utils.c

#include "push_swap.h"

int	ft_strncmp(const char *s1, const char *s2, size_t n)
{
	size_t	i;

	if (n == 0)
		return (0);
	i = 0;
	while (s1[i] == s2[i] && s1[i] != '\0')
	{
		if (i < (n - 1))
			i++;
		else
			return (0);
	}
	return ((unsigned char)(s1[i]) - (unsigned char)(s2[i]));
}

int	ft_atoi(const char *str)
{
	int			sign;
	long long	num;

	sign = 1;
	num = 0;
	while ((*str == 32) || (*str >= 9 && *str <= 13))
		str++;
	if (*str == 45)
	{
		sign *= -1;
		str++;
	}
	else if (*str == 43)
		str++;
	while (*str >= 48 && *str <= 57)
	{
		num = num * 10;
		num += (sign * (*(str++) - '0'));
		if (num > 2147483647)
			return (-1);
		if (num < -2147483648)
			return (0);
	}
	return (num);
}

size_t	ft_strlen(const char *str)
{
	size_t	i;

	i = 0;
	while (str[i] != '\0')
		i++;
	return (i);
}

int	ft_isdigit(int c)
{
	if (c >= 48 && c <= 57)
		return (1);
	else
		return (0);
}

void	ft_bzero(void *str, size_t n)
{
	size_t	i;

	i = 0;
	while (i < n)
	{
		((unsigned char *)str)[i] = '\0';
		i++;
	}
}