get_next_line/get_next_line_utils.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line_utils.c                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/11/01 12:31:58 by kcolin            #+#    #+#             */
/*   Updated: 2024/11/06 17:37:39 by kcolin           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"
#include <stdlib.h>

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

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

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

	if (s1 == NULL)
	{
		s1 = malloc(1);
		s1[0] = '\0';
	}
	out = malloc(ft_strlen(s1) + ft_strlen(s2) + 1);
	if (out == NULL)
		return (NULL);
	i = 0;
	j = 0;
	while (s1[i] != '\0')
	{
		out[i] = s1[i];
		i++;
	}
	while (s2[j] != '\0')
	{
		out[i] = s2[j];
		i++;
		j++;
	}
	return (out);
}

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

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

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

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