Add files, first commit

1 files changed, 86 insertions, 0 deletions

diff --git a/ft_strrchr.c b/ft_strrchr.c
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--- /dev/null
+++ b/ft_strrchr.c
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+/*
+Libft Copyright (C) 2026 yctct
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include "libft.h"
+
+char	*ft_strrchr(const char *s, int c)
+{
+	int	slen;
+
+	slen = ft_strlen(s);
+	while (slen >= 0)
+	{
+		if (s[slen] == (char)c)
+			return ((char *)&s[slen]);
+		slen--;
+	}
+	return (0);
+}
+
+/*
+char	*ft_strrchr(const char *p, int ch)
+{
+	int	i;
+
+	i = 0;
+	while (s[i])
+		i++;
+	while (s[i] != (char)c)
+		if (i-- == 0)
+			return (NULL);
+	return ((char *)&s[i]);
+}
+
+char	*ft_strrchr(const char *p, int ch)
+{
+	char	*save;
+
+	save = NULL;
+	while (1)
+	{
+		if (*p == (char)ch)
+			save = (char *)p;
+		if (!*p++)
+			return (save);
+	}
+}
+
+#include <string.h>
+
+int	main(void)
+{
+	const char	s[] = "Helleo";
+	int			i;
+	int			j;
+	int			k;
+
+	i = (int) 'i';
+	j = (int) 'e';
+	k = '\0';
+	printf("Expected return: NULL\n");
+	printf("ft_strrchr: %s\n", ft_strrchr(s, i));
+	printf("   strrchr: %s\n", strrchr(s, i));
+	printf("------------------------\n");
+	printf("Expected return: 'eo'\n");
+	printf("ft_strrchr: %s\n", ft_strrchr(s, j));
+	printf("   strrchr: %s\n", strrchr(s, j));
+	printf("------------------------\n");
+	printf("Expected return: 'null byte'\n");
+	printf("ft_strrchr: %s\n", ft_strrchr(s, k));
+	printf("   strrchr: %s\n", strrchr(s, k));
+}
+*/