get_next_line_utils.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        ::::::::            */
/*   get_next_line_utils.c                              :+:    :+:            */
/*                                                     +:+                    */
/*   By: dreijans <dreijans@student.codam.nl>         +#+                     */
/*                                                   +#+                      */
/*   Created: 2022/12/22 13:18:14 by dreijans      #+#    #+#                 */
/*   Updated: 2023/01/23 16:53:13 by dreijans      ########   odam.nl         */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"

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

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

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

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

char	*ft_substr(char const *s, unsigned int start, size_t len)
{
	char		*new_str;
	size_t		strlen;

	strlen = ft_strlen((char *)s);
	if (start >= strlen)
		len = 0;
	else if (len > strlen - start)
		len = strlen - start;
	if (len == 0)
		return (NULL);
	new_str = malloc(sizeof(char) * (len + 1));
	if (new_str == NULL)
		return (NULL);
	if (strlen == 0 || len == 0)
		new_str[0] = 0;
	else
		ft_strlcpy(new_str, &s[start], len + 1);
	return (new_str);
}

char	*ft_copy_join(char *s1, char *s2)
{
	char		*new_str;
	size_t		len;
	size_t		i;
	size_t		j;

	i = 0;
	j = 0;
	if (s1 == NULL && s2 == NULL)
		return (NULL);
	len = (ft_strlen(s1) + ft_strlen(s2)) + 1;
	new_str = (char *)malloc(sizeof (char) * len);
	if (new_str == NULL)
		return (NULL);
	if (s1 == NULL)
	{
		ft_strlcpy(new_str, s2, ft_strlen(s2) + 1);
		return (new_str);
	}
	while (s1 != NULL && s1[i] != '\0')
		new_str[j++] = s1[i++];
	i = 0;
	while (s2 != NULL && s2[i] != '\0')
		new_str[j++] = s2[i++];
	new_str[j] = '\0';
	return (new_str);
}