libft/ft_strchr.c at master · FindingMiGo/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strchr.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: user <user@student.42tokyo.jp>             +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/04/29 15:30:00 by user              #+#    #+#             */
/*   Updated: 2023/04/29 15:30:00 by user             ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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

int	ft_strchr_n(char *s, char c)
{
	char	*p;

	if (!s)
		return (-1);
	p = ft_strchr(s, c);
	if (!p)
		return (-1);
	return (p - s);
}