get_next_line_utils_bonus.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line_utils_bonus.c                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: pablomar <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/12/02 14:10:11 by pablomar          #+#    #+#             */
/*   Updated: 2019/12/05 19:38:35 by pablomar         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line_bonus.h"

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

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

char				*ft_strdup(const char *s)
{
	int		i;
	int		size;
	char	*str;

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

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

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

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

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

void				ft_bzero(void *s, size_t n)
{
	unsigned char *ptr;

	ptr = (unsigned char*)s;
	while (n-- > 0)
		*(ptr++) = 0;
}