48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
/*
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FUNCTION
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<<isupper>>, <<isupper_l>>---uppercase character predicate
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INDEX
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isupper
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INDEX
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isupper_l
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SYNOPSIS
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#include <ctype.h>
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int isupper(int <[c]>);
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#include <ctype.h>
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int isupper_l(int <[c]>, locale_t <[locale]>);
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DESCRIPTION
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<<isupper>> is a macro which classifies singlebyte charset 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.
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<<isupper_l>> is like <<isupper>> but performs the check based on the
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locale specified by the locale object locale. If <[locale]> is
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LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
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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>>' or `<<#undef isupper_l>>'.
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RETURNS
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<<isupper>>, <<isupper_l>> return non-zero if <[c]> is an uppercase letter.
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PORTABILITY
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<<isupper>> is ANSI C.
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<<isupper_l>> is POSIX-1.2008.
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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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isupper (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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