Libft

Libft is a project for school 42 where we build our own library of functions. Some functions are copy of libs's funtionss (for pedagogique purpose) and other additional that will be usefull to use in other 42's project.

Only the function 'write', 'malloc' and 'free' are allowed.

libc function

The library contain copy of function from the libclist below. The functions have the same prototype and behavios as the original. The function's name are prefixed by "ft_" (with stand for Fourty Two). For instance strlen becomes ft_strlen.

List of libc function

• memset
• bzero
• memcpy
• memccpy
• memmove
• memchr
• memcmp
• strlen
• strdup
• strcpy
• strcat
• strncat
• strlcat
• strrchr
• strstr
• strnstr
• strcmp
• strncmp
• atoi
• isalpha
• isdigit
• isalnum
• isascii
• isprint
• toupper
• tolower

Additional function

ft_memalloc
Prototype	void * ft_memalloc(size_t size);
Description	Allocates (with malloc(3)) and returns a "fresh" memorry areaThe memory allocated is initialized to 0. If the allocation fails, the function returnas NULL.
Param #1	The size of the memory that needs to be allocated
Return value	The allocated memory area
Libc functions	malloc(3)

ft_memdel
Prototype	void ft_memdel(void **ap);
Description	Takes as a parameter the address of a memory area that needs to be freed with free(3), then puts the pointer to NULL.
Param #1	A pointer’s address that needs its memory freed and set to NULL.
Return value	None.
Libc functions	free(3).

ft_strnew
Prototype	char * ft_strnew(size_t size);
Description	Allocates (with malloc(3)) and returns a “fresh” string ending with ’\0’. Each character of the string is initialized at ’\0’. If the allocation fails the function returns NULL.
Param #1	The size of the string to be allocated.
Return value	The string allocated and initialized to 0.
Libc functions	malloc(3)

ft_strdel
Prototype	void ft_strdel(char **as);
Description	Takes as a parameter the address of a string that need to be freed with free(3), then sets its pointer to NULL.
Param #1	The string’s address that needs to be freed and its pointer set to NULL.
Return value	None.
Libc functions	Free(3).

ft_strclr
Prototype	void ft_strclr(char *s);
Description	Sets every character of the string to the value ’\0’.
Param #1	The string that needs to be cleared.
Return value	None.
Libc functions	None.

ft_striter
Prototype	void ft_striter(char *s, void (*f)(char *));
Description	AApplies the function f to each character of the string passed as argument. Each character is passed by address to f to be modified if necessary.
Param #1	The string to iterate.
Param #2	The function to apply to each character of s.
Return value	None.
Libc functions	None.

ft_striteri
Prototype	void ft_striteri(char *s, void (*f)(unsigned int, char *));
Description	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.
Param #1	The string to iterate.
Param #2	The function to apply to each character of s and its index.
Return value	None
Libc functions	None

ft_strmap
Prototype	char * ft_strmap(char const *s, char (*f)(char));
Description	Applies the function f to each character of the string given as argument to create a “fresh” new string (with malloc(3)) resulting from the successive applications of f.
Param #1	The string to map.
Param #2	The function to apply to each character of s
Return value	The “fresh” string created from the successive applications of f.
Libc functions	malloc(3)

ft_strmapi
Prototype	char * ft_strmapi(char const *s, char (*f)(unsigned int, char));
Description	Applies the function f to each character of the string passed as argument by giving its index as first argument to create a “fresh” new string (with malloc(3)) resulting from the successive applications of f.
Param #1	The string to map.
Param #2	The function to apply to each character of s and its index.
Return value	The “fresh” string created from the successive applications of f.
Libc functions	malloc(3)

ft_strqu
Prototype	int ft_strequ(char const *s1, char const *s2);
Description	Lexicographical comparison between s1 and s2. If the 2 strings are identical the function returns 1, or 0 otherwise.
Param #1	The first string to be compared.
Param #2	The second string to be compared.
Return value	1 or 0 according to if the 2 strings are identical or not.
Libc functions	None.

ft_strnqu
Prototype	int ft_strnequ(char const *s1, char const *s2,size_t n);
Description	Lexicographical comparison between s1 and s2 up to n characters or until a ’\0’ is reached. If the 2 strings are identical, the function returns 1, or 0 otherwise.
Param #1	The first string to be compared.
Param #2	The second string to be compared.
Param #3	The maximum number of characters to be compared.
Return value	1 or 0 according to if the 2 strings are identical or not.
Libc functions	None.

ft_strsub
Prototype	char * ft_strsub(char const *s, unsigned int start, size_t len);
Description	Allocates (with malloc(3)) and returns a “fresh” substring from the string given as argument. The substring begins at indexstart and is of size len. If start and len aren’t refering to a valid substring, the behavior is undefined. If the allocation fails, the function returns NULL.
Param #1	The string from which create the substring.
Param #2	The start index of the substring.
Param #3	The size of the substring.
Return value	The substring.
Libc functions	malloc(3)

ft_strjoin
Prototype	char * ft_strjoin(char const *s1, char const *s2);
Description	Allocates (with malloc(3)) and returns a “fresh” string ending with ’\0’, result of the concatenation of s1 and s2. If the allocation fails the function returns NULL.
Param #1	The prefix string.
Param #2	The suffix string
Return value	The “fresh” string result of the concatenation of the 2 strings.
Libc functions	malloc(3)

ft_strtrim
Prototype	char * ft_strtrim(char const *s);
Description	Allocates (with malloc(3)) and returns a copy of the string given as argument without whitespaces at the beginning or at the end of the string. Will be considered as whitespaces the following characters ’ ’, ’\n’ and ’\t’. If s has no whitespaces at the beginning or at the end, the function returns a copy of s. If the allocation fails the function returns NULL.
Param #1	The string to be trimed.
Return value	The “fresh” trimmed string or a copy of s.
Libc functions	malloc(3)

t_strsplit
Prototype	char ** ft_strsplit(char const *s, char c);
Description	Allocates (with malloc(3)) and returns an array of “fresh” strings (all ending with ’\0’, including the array itself) obtained by spliting s using the character c as a delimiter. If the allocation fails the function returns NULL. Example : ft_strsplit("*hellofellow*students", ’*’) returns the array ["hello", "fellow", "students"].
Param #1	The string to split.
Param #1	The delimiter character.
Return value	The allocated memory area
Libc functions	malloc(3), free(3)

ft_itoa
Prototype	char * ft_itoa(int n);
Description	Allocate (with malloc(3)) and returns a “fresh” string ending with ’\0’ representing the integer n given as argument. Negative numbers must be supported. If the allocation fails, the function returns NULL.
Param #1	The integer to be transformed into a string.
Return value	The string representing the integer passed as argument.
Libc functions	malloc(3)

ft_putchar
Prototype	void ft_putchar(char c);
Description	Outputs the character c to the standard output.
Param #1	The character to output
Return value	None.
Libc functions	write(2).

ft_putstr
Prototype	void ft_putstr(char const *s);
Description	Outputs the string s to the standard output.
Param #1	The string to output.
Return value	None.
Libc functions	write(2).

ft_putendl
Prototype	void ft_putendl(char const *s);
Description	Outputs the string s to the standard output followed by a ’\n’.
Param #1	The string to output.
Return value	None.
Libc functions	write(2).

ft_putnbr
Prototype	void ft_putnbr(int n);
Description	OOutputs the integer n to the standard output.
Param #1	The integer to output.
Return value	None.
Libc functions	write(2).

ft_putchar_fd
Prototype	void ft_putchar_fd(char c, int fd);
Description	Outputs the char c to the file descriptor fd.
Param #1	The character to output
Param #2	The file descriptor
Return value	None.
Libc functions	write(2).

ft_putstr_fd
Prototype	void ft_putstr_fd(char const *s, int fd);
Description	Outputs the string s to the file descriptor fd.
Param #1	The string to output.
Param #2	The file descriptor
Return value	None.
Libc functions	write(2).

ft_putendl_fd
Prototype	void ft_putendl_fd(char const *s, int fd);
Description	Outputs the string s to the file descriptor fd followed by a ’\n’.
Param #1	The string to output.
Param #2	The file descriptor
Return value	None.
Libc functions	write(2).

ft_putnbr_fd
Prototype	void ft_putnbr_fd(int n, int fd);
Description	Outputs the integer n to the file descriptor fd.
Param #1	The integer to print.
Param #2	The file descriptor
Return value	None.
Libc functions	write(2).

get_next_line

See Readme of get_next_line project

ft_printf

See Readme of ft_printf

How to use

You may compile libft.a by running make

Usage

#include "libft.h"

Author

Romain Fibigr : rfibigr@student.42.fr