get_next_line_utils.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line_utils.c                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: dpaluszk <dpaluszk@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/04/07 12:51:17 by dpaluszk          #+#    #+#             */
/*   Updated: 2024/04/18 17:30:49 by dpaluszk         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"

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

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

char	*ft_strjoin(const char *s1, const char *s2)
{
	char	*new;
	size_t	i;
	size_t	j;

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

char	*ft_strchr(const char *s, int c)
{
	size_t	i;

	i = 0;
	while (s[i] != '\0')
	{
		if (s[i] == (char)c)
			return ((char *)&s[i]);
		i++;
	}
	if ((char)c == '\0')
		return ((char *)&s[i]);
	return (NULL);
}

char	*ft_strdup(const char *s1)
{
	char	*str;
	size_t	i;

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

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

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