what should i use instead of sprintf

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i have the following statement:-

printf("%-9s %5s %10s %4s %9s %18s %9s %10s %s\n",
            "COMMAND",
            "PID",
            "USER",
            "FD",
            "TYPE",
            "DEVICE",
            "SIZE/OFF",
            "NODE",
            "NAME");

i have the following declaration global:-

#define buffer_ls 2500
 char file11[200]="/sdcard/NewLs.txt";
int WriteToLog(char* str)
   {
	   __android_log_print(ANDROID_LOG_INFO,"Tarun1","IN::WriteToLog");
      FILE* log;
      log = fopen(file11, "a+");
      if (log == NULL)
    	  __android_log_print(ANDROID_LOG_INFO,"Tarun1","cannot open file error %s", strerror(errno));
         return -1;
      fprintf(log, "%s\n", str);
      fclose(log);
      __android_log_print(ANDROID_LOG_INFO,"Tarun1","OUT::WriteToLog");
      return 0;
   }

i want rather than printing in file i would like to print it in txt file so i did like this:-

sprintf(buffer_ls,"%-9s %5s %10s %4s %9s %18s %9s %10s %s\n",
            "COMMAND",
            "PID",
            "USER",
            "FD",
            "TYPE",
            "DEVICE",
            "SIZE/OFF",
            "NODE",
            "NAME");
WriteToLog(buffer_ls);

My code fails at sprinf what should i use instead of sprintf?