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ISASCII(3) Library Functions Manual ISASCII(3)

isasciitest for ASCII character

library “libc”

#include <ctype.h>

int
isascii(int c);

The () function tests for an ASCII character, which is any character between 0 and octal 0177 inclusive.

ctype(3), iswascii(3), ascii(7)

October 6, 2002 FreeBSD-12.0