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
35 RCSID("$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
41 int
xwcwidth(wint_t wchar)42 xwcwidth (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
62 int
NLSWidth(Char c)63 NLSWidth(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
80 int
NLSStringWidth(const Char * s)81 NLSStringWidth(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
100 Char *
NLSChangeCase(const Char * p,int mode)101 NLSChangeCase(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
122 int
NLSClassify(Char c,int nocomb,int drawPrompt)123 NLSClassify(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