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      1 /*	$NetBSD: chartype.c,v 1.37 2023/08/10 20:38:00 mrg 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 1.37 2023/08/10 20:38:00 mrg 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_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 
    186 libedit_private size_t
    187 ct_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 
    199 libedit_private ssize_t
    200 ct_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 
    214 libedit_private const wchar_t *
    215 ct_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 		uintptr_t sused = (uintptr_t)dst - (uintptr_t)conv->wbuff;
    239 		if (ct_conv_wbuff_resize(conv, conv->wsize + CT_BUFSIZ) == -1)
    240 			return NULL;
    241 		dst = conv->wbuff + sused;
    242 	}
    243 
    244 	if (dst >= (conv->wbuff + conv->wsize)) { /* sigh */
    245 		uintptr_t sused = (uintptr_t)dst - (uintptr_t)conv->wbuff;
    246 		if (ct_conv_wbuff_resize(conv, conv->wsize + CT_BUFSIZ) == -1)
    247 			return NULL;
    248 		dst = conv->wbuff + sused;
    249 	}
    250 
    251 	*dst = L'\0';
    252 	return conv->wbuff;
    253 }
    254 
    255 
    256 
    257 libedit_private int
    258 ct_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 
    281 libedit_private ssize_t
    282 ct_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 
    328 libedit_private int
    329 ct_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