1 /* $NetBSD: chartype.c,v 1.23 2016/02/28 23:02:24 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 1.23 2016/02/28 23:02:24 christos Exp $"); 35 #endif /* not lint && not SCCSID */ 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <ctype.h> 40 #include <limits.h> 41 #include <stdlib.h> 42 #include <string.h> 43 44 #include "el.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 mbstate_t ps = (mbstate_t){{0}}; 187 size_t len; 188 char cbuf[MB_LEN_MAX]; 189 len = ct_wcrtomb(cbuf, c, &ps); 190 if (len == (size_t)-1) 191 return (0); 192 return (len); 193 } 194 195 protected ssize_t 196 ct_encode_char(char *dst, size_t len, Char c) 197 { 198 ssize_t l = 0; 199 if (len < ct_enc_width(c)) 200 return -1; 201 l = ct_wctomb(dst, c); 202 203 if (l < 0) { 204 ct_wctomb_reset; 205 l = 0; 206 } 207 return l; 208 } 209 210 size_t 211 ct_mbrtowc(wchar_t *wc, const char *s, size_t n) 212 { 213 mbstate_t mbs; 214 /* This only works because UTF-8 is stateless */ 215 memset(&mbs, 0, sizeof(mbs)); 216 return mbrtowc(wc, s, n, &mbs); 217 } 218 219 #else 220 221 size_t 222 ct_mbrtowc(wchar_t *wc, const char *s, size_t n) 223 { 224 if (s == NULL) 225 return 0; 226 if (n == 0) 227 return (size_t)-2; 228 if (wc != NULL) 229 *wc = *s; 230 return *s != '\0'; 231 } 232 #endif 233 234 protected const Char * 235 ct_visual_string(const Char *s) 236 { 237 static Char *buff = NULL; 238 static size_t buffsize = 0; 239 void *p; 240 Char *dst; 241 ssize_t used = 0; 242 243 if (!s) 244 return NULL; 245 if (!buff) { 246 buffsize = CT_BUFSIZ; 247 buff = el_malloc(buffsize * sizeof(*buff)); 248 } 249 dst = buff; 250 while (*s) { 251 used = ct_visual_char(dst, buffsize - (size_t)(dst - buff), *s); 252 if (used == -1) { /* failed to encode, need more buffer space */ 253 used = dst - buff; 254 buffsize += CT_BUFSIZ; 255 p = el_realloc(buff, buffsize * sizeof(*buff)); 256 if (p == NULL) 257 goto out; 258 buff = p; 259 dst = buff + used; 260 /* don't increment s here - we want to retry it! */ 261 } 262 else 263 ++s; 264 dst += used; 265 } 266 if (dst >= (buff + buffsize)) { /* sigh */ 267 buffsize += 1; 268 p = el_realloc(buff, buffsize * sizeof(*buff)); 269 if (p == NULL) 270 goto out; 271 buff = p; 272 dst = buff + buffsize - 1; 273 } 274 *dst = 0; 275 return buff; 276 out: 277 el_free(buff); 278 buffsize = 0; 279 return NULL; 280 } 281 282 283 284 protected int 285 ct_visual_width(Char c) 286 { 287 int t = ct_chr_class(c); 288 switch (t) { 289 case CHTYPE_ASCIICTL: 290 return 2; /* ^@ ^? etc. */ 291 case CHTYPE_TAB: 292 return 1; /* Hmm, this really need to be handled outside! */ 293 case CHTYPE_NL: 294 return 0; /* Should this be 1 instead? */ 295 #ifdef WIDECHAR 296 case CHTYPE_PRINT: 297 return wcwidth(c); 298 case CHTYPE_NONPRINT: 299 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */ 300 return 8; /* \U+12345 */ 301 else 302 return 7; /* \U+1234 */ 303 #else 304 case CHTYPE_PRINT: 305 return 1; 306 case CHTYPE_NONPRINT: 307 return 4; /* \123 */ 308 #endif 309 default: 310 return 0; /* should not happen */ 311 } 312 } 313 314 315 protected ssize_t 316 ct_visual_char(Char *dst, size_t len, Char c) 317 { 318 int t = ct_chr_class(c); 319 switch (t) { 320 case CHTYPE_TAB: 321 case CHTYPE_NL: 322 case CHTYPE_ASCIICTL: 323 if (len < 2) 324 return -1; /* insufficient space */ 325 *dst++ = '^'; 326 if (c == '\177') 327 *dst = '?'; /* DEL -> ^? */ 328 else 329 *dst = c | 0100; /* uncontrolify it */ 330 return 2; 331 case CHTYPE_PRINT: 332 if (len < 1) 333 return -1; /* insufficient space */ 334 *dst = c; 335 return 1; 336 case CHTYPE_NONPRINT: 337 /* we only use single-width glyphs for display, 338 * so this is right */ 339 if ((ssize_t)len < ct_visual_width(c)) 340 return -1; /* insufficient space */ 341 #ifdef WIDECHAR 342 *dst++ = '\\'; 343 *dst++ = 'U'; 344 *dst++ = '+'; 345 #define tohexdigit(v) "0123456789ABCDEF"[v] 346 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */ 347 *dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf); 348 *dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf); 349 *dst++ = tohexdigit(((unsigned int) c >> 8) & 0xf); 350 *dst++ = tohexdigit(((unsigned int) c >> 4) & 0xf); 351 *dst = tohexdigit(((unsigned int) c ) & 0xf); 352 return c > 0xffff ? 8 : 7; 353 #else 354 *dst++ = '\\'; 355 #define tooctaldigit(v) (Char)((v) + '0') 356 *dst++ = tooctaldigit(((unsigned int) c >> 6) & 0x7); 357 *dst++ = tooctaldigit(((unsigned int) c >> 3) & 0x7); 358 *dst++ = tooctaldigit(((unsigned int) c ) & 0x7); 359 #endif 360 /*FALLTHROUGH*/ 361 /* these two should be handled outside this function */ 362 default: /* we should never hit the default */ 363 return 0; 364 } 365 } 366 367 368 369 370 protected int 371 ct_chr_class(Char c) 372 { 373 if (c == '\t') 374 return CHTYPE_TAB; 375 else if (c == '\n') 376 return CHTYPE_NL; 377 else if (IsASCII(c) && Iscntrl(c)) 378 return CHTYPE_ASCIICTL; 379 else if (Isprint(c)) 380 return CHTYPE_PRINT; 381 else 382 return CHTYPE_NONPRINT; 383 } 384