0,0 → 1,48 |
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/* |
FUNCTION |
<<iscntrl>>---control character predicate |
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INDEX |
iscntrl |
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ANSI_SYNOPSIS |
#include <ctype.h> |
int iscntrl(int <[c]>); |
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TRAD_SYNOPSIS |
#include <ctype.h> |
int iscntrl(<[c]>); |
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DESCRIPTION |
<<iscntrl>> is a macro which classifies ASCII integer values by table |
lookup. It is a predicate returning non-zero for control characters, and 0 |
for other characters. It is defined only when <<isascii>>(<[c]>) is |
true or <[c]> is EOF. |
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You can use a compiled subroutine instead of the macro definition by |
undefining the macro using `<<#undef iscntrl>>'. |
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RETURNS |
<<iscntrl>> returns non-zero if <[c]> is a delete character or ordinary |
control character (<<0x7F>> or <<0x00>>--<<0x1F>>). |
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PORTABILITY |
<<iscntrl>> is ANSI C. |
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No supporting OS subroutines are required. |
*/ |
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#include <_ansi.h> |
#include <ctype.h> |
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#undef iscntrl |
int |
_DEFUN(iscntrl,(c),int c) |
{ |
return(__ctype_ptr__[c+1] & _C); |
} |
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