0,0 → 1,43 |
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/* |
FUNCTION |
<<isupper>>---uppercase character predicate |
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INDEX |
isupper |
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ANSI_SYNOPSIS |
#include <ctype.h> |
int isupper(int <[c]>); |
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TRAD_SYNOPSIS |
#include <ctype.h> |
int isupper(<[c]>); |
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DESCRIPTION |
<<isupper>> is a macro which classifies ASCII integer values by table |
lookup. It is a predicate returning non-zero for uppercase letters |
(<<A>>--<<Z>>), 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 isupper>>'. |
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RETURNS |
<<isupper>> returns non-zero if <[c]> is a uppercase letter (A-Z). |
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PORTABILITY |
<<isupper>> is ANSI C. |
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No supporting OS subroutines are required. |
*/ |
#include <_ansi.h> |
#include <ctype.h> |
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#undef isupper |
int |
_DEFUN(isupper,(c),int c) |
{ |
return ((__ctype_ptr__[c+1] & (_U|_L)) == _U); |
} |
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