c++ - Socket Packet Post Data Truncated -

i working c++ socket programming, posting long string webpage processed. program runs ok, however, data sending truncated. webpage not process data successfully.

#maxline[4096]  ssize_t myclass::send_data(const char *host,const char *page,const char *poststr) {    char sendline[maxline+1], recvlin[maxline+1];    size_t n;    int c_length = strlen(poststr);    snprintf(sendline,maxsub ,            "post %s http/1.0\r\n"            "host: %s\r\n"            "content-type: application/x-www-form-urlencoded\r\n"            "content-length: %d\r\n\r\n"            "%s", page, host, c_length, poststr);    int line_length = sizeof(sendline);     int sig_status = send(sock, sendline, line_length,0);      if (sig_status < 0){      signal(sigpipe,sig_ign);    }   return n; } 

how can not truncated data sending?