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/*
FUNCTION
<<toupper>>---translate characters to uppercase
INDEX
toupper
INDEX
_toupper
ANSI_SYNOPSIS
#include <ctype.h>
int toupper(int <[c]>);
int _toupper(int <[c]>);
TRAD_SYNOPSIS
#include <ctype.h>
int toupper(<[c]>);
int _toupper(<[c]>);
DESCRIPTION
<<toupper>> is a macro which converts lowercase characters to uppercase,
leaving all other characters unchanged. It is only defined when
<[c]> is an integer in the range <<EOF>> to <<255>>.
You can use a compiled subroutine instead of the macro definition by
undefining this macro using `<<#undef toupper>>'.
<<_toupper>> performs the same conversion as <<toupper>>, but should
only be used when <[c]> is known to be a lowercase character (<<a>>--<<z>>).
RETURNS
<<toupper>> returns the uppercase equivalent of <[c]> when it is a
character between <<a>> and <<z>>, and <[c]> otherwise.
<<_toupper>> returns the uppercase equivalent of <[c]> when it is a
character between <<a>> and <<z>>. If <[c]> is not one of these
characters, the behaviour of <<_toupper>> is undefined.
PORTABILITY
<<toupper>> is ANSI C. <<_toupper>> is not recommended for portable programs.
No supporting OS subroutines are required.
*/
#include <_ansi.h>
#include <ctype.h>
#if defined (_MB_EXTENDED_CHARSETS_ISO) || defined (_MB_EXTENDED_CHARSETS_WINDOWS)
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <wctype.h>
#include <wchar.h>
#endif
#undef toupper
int
_DEFUN(toupper,(c),int c)
{
#if defined (_MB_EXTENDED_CHARSETS_ISO) || defined (_MB_EXTENDED_CHARSETS_WINDOWS)
if ((unsigned char) c <= 0x7f)
return islower (c) ? c - 'a' + 'A' : c;
else if (c != EOF && MB_CUR_MAX == 1 && islower (c))
{
char s[MB_LEN_MAX] = { c, '\0' };
wchar_t wc;
if (mbtowc (&wc, s, 1) >= 0
&& wctomb (s, (wchar_t) towupper ((wint_t) wc)) == 1)
c = (unsigned char) s[0];
}
return c;
#else
return islower (c) ? c - 'a' + 'A' : c;
#endif
}
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