Libft

This is my first project as a Cadet in 42 School São Paulo.

The goal of this project is to build my own C library. In order to accomplish it, I'll re-code some of the most important functions available on C Standard library among other useful functions suggested by 42 staff. As course goes, new functions will be added to fullfill the needs of my following projects.

Is functions

Function	Description
ft_isalnum	checks if a given character is alphabetical or numerical
ft_isalpha	checks if a given character is alphabetic
ft_isascii	checks if a given character is a ASCII
ft_isblank	checks for a blank character; that is, a space or a tab
ft_iscntrl	checks if a given character is NOT printable according to ASCII table
ft_isdigit	checks if a given character corresponds to a decimal digit character (48 to 57 at ASCII)
ft_isgraph	checks for any printable character except space
ft_islower	checks if a given character is a lower-case letter
ft_isnegative	checks if a number is negative
ft_isprime	returns 1 if a number is prime and 0 if is not
ft_isprint	tests if a character c is printable according to ASCII table, including space
ft_ispunct	checks for any printable character which is not a space or an alphanumeric character
ft_isspace	tests for white-space characters. That is: form-feed ('\f'), newline ('\n'), carriage return ('\r'), horizontal tab ('\t'), and vertical tab ('\v')
ft_isupper	tests if a given character is a upper-case letter
ft_isxdigit	checks for a hexadecimal digits, that is, one of 0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F

String functions

Function	Description
ft_split	splits a string using a given character as delimiter
ft_strcapitalize	capitalizes the first letter of each word and transforms all other letters to lowercase
ft_strupcase	converts a string to uppercase
ft_strlowcase	converts a string to lowercase
ft_strcat	appends one string to another
ft_strchr	finds the first occurrence of a given character in the string
ft_strcmp	compares two strings
ft_strcpy	copies one string to another
ft_strdup	duplicates a string
ft_strjoin	concatenates two strings and returns a new one
ft_strlcat	appends one string to another limited to a given lenght. It returns the combined length of both
ft_strlcpy	copies one string to another limited to a given lenght
ft_strlen	returns the length of the string
ft_strmapi	applies the function ’f’ to each character of the string
ft_strncat	appends most of n bytes from src string to another
ft_strncmp	compares the first n bytes of two strings
ft_strncpy	copies n bytes of a string to another
ft_strnstr	locates a substring in a string limited to n bytes
ft_strrchr	returns a pointer to the last occurrence of a character in a string
ft_strrev	reverses a string
ft_strstr	locates a substring in a string
ft_strtrim	trim beginning and end of string with the specified characters
ft_substr	gets a substring from a string
ft_count_words	counts how many words has a string
ft_gnl	reads every line of a file

Put functions

Function	Description
ft_putchar_fd	outputs a character to the given file descriptor
ft_putchar	writes a character to the standard output
ft_putendl_fd	outputs a string to a given file descriptor, followed by a newline
ft_putendl	outputs a string to the standard output, followed by a newline
ft_putlnbr	outputs a unsigned integer to the standard output
ft_putnbr_fd	outputs a integer to a given file descriptor
ft_putnbr	outputs a integer to the standard output
ft_putnstr	outputs a string to the standard output limited to n chars
ft_putstr_fd	outputs a string to a given file descriptor
ft_putstr	outputs a string to the standard output

Memory functions

Function	Description
ft_bzero	writes n zeroed bytes to the string s
ft_calloc	allocates the requested memory and returns a pointer to it
ft_memccpy	copies no more than n bytes from memory area src to memory area dst, stopping when the character c is found
ft_memchr	scans the initial n bytes of the memory area pointed to by s for the first instance of c
ft_memcmp	compares the first n bytes of the memory areas s1 and s2. It returns an integer less than, equal to, or greater than zero if the first n bytes of s1 is found, respectively, to be less than, to match, or be greater than the first n bytes of s2
ft_memcpy	copies n bytes from memory area src to memory area dst
ft_memmove	copies len bytes from memory area src to memory area dst. The memory areas may overlap: copying takes place as though the bytes in src are first copied into a temporary array that does not overlap src or dst, and the bytes are then copied from the temporary array to dst
ft_memset	fills the first len bytes of the memory area pointed to by b with the constant byte c

To functions

Function	Description
ft_atoi	converts the initial portion of the string pointed to by str into integer
ft_itoa	receives an integer and returns a string representing the integer received as an argument
ft_utoa_base	converts base of a unisgned integer
ft_tolower	converts uppercase letters to lowercase
ft_toupper	converts lowercase letters to uppercase

Digit functions

Function	Description
ft_div_mod	divides parameters a by b and stores the result in the int pointed by div. It also stores the remainder of the division of a by b in the int pointed by mod
ft_ultimate_div_mod	divides parameters a by b. The result of this division is stored in the int pointed by a. The remainder of the division is stored in the int pointed by b
ft_count_digit	counts how many digits the integer has
ft_swap	swaps the value of two integers

Math functions

Function	Description
ft_pow	returns the value of a power applied to a number
ft_sqrt	computes the square root of a number
ft_factorial	returns the result of a factorial operation based on the number given as a parameter
ft_fibonacci	returns the n-th element of the Fibonacci sequence, the first element being at the 0 index

Linked List functions

Function	Description
ft_lstadd_back	adds an element at the end a linked list
ft_lstadd_front	adds an element at the beginning of a linked list
ft_lstclear	deletes and frees the given element and every successor of that element
ft_lstdelone	takes as a parameter an element and frees the memory of the element’s content using the function ’del’ given as a parameter and free the element
ft_lstiter	iterates a linked list and applies the function ’f’ to the content of each element
ft_lstlast	returns the last element of the linked list
ft_lstmap	iterates the linked list and applies the function ’f’ to the content of each element. Creates a new list resulting of the successive applications of the function ’f’
ft_lstnew	creates a new linked list with the given element
ft_lstsize	counts the number of elements in a linked list

Makefile

Command	Usage
make	creates .o files for each function as well as the main library file, libft.a
make clean	removes the .o files used to create the library
make fclean	removes the .o & .a files used to create the library
make re	removes all .o & .a files then remakes them