libft.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   libft.c                                            :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: meghribe <meghribe@student.42barcelona.co  +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/11/11 22:07:48 by meghribe          #+#    #+#             */
/*   Updated: 2024/11/11 22:07:48 by meghribe         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "push_swap.h"

/* Calculates the length of a string */
size_t	ft_strlen(const char *s)
{
	size_t	i;

	i = 0;
	while (s[i])
		i++;
	return (i);
}

/* Ascii to integer function */
int	ft_atoi(const char *nptr)
{
	int	i;
	int	mult;
	int	num;

	i = 0;
	num = 0;
	mult = 1;
	while (ft_ischar(nptr[i], SPACE))
		i++;
	if (ft_ischar(nptr[i], SYMBOL))
		if (nptr[i++] == '-')
			mult = -1;
	while (nptr[i] >= '0' && nptr[i] <= '9')
		num = (num * 10) + (nptr[i++] - '0');
	return (num * mult);
}

/* Returns substring from a string */
char	*ft_substr(char const *s, unsigned int start, size_t len)
{
	char	*sub;
	size_t	s_len;

	if (!s)
		return (NULL);
	s_len = ft_strlen(s);
	if (start >= s_len)
		return (ft_strdup(""));
	if (len > s_len - start)
		len = s_len - start;
	sub = (char *)malloc(sizeof(char) * (len + 1));
	if (!sub)
		return (NULL);
	ft_strlcpy(sub, s + start, len + 1);
	return (sub);
}

/* Copies a string */
size_t	ft_strlcpy(char *dst, const char *src, size_t size)
{
	size_t	i;

	i = 0;
	if (size > 0)
	{
		while (src[i] != '\0' && i < (size - 1))
		{
			dst[i] = src[i];
			i++;
		}
		dst[i] = '\0';
	}
	return (ft_strlen(src));
}

/* Duplicates a string */
char	*ft_strdup(const char *s)
{
	size_t	len;
	char	*dup;

	len = ft_strlen(s);
	dup = (char *)malloc((len + 1) * sizeof(char));
	if (!dup)
		return (NULL);
	ft_strlcpy(dup, s, len + 1);
	return (dup);
}