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/* $Header: /p/tcsh/cvsroot/tcsh/tc.nls.c,v 3.23 2010/02/12 22:17:20 christos Exp $ */
/*
* tc.nls.c: NLS handling
*/
/*-
* Copyright (c) 1980, 1991 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "sh.h"
RCSID("$tcsh: tc.nls.c,v 3.23 2010/02/12 22:17:20 christos Exp $")
#ifdef WIDE_STRINGS
# ifdef HAVE_WCWIDTH
# ifdef UTF16_STRINGS
int
xwcwidth (wint_t wchar)
{
wchar_t ws[2];
if (wchar <= 0xffff)
return wcwidth ((wchar_t) wchar);
/* UTF-16 systems can't handle these values directly in calls to wcwidth.
However, they can handle them as surrogate pairs in calls to wcswidth.
What we do here is to convert UTF-32 values >= 0x10000 into surrogate
pairs and compute the width by calling wcswidth. */
wchar -= 0x10000;
ws[0] = 0xd800 | (wchar >> 10);
ws[1] = 0xdc00 | (wchar & 0x3ff);
return wcswidth (ws, 2);
}
# else
#define xwcwidth wcwidth
# endif /* !UTF16_STRINGS */
# endif /* HAVE_WCWIDTH */
int
NLSWidth(Char c)
{
# ifdef HAVE_WCWIDTH
int l;
if (c & INVALID_BYTE)
return 1;
l = xwcwidth((wchar_t) c);
return l >= 0 ? l : 0;
# else
return iswprint(c) != 0;
# endif
}
int
NLSStringWidth(const Char *s)
{
int w = 0, l;
Char c;
while (*s) {
c = *s++;
#ifdef HAVE_WCWIDTH
if ((l = xwcwidth((wchar_t) c)) < 0)
l = 2;
#else
l = iswprint(c) != 0;
#endif
w += l;
}
return w;
}
#endif
Char *
NLSChangeCase(const Char *p, int mode)
{
Char c, *n, c2 = 0;
const Char *op = p;
for (; (c = *p) != 0; p++) {
if (mode == 0 && Islower(c)) {
c2 = Toupper(c);
break;
} else if (mode && Isupper(c)) {
c2 = Tolower(c);
break;
}
}
if (!*p)
return 0;
n = Strsave(op);
n[p - op] = c2;
return n;
}
int
NLSClassify(Char c, int nocomb)
{
int w;
if (c & INVALID_BYTE)
return NLSCLASS_ILLEGAL;
w = NLSWidth(c);
if ((w > 0 && !(Iscntrl(c) && (c & CHAR) < 0x100)) || (Isprint(c) && !nocomb))
return w;
if (Iscntrl(c) && (c & CHAR) < 0x100) {
if (c == '\n')
return NLSCLASS_NL;
if (c == '\t')
return NLSCLASS_TAB;
return NLSCLASS_CTRL;
}
#ifdef WIDE_STRINGS
if (c >= 0x1000000)
return NLSCLASS_ILLEGAL4;
if (c >= 0x10000)
return NLSCLASS_ILLEGAL3;
#endif
if (c >= 0x100)
return NLSCLASS_ILLEGAL2;
return NLSCLASS_ILLEGAL;
}
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