45 lines
919 B
C
45 lines
919 B
C
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/*
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FUNCTION
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<<isspace>>---whitespace character predicate
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INDEX
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isspace
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ANSI_SYNOPSIS
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#include <ctype.h>
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int isspace(int <[c]>);
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TRAD_SYNOPSIS
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#include <ctype.h>
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int isspace(<[c]>);
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DESCRIPTION
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<<isspace>> is a macro which classifies ASCII integer values by table
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lookup. It is a predicate returning non-zero for whitespace
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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
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undefining the macro using `<<#undef isspace>>'.
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RETURNS
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<<isspace>> returns non-zero if <[c]> is a space, tab, carriage return, new
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line, vertical tab, or formfeed (<<0x09>>--<<0x0D>>, <<0x20>>).
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PORTABILITY
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<<isspace>> is ANSI C.
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No supporting OS subroutines are required.
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*/
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#include <_ansi.h>
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#include <ctype.h>
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#undef isspace
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int
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_DEFUN(isspace,(c),int c)
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{
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return(__ctype_ptr__[c+1] & _S);
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}
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