beerbox/beerbox.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "beerbox.h"
#include <SPI.h>
#include <SD.h>

//Beware! Only valid inside the function it has been set in!
char tmp_filename[FILE_NAME_LEN + FILE_EXTENSION_LEN + 2];



Beerbox* read_beerbox(Beerbox *box){

  FILE *read = NULL;
  int num_read = 0;
  int index;

  char tmp[(DRINK_NAME_MAX_LENGTH + 1) * NUM_OF_DRINKS];

  int i = 0;


  read = SD.open("beerbox.config", FILE_READ);
  if(read == NULL){

    perror("error while reading!\n");
    printf("ABORT!\n\n");
    exit(-1);

  }

  for(i = 0 ; i < NUM_OF_DRINKS ; i++){

    read_line_from_file(read, tmp, sizeof(tmp));

    if(strlen(tmp)){
      sscanf(tmp, " drink number %d: %s",&index,box->drinks[i].name);

      read_line_from_file(read, tmp, sizeof(tmp));
      sscanf(tmp, " %*s %d ",&box->drinks[i].price);

      read_line_from_file(read, tmp, sizeof(tmp));
      sscanf(tmp, " %*s %d",&box->drinks[i].quantity);
    }else{
        strcpy(box->drinks[i].name, "slot empty");
        box->drinks[i].price = -1;
        box->drinks[i].quantity = -1;
    }

  }

  printf("%d drinks read!\n\n", i);

  for(i = 0; (i < NUM_OF_DRINKS)&&(box->drinks[i].price != -1); i++){

    printf("drink number %d: %s\nprice: %d\nquantity: %d\n\n",i+1,box->drinks[i].name,box->drinks[i].price,box->drinks[i].quantity);

  }

  if(i < NUM_OF_DRINKS)printf("Slots %d - %d are not in use!\n", i+1, NUM_OF_DRINKS);

  fclose(read);
  return box;

}

Person read_person(Beerbox *box, char *filename){

  Person aperson;

  FILE *read = NULL;

  int num_read = 0;
  int index;
  int tmp_int = 0;

  char tmp[(DRINK_NAME_MAX_LENGTH + 1) * NUM_OF_DRINKS];
  char tmp_drink_name[DRINK_NAME_MAX_LENGTH + 1];

  int i = 0;
  int j = 0;

  memset(tmp_filename, 0, sizeof(tmp_filename));

  strcat(tmp_filename, filename);
  strcat(tmp_filename, ".");
  strcat(tmp_filename, FILE_EXTENSION);

  read = fopen(tmp_filename, "r");
  if(read == NULL){

    perror("error while reading!\n");
    printf("ABORT!\n\n");
    exit(-1);

  }

  strcpy(aperson.file_name, filename);

  for(i = 0; i < NUM_OF_DRINKS; i++){
    aperson.drinks_taken[i] = -1;
  }


  read_line_from_file(read, tmp, sizeof(tmp));
  strcpy(aperson.name, tmp);

  read_line_from_file(read, tmp, sizeof(tmp));
  sscanf(tmp, " %*s %d", &aperson.rfid_uuid);

  read_line_from_file(read, tmp, sizeof(tmp));
  sscanf(tmp, " %*s %d", &aperson.finger_uuid);


  j = 0;
  while(read_line_from_file(read, tmp, sizeof(tmp)), strlen(tmp) > 0){

    i = 0;
    sscanf(tmp, " %*s %s", tmp_drink_name);

      for(i = 0;(i < NUM_OF_DRINKS)&&(strcmp(box->drinks[i].name, tmp_drink_name)); i++){
        //printf("It´s not drink No %d: %s\n", i+1, box->drinks[i].name );

      }

    if(i == NUM_OF_DRINKS){
      //Is it in?
      //printf("Drink \"%s\" does not exist in box!\n", tmp_drink_name);
    }else{

      read_line_from_file(read, tmp, sizeof(tmp));
      sscanf(tmp, " %*s %d", &aperson.drinks_taken[i]);
      //printf(">>Quantity: %d\n", aperson.drinks_taken[i].quantity);
      read_line_from_file(read, tmp, sizeof(tmp));
      //printf(">>Total: %d\n\n", aperson.drinks_taken[i].total);
    }

  }


  print_person(box, &aperson);

  update_pers_file(box, &aperson);

  fclose(read);

  return aperson;
}

void print_person(Beerbox *box, Person *aperson){

  int i = 0;

  memset(tmp_filename, 0, sizeof(tmp_filename));
  strcat(tmp_filename, aperson->file_name);
  strcat(tmp_filename, ".");
  strcat(tmp_filename, FILE_EXTENSION);

  printf("\nPerson is called \"%s\" and has the filename \"%s\".\n", aperson->name, tmp_filename);
  printf("rfid_uuid:   %d\n", aperson->rfid_uuid);
  printf("finger_uuid: %d\n", aperson->finger_uuid);

  for(i = 0; i < NUM_OF_DRINKS; i++){

    if(aperson->drinks_taken[i] != -1){

      printf("\nDrink: %s\n", box->drinks[i].name);
      printf("Consumed: %d\n", aperson->drinks_taken[i]);
      printf("Total: %d.%02d Euro\n", aperson->drinks_taken[i]*box->drinks[i].price/100, (aperson->drinks_taken[i]*box->drinks[i].price)%100);

    }

  }

}

int update_pers_file(Beerbox *box, Person *aperson){
  FILE *write = NULL;
  char *tmp = NULL;
  //write = fopen()
  int i = 0;

  memset(tmp_filename, 0, sizeof(tmp_filename));
  strcat(tmp_filename, aperson->file_name);
  strcat(tmp_filename, ".");
  strcat(tmp_filename, FILE_EXTENSION);

  write = fopen(tmp_filename, "w");
  if(write == NULL){
    perror("error while reading!\n");
    printf("ABORT!\n\n");
    exit(-1);

  }

  fprintf(write, "%s\n", aperson->name);
  fprintf(write, "rfid_uuid:   %d\n", aperson->rfid_uuid);
  fprintf(write, "finger_uuid: %d\n", aperson->finger_uuid);

  for(i = 0; i < NUM_OF_DRINKS; i++){

    if(aperson->drinks_taken[i] != -1){

      fprintf(write, "\nDrink: %s\n", box->drinks[i].name);
      fprintf(write, "Consumed: %d\n", aperson->drinks_taken[i]);
      fprintf(write, "Total: %d\n\n", aperson->drinks_taken[i]*box->drinks[i].price);

    }

  }


  fclose(write);

  return 0;

}

char* read_from_file_until(FILE *stream, char *str, int max_len, char until){

  int i = 0;
  int tmp_int = 0;

  memset(str, 0, max_len);

  for(i = 0; (tmp_int != until)&&(i < (max_len-1))&&(tmp_int != EOF); i++){
    tmp_int = fgetc(stream);
    //printf("%c", tmp_int);
    str[i] = tmp_int;
  }


  if(tmp_int == EOF){

    //May occur more often as the function tries to read a certain number of drinks.
    //printf("END OF FILE REACHED!\nABORT!!\n\n");

    str[0] = 0;
    return str;
  }

  if(str[0] != '\n')str[i-1] = 0;


  return str;
}

char *read_line_from_file(FILE *stream, char *str, int max_len){

  do{
    str = read_from_file_until(stream, str, max_len, '\n');
  }while((str[0] == '\n'));


  return str;
}