42_M00-M01 C Library

Table of Contents

• Description
• Instructions
• Contents
  • libft
  • ft_printf
  • get_next_line
  • My own additions

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Description

This C library is a result of 3 of 42 school projects:

1. libft
2. ft_printf
3. get_next_line

The goal was to recode some of the well known and used public C libraries functions as well as some others. More detailed info below and in their own Readme files.

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Instructions

The project is compiled by using Makefile:

make / make all		# to compile the library
make clean			# to delete the temporary files
make fclean			# to delete the temporary files + the compiled library
make re				# to do make fclean and make all together

To use the functions from the library in your own project, add this include in your files:

#include "libft.a"

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Contents

M00: libft

[BONUS VERSION]

My takes on public C library functions:

int			ft_isalpha(int c);
int			ft_isalnum(int c);
int			ft_isascii(int c);
int			ft_isdigit(int c);
int			ft_isprint(int c);
int			ft_atoi(const char *str);
size_t		ft_strlen(const char *s);
int			ft_toupper(int c);
int			ft_tolower(int c);
void		ft_bzero(void *s, size_t n);
void		*ft_memset(void *s, int c, size_t n);
void		*ft_calloc(size_t nmemb, size_t size);
int			ft_strncmp(const char *s1, const char *s2, size_t n);
char		*ft_strnstr(const char *haystack, const char *needle, size_t n);
char		*ft_strchr(const char *s, int c);
char		*ft_strrchr(const char *s, int c);
void		*ft_memchr(const void *s, int c, size_t n);
int			ft_memcmp(const void *s1, const void *s2, size_t n);
void		*ft_memcpy(void *dest, const void *src, size_t n);
void		*ft_memmove(void *dest, const void *src, size_t n);
char		*ft_strdup(const char *src);
size_t		ft_strlcat(char *dst, const char *src, size_t dsize);
size_t		ft_strlcpy(char *dst, const char *src, size_t dsize);

Not public C library functions:

char		*ft_itoa(int n);
void		ft_putchar_fd(char c, int fd);
void		ft_putendl_fd(char *s, int fd);
void		ft_putnbr_fd(int n, int fd);
void		ft_putstr_fd(char *s, int fd);
char		**ft_split(char const *s, char c);
void		ft_striteri(char *s, void (*f)(unsigned int, char*));
char		*ft_strjoin(char const *s1, char const *s2);
char		*ft_strmapi(char const *s, char (*f)(unsigned int, char));
char		*ft_strtrim(char const *s1, char const *set);
char		*ft_substr(char const *s, unsigned int start, size_t len);

And for the bonus part: functions handling linked lists based on this structure:

struct s_list
{
	void			*content;
	struct s_list	*next;
}	t_list;

t_list		*ft_lstnew(void *content);
void		ft_lstadd_front(t_list **lst, t_list *new);
int			ft_lstsize(t_list *lst);
t_list		*ft_lstlast(t_list *lst);
void		ft_lstadd_back(t_list **lst, t_list *new);
void		ft_lstdelone(t_list *lst, void (*del)(void*));
void		ft_lstclear(t_list **lst, void (*del)(void*));
void		ft_lstiter(t_list *lst, void (*f)(void *));
t_list		*ft_lstmap(t_list *lst, void *(*f)(void *), void (*del)(void *));

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M01: ft_printf()

[BONUS VERSION]

A recode of classic printf() from stdio.h.

I chose to battle the infamous BONUS version which includes not only handling basic data type conversions:

• %c for character
• %s for string
• %p for pointer
• %d for decimal
• %i for integer
• %u for unsigned integer
• %x for hexadecimal in lowercase
• %X for hexadecimal in uppercase
• %% for % sign

but also:

• - flag for left padding
• 0 flag for zero padding
• . flag for precision
• # flag for hex prefix
• (space) flag for space
• + flag for explicit +
• field minimum width

It was tough, but I am really proud at myself and I learned so much from that. :)

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M01: get_next_line()

[BONUS VERSION]

A function that returns a line read from a file descriptor.

• Repeated calls (e.g., using a loop) to the get_next_line() function should let you read the text file pointed to by the file descriptor, one line at a time.
• The function should return the line that was read. If there is nothing left to read or if an error occurs, it should return NULL.

Tips for using the get_next_line() function in your code:

• Feel free to adjust the BUFFER_SIZE directly in the get_next_line.h. It is better when it is not too small (10 bytes and less) if you plan to read big files or long lines, because the process can be very time consuming with a small buffer.
• The function returns NULL when handed BUFFER_SIZE <= 0 and/or invalid fd argument.
• The function can accept stdin as input.
• The function can process multiple fd in one program simultaneously.
• Each call reads one line, for reading more, call the function repeatedly.
• To avoid undefined behaviour: do not modify the file associated with the file descriptor between calls when the end of file was yet not reached. Also do not put a binary file as an input.

Note: it is possible to change the separator character from \n to something else completely (f. e. space). So with a little adjustment of the code the function can be used in other ways.

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My own additions

When doing other projects I recoded and added some other useful functions:

int		ft_abs(int value);
long	ft_atol(const char *str);
int		ft_count_digits(int n);
int		ft_islower(int c);
int		ft_isupper(int c);
int		ft_putchar(char c);
void	ft_putendl(char *s);
int		ft_putnbr(int n);
int		ft_putstr(char *s);
int		ft_sqrt(int nb);
void	ft_strtoupper(char *s);
void	ft_strtolower(char *s);

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👤 Author

Simona Sucha (also known as ssucha or vincent_syma)
Python & C · Developer, Software Tester · 42 student

🖥️ GitHub: https://github.com/vincent-syma/
🔗 LinkedIn: https://www.linkedin.com/in/simona-such%C3%A1-5a1b1928b
✉️ Email: vincent.f.syma@email.cz