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char ctoi(char c)
{
return (c - '0');
}
int ft_strlen(const char *str)
{
int counter;
counter = 0;
while (*str >= '0' && *str <= '9')
{
counter++;
str++;
}
return (counter);
}
int pow10(int exponent)
{
int accumulator;
accumulator = 1;
while (exponent > 0)
{
accumulator *= 10;
exponent--;
}
return (accumulator);
}
int ft_atoi(const char *str)
{
int nb;
int i;
int is_negative;
while (*str == ' ' || *str == '\t'|| *str == '\n'
|| *str == '\v'|| *str == '\f'|| *str == '\r')
str++;
if (*str == '-')
is_negative = 1;
else
is_negative = 0;
if (*str == '-' || *str == '+')
{
str++;
}
nb = 0;
i = ft_strlen(str) - 1;
while (*str >= '0' && *str <= '9')
{
nb += pow10(i) * ctoi(*str);
i--;
str++;
}
if (is_negative)
nb = -nb;
return (nb);
}
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