RTEMS GNU Tools On-Line Library

isascii

2.3: `isascii`---ASCII character predicate

Synopsis

#include <ctype.h>
int isascii(int c);

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.

You can use a compiled subroutine instead of the macro definition by undefining the macro using `#undef isascii'.

Returns
isascii returns non-zero if the low order byte of c is in the range 0 to 127 (0x00--0x7F).

Portability
isascii is ANSI C.

No supporting OS subroutines are required.