OpenBSD manual page server
| ISASCII(3) |
Library Functions Manual |
ISASCII(3) |
isascii —
ASCII character test
#include <ctype.h>
int
isascii(int
c);
The isascii() function tests for an ASCII character,
which is any character with a value less than or equal to 0177.
The isascii() function returns zero if the character
tests false or non-zero if the character tests true.
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)
The isascii() function conforms to
X/Open Portability Guide Issue 4
(“XPG4”).
The isascii() function first appeared in
Version 7 AT&T UNIX.
The argument to isascii() must be
EOF or representable as an unsigned
char; otherwise, the result is undefined.