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44 lines
863 B
C
44 lines
863 B
C
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/*
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FUNCTION
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<<isupper>>---uppercase character predicate
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INDEX
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isupper
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ANSI_SYNOPSIS
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#include <ctype.h>
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int isupper(int <[c]>);
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TRAD_SYNOPSIS
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#include <ctype.h>
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int isupper(<[c]>);
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DESCRIPTION
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<<isupper>> is a macro which classifies ASCII integer values by table
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lookup. It is a predicate returning non-zero for uppercase letters
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(<<A>>--<<Z>>), and 0 for other characters. It is defined only when
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<<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 isupper>>'.
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RETURNS
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<<isupper>> returns non-zero if <[c]> is a uppercase letter (A-Z).
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PORTABILITY
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<<isupper>> 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 isupper
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int
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_DEFUN(isupper,(c),int c)
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{
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return ((__ctype_ptr__[c+1] & (_U|_L)) == _U);
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}
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