get_next_line_utils.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line_utils.c                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: lucavall <lucavall@student.42firenze.it    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/12/19 14:10:37 by lucavall          #+#    #+#             */
/*   Updated: 2024/01/08 12:20:35 by lucavall         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"

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

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

char	*ft_strdup(const char *s)
{
	char	*dest;
	int		i;

	dest = malloc(sizeof(char) * ft_strlen(s) + 1);
	if (!dest)
		return (NULL);
	i = 0;
	while (s[i] != '\0')
	{
		dest[i] = s[i];
		i++;
	}
	dest[i] = '\0';
	return (dest);
}

char	*ft_substr(char const *s, unsigned int start, size_t len)
{
	char	*str;
	size_t	i;
	size_t	str_len;

	if (!s)
		return (NULL);
	str_len = ft_strlen(s);
	if (start >= str_len)
		return (ft_strdup(""));
	if (len > str_len - start)
		len = str_len - start;
	str = malloc(sizeof(*s) * (len + 1));
	if (!str)
		return (NULL);
	i = 0;
	while (i < len && s[start + i])
	{
		str[i] = s[start + i];
		i++;
	}
	str[i] = '\0';
	return (str);
}

char	*ft_strjoin(char const *s1, char const *s2)
{
	char	*new_str;
	int		i;
	int		j;

	new_str = malloc(sizeof(char) * (ft_strlen(s1) + ft_strlen(s2) + 1));
	if (!new_str)
		return (NULL);
	i = 0;
	while (s1[i] != '\0')
	{
		new_str[i] = s1[i];
		i++;
	}
	j = 0;
	while (s2[j] != '\0')
	{
		new_str[i] = s2[j];
		i++;
		j++;
	}
	new_str[i] = '\0';
	return (new_str);
}