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chartype.c revision 1.33 
      1 /*	$NetBSD: chartype.c,v 1.33 2018/11/18 17:15:41 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 1.33 2018/11/18 17:15:41 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 
     46 static int ct_conv_cbuff_resize(ct_buffer_t *, size_t);
     47 static int ct_conv_wbuff_resize(ct_buffer_t *, size_t);
     48 
     49 static 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 static 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 char *
     93 ct_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 
    122 wchar_t *
    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 = 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 
    143 libedit_private wchar_t **
    144 ct_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_malloc((size_t)(argc + 1) * 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 	wargv[i] = NULL;
    179 
    180 	return wargv;
    181 }
    182 
    183 
    184 libedit_private size_t
    185 ct_enc_width(wchar_t c)
    186 {
    187 	char buf[MB_LEN_MAX];
    188 	int size;
    189 	if ((size = wctomb(buf, c)) < 0)
    190 		return 0;
    191 	return (size_t)size;
    192 }
    193 
    194 libedit_private ssize_t
    195 ct_encode_char(char *dst, size_t len, wchar_t c)
    196 {
    197 	ssize_t l = 0;
    198 	if (len < ct_enc_width(c))
    199 		return -1;
    200 	l = wctomb(dst, c);
    201 
    202 	if (l < 0) {
    203 		wctomb(NULL, L'\0');
    204 		l = 0;
    205 	}
    206 	return l;
    207 }
    208 
    209 libedit_private const wchar_t *
    210 ct_visual_string(const wchar_t *s, ct_buffer_t *conv)
    211 {
    212 	wchar_t *dst;
    213 	ssize_t used;
    214 
    215 	if (!s)
    216 		return NULL;
    217 
    218 	if (ct_conv_wbuff_resize(conv, CT_BUFSIZ) == -1)
    219 		return NULL;
    220 
    221 	used = 0;
    222 	dst = conv->wbuff;
    223 	while (*s) {
    224 		used = ct_visual_char(dst,
    225 		    conv->wsize - (size_t)(dst - conv->wbuff), *s);
    226 		if (used != -1) {
    227 			++s;
    228 			dst += used;
    229 			continue;
    230 		}
    231 
    232 		/* failed to encode, need more buffer space */
    233 		used = dst - conv->wbuff;
    234 		if (ct_conv_wbuff_resize(conv, conv->wsize + CT_BUFSIZ) == -1)
    235 			return NULL;
    236 		dst = conv->wbuff + used;
    237 	}
    238 
    239 	if (dst >= (conv->wbuff + conv->wsize)) { /* sigh */
    240 		used = dst - conv->wbuff;
    241 		if (ct_conv_wbuff_resize(conv, conv->wsize + CT_BUFSIZ) == -1)
    242 			return NULL;
    243 		dst = conv->wbuff + used;
    244 	}
    245 
    246 	*dst = L'\0';
    247 	return conv->wbuff;
    248 }
    249 
    250 
    251 
    252 libedit_private int
    253 ct_visual_width(wchar_t c)
    254 {
    255 	int t = ct_chr_class(c);
    256 	switch (t) {
    257 	case CHTYPE_ASCIICTL:
    258 		return 2; /* ^@ ^? etc. */
    259 	case CHTYPE_TAB:
    260 		return 1; /* Hmm, this really need to be handled outside! */
    261 	case CHTYPE_NL:
    262 		return 0; /* Should this be 1 instead? */
    263 	case CHTYPE_PRINT:
    264 		return wcwidth(c);
    265 	case CHTYPE_NONPRINT:
    266 		if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
    267 			return 8; /* \U+12345 */
    268 		else
    269 			return 7; /* \U+1234 */
    270 	default:
    271 		return 0; /* should not happen */
    272 	}
    273 }
    274 
    275 
    276 libedit_private ssize_t
    277 ct_visual_char(wchar_t *dst, size_t len, wchar_t c)
    278 {
    279 	int t = ct_chr_class(c);
    280 	switch (t) {
    281 	case CHTYPE_TAB:
    282 	case CHTYPE_NL:
    283 	case CHTYPE_ASCIICTL:
    284 		if (len < 2)
    285 			return -1;   /* insufficient space */
    286 		*dst++ = '^';
    287 		if (c == '\177')
    288 			*dst = '?'; /* DEL -> ^? */
    289 		else
    290 			*dst = c | 0100;    /* uncontrolify it */
    291 		return 2;
    292 	case CHTYPE_PRINT:
    293 		if (len < 1)
    294 			return -1;  /* insufficient space */
    295 		*dst = c;
    296 		return 1;
    297 	case CHTYPE_NONPRINT:
    298 		/* we only use single-width glyphs for display,
    299 		 * so this is right */
    300 		if ((ssize_t)len < ct_visual_width(c))
    301 			return -1;   /* insufficient space */
    302 		*dst++ = '\\';
    303 		*dst++ = 'U';
    304 		*dst++ = '+';
    305 #define tohexdigit(v) "0123456789ABCDEF"[v]
    306 		if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
    307 			*dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf);
    308 		*dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf);
    309 		*dst++ = tohexdigit(((unsigned int) c >>  8) & 0xf);
    310 		*dst++ = tohexdigit(((unsigned int) c >>  4) & 0xf);
    311 		*dst   = tohexdigit(((unsigned int) c      ) & 0xf);
    312 		return c > 0xffff ? 8 : 7;
    313 		/*FALLTHROUGH*/
    314 	/* these two should be handled outside this function */
    315 	default:            /* we should never hit the default */
    316 		return 0;
    317 	}
    318 }
    319 
    320 
    321 
    322 
    323 libedit_private int
    324 ct_chr_class(wchar_t c)
    325 {
    326 	if (c == '\t')
    327 		return CHTYPE_TAB;
    328 	else if (c == '\n')
    329 		return CHTYPE_NL;
    330 	else if (c < 0x100 && iswcntrl(c))
    331 		return CHTYPE_ASCIICTL;
    332 	else if (iswprint(c))
    333 		return CHTYPE_PRINT;
    334 	else
    335 		return CHTYPE_NONPRINT;
    336 }
    337