chartype.c revision 1.4
1 /* $NetBSD: chartype.c,v 1.4 2010/04/15 00:55:57 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 1.4 2010/04/15 00:55:57 christos Exp $"); 42 #endif /* not lint && not SCCSID */ 43 #include "el.h" 44 #include <stdlib.h> 45 46 #define CT_BUFSIZ 1024 47 48 #ifdef WIDECHAR 49 protected void 50 ct_conv_buff_resize(ct_buffer_t *conv, size_t mincsize, size_t minwsize) 51 { 52 void *p; 53 if (mincsize > conv->csize) { 54 conv->csize = mincsize; 55 p = el_realloc(conv->cbuff, conv->csize); 56 if (p == NULL) { 57 conv->csize = 0; 58 el_free(conv->cbuff); 59 conv->cbuff = NULL; 60 } else 61 conv->cbuff = p; 62 } 63 64 if (minwsize > conv->wsize) { 65 conv->wsize = minwsize; 66 p = el_realloc(conv->wbuff, conv->wsize); 67 if (p == NULL) { 68 conv->wsize = 0; 69 el_free(conv->wbuff); 70 conv->wbuff = NULL; 71 } else 72 conv->wbuff = p; 73 } 74 } 75 76 77 public char * 78 ct_encode_string(const Char *s, ct_buffer_t *conv) 79 { 80 char *dst; 81 ssize_t used = 0; 82 83 if (!s) 84 return NULL; 85 if (!conv->cbuff) 86 ct_conv_buff_resize(conv, CT_BUFSIZ, 0); 87 if (!conv->cbuff) 88 return NULL; 89 90 dst = conv->cbuff; 91 while (*s) { 92 used = ct_encode_char(dst, (int)(conv->csize - 93 (dst - conv->cbuff)), *s); 94 if (used == -1) { /* failed to encode, need more buffer space */ 95 used = dst - conv->cbuff; 96 ct_conv_buff_resize(conv, conv->csize + CT_BUFSIZ, 0); 97 if (!conv->cbuff) 98 return NULL; 99 dst = conv->cbuff + used; 100 /* don't increment s here - we want to retry it! */ 101 } 102 else 103 ++s; 104 dst += used; 105 } 106 if (dst >= (conv->cbuff + conv->csize)) { 107 used = dst - conv->cbuff; 108 ct_conv_buff_resize(conv, conv->csize + 1, 0); 109 if (!conv->cbuff) 110 return NULL; 111 dst = conv->cbuff + used; 112 } 113 *dst = '\0'; 114 return conv->cbuff; 115 } 116 117 public Char * 118 ct_decode_string(const char *s, ct_buffer_t *conv) 119 { 120 size_t len = 0; 121 122 if (!s) 123 return NULL; 124 if (!conv->wbuff) 125 ct_conv_buff_resize(conv, 0, CT_BUFSIZ); 126 if (!conv->wbuff) 127 return NULL; 128 129 len = ct_mbstowcs(0, s, 0); 130 if (len > conv->wsize) 131 ct_conv_buff_resize(conv, 0, len + 1); 132 if (!conv->wbuff) 133 return NULL; 134 ct_mbstowcs(conv->wbuff, s, conv->wsize); 135 return conv->wbuff; 136 } 137 138 139 protected Char ** 140 ct_decode_argv(int argc, const char *argv[], ct_buffer_t *conv) 141 { 142 size_t bufspace; 143 int i; 144 Char *p; 145 Char **wargv; 146 ssize_t bytes; 147 148 /* Make sure we have enough space in the conversion buffer to store all 149 * the argv strings. */ 150 for (i = 0, bufspace = 0; i < argc; ++i) 151 bufspace += argv[i] ? strlen(argv[i]) + 1 : 0; 152 ct_conv_buff_resize(conv, 0, bufspace); 153 if (!conv->wsize) 154 return NULL; 155 156 wargv = el_malloc(argc * sizeof(*wargv)); 157 158 for (i = 0, p = conv->wbuff; i < argc; ++i) { 159 if (!argv[i]) { /* don't pass null pointers to mbstowcs */ 160 wargv[i] = NULL; 161 continue; 162 } else { 163 wargv[i] = p; 164 bytes = mbstowcs(p, argv[i], bufspace); 165 } 166 if (bytes == -1) { 167 el_free(wargv); 168 return NULL; 169 } else 170 bytes++; /* include '\0' in the count */ 171 bufspace -= bytes; 172 p += bytes; 173 } 174 175 return wargv; 176 } 177 178 179 protected size_t 180 ct_enc_width(Char c) 181 { 182 /* UTF-8 encoding specific values */ 183 if (c < 0x80) 184 return 1; 185 else if (c < 0x0800) 186 return 2; 187 else if (c < 0x10000) 188 return 3; 189 else if (c < 0x110000) 190 return 4; 191 else 192 return 0; /* not a valid codepoint */ 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 #endif 210 211 protected const Char * 212 ct_visual_string(const Char *s) 213 { 214 static Char *buff = NULL; 215 static size_t buffsize = 0; 216 void *p; 217 Char *dst; 218 ssize_t used = 0; 219 220 if (!s) 221 return NULL; 222 if (!buff) { 223 buffsize = CT_BUFSIZ; 224 buff = el_malloc(buffsize * sizeof(*buff)); 225 } 226 dst = buff; 227 while (*s) { 228 used = ct_visual_char(dst, buffsize - (dst - buff), *s); 229 if (used == -1) { /* failed to encode, need more buffer space */ 230 used = dst - buff; 231 buffsize += CT_BUFSIZ; 232 p = el_realloc(buff, buffsize * sizeof(*buff)); 233 if (p == NULL) 234 goto out; 235 buff = p; 236 dst = buff + used; 237 /* don't increment s here - we want to retry it! */ 238 } 239 else 240 ++s; 241 dst += used; 242 } 243 if (dst >= (buff + buffsize)) { /* sigh */ 244 buffsize += 1; 245 p = el_realloc(buff, buffsize * sizeof(*buff)); 246 if (p == NULL) 247 goto out; 248 buff = p; 249 dst = buff + buffsize - 1; 250 } 251 *dst = 0; 252 return buff; 253 out: 254 el_free(buff); 255 buffsize = 0; 256 return NULL; 257 } 258 259 260 261 protected int 262 ct_visual_width(Char c) 263 { 264 int t = ct_chr_class(c); 265 switch (t) { 266 case CHTYPE_ASCIICTL: 267 return 2; /* ^@ ^? etc. */ 268 case CHTYPE_TAB: 269 return 1; /* Hmm, this really need to be handled outside! */ 270 case CHTYPE_NL: 271 return 0; /* Should this be 1 instead? */ 272 #ifdef WIDECHAR 273 case CHTYPE_PRINT: 274 return wcwidth(c); 275 case CHTYPE_NONPRINT: 276 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */ 277 return 8; /* \U+12345 */ 278 else 279 return 7; /* \U+1234 */ 280 #else 281 case CHTYPE_PRINT: 282 return 1; 283 case CHTYPE_NONPRINT: 284 return 4; /* \123 */ 285 #endif 286 default: 287 return 0; /* should not happen */ 288 } 289 } 290 291 292 protected ssize_t 293 ct_visual_char(Char *dst, size_t len, Char c) 294 { 295 int t = ct_chr_class(c); 296 switch (t) { 297 case CHTYPE_TAB: 298 case CHTYPE_NL: 299 case CHTYPE_ASCIICTL: 300 if (len < 2) 301 return -1; /* insufficient space */ 302 *dst++ = '^'; 303 if (c == '\177') 304 *dst = '?'; /* DEL -> ^? */ 305 else 306 *dst = c | 0100; /* uncontrolify it */ 307 return 2; 308 case CHTYPE_PRINT: 309 if (len < 1) 310 return -1; /* insufficient space */ 311 *dst = c; 312 return 1; 313 case CHTYPE_NONPRINT: 314 /* we only use single-width glyphs for display, 315 * so this is right */ 316 if ((ssize_t)len < ct_visual_width(c)) 317 return -1; /* insufficient space */ 318 #ifdef WIDECHAR 319 *dst++ = '\\'; 320 *dst++ = 'U'; 321 *dst++ = '+'; 322 #define tohexdigit(v) "0123456789ABCDEF"[v] 323 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */ 324 *dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf); 325 *dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf); 326 *dst++ = tohexdigit(((unsigned int) c >> 8) & 0xf); 327 *dst++ = tohexdigit(((unsigned int) c >> 4) & 0xf); 328 *dst = tohexdigit(((unsigned int) c ) & 0xf); 329 return (c > 0xffff) ? 8 : 7; 330 #else 331 *dst++ = '\\'; 332 #define tooctaldigit(v) ((v) + '0') 333 *dst++ = tooctaldigit(((unsigned int) c >> 6) & 0x7); 334 *dst++ = tooctaldigit(((unsigned int) c >> 3) & 0x7); 335 *dst++ = tooctaldigit(((unsigned int) c ) & 0x7); 336 #endif 337 /*FALLTHROUGH*/ 338 /* these two should be handled outside this function */ 339 default: /* we should never hit the default */ 340 return 0; 341 } 342 } 343 344 345 346 347 protected int 348 ct_chr_class(Char c) 349 { 350 if (c == '\t') 351 return CHTYPE_TAB; 352 else if (c == '\n') 353 return CHTYPE_NL; 354 else if (IsASCII(c) && Iscntrl(c)) 355 return CHTYPE_ASCIICTL; 356 else if (Isprint(c)) 357 return CHTYPE_PRINT; 358 else 359 return CHTYPE_NONPRINT; 360 } 361
Indexes created Sun Oct 12 02:09:55 GMT 2025