1/*	$NetBSD: chartype.c,v 1.9 2011/07/29 23:44:44 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 1.9 2011/07/29 23:44:44 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
49protected void
50ct_conv_buff_resize(ct_buffer_t *conv, size_t mincsize, size_t minwsize)
51{
52	void *p;
53	if (mincsize > conv->csize) {
54		conv->csize = mincsize;
55		p = el_realloc(conv->cbuff, conv->csize * sizeof(*conv->cbuff));
56		if (p == NULL) {
57			conv->csize = 0;
58			el_free(conv->cbuff);
59			conv->cbuff = NULL;
60		} else
61			conv->cbuff = p;
62	}
63
64	if (minwsize > conv->wsize) {
65		conv->wsize = minwsize;
66		p = el_realloc(conv->wbuff, conv->wsize * sizeof(*conv->wbuff));
67		if (p == NULL) {
68			conv->wsize = 0;
69			el_free(conv->wbuff);
70			conv->wbuff = NULL;
71		} else
72			conv->wbuff = p;
73	}
74}
75
76
77public char *
78ct_encode_string(const Char *s, ct_buffer_t *conv)
79{
80	char *dst;
81	ssize_t used = 0;
82
83	if (!s)
84		return NULL;
85	if (!conv->cbuff)
86		ct_conv_buff_resize(conv, CT_BUFSIZ, (size_t)0);
87	if (!conv->cbuff)
88		return NULL;
89
90	dst = conv->cbuff;
91	while (*s) {
92		used = (ssize_t)(conv->csize - (size_t)(dst - conv->cbuff));
93		if (used < 5) {
94			used = dst - conv->cbuff;
95			ct_conv_buff_resize(conv, conv->csize + CT_BUFSIZ,
96			    (size_t)0);
97			if (!conv->cbuff)
98				return NULL;
99			dst = conv->cbuff + used;
100		}
101		used = ct_encode_char(dst, (size_t)5, *s);
102		if (used == -1) /* failed to encode, need more buffer space */
103			abort();
104		++s;
105		dst += used;
106	}
107	*dst = '\0';
108	return conv->cbuff;
109}
110
111public Char *
112ct_decode_string(const char *s, ct_buffer_t *conv)
113{
114	size_t len = 0;
115
116	if (!s)
117		return NULL;
118	if (!conv->wbuff)
119		ct_conv_buff_resize(conv, (size_t)0, CT_BUFSIZ);
120	if (!conv->wbuff)
121		return NULL;
122
123	len = ct_mbstowcs(NULL, s, (size_t)0);
124	if (len == (size_t)-1)
125		return NULL;
126	if (len > conv->wsize)
127		ct_conv_buff_resize(conv, (size_t)0, len + 1);
128	if (!conv->wbuff)
129		return NULL;
130	ct_mbstowcs(conv->wbuff, s, conv->wsize);
131	return conv->wbuff;
132}
133
134
135protected Char **
136ct_decode_argv(int argc, const char *argv[], ct_buffer_t *conv)
137{
138	size_t bufspace;
139	int i;
140	Char *p;
141	Char **wargv;
142	ssize_t bytes;
143
144	/* Make sure we have enough space in the conversion buffer to store all
145	 * the argv strings. */
146	for (i = 0, bufspace = 0; i < argc; ++i)
147		bufspace += argv[i] ? strlen(argv[i]) + 1 : 0;
148	ct_conv_buff_resize(conv, (size_t)0, bufspace);
149	if (!conv->wsize)
150		return NULL;
151
152	wargv = el_malloc((size_t)argc * sizeof(*wargv));
153
154	for (i = 0, p = conv->wbuff; i < argc; ++i) {
155		if (!argv[i]) {   /* don't pass null pointers to mbstowcs */
156			wargv[i] = NULL;
157			continue;
158		} else {
159			wargv[i] = p;
160			bytes = (ssize_t)mbstowcs(p, argv[i], bufspace);
161		}
162		if (bytes == -1) {
163			el_free(wargv);
164			return NULL;
165		} else
166			bytes++;  /* include '\0' in the count */
167		bufspace -= (size_t)bytes;
168		p += bytes;
169	}
170
171	return wargv;
172}
173
174
175protected size_t
176ct_enc_width(Char c)
177{
178	/* UTF-8 encoding specific values */
179	if (c < 0x80)
180		return 1;
181	else if (c < 0x0800)
182		return 2;
183	else if (c < 0x10000)
184		return 3;
185	else if (c < 0x110000)
186		return 4;
187	else
188		return 0; /* not a valid codepoint */
189}
190
191protected ssize_t
192ct_encode_char(char *dst, size_t len, Char c)
193{
194	ssize_t l = 0;
195	if (len < ct_enc_width(c))
196		return -1;
197	l = ct_wctomb(dst, c);
198
199	if (l < 0) {
200		ct_wctomb_reset;
201		l = 0;
202	}
203	return l;
204}
205#endif
206
207protected const Char *
208ct_visual_string(const Char *s)
209{
210	static Char *buff = NULL;
211	static size_t buffsize = 0;
212	void *p;
213	Char *dst;
214	ssize_t used = 0;
215
216	if (!s)
217		return NULL;
218	if (!buff) {
219	    buffsize = CT_BUFSIZ;
220	    buff = el_malloc(buffsize * sizeof(*buff));
221	}
222	dst = buff;
223	while (*s) {
224		used = ct_visual_char(dst, buffsize - (size_t)(dst - buff), *s);
225		if (used == -1) { /* failed to encode, need more buffer space */
226			used = dst - buff;
227			buffsize += CT_BUFSIZ;
228			p = el_realloc(buff, buffsize * sizeof(*buff));
229			if (p == NULL)
230				goto out;
231			buff = p;
232			dst = buff + used;
233			/* don't increment s here - we want to retry it! */
234		}
235		else
236		    ++s;
237		dst += used;
238	}
239	if (dst >= (buff + buffsize)) { /* sigh */
240		buffsize += 1;
241		p = el_realloc(buff, buffsize * sizeof(*buff));
242		if (p == NULL)
243			goto out;
244		buff = p;
245		dst = buff + buffsize - 1;
246	}
247	*dst = 0;
248	return buff;
249out:
250	el_free(buff);
251	buffsize = 0;
252	return NULL;
253}
254
255
256
257protected int
258ct_visual_width(Char 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#ifdef WIDECHAR
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#else
277	case CHTYPE_PRINT:
278		return 1;
279	case CHTYPE_NONPRINT:
280		return 4; /* \123 */
281#endif
282	default:
283		return 0; /* should not happen */
284	}
285}
286
287
288protected ssize_t
289ct_visual_char(Char *dst, size_t len, Char c)
290{
291	int t = ct_chr_class(c);
292	switch (t) {
293	case CHTYPE_TAB:
294	case CHTYPE_NL:
295	case CHTYPE_ASCIICTL:
296		if (len < 2)
297			return -1;   /* insufficient space */
298		*dst++ = '^';
299		if (c == '\177')
300			*dst = '?'; /* DEL -> ^? */
301		else
302			*dst = c | 0100;    /* uncontrolify it */
303		return 2;
304	case CHTYPE_PRINT:
305		if (len < 1)
306			return -1;  /* insufficient space */
307		*dst = c;
308		return 1;
309	case CHTYPE_NONPRINT:
310		/* we only use single-width glyphs for display,
311		 * so this is right */
312		if ((ssize_t)len < ct_visual_width(c))
313			return -1;   /* insufficient space */
314#ifdef WIDECHAR
315		*dst++ = '\\';
316		*dst++ = 'U';
317		*dst++ = '+';
318#define tohexdigit(v) "0123456789ABCDEF"[v]
319		if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
320			*dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf);
321		*dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf);
322		*dst++ = tohexdigit(((unsigned int) c >>  8) & 0xf);
323		*dst++ = tohexdigit(((unsigned int) c >>  4) & 0xf);
324		*dst   = tohexdigit(((unsigned int) c      ) & 0xf);
325		return c > 0xffff ? 8 : 7;
326#else
327		*dst++ = '\\';
328#define tooctaldigit(v) ((v) + '0')
329		*dst++ = tooctaldigit(((unsigned int) c >> 6) & 0x7);
330		*dst++ = tooctaldigit(((unsigned int) c >> 3) & 0x7);
331		*dst++ = tooctaldigit(((unsigned int) c     ) & 0x7);
332#endif
333		/*FALLTHROUGH*/
334	/* these two should be handled outside this function */
335	default:            /* we should never hit the default */
336		return 0;
337	}
338}
339
340
341
342
343protected int
344ct_chr_class(Char c)
345{
346	if (c == '\t')
347		return CHTYPE_TAB;
348	else if (c == '\n')
349		return CHTYPE_NL;
350	else if (IsASCII(c) && Iscntrl(c))
351		return CHTYPE_ASCIICTL;
352	else if (Isprint(c))
353		return CHTYPE_PRINT;
354	else
355		return CHTYPE_NONPRINT;
356}
357