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chartype.c revision 1.15 
      1 /*	$NetBSD: chartype.c,v 1.15 2016/02/16 14:06:05 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 1.15 2016/02/16 14:06:05 christos Exp $");
     42 #endif /* not lint && not SCCSID */
     43 
     44 #include "histedit.h"
     45 #include "el.h"
     46 #include <stdlib.h>
     47 
     48 #define CT_BUFSIZ ((size_t)1024)
     49 
     50 #ifdef WIDECHAR
     51 protected int
     52 ct_conv_cbuff_resize(ct_buffer_t *conv, size_t csize)
     53 {
     54 	void *p;
     55 
     56 	if (csize <= conv->csize)
     57 		return 0;
     58 
     59 	conv->csize = csize;
     60 
     61 	p = el_realloc(conv->cbuff, conv->csize * sizeof(*conv->cbuff));
     62 	if (p == NULL) {
     63 		conv->csize = 0;
     64 		el_free(conv->cbuff);
     65 		conv->cbuff = NULL;
     66 		return -1;
     67 	}
     68 	conv->cbuff = p;
     69 	return 0;
     70 }
     71 
     72 protected int
     73 ct_conv_wbuff_resize(ct_buffer_t *conv, size_t wsize)
     74 {
     75 	void *p;
     76 
     77 	if (wsize <= conv->wsize)
     78 		return 0;
     79 
     80 	conv->wsize = wsize;
     81 
     82 	p = el_realloc(conv->wbuff, conv->wsize * sizeof(*conv->wbuff));
     83 	if (p == NULL) {
     84 		conv->wsize = 0;
     85 		el_free(conv->wbuff);
     86 		conv->wbuff = NULL;
     87 		return -1;
     88 	}
     89 	conv->wbuff = p;
     90 	return 0;
     91 }
     92 
     93 
     94 public char *
     95 ct_encode_string(const Char *s, ct_buffer_t *conv)
     96 {
     97 	char *dst;
     98 	ssize_t used;
     99 
    100 	if (!s)
    101 		return NULL;
    102 
    103 	dst = conv->cbuff;
    104 	for (;;) {
    105 		used = (ssize_t)(dst - conv->cbuff);
    106 		if ((conv->csize - (size_t)used) < 5) {
    107 			if (ct_conv_cbuff_resize(conv,
    108 			    conv->csize + CT_BUFSIZ) == -1)
    109 				return NULL;
    110 			dst = conv->cbuff + used;
    111 		}
    112 		if (!*s)
    113 			break;
    114 		used = ct_encode_char(dst, (size_t)5, *s);
    115 		if (used == -1) /* failed to encode, need more buffer space */
    116 			abort();
    117 		++s;
    118 		dst += used;
    119 	}
    120 	*dst = '\0';
    121 	return conv->cbuff;
    122 }
    123 
    124 public Char *
    125 ct_decode_string(const char *s, ct_buffer_t *conv)
    126 {
    127 	size_t len;
    128 
    129 	if (!s)
    130 		return NULL;
    131 
    132 	len = ct_mbstowcs(NULL, s, (size_t)0);
    133 	if (len == (size_t)-1)
    134 		return NULL;
    135 
    136 	if (conv->wsize < ++len)
    137 		if (ct_conv_wbuff_resize(conv, len + CT_BUFSIZ) == -1)
    138 			return NULL;
    139 
    140 	ct_mbstowcs(conv->wbuff, s, conv->wsize);
    141 	return conv->wbuff;
    142 }
    143 
    144 
    145 protected Char **
    146 ct_decode_argv(int argc, const char *argv[], ct_buffer_t *conv)
    147 {
    148 	size_t bufspace;
    149 	int i;
    150 	Char *p;
    151 	Char **wargv;
    152 	ssize_t bytes;
    153 
    154 	/* Make sure we have enough space in the conversion buffer to store all
    155 	 * the argv strings. */
    156 	for (i = 0, bufspace = 0; i < argc; ++i)
    157 		bufspace += argv[i] ? strlen(argv[i]) + 1 : 0;
    158 	if (conv->wsize < ++bufspace)
    159 		if (ct_conv_wbuff_resize(conv, bufspace + CT_BUFSIZ) == -1)
    160 			return NULL;
    161 
    162 	wargv = el_malloc((size_t)argc * sizeof(*wargv));
    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 
    181 	return wargv;
    182 }
    183 
    184 
    185 protected size_t
    186 ct_enc_width(Char c)
    187 {
    188 	/* UTF-8 encoding specific values */
    189 	if (c < 0x80)
    190 		return 1;
    191 	else if (c < 0x0800)
    192 		return 2;
    193 	else if (c < 0x10000)
    194 		return 3;
    195 	else if (c < 0x110000)
    196 		return 4;
    197 	else
    198 		return 0; /* not a valid codepoint */
    199 }
    200 
    201 protected ssize_t
    202 ct_encode_char(char *dst, size_t len, Char c)
    203 {
    204 	ssize_t l = 0;
    205 	if (len < ct_enc_width(c))
    206 		return -1;
    207 	l = ct_wctomb(dst, c);
    208 
    209 	if (l < 0) {
    210 		ct_wctomb_reset;
    211 		l = 0;
    212 	}
    213 	return l;
    214 }
    215 
    216 #else
    217 
    218 size_t
    219 ct_mbrtowc(char *wc, const char *s, size_t n,
    220     void *mbs __attribute((__unused__))) {
    221 	if (s == NULL)
    222 		return 0;
    223 	if (n == 0)
    224 		return (size_t)-2;
    225 	if (wc != NULL)
    226 		*wc = *s;
    227 	return *s != '\0';
    228 }
    229 #endif
    230 
    231 protected const Char *
    232 ct_visual_string(const Char *s)
    233 {
    234 	static Char *buff = NULL;
    235 	static size_t buffsize = 0;
    236 	void *p;
    237 	Char *dst;
    238 	ssize_t used = 0;
    239 
    240 	if (!s)
    241 		return NULL;
    242 	if (!buff) {
    243 	    buffsize = CT_BUFSIZ;
    244 	    buff = el_malloc(buffsize * sizeof(*buff));
    245 	}
    246 	dst = buff;
    247 	while (*s) {
    248 		used = ct_visual_char(dst, buffsize - (size_t)(dst - buff), *s);
    249 		if (used == -1) { /* failed to encode, need more buffer space */
    250 			used = dst - buff;
    251 			buffsize += CT_BUFSIZ;
    252 			p = el_realloc(buff, buffsize * sizeof(*buff));
    253 			if (p == NULL)
    254 				goto out;
    255 			buff = p;
    256 			dst = buff + used;
    257 			/* don't increment s here - we want to retry it! */
    258 		}
    259 		else
    260 		    ++s;
    261 		dst += used;
    262 	}
    263 	if (dst >= (buff + buffsize)) { /* sigh */
    264 		buffsize += 1;
    265 		p = el_realloc(buff, buffsize * sizeof(*buff));
    266 		if (p == NULL)
    267 			goto out;
    268 		buff = p;
    269 		dst = buff + buffsize - 1;
    270 	}
    271 	*dst = 0;
    272 	return buff;
    273 out:
    274 	el_free(buff);
    275 	buffsize = 0;
    276 	return NULL;
    277 }
    278 
    279 
    280 
    281 protected int
    282 ct_visual_width(Char c)
    283 {
    284 	int t = ct_chr_class(c);
    285 	switch (t) {
    286 	case CHTYPE_ASCIICTL:
    287 		return 2; /* ^@ ^? etc. */
    288 	case CHTYPE_TAB:
    289 		return 1; /* Hmm, this really need to be handled outside! */
    290 	case CHTYPE_NL:
    291 		return 0; /* Should this be 1 instead? */
    292 #ifdef WIDECHAR
    293 	case CHTYPE_PRINT:
    294 		return wcwidth(c);
    295 	case CHTYPE_NONPRINT:
    296 		if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
    297 			return 8; /* \U+12345 */
    298 		else
    299 			return 7; /* \U+1234 */
    300 #else
    301 	case CHTYPE_PRINT:
    302 		return 1;
    303 	case CHTYPE_NONPRINT:
    304 		return 4; /* \123 */
    305 #endif
    306 	default:
    307 		return 0; /* should not happen */
    308 	}
    309 }
    310 
    311 
    312 protected ssize_t
    313 ct_visual_char(Char *dst, size_t len, Char c)
    314 {
    315 	int t = ct_chr_class(c);
    316 	switch (t) {
    317 	case CHTYPE_TAB:
    318 	case CHTYPE_NL:
    319 	case CHTYPE_ASCIICTL:
    320 		if (len < 2)
    321 			return -1;   /* insufficient space */
    322 		*dst++ = '^';
    323 		if (c == '\177')
    324 			*dst = '?'; /* DEL -> ^? */
    325 		else
    326 			*dst = c | 0100;    /* uncontrolify it */
    327 		return 2;
    328 	case CHTYPE_PRINT:
    329 		if (len < 1)
    330 			return -1;  /* insufficient space */
    331 		*dst = c;
    332 		return 1;
    333 	case CHTYPE_NONPRINT:
    334 		/* we only use single-width glyphs for display,
    335 		 * so this is right */
    336 		if ((ssize_t)len < ct_visual_width(c))
    337 			return -1;   /* insufficient space */
    338 #ifdef WIDECHAR
    339 		*dst++ = '\\';
    340 		*dst++ = 'U';
    341 		*dst++ = '+';
    342 #define tohexdigit(v) "0123456789ABCDEF"[v]
    343 		if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
    344 			*dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf);
    345 		*dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf);
    346 		*dst++ = tohexdigit(((unsigned int) c >>  8) & 0xf);
    347 		*dst++ = tohexdigit(((unsigned int) c >>  4) & 0xf);
    348 		*dst   = tohexdigit(((unsigned int) c      ) & 0xf);
    349 		return c > 0xffff ? 8 : 7;
    350 #else
    351 		*dst++ = '\\';
    352 #define tooctaldigit(v) (Char)((v) + '0')
    353 		*dst++ = tooctaldigit(((unsigned int) c >> 6) & 0x7);
    354 		*dst++ = tooctaldigit(((unsigned int) c >> 3) & 0x7);
    355 		*dst++ = tooctaldigit(((unsigned int) c     ) & 0x7);
    356 #endif
    357 		/*FALLTHROUGH*/
    358 	/* these two should be handled outside this function */
    359 	default:            /* we should never hit the default */
    360 		return 0;
    361 	}
    362 }
    363 
    364 
    365 
    366 
    367 protected int
    368 ct_chr_class(Char c)
    369 {
    370 	if (c == '\t')
    371 		return CHTYPE_TAB;
    372 	else if (c == '\n')
    373 		return CHTYPE_NL;
    374 	else if (IsASCII(c) && Iscntrl(c))
    375 		return CHTYPE_ASCIICTL;
    376 	else if (Isprint(c))
    377 		return CHTYPE_PRINT;
    378 	else
    379 		return CHTYPE_NONPRINT;
    380 }
    381