1 /* $NetBSD: chartype.c,v 1.35 2019/07/23 10:18:52 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2009 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /*
30 * chartype.c: character classification and meta information
31 */
32 #include "config.h"
33 #if !defined(lint) && !defined(SCCSID)
34 __RCSID("$NetBSD: chartype.c,v 1.35 2019/07/23 10:18:52 christos Exp $");
35 #endif /* not lint && not SCCSID */
36
37 #include <ctype.h>
38 #include <limits.h>
39 #include <stdlib.h>
40 #include <string.h>
41
42 #include "el.h"
43
44 #define CT_BUFSIZ ((size_t)1024)
45
46 static int ct_conv_cbuff_resize(ct_buffer_t *, size_t);
47 static int ct_conv_wbuff_resize(ct_buffer_t *, size_t);
48
49 static int
ct_conv_cbuff_resize(ct_buffer_t * conv,size_t csize)50 ct_conv_cbuff_resize(ct_buffer_t *conv, size_t csize)
51 {
52 void *p;
53
54 if (csize <= conv->csize)
55 return 0;
56
57 conv->csize = csize;
58
59 p = el_realloc(conv->cbuff, conv->csize * sizeof(*conv->cbuff));
60 if (p == NULL) {
61 conv->csize = 0;
62 el_free(conv->cbuff);
63 conv->cbuff = NULL;
64 return -1;
65 }
66 conv->cbuff = p;
67 return 0;
68 }
69
70 static int
ct_conv_wbuff_resize(ct_buffer_t * conv,size_t wsize)71 ct_conv_wbuff_resize(ct_buffer_t *conv, size_t wsize)
72 {
73 void *p;
74
75 if (wsize <= conv->wsize)
76 return 0;
77
78 conv->wsize = wsize;
79
80 p = el_realloc(conv->wbuff, conv->wsize * sizeof(*conv->wbuff));
81 if (p == NULL) {
82 conv->wsize = 0;
83 el_free(conv->wbuff);
84 conv->wbuff = NULL;
85 return -1;
86 }
87 conv->wbuff = p;
88 return 0;
89 }
90
91
92 char *
ct_encode_string(const wchar_t * s,ct_buffer_t * conv)93 ct_encode_string(const wchar_t *s, ct_buffer_t *conv)
94 {
95 char *dst;
96 ssize_t used;
97
98 if (!s)
99 return NULL;
100
101 dst = conv->cbuff;
102 for (;;) {
103 used = (ssize_t)(dst - conv->cbuff);
104 if ((conv->csize - (size_t)used) < 5) {
105 if (ct_conv_cbuff_resize(conv,
106 conv->csize + CT_BUFSIZ) == -1)
107 return NULL;
108 dst = conv->cbuff + used;
109 }
110 if (!*s)
111 break;
112 used = ct_encode_char(dst, (size_t)5, *s);
113 if (used == -1) /* failed to encode, need more buffer space */
114 abort();
115 ++s;
116 dst += used;
117 }
118 *dst = '\0';
119 return conv->cbuff;
120 }
121
122 wchar_t *
ct_decode_string(const char * s,ct_buffer_t * conv)123 ct_decode_string(const char *s, ct_buffer_t *conv)
124 {
125 size_t len;
126
127 if (!s)
128 return NULL;
129
130 len = mbstowcs(NULL, s, (size_t)0);
131 if (len == (size_t)-1)
132 return NULL;
133
134 if (conv->wsize < ++len)
135 if (ct_conv_wbuff_resize(conv, len + CT_BUFSIZ) == -1)
136 return NULL;
137
138 mbstowcs(conv->wbuff, s, conv->wsize);
139 return conv->wbuff;
140 }
141
142
143 libedit_private wchar_t **
ct_decode_argv(int argc,const char * argv[],ct_buffer_t * conv)144 ct_decode_argv(int argc, const char *argv[], ct_buffer_t *conv)
145 {
146 size_t bufspace;
147 int i;
148 wchar_t *p;
149 wchar_t **wargv;
150 ssize_t bytes;
151
152 /* Make sure we have enough space in the conversion buffer to store all
153 * the argv strings. */
154 for (i = 0, bufspace = 0; i < argc; ++i)
155 bufspace += argv[i] ? strlen(argv[i]) + 1 : 0;
156 if (conv->wsize < ++bufspace)
157 if (ct_conv_wbuff_resize(conv, bufspace + CT_BUFSIZ) == -1)
158 return NULL;
159
160 wargv = el_calloc((size_t)(argc + 1), sizeof(*wargv));
161
162 for (i = 0, p = conv->wbuff; i < argc; ++i) {
163 if (!argv[i]) { /* don't pass null pointers to mbstowcs */
164 wargv[i] = NULL;
165 continue;
166 } else {
167 wargv[i] = p;
168 bytes = (ssize_t)mbstowcs(p, argv[i], bufspace);
169 }
170 if (bytes == -1) {
171 el_free(wargv);
172 return NULL;
173 } else
174 bytes++; /* include '\0' in the count */
175 bufspace -= (size_t)bytes;
176 p += bytes;
177 }
178 wargv[i] = NULL;
179
180 return wargv;
181 }
182
183
184 libedit_private size_t
ct_enc_width(wchar_t c)185 ct_enc_width(wchar_t c)
186 {
187 mbstate_t mbs;
188 char buf[MB_LEN_MAX];
189 size_t size;
190 memset(&mbs, 0, sizeof(mbs));
191
192 if ((size = wcrtomb(buf, c, &mbs)) == (size_t)-1)
193 return 0;
194 return size;
195 }
196
197 libedit_private ssize_t
ct_encode_char(char * dst,size_t len,wchar_t c)198 ct_encode_char(char *dst, size_t len, wchar_t c)
199 {
200 ssize_t l = 0;
201 if (len < ct_enc_width(c))
202 return -1;
203 l = wctomb(dst, c);
204
205 if (l < 0) {
206 wctomb(NULL, L'\0');
207 l = 0;
208 }
209 return l;
210 }
211
212 libedit_private const wchar_t *
ct_visual_string(const wchar_t * s,ct_buffer_t * conv)213 ct_visual_string(const wchar_t *s, ct_buffer_t *conv)
214 {
215 wchar_t *dst;
216 ssize_t used;
217
218 if (!s)
219 return NULL;
220
221 if (ct_conv_wbuff_resize(conv, CT_BUFSIZ) == -1)
222 return NULL;
223
224 used = 0;
225 dst = conv->wbuff;
226 while (*s) {
227 used = ct_visual_char(dst,
228 conv->wsize - (size_t)(dst - conv->wbuff), *s);
229 if (used != -1) {
230 ++s;
231 dst += used;
232 continue;
233 }
234
235 /* failed to encode, need more buffer space */
236 used = dst - conv->wbuff;
237 if (ct_conv_wbuff_resize(conv, conv->wsize + CT_BUFSIZ) == -1)
238 return NULL;
239 dst = conv->wbuff + used;
240 }
241
242 if (dst >= (conv->wbuff + conv->wsize)) { /* sigh */
243 used = dst - conv->wbuff;
244 if (ct_conv_wbuff_resize(conv, conv->wsize + CT_BUFSIZ) == -1)
245 return NULL;
246 dst = conv->wbuff + used;
247 }
248
249 *dst = L'\0';
250 return conv->wbuff;
251 }
252
253
254
255 libedit_private int
ct_visual_width(wchar_t c)256 ct_visual_width(wchar_t c)
257 {
258 int t = ct_chr_class(c);
259 switch (t) {
260 case CHTYPE_ASCIICTL:
261 return 2; /* ^@ ^? etc. */
262 case CHTYPE_TAB:
263 return 1; /* Hmm, this really need to be handled outside! */
264 case CHTYPE_NL:
265 return 0; /* Should this be 1 instead? */
266 case CHTYPE_PRINT:
267 return wcwidth(c);
268 case CHTYPE_NONPRINT:
269 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
270 return 8; /* \U+12345 */
271 else
272 return 7; /* \U+1234 */
273 default:
274 return 0; /* should not happen */
275 }
276 }
277
278
279 libedit_private ssize_t
ct_visual_char(wchar_t * dst,size_t len,wchar_t c)280 ct_visual_char(wchar_t *dst, size_t len, wchar_t c)
281 {
282 int t = ct_chr_class(c);
283 switch (t) {
284 case CHTYPE_TAB:
285 case CHTYPE_NL:
286 case CHTYPE_ASCIICTL:
287 if (len < 2)
288 return -1; /* insufficient space */
289 *dst++ = '^';
290 if (c == '\177')
291 *dst = '?'; /* DEL -> ^? */
292 else
293 *dst = c | 0100; /* uncontrolify it */
294 return 2;
295 case CHTYPE_PRINT:
296 if (len < 1)
297 return -1; /* insufficient space */
298 *dst = c;
299 return 1;
300 case CHTYPE_NONPRINT:
301 /* we only use single-width glyphs for display,
302 * so this is right */
303 if ((ssize_t)len < ct_visual_width(c))
304 return -1; /* insufficient space */
305 *dst++ = '\\';
306 *dst++ = 'U';
307 *dst++ = '+';
308 #define tohexdigit(v) "0123456789ABCDEF"[v]
309 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
310 *dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf);
311 *dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf);
312 *dst++ = tohexdigit(((unsigned int) c >> 8) & 0xf);
313 *dst++ = tohexdigit(((unsigned int) c >> 4) & 0xf);
314 *dst = tohexdigit(((unsigned int) c ) & 0xf);
315 return c > 0xffff ? 8 : 7;
316 /*FALLTHROUGH*/
317 /* these two should be handled outside this function */
318 default: /* we should never hit the default */
319 return 0;
320 }
321 }
322
323
324
325
326 libedit_private int
ct_chr_class(wchar_t c)327 ct_chr_class(wchar_t c)
328 {
329 if (c == '\t')
330 return CHTYPE_TAB;
331 else if (c == '\n')
332 return CHTYPE_NL;
333 else if (c < 0x100 && iswcntrl(c))
334 return CHTYPE_ASCIICTL;
335 else if (iswprint(c))
336 return CHTYPE_PRINT;
337 else
338 return CHTYPE_NONPRINT;
339 }
340