1 /* $NetBSD: chartype.c,v 1.37 2023/08/10 20:38:00 mrg 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 1.37 2023/08/10 20:38:00 mrg 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 #include <stdint.h>
42
43 #include "el.h"
44
45 #define CT_BUFSIZ ((size_t)1024)
46
47 static int ct_conv_cbuff_resize(ct_buffer_t *, size_t);
48 static int ct_conv_wbuff_resize(ct_buffer_t *, size_t);
49
50 static int
ct_conv_cbuff_resize(ct_buffer_t * conv,size_t csize)51 ct_conv_cbuff_resize(ct_buffer_t *conv, size_t csize)
52 {
53 void *p;
54
55 if (csize <= conv->csize)
56 return 0;
57
58 conv->csize = csize;
59
60 p = el_realloc(conv->cbuff, conv->csize * sizeof(*conv->cbuff));
61 if (p == NULL) {
62 conv->csize = 0;
63 el_free(conv->cbuff);
64 conv->cbuff = NULL;
65 return -1;
66 }
67 conv->cbuff = p;
68 return 0;
69 }
70
71 static int
ct_conv_wbuff_resize(ct_buffer_t * conv,size_t wsize)72 ct_conv_wbuff_resize(ct_buffer_t *conv, size_t wsize)
73 {
74 void *p;
75
76 if (wsize <= conv->wsize)
77 return 0;
78
79 conv->wsize = wsize;
80
81 p = el_realloc(conv->wbuff, conv->wsize * sizeof(*conv->wbuff));
82 if (p == NULL) {
83 conv->wsize = 0;
84 el_free(conv->wbuff);
85 conv->wbuff = NULL;
86 return -1;
87 }
88 conv->wbuff = p;
89 return 0;
90 }
91
92
93 char *
ct_encode_string(const wchar_t * s,ct_buffer_t * conv)94 ct_encode_string(const wchar_t *s, ct_buffer_t *conv)
95 {
96 char *dst;
97 ssize_t used;
98
99 if (!s)
100 return NULL;
101
102 dst = conv->cbuff;
103 for (;;) {
104 used = (ssize_t)(dst - conv->cbuff);
105 if ((conv->csize - (size_t)used) < 5) {
106 if (ct_conv_cbuff_resize(conv,
107 conv->csize + CT_BUFSIZ) == -1)
108 return NULL;
109 dst = conv->cbuff + used;
110 }
111 if (!*s)
112 break;
113 used = ct_encode_char(dst, (size_t)5, *s);
114 if (used == -1) /* failed to encode, need more buffer space */
115 abort();
116 ++s;
117 dst += used;
118 }
119 *dst = '\0';
120 return conv->cbuff;
121 }
122
123 wchar_t *
ct_decode_string(const char * s,ct_buffer_t * conv)124 ct_decode_string(const char *s, ct_buffer_t *conv)
125 {
126 size_t len;
127
128 if (!s)
129 return NULL;
130
131 len = mbstowcs(NULL, s, (size_t)0);
132 if (len == (size_t)-1)
133 return NULL;
134
135 if (conv->wsize < ++len)
136 if (ct_conv_wbuff_resize(conv, len + CT_BUFSIZ) == -1)
137 return NULL;
138
139 mbstowcs(conv->wbuff, s, conv->wsize);
140 return conv->wbuff;
141 }
142
143
144 libedit_private wchar_t **
ct_decode_argv(int argc,const char * argv[],ct_buffer_t * conv)145 ct_decode_argv(int argc, const char *argv[], ct_buffer_t *conv)
146 {
147 size_t bufspace;
148 int i;
149 wchar_t *p;
150 wchar_t **wargv;
151 ssize_t bytes;
152
153 /* Make sure we have enough space in the conversion buffer to store all
154 * the argv strings. */
155 for (i = 0, bufspace = 0; i < argc; ++i)
156 bufspace += argv[i] ? strlen(argv[i]) + 1 : 0;
157 if (conv->wsize < ++bufspace)
158 if (ct_conv_wbuff_resize(conv, bufspace + CT_BUFSIZ) == -1)
159 return NULL;
160
161 wargv = el_calloc((size_t)(argc + 1), sizeof(*wargv));
162 if (wargv == NULL)
163 return NULL;
164
165 for (i = 0, p = conv->wbuff; i < argc; ++i) {
166 if (!argv[i]) { /* don't pass null pointers to mbstowcs */
167 wargv[i] = NULL;
168 continue;
169 } else {
170 wargv[i] = p;
171 bytes = (ssize_t)mbstowcs(p, argv[i], bufspace);
172 }
173 if (bytes == -1) {
174 el_free(wargv);
175 return NULL;
176 } else
177 bytes++; /* include '\0' in the count */
178 bufspace -= (size_t)bytes;
179 p += bytes;
180 }
181 wargv[i] = NULL;
182
183 return wargv;
184 }
185
186
187 libedit_private size_t
ct_enc_width(wchar_t c)188 ct_enc_width(wchar_t c)
189 {
190 mbstate_t mbs;
191 char buf[MB_LEN_MAX];
192 size_t size;
193 memset(&mbs, 0, sizeof(mbs));
194
195 if ((size = wcrtomb(buf, c, &mbs)) == (size_t)-1)
196 return 0;
197 return size;
198 }
199
200 libedit_private ssize_t
ct_encode_char(char * dst,size_t len,wchar_t c)201 ct_encode_char(char *dst, size_t len, wchar_t c)
202 {
203 ssize_t l = 0;
204 if (len < ct_enc_width(c))
205 return -1;
206 l = wctomb(dst, c);
207
208 if (l < 0) {
209 wctomb(NULL, L'\0');
210 l = 0;
211 }
212 return l;
213 }
214
215 libedit_private const wchar_t *
ct_visual_string(const wchar_t * s,ct_buffer_t * conv)216 ct_visual_string(const wchar_t *s, ct_buffer_t *conv)
217 {
218 wchar_t *dst;
219 ssize_t used;
220
221 if (!s)
222 return NULL;
223
224 if (ct_conv_wbuff_resize(conv, CT_BUFSIZ) == -1)
225 return NULL;
226
227 used = 0;
228 dst = conv->wbuff;
229 while (*s) {
230 used = ct_visual_char(dst,
231 conv->wsize - (size_t)(dst - conv->wbuff), *s);
232 if (used != -1) {
233 ++s;
234 dst += used;
235 continue;
236 }
237
238 /* failed to encode, need more buffer space */
239 uintptr_t sused = (uintptr_t)dst - (uintptr_t)conv->wbuff;
240 if (ct_conv_wbuff_resize(conv, conv->wsize + CT_BUFSIZ) == -1)
241 return NULL;
242 dst = conv->wbuff + sused;
243 }
244
245 if (dst >= (conv->wbuff + conv->wsize)) { /* sigh */
246 uintptr_t sused = (uintptr_t)dst - (uintptr_t)conv->wbuff;
247 if (ct_conv_wbuff_resize(conv, conv->wsize + CT_BUFSIZ) == -1)
248 return NULL;
249 dst = conv->wbuff + sused;
250 }
251
252 *dst = L'\0';
253 return conv->wbuff;
254 }
255
256
257
258 libedit_private int
ct_visual_width(wchar_t c)259 ct_visual_width(wchar_t c)
260 {
261 int t = ct_chr_class(c);
262 switch (t) {
263 case CHTYPE_ASCIICTL:
264 return 2; /* ^@ ^? etc. */
265 case CHTYPE_TAB:
266 return 1; /* Hmm, this really need to be handled outside! */
267 case CHTYPE_NL:
268 return 0; /* Should this be 1 instead? */
269 case CHTYPE_PRINT:
270 return wcwidth(c);
271 case CHTYPE_NONPRINT:
272 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
273 return 8; /* \U+12345 */
274 else
275 return 7; /* \U+1234 */
276 default:
277 return 0; /* should not happen */
278 }
279 }
280
281
282 libedit_private ssize_t
ct_visual_char(wchar_t * dst,size_t len,wchar_t c)283 ct_visual_char(wchar_t *dst, size_t len, wchar_t c)
284 {
285 int t = ct_chr_class(c);
286 switch (t) {
287 case CHTYPE_TAB:
288 case CHTYPE_NL:
289 case CHTYPE_ASCIICTL:
290 if (len < 2)
291 return -1; /* insufficient space */
292 *dst++ = '^';
293 if (c == '\177')
294 *dst = '?'; /* DEL -> ^? */
295 else
296 *dst = c | 0100; /* uncontrolify it */
297 return 2;
298 case CHTYPE_PRINT:
299 if (len < 1)
300 return -1; /* insufficient space */
301 *dst = c;
302 return 1;
303 case CHTYPE_NONPRINT:
304 /* we only use single-width glyphs for display,
305 * so this is right */
306 if ((ssize_t)len < ct_visual_width(c))
307 return -1; /* insufficient space */
308 *dst++ = '\\';
309 *dst++ = 'U';
310 *dst++ = '+';
311 #define tohexdigit(v) "0123456789ABCDEF"[v]
312 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
313 *dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf);
314 *dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf);
315 *dst++ = tohexdigit(((unsigned int) c >> 8) & 0xf);
316 *dst++ = tohexdigit(((unsigned int) c >> 4) & 0xf);
317 *dst = tohexdigit(((unsigned int) c ) & 0xf);
318 return c > 0xffff ? 8 : 7;
319 /*FALLTHROUGH*/
320 /* these two should be handled outside this function */
321 default: /* we should never hit the default */
322 return 0;
323 }
324 }
325
326
327
328
329 libedit_private int
ct_chr_class(wchar_t c)330 ct_chr_class(wchar_t c)
331 {
332 if (c == '\t')
333 return CHTYPE_TAB;
334 else if (c == '\n')
335 return CHTYPE_NL;
336 else if (c < 0x100 && iswcntrl(c))
337 return CHTYPE_ASCIICTL;
338 else if (iswprint(c))
339 return CHTYPE_PRINT;
340 else
341 return CHTYPE_NONPRINT;
342 }
343