1 /* $NetBSD: chartype.c,v 1.35 2019/07/23 10:18:52 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 1.35 2019/07/23 10:18:52 christos 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)); 161 162 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 wargv[i] = NULL; 179 180 return wargv; 181 } 182 183 184 libedit_private size_t 185 ct_enc_width(wchar_t c) 186 { 187 mbstate_t mbs; 188 char buf[MB_LEN_MAX]; 189 size_t size; 190 memset(&mbs, 0, sizeof(mbs)); 191 192 if ((size = wcrtomb(buf, c, &mbs)) == (size_t)-1) 193 return 0; 194 return size; 195 } 196 197 libedit_private ssize_t 198 ct_encode_char(char *dst, size_t len, wchar_t c) 199 { 200 ssize_t l = 0; 201 if (len < ct_enc_width(c)) 202 return -1; 203 l = wctomb(dst, c); 204 205 if (l < 0) { 206 wctomb(NULL, L'\0'); 207 l = 0; 208 } 209 return l; 210 } 211 212 libedit_private const wchar_t * 213 ct_visual_string(const wchar_t *s, ct_buffer_t *conv) 214 { 215 wchar_t *dst; 216 ssize_t used; 217 218 if (!s) 219 return NULL; 220 221 if (ct_conv_wbuff_resize(conv, CT_BUFSIZ) == -1) 222 return NULL; 223 224 used = 0; 225 dst = conv->wbuff; 226 while (*s) { 227 used = ct_visual_char(dst, 228 conv->wsize - (size_t)(dst - conv->wbuff), *s); 229 if (used != -1) { 230 ++s; 231 dst += used; 232 continue; 233 } 234 235 /* failed to encode, need more buffer space */ 236 used = dst - conv->wbuff; 237 if (ct_conv_wbuff_resize(conv, conv->wsize + CT_BUFSIZ) == -1) 238 return NULL; 239 dst = conv->wbuff + used; 240 } 241 242 if (dst >= (conv->wbuff + conv->wsize)) { /* sigh */ 243 used = dst - conv->wbuff; 244 if (ct_conv_wbuff_resize(conv, conv->wsize + CT_BUFSIZ) == -1) 245 return NULL; 246 dst = conv->wbuff + used; 247 } 248 249 *dst = L'\0'; 250 return conv->wbuff; 251 } 252 253 254 255 libedit_private int 256 ct_visual_width(wchar_t c) 257 { 258 int t = ct_chr_class(c); 259 switch (t) { 260 case CHTYPE_ASCIICTL: 261 return 2; /* ^@ ^? etc. */ 262 case CHTYPE_TAB: 263 return 1; /* Hmm, this really need to be handled outside! */ 264 case CHTYPE_NL: 265 return 0; /* Should this be 1 instead? */ 266 case CHTYPE_PRINT: 267 return wcwidth(c); 268 case CHTYPE_NONPRINT: 269 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */ 270 return 8; /* \U+12345 */ 271 else 272 return 7; /* \U+1234 */ 273 default: 274 return 0; /* should not happen */ 275 } 276 } 277 278 279 libedit_private ssize_t 280 ct_visual_char(wchar_t *dst, size_t len, wchar_t c) 281 { 282 int t = ct_chr_class(c); 283 switch (t) { 284 case CHTYPE_TAB: 285 case CHTYPE_NL: 286 case CHTYPE_ASCIICTL: 287 if (len < 2) 288 return -1; /* insufficient space */ 289 *dst++ = '^'; 290 if (c == '\177') 291 *dst = '?'; /* DEL -> ^? */ 292 else 293 *dst = c | 0100; /* uncontrolify it */ 294 return 2; 295 case CHTYPE_PRINT: 296 if (len < 1) 297 return -1; /* insufficient space */ 298 *dst = c; 299 return 1; 300 case CHTYPE_NONPRINT: 301 /* we only use single-width glyphs for display, 302 * so this is right */ 303 if ((ssize_t)len < ct_visual_width(c)) 304 return -1; /* insufficient space */ 305 *dst++ = '\\'; 306 *dst++ = 'U'; 307 *dst++ = '+'; 308 #define tohexdigit(v) "0123456789ABCDEF"[v] 309 if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */ 310 *dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf); 311 *dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf); 312 *dst++ = tohexdigit(((unsigned int) c >> 8) & 0xf); 313 *dst++ = tohexdigit(((unsigned int) c >> 4) & 0xf); 314 *dst = tohexdigit(((unsigned int) c ) & 0xf); 315 return c > 0xffff ? 8 : 7; 316 /*FALLTHROUGH*/ 317 /* these two should be handled outside this function */ 318 default: /* we should never hit the default */ 319 return 0; 320 } 321 } 322 323 324 325 326 libedit_private int 327 ct_chr_class(wchar_t c) 328 { 329 if (c == '\t') 330 return CHTYPE_TAB; 331 else if (c == '\n') 332 return CHTYPE_NL; 333 else if (c < 0x100 && iswcntrl(c)) 334 return CHTYPE_ASCIICTL; 335 else if (iswprint(c)) 336 return CHTYPE_PRINT; 337 else 338 return CHTYPE_NONPRINT; 339 } 340