tc.nls.c revision 316958 
1/* $Header: /p/tcsh/cvsroot/tcsh/tc.nls.c,v 3.27 2016/07/17 15:02:44 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 3.27 2016/07/17 15:02:44 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 INVALID_BYTE != 0
68    if ((c & INVALID_BYTE) == INVALID_BYTE)	/* c >= INVALID_BYTE */
69#else
70    if (c & INVALID_BYTE)
71#endif
72	return 1;
73    l = xwcwidth((wchar_t) c);
74    return l >= 0 ? l : 0;
75# else
76    return iswprint(c) != 0;
77# endif
78}
79
80int
81NLSStringWidth(const Char *s)
82{
83    int w = 0, l;
84    Char c;
85
86    while (*s) {
87	c = *s++;
88#ifdef HAVE_WCWIDTH
89	if ((l = xwcwidth((wchar_t) c)) < 0)
90		l = 2;
91#else
92	l = iswprint(c) != 0;
93#endif
94	w += l;
95    }
96    return w;
97}
98#endif
99
100Char *
101NLSChangeCase(const Char *p, int mode)
102{
103    Char c, *n, c2 = 0;
104    const Char *op = p;
105
106    for (; (c = *p) != 0; p++) {
107        if (mode == 0 && Islower(c)) {
108	    c2 = Toupper(c);
109	    break;
110        } else if (mode && Isupper(c)) {
111	    c2 = Tolower(c);
112	    break;
113	}
114    }
115    if (!*p)
116	return 0;
117    n = Strsave(op);
118    n[p - op] = c2;
119    return n;
120}
121
122int
123NLSClassify(Char c, int nocomb, int drawPrompt)
124{
125    int w;
126#ifndef SHORT_STRINGS
127    if ((c & 0x80) != 0)		/* c >= 0x80 */
128	return NLSCLASS_ILLEGAL;
129#endif
130    if (!drawPrompt) {			/* draw command-line */
131#if INVALID_BYTE != 0
132	if ((c & INVALID_BYTE) == INVALID_BYTE)		/* c >= INVALID_BYTE */
133	    return NLSCLASS_ILLEGAL;
134	if ((c & INVALID_BYTE) == QUOTE && (c & 0x80) == 0)	/* c >= QUOTE */
135	    return 1;
136	if (c >= 0x10000000)		/* U+10000000 = FC 90 80 80 80 80 */
137	    return NLSCLASS_ILLEGAL5;
138	if (c >= 0x1000000)		/*  U+1000000 = F9 80 80 80 80 */
139	    return NLSCLASS_ILLEGAL4;
140	if (c >= 0x100000)		/*   U+100000 = F4 80 80 80 */
141	    return NLSCLASS_ILLEGAL3;
142#endif
143	if (c >= 0x10000)		/*    U+10000 = F0 90 80 80 */
144	    return NLSCLASS_ILLEGAL2;
145    }
146    if (Iscntrl(c) && (c & CHAR) < 0x100) {
147	if (c == '\n')
148	    return NLSCLASS_NL;
149	if (c == '\t')
150	    return NLSCLASS_TAB;
151	return NLSCLASS_CTRL;
152    }
153    w = NLSWidth(c);
154    if (drawPrompt) {			/* draw prompt */
155	if (w > 0)
156	    return w;
157	if (w == 0)
158	    return 1;
159    }
160    if ((w > 0 && !(Iscntrl(c) && (c & CHAR) < 0x100)) || (Isprint(c) && !nocomb))
161	return w;
162    return NLSCLASS_ILLEGAL;
163}
164