Module: libc.ctype

Source: ./libc/ctype.reef

Overview

libc.ctype - C character type functions (FFI)

Raw libc <ctype.h> FFI. This is a BINDING, not a peer of core.chars: the predicates return int (C's nonzero-is-true), not bool, so they do not compose with Reef conditionals the way core.chars does — write libc.ctype.isdigit(c) != 0, never if libc.ctype.isdigit(c). Case conversion (toupper/tolower) does return char.

Stdlib and applications should use core.chars, which is the one character library (0.9.2 C4) and is pure Reef. Reach for this module only for direct libc access in performance-critical code, and only on a hosted target: it is NOT available freestanding, since it links against the C library.

Functions

fn toupper(c: int): int

fn tolower(c: int): int

fn isalpha(c: int): int

fn isdigit(c: int): int

fn isalnum(c: int): int

fn isspace(c: int): int

fn isupper(c: int): int

fn islower(c: int): int

fn isprint(c: int): int

fn ispunct(c: int): int

fn toupper(c: char): char

Converts lowercase letter to uppercase Non-lowercase characters are returned unchanged

fn tolower(c: char): char

Converts uppercase letter to lowercase Non-uppercase characters are returned unchanged

fn isalpha(c: char): int

Returns non-zero if c is an alphabetic character

fn isdigit(c: char): int

Returns non-zero if c is a digit ('0'-'9')

fn isalnum(c: char): int

Returns non-zero if c is alphanumeric

fn isspace(c: char): int

Returns non-zero if c is whitespace

fn isupper(c: char): int

Returns non-zero if c is uppercase

fn islower(c: char): int

Returns non-zero if c is lowercase

fn isprint(c: char): int

Returns non-zero if c is printable

fn ispunct(c: char): int

Returns non-zero if c is punctuation

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