ft_strrchr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        ::::::::            */
/*   ft_strrchr.c                                       :+:    :+:            */
/*                                                     +:+                    */
/*   By: cwesseli <cwesseli@student.codam.nl>         +#+                     */
/*                                                   +#+                      */
/*   Created: 2022/10/10 09:28:03 by cwesseli      #+#    #+#                 */
/*   Updated: 2022/10/17 14:37:38 by cwesseli      ########   odam.nl         */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strrchr(const char *s, int c)
{
	int		l;
	char	*checker;
	char	to_check;

	to_check = (char)c;
	l = ft_strlen(s);
	checker = (char *)s + l;
	while (*checker != to_check)
	{
		if (l-- == '\0')
			return (0);
		checker--;
	}
	return (checker);
}

// DESCRIPTION         top
//        The strchr() function returns a pointer to the first occurrence
//        of the character c in the string s.

//        The strrchr() function returns a pointer to the last occurrence
//        of the character c in the string s.

//        The strchrnul() function is like strchr() except that if c is not
//        found in s, then it returns a pointer to the null byte at the end
//        of s, rather than NULL.

//        Here "character" means "byte"; these functions do not work with
//        wide or multibyte characters.
// RETURN VALUE         top
//        The strchr() and strrchr() functions return a pointer to the
//        matched character or NULL if the character is not found.  The
//        terminating null byte is considered part of the string, so that
//        if c is specified as '\0', these functions return a pointer to
//        the terminator.

//        The strchrnul() function returns a pointer to the matched
//        character, or a pointer to the null byte at the end of s (i.e.,
//        s+strlen(s)) if the character is not found.