1 /* $NetBSD: chartype.c,v 1.12 2015/02/22 02:16:19 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 1.12 2015/02/22 02:16:19 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) ((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