get_next_line_utils_bonus.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line_utils_bonus.c                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jwon <marvin@42.fr>                        +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/04/09 16:34:18 by jwon              #+#    #+#             */
/*   Updated: 2020/04/17 16:10:07 by jwon             ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line_bonus.h"

size_t	ft_strlen(const char *str)
{
	int		idx;

	idx = 0;
	while (str[idx])
		idx++;
	return (idx);
}

char	*ft_strdup(const char *str)
{
	int		idx;
	char	*dest;

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

char	*ft_strchr(const char *str, int c)
{
	while (*str)
	{
		if (*str == c)
			return ((char *)str);
		str++;
	}
	if (c == '\0')
		return ((char *)str);
	return (0);
}

char	*ft_substr(char const *s, unsigned int start, size_t len)
{
	unsigned int	idx;
	size_t			s_len;
	char			*modified_s;

	if (!s || !(modified_s = malloc(sizeof(char) * (len + 1))))
		return (NULL);
	s_len = ft_strlen((char *)s);
	idx = 0;
	while (start < s_len && s[start + idx] && idx < len)
	{
		modified_s[idx] = s[start + idx];
		idx++;
	}
	modified_s[idx] = '\0';
	return (modified_s);
}

char	*ft_strjoin(char *s1, char *s2)
{
	int			idx;
	int			idx_join;
	char		*join;

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