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ISASCII(3) Library Functions Manual ISASCII(3)

isascii — test for ASCII character

#include <ctype.h>

int
isascii(int c);;

The () function tests for an ASCII character, which is any character with a value less than or equal to 0177.

ctype(3), ascii(7)

The isascii() function conforms to ANSI X3.159-1989 (“ANSI C89”).

4.4BSD-Lite2 December 11, 1993 ISASCII(3)