NAME
isascii —
ASCII character test
SYNOPSIS
#include
<ctype.h>
int
isascii(int
c);
DESCRIPTION
The
isascii()
function tests for an ASCII character, which is any character with a value
less than or equal to 0177.
RETURN VALUES
The isascii() function returns zero if the
character tests false or non-zero if the character tests true.
SEE ALSO
isalnum(3), isalpha(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)
STANDARDS
The isascii() function conforms to
X/Open Portability Guide Issue 4
(“XPG4”).
HISTORY
The isascii() function first appeared in
Version 7 AT&T UNIX.
CAVEATS
The argument to isascii() must be
EOF or representable as an unsigned
char; otherwise, the result is undefined.