| ISASCII(3) | Library Functions Manual | ISASCII(3) | 
isascii —
#include <ctype.h>
int
  
  isascii(int
    c);
isascii() function tests for an ASCII character,
  which is any character with a value in the range from 0 to 127, inclusive.
The isascii() function is defined on all
    integer values.
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.
| February 21, 2021 | NetBSD 10.0 |