libft_string.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   libft_string.c                                     :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jkong <jkong@student.42seoul.kr>           +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/05/21 15:31:13 by jkong             #+#    #+#             */
/*   Updated: 2022/06/22 19:07:48 by jkong            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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

int	ft_strcmp(const char *s1, const char *s2)
{
	while (*s1 && *s2 && *s1 == *s2)
	{
		s1++;
		s2++;
	}
	return ((unsigned char)*s1 - (unsigned char)*s2);
}

char	*ft_strchr(const char *s, int c)
{
	while (*s)
	{
		if (*s == (char)c)
			return ((char *)s);
		s++;
	}
	if (c == '\0')
		return ((char *)s);
	return (NULL);
}