get_next_line_utils.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line_utils.c                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: hfeufeu <marvin@42.fr>                     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/17 15:41:57 by hfeufeu           #+#    #+#             */
/*   Updated: 2024/10/17 15:41:59 by hfeufeu          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
#include "get_next_line.h"

size_t	ft_strlen(char *s)
{
	unsigned int	i;

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

char	*ft_strdup(char *s)
{
	char	*s1;
	int		i;

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

char	*ft_strjoin(char *s1, char *s2)
{
	int		i;
	int		j;
	char	*tmp;
	char	*prod;

	i = 0;
	j = 0;
	if (!s1 || !s2)
		return (NULL);
	tmp = ft_strdup(s1);
	free(s1);
	if (!tmp)
		return (NULL);
	prod = ft_calloc(1, ((ft_strlen(tmp) + ft_strlen(s2)) + 1));
	if (!prod)
		return (NULL);
	while (tmp[i] != '\0')
		prod[j++] = tmp[i++];
	i = 0;
	while (s2[i] != '\0')
		prod[j++] = s2[i++];
	prod[j] = '\0';
	free(tmp);
	return (prod);
}

char	*ft_substr(char *s, unsigned int start, size_t len)
{
	unsigned int	j;
	char			*des;

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

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

	i = 0;
	if (!s)
		return (NULL);
	if ((unsigned char)c > 127)
		return ((char *)&s[i]);
	while (s[i] != '\0')
	{
		if (s[i] == (unsigned char)c)
			return ((char *)&s[i]);
		i++;
	}
	if ((unsigned char)c == '\0')
		return ((char *)&s[i]);
	return (NULL);
}