C语言实现手写JSON解析的方法

实现手写JSON解析的方法需要深入理解JSON的语法规则，并能够解析JSON字符串，提取其中的键值对和嵌套的JSON对象。以下是一个简单的C语言实现手写JSON解析的示例代码：

#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
  
// 定义JSON对象结构体  
typedef struct json_object {  
    char *key;  
    char *value;  
    struct json_object *next;  
} json_object;  
  
// 定义JSON数组结构体  
typedef struct json_array {  
    json_object *objects;  
    int length;  
} json_array;  
  
// 解析JSON字符串，返回JSON对象链表  
json_object *parse_json(char *json) {  
    json_object *root = NULL;  
    json_object *object = NULL;  
    char *key = NULL;  
    char *value = NULL;  
    int depth = 0;  
    int i = 0;  
    while (json[i] != '\0') {  
        if (json[i] == '}') {  
            depth--;  
            if (depth == 0) {  
                if (root == NULL) {  
                    root = object;  
                } else {  
                    json_object *temp = root;  
                    while (temp->next != NULL) {  
                        temp = temp->next;  
                    }  
                    temp->next = object;  
                }  
                object = NULL;  
            }  
        } else if (json[i] == '{') {  
            depth++;  
            object = (json_object*)malloc(sizeof(json_object));  
            object->key = NULL;  
            object->value = NULL;  
            object->next = NULL;  
        } else if (json[i] == '\"') {  
            int j = i + 1;  
            while (1) {  
                if (json[j] == '\\') {  
                    j++;  
                } else if (json[j] == '\"') {  
                    break;  
                } else {  
                    j++;  
                }  
            }  
            value = (char*)malloc(j - i - 1);  
            strncpy(value, json + i + 1, j - i - 2);  
            value[j - i - 2] = '\0';  
        } else if (json[i] == ':') {  
            key = value;  
            value = NULL;  
        } else if (json[i] == ',') {  
            if (key != NULL && object != NULL) {  
                object->key = key;  
                object->value = value;  
                object->next = (json_object*)malloc(sizeof(json_object));  
                object = object->next;  
                object->key = NULL;  
                object->value = NULL;  
            } else {  
                break;  
            }  
        } else if (depth == 0 && json[i] != ' ') {  
            value = (char*)malloc(strlen("null") + 1);  
            strcpy(value, "null");  
        } else if (depth == 1 && json[i] != ' ') {  
            break;  
        } else {  
            i++;  
        }  
        i++;  
    }  
    return root;  
}