📚 Your very first own library.
Libft is the first project of the 42cursus. The aim is to recode several functions from the standard C library and some additional functions that may be used throughout the course.
This project allows students to work with the basics of the language. Pointers, memory allocation, operations with data structures, as well as the creation of header and Makefile files.
- Algorithms & AI
- Imperative programming
- Rigor
Libc functions
| function | description |
|---|---|
| ft_isascii | tests if a given character, in the current locale, can be represented as a valid 7–bit US-ASCII character. |
| ft_isprint | checks whether a character is a printable character or not. |
| ft_isalpha | checks if the passed character is alphabetic.` |
| ft_isdigit | checks if the passed character is a decimal digit character. |
| ft_isalnum | checks if the passed character is alphanumeric. |
| ft_tolower | converts a given letter to lowercase. |
| ft_toupper | converts a given letter to uppercase. |
| ft_strlen | computes the length of the string str up to, but not including the terminating null character. |
| ft_strchr | searches for first occurrence of c in the string *str. |
| ft_strrchr | searches for the last occurrence of the character c (an unsigned char) in the string pointed to, by the argument str. |
| ft_strnstr | locates the first occurrence of the null-terminated string pointed by little in string pointed by big. Characters that appear after a '\0' or len are not searched. |
| ft_strncmp | compares at most the first n bytes of str1 and str2. |
| ft_strlcpy | copies up to size - 1 characters from the NUL-terminated string src to dest, NUL-terminating the result. |
| ft_strlcat | appends the NUL-terminated string src to the end of dest. It will append at most size - strlen(dst) - 1 bytes, NUL-terminating the result. |
| ft_strdup | returns a pointer to a new string duplicated of the string s. Memory for the new string is obtained with malloc. |
| ft_atoi | converts the initial portion of the string pointed to by str to int. |
| t_memset | fills memory with a constant byte. |
| ft_bzero | copies n bytes, each with a value of zero, into string s. |
| ft_memcpy | copies n bytes from memory area src to memory area dest. The memory areas must not overlap. Use ft_memmove if the memory areas do overlap. |
| ft_memmove | copies n bytes from memory area src to memory area dest and will not be corrupted if memory areas do overlap. |
| ft_memchr | Searches within the first n bytes of the block of memory pointed by str for the first occurrence of c (interpreted as an unsigned char), and returns a pointer to it. |
| ft_memcmp | compares n byte string s1 against n byte string s2. |
| ft_calloc | allocates size bytes and returns a pointer to the allocated memory. The memory is not initialized. |
Additional functions
In this second part, students must code a set of functions that are either not included in the libc, or included in a different form.
| function | description |
|---|---|
| ft_substr | allocates (with malloc) and returns a substring from the string s. The substring begins at index start and is of maximum size len. |
| ft_strjoin | allocates (with malloc) and returns a new string, which is the result of the concatenation of s1 and s2. |
| ft_strtrim | allocates (with malloc) and returns a copy of s1 with the characters specified in set removed from the beginning and the end of the string |
| ft_split | allocates (with malloc) and returns an array of strings obtained by splitting s using the character c as a delimiter. The array must beended by a NULL pointer. |
| ft_itoa | allocates (with malloc) and returns a string representing the integer received as an argument. Negative numbers must be handled. |
| ft_strmapi | applies the function f to each character of the string s to create a new string (with malloc) resulting from successive applications of f. |
| ft_striteri | applies the function f to each character of the string passed as argument, and passing its index as first argument. Each character is passed by address to f to be modified if necessary. |
| ft_putchar_fd | outputs the character c to the given file descriptor. |
| ft_putstr_fd | outputs the string s to the given file descriptor. |
| ft_putendl_fd | outputs the string s to the given file descriptor, followed by a newline. |
| ft_putnbr_fd | outputs the integer n to the given file descriptor. |