1/*	$NetBSD: chartype.c,v 1.36 2022/10/30 19:11:31 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 1.36 2022/10/30 19:11:31 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
46static int ct_conv_cbuff_resize(ct_buffer_t *, size_t);
47static int ct_conv_wbuff_resize(ct_buffer_t *, size_t);
48
49static int
50ct_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
70static int
71ct_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
92char *
93ct_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
122wchar_t *
123ct_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
143libedit_private wchar_t **
144ct_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	if (wargv == NULL)
162		return NULL;
163
164	for (i = 0, p = conv->wbuff; i < argc; ++i) {
165		if (!argv[i]) {   /* don't pass null pointers to mbstowcs */
166			wargv[i] = NULL;
167			continue;
168		} else {
169			wargv[i] = p;
170			bytes = (ssize_t)mbstowcs(p, argv[i], bufspace);
171		}
172		if (bytes == -1) {
173			el_free(wargv);
174			return NULL;
175		} else
176			bytes++;  /* include '\0' in the count */
177		bufspace -= (size_t)bytes;
178		p += bytes;
179	}
180	wargv[i] = NULL;
181
182	return wargv;
183}
184
185
186libedit_private size_t
187ct_enc_width(wchar_t c)
188{
189	mbstate_t mbs;
190	char buf[MB_LEN_MAX];
191	size_t size;
192	memset(&mbs, 0, sizeof(mbs));
193
194	if ((size = wcrtomb(buf, c, &mbs)) == (size_t)-1)
195		return 0;
196	return size;
197}
198
199libedit_private ssize_t
200ct_encode_char(char *dst, size_t len, wchar_t c)
201{
202	ssize_t l = 0;
203	if (len < ct_enc_width(c))
204		return -1;
205	l = wctomb(dst, c);
206
207	if (l < 0) {
208		wctomb(NULL, L'\0');
209		l = 0;
210	}
211	return l;
212}
213
214libedit_private const wchar_t *
215ct_visual_string(const wchar_t *s, ct_buffer_t *conv)
216{
217	wchar_t *dst;
218	ssize_t used;
219
220	if (!s)
221		return NULL;
222
223	if (ct_conv_wbuff_resize(conv, CT_BUFSIZ) == -1)
224		return NULL;
225
226	used = 0;
227	dst = conv->wbuff;
228	while (*s) {
229		used = ct_visual_char(dst,
230		    conv->wsize - (size_t)(dst - conv->wbuff), *s);
231		if (used != -1) {
232			++s;
233			dst += used;
234			continue;
235		}
236
237		/* failed to encode, need more buffer space */
238		used = dst - conv->wbuff;
239		if (ct_conv_wbuff_resize(conv, conv->wsize + CT_BUFSIZ) == -1)
240			return NULL;
241		dst = conv->wbuff + used;
242	}
243
244	if (dst >= (conv->wbuff + conv->wsize)) { /* sigh */
245		used = dst - conv->wbuff;
246		if (ct_conv_wbuff_resize(conv, conv->wsize + CT_BUFSIZ) == -1)
247			return NULL;
248		dst = conv->wbuff + used;
249	}
250
251	*dst = L'\0';
252	return conv->wbuff;
253}
254
255
256
257libedit_private int
258ct_visual_width(wchar_t c)
259{
260	int t = ct_chr_class(c);
261	switch (t) {
262	case CHTYPE_ASCIICTL:
263		return 2; /* ^@ ^? etc. */
264	case CHTYPE_TAB:
265		return 1; /* Hmm, this really need to be handled outside! */
266	case CHTYPE_NL:
267		return 0; /* Should this be 1 instead? */
268	case CHTYPE_PRINT:
269		return wcwidth(c);
270	case CHTYPE_NONPRINT:
271		if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
272			return 8; /* \U+12345 */
273		else
274			return 7; /* \U+1234 */
275	default:
276		return 0; /* should not happen */
277	}
278}
279
280
281libedit_private ssize_t
282ct_visual_char(wchar_t *dst, size_t len, wchar_t c)
283{
284	int t = ct_chr_class(c);
285	switch (t) {
286	case CHTYPE_TAB:
287	case CHTYPE_NL:
288	case CHTYPE_ASCIICTL:
289		if (len < 2)
290			return -1;   /* insufficient space */
291		*dst++ = '^';
292		if (c == '\177')
293			*dst = '?'; /* DEL -> ^? */
294		else
295			*dst = c | 0100;    /* uncontrolify it */
296		return 2;
297	case CHTYPE_PRINT:
298		if (len < 1)
299			return -1;  /* insufficient space */
300		*dst = c;
301		return 1;
302	case CHTYPE_NONPRINT:
303		/* we only use single-width glyphs for display,
304		 * so this is right */
305		if ((ssize_t)len < ct_visual_width(c))
306			return -1;   /* insufficient space */
307		*dst++ = '\\';
308		*dst++ = 'U';
309		*dst++ = '+';
310#define tohexdigit(v) "0123456789ABCDEF"[v]
311		if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
312			*dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf);
313		*dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf);
314		*dst++ = tohexdigit(((unsigned int) c >>  8) & 0xf);
315		*dst++ = tohexdigit(((unsigned int) c >>  4) & 0xf);
316		*dst   = tohexdigit(((unsigned int) c      ) & 0xf);
317		return c > 0xffff ? 8 : 7;
318		/*FALLTHROUGH*/
319	/* these two should be handled outside this function */
320	default:            /* we should never hit the default */
321		return 0;
322	}
323}
324
325
326
327
328libedit_private int
329ct_chr_class(wchar_t c)
330{
331	if (c == '\t')
332		return CHTYPE_TAB;
333	else if (c == '\n')
334		return CHTYPE_NL;
335	else if (c < 0x100 && iswcntrl(c))
336		return CHTYPE_ASCIICTL;
337	else if (iswprint(c))
338		return CHTYPE_PRINT;
339	else
340		return CHTYPE_NONPRINT;
341}
342