tc.nls.c revision 167465 
1/* $Header: /p/tcsh/cvsroot/tcsh/tc.nls.c,v 3.21 2006/09/26 16:45:30 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 3.21 2006/09/26 16:45:30 christos Exp $")
36
37#ifdef WIDE_STRINGS
38int
39NLSWidth(Char c)
40{
41# ifdef HAVE_WCWIDTH
42    int l;
43    if (c & INVALID_BYTE)
44	return 1;
45    l = wcwidth(c);
46    return l >= 0 ? l : 0;
47# else
48    return iswprint(c) != 0;
49# endif
50}
51
52int
53NLSStringWidth(const Char *s)
54{
55    int w = 0, l;
56    Char c;
57
58    while (*s) {
59	c = *s++;
60#ifdef HAVE_WCWIDTH
61	if ((l = wcwidth(c)) < 0)
62		l = 2;
63#else
64	l = iswprint(c) != 0;
65#endif
66	w += l;
67    }
68    return w;
69}
70#endif
71
72Char *
73NLSChangeCase(const Char *p, int mode)
74{
75    Char c, *n, c2 = 0;
76    const Char *op = p;
77
78    for (; (c = *p) != 0; p++) {
79        if (mode == 0 && Islower(c)) {
80	    c2 = Toupper(c);
81	    break;
82        } else if (mode && Isupper(c)) {
83	    c2 = Tolower(c);
84	    break;
85	}
86    }
87    if (!*p)
88	return 0;
89    n = Strsave(op);
90    n[p - op] = c2;
91    return n;
92}
93
94int
95NLSClassify(Char c, int nocomb)
96{
97    int w;
98    if (c & INVALID_BYTE)
99	return NLSCLASS_ILLEGAL;
100    w = NLSWidth(c);
101    if ((w > 0 && !(Iscntrl(c) && (c & CHAR) < 0x100)) || (Isprint(c) && !nocomb))
102	return w;
103    if (Iscntrl(c) && (c & CHAR) < 0x100) {
104	if (c == '\n')
105	    return NLSCLASS_NL;
106	if (c == '\t')
107	    return NLSCLASS_TAB;
108	return NLSCLASS_CTRL;
109    }
110#ifdef WIDE_STRINGS
111    if (c >= 0x1000000)
112	return NLSCLASS_ILLEGAL4;
113    if (c >= 0x10000)
114	return NLSCLASS_ILLEGAL3;
115#endif
116    if (c >= 0x100)
117	return NLSCLASS_ILLEGAL2;
118    return NLSCLASS_ILLEGAL;
119}
120