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Linkedin 42

ft_libft

The first project at 42, libft, involves learning how the standard functions of C programming work by writing them from scratch and creating a personal library. This project is vital as the library will be used in future assignments at 42.

Program name libft.a
Turn in files Makefile, libft.h, ft_*.c
Makefile NAME, all, clean, fclean, re
External functs Detailed below (libc, add, bonus)
Libft authorized n/a
Description Write your own library: a collection of functions that will be a useful tool for your cursus.
  • Mandatory part
    • Part 1: libc functions, recreate functions on ctyphe.h, string.h & strings.h
      • ft_isalpha
      • ft_isdigit
      • ft_isalnum
      • ft_isascii
      • ft_toupper
      • ft_tolower
      • ft_strlen
      • ft_strlcpy
      • ft_strlcat
      • ft_strchr
      • ft_strrchr
      • ft_strncmp
      • ft_strnstr
      • ft_calloc
      • ft_memset
      • ft_bzero
      • ft_memcpy
      • ft_memmove
      • ft_memchr
      • ft_memcmp
      • ft_strdup
      • ft_atoi
    • Part 2: additional functions
      • ft_substr
      • ft_strjoin
      • ft_strtrim
      • ft_split
      • ft_strmapi
      • ft_itoa
      • ft_putchar_fd
      • ft_putstr_fd
      • ft_putendl_fd
      • ft_putnbr_fd
  • Bonus part, linked lists
    • ft_lstnew
    • ft_lstadd_front
    • ft_lstsize
    • ft_lstlast
    • ft_lstadd_back
    • ft_lstdelone
    • ft_lstclear
    • ft_lstiter
    • ft_lstmap
  • Other functions added to the library (included after validating the project on the intra)

How to use

Compilation

1 - Clone de repository

git clone git@github.com:mxvements/ft_libft.git

2 - Enter the project folder and run make, makefile rules

`make` - compile libft mandatory files
`make bonus` - compile libft bonus files
`make all` - compile all (mandatory + bonus) files
`make clean` - delete all *.o files
`make fclean` - delete all *.o & *.a (executable) files
`make re` - use fclean + all, recompile libft
`make test` - added rule, compile test_libft.c file (main w/ tester functs on libc)
`make tclean` - added rule, delete all *.o & clean *.out file from test

3 - To include it in your code, include the header

#include 'libft.h"

Mandatory part

Check and manipulate characters

Name Library Prototype Short description Dependencies
ft_isalpha ctype.h int ft_isalpha(int c) Test for any character for whis isupper or islower is true. Returns: (0) if false, (non-zero) if true ft_isupper*, ft_islower*
ft_isdigit ctype.h int ft_isdigit(int c) Test for decimal digit character (ascii 48..57). Return: (0) if false, (non-zero) if true
ft_isalnum ctype.h int ft_isalnum(int c) Tests for any character or which isalpha or isdigit is true. Return: (0) if false, (non-zero) if true. ft_isdigit, ft_isalpha
ft_isascii ctype.h int ft_isascii(int c) Test for ascii character (dec 0..127 included). Return: (0) if false, (non-zero) if true
ft_isprint ctype.h int ft_isprint(int c) Tets for any printing character (ascii dec 32..136). Return: (0) if false, (nonzero) if true
ft_toupper ctype.h int ft_toupper(int c) Converts lower-case to the corresponding upper-case. Return: the corresponding upper-case char, otherwise the argument is returned unchanged (was already uppercase or not a char) ft_islower*
ft_tolower ctype.h int ft_tolower(int c) Converts upper-case to the corresponding lower-case. Return: the corresponding lower-case char, otherwise the argument is returned unchanged (was already lower-case or not a char) ft_isupper*

Manipulate strings

Name Library Prototype Short description Dependencies
ft_strlen string.h size_t strlen(const char *s) compute the length of s, number of characters that preecede NULL character -
ft_strlcpy string.h size_t ft_strlcpy(char *dst, const char *src, size_t dstsize) size-bounded string copying, copies up to (len -1) size != 0 from src to dst, NULL terminating the result if ft_strlen(src)
ft_strlcat string.h size_t ft_strlcat(char *dst, const char *src, size_t size) size-bounded string copying and concatenation, appends string src to the end of dst, it will append at most size - strlen(dst) -1 -
ft_strchr string.h char *ft_strchr(const char *s, int c) locates the char (ascii representation) 'c' in 's' the terminating null is considered as part of the string -
ft_strrchr string.h char *strrchr(const char *s, int c) locate character in string, the last occurrence of c -
ft_strncmp string.h int ft_strncmp(const char *s1, const char *s2, size_t n) compare strings, not more than n characters compare strings, not more than n characters, the comparison is done using unsigned characters -
ft_strnstr string.h char *ft_strnstr(const char *haystack, const char *needle, size_t len) locates the first occurrence of the null-terminate string needle' in the string 'haystack', where not more than 'len' characters are searched. -
ft_substr - char *ft_substr(char const *s, unsigned int start, size_t len) allocates (with malloc(3)) and returns a substring from 's' the substring begins at start and is max of size len malloc
ft_strjoin - char *ft_strjoin(char const *s1, char const *s2) allocates (with malloc(3)) and returns a new sring, which is the result of the concatenation of s1 and s2 malloc
ft_strtrim - char *ft_strtrim(char const *s1, char const *set) allocates (with malloc(3)) and returns a copy of s1 with the characters specified in 'set' removed from the beginning and the end of the string malloc, ft_strlen, ft_substr, ft_getfirstindex, ft_getlastindex, ft_strchr
ft_split - char **ft_split(char const *s, char c) allocates (with malloc(3)) and returns an array of strings obtained by splitting 's' using the character 'c' as a delimiter. The array must end with a NULL pointer. malloc, ft_strtrimwrapper, t_substr, ft_countwords
ft_strmapi - char *ft_strmapi(char const *s, char (*f)(unsigned int, char)) applies 'f' to each character of 's', and passing its index as first argument to create a new string malloc (w/ malloc) resulting from successive applications of 'f'
ft_striteri - ft_striteri(char *s, void (f)(unsigned int, char)) applies 'f' on each character of the string passed as argument, passing its index as first argument. -

Manipulate numbers

Name Library Prototype Short description Dependencies
ft_atoi stdlib.h int atoi(const char *str) convert initial portion of str to int representation ft_isspace, ft_isdigit
ft_itoa - char *ft_itoa(int n) allocates (with malloc(3)) and returns a string representing the int received as an argument. Negative numbers must be handled. malloc, ft_countdigits

Manipulate memory

Name Library Prototype Short description Dependencies
ft_memset string.h void *memset(void *b, int c, size_t len) writes 'len' bytes of value 'c '(converted to unsigned char) to the str 'b'. -
ft_bzero strings.h void (void *s, size_t n) erases the data int the 'n' bytes of the memory starting ft_memset at the location pointed by 's', by writing '0' in the area
ft_memcpy string.h void *memcpy(void *dst, void *src, size_t n) copy 'n' bytes from 'src' to 'dst' f 'dst' and 'src' overlap, behaviour is undefined -
ft_memmove string.h void *memmove(void *dst, const void *src, size_t n) copy 'n' bytes from src to dst if 'src' and 'dst' overlap, the copy is always done in a non-destructive manner (memory safe) ft_memcpy
ft_memchr string.h void *ft_memchr(const void *s, int c, size_t n) scans 'n' bytes form 's' to search for the 1st instance of 'c', both c and s are interpreted as unsigned char -
ft_memcmp string.h int ft_memcmp(const void *s1, const void *s2, size_t n) compare byte string 's1' against 's2', both assumed 'n' bytes long -
ft_calloc stdlib.h void *calloc(size_t count, size_t size) memory allocation with enough space for count objects that are size bytes of memory each and returns a pointerto the allocated memory filled with bytes of i value (0) malloc
ft_strdup string.h char *ft_strdup(const char *s1) saves a cpy of the str 's1', allocating anough memory, doing the copy and returning the ptr to it. allocates at most 'n' char from 's1' always terminating the copied str. malloc

Write to a file descriptor

Name Library Prototype Short description Dependencies
ft_putchar_fd - void ft_putchar_fd(hcar c, int fd) outputs the char 'c' to the given file descriptor write
ft_putstr_fd - void ft_putstr_fd(char *s, int fd) outputs the string 's' to the given file descriptor write
ft_putendl_fd - void ft_putendl_fd(char *s, int fd) ouputs the string 's' to the given file descriptor followed by a new line write
ft_putnbr_fd - void ft_putnbr_fd(int n, int fd); outputs the integer 'n' to the given file descriptor write

Bonus

Manipulate linked lists

Name Library Prototype Short description Dependencies
ft_lstnew - t_list *ft_lstnew(void *content) allocates (with malloc(3)) and returns a new node. the member variable 'content' is inizialized with the value of the param 'content', the variable 'next' is initilized to NULL malloc
ft_lstadd_front - void ft_lstadd_front(t_list **lst, t_list *new) ads the node 'new' at the beginning of the list -
ft_lstsize - int ft_lstsize(t_lst *lst) counts the number of nodes in a list -
ft_lstlast - t_list ft_llstlast(t_list *lst) return the last node of the list -
ft_lstadd_back - void ft-lstadd_back(t_list **lst, t_list *new) adds the node 'new' at the end of the list -
ft_lstdelone - void ft_lstdelone(t_list *lst, void (del)(void)) takes as parameter the node and frees the memory of the node's content using the function 'del' given as a param and free the node, the memory 'next' must not be freed. free
ft_lstclear - void ft_lstclear(t_list **lst, void (*del)(void *)) deletes and frees the given node and every successor of that node, using the function 'del' and free(3) free
ft_lstiter - void ft_lstiter(t_list *lst, void (*f)(void *)) iterates the list 'lst' and applies the function 'f' on the content of each node. -
ft_lstmap - t_list *ft_lstmap(t_list *lst, void *(*f)(void *), void (*del)(void *)) iterates the list 'lst' and applies the funcion 'f' on the content of each node. creates a new list resulting of the successive applications of the function 'f' the 'del' function is used to delete the content of a node if needed malloc, free, ft_lstnew, ft_lstclear, ft_lstadd_back

Other

Norminete

At 42 School, it is expected that almost every project is written in accordance with the Norm, which is the coding standard of the school.

Norminette's repository
- No for, do...while, switch, case, goto, ternary operators and variable-length arrays are allowed
- Each function must be a maximum of 25 lines, not counting the function's curly brackets
- Each line must be at most 80 columns wide, comments included
- A function can take 4 named parameters maximum
- No assigns and declarations in the same line (unless static or const)
- You can't declare more than 5 variables per function
- ...

License

MIT License

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