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