vis.c revision 1.30
1 /* $NetBSD: vis.c,v 1.30 2005/05/20 01:22:48 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 1999 The NetBSD Foundation, Inc. 34 * All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgement: 46 * This product includes software developed by the NetBSD 47 * Foundation, Inc. and its contributors. 48 * 4. Neither the name of The NetBSD Foundation nor the names of its 49 * contributors may be used to endorse or promote products derived 50 * from this software without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 53 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 54 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 55 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 56 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 57 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 58 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 59 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 60 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 61 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 62 * POSSIBILITY OF SUCH DAMAGE. 63 */ 64 65 #include <sys/cdefs.h> 66 #if defined(LIBC_SCCS) && !defined(lint) 67 __RCSID("$NetBSD: vis.c,v 1.30 2005/05/20 01:22:48 lukem Exp $"); 68 #endif /* LIBC_SCCS and not lint */ 69 70 #include "namespace.h" 71 #include <sys/types.h> 72 73 #include <assert.h> 74 #include <vis.h> 75 #include <stdlib.h> 76 77 #ifdef __weak_alias 78 __weak_alias(strsvis,_strsvis) 79 __weak_alias(strsvisx,_strsvisx) 80 __weak_alias(strvis,_strvis) 81 __weak_alias(strvisx,_strvisx) 82 __weak_alias(svis,_svis) 83 __weak_alias(vis,_vis) 84 #endif 85 86 #if !HAVE_VIS || !HAVE_SVIS 87 #include <ctype.h> 88 #include <limits.h> 89 #include <stdio.h> 90 #include <string.h> 91 92 #undef BELL 93 #define BELL '\a' 94 95 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') 96 #define iswhite(c) (c == ' ' || c == '\t' || c == '\n') 97 #define issafe(c) (c == '\b' || c == BELL || c == '\r') 98 #define xtoa(c) "0123456789abcdef"[c] 99 100 #define MAXEXTRAS 5 101 102 103 #define MAKEEXTRALIST(flag, extra, orig) \ 104 do { \ 105 const char *o = orig; \ 106 char *e; \ 107 while (*o++) \ 108 continue; \ 109 extra = alloca((size_t)((o - orig) + MAXEXTRAS)); \ 110 for (o = orig, e = extra; (*e++ = *o++) != '\0';) \ 111 continue; \ 112 e--; \ 113 if (flag & VIS_SP) *e++ = ' '; \ 114 if (flag & VIS_TAB) *e++ = '\t'; \ 115 if (flag & VIS_NL) *e++ = '\n'; \ 116 if ((flag & VIS_NOSLASH) == 0) *e++ = '\\'; \ 117 *e = '\0'; \ 118 } while (/*CONSTCOND*/0) 119 120 121 /* 122 * This is HVIS, the macro of vis used to HTTP style (RFC 1808) 123 */ 124 #define HVIS(dst, c, flag, nextc, extra) \ 125 do \ 126 if (!isascii(c) || !isalnum(c) || strchr("$-_.+!*'(),", c) != NULL) { \ 127 *dst++ = '%'; \ 128 *dst++ = xtoa(((unsigned int)c >> 4) & 0xf); \ 129 *dst++ = xtoa((unsigned int)c & 0xf); \ 130 } else { \ 131 SVIS(dst, c, flag, nextc, extra); \ 132 } \ 133 while (/*CONSTCOND*/0) 134 135 /* 136 * This is SVIS, the central macro of vis. 137 * dst: Pointer to the destination buffer 138 * c: Character to encode 139 * flag: Flag word 140 * nextc: The character following 'c' 141 * extra: Pointer to the list of extra characters to be 142 * backslash-protected. 143 */ 144 #define SVIS(dst, c, flag, nextc, extra) \ 145 do { \ 146 int isextra; \ 147 isextra = strchr(extra, c) != NULL; \ 148 if (!isextra && isascii(c) && (isgraph(c) || iswhite(c) || \ 149 ((flag & VIS_SAFE) && issafe(c)))) { \ 150 *dst++ = c; \ 151 break; \ 152 } \ 153 if (flag & VIS_CSTYLE) { \ 154 switch (c) { \ 155 case '\n': \ 156 *dst++ = '\\'; *dst++ = 'n'; \ 157 continue; \ 158 case '\r': \ 159 *dst++ = '\\'; *dst++ = 'r'; \ 160 continue; \ 161 case '\b': \ 162 *dst++ = '\\'; *dst++ = 'b'; \ 163 continue; \ 164 case BELL: \ 165 *dst++ = '\\'; *dst++ = 'a'; \ 166 continue; \ 167 case '\v': \ 168 *dst++ = '\\'; *dst++ = 'v'; \ 169 continue; \ 170 case '\t': \ 171 *dst++ = '\\'; *dst++ = 't'; \ 172 continue; \ 173 case '\f': \ 174 *dst++ = '\\'; *dst++ = 'f'; \ 175 continue; \ 176 case ' ': \ 177 *dst++ = '\\'; *dst++ = 's'; \ 178 continue; \ 179 case '\0': \ 180 *dst++ = '\\'; *dst++ = '0'; \ 181 if (isoctal(nextc)) { \ 182 *dst++ = '0'; \ 183 *dst++ = '0'; \ 184 } \ 185 continue; \ 186 default: \ 187 if (isgraph(c)) { \ 188 *dst++ = '\\'; *dst++ = c; \ 189 continue; \ 190 } \ 191 } \ 192 } \ 193 if (isextra || ((c & 0177) == ' ') || (flag & VIS_OCTAL)) { \ 194 *dst++ = '\\'; \ 195 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + '0'; \ 196 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + '0'; \ 197 *dst++ = (c & 07) + '0'; \ 198 } else { \ 199 if ((flag & VIS_NOSLASH) == 0) *dst++ = '\\'; \ 200 if (c & 0200) { \ 201 c &= 0177; *dst++ = 'M'; \ 202 } \ 203 if (iscntrl(c)) { \ 204 *dst++ = '^'; \ 205 if (c == 0177) \ 206 *dst++ = '?'; \ 207 else \ 208 *dst++ = c + '@'; \ 209 } else { \ 210 *dst++ = '-'; *dst++ = c; \ 211 } \ 212 } \ 213 } while (/*CONSTCOND*/0) 214 215 216 /* 217 * svis - visually encode characters, also encoding the characters 218 * pointed to by `extra' 219 */ 220 char * 221 svis(dst, c, flag, nextc, extra) 222 char *dst; 223 int c, flag, nextc; 224 const char *extra; 225 { 226 char *nextra; 227 _DIAGASSERT(dst != NULL); 228 _DIAGASSERT(extra != NULL); 229 MAKEEXTRALIST(flag, nextra, extra); 230 if (flag & VIS_HTTPSTYLE) 231 HVIS(dst, c, flag, nextc, nextra); 232 else 233 SVIS(dst, c, flag, nextc, nextra); 234 *dst = '\0'; 235 return(dst); 236 } 237 238 239 /* 240 * strsvis, strsvisx - visually encode characters from src into dst 241 * 242 * Extra is a pointer to a \0-terminated list of characters to 243 * be encoded, too. These functions are useful e. g. to 244 * encode strings in such a way so that they are not interpreted 245 * by a shell. 246 * 247 * Dst must be 4 times the size of src to account for possible 248 * expansion. The length of dst, not including the trailing NULL, 249 * is returned. 250 * 251 * Strsvisx encodes exactly len bytes from src into dst. 252 * This is useful for encoding a block of data. 253 */ 254 int 255 strsvis(dst, csrc, flag, extra) 256 char *dst; 257 const char *csrc; 258 int flag; 259 const char *extra; 260 { 261 int c; 262 char *start; 263 char *nextra; 264 const unsigned char *src = (const unsigned char *)csrc; 265 266 _DIAGASSERT(dst != NULL); 267 _DIAGASSERT(src != NULL); 268 _DIAGASSERT(extra != NULL); 269 MAKEEXTRALIST(flag, nextra, extra); 270 if (flag & VIS_HTTPSTYLE) { 271 for (start = dst; (c = *src++) != '\0'; /* empty */) 272 HVIS(dst, c, flag, *src, nextra); 273 } else { 274 for (start = dst; (c = *src++) != '\0'; /* empty */) 275 SVIS(dst, c, flag, *src, nextra); 276 } 277 *dst = '\0'; 278 return (dst - start); 279 } 280 281 282 int 283 strsvisx(dst, csrc, len, flag, extra) 284 char *dst; 285 const char *csrc; 286 size_t len; 287 int flag; 288 const char *extra; 289 { 290 unsigned char c; 291 char *start; 292 char *nextra; 293 const unsigned char *src = (const unsigned char *)csrc; 294 295 _DIAGASSERT(dst != NULL); 296 _DIAGASSERT(src != NULL); 297 _DIAGASSERT(extra != NULL); 298 MAKEEXTRALIST(flag, nextra, extra); 299 300 if (flag & VIS_HTTPSTYLE) { 301 for (start = dst; len > 0; len--) { 302 c = *src++; 303 HVIS(dst, c, flag, len ? *src : '\0', nextra); 304 } 305 } else { 306 for (start = dst; len > 0; len--) { 307 c = *src++; 308 SVIS(dst, c, flag, len ? *src : '\0', nextra); 309 } 310 } 311 *dst = '\0'; 312 return (dst - start); 313 } 314 #endif 315 316 #if !HAVE_VIS 317 /* 318 * vis - visually encode characters 319 */ 320 char * 321 vis(dst, c, flag, nextc) 322 char *dst; 323 int c, flag, nextc; 324 325 { 326 char *extra; 327 unsigned char uc = (unsigned char)c; 328 329 _DIAGASSERT(dst != NULL); 330 331 MAKEEXTRALIST(flag, extra, ""); 332 if (flag & VIS_HTTPSTYLE) 333 HVIS(dst, uc, flag, nextc, extra); 334 else 335 SVIS(dst, uc, flag, nextc, extra); 336 *dst = '\0'; 337 return (dst); 338 } 339 340 341 /* 342 * strvis, strvisx - visually encode characters from src into dst 343 * 344 * Dst must be 4 times the size of src to account for possible 345 * expansion. The length of dst, not including the trailing NULL, 346 * is returned. 347 * 348 * Strvisx encodes exactly len bytes from src into dst. 349 * This is useful for encoding a block of data. 350 */ 351 int 352 strvis(dst, src, flag) 353 char *dst; 354 const char *src; 355 int flag; 356 { 357 char *extra; 358 359 MAKEEXTRALIST(flag, extra, ""); 360 return (strsvis(dst, src, flag, extra)); 361 } 362 363 364 int 365 strvisx(dst, src, len, flag) 366 char *dst; 367 const char *src; 368 size_t len; 369 int flag; 370 { 371 char *extra; 372 373 MAKEEXTRALIST(flag, extra, ""); 374 return (strsvisx(dst, src, len, flag, extra)); 375 } 376 #endif 377
Indexes created Tue Sep 23 07:09:52 GMT 2025