get_next_line_utils_bonus.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line_utils_bonus.c                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ablabib <marvin@42.fr>                     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/12/09 20:34:49 by ablabib           #+#    #+#             */
/*   Updated: 2024/12/09 20:34:50 by ablabib          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line_bonus.h"

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

	len = 0;
	while (s[len])
		len++;
	return (len);
}

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

	ch = (char)c;
	while (*s)
	{
		if (*s == ch)
			return ((char *)s);
		s++;
	}
	if (ch == '\0')
		return ((char *)s);
	return (NULL);
}

char	*ft_strjoin(char const *s1, char const *s2)
{
	char	*str;
	size_t	len1;
	size_t	len2;
	size_t	i;
	size_t	j;

	if (!s1 || !s2)
		return (NULL);
	len1 = ft_strlen(s1);
	len2 = ft_strlen(s2);
	str = (char *)malloc((len1 + len2 + 1) * sizeof(char));
	if (!str)
		return (NULL);
	i = 0;
	j = 0;
	while (i < len1)
		str[j++] = s1[i++];
	i = 0;
	while (i < len2)
		str[j++] = s2[i++];
	str[j] = '\0';
	return (str);
}

char	*ft_strdup(const char *s)
{
	char	*str;
	size_t	len;
	size_t	i;

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

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

	i = -1;
	j = 0;
	if (!s)
		return (NULL);
	if (start >= ft_strlen(s))
		return (ft_strdup(""));
	if (len >= ft_strlen(s))
		substr = (char *)malloc(sizeof(char) * (ft_strlen(s) + 1));
	else
		substr = (char *)malloc(sizeof(char) * (len + 1));
	if (!substr)
		return (NULL);
	while (s[++i])
	{
		if (i >= start && j < len)
			substr[j++] = s[i];
	}
	substr[j] = '\0';
	return (substr);
}