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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/07/06 07:31:38 by cacharle #+# #+# */
/* Updated: 2019/07/06 15:48:43 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
int pow10(int exponent)
{
int accumulator;
accumulator = 1;
while (exponent > 0)
{
accumulator *= 10;
exponent--;
}
return (accumulator);
}
int ft_atoi(char *str)
{
int is_negative;
int nb;
int i;
int j;
while (*str == ' ' || *str == '\t' || *str == '\n'
|| *str == '\v' || *str == '\f' || *str == '\r')
str++;
is_negative = 0;
while (*str == '-' || *str == '+')
{
if (*str == '-')
is_negative = !is_negative;
str++;
}
nb = 0;
i = 0;
while (str[i] >= '0' && str[i] <= '9')
i++;
j = 0;
while (str[j] >= '0' && str[j] <= '9')
nb += pow10(--i) * (str[j++] - '0');
if (is_negative)
nb = -nb;
return (nb);
}
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