1 /* $NetBSD: chartype.c,v 1.12 2015/02/22 02:16:19 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 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the NetBSD
18 * Foundation, Inc. and its contributors.
19 * 4. Neither the name of The NetBSD Foundation nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 /*
37 * chartype.c: character classification and meta information
38 */
39 #include "config.h"
40 #if !defined(lint) && !defined(SCCSID)
41 __RCSID("$NetBSD: chartype.c,v 1.12 2015/02/22 02:16:19 christos Exp $");
42 #endif /* not lint && not SCCSID */
43 #include "el.h"
44 #include <stdlib.h>
45
46 #define CT_BUFSIZ ((size_t)1024)
47
48 #ifdef WIDECHAR
49 protected 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 protected 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 public char *
ct_encode_string(const Char * s,ct_buffer_t * conv)93 ct_encode_string(const Char *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 public Char *
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 = ct_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 ct_mbstowcs(conv->wbuff, s, conv->wsize);
139 return conv->wbuff;
140 }
141
142
143 protected Char **
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 Char *p;
149 Char **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_malloc((size_t)argc * 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
179 return wargv;
180 }
181
182
183 protected size_t
ct_enc_width(Char c)184 ct_enc_width(Char c)
185 {
186 /* UTF-8 encoding specific values */
187 if (c < 0x80)
188 return 1;
189 else if (c < 0x0800)
190 return 2;
191 else if (c < 0x10000)
192 return 3;
193 else if (c < 0x110000)
194 return 4;
195 else
196 return 0; /* not a valid codepoint */
197 }
198
199 protected ssize_t
ct_encode_char(char * dst,size_t len,Char c)200 ct_encode_char(char *dst, size_t len, Char c)
201 {
202 ssize_t l = 0;
203 if (len < ct_enc_width(c))
204 return -1;
205 l = ct_wctomb(dst, c);
206
207 if (l < 0) {
208 ct_wctomb_reset;
209 l = 0;
210 }
211 return l;
212 }
213 #endif
214
215 protected const Char *
ct_visual_string(const Char * s)216 ct_visual_string(const Char *s)
217 {
218 static Char *buff = NULL;
219 static size_t buffsize = 0;
220 void *p;
221 Char *dst;
222 ssize_t used = 0;
223
224 if (!s)
225 return NULL;
226 if (!buff) {
227 buffsize = CT_BUFSIZ;
228 buff = el_malloc(buffsize * sizeof(*buff));
229 }
230 dst = buff;
231 while (*s) {
232 used = ct_visual_char(dst, buffsize - (size_t)(dst - buff), *s);
233 if (used == -1) { /* failed to encode, need more buffer space */
234 used = dst - buff;
235 buffsize += CT_BUFSIZ;
236 p = el_realloc(buff, buffsize * sizeof(*buff));
237 if (p == NULL)
238 goto out;
239 buff = p;
240 dst = buff + used;
241 /* don't increment s here - we want to retry it! */
242 }
243 else
244 ++s;
245 dst += used;
246 }
247 if (dst >= (buff + buffsize)) { /* sigh */
248 buffsize += 1;
249 p = el_realloc(buff, buffsize * sizeof(*buff));
250 if (p == NULL)
251 goto out;
252 buff = p;
253 dst = buff + buffsize - 1;
254 }
255 *dst = 0;
256 return buff;
257 out:
258 el_free(buff);
259 buffsize = 0;
260 return NULL;
261 }
262
263
264
265 protected int
ct_visual_width(Char c)266 ct_visual_width(Char c)
267 {
268 int t = ct_chr_class(c);
269 switch (t) {
270 case CHTYPE_ASCIICTL:
271 return 2; /* ^@ ^? etc. */
272 case CHTYPE_TAB:
273 return 1; /* Hmm, this really need to be handled outside! */
274 case CHTYPE_NL:
275 return 0; /* Should this be 1 instead? */
276 #ifdef WIDECHAR
277 case CHTYPE_PRINT:
278 return wcwidth(c);
279 case CHTYPE_NONPRINT:
280 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
281 return 8; /* \U+12345 */
282 else
283 return 7; /* \U+1234 */
284 #else
285 case CHTYPE_PRINT:
286 return 1;
287 case CHTYPE_NONPRINT:
288 return 4; /* \123 */
289 #endif
290 default:
291 return 0; /* should not happen */
292 }
293 }
294
295
296 protected ssize_t
ct_visual_char(Char * dst,size_t len,Char c)297 ct_visual_char(Char *dst, size_t len, Char c)
298 {
299 int t = ct_chr_class(c);
300 switch (t) {
301 case CHTYPE_TAB:
302 case CHTYPE_NL:
303 case CHTYPE_ASCIICTL:
304 if (len < 2)
305 return -1; /* insufficient space */
306 *dst++ = '^';
307 if (c == '\177')
308 *dst = '?'; /* DEL -> ^? */
309 else
310 *dst = c | 0100; /* uncontrolify it */
311 return 2;
312 case CHTYPE_PRINT:
313 if (len < 1)
314 return -1; /* insufficient space */
315 *dst = c;
316 return 1;
317 case CHTYPE_NONPRINT:
318 /* we only use single-width glyphs for display,
319 * so this is right */
320 if ((ssize_t)len < ct_visual_width(c))
321 return -1; /* insufficient space */
322 #ifdef WIDECHAR
323 *dst++ = '\\';
324 *dst++ = 'U';
325 *dst++ = '+';
326 #define tohexdigit(v) "0123456789ABCDEF"[v]
327 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
328 *dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf);
329 *dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf);
330 *dst++ = tohexdigit(((unsigned int) c >> 8) & 0xf);
331 *dst++ = tohexdigit(((unsigned int) c >> 4) & 0xf);
332 *dst = tohexdigit(((unsigned int) c ) & 0xf);
333 return c > 0xffff ? 8 : 7;
334 #else
335 *dst++ = '\\';
336 #define tooctaldigit(v) ((v) + '0')
337 *dst++ = tooctaldigit(((unsigned int) c >> 6) & 0x7);
338 *dst++ = tooctaldigit(((unsigned int) c >> 3) & 0x7);
339 *dst++ = tooctaldigit(((unsigned int) c ) & 0x7);
340 #endif
341 /*FALLTHROUGH*/
342 /* these two should be handled outside this function */
343 default: /* we should never hit the default */
344 return 0;
345 }
346 }
347
348
349
350
351 protected int
ct_chr_class(Char c)352 ct_chr_class(Char c)
353 {
354 if (c == '\t')
355 return CHTYPE_TAB;
356 else if (c == '\n')
357 return CHTYPE_NL;
358 else if (IsASCII(c) && Iscntrl(c))
359 return CHTYPE_ASCIICTL;
360 else if (Isprint(c))
361 return CHTYPE_PRINT;
362 else
363 return CHTYPE_NONPRINT;
364 }
365