get_next_line_utils.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line_utils.c                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: imontero <imontero@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/05/17 12:22:32 by imontero          #+#    #+#             */
/*   Updated: 2023/05/24 17:01:49 by imontero         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"

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

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

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

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

char	*ft_strjoin(char const *s1, char const *s2)
{
	char			*new;
	unsigned int	i;
	unsigned int	j;

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

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

	if (!s)
		return (NULL);
	if (start > ft_strlen(s))
	{
		sub = malloc(1);
		if (!sub)
			return (NULL);
		sub[0] = '\0';
		return (sub);
	}
	if (len > ft_strlen(s) - start)
		len = ft_strlen(s) - start;
	sub = (char *)malloc(1 + len * sizeof(char));
	if (!sub)
		return (NULL);
	sub[len] = '\0';
	while (s[start] && len > 0)
	{
		len--;
		sub[len] = s[start + len];
	}
	return (sub);
}