get_next_line_utils_bonus.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line_utils_bonus.c                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: lfilloux <lfilloux@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/11/12 13:08:09 by lfilloux          #+#    #+#             */
/*   Updated: 2021/11/13 13:43:15 by lfilloux         ###   ########lyon.fr   */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"

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

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

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

	if (!s)
		return (-1);
	i = 0;
	while (s[i])
	{
		if (s[i] == (unsigned char)c)
			return (i);
		i ++;
	}
	return (-1);
}

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

	i = 0;
	if (!s)
		return (NULL);
	if (start >= ft_strlen(s))
	{
		dest = (char *)malloc(sizeof(char) * (ft_strlen(s) + 1));
		if (!dest)
			return (NULL);
		while (s[i++])
			dest[i] = s[i];
		dest[i] = '\0';
		return (dest);
	}
	if (ft_strlen(&s[start]) <= len)
		len = ft_strlen(&s[start]);
	dest = (char *)malloc(sizeof(char) * (len + 1));
	if (!dest)
		return (NULL);
	ft_strlcpy(dest, &s[start], len + 1);
	return (dest);
}

size_t	ft_strlcpy(char	*dst, const char *src, size_t dstsize)
{
	size_t	i;

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

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

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