d)<=DBL_EPSILON && d<=INT_MAX && d>=INT_MIN)
    195. 	{
    196. 		if (p)	str=ensure(p,21);
    197. 		else	str=(char*)cJSON_malloc(21);	/* 2^64+1 can be represented in 21 chars. */
    198. 		if (str)	sprintf(str,"%d",item->valueint);
    199. 	}
    200. 	else
    201. 	{
    202. 		if (p)	str=ensure(p,64);
    203. 		else	str=(char*)cJSON_malloc(64);	/* This is a nice tradeoff. */
    204. 		if (str)
    205. 		{
    206. 			if (fabs(floor(d)-d)<=DBL_EPSILON && fabs(d)<1.0e60)sprintf(str,"%.0f",d);
    207. 			else if (fabs(d)<1.0e-6 || fabs(d)>1.0e9)			sprintf(str,"%e",d);
    208. 			else												sprintf(str,"%f",d);
    209. 		}
    210. 	}
    211. 	return str;
    212. }
    213.  
    214. static unsigned parse_hex4(const char *str)
    215. {
    216. 	unsigned h=0;
    217. 	if (*str>='0' && *str<='9') h+=(*str)-'0'; else if (*str>='A' && *str<='F') h+=10+(*str)-'A'; else if (*str>='a' && *str<='f') h+=10+(*str)-'a'; else return 0;
    218. 	h=h<<4;str++;
    219. 	if (*str>='0' && *str<='9') h+=(*str)-'0'; else if (*str>='A' && *str<='F') h+=10+(*str)-'A'; else if (*str>='a' && *str<='f') h+=10+(*str)-'a'; else return 0;
    220. 	h=h<<4;str++;
    221. 	if (*str>='0' && *str<='9') h+=(*str)-'0'; else if (*str>='A' && *str<='F') h+=10+(*str)-'A'; else if (*str>='a' && *str<='f') h+=10+(*str)-'a'; else return 0;
    222. 	h=h<<4;str++;
    223. 	if (*str>='0' && *str<='9') h+=(*str)-'0'; else if (*str>='A' && *str<='F') h+=10+(*str)-'A'; else if (*str>='a' && *str<='f') h+=10+(*str)-'a'; else return 0;
    224. 	return h;
    225. }
    226.  
    227. /* Parse the input text into an unescaped cstring, and populate item. */
    228. static const unsigned char firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
    229. static const char *parse_string(cJSON *item,const char *str)
    230. {
    231. 	const char *ptr = str+1;
    232.     char *ptr2;
    233.     char *out;
    234.     int len = 0;
    235.     unsigned uc,uc2;
    236.     
    237. 	if (*str != '\"')
    238.     {
    239.         ep=str;
    240.         return 0;
    241.     }  /* not a string! */
    242. 	
    243. 	while (*ptr!='\"' && *ptr && ++len) if (*ptr++ == '\\') ptr++;	/* Skip escaped quotes. */
    244. 	
    245. 	out=(char*)cJSON_malloc(len+1);	/* This is how long we need for the string, roughly. */
    246. 	if (!out) return 0;
    247. 	
    248. 	ptr=str+1;ptr2=out;
    249. 	while (*ptr!='\"' && *ptr)
    250. 	{
    251. 		if (*ptr!='\\') *ptr2++=*ptr++;
    252. 		else
    253. 		{
    254. 			ptr++;
    255. 			switch (*ptr)
    256. 			{
    257. 				case 'b': *ptr2++='\b';	break;
    258. 				case 'f': *ptr2++='\f';	break;
    259. 				case 'n': *ptr2++='\n';	break;
    260. 				case 'r': *ptr2++='\r';	break;
    261. 				case 't': *ptr2++='\t';	break;
    262. 				case 'u':	 /* transcode utf16 to utf8. */
    263. 					uc=parse_hex4(ptr+1);ptr+=4;	/* get the unicode char. */
    264.  
    265. 					if ((uc>=0xDC00 && uc<=0xDFFF) || uc==0)	break;	/* check for invalid.	*/
    266.  
    267. 					if (uc>=0xD800 && uc<=0xDBFF)	/* UTF16 surrogate pairs.	*/
    268. 					{
    269. 						if (ptr[1]!='\\' || ptr[2]!='u')	break;	/* missing second-half of surrogate.	*/
    270. 						uc2=parse_hex4(ptr+3);ptr+=6;
    271. 						if (uc2<0xDC00 || uc2>0xDFFF)		break;	/* invalid second-half of surrogate.	*/
    272. 						uc=0x10000 + (((uc&0x3FF)<<10) | (uc2&0x3FF));
    273. 					}
    274.  
    275. 					len=4;if (uc<0x80) len=1;else if (uc<0x800) len=2;else if (uc<0x10000) len=3; ptr2+=len;
    276. 					
    277. 					switch (len) {
    278. 						case 4: *--ptr2 =((uc | 0x80) & 0xBF); uc >>= 6;
    279. 						case 3: *--ptr2 =((uc | 0x80) & 0xBF); uc >>= 6;
    280. 						case 2: *--ptr2 =((uc | 0x80) & 0xBF); uc >>= 6;
    281. 						case 1: *--ptr2 =(uc | firstByteMark[len]);
    282. 					}
    283. 					ptr2+=len;
    284. 					break;
    285. 				default:  *ptr2++=*ptr; break;
    286. 			}
    287. 			ptr++;
    288. 		}
    289. 	}
    290. 	*ptr2=0;
    291. 	if (*ptr=='\"')
    292.         ptr++;
    293. 	item->valuestring=out;
    294. 	item->type=cJSON_String;
    295.     
    296. 	return ptr;
    297. }
    298.  
    299. /* Render the cstring provided to an escaped version that can be printed. */
    300. static char *print_string_ptr(const char *str,printbuffer *p)
    301. {
    302. 	const char *ptr;char *ptr2,*out;int len=0,flag=0;unsigned char token;
    303. 	
    304. 	for (ptr=str;*ptr;ptr++) flag|=((*ptr>0 && *ptr<32)||(*ptr=='\"')||(*ptr=='\\'))?1:0;
    305. 	if (!flag)
    306. 	{
    307. 		len=ptr-str;
    308. 		if (p) out=ensure(p,len+3);
    309. 		else		out=(char*)cJSON_malloc(len+3);
    310. 		if (!out) return 0;
    311. 		ptr2=out;*ptr2++='\"';
    312. 		strcpy(ptr2,str);
    313. 		ptr2[len]='\"';
    314. 		ptr2[len+1]=0;
    315. 		return out;
    316. 	}
    317. 	
    318. 	if (!str)
    319. 	{
    320. 		if (p)	out=ensure(p,3);
    321. 		else	out=(char*)cJSON_malloc(3);
    322. 		if (!out) return 0;
    323. 		strcpy(out,"\"\"");
    324. 		return out;
    325. 	}
    326. 	ptr=str;while ((token=*ptr) && ++len) {if (strchr("\"\\\b\f\n\r\t",token)) len++; else if (token<32) len+=5;ptr++;}
    327. 	
    328. 	if (p)	out=ensure(p,len+3);
    329. 	else	out=(char*)cJSON_malloc(len+3);
    330. 	if (!out) return 0;
    331.  
    332. 	ptr2=out;ptr=str;
    333. 	*ptr2++='\"';
    334. 	while (*ptr)
    335. 	{
    336. 		if ((unsigned char)*ptr>31 && *ptr!='\"' && *ptr!='\\') *ptr2++=*ptr++;
    337. 		else
    338. 		{
    339. 			*ptr2++='\\';
    340. 			switch (token=*ptr++)
    341. 			{
    342. 				case '\\':	*ptr2++='\\';	break;
    343. 				case '\"':	*ptr2++='\"';	break;
    344. 				case '\b':	*ptr2++='b';	break;
    345. 				case '\f':	*ptr2++='f';	break;
    346. 				case '\n':	*ptr2++='n';	break;
    347. 				case '\r':	*ptr2++='r';	break;
    348. 				case '\t':	*ptr2++='t';	break;
    349. 				default: sprintf(ptr2,"u%04x",token);ptr2+=5;	break;	/* escape and print */
    350. 			}
    351. 		}
    352. 	}
    353. 	*ptr2++='\"';*ptr2++=0;
    354. 	return out;
    355. }
    356. /* Invote print_string_ptr (which is useful) on an item. */
    357. static char *print_string(cJSON *item,printbuffer *p)	{return print_string_ptr(item->valuestring,p);}
    358.  
    359. /* Predeclare these prototypes. */
    360. static const char *parse_value(cJSON *item,const char *value);
    361. static char *print_value(cJSON *item,int depth,int fmt,printbuffer *p);
    362. static const char *parse_array(cJSON *item,const char *value);
    363. static char *print_array(cJSON *item,int depth,int fmt,printbuffer *p);
    364. static const char *parse_object(cJSON *item,const char *value);
    365. static char *print_object(cJSON *item,int depth,int fmt,printbuffer *p);
    366.  
    367. /* Utility to jump whitespace and cr/lf */
    368. static const char *skip(const char *in)
    369. {
    370.     while (in && *in && (unsigned char)*in<=32)
    371.         in++;
    372.     return in;
    373. }
    374.  
    375. /*
    376.     @description 将JSON字符串中多余的空格、换行符删去以免影响后面的解析。
    377.     @author chorm
    378.     @date 2020-01-03 15:22
    379. */
    380. static const char *get_pure_json_str(const char *in)
    381. {
    382.     int i = 0;
    383.     int j = 0;
    384.     char cur_char = 0;
    385.     char pre_char = 0;
    386.     char is_in_str = 0;
    387.     
    388.     if(in == NULL)
    389.         return in;
    390.     int len = 0;
    391.     const char *str = in;
    392.     i = 0;
    393.     while(*(str + i) != 0)
    394.     {
    395.         len++;
    396.         i++;
    397.     }
    398.  
    399.     char *json_pure = (char *)malloc(len);
    400.     if(json_pure == NULL)
    401.         return 0;
    402.     
    403.     for(i = 0,j = 0; i < len; i++)
    404.     {
    405.         cur_char = *(in + i);
    406.  
    407.         if(cur_char == 0)
    408.         {
    409.  
    410.         }
    411.         else if(cur_char == ' ' || cur_char == '\n' || cur_char == '\r')
    412.         {
    413.             if(is_in_str)
    414.             {
    415.                 //字符串中的空格和换行符不能删除
    416.                 *(json_pure + j++) = cur_char;
    417.             }
    418.         }
    419.         else
    420.         {
    421.             *(json_pure + j++) = cur_char;
    422.             if(cur_char == '"')
    423.             {
    424.                 if(pre_char != '\\')
    425.                 {
    426.                     is_in_str = !is_in_str;
    427.                 }
    428.             }
    429.         }
    430.  
    431.         pre_char = cur_char;
    432.     }
    433.  
    434.     return json_pure;
    435. }
    436.  
    437. /* Parse an object - create a new root, and populate. */
    438. cJSON *cJSON_ParseWithOpts(const char *value,const char **return_parse_end,int require_null_terminated)
    439. {
    440. 	const char *end = 0;
    441.     char *json_pure = NULL;
    442. 	cJSON *c = cJSON_New_Item();
    443. 	ep = 0;
    444. 	if (!c)
    445.         return 0; //memory fail
    446.  
    447.     json_pure = get_pure_json_str(value);
    448.     c->pure_json = json_pure;
    449. 	end = parse_value(c, skip(json_pure));
    450. 	if (!end)	{
    451.         cJSON_Delete(c);
    452.         return 0;
    453.     }  /* parse failure. ep is set. */
    454.  
    455. 	/* if we require null-terminated JSON without appended garbage, skip and then check for a null terminator */
    456. 	if (require_null_terminated) {
    457.         end=skip(end);
    458.         if (*end) {
    459.             cJSON_Delete(c);
    460.             ep=end;
    461.             return 0;
    462.         }
    463.     }
    464. 	if (return_parse_end)
    465.         *return_parse_end=end;
    466. 	return c;
    467. }
    468.  
    469. /* Default options for cJSON_Parse */
    470. cJSON *cJSON_Parse(const char *value) {return cJSON_ParseWithOpts(value,0,0);}
    471.  
    472. /* Render a cJSON item/entity/structure to text. */
    473. char *cJSON_Print(cJSON *item)				{return print_value(item,0,1,0);}
    474. char *cJSON_PrintUnformatted(cJSON *item)	{return print_value(item,0,0,0);}
    475.  
    476. char *cJSON_PrintBuffered(cJSON *item,int prebuffer,int fmt)
    477. {
    478. 	printbuffer p;
    479. 	p.buffer=(char*)cJSON_malloc(prebuffer);
    480. 	p.length=prebuffer;
    481. 	p.offset=0;
    482. 	return print_value(item,0,fmt,&p);
    483. 	return p.buffer;
    484. }
    485.  
    486.  
    487. /* Parser core - when encountering text, process appropriately. */
    488. static const char *parse_value(cJSON *item,const char *value)
    489. {
    490. 	if (!value)
    491.         return 0;   /* Fail on null. */
    492.  
    493.     if (!strncmp(value,"null",4))
    494.     {
    495.         item->type=cJSON_NULL;
    496.         return value+4;
    497.     }
    498.     
    499. 	if (!strncmp(value,"false",5)){
    500.         item->type=cJSON_False;
    501.         return value+5;
    502.     }
    503.     
    504. 	if (!strncmp(value,"true",4)){
    505.         item->type=cJSON_True;
    506.         item->valueint=1;
    507.         return value+4;
    508.     }
    509.     
    510. 	if (*value=='\"'){
    511.         return parse_string(item,value);
    512.     }
    513.     
    514. 	if (*value=='-' || (*value>='0' && *value<='9')){
    515.         return parse_number(item,value);
    516.     }
    517.     
    518. 	if (*value=='['){
    519.         return parse_array(item, value);
    520.     }
    521.     
    522. 	if (*value=='{'){
    523.         return parse_object(item,value);
    524.     }
    525.  
    526. 	ep=value;
    527.     return 0;	/* failure. */
    528. }
    529.  
    530. /* Render a value to text. */
    531. static char *print_value(cJSON *item, int depth, int fmt, printbuffer *p)
    532. {
    533. 	char *out = 0;
    534. 	if (!item) return 0;
    535. 	if (p)
    536. 	{
    537. 		switch ((item->type) & 255)
    538. 		{
    539. 		case cJSON_NULL: {out = ensure(p, 5);	if (out) strcpy(out, "null");	break; }
    540. 		case cJSON_False: {out = ensure(p, 6);	if (out) strcpy(out, "false");	break; }
    541. 		case cJSON_True: {out = ensure(p, 5);	if (out) strcpy(out, "true");	break; }
    542. 		case cJSON_Number:	out = print_number(item, p); break;
    543. 		case cJSON_String:	out = print_string(item, p); break;
    544. 		case cJSON_Array:	out = print_array(item, depth, fmt, p); break;
    545. 		case cJSON_Object:	out = print_object(item, depth, fmt, p); break;
    546. 		}
    547. 	}
    548. 	else
    549. 	{
    550. 		switch ((item->type) & 255)
    551. 		{
    552. 		case cJSON_NULL:	out = cJSON_strdup("null");	break;
    553. 		case cJSON_False:	out = cJSON_strdup("false"); break;
    554. 		case cJSON_True:	out = cJSON_strdup("true"); break;
    555. 		case cJSON_Number:	out = print_number(item, 0); break;
    556. 		case cJSON_String:	out = print_string(item, 0); break;
    557. 		case cJSON_Array:	out = print_array(item, depth, fmt, 0); break;
    558. 		case cJSON_Object:	out = print_object(item, depth, fmt, 0); break;
    559. 		}
    560. 	}
    561. 	return out;
    562. }
    563.  
    564.  
    565.  
    566. static const char *parse_array(cJSON *item, const char *value)
    567. {
    568. 	cJSON *child;
    569.  
    570. 	if (*value != '[')
    571. 	{
    572. 		ep = value;
    573. 		return 0;
    574. 	}
    575. 	/* not an array! */
    576.  
    577. 	item->type = cJSON_Array;
    578. 	value = skip(value + 1);
    579. 	if (*value == ']')
    580. 		return (value + 1); /* empty array. */
    581.  
    582. 	child = cJSON_New_Item();
    583. 	item->child = child;
    584. 	if (!item->child)
    585. 		return 0;        /* memory fail */
    586. 	value = skip(parse_value(child, skip(value))); // skip any spacing, get the value.
    587. 	if (!value)
    588. 		return 0;
    589.  
    590. 	while (*value == ',')
    591. 	{
    592. 		cJSON *new_item;
    593. 		if (!(new_item = cJSON_New_Item()))
    594. 			return 0;   /* memory fail */
    595. 		child->next = new_item;
    596. 		new_item->prev = child;
    597. 		child = new_item;
    598. 		value = skip(parse_value(child, skip(value + 1)));
    599. 		if (!value)
    600. 			return 0;   /* memory fail */
    601. 		//JSON数组一直都是以子节点的形式存在。
    602. 	}
    603.  
    604. 	if (*value == ']')
    605. 		return (value + 1); /* end of array */
    606. 	ep = value;
    607.  
    608. 	return 0;	/* malformed. */
    609. }
    610.  
    611.  
    612. //Render an array to text 
    613. static char *print_array(cJSON *item, int depth, int fmt, printbuffer * p)
    614. {
    615. 	char **entries;
    616. 	char *out = 0, *ptr, *ret; int len = 5;
    617. 	cJSON *child = item->child;
    618. 	int numentries = 0, i = 0, fail = 0;
    619. 	size_t tmplen = 0;
    620.  
    621. 	/* How many entries in the array? */
    622. 	while (child) numentries++, child = child->next;
    623. 	/* Explicitly handle numentries==0 */
    624. 	if (!numentries)
    625. 	{
    626. 		if (p)	out = ensure(p, 3);
    627. 		else	out = (char*)cJSON_malloc(3);
    628. 		if (out) strcpy(out, "[]");
    629. 		return out;
    630. 	}
    631.  
    632. 	if (p)
    633. 	{
    634. 		/* Compose the output array. */
    635. 		i = p->offset;
    636. 		ptr = ensure(p, 1); if (!ptr) return 0;	*ptr = '[';	p->offset++;
    637. 		child = item->child;
    638. 		while (child && !fail)
    639. 		{
    640. 			print_value(child, depth + 1, fmt, p);
    641. 			p->offset = update(p);
    642. 			if (child->next) { len = fmt ? 2 : 1; ptr = ensure(p, len + 1); if (!ptr) return 0; *ptr++ = ','; if (fmt)*ptr++ = ' '; *ptr = 0; p->offset += len; }
    643. 			child = child->next;
    644. 		}
    645. 		ptr = ensure(p, 2); if (!ptr) return 0;	*ptr++ = ']'; *ptr = 0;
    646. 		out = (p->buffer) + i;
    647. 	}
    648. 	else
    649. 	{
    650. 		/* Allocate an array to hold the values for each */
    651. 		entries = (char**)cJSON_malloc(numentries * sizeof(char*));
    652. 		if (!entries) return 0;
    653. 		memset(entries, 0, numentries * sizeof(char*));
    654. 		/* Retrieve all the results: */
    655. 		child = item->child;
    656. 		while (child && !fail)
    657. 		{
    658. 			ret = print_value(child, depth + 1, fmt, 0);
    659. 			entries[i++] = ret;
    660. 			if (ret) len += strlen(ret) + 2 + (fmt ? 1 : 0); else fail = 1;
    661. 			child = child->next;
    662. 		}
    663.  
    664. 		/* If we didn't fail, try to malloc the output string */
    665. 		if (!fail)	out = (char*)cJSON_malloc(len);
    666. 		/* If that fails, we fail. */
    667. 		if (!out) fail = 1;
    668.  
    669. 		/* Handle failure. */
    670. 		if (fail)
    671. 		{
    672. 			for (i = 0; i < numentries; i++) if (entries[i]) cJSON_free(entries[i]);
    673. 			cJSON_free(entries);
    674. 			return 0;
    675. 		}
    676.  
    677. 		/* Compose the output array. */
    678. 		*out = '[';
    679. 		ptr = out + 1; *ptr = 0;
    680. 		for (i = 0; i < numentries; i++)
    681. 		{
    682. 			tmplen = strlen(entries[i]); memcpy(ptr, entries[i], tmplen); ptr += tmplen;
    683. 			if (i != numentries - 1) { *ptr++ = ','; if (fmt)*ptr++ = ' '; *ptr = 0; }
    684. 			cJSON_free(entries[i]);
    685. 		}
    686. 		cJSON_free(entries);
    687. 		*ptr++ = ']'; *ptr++ = 0;
    688. 	}
    689. 	return out;
    690. }
    691.  
    692.  
    693. /* Build an object from the text. */
    694. static const char *parse_object(cJSON *item,const char *value)
    695. {
    696. 	cJSON *child;
    697. 	if(*value != '{')
    698.     {
    699.         ep=value;
    700.         return 0;
    701.     }    /* not an object! */
    702. 	
    703. 	item->type = cJSON_Object;
    704. 	value = skip(value+1);
    705. 	if (*value=='}')
    706.         return value+1; /* empty array. */
    707. 	
    708. 	item->child=child=cJSON_New_Item();
    709. 	if (!item->child)
    710.         return 0; //memory failed.
    711. 	value = skip(parse_string(child, skip(value))); //get 'key name'.
    712. 	if (!value)
    713.         return 0; //parse string failed.
    714. 	child->string = child->valuestring;
    715.     child->valuestring = 0;
    716. 	if (*value != ':')
    717.     {
    718.         ep=value;
    719.         return 0;
    720.     } //fail.
    721.  
    722.     value = skip(parse_value(child, skip(value+1)));	/* skip any spacing, get the value. */
    723. 	if (!value)
    724.         return 0;
    725. 	
    726. 	while (*value == ',')
    727. 	{
    728. 		cJSON *new_item;
    729. 		if (!(new_item = cJSON_New_Item()))
    730.             return 0; /* memory fail */
    731. 		child->next = new_item;
    732.         new_item->prev = child;
    733.         child = new_item;
    734. 		value = skip(parse_string(child, skip(value+1)));
    735. 		if (!value)
    736.             return 0;
    737. 		child->string = child->valuestring;
    738.         child->valuestring = 0;
    739. 		if (*value != ':')
    740.         {
    741.             ep = value;
    742.             return 0;
    743.         } //fail.
    744. 		value = skip(parse_value(child, skip(value+1)));	/* skip any spacing, get the value. */
    745. 		if (!value)
    746.             return 0;
    747. 	}
    748. 	
    749. 	if (*value == '}')
    750.         return value + 1; /* end of array */
    751.     
    752. 	ep = value;
    753.     
    754.     return 0;	/* malformed. */
    755. }
    756.  
    757. /* Render an object to text. */
    758. static char *print_object(cJSON *item,int depth,int fmt,printbuffer *p)
    759. {
    760. 	char **entries=0,**names=0;
    761. 	char *out=0,*ptr,*ret,*str;int len=7,i=0,j;
    762. 	cJSON *child=item->child;
    763. 	int numentries=0,fail=0;
    764. 	size_t tmplen=0;
    765. 	/* Count the number of entries. */
    766. 	while (child) numentries++,child=child->next;
    767. 	/* Explicitly handle empty object case */
    768. 	if (!numentries)
    769. 	{
    770. 		if (p) out=ensure(p,fmt?depth+4:3);
    771. 		else	out=(char*)cJSON_malloc(fmt?depth+4:3);
    772. 		if (!out)	return 0;
    773. 		ptr=out;*ptr++='{';
    774. 		if (fmt) {*ptr++='\n';for (i=0;i-1;i++) *ptr++='\t';}
    775. 		*ptr++='}';*ptr++=0;
    776. 		return out;
    777. 	}
    778. 	if (p)
    779. 	{
    780. 		/* Compose the output: */
    781. 		i=p->offset;
    782. 		len=fmt?2:1;	ptr=ensure(p,len+1);	if (!ptr) return 0;
    783. 		*ptr++='{';	if (fmt) *ptr++='\n';	*ptr=0;	p->offset+=len;
    784. 		child=item->child;depth++;
    785. 		while (child)
    786. 		{
    787. 			if (fmt)
    788. 			{
    789. 				ptr=ensure(p,depth);	if (!ptr) return 0;
    790. 				for (j=0;j'\t';
    791. 				p->offset+=depth;
    792. 			}
    793. 			print_string_ptr(child->string,p);
    794. 			p->offset=update(p);
    795. 			
    796. 			len=fmt?2:1;
    797. 			ptr=ensure(p,len);	if (!ptr) return 0;
    798. 			*ptr++=':';if (fmt) *ptr++='\t';
    799. 			p->offset+=len;
    800. 			
    801. 			print_value(child,depth,fmt,p);
    802. 			p->offset=update(p);
    803.  
    804. 			len=(fmt?1:0)+(child->next?1:0);
    805. 			ptr=ensure(p,len+1); if (!ptr) return 0;
    806. 			if (child->next) *ptr++=',';
    807. 			if (fmt) *ptr++='\n';*ptr=0;
    808. 			p->offset+=len;
    809. 			child=child->next;
    810. 		}
    811. 		ptr=ensure(p,fmt?(depth+1):2);	 if (!ptr) return 0;
    812. 		if (fmt)	for (i=0;i-1;i++) *ptr++='\t';
    813. 		*ptr++='}';*ptr=0;
    814. 		out=(p->buffer)+i;
    815. 	}
    816. 	else
    817. 	{
    818. 		/* Allocate space for the names and the objects */
    819. 		entries=(char**)cJSON_malloc(numentries*sizeof(char*));
    820. 		if (!entries) return 0;
    821. 		names=(char**)cJSON_malloc(numentries*sizeof(char*));
    822. 		if (!names) {cJSON_free(entries);return 0;}
    823. 		memset(entries,0,sizeof(char*)*numentries);
    824. 		memset(names,0,sizeof(char*)*numentries);
    825.  
    826. 		/* Collect all the results into our arrays: */
    827. 		child=item->child;depth++;if (fmt) len+=depth;
    828. 		while (child)
    829. 		{
    830. 			names[i]=str=print_string_ptr(child->string,0);
    831. 			entries[i++]=ret=print_value(child,depth,fmt,0);
    832. 			if (str && ret) len+=strlen(ret)+strlen(str)+2+(fmt?2+depth:0); else fail=1;
    833. 			child=child->next;
    834. 		}
    835. 		
    836. 		/* Try to allocate the output string */
    837. 		if (!fail)	out=(char*)cJSON_malloc(len);
    838. 		if (!out) fail=1;
    839.  
    840. 		/* Handle failure */
    841. 		if (fail)
    842. 		{
    843. 			for (i=0;iif (names[i]) cJSON_free(names[i]);if (entries[i]) cJSON_free(entries[i]);}
    844. 			cJSON_free(names);cJSON_free(entries);
    845. 			return 0;
    846. 		}
    847. 		
    848. 		/* Compose the output: */
    849. 		*out='{';ptr=out+1;if (fmt)*ptr++='\n';*ptr=0;
    850. 		for (i=0;i
    851. 		{
    852. 			if (fmt) for (j=0;j'\t';
    853. 			tmplen=strlen(names[i]);memcpy(ptr,names[i],tmplen);ptr+=tmplen;
    854. 			*ptr++=':';if (fmt) *ptr++='\t';
    855. 			strcpy(ptr,entries[i]);ptr+=strlen(entries[i]);
    856. 			if (i!=numentries-1) *ptr++=',';
    857. 			if (fmt) *ptr++='\n';*ptr=0;
    858. 			cJSON_free(names[i]);cJSON_free(entries[i]);
    859. 		}
    860. 		
    861. 		cJSON_free(names);cJSON_free(entries);
    862. 		if (fmt) for (i=0;i-1;i++) *ptr++='\t';
    863. 		*ptr++='}';*ptr++=0;
    864. 	}
    865. 	return out;	
    866. }
    867.  
    868. /* Get Array size/item / object item. */
    869. int cJSON_GetArraySize(cJSON *array)
    870. {
    871.     cJSON *c = array->child;
    872.     int i=0;
    873.     while(c)
    874.         i++,c=c->next;
    875.     return i;
    876. }
    877.  
    878. cJSON *cJSON_GetArrayItem(cJSON *array, int item)
    879. {
    880.     cJSON *c = array->child;
    881.     while (c && item>0)
    882.         item--,c=c->next;
    883.     return c;
    884. }
    885.  
    886. cJSON *cJSON_GetObjectItem(cJSON *object,const char *string)
    887. {
    888.     cJSON *c = object->child;
    889.     while (c && cJSON_strcasecmp(c->string,string))
    890.         c=c->next;
    891.     return c;
    892. }
    893.  
    894. /* Utility for array list handling. */
    895. static void suffix_object(cJSON *prev,cJSON *item) {prev->next=item;item->prev=prev;}
    896. /* Utility for handling references. */
    897. static cJSON *create_reference(cJSON *item) {cJSON *ref=cJSON_New_Item();if (!ref) return 0;memcpy(ref,item,sizeof(cJSON));ref->string=0;ref->type|=cJSON_IsReference;ref->next=ref->prev=0;return ref;}
    898.  
    899. /* Add item to array/object. */
    900. void   cJSON_AddItemToArray(cJSON *array, cJSON *item)						{cJSON *c=array->child;if (!item) return; if (!c) {array->child=item;} else {while (c && c->next) c=c->next; suffix_object(c,item);}}
    901. void   cJSON_AddItemToObject(cJSON *object,const char *string,cJSON *item)	{if (!item) return; if (item->string) cJSON_free(item->string);item->string=cJSON_strdup(string);cJSON_AddItemToArray(object,item);}
    902. void   cJSON_AddItemToObjectCS(cJSON *object,const char *string,cJSON *item)	{if (!item) return; if (!(item->type&cJSON_StringIsConst) && item->string) cJSON_free(item->string);item->string=(char*)string;item->type|=cJSON_StringIsConst;cJSON_AddItemToArray(object,item);}
    903. void	cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item)						{cJSON_AddItemToArray(array,create_reference(item));}
    904. void	cJSON_AddItemReferenceToObject(cJSON *object,const char *string,cJSON *item)	{cJSON_AddItemToObject(object,string,create_reference(item));}
    905.  
    906. cJSON *cJSON_DetachItemFromArray(cJSON *array,int which)			{cJSON *c=array->child;while (c && which>0) c=c->next,which--;if (!c) return 0;
    907. 	if (c->prev) c->prev->next=c->next;if (c->next) c->next->prev=c->prev;if (c==array->child) array->child=c->next;c->prev=c->next=0;return c;}
    908. void   cJSON_DeleteItemFromArray(cJSON *array,int which)			{cJSON_Delete(cJSON_DetachItemFromArray(array,which));}
    909. cJSON *cJSON_DetachItemFromObject(cJSON *object,const char *string) {int i=0;cJSON *c=object->child;while (c && cJSON_strcasecmp(c->string,string)) i++,c=c->next;if (c) return cJSON_DetachItemFromArray(object,i);return 0;}
    910. void   cJSON_DeleteItemFromObject(cJSON *object,const char *string) {cJSON_Delete(cJSON_DetachItemFromObject(object,string));}
    911.  
    912. /* Replace array/object items with new ones. */
    913. void   cJSON_InsertItemInArray(cJSON *array,int which,cJSON *newitem)		{cJSON *c=array->child;while (c && which>0) c=c->next,which--;if (!c) {cJSON_AddItemToArray(array,newitem);return;}
    914. 	newitem->next=c;newitem->prev=c->prev;c->prev=newitem;if (c==array->child) array->child=newitem; else newitem->prev->next=newitem;}
    915. void   cJSON_ReplaceItemInArray(cJSON *array,int which,cJSON *newitem)		{cJSON *c=array->child;while (c && which>0) c=c->next,which--;if (!c) return;
    916. 	newitem->next=c->next;newitem->prev=c->prev;if (newitem->next) newitem->next->prev=newitem;
    917. 	if (c==array->child) array->child=newitem; else newitem->prev->next=newitem;c->next=c->prev=0;cJSON_Delete(c);}
    918. void   cJSON_ReplaceItemInObject(cJSON *object,const char *string,cJSON *newitem){int i=0;cJSON *c=object->child;while(c && cJSON_strcasecmp(c->string,string))i++,c=c->next;if(c){newitem->string=cJSON_strdup(string);cJSON_ReplaceItemInArray(object,i,newitem);}}
    919.  
    920. /* Create basic types: */
    921. cJSON *cJSON_CreateNull(void)					{cJSON *item=cJSON_New_Item();if(item)item->type=cJSON_NULL;return item;}
    922. cJSON *cJSON_CreateTrue(void)					{cJSON *item=cJSON_New_Item();if(item)item->type=cJSON_True;return item;}
    923. cJSON *cJSON_CreateFalse(void)					{cJSON *item=cJSON_New_Item();if(item)item->type=cJSON_False;return item;}
    924. cJSON *cJSON_CreateBool(int b)					{cJSON *item=cJSON_New_Item();if(item)item->type=b?cJSON_True:cJSON_False;return item;}
    925. cJSON *cJSON_CreateNumber(double num)			{cJSON *item=cJSON_New_Item();if(item){item->type=cJSON_Number;item->valuedouble=num;item->valueint=(int)num;}return item;}
    926. cJSON *cJSON_CreateString(const char *string)	{cJSON *item=cJSON_New_Item();if(item){item->type=cJSON_String;item->valuestring=cJSON_strdup(string);}return item;}
    927. cJSON *cJSON_CreateArray(void)					{cJSON *item=cJSON_New_Item();if(item)item->type=cJSON_Array;return item;}
    928. cJSON *cJSON_CreateObject(void)					{cJSON *item=cJSON_New_Item();if(item)item->type=cJSON_Object;return item;}
    929.  
    930. /* Create Arrays: */
    931. cJSON *cJSON_CreateIntArray(const int *numbers,int count)		{int i;cJSON *n=0,*p=0,*a=cJSON_CreateArray();for(i=0;a && iif(!i)a->child=n;else suffix_object(p,n);p=n;}return a;}
    932. cJSON *cJSON_CreateFloatArray(const float *numbers,int count)	{int i;cJSON *n=0,*p=0,*a=cJSON_CreateArray();for(i=0;a && iif(!i)a->child=n;else suffix_object(p,n);p=n;}return a;}
    933. cJSON *cJSON_CreateDoubleArray(const double *numbers,int count)	{int i;cJSON *n=0,*p=0,*a=cJSON_CreateArray();for(i=0;a && iif(!i)a->child=n;else suffix_object(p,n);p=n;}return a;}
    934. cJSON *cJSON_CreateStringArray(const char **strings,int count)	{int i;cJSON *n=0,*p=0,*a=cJSON_CreateArray();for(i=0;a && iif(!i)a->child=n;else suffix_object(p,n);p=n;}return a;}
    935.  
    936. /* Duplication */
    937. cJSON *cJSON_Duplicate(cJSON *item,int recurse)
    938. {
    939. 	cJSON *newitem,*cptr,*nptr=0,*newchild;
    940. 	/* Bail on bad ptr */
    941. 	if (!item) return 0;
    942. 	/* Create new item */
    943. 	newitem=cJSON_New_Item();
    944. 	if (!newitem) return 0;
    945. 	/* Copy over all vars */
    946. 	newitem->type=item->type&(~cJSON_IsReference),newitem->valueint=item->valueint,newitem->valuedouble=item->valuedouble;
    947. 	if (item->valuestring)	{newitem->valuestring=cJSON_strdup(item->valuestring);	if (!newitem->valuestring)	{cJSON_Delete(newitem);return 0;}}
    948. 	if (item->string)		{newitem->string=cJSON_strdup(item->string);			if (!newitem->string)		{cJSON_Delete(newitem);return 0;}}
    949. 	/* If non-recursive, then we're done! */
    950. 	if (!recurse) return newitem;
    951. 	/* Walk the ->next chain for the child. */
    952. 	cptr=item->child;
    953. 	while (cptr)
    954. 	{
    955. 		newchild=cJSON_Duplicate(cptr,1);		/* Duplicate (with recurse) each item in the ->next chain */
    956. 		if (!newchild) {cJSON_Delete(newitem);return 0;}
    957. 		if (nptr)	{nptr->next=newchild,newchild->prev=nptr;nptr=newchild;}	/* If newitem->child already set, then crosswire ->prev and ->next and move on */
    958. 		else		{newitem->child=newchild;nptr=newchild;}					/* Set newitem->child and move to it */
    959. 		cptr=cptr->next;
    960. 	}
    961. 	return newitem;
    962. }
    963.  
    964. void cJSON_Minify(char *json)
    965. {
    966. 	char *into=json;
    967. 	while (*json)
    968. 	{
    969. 		if (*json==' ') json++;
    970. 		else if (*json=='\t') json++;	/* Whitespace characters. */
    971. 		else if (*json=='\r') json++;
    972. 		else if (*json=='\n') json++;
    973. 		else if (*json=='/' && json[1]=='/')  while (*json && *json!='\n') json++;	/* double-slash comments, to end of line. */
    974. 		else if (*json=='/' && json[1]=='*') {while (*json && !(*json=='*' && json[1]=='/')) json++;json+=2;}	/* multiline comments. */
    975. 		else if (*json=='\"'){*into++=*json++;while (*json && *json!='\"'){if (*json=='\\') *into++=*json++;*into++=*json++;}*into++=*json++;} /* string literals, which are \" sensitive. */
    976. 		else *into++=*json++;			/* All other characters. */
    977. 	}
    978. 	*into=0;	/* and null-terminate. */
    979. }

    3、cJSON.h

    1. /*
    2.   Copyright (c) 2009 Dave Gamble
    3.  
    4.   Permission is hereby granted, free of charge, to any person obtaining a copy
    5.   of this software and associated documentation files (the "Software"), to deal
    6.   in the Software without restriction, including without limitation the rights
    7.   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    8.   copies of the Software, and to permit persons to whom the Software is
    9.   furnished to do so, subject to the following conditions:
    10.  
    11.   The above copyright notice and this permission notice shall be included in
    12.   all copies or substantial portions of the Software.
    13.  
    14.   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    15.   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    16.   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    17.   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    18.   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    19.   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    20.   THE SOFTWARE.
    21. */
    22.  
    23. #ifndef cJSON__h
    24. #define cJSON__h
    25.  
    26. #ifdef __cplusplus
    27. extern "C"
    28. {
    29. #endif
    30.  
    31. /* cJSON Types: */
    32. #define cJSON_False 0
    33. #define cJSON_True 1
    34. #define cJSON_NULL 2
    35. #define cJSON_Number 3
    36. #define cJSON_String 4
    37. #define cJSON_Array 5
    38. #define cJSON_Object 6
    39. 	
    40. #define cJSON_IsReference 256
    41. #define cJSON_StringIsConst 512
    42.  
    43. /* The cJSON structure: */
    44. typedef struct cJSON {
    45. 	struct cJSON *next,*prev;	/* next/prev allow you to walk array/object chains. Alternatively, use GetArraySize/GetArrayItem/GetObjectItem */
    46. 	struct cJSON *child;		/* An array or object item will have a child pointer pointing to a chain of the items in the array/object. */
    47.  
    48. 	int type;					/* The type of the item, as above. */
    49.  
    50. 	char *valuestring;			/* The item's string, if type==cJSON_String */
    51. 	int valueint;				/* The item's number, if type==cJSON_Number */
    52. 	double valuedouble;			/* The item's number, if type==cJSON_Number */
    53.  
    54. 	char *string;				/* The item's name string, if this item is the child of, or is in the list of subitems of an object. */
    55.     char *pure_json;            /*chorm add it at 2020-01-03 17:39.*/
    56. } cJSON;
    57.  
    58. typedef struct cJSON_Hooks {
    59.       void *(*malloc_fn)(size_t sz);
    60.       void (*free_fn)(void *ptr);
    61. } cJSON_Hooks;
    62.  
    63. /* Supply malloc, realloc and free functions to cJSON */
    64. extern void cJSON_InitHooks(cJSON_Hooks* hooks);
    65.  
    66.  
    67. /* Supply a block of JSON, and this returns a cJSON object you can interrogate. Call cJSON_Delete when finished. */
    68. extern cJSON *cJSON_Parse(const char *value);
    69. /* Render a cJSON entity to text for transfer/storage. Free the char* when finished. */
    70. extern char  *cJSON_Print(cJSON *item);
    71. /* Render a cJSON entity to text for transfer/storage without any formatting. Free the char* when finished. */
    72. extern char  *cJSON_PrintUnformatted(cJSON *item);
    73. /* 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 */
    74. extern char *cJSON_PrintBuffered(cJSON *item,int prebuffer,int fmt);
    75. /* Delete a cJSON entity and all subentities. */
    76. extern void   cJSON_Delete(cJSON *c);
    77.  
    78. /* Returns the number of items in an array (or object). */
    79. extern int	  cJSON_GetArraySize(cJSON *array);
    80. /* Retrieve item number "item" from array "array". Returns NULL if unsuccessful. */
    81. extern cJSON *cJSON_GetArrayItem(cJSON *array,int item);
    82. /* Get item "string" from object. Case insensitive. */
    83. extern cJSON *cJSON_GetObjectItem(cJSON *object,const char *string);
    84.  
    85. /* 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 cJSON_Parse() succeeds. */
    86. extern const char *cJSON_GetErrorPtr(void);
    87. 	
    88. /* These calls create a cJSON item of the appropriate type. */
    89. extern cJSON *cJSON_CreateNull(void);
    90. extern cJSON *cJSON_CreateTrue(void);
    91. extern cJSON *cJSON_CreateFalse(void);
    92. extern cJSON *cJSON_CreateBool(int b);
    93. extern cJSON *cJSON_CreateNumber(double num);
    94. extern cJSON *cJSON_CreateString(const char *string);
    95. extern cJSON *cJSON_CreateArray(void);
    96. extern cJSON *cJSON_CreateObject(void);
    97.  
    98. /* These utilities create an Array of count items. */
    99. extern cJSON *cJSON_CreateIntArray(const int *numbers,int count);
    100. extern cJSON *cJSON_CreateFloatArray(const float *numbers,int count);
    101. extern cJSON *cJSON_CreateDoubleArray(const double *numbers,int count);
    102. extern cJSON *cJSON_CreateStringArray(const char **strings,int count);
    103.  
    104. /* Append item to the specified array/object. */
    105. extern void cJSON_AddItemToArray(cJSON *array, cJSON *item);
    106. extern void	cJSON_AddItemToObject(cJSON *object,const char *string,cJSON *item);
    107. extern void	cJSON_AddItemToObjectCS(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 */
    108. /* 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 cJSON. */
    109. extern void cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item);
    110. extern void	cJSON_AddItemReferenceToObject(cJSON *object,const char *string,cJSON *item);
    111.  
    112. /* Remove/Detatch items from Arrays/Objects. */
    113. extern cJSON *cJSON_DetachItemFromArray(cJSON *array,int which);
    114. extern void   cJSON_DeleteItemFromArray(cJSON *array,int which);
    115. extern cJSON *cJSON_DetachItemFromObject(cJSON *object,const char *string);
    116. extern void   cJSON_DeleteItemFromObject(cJSON *object,const char *string);
    117. 	
    118. /* Update array items. */
    119. extern void cJSON_InsertItemInArray(cJSON *array,int which,cJSON *newitem);	/* Shifts pre-existing items to the right. */
    120. extern void cJSON_ReplaceItemInArray(cJSON *array,int which,cJSON *newitem);
    121. extern void cJSON_ReplaceItemInObject(cJSON *object,const char *string,cJSON *newitem);
    122.  
    123. /* Duplicate a cJSON item */
    124. extern cJSON *cJSON_Duplicate(cJSON *item,int recurse);
    125. /* Duplicate will create a new, identical cJSON item to the one you pass, in new memory that will
    126. need to be released. With recurse!=0, it will duplicate any children connected to the item.
    127. The item->next and ->prev pointers are always zero on return from Duplicate. */
    128.  
    129. /* ParseWithOpts allows you to require (and check) that the JSON is null terminated, and to retrieve the pointer to the final byte parsed. */
    130. extern cJSON *cJSON_ParseWithOpts(const char *value,const char **return_parse_end,int require_null_terminated);
    131.  
    132. extern void cJSON_Minify(char *json);
    133.  
    134. /* Macros for creating things quickly. */
    135. #define cJSON_AddNullToObject(object,name)		cJSON_AddItemToObject(object, name, cJSON_CreateNull())
    136. #define cJSON_AddTrueToObject(object,name)		cJSON_AddItemToObject(object, name, cJSON_CreateTrue())
    137. #define cJSON_AddFalseToObject(object,name)		cJSON_AddItemToObject(object, name, cJSON_CreateFalse())
    138. #define cJSON_AddBoolToObject(object,name,b)	cJSON_AddItemToObject(object, name, cJSON_CreateBool(b))
    139. #define cJSON_AddNumberToObject(object,name,n)	cJSON_AddItemToObject(object, name, cJSON_CreateNumber(n))
    140. #define cJSON_AddStringToObject(object,name,s)	cJSON_AddItemToObject(object, name, cJSON_CreateString(s))
    141.  
    142. /* When assigning an integer value, it needs to be propagated to valuedouble too. */
    143. #define cJSON_SetIntValue(object,val)			((object)?(object)->valueint=(object)->valuedouble=(val):(val))
    144. #define cJSON_SetNumberValue(object,val)		((object)?(object)->valueint=(object)->valuedouble=(val):(val))
    145.  
    146. #ifdef __cplusplus
    147. }
    148. #endif
    149.  
    150. #endif


     

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  • 原文地址：https://blog.csdn.net/u012841414/article/details/127867715