ISASCII(3) Library Functions Manual ISASCII(3)
NAME
isasciitest for ASCII character
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h>
int
isascii(int c);
DESCRIPTION
The isascii() function tests for an ASCII character, which is any character with a value in the range from 0 to 127, inclusive.
 
The isascii() is defined on all integer values.
SEE ALSO
STANDARDS
The isascii() function conforms to X/Open Portability Guide Issue 4 (“XPG4”) and IEEE Std 1003.1-2001 (“POSIX.1”). The IEEE Std 1003.1-2008 (“POSIX.1”) revision however marked it as obsolete, noting that isascii() cannot be used portably in a localized application.