isascii.c from Gdb at Krugle
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/*
FUNCTION
<<isascii>>---ASCII character predicate
INDEX
isascii
ANSI_SYNOPSIS
#include <ctype.h>
int isascii(int <[c]>);
TRAD_SYNOPSIS
#include <ctype.h>
int isascii(<[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.
*/
#include <_ansi.h>
#include <ctype.h>
#undef isascii
int
_DEFUN(isascii,(c),int c)
{
return c >= 0 && c< 128;
}
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