Add files, first commit

1 files changed, 59 insertions, 0 deletions

diff --git a/ft_substr.c b/ft_substr.c
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--- /dev/null
+++ b/ft_substr.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_substr(char const *s, unsigned int start, size_t len)
+{
+	char	*ptr;
+	size_t	s_len;
+	size_t	ptr_len;
+
+	if (!s)
+		return (NULL);
+	s_len = ft_strlen(s);
+	if (s_len <= start)
+		return (ft_strdup(""));
+	else if (s_len > start + len)
+		ptr_len = len;
+	else
+		ptr_len = s_len - start;
+	ptr = malloc(ptr_len + 1);
+	ft_strlcpy(ptr, &s[start], ptr_len + 1);
+	return (ptr);
+}
+
+/*
+#include <stdio.h>
+
+int	main(void)
+{
+	char	s[] = "lorem ipsum dolor sit amet";
+	char	*ptr;
+
+	ptr = ft_substr(s, 6, 6);
+	printf("%s\n", ptr);
+	free(ptr);
+	printf("%s\n", ft_substr("", 0, 1));
+	printf("%s\n", ft_substr(s, 15, 1));
+	printf("%s\n", ft_substr(s, 0, 10));
+	printf("%s\n", ft_substr(s, 7, 10));
+	printf("%s\n", ft_substr(s, 7, 0));
+	printf("%s\n", ft_substr(s, 0, 0));
+	printf("%s\n", ft_substr(s, 400, 20));
+}
+*/