42_get_next_line/get_next_line_utils.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line_utils.c                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/26 00:55:44 by cchauvet          #+#    #+#             */
/*   Updated: 2022/11/14 15:39:50 by cchauvet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"

void	*ft_calloc(size_t nmemb, size_t size)
{
	char	*tab;
	size_t	i;

	if (nmemb == 0 || size * nmemb / nmemb != size)
		return (NULL);
	tab = malloc(nmemb * size);
	if (tab == NULL)
		return (NULL);
	i = 0;
	while (i < size * nmemb)
	{
		tab[i] = 0;
		i++;
	}
	return ((void *) tab);
}

size_t	ft_strlen(char *str)
{
	size_t	i;

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

char	*ft_strfjoin(char *s1, char *s2)
{
	ssize_t	i;
	ssize_t	j;
	char	*out;

	out = ft_calloc((ft_strlen(s1) + ft_strlen(s2) + 1), sizeof(char));
	if (out == NULL)
		return (NULL);
	i = 0;
	if (s1 != NULL)
	{
		while (s1[i] != '\0')
		{
			out[i] = s1[i];
			i++;
		}
	}
	free(s1);
	j = -1;
	if (s2 != NULL)
	{
		while (s2[++j] != '\0')
			out[i + j] = s2[j];
	}
	free(s2);
	return (out);
}

char	*ft_strndup(char *src, size_t n)
{
	char	*out;
	size_t	i;

	if (src[0] == '\0')
		return (NULL);
	out = ft_calloc(n + 1, sizeof(char));
	if (out == NULL)
		return (NULL);
	i = 0;
	while (src[i] != '\0' && i < n)
	{
		out[i] = src[i];
		i++;
	}
	return (out);
}

ssize_t	ft_strchr(char *str, char c)
{
	size_t	i;

	if (str == NULL)
		return (-1);
	i = 0;
	while (str[i] != c && str[i] != '\0')
		i++;
	if (str[i] == '\0')
		return (-1);
	return (i);
}