introduction to libft(library of functions)

in this project we will be creating functions that can be used later in any of our c projects,some of them are already included in c standard libraries and some of them are a bit different. by we creating our own library function we get to understand deeply how main functions are working behind the scenes therefore we get a better understanding of the way that c language works.

the file structure for this project will be as following:

.c files

where all our c functions will be written in

.h (header file)

the header file is important to provide access to various functions from any file that the header is included in,that means we will not over write the function that we want to use in every file that doesn't include that specific function.
we can include all the headers that we will be using in our program in the .h file instead of including them in every file that our program has.

in this project the header file is going to have "libft.h" name, so make sure to include it in the c files in this way #include "libft.h".

makefile

A Makefile is a special file used in software development that contains a set of rules and dependencies to automate the build process of a program, ensuring that files are compiled in the correct order.

in summary the makefile is going to do:

compiling: it compiles all the files in our program at once.
cleaning:by running the "make clean" command, the make file will delete the object files, by running the "make fclean" command,the make file will delete the object files alongside the execuable file for our program.

this some of the things that the make file does , i will not be going to talk about it in detail, dont forget to make a Research about it for further understanding of it.

libft functions

mandatory part:

functions from `<ctype.h>`

ft_isalpha - checks for an alphabetical characters.
ft_isdigit - checks for digits (0-9).
ft_isalnum - checks for alphanumeric characters.
ft_isascii - checks whether a specific character fits into the ASCİİ character set.
ft_isprint - checks for any printable characters.
ft_toupper - converts characters to uppercase.
ft_tolower - converts characters to lowercase.

functions from `<string.h>`

ft_strlen - calculate the length of a string.
ft_memset - fills memory with a constent part.
ft_bzero - it zeros the bytes of a string.
ft_memcpy - is used to copy a block of memory from one location to another.
ft_memmove - is used to copy a block of memory from one location to another, even if the source and destination regions overlap.
ft_strlcpy - to copy string up to a specified size.
ft_strlcat - it conacatenate a string to another up to a specific size.
ft_strchr - finds specific character in a string.
ft_strrchr - locates where a specific character is last seen.
ft_strncmp - used for comparing two strings up to a specified number of characters. It returns an integer that indicates the relationship between the compared strings.
ft_memchr - find a character in a block of memory.
ft_memcmp - it compares two memories areas up to a specified number of bytes.
ft_strnstr - it locates a substring in a specific string.
ft_strdup - it duplicates a string passed as a parameter.

functions from `<stdlib.h>`

ft_atoi - convers a strings to integers.
ft_calloc - allocates memories and set its bytes to 0.

functions are not included in the standard libraries.

ft_strjoin - The purpose of ft_strjoin is to concatenate two strings together, producing a new string.
ft_strtrim - it trims characters from the beginning and end of a string based on a provided set of characters.
ft_substr - it returns a substring from a string.
ft_split - it splits a string according a character specified as a parameter.
ft_itoa - it converts integers into strings.
ft_strmapi - applies a function to each character of a string.
ft_striteri - iterates through each character in the string, applying a specified operation (provided as a function pointer f) along with its index.
ft_putchar_fd - it outputs a character to a specific file descriptor.
ft_putstr_fd - output a string to a file descriptor.
ft_putendl_fd - output a string to a file descriptor, followed by a new line.
ft_putnbr_fd - output a number to a file descriptor.

note📝:

i added a tester for the libft project👌🏻, it can be so useful to test your code before submitting it to the school.

yazan-metax/libft42