Character Functions

Character classification and conversion. More...

Functions
int	ft_isalnum (int c)
	Checks if a character is alphanumeric.
int	ft_isalpha (int c)
	Checks if a character is alphabetic.
int	ft_isascii (int c)
	Checks if a character is a valid ASCII character (0-127).
int	ft_isdigit (int c)
	Checks if a character is a digit ('0'-'9').
bool	ft_isincharset (char c, const char *charset)
	Checks if a character is present in a character set.
int	ft_isprint (int c)
	Checks if a character is printable (32-126).
int	ft_isspace (char c)
	Checks if a character is whitespace (9-13).
int	ft_tolower (int c)
	Converts an uppercase letter to lowercase.
int	ft_toupper (int c)
	Converts a lowercase letter to uppercase.

Detailed Description

Character classification and conversion.

Functions to test and transform individual characters.

Function Documentation

ft_isalnum()

int ft_isalnum

(

int

c

)

Checks if a character is alphanumeric.

Parameters

c	Character to check.

Returns

Non-zero if alphanumeric, 0 otherwise.

ft_isalpha()

int ft_isalpha

(

int

c

)

Checks if a character is alphabetic.

Parameters

c	Character to check.

Returns

Non-zero if alphabetic, 0 otherwise.

ft_isascii()

int ft_isascii

(

int

c

)

Checks if a character is a valid ASCII character (0-127).

Parameters

c	Character to check.

Returns

Non-zero if ASCII, 0 otherwise.

ft_isdigit()

int ft_isdigit

(

int

c

)

Checks if a character is a digit ('0'-'9').

Parameters

c	Character to check.

Returns

Non-zero if digit, 0 otherwise.

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ft_isincharset()

bool ft_isincharset	(	char	c,
		const char *	charset )

Checks if a character is present in a character set.

Parameters

c	Character to check.
charset	Null-terminated string of characters to match against.

Returns

true if found in charset, false otherwise.

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ft_isprint()

int ft_isprint

(

int

c

)

Checks if a character is printable (32-126).

Parameters

c	Character to check.

Returns

Non-zero if printable, 0 otherwise.

ft_isspace()

int ft_isspace

(

char

c

)

Checks if a character is whitespace (9-13).

Parameters

c	Character to check.

Returns

Non-zero if whitespace, 0 otherwise.

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ft_tolower()

int ft_tolower

(

int

c

)

Converts an uppercase letter to lowercase.

Parameters

c	Character to convert.

Returns

Lowercase equivalent if uppercase, otherwise unchanged.

ft_toupper()

int ft_toupper

(

int

c

)

Converts a lowercase letter to uppercase.

Parameters

c	Character to convert.

Returns

Uppercase equivalent if lowercase, otherwise unchanged.