chartype.c revision 1.3
1 /* $NetBSD: chartype.c,v 1.3 2010/01/12 19:37:18 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 1.3 2010/01/12 19:37:18 christos Exp $"); 42 #endif /* not lint && not SCCSID */ 43 #include "el.h" 44 #include <stdlib.h> 45 46 #define CT_BUFSIZ 1024 47 48 49 #ifdef WIDECHAR 50 protected void 51 ct_conv_buff_resize(ct_buffer_t *conv, size_t mincsize, size_t minwsize) 52 { 53 void *p; 54 if (mincsize > conv->csize) { 55 conv->csize = mincsize; 56 p = el_realloc(conv->cbuff, conv->csize); 57 if (p == NULL) { 58 conv->csize = 0; 59 el_free(conv->cbuff); 60 conv->cbuff = NULL; 61 } else 62 conv->cbuff = p; 63 } 64 65 if (minwsize > conv->wsize) { 66 conv->wsize = minwsize; 67 p = el_realloc(conv->wbuff, conv->wsize); 68 if (p == NULL) { 69 conv->wsize = 0; 70 el_free(conv->wbuff); 71 conv->wbuff = NULL; 72 } else 73 conv->wbuff = p; 74 } 75 } 76 77 78 public char * 79 ct_encode_string(const Char *s, ct_buffer_t *conv) 80 { 81 char *dst; 82 ssize_t used = 0; 83 84 if (!s) 85 return NULL; 86 if (!conv->cbuff) 87 ct_conv_buff_resize(conv, CT_BUFSIZ, 0); 88 if (!conv->cbuff) 89 return NULL; 90 91 dst = conv->cbuff; 92 while (*s) { 93 used = ct_encode_char(dst, (int)(conv->csize - 94 (dst - conv->cbuff)), *s); 95 if (used == -1) { /* failed to encode, need more buffer space */ 96 used = dst - conv->cbuff; 97 ct_conv_buff_resize(conv, conv->csize + CT_BUFSIZ, 0); 98 if (!conv->cbuff) 99 return NULL; 100 dst = conv->cbuff + used; 101 /* don't increment s here - we want to retry it! */ 102 } 103 else 104 ++s; 105 dst += used; 106 } 107 if (dst >= (conv->cbuff + conv->csize)) { 108 used = dst - conv->cbuff; 109 ct_conv_buff_resize(conv, conv->csize + 1, 0); 110 if (!conv->cbuff) 111 return NULL; 112 dst = conv->cbuff + used; 113 } 114 *dst = '\0'; 115 return conv->cbuff; 116 } 117 118 public Char * 119 ct_decode_string(const char *s, ct_buffer_t *conv) 120 { 121 size_t len = 0; 122 123 if (!s) 124 return NULL; 125 if (!conv->wbuff) 126 ct_conv_buff_resize(conv, 0, CT_BUFSIZ); 127 if (!conv->wbuff) 128 return NULL; 129 130 len = ct_mbstowcs(0, s, 0); 131 if (len > conv->wsize) 132 ct_conv_buff_resize(conv, 0, len + 1); 133 if (!conv->wbuff) 134 return NULL; 135 ct_mbstowcs(conv->wbuff, s, conv->wsize); 136 return conv->wbuff; 137 } 138 139 140 protected Char ** 141 ct_decode_argv(int argc, const char *argv[], ct_buffer_t *conv) 142 { 143 size_t bufspace; 144 int i; 145 Char *p; 146 Char **wargv; 147 ssize_t bytes; 148 149 /* Make sure we have enough space in the conversion buffer to store all 150 * the argv strings. */ 151 for (i = 0, bufspace = 0; i < argc; ++i) 152 bufspace += argv[i] ? strlen(argv[i]) + 1 : 0; 153 ct_conv_buff_resize(conv, 0, bufspace); 154 if (!conv->wsize) 155 return NULL; 156 157 wargv = el_malloc(argc * sizeof(*wargv)); 158 159 for (i = 0, p = conv->wbuff; i < argc; ++i) { 160 if (!argv[i]) { /* don't pass null pointers to mbstowcs */ 161 wargv[i] = NULL; 162 continue; 163 } else { 164 wargv[i] = p; 165 bytes = mbstowcs(p, argv[i], bufspace); 166 } 167 if (bytes == -1) { 168 el_free(wargv); 169 return NULL; 170 } else 171 bytes++; /* include '\0' in the count */ 172 bufspace -= bytes; 173 p += bytes; 174 } 175 176 return wargv; 177 } 178 179 180 private size_t 181 enc_width(Char c) 182 { 183 /* UTF-8 encoding specific values */ 184 if (c < 0x80) 185 return 1; 186 else if (c < 0x0800) 187 return 2; 188 else if (c < 0x10000) 189 return 3; 190 else if (c < 0x110000) 191 return 4; 192 else 193 return 0; /* not a valid codepoint */ 194 } 195 196 protected ssize_t 197 ct_encode_char(char *dst, size_t len, Char c) 198 { 199 ssize_t l = 0; 200 if (len < enc_width(c)) 201 return -1; 202 l = ct_wctomb(dst, c); 203 204 if (l < 0) { 205 ct_wctomb_reset; 206 l = 0; 207 } 208 return l; 209 } 210 #endif 211 212 protected const Char * 213 ct_visual_string(const Char *s) 214 { 215 static Char *buff = NULL; 216 static size_t buffsize = 0; 217 void *p; 218 Char *dst; 219 ssize_t used = 0; 220 221 if (!s) 222 return NULL; 223 if (!buff) { 224 buffsize = CT_BUFSIZ; 225 buff = el_malloc(buffsize * sizeof(*buff)); 226 } 227 dst = buff; 228 while (*s) { 229 used = ct_visual_char(dst, buffsize - (dst - buff), *s); 230 if (used == -1) { /* failed to encode, need more buffer space */ 231 used = dst - buff; 232 buffsize += CT_BUFSIZ; 233 p = el_realloc(buff, buffsize * sizeof(*buff)); 234 if (p == NULL) 235 goto out; 236 buff = p; 237 dst = buff + used; 238 /* don't increment s here - we want to retry it! */ 239 } 240 else 241 ++s; 242 dst += used; 243 } 244 if (dst >= (buff + buffsize)) { /* sigh */ 245 buffsize += 1; 246 p = el_realloc(buff, buffsize * sizeof(*buff)); 247 if (p == NULL) 248 goto out; 249 buff = p; 250 dst = buff + buffsize - 1; 251 } 252 *dst = 0; 253 return buff; 254 out: 255 el_free(buff); 256 buffsize = 0; 257 return NULL; 258 } 259 260 261 262 protected int 263 ct_visual_width(Char c) 264 { 265 int t = ct_chr_class(c); 266 switch (t) { 267 case CHTYPE_ASCIICTL: 268 return 2; /* ^@ ^? etc. */ 269 case CHTYPE_TAB: 270 return 1; /* Hmm, this really need to be handled outside! */ 271 case CHTYPE_NL: 272 return 0; /* Should this be 1 instead? */ 273 #ifdef WIDECHAR 274 case CHTYPE_PRINT: 275 return wcwidth(c); 276 case CHTYPE_NONPRINT: 277 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */ 278 return 8; /* \U+12345 */ 279 else 280 return 7; /* \U+1234 */ 281 #else 282 case CHTYPE_PRINT: 283 return 1; 284 case CHTYPE_NONPRINT: 285 return 4; /* \123 */ 286 #endif 287 default: 288 return 0; /* should not happen */ 289 } 290 } 291 292 293 protected ssize_t 294 ct_visual_char(Char *dst, size_t len, Char c) 295 { 296 int t = ct_chr_class(c); 297 switch (t) { 298 case CHTYPE_TAB: 299 case CHTYPE_NL: 300 case CHTYPE_ASCIICTL: 301 if (len < 2) 302 return -1; /* insufficient space */ 303 *dst++ = '^'; 304 if (c == '\177') 305 *dst = '?'; /* DEL -> ^? */ 306 else 307 *dst = c | 0100; /* uncontrolify it */ 308 return 2; 309 case CHTYPE_PRINT: 310 if (len < 1) 311 return -1; /* insufficient space */ 312 *dst = c; 313 return 1; 314 case CHTYPE_NONPRINT: 315 /* we only use single-width glyphs for display, 316 * so this is right */ 317 if ((ssize_t)len < ct_visual_width(c)) 318 return -1; /* insufficient space */ 319 #ifdef WIDECHAR 320 *dst++ = '\\'; 321 *dst++ = 'U'; 322 *dst++ = '+'; 323 #define tohexdigit(v) "0123456789ABCDEF"[v] 324 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */ 325 *dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf); 326 *dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf); 327 *dst++ = tohexdigit(((unsigned int) c >> 8) & 0xf); 328 *dst++ = tohexdigit(((unsigned int) c >> 4) & 0xf); 329 *dst = tohexdigit(((unsigned int) c ) & 0xf); 330 return (c > 0xffff) ? 8 : 7; 331 #else 332 *dst++ = '\\'; 333 #define tooctaldigit(v) ((v) + '0') 334 *dst++ = tooctaldigit(((unsigned int) c >> 6) & 0x7); 335 *dst++ = tooctaldigit(((unsigned int) c >> 3) & 0x7); 336 *dst++ = tooctaldigit(((unsigned int) c ) & 0x7); 337 #endif 338 /*FALLTHROUGH*/ 339 /* these two should be handled outside this function */ 340 default: /* we should never hit the default */ 341 return 0; 342 } 343 } 344 345 346 347 348 protected int 349 ct_chr_class(Char c) 350 { 351 if (c == '\t') 352 return CHTYPE_TAB; 353 else if (c == '\n') 354 return CHTYPE_NL; 355 else if (IsASCII(c) && Iscntrl(c)) 356 return CHTYPE_ASCIICTL; 357 else if (Isprint(c)) 358 return CHTYPE_PRINT; 359 else 360 return CHTYPE_NONPRINT; 361 } 362
Indexes created Sun Oct 12 02:09:55 GMT 2025