get_next_line_utils.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line_utils.c                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: zerudo <zerudo@student.42.fr>              +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/02/09 09:55:49 by zerudo            #+#    #+#             */
/*   Updated: 2022/02/11 14:42:48 by trobert          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"

int	is_line(const char *s)
{
	int	i;

	i = 0;
	while (s[i])
	{
		if (s[i] == '\n')
			return (1);
		i++;
	}
	return (0);
}

int	ft_strlen(char *s)
{
	int	i;

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

char	*ft_substr(char *s, int start, int len)
{
	int		i;
	char	*str;
	int		s_len;

	i = 0;
	if (!s)
		return (NULL);
	s_len = ft_strlen(s);
	if (start > s_len)
		len = 0;
	else if (len > s_len - start)
		len = s_len - start;
	str = malloc(sizeof(char) * (len + 1));
	if (!str)
		return (NULL);
	while (i < len)
		str[i++] = s[start++];
	str[i] = '\0';
	return (str);
}

char	*ft_strjoin(char *s1, char *s2)
{
	int		s1_len;
	int		s2_len;
	int		i;
	int		j;
	char	*str;

	if (s1 == NULL || s2 == NULL)
		return (0);
	s1_len = ft_strlen(s1);
	s2_len = ft_strlen(s2);
	i = 0;
	j = 0;
	str = malloc(sizeof(char) * (s1_len + s2_len + 1));
	if (str == NULL)
		return (NULL);
	while (i < s1_len)
	{
		str[i] = s1[i];
		i++;
	}
	while (i < (s1_len + s2_len))
		str[i++] = s2[j++];
	str[s1_len + s2_len] = '\0';
	free(s1);
	return (str);
}

char	*ft_strdup(char *src)
{
	char	*copy;
	size_t	size;
	int		i;

	i = 0;
	size = ft_strlen(src);
	copy = malloc(sizeof(char) * (size + 1));
	if (copy == NULL)
		return (NULL);
	while (src[i])
	{
		copy[i] = src[i];
		i++;
	}
	copy[i] = '\0';
	return (copy);
}