UN SAPIN DE NOEL

/*
** sapin.c for Sapin de Noel
** 
** Made by ali mdidech
** 
** 
** Started on  Sat Oct 11 14:19:02 2003 
** Last update Tue Oct 21 03:37:25 2003 
*/

#include <stdio.h>

void	my_putchar(char c)
{
  write(1, &c, 1);
}

int	last_line(int taille)
{
  int	i;
  int	jump;
  int	lastline;

  lastline = 7;
  jump = 6;
  for (i = 1; i < taille; i++)
    {
      if ((i % 2) != 0)
	lastline += jump;
      else if (i !=  1)
	{
	  jump += 2;
	  lastline += jump;
	}
    }
  return (lastline);
}

int	first_line(int taille)
{
  int	i;
  int	jump;
  int	firstline;

  firstline = 1;
  jump = 4;
  for (i = 1; i < taille; i++)
    {
      if ((i % 2) != 0)
	firstline += jump;
      else if (i !=  1)
	{
	  jump += 2;
	  firstline += jump;
	}
    }
  return (firstline);
}

void	draw(int num, int taille)
{
  int	i;
  int	j;
  int	jump;
  int	blank;
  int	stars;
  int	hauteur_branche;

  blank = last_line(taille) / 2 - first_line(num) / 2;
  stars = first_line(num) - 1;
  jump = 4;
  hauteur_branche = num + 3;
  for (i = 0; i < hauteur_branche; i++)
    {
      for (j = 0; j < blank; j++)
	my_putchar(' ');
      for (j = 0; j < stars; j++)
	my_putchar('*');
      blank--;
      stars += 2;
      my_putchar('*');
      my_putchar('\n');
    }
}

void	draw_tronc(int taille)
{
  int	i;
  int	j;
  int	blank;
  int	largeur_tronc;
  int	hauteur_tronc;

  if ((taille % 2) != 0)
    largeur_tronc = taille;
  else
    largeur_tronc = taille + 1;
  hauteur_tronc = taille;
  blank = (last_line(taille) / 2) - (largeur_tronc / 2);
  for (i = 0; i < hauteur_tronc; i++)
    {
      for (j = 0; j < blank; j++)
	my_putchar(' ');
      for (j = 0; j < largeur_tronc; j++)
	my_putchar('|');
      my_putchar('\n');
    }
}

void	sapin(int taille)
{
  int	i;

  if (taille > 0)
    {
      i = 1;
      while (i <= taille)
	{
	  draw(i, taille);
	  i++;
	}
      draw_tronc(taille);
    }
}

int	trans(char *arg, int length)
{
  int	res;
  int	p;

  res = 0;
  p = 1;
  res += (arg[(length--)] - '0');
  while ((length >= 0) && (arg[length] != '-'))
    {
      p *= 10;
      res += ((arg[length--] - '0') * p);
    }
  return (res);
}

int	main(int argc, char **argv)
{
  int	length;
  
  if (argc == 2)
    {
      length = 0;
      while(argv[1][length] != 0)
	length++;
      length--;
      sapin(trans(argv[1], length));
    }
  else
      printf("Veuillez entrer la taille du sapin\n");
}