#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>

#define BOT_ADDRESS "https://api.telegram.org/bot803596633:f1thviAAEnIIWOo6zdVcp6wwhQ5-km3UsoY" // тута ваш токен
#define GET_METHOD_READ_SIZE 128
#define GET_METHOD_WRITE_SIZE 128

typedef struct {
    size_t size;
    char *text;
} json_message;

//////////////////////////// здесь принимаются сообщения //////////////////////////
size_t read_message(void *raw_message, size_t size, size_t nmemb, void *dest) 
{
    size_t real_size = size * nmemb;
    json_message* dest_message = (json_message*) dest;
    dest_message->text = realloc(dest_message->text, dest_message->size + real_size + 1);
    if(dest_message->text == NULL)
     {
       printf("Error: Маловато памяти.\n");
       return 0;
     }

    memcpy(&(dest_message->text[dest_message->size]), raw_message, real_size);
    dest_message->size += real_size;
    dest_message->text[dest_message->size] = '\0';
    return real_size;
}

///////////////////// функция нужна curl`у для отправки сообщений/////////////////////
size_t emp_function(void *no_use, size_t size, size_t nmemb, void *null) 
{
   no_use = no_use; null = null;
   return size * nmemb;
}

//////////////////////////// здесь отправляются сообщения //////////////////////////
void sendMessage(char *chat_id) 
{ 
  int result;
  char GET_write[GET_METHOD_WRITE_SIZE] = {0,};
  snprintf(GET_write, GET_METHOD_WRITE_SIZE - 1, "%s/sendMessage?chat_id=%s&text=Reciv 'w' OK!", BOT_ADDRESS, chat_id); // если отправляете что-то длинное, то увеличить GET_METHOD_WRITE_SIZE
printf("LenGET_write:%d_END\n", (int)strlen(GET_write));  
  CURL *write_handle = curl_easy_init();
  curl_easy_setopt(write_handle, CURLOPT_URL, GET_write);
  curl_easy_setopt(write_handle, CURLOPT_WRITEFUNCTION, emp_function);
  curl_easy_setopt(write_handle, CURLOPT_READDATA, NULL);
  result = curl_easy_perform(write_handle);
  curl_easy_cleanup(write_handle);
  if(result != 0) printf("\nError cURL_2:%d\n", result);
}

///////////////////////////////////////////////////////////////////////////////////
int main()
{
    int result;
    json_message in_message = {0, NULL};
    unsigned long update_id = 0;  
    curl_global_init(CURL_GLOBAL_ALL);
    char GET_read[GET_METHOD_READ_SIZE] = {0,};
    printf("START\n");

    while (1)
     {
       in_message.text = (char*)malloc(1 * sizeof(char));
       in_message.text[0] = '\0';

       snprintf(GET_read, GET_METHOD_READ_SIZE - 1, "%s/getUpdates?limit=1&offset=%lu&timeout=10", BOT_ADDRESS, update_id); // обновления каждые 10 секунд (timeout=10)
       CURL *read_handle = curl_easy_init();
       curl_easy_setopt(read_handle, CURLOPT_URL, GET_read);
       curl_easy_setopt(read_handle, CURLOPT_WRITEFUNCTION, read_message);
       curl_easy_setopt(read_handle, CURLOPT_WRITEDATA, &in_message);
       result = curl_easy_perform(read_handle);
       curl_easy_cleanup(read_handle);
       if(result != 0) printf("\nError cURL_1:%d\n", result);
       
       update_id = 0;
 
       /////////////////////////// read update_id ///////////////////////////////
       char *p = NULL;
       if((p = strstr(in_message.text, "update_id\":")) != NULL) 
        {
          update_id = strtoul(p + 11, NULL, 0);
          printf("MYupdate_id:%lu_END\n\n", update_id);
        }  
        
       if(update_id != 0) update_id++; 
        
       /////////////////////////// read chat_id ///////////////////////////////
       char chat_id[16] = {0,};
       if((p = strstr(in_message.text, "chat\":{\"id\":")) != NULL) 
        {
          memccpy(chat_id, p + 12, ',', 15); 
          chat_id[strlen(chat_id) - 1] = 0;
        }        
       
printf("MYChat_id:%s_END\n", chat_id);       
       
       //////////////////////////// read msag  ////////////////////////////////
       char msg_text[16] = {0,}; // если будут приходить сообщения длинней 15 симв., тогда увеличить буфер. Ну или калок/малок-реалок)))
       if((p = strstr(in_message.text, "text\":\"")) != NULL) 
        {
          memccpy(msg_text, p + 7, '"', 15); 
          msg_text[strlen(msg_text) - 1] = 0;
        }       
       
printf("Msg_text:%s_END\n", msg_text);       
 
       in_message.size = 0;
       free(in_message.text);
 
       ///////////////////////////// my functions  ////////////////////////////////
       if(strstr(msg_text, "w") != NULL) 
        {
          sendMessage(chat_id); 
        }

       else if(strstr(msg_text, "/start") != NULL) 
        {
          printf("Кто-то нашёл бота.\n");
        }
         
       else printf("NO_DATA\n");
    }
   
   curl_global_cleanup();
   return 0;
}


// gcc -Wall -Wextra telegramgetup.c -o telegramgetup -lcurl

// ./telegramgetup

include $(TOPDIR)/rules.mk

PKG_NAME:=telegramgetup
PKG_VERSION:=1
PKG_RELEASE:=1

PKG_BUILD_DIR:= $(BUILD_DIR)/$(PKG_NAME)

include $(INCLUDE_DIR)/package.mk


define Package/telegramgetup
	SECTION:=utils
	CATEGORY:=Utilities
	TITLE:=telegramgetup - Telegramgetup utility
	DEPENDS:=+libcurl
endef

define Package/telegramgetup/description
    telegramgetup - Telegramgetup utility
endef

define Build/Prepare
	mkdir -p $(PKG_BUILD_DIR)
	$(CP) ./src/* $(PKG_BUILD_DIR)/
endef


define Build/Compile
	$(TARGET_CC) $(TARGET_CFLAGS) -c -o $(PKG_BUILD_DIR)/telegramgetup.o $(PKG_BUILD_DIR)/telegramgetup.c
	$(TARGET_CC) $(TARGET_LDFLAGS) -o $(PKG_BUILD_DIR)/telegramgetup $(PKG_BUILD_DIR)/telegramgetup.o -lcurl
endef

define Package/telegramgetup/install
	$(INSTALL_DIR) $(1)/usr/sbin
	$(INSTALL_BIN) $(PKG_BUILD_DIR)/telegramgetup $(1)/usr/sbin/
endef

$(eval $(call BuildPackage,telegramgetup))

// make package/telegramgetup/compile V=s

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