isascii, isascii_l—ASCII character predicateSynopsis
#include <ctype.h> int isascii(int c); #include <ctype.h> int isascii_l(int c, locale_t locale);
Description
isascii is a macro which returns non-zero when c is an ASCII
character, and 0 otherwise. It is defined for all integer values.
isascii_l is like isascii but performs the check based on the
locale specified by the locale object locale. If locale is
LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
You can use a compiled subroutine instead of the macro definition by
undefining the macro using ‘#undef isascii’ or ‘#undef isascii_l’.
Returns
isascii, isascii_l return non-zero if the low order byte of c
is in the range 0 to 127 (0x00–0x7F).
Portability
isascii is ANSI C.
isascii_l is a GNU extension.
No supporting OS subroutines are required.