1/*
2 * tc.nls.c: NLS handling
3 */
4/*-
5 * Copyright (c) 1980, 1991 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32#include "sh.h"
33
34#ifdef WIDE_STRINGS
35# ifdef HAVE_WCWIDTH
36#  ifdef UTF16_STRINGS
37int
38xwcwidth (wint_t wchar)
39{
40  wchar_t ws[2];
41
42  if (wchar <= 0xffff)
43    return wcwidth ((wchar_t) wchar);
44  /* UTF-16 systems can't handle these values directly in calls to wcwidth.
45     However, they can handle them as surrogate pairs in calls to wcswidth.
46     What we do here is to convert UTF-32 values >= 0x10000 into surrogate
47     pairs and compute the width by calling wcswidth. */
48  wchar -= 0x10000;
49  ws[0] = 0xd800 | (wchar >> 10);
50  ws[1] = 0xdc00 | (wchar & 0x3ff);
51  return wcswidth (ws, 2);
52}
53#  else
54#define xwcwidth wcwidth
55#  endif /* !UTF16_STRINGS */
56# endif /* HAVE_WCWIDTH */
57
58int
59NLSWidth(Char c)
60{
61# ifdef HAVE_WCWIDTH
62    int l;
63#if INVALID_BYTE != 0
64    if ((c & INVALID_BYTE) == INVALID_BYTE)	/* c >= INVALID_BYTE */
65#else
66    if (c & INVALID_BYTE)
67#endif
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, int drawPrompt)
120{
121    int w;
122#ifndef SHORT_STRINGS
123    if ((c & 0x80) != 0)		/* c >= 0x80 */
124	return NLSCLASS_ILLEGAL;
125#endif
126    if (!drawPrompt) {			/* draw command-line */
127#if INVALID_BYTE != 0
128	if ((c & INVALID_BYTE) == INVALID_BYTE)		/* c >= INVALID_BYTE */
129	    return NLSCLASS_ILLEGAL;
130	if ((c & INVALID_BYTE) == QUOTE && (c & 0x80) == 0)	/* c >= QUOTE */
131	    return 1;
132	if (c >= 0x10000000)		/* U+10000000 = FC 90 80 80 80 80 */
133	    return NLSCLASS_ILLEGAL5;
134	if (c >= 0x1000000)		/*  U+1000000 = F9 80 80 80 80 */
135	    return NLSCLASS_ILLEGAL4;
136	if (c >= 0x100000)		/*   U+100000 = F4 80 80 80 */
137	    return NLSCLASS_ILLEGAL3;
138#endif
139	if (c >= 0x10000)		/*    U+10000 = F0 90 80 80 */
140	    return NLSCLASS_ILLEGAL2;
141    }
142    if (Iscntrl(c) && (c & CHAR) < 0x100) {
143	if (c == '\n')
144	    return NLSCLASS_NL;
145	if (c == '\t')
146	    return NLSCLASS_TAB;
147	return NLSCLASS_CTRL;
148    }
149    w = NLSWidth(c);
150    if (drawPrompt) {			/* draw prompt */
151	if (w > 0)
152	    return w;
153	if (w == 0)
154	    return 1;
155    }
156    if ((w > 0 && !(Iscntrl(c) && (c & CHAR) < 0x100)) || (Isprint(c) && !nocomb))
157	return w;
158    return NLSCLASS_ILLEGAL;
159}
160