/contrib/tcsh/tc.nls.c

  1/* $Header: /p/tcsh/cvsroot/tcsh/tc.nls.c,v 3.23 2010/02/12 22:17:20 christos Exp $ */
  2/*
  3 * tc.nls.c: NLS handling
  4 */
  5/*-
  6 * Copyright (c) 1980, 1991 The Regents of the University of California.
  7 * All rights reserved.
  8 *
  9 * Redistribution and use in source and binary forms, with or without
 10 * modification, are permitted provided that the following conditions
 11 * are met:
 12 * 1. Redistributions of source code must retain the above copyright
 13 *    notice, this list of conditions and the following disclaimer.
 14 * 2. Redistributions in binary form must reproduce the above copyright
 15 *    notice, this list of conditions and the following disclaimer in the
 16 *    documentation and/or other materials provided with the distribution.
 17 * 3. Neither the name of the University nor the names of its contributors
 18 *    may be used to endorse or promote products derived from this software
 19 *    without specific prior written permission.
 20 *
 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 31 * SUCH DAMAGE.
 32 */
 33#include "sh.h"
 34
 35RCSID("$tcsh: tc.nls.c,v 3.23 2010/02/12 22:17:20 christos Exp $")
 36
 37
 38#ifdef WIDE_STRINGS
 39# ifdef HAVE_WCWIDTH
 40#  ifdef UTF16_STRINGS
 41int
 42xwcwidth (wint_t wchar)
 43{
 44  wchar_t ws[2];
 45
 46  if (wchar <= 0xffff)
 47    return wcwidth ((wchar_t) wchar);
 48  /* UTF-16 systems can't handle these values directly in calls to wcwidth.
 49     However, they can handle them as surrogate pairs in calls to wcswidth.
 50     What we do here is to convert UTF-32 values >= 0x10000 into surrogate
 51     pairs and compute the width by calling wcswidth. */
 52  wchar -= 0x10000;
 53  ws[0] = 0xd800 | (wchar >> 10);
 54  ws[1] = 0xdc00 | (wchar & 0x3ff);
 55  return wcswidth (ws, 2);
 56}
 57#  else
 58#define xwcwidth wcwidth
 59#  endif /* !UTF16_STRINGS */
 60# endif /* HAVE_WCWIDTH */
 61
 62int
 63NLSWidth(Char c)
 64{
 65# ifdef HAVE_WCWIDTH
 66    int l;
 67    if (c & INVALID_BYTE)
 68	return 1;
 69    l = xwcwidth((wchar_t) c);
 70    return l >= 0 ? l : 0;
 71# else
 72    return iswprint(c) != 0;
 73# endif
 74}
 75
 76int
 77NLSStringWidth(const Char *s)
 78{
 79    int w = 0, l;
 80    Char c;
 81
 82    while (*s) {
 83	c = *s++;
 84#ifdef HAVE_WCWIDTH
 85	if ((l = xwcwidth((wchar_t) c)) < 0)
 86		l = 2;
 87#else
 88	l = iswprint(c) != 0;
 89#endif
 90	w += l;
 91    }
 92    return w;
 93}
 94#endif
 95
 96Char *
 97NLSChangeCase(const Char *p, int mode)
 98{
 99    Char c, *n, c2 = 0;
100    const Char *op = p;
101
102    for (; (c = *p) != 0; p++) {
103        if (mode == 0 && Islower(c)) {
104	    c2 = Toupper(c);
105	    break;
106        } else if (mode && Isupper(c)) {
107	    c2 = Tolower(c);
108	    break;
109	}
110    }
111    if (!*p)
112	return 0;
113    n = Strsave(op);
114    n[p - op] = c2;
115    return n;
116}
117
118int
119NLSClassify(Char c, int nocomb)
120{
121    int w;
122    if (c & INVALID_BYTE)
123	return NLSCLASS_ILLEGAL;
124    w = NLSWidth(c);
125    if ((w > 0 && !(Iscntrl(c) && (c & CHAR) < 0x100)) || (Isprint(c) && !nocomb))
126	return w;
127    if (Iscntrl(c) && (c & CHAR) < 0x100) {
128	if (c == '\n')
129	    return NLSCLASS_NL;
130	if (c == '\t')
131	    return NLSCLASS_TAB;
132	return NLSCLASS_CTRL;
133    }
134#ifdef WIDE_STRINGS
135    if (c >= 0x1000000)
136	return NLSCLASS_ILLEGAL4;
137    if (c >= 0x10000)
138	return NLSCLASS_ILLEGAL3;
139#endif
140    if (c >= 0x100)
141	return NLSCLASS_ILLEGAL2;
142    return NLSCLASS_ILLEGAL;
143}