main.c

/*
** main.c for Projet-Bistro in /home/giallo_n/git/Projet-Bistro/res
** 
** Made by nathan giallombardo
** Login   <giallo_n@epitech.net>
** 
** Started on  Sat Nov  9 16:49:46 2013 nathan giallombardo
** Last update Sun Nov 10 19:42:58 2013 nathan giallombardo
*/

#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "bistromathique.h"
#include "my.h"

int my_atoi(char *);
static void check_base(char *base);
static void check_ops(char *ops);
static char *get_expr(unsigned size);

int main(int ac, char **av)
{
  char *expr;
  unsigned int size;
if (ac != 4)
  {
    my_putstr("Usage : ");
    my_putstr(av[0]);
    my_putstr(" base ops\"()+-*/%\" exp_len\n");
    exit(1);
}
 check_base(av[1]);
 check_ops(av[2]);
 size = my_atoi(av[3]);
 expr = get_expr(size);
 my_putstr(eval_expr(av[1], av[2], expr, size));
 return (0);
}

static void check_base(char *b)
{
  if (my_strlen(b) < 2)
    {
      my_putstr("Bad base\n");
      exit(1);
    }
}

static char *get_expr(unsigned int size)
{
  char *expr;

  if (size <= 0)
    {
      my_putstr("Bad expr len\n");
      exit(2);
    }
  expr = malloc(size+1);
  if (expr == 0)
    {
      my_putstr("could not alloc\n");
      exit(3);
    }
  if (read(0, expr, size) != size)
    {
      my_putstr("could not read\n");
      exit(4);
    }
  expr[size] = 0;
  return (expr);
}

static void check_ops(char *ops)
{
  if (my_strlen(ops) != 7)
    {
      my_putstr("Bad ops\n");
      exit(5);
    }
}

int	my_atoi(char *str)
{
  int	val;

  val = 0;
  while(*str)
    {
      if (*str <= '0' && *str >= '9')
	{
	  val = val * 10;
	  val = val + *str - '0';
	}
      else
	return (val);
      *str = *str + 1;
    }
  return (val);
}