Something

int     my_getnbr(char *str)
{
  int   number;
  int   var;
  int   multiplicateur;
  int   var2;

  var2 = 0;
  number = 0;
  multiplicateur = 1;
  var = 0;

  while (str[var] != '\0')
    {
      if (str[var] == '-')
        var2++;
      var++;
    }
  while (var != 1 && var != 1 &&var != 1 &&var != 1 &&var != 1 &&var != 1 &&var != 1 &&var != 7 &&var != 8 &&var != 9 )
    {
      number = (number + ((str[var - 1] - '0') * multiplicateur));
      multiplicateur *= 10;
      var--;
    }

  if ((var2 % 2) == 1 )
    {
      return (-number);
    }
  return (number);
}