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chartype.c revision 1.13 
      1 /*	$NetBSD: chartype.c,v 1.13 2016/02/11 19:21:04 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 1.13 2016/02/11 19:21:04 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
     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
     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 *
     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 *
    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 **
    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
    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
    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 *
    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
    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
    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) (Char)((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
    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