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C Library 📚 42's libft with descriptions to understand what each function does and how it works.

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# Libft - @42Born2Code
<img src="https://github.com/vvarodi/libft_42/blob/master/Libft.JPG" />

![Text](https://snipboard.io/DuJ8ON.jpg)

### TOC
* [What is libft?](#what-is-libft)
* [What's in it?](#whats-in-it)
* [List of functions](#list-of-functions)  Click to each function to see an explication

### What is libft?

Libft is an individual project at [42][1] that requieres us to re-create some standard C library functions for future projects, and have a deeper understanding of data structures and basic algorithms. At 42 we are not allowed to use some standard libraries on our projects, so we have to keep growing this libary with our own functions as we go farther in the program.

### What's in it?

There are 4 sections:

1.  **Libc Functions:** Some of the standard C functions
2.  **Additional functions:** Functions that will be useful for later projects
3.  **Bonus Functions:** Functions that will be useful for linked list manipulation
4.  **Personal Functions:** Functions I believe will be useful later.

### List of functions
Libc functions | Additional functions | Bonus Functions | Personal Functions
:----------- | :-----------: | :-----------: | -----------:
[ft_memset](#ft_memset)		|[ft_substr](#ft_substr)    | [ft_lstnew](#ft_lstnew)            | [ft_islower](#ft_islower) 
[ft_bzero](#ft_bzero)		|[ft_strjoin](#ft_strjoin)  | [ft_lstadd_front](#ft_lstadd_front)| [ft_isupper](#ft_isupper) 
[ft_memcpy](#ft_memcpy)		|[ft_strtrim](#ft_strjoin)  | [ft_lstsize](#ft_lstsize)          | [ft_isspace](#ft_isspace)   
[ft_memccpy](#ft_memccpy)	|[ft_split](#ft_split)      | [ft_lstlast](#ft_lstlast)          | [ft_strndup](#ft_strndup)
[ft_memmove](#ft_memmove)	|[ft_itoa](#ft_itoa)       | [ft_lstadd_back](#ft_lstadd_back)  | [ft_strcdup](#ft_strcdup)
[ft_memchr](#ft_memchr)		|[ft_strmapi](#ft_strmapi)  | [ft_lstdelone](#ft_lstdelone)     | 
[ft_memcmp](#ft_memcmp)		|[ft_putchar_fd](#ft_putchar_fd)| [ft_lstclear](#ft_lstclear)    | 
[ft_strlen](#ft_strlen)		|[ft_putstr_fd](#ft_putstr_fd)	| [ft_lstiter](#ft_lstiter)      | 
[ft_strdup](#ft_strdup)		|[ft_putendl_fd](#ft_putendl_fd)| [ft_lstmap](#ft_lstmap)        | 
[ft_strcpy](#ft_strcpy)		|[ft_putnbr_fd](#ft_putnbr_fd)	|				| 
[ft_strlcpy](#ft_strlcpy)	| 	|			| 
[ft_strcat](#ft_strcat)		| 	| | 
[ft_strlcat](#ft_strlcat)	| 	| | 
[ft_strchr](#ft_strchr)		| 	| | 
[ft_strrchr](#ft_strrchr)	| 	| | 
[ft_strstr](#ft_strstr)		|   | | 
[ft_strnstr](#ft_strnstr)	| 	| | 
[ft_strcmp](#ft_strcmp)		| 	| | 
[ft_strncmp](#ft_strncmp)	| 	| | 
[ft_atoi](#ft_atoi)         | 	| | 
[ft_isalpha](#ft_isalpha)	| 	| | 
[ft_isdigit](#ft_isdigit)	| 	| |
[ft_isalnum](#ft_isalnum)	|   | | 
[ft_isascii](#ft_isascii)	|   | | 
[ft_isprint](#ft_isprint)	|   | | 
[ft_toupper](#ft_toupper)   |   | | 
[ft_tolower](#ft_tolower)	|   | | 
[ft_calloc](#ft_calloc)     |   | |

## [ft_memset](libft/ft_memset.c)

`void       *ft_memset(void *s, int c, size_t len)`

## [ft_bzero](libft/ft_bzero.c)

`void       *ft_bzero(void *s,  size_t n)`

## [ft_memcpy](libft/ft_memcpy.c)

`void       *ft_memcpy(void *dst, const void *src, size_t n)`

## [ft_memccpy](libft/ft_memccpy.c)

`void       *ft_memccpy(void *dst, const void *src, int c, size_t n)`

## [ft_memmove](libft/ft_memmove.c)

`void       *ft_memmove(void *dst, const void *src, size_t len)`

## [ft_memchr](libft/ft_memchr.c)

`void       *ft_memchr(const void *s, int c, size_t n)`

## [ft_memcmp](libft/ft_memcmp.c)

`void       *ft_memcmp(void *dst, const void *src, size_t n)`

## [ft_strlen](libft/ft_strlen.c) 
`size_t     ft_strlen(const char *s)`

## [ft_strdup](libft/ft_strdup.c) 
`char       *ft_strdup(const char *s))`

## [ft_strndup](libft/ft_strndup.c)

`char       *ft_strndup(const char *s, size_t n)`

## [ft_strcdup](libft/ft_strcdup.c)

`char       *ft_strcdup(const char *s, int c)`

## [ft_strchr](libft/ft_strchr.c)

`char		*ft_strchr(const char *s, int c)`

Description | Param. #1 | Param. #2 | Return Value
:-----------: | :-----------: | :-----------: | :-----------:
Locates the first occurrence of 'c' in the string pointed to by 's'. The terminating null character is considered to be part of the string, therefore if 'c' is '\0', locates the terminating '\0'| Pointer to string | Character to be located | A pointer to the first occurrence of the character c in the string or NULL if the character is not found

## [ft_strrchr](libft/ft_strrchr.c)

`char		*ft_strrchr(const char *s, int c)`

Description | Param. #1 | Param. #2 | Return Value
:-----------: | :-----------: | :-----------: | :-----------:
Locates the last occurrence of 'c' in the string pointed to by 's'. The terminating null character is considered to be part of the string, therefore if 'c' is '\0', locates the terminating '\0'| Pointer to string | Character to be located | A pointer to the last occurrence of the character c in the string or NULL if the character is not found

## [ft_strcpy](libft/ft_strcpy.c)

`char       *ft_strcpy(char *dst, const char *src)`

## [ft_strlcpy](libft/ft_strlcpy.c)

`size_t     ft_strlcpy(char *dst, const char *src, size_t dstsize)`

## [ft_strcat](libft/ft_strcat.c)

`char       *ft_strcpy(char *dst, const char *src)`

## [ft_strlcat](libft/ft_strlcat.c)

`size_t     ft_strlcat(char *dst, const char *src, size_t size)`

## [ft_strstr](libft/ft_strstr.c)

`char       *ft_strstr(const char *haystack, const char *needle)`

Description | Param. #1 | Param. #2 | Return Value
:-----------: | :-----------: | :-----------: | :-----------:
Locate substring. Finds the first occurrence of the substring 'needle' in  the  string 'haystack'. The terminating null bytes ('\0') are not compared | String to be scanned | The small string to be searched in haystack string | A pointer to the beginning of the located substring. NULL if the substring is not found. If 'needle' is an empty string, 'haystack' is returned

## [ft_strnstr](libft/ft_strnstr.c)

`char       *ft_strnstr(const char *haystack, const char *needle, size_t len)`

Description | Param. #1 | Param. #2 | Param. #3 | Return Value
:-----------: | :-----------: | :-----------: | :-----------: | :-----------:
Locate substring, where not more than 'len' characters are searched. Finds the first occurrence of the substring 'needle' in  the  string 'haystack'. The terminating null bytes ('\0') are not compared. | String to be scanned | The small string to be searched in 'haystack' string|The maximum amount of characters to be searched |A pointer to the first character of the first occurrence of little is returned. NULL if the substring is not found. If 'needle' is an empty string, 'haystack' is returned

## [ft_atoi](libft/ft_atoi.c)

`int        ft_atoi(const char *str)`

## [ft_isalpha](libft/ft_isalpha.c)

`int        ft_isalpha(int c)`

## [ft_isdigit](libft/ft_isdigit.c)

`int         ft_isdigit(int c)`

## [ft_isalnum](libft/ft_isalnum.c)

`int        ft_isalnum(int c)`

## [ft_isascii](libft/ft_isascii.c)

`int        ft_isascii(int c)`

## [ft_isprint](libft/ft_isprint.c)

`int        ft_isprint(int c)`

## [ft_toupper](libft/ft_toupper.c)

`int        ft_toupper(int c)`

## [ft_tolower](libft/ft_tolower.c)

`int        ft_tolower(int c)`

## [ft_calloc](libft/ft_calloc.c)

`void       *ft_calloc(size_t count, size_t size)`

## [ft_substr]
`char   *ft_substr(char const *s, unsigned int start, size_t len)`

## [ft_strjoin]

`char *ft_strjoin(char const *s1, char const *s2)`

## [ft_strtrim]

`char *ft_strjoin(char const *s1, char const *s2)`

## [ft_strsplit]

`char **ft_split(char const *s, char c)`

## [ft_strmapi]

`char *ft_strmapi(char const *s, char (*f)(unsigned int, char))`

Description | Param. #1 | Param. #2 | Return Value
:-----------: | :-----------: | :-----------: | :-----------:
Applies the function f to each character of the string passed as argument to create a new string (with malloc) resulting from successive applications of f |The string on which to iterate| The function to apply to each character| The string created from the successive applications of f. Returns NULL if the allocation fails

## [ft_atoi]

`char   ft_itoa(int n)`

Description | Param. #1 | Return Value
:-----------: | :-----------: | :-----------:
Allocates (with malloc) and returns a string representing the integer received as an argument. Negative numbers must be handled | The integer to convert | The string representing the integer. NULL if the allocation fails.

## [ft_islower](libft/ft_islower.c)

`int  ft_islower(int c)`

## [ft_isupper](libft/ft_isupper.c)

`int ft_isupper(int c)`

## [ft_isspace](libft/ft_isspace.c)

`int ft_isspace(int c)`

Description | Param. #1 | Return Value
:-----------: | :-----------: | :-----------:
 Checks for white-space characters. These are: space, form-feed ('\f'), newline ('\n'),  carriage  return('\r'), horizontal tab ('\t'), and vertical tab ('\v').| The character to test | 0 if the character tests false and 1 if the character tests true

## ft_capitalize

`char  *ft_capitalize(char *s)`

[1]: https://www.42madrid.com/ 
[2]:

libft_42

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