From: Dominik Kaiser <dkaiser@1-C-13.42heilbronn.de>
Date: Wed, 6 Mar 2024 20:02:09 +0000 (+0100)
Subject: Setup and current progress
X-Git-Url: https://git.dkaiser.de/?a=commitdiff_plain;h=f861789c3e5e004395c1b7214757d5a83625d845;p=42%2Flibft.git

Setup and current progress

Forgot to commit earlier...
---

f861789c3e5e004395c1b7214757d5a83625d845
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..e69de29
diff --git a/ft_atoi.c b/ft_atoi.c
new file mode 100644
index 0000000..6f7bd55
--- /dev/null
+++ b/ft_atoi.c
@@ -0,0 +1,45 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_atoi.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 16:25:27 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 19:41:51 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_atoi(const char *str)
+{
+	int	result;
+	int	i;
+	int	posneg;
+
+	posneg = 1;
+	result = 0;
+	i = 0;
+	while (str[i] >= '\t' && str[i] <= '\r' || str[i] == ' ')
+	{
+		i++;
+	}
+	if (str[i] == '-')
+	{
+		posneg = -1;
+		i++;
+	}
+	while (str[i] >= '0' && str[i] <= '9')
+	{
+		result = 10 * result + str[i] - '0';
+		i++;
+	}
+	return (result * posneg);
+}
+
+/* #include <stdio.h> */
+/* #include <stdlib.h> */
+/* int main() { */
+/*     char str[] = "         -42eaeouai"; */
+/*     printf("atoi: %d\n", atoi(str)); */
+/*     printf("ft_atoi: %d\n", ft_atoi(str)); */
+/* } */
diff --git a/ft_bzero.c b/ft_bzero.c
new file mode 100644
index 0000000..d84d507
--- /dev/null
+++ b/ft_bzero.c
@@ -0,0 +1,27 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_bzero.c                                         :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/05 10:57:36 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 11:49:38 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <string.h>
+
+void	ft_bzero(void *s, size_t n)
+{
+	char	*ptr;
+	size_t	i;
+
+	ptr = (char *)b;
+	i = 0;
+	while (i < n)
+	{
+		ptr[i] = 0;
+		i++;
+	}
+}
diff --git a/ft_calloc.c b/ft_calloc.c
new file mode 100644
index 0000000..117892d
--- /dev/null
+++ b/ft_calloc.c
@@ -0,0 +1,28 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_calloc.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 19:45:56 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 19:52:19 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stdlib.h>
+
+void	*calloc(size_t count, size_t size)
+{
+	void	*result;
+	size_t	i;
+
+	result = malloc(count * size);
+	i = 0;
+	while (i < count * size)
+	{
+		*((char *)result + i) = 0;
+		i++;
+	}
+	return (result);
+}
diff --git a/ft_isalnum.c b/ft_isalnum.c
new file mode 100644
index 0000000..4de4a63
--- /dev/null
+++ b/ft_isalnum.c
@@ -0,0 +1,19 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_isalnum.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/04 21:14:49 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/04 21:17:16 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_isalnum(int c)
+{
+	if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0'
+			&& c <= '9'))
+		return (1);
+	return (0);
+}
diff --git a/ft_isalpha.c b/ft_isalpha.c
new file mode 100644
index 0000000..667bb5f
--- /dev/null
+++ b/ft_isalpha.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_isalpha.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/04 19:59:23 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/04 21:06:31 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	isalpha(int c)
+{
+	if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
+		return (1);
+	return (0);
+}
diff --git a/ft_isascii.c b/ft_isascii.c
new file mode 100644
index 0000000..6570d44
--- /dev/null
+++ b/ft_isascii.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_isascii.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/04 21:23:25 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/04 21:24:46 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_isascii(int c)
+{
+	if (c >= 0 && c < 128)
+		return (1);
+	return (0);
+}
diff --git a/ft_isdigit.c b/ft_isdigit.c
new file mode 100644
index 0000000..273bfa3
--- /dev/null
+++ b/ft_isdigit.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_isdigit.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/04 21:07:03 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/04 21:18:00 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_isdigit(int c)
+{
+	if (c >= '0' && c <= '9')
+		return (1);
+	return (0);
+}
diff --git a/ft_isprint.c b/ft_isprint.c
new file mode 100644
index 0000000..6c9faed
--- /dev/null
+++ b/ft_isprint.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_isprint.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/04 21:25:31 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/04 21:27:57 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_isprint(int c)
+{
+	if (c >= ' ' && c <= '~')
+		return (1);
+	return (0);
+}
diff --git a/ft_memchr.c b/ft_memchr.c
new file mode 100644
index 0000000..da3b0a6
--- /dev/null
+++ b/ft_memchr.c
@@ -0,0 +1,34 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memchr.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 15:23:01 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 15:50:06 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <string.h>
+
+void	*ft_memchr(const void *s, int c, size_t n)
+{
+	size_t	i;
+
+	i = 0;
+	while (i < n)
+	{
+		if (*((unsigned char *)s + i) == (unsigned char)c)
+			return ((void *)s + i);
+		i++;
+	}
+	return (0);
+}
+
+/* #include <stdio.h> */
+/* int main () { */
+/*     char str[] = "Hello world"; */
+/*     printf("memchr: %s\n", (char *) memchr(str, 'o', 11)); */
+/*     printf("ft_memchr: %s\n", (char *) ft_memchr(str, 'o', 11)); */
+/* } */
diff --git a/ft_memcmp.c b/ft_memcmp.c
new file mode 100644
index 0000000..a1e18da
--- /dev/null
+++ b/ft_memcmp.c
@@ -0,0 +1,39 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memcmp.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 15:54:13 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 19:45:09 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <string.h>
+
+int	ft_memcmp(const void *s1, const void *s2, size_t n)
+{
+	size_t	i;
+	int		result;
+
+	i = 0;
+	result = 0;
+	while (!result && i < n)
+	{
+		result = *((unsigned char *)s1 + i) - *((unsigned char *)s2 + i);
+		i++;
+	}
+	return (result);
+}
+
+/* #include <stdio.h> */
+
+/* int	main(void) */
+/* { */
+/* 	char	str1[] = "Hello"; */
+/* 	char	str2[] = "Hellu"; */
+
+/* 	printf("memcmp: %d\n", memcmp(str1, str2, 5)); */
+/* 	printf("ft_memcmp: %d\n", ft_memcmp(str1, str2, 5)); */
+/* } */
diff --git a/ft_memcpy.c b/ft_memcpy.c
new file mode 100644
index 0000000..49c4575
--- /dev/null
+++ b/ft_memcpy.c
@@ -0,0 +1,37 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memcpy.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/05 11:15:12 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/05 11:39:34 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <string.h>
+
+void	*ft_memcpy(void *restrict dst, const void *restrict src, size_t n)
+{
+	size_t	i;
+
+	i = 0;
+	while (i < n)
+	{
+		*((char *)dst + i) = *((char *)src + i);
+		i++;
+	}
+	return (dst);
+}
+
+/* #include <stdio.h> */
+/* int main(void) */
+/* { */
+/*     char src[] = "Test Hurra"; */
+/*     char src2[] = "Test Hurra"; */
+/*     char dst[] = "AAAAAAIIIIIEEEEE"; */
+/*     char dst2[] = "AAAAAAIIIIIEEEEE"; */
+/*     printf("ft_memcpy: %s\n", (char *) ft_memcpy(dst, src, 20)); */
+/*     printf("memcpy: %s\n", (char *) memcpy(dst2, src2, 20)); */
+/* } */
diff --git a/ft_memmove.c b/ft_memmove.c
new file mode 100644
index 0000000..9ca3fac
--- /dev/null
+++ b/ft_memmove.c
@@ -0,0 +1,48 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memmove.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/05 11:41:44 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 14:12:14 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <string.h>
+
+void	*ft_memmove(void *dst, const void *src, size_t len)
+{
+	size_t	i;
+
+	if (dst > src)
+	{
+		i = len;
+		while (i-- > 0)
+		{
+			*((char *)dst + i) = *((char *)src + i);
+		}
+	}
+	else
+	{
+		i = 0;
+		while (i < len)
+		{
+			*((char *)dst + i) = *((char *)src + i);
+			i++;
+		}
+	}
+	return (dst);
+}
+
+/* #include <stdio.h> */
+
+/* int	main(void) */
+/* { */
+/* 	char	text[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; */
+/* 	char	text2[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; */
+
+/* 	printf("memmove: %s\n", memmove(text + 5, text, 5)); */
+/* 	printf("ft_memmove: %s\n", ft_memmove(text2 + 5, text2, 5)); */
+/* } */
diff --git a/ft_memset.c b/ft_memset.c
new file mode 100644
index 0000000..618a78d
--- /dev/null
+++ b/ft_memset.c
@@ -0,0 +1,39 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memset.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/05 09:58:19 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/05 11:21:24 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <string.h>
+
+void	*ft_memset(void *b, int c, size_t len)
+{
+	char	*ptr;
+	size_t	i;
+
+	ptr = (char *)b;
+	i = 0;
+	while (i < len)
+	{
+		ptr[i] = (unsigned char)c;
+		i++;
+	}
+	return (b);
+}
+
+/* #include <stdio.h> */
+
+/* int	main(void) */
+/* { */
+/* 	char	str[] = "Hello world"; */
+
+/* 	printf("STR: %s\n", str); */
+/* 	printf("ft_memset: %s\n", ft_memset((char *)str, 'A' + 255, 5)); */
+/* 	printf("memset: %s\n", memset((char *)str, 'A' + 255, 5)); */
+/* } */
diff --git a/ft_putchar_fd.c b/ft_putchar_fd.c
new file mode 100644
index 0000000..1eca491
--- /dev/null
+++ b/ft_putchar_fd.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_putchar_fd.c                                    :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 20:36:14 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 20:38:06 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <unistd.h>
+
+void	ft_putchar_fd(char c, int fd)
+{
+    write(fd, &c, 1);
+}
diff --git a/ft_putendl_fd.c b/ft_putendl_fd.c
new file mode 100644
index 0000000..9929875
--- /dev/null
+++ b/ft_putendl_fd.c
@@ -0,0 +1,26 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_putendl_fd.c                                    :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 20:47:17 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 20:49:12 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <unistd.h>
+
+void	ft_putendl_fd(char *s, int fd)
+{
+	int	len;
+
+	len = 0;
+	while (s[len])
+	{
+		len++;
+	}
+	write(fd, s, len);
+	write(fd, "\n", 1);
+}
diff --git a/ft_putstr_fd.c b/ft_putstr_fd.c
new file mode 100644
index 0000000..3be5a70
--- /dev/null
+++ b/ft_putstr_fd.c
@@ -0,0 +1,23 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_putstr_fd.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 20:43:05 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 20:45:40 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <unistd.h>
+
+void	ft_putstr_fd(char *s, int fd)
+{
+	int	len;
+
+	len = 0;
+	while (s[len])
+		len++;
+	write(fd, s, len);
+}
diff --git a/ft_strchr.c b/ft_strchr.c
new file mode 100644
index 0000000..e53f78e
--- /dev/null
+++ b/ft_strchr.c
@@ -0,0 +1,33 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strchr.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 14:12:39 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 14:35:37 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+char	*ft_strchr(const char *s, int c)
+{
+	int	i;
+
+	i = 0;
+	while (s[i] != '\0')
+	{
+		if (s[i] == (char)c)
+			return ((char *)&s[i]);
+		i++;
+	}
+	return (0);
+}
+
+/* #include <stdio.h> */
+/* #include <string.h> */
+/* int main() { */
+/*     char str[] = "Hello world"; */
+/*     printf("strchr: %s\n", strchr(str, 'o')); */
+/*     printf("ft_strchr: %s\n", ft_strchr(str, 'o')); */
+/* } */
diff --git a/ft_strdup.c b/ft_strdup.c
new file mode 100644
index 0000000..af7ab12
--- /dev/null
+++ b/ft_strdup.c
@@ -0,0 +1,38 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strdup.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 19:54:16 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 20:24:51 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stdlib.h>
+
+char	*ft_strdup(const char *s1)
+{
+	char	*result;
+	int		len;
+
+	len = 0;
+	while (*(s1++))
+		len++;
+	result = malloc(len + 1);
+	if (!result)
+		return (0);
+	result[++len] = '\0';
+	while (len--)
+		result[len] = *(--s1);
+	return (result);
+}
+
+/* #include <stdio.h> */
+/* int main() { */
+/*     char *output; */
+/*     char input[] = "Dies ist ein Test."; */
+/*     output = ft_strdup(input); */
+/*     printf("%s\n", output); */
+/* } */
diff --git a/ft_strlcat.c b/ft_strlcat.c
new file mode 100644
index 0000000..c16105a
--- /dev/null
+++ b/ft_strlcat.c
@@ -0,0 +1,48 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strlcat.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 13:36:59 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 14:11:36 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <string.h>
+
+size_t	ft_strlcat(char *restrict dst, const char *restrict src, size_t dstsize)
+{
+	size_t	len;
+	size_t	i;
+
+	if (dstsize == 0)
+		return (0);
+	len = 0;
+	while (len < dstsize - 1 && dst[len] != '\0')
+	{
+		len++;
+	}
+	i = 0;
+	while (len < dstsize - 1 && src[i] != '\0')
+	{
+		dst[len] = src[i];
+		len++;
+		i++;
+	}
+	dst[len] = '\0';
+	return (len);
+}
+
+/* #include <stdio.h> */
+/* int main () { */
+/*     char dst[12] = "Hello "; */
+/*     char dst2[12] = "Hello "; */
+/*     char src[] = "World"; */
+
+/*     size_t len = strlcat(dst, src, 12); */
+/*     size_t len2 = ft_strlcat(dst2, src, 12); */
+/*     printf("strlcat (%zu): %s\n", len, dst); */
+/*     printf("ft_strlcat (%zu): %s\n", len2, dst2); */
+/* } */
diff --git a/ft_strlcpy.c b/ft_strlcpy.c
new file mode 100644
index 0000000..670bf18
--- /dev/null
+++ b/ft_strlcpy.c
@@ -0,0 +1,50 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strlcpy.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 12:45:25 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 13:30:25 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <string.h>
+
+size_t	ft_strlcpy(char *restrict dst, const char *restrict src, size_t dstsize)
+{
+	size_t	len;
+
+	len = 0;
+	if (dstsize > 0)
+	{
+		while (len < dstsize - 1 && src[len] != '\0')
+		{
+			dst[len] = src[len];
+			len++;
+		}
+		dst[len] = '\0';
+		while (src[len] != '\0')
+		{
+			len++;
+		}
+	}
+	return (len);
+}
+
+/* #include <stdio.h> */
+
+/* int	main(void) */
+/* { */
+/* 	char	src[] = "Hello"; */
+/* 	char	dst[] = "01234567890123456789"; */
+/* 	char	dst2[] = "01234567890123456789"; */
+/* 	size_t	len; */
+/* 	size_t	len2; */
+
+/* 	len = strlcpy(dst, src, 10); */
+/* 	len2 = ft_strlcpy(dst2, src, 10); */
+/* 	printf("strlcpy (%zu): %s\n", len, dst); */
+/* 	printf("ft_strlcpy (%zu): %s\n", len2, dst2); */
+/* } */
diff --git a/ft_strlen.c b/ft_strlen.c
new file mode 100644
index 0000000..e201765
--- /dev/null
+++ b/ft_strlen.c
@@ -0,0 +1,21 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strlen.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/04 21:29:35 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/04 21:31:24 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_strlen(const char *str)
+{
+	int	len;
+
+	len = 0;
+	while (str[len])
+		len++;
+	return (len);
+}
diff --git a/ft_strncmp.c b/ft_strncmp.c
new file mode 100644
index 0000000..2d54ec5
--- /dev/null
+++ b/ft_strncmp.c
@@ -0,0 +1,38 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strncmp.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 14:45:10 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 15:10:48 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <string.h>
+
+int	ft_strncmp(const char *s1, const char *s2, size_t n)
+{
+	int	result;
+
+	result = 0;
+	while (!result && n > 0 && (*s1 || *s2))
+	{
+		result = *s1 - *s2;
+		if (*s1)
+			s1++;
+		if (*s2)
+			s2++;
+		n--;
+	}
+	return (result);
+}
+
+/* #include <stdio.h> */
+/* int main() { */
+/*     char str1[] = "Hello"; */
+/*     char str2[] = "Hellu"; */
+/*     printf("strncmp: %d\n", strncmp(str1, str2, 5)); */
+/*     printf("ft_strncmp: %d\n", ft_strncmp(str1, str2, 5)); */
+/* } */
diff --git a/ft_strnstr.c b/ft_strnstr.c
new file mode 100644
index 0000000..b91d162
--- /dev/null
+++ b/ft_strnstr.c
@@ -0,0 +1,41 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strnstr.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 16:07:54 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 16:24:52 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <string.h>
+
+char	*ft_strnstr(const char *haystack, const char *needle, size_t len)
+{
+	size_t	i;
+	size_t	k;
+
+	i = 0;
+	while (i < len)
+	{
+		k = 0;
+		while (haystack[i + k] == needle[k])
+		{
+			k++;
+		}
+		if (!needle[k])
+			return ((char *)haystack + i);
+		i++;
+	}
+	return (0);
+}
+
+/* #include <stdio.h> */
+/* int main() { */
+/*     char haystack[] = "Hello world"; */
+/*     char needle[] = "d"; */
+/*     printf("strnstr: %s\n", strnstr(haystack, needle, 10)); */
+/*     printf("ft_strnstr: %s\n", ft_strnstr(haystack, needle, 10)); */
+/* } */
diff --git a/ft_strrchr.c b/ft_strrchr.c
new file mode 100644
index 0000000..e548f5b
--- /dev/null
+++ b/ft_strrchr.c
@@ -0,0 +1,38 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strrchr.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 14:25:30 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 14:35:16 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+char	*ft_strrchr(const char *s, int c)
+{
+	int		i;
+	char	*last_occurrence;
+
+	last_occurrence = 0;
+	i = 0;
+	while (s[i] != '\0')
+	{
+		if (s[i] == (char)c)
+			last_occurrence = (char *)&s[i];
+		i++;
+	}
+	return (last_occurrence);
+}
+
+/* #include <stdio.h> */
+/* #include <string.h> */
+
+/* int	main(void) */
+/* { */
+/* 	char	str[] = "Hello world"; */
+
+/* 	printf("strrchr: %s\n", strrchr(str, 'o')); */
+/* 	printf("ft_strrchr: %s\n", ft_strrchr(str, 'o')); */
+/* } */
diff --git a/ft_tolower.c b/ft_tolower.c
new file mode 100644
index 0000000..31e848f
--- /dev/null
+++ b/ft_tolower.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_tolower.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/04 21:49:28 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/06 11:49:49 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_tolower(int c)
+{
+	if (c >= 'A' && c <= 'Z')
+		return (c + 32);
+	return (c);
+}
diff --git a/ft_toupper.c b/ft_toupper.c
new file mode 100644
index 0000000..5082232
--- /dev/null
+++ b/ft_toupper.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_toupper.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/04 21:33:34 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/04 21:49:16 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_toupper(int c)
+{
+	if (c >= 'a' && c <= 'z')
+		return (c - 32);
+	return (c);
+}
diff --git a/libft.h b/libft.h
new file mode 100644
index 0000000..dbad3f8
--- /dev/null
+++ b/libft.h
@@ -0,0 +1,6 @@
+#ifndef LIBFT_H_
+#define LIBFT_H_
+
+
+
+#endif // LIBFT_H_