pcompte-1

// Suivi de compte bancaire
// Geecko, 2011

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

typedef struct
{
  char name[16];
  int (*f)();
} Command;

typedef struct
{
  int c, i;
  char** v;
} Argument;

typedef struct
{
  short day, month;
  int year;
  char desc[32];
  float balance;
} Operation;

char file_path[128];
Argument arg;
Operation *op = NULL;
int op_size = 0;

// Common

int checkCommand(Command cmd[], int size, char name[])
{
  int i;
  for (i=0; i<size; i++)
  {
    if (!strcmp(cmd[i].name,name)) return i;
  }
  return -1;
}


int remainingArg()
{
  return arg.c - arg.i;
}


void exec(Command cmd[], int size)
{
  int err;

  if (arg.i >= arg.c) return;

  err = checkCommand(cmd,size,arg.v[arg.i]);
  if (err < 0) printf("Invalid command (%s)\n",arg.v[arg.i]);
  arg.i++;

  err = cmd[err].f();
  if (err > 0) printf("Error arg #%d\n",arg.i+err-1);
  arg.i--;
}

void push(Operation t)
{
  op = realloc(op,(++op_size) * sizeof(Operation));
  op[op_size-1] = t;
}

void pop()
{
  op = realloc(op,(--op_size) * sizeof(Operation));
}

// File management

void load()
{
  op = NULL;
  op_size = 0;

  FILE* file = fopen(file_path,"r");
  if (file == NULL)
  {
    printf("Error opening file for reading\n");
    return;
  }

  Operation t;
  for (;;)
  {
    if (fscanf(file,"%*d %2hd%2hd%4d \"%[^\"]\" %f\n",
               &t.day,&t.month,&t.year,t.desc,&t.balance) <= 0) break;

    op = realloc(op,(++op_size) * sizeof(Operation));
    op[op_size-1] = t;
  }

  fclose(file);
}


void write()
{
  int i;

  FILE* file = fopen(file_path,"w");
  if (file == NULL)
  {
    printf("Error opening file for writing\n");
    return;
  }

  Operation t;
  for (i=0; i<op_size; i++)
  {
    t = op[i];
    if (fprintf(file,"%d %02hd%02hd%4d \"%s\" %.2f\n",
                i+1,t.day,t.month,t.year,t.desc,t.balance) <= 0) break;
  }

  fclose(file);
}

// "new"

int new()
{
  int amount;
  char desc[32];

  if (remainingArg() < 2) return arg.c - arg.i + 1;
  if (sscanf(arg.v[arg.i+0],"%s",desc) <= 0) return 1;
  if (sscanf(arg.v[arg.i+1],"%d",&amount) <= 0) return 2;

  time_t rawTime;
  struct tm* timeInfo;
  time(&rawTime);
  timeInfo = localtime(&rawTime);

  Operation t;
  t.day = timeInfo->tm_mday;
  t.month = timeInfo->tm_mon + 1;
  t.year = timeInfo->tm_year + 1900;
  t.balance = amount + (op_size>0 ? op[op_size-1].balance : 0);
  strncpy(t.desc,desc,32);
  push(t);

  write();
  printf("New operation (%02d/%02d/%4d) :\n",t.day,t.month,t.year);
  printf(" - ID is #%d\n",op_size);
  printf(" - Current balance is %.2f euro(s)\n",op[op_size-1].balance);

  return 0;
}

// "delete"

int delete()
{
  if (remainingArg() != 0) return 1;
  if (op_size <= 0)
  {
    printf("Nothing to delete\n");
    return 0;
  }

  printf("Deleting the last operation (%02d/%02d/%4d) :\n",
         op[op_size-1].day,op[op_size-1].month,op[op_size-1].year);
  printf(" - ID is back to #%d\n",op_size);
  printf(" - Current balance is back to %.2f euro(s)\n",op[op_size-2].balance);

  pop();
  write();

  return 0;
}

// Main

Command cmd_main[2] = {{"new",new},{"delete",delete}};

int main(int argc, char **argv)
{
  arg.c = argc;
  arg.v = argv;
  arg.i = 1;

  strcpy(file_path,argv[0]);
  strcpy(strrchr(file_path,'/')+1,"cmpt");

  load();
  exec(cmd_main,2);

  return 0;
}