Mercurial > ~dholland > hg > tradcpp > index.cgi
annotate files.c @ 203:3a25180d3a5c
Abort on line numbering or column numbering overflow.
Line numbers are limited to values that fit in "unsigned int". Also
reject input lines longer than 2^32-1 characters. It seems reasonable
to presume that any input that violates these constraints is someone
screwing around and not a serious attempt to compile or preprocess
anything useful. Done in response to n2129, but without getting into
any of the silliness found there.
| author | David A. Holland |
|---|---|
| date | Tue, 01 Aug 2017 14:51:04 -0400 |
| parents | 1d2bad7151f9 |
| children |
| rev | line source |
|---|---|
| 30 | 1 /*- |
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2 * Copyright (c) 2010, 2013 The NetBSD Foundation, Inc. |
| 30 | 3 * All rights reserved. |
| 4 * | |
| 5 * This code is derived from software contributed to The NetBSD Foundation | |
| 6 * by David A. Holland. | |
| 7 * | |
| 8 * Redistribution and use in source and binary forms, with or without | |
| 9 * modification, are permitted provided that the following conditions | |
| 10 * are met: | |
| 11 * 1. Redistributions of source code must retain the above copyright | |
| 12 * notice, this list of conditions and the following disclaimer. | |
| 13 * 2. Redistributions in binary form must reproduce the above copyright | |
| 14 * notice, this list of conditions and the following disclaimer in the | |
| 15 * documentation and/or other materials provided with the distribution. | |
| 16 * | |
| 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS | |
| 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED | |
| 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS | |
| 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 27 * POSSIBILITY OF SUCH DAMAGE. | |
| 28 */ | |
| 29 | |
| 6 | 30 #include <stdio.h> |
| 31 #include <stdlib.h> | |
| 13 | 32 #include <string.h> |
| 6 | 33 #include <unistd.h> |
| 34 #include <fcntl.h> | |
|
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35 #include <errno.h> |
| 6 | 36 |
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37 #include "bool.h" |
| 6 | 38 #include "array.h" |
| 15 | 39 #include "mode.h" |
| 8 | 40 #include "place.h" |
| 6 | 41 #include "files.h" |
| 15 | 42 #include "directive.h" |
| 6 | 43 |
| 44 struct incdir { | |
| 45 const char *name; | |
| 46 bool issystem; | |
| 47 }; | |
| 48 | |
| 107 | 49 DECLARRAY(incdir, static UNUSED); |
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50 DEFARRAY(incdir, static); |
| 6 | 51 |
| 52 static struct incdirarray quotepath, bracketpath; | |
| 53 | |
| 54 //////////////////////////////////////////////////////////// | |
| 55 // management | |
| 56 | |
| 57 static | |
| 58 struct incdir * | |
| 59 incdir_create(const char *name, bool issystem) | |
| 60 { | |
| 61 struct incdir *id; | |
| 62 | |
| 63 id = domalloc(sizeof(*id)); | |
| 64 id->name = name; | |
| 65 id->issystem = issystem; | |
| 66 return id; | |
| 67 } | |
| 68 | |
| 69 static | |
| 70 void | |
| 71 incdir_destroy(struct incdir *id) | |
| 72 { | |
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73 dofree(id, sizeof(*id)); |
| 6 | 74 } |
| 75 | |
| 76 void | |
| 77 files_init(void) | |
| 78 { | |
| 79 incdirarray_init("epath); | |
| 80 incdirarray_init(&bracketpath); | |
| 81 } | |
| 82 | |
| 9 | 83 DESTROYALL_ARRAY(incdir, ); |
| 6 | 84 |
| 85 void | |
| 86 files_cleanup(void) | |
| 87 { | |
| 88 incdirarray_destroyall("epath); | |
| 89 incdirarray_cleanup("epath); | |
| 90 incdirarray_destroyall(&bracketpath); | |
| 91 incdirarray_cleanup(&bracketpath); | |
| 92 } | |
| 93 | |
| 94 //////////////////////////////////////////////////////////// | |
| 95 // path setup | |
| 96 | |
| 97 void | |
| 98 files_addquotepath(const char *dir, bool issystem) | |
| 99 { | |
| 100 struct incdir *id; | |
| 101 | |
| 102 id = incdir_create(dir, issystem); | |
| 103 incdirarray_add("epath, id, NULL); | |
| 104 } | |
| 105 | |
| 106 void | |
| 107 files_addbracketpath(const char *dir, bool issystem) | |
| 108 { | |
| 109 struct incdir *id; | |
| 110 | |
| 111 id = incdir_create(dir, issystem); | |
| 112 incdirarray_add(&bracketpath, id, NULL); | |
| 113 } | |
| 114 | |
| 115 //////////////////////////////////////////////////////////// | |
| 116 // parsing | |
| 117 | |
| 75 | 118 /* |
| 119 * Find the end of the logical line. End of line characters that are | |
| 120 * commented out do not count. | |
| 121 */ | |
| 15 | 122 static |
| 123 size_t | |
| 75 | 124 findeol(const char *buf, size_t start, size_t limit) |
| 15 | 125 { |
| 126 size_t i; | |
| 75 | 127 int incomment = 0; |
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128 bool inquote = false; |
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129 char quote = '\0'; |
| 75 | 130 |
| 131 for (i=start; i<limit; i++) { | |
| 132 if (incomment) { | |
| 133 if (i+1 < limit && buf[i] == '*' && buf[i+1] == '/') { | |
| 134 i++; | |
| 135 incomment = 0; | |
| 136 } | |
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137 } else if (!inquote && i+1 < limit && |
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138 buf[i] == '/' && buf[i+1] == '*') { |
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139 i++; |
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140 incomment = 1; |
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141 } else if (i+1 < limit && |
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142 buf[i] == '\\' && buf[i+1] != '\n') { |
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143 i++; |
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144 } else if (!inquote && (buf[i] == '"' || buf[i] == '\'')) { |
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145 inquote = true; |
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146 quote = buf[i]; |
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147 } else if (inquote && buf[i] == quote) { |
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148 inquote = false; |
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149 } else if (buf[i] == '\n') { |
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150 return i; |
| 75 | 151 } |
| 152 } | |
| 153 return limit; | |
| 154 } | |
| 155 | |
| 156 static | |
| 157 unsigned | |
| 158 countnls(const char *buf, size_t start, size_t limit) | |
| 159 { | |
| 160 size_t i; | |
| 161 unsigned count = 0; | |
| 15 | 162 |
| 163 for (i=start; i<limit; i++) { | |
| 164 if (buf[i] == '\n') { | |
| 75 | 165 count++; |
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166 if (count == 0) { |
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167 /* just return the max and error downstream */ |
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168 return count - 1; |
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169 } |
| 15 | 170 } |
| 171 } | |
| 75 | 172 return count; |
| 15 | 173 } |
| 174 | |
| 175 static | |
| 6 | 176 void |
| 28 | 177 file_read(const struct placefile *pf, int fd, const char *name, bool toplevel) |
| 15 | 178 { |
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179 struct lineplace places; |
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180 struct place ptmp; |
| 15 | 181 size_t bufend, bufmax, linestart, lineend, nextlinestart, tmp; |
| 182 ssize_t result; | |
| 183 bool ateof = false; | |
| 184 char *buf; | |
| 185 | |
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186 place_setfilestart(&places.current, pf); |
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187 places.nextline = places.current; |
| 15 | 188 |
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189 if (name) { |
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190 debuglog(&places.current, "Reading file %s", name); |
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191 } else { |
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192 debuglog(&places.current, "Reading standard input"); |
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193 } |
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194 |
| 15 | 195 bufmax = 128; |
| 196 bufend = 0; | |
| 197 linestart = 0; | |
| 198 lineend = 0; | |
| 199 buf = domalloc(bufmax); | |
| 200 | |
| 201 while (1) { | |
| 202 if (lineend >= bufend) { | |
| 203 /* do not have a whole line in the buffer; read more */ | |
| 75 | 204 assert(bufend >= linestart); |
| 15 | 205 if (linestart > 0 && bufend > linestart) { |
| 206 /* slide to beginning of buffer */ | |
| 207 memmove(buf, buf+linestart, bufend-linestart); | |
| 208 bufend -= linestart; | |
| 209 lineend -= linestart; | |
| 210 linestart = 0; | |
| 211 } | |
| 212 if (bufend >= bufmax) { | |
| 213 /* need bigger buffer */ | |
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214 buf = dorealloc(buf, bufmax, bufmax*2); |
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215 bufmax = bufmax*2; |
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216 /* just in case someone's screwing around */ |
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217 if (bufmax > 0xffffffff) { |
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218 complain(&places.current, |
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219 "Input line too long"); |
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220 die(); |
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221 } |
| 15 | 222 } |
| 223 | |
| 224 if (ateof) { | |
| 225 /* don't read again, in case it's a socket */ | |
| 226 result = 0; | |
| 227 } else { | |
| 228 result = read(fd, buf+bufend, bufmax - bufend); | |
| 229 } | |
| 230 | |
| 231 if (result == -1) { | |
| 232 /* read error */ | |
| 143 | 233 complain(NULL, "%s: %s", |
| 234 name, strerror(errno)); | |
| 15 | 235 complain_fail(); |
| 236 } else if (result == 0 && bufend == linestart) { | |
| 237 /* eof */ | |
| 238 ateof = true; | |
| 239 break; | |
| 240 } else if (result == 0) { | |
| 241 /* eof in middle of line */ | |
| 242 ateof = true; | |
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243 ptmp = places.current; |
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244 place_addcolumns(&ptmp, bufend - linestart); |
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245 if (buf[bufend - 1] == '\n') { |
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246 complain(&ptmp, "Unclosed comment"); |
| 187 | 247 complain_fail(); |
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248 } else { |
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249 complain(&ptmp, |
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250 "No newline at end of file"); |
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251 } |
| 15 | 252 if (mode.werror) { |
| 253 complain_fail(); | |
| 254 } | |
| 255 assert(bufend < bufmax); | |
| 256 lineend = bufend++; | |
| 257 buf[lineend] = '\n'; | |
| 258 } else { | |
| 259 bufend += (size_t)result; | |
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260 lineend = findeol(buf, linestart, bufend); |
| 15 | 261 } |
| 262 /* loop in case we still don't have a whole line */ | |
| 263 continue; | |
| 264 } | |
| 265 | |
| 266 /* have a line */ | |
| 267 assert(buf[lineend] == '\n'); | |
| 268 buf[lineend] = '\0'; | |
| 269 nextlinestart = lineend+1; | |
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270 place_addlines(&places.nextline, 1); |
| 15 | 271 |
| 272 /* check for CR/NL */ | |
| 273 if (lineend > 0 && buf[lineend-1] == '\r') { | |
| 274 buf[lineend-1] = '\0'; | |
| 275 lineend--; | |
| 276 } | |
| 277 | |
| 278 /* check for continuation line */ | |
| 279 if (lineend > 0 && buf[lineend-1]=='\\') { | |
| 280 lineend--; | |
| 281 tmp = nextlinestart - lineend; | |
| 282 if (bufend > nextlinestart) { | |
| 283 memmove(buf+lineend, buf+nextlinestart, | |
| 284 bufend - nextlinestart); | |
| 285 } | |
| 286 bufend -= tmp; | |
| 287 nextlinestart -= tmp; | |
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288 lineend = findeol(buf, linestart, bufend); |
| 15 | 289 /* might not have a whole line, so loop */ |
| 290 continue; | |
| 291 } | |
| 292 | |
| 293 /* line now goes from linestart to lineend */ | |
| 294 assert(buf[lineend] == '\0'); | |
| 75 | 295 |
| 296 /* count how many commented-out newlines we swallowed */ | |
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297 place_addlines(&places.nextline, |
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298 countnls(buf, linestart, lineend)); |
| 75 | 299 |
| 175 | 300 /* process the line (even if it's empty) */ |
| 301 directive_gotline(&places, buf+linestart, lineend-linestart); | |
| 15 | 302 |
| 303 linestart = nextlinestart; | |
| 75 | 304 lineend = findeol(buf, linestart, bufend); |
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305 places.current = places.nextline; |
| 15 | 306 } |
| 307 | |
| 28 | 308 if (toplevel) { |
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309 directive_goteof(&places.current); |
| 28 | 310 } |
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311 dofree(buf, bufmax); |
| 15 | 312 } |
| 6 | 313 |
| 314 //////////////////////////////////////////////////////////// | |
| 315 // path search | |
| 316 | |
| 317 static | |
| 13 | 318 char * |
| 112 | 319 mkfilename(struct place *place, const char *dir, const char *file) |
| 13 | 320 { |
| 321 size_t dlen, flen, rlen; | |
| 322 char *ret; | |
| 323 bool needslash = false; | |
| 324 | |
| 112 | 325 if (dir == NULL) { |
| 326 dir = place_getparsedir(place); | |
| 327 } | |
| 328 | |
| 13 | 329 dlen = strlen(dir); |
| 330 flen = strlen(file); | |
| 331 if (dlen > 0 && dir[dlen-1] != '/') { | |
| 332 needslash = true; | |
| 333 } | |
| 334 | |
| 335 rlen = dlen + (needslash ? 1 : 0) + flen; | |
| 336 ret = domalloc(rlen + 1); | |
| 337 strcpy(ret, dir); | |
| 338 if (needslash) { | |
| 339 strcat(ret, "/"); | |
| 340 } | |
| 341 strcat(ret, file); | |
| 342 return ret; | |
| 343 } | |
| 344 | |
| 345 static | |
| 6 | 346 int |
| 347 file_tryopen(const char *file) | |
| 348 { | |
| 349 int fd; | |
| 350 | |
| 15 | 351 /* XXX check for non-regular files */ |
| 352 | |
| 6 | 353 fd = open(file, O_RDONLY); |
| 354 if (fd < 0) { | |
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355 if (errno != ENOENT && errno != ENOTDIR) { |
| 143 | 356 complain(NULL, "%s: %s", file, strerror(errno)); |
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357 } |
| 6 | 358 return -1; |
| 359 } | |
| 15 | 360 |
| 6 | 361 return fd; |
| 362 } | |
| 363 | |
| 364 static | |
| 365 void | |
| 366 file_search(struct place *place, struct incdirarray *path, const char *name) | |
| 367 { | |
| 368 unsigned i, num; | |
| 369 struct incdir *id; | |
| 13 | 370 const struct placefile *pf; |
| 6 | 371 char *file; |
| 372 int fd; | |
| 373 | |
| 374 assert(place != NULL); | |
| 375 | |
| 104 | 376 if (name[0] == '/') { |
| 377 fd = file_tryopen(name); | |
| 6 | 378 if (fd >= 0) { |
| 104 | 379 pf = place_addfile(place, name, true); |
| 380 file_read(pf, fd, name, false); | |
| 6 | 381 close(fd); |
| 382 return; | |
| 383 } | |
| 104 | 384 } else { |
| 385 num = incdirarray_num(path); | |
| 386 for (i=0; i<num; i++) { | |
| 387 id = incdirarray_get(path, i); | |
| 112 | 388 file = mkfilename(place, id->name, name); |
| 104 | 389 fd = file_tryopen(file); |
| 390 if (fd >= 0) { | |
| 391 pf = place_addfile(place, file, id->issystem); | |
| 392 file_read(pf, fd, file, false); | |
| 393 dostrfree(file); | |
| 394 close(fd); | |
| 395 return; | |
| 396 } | |
| 397 dostrfree(file); | |
| 398 } | |
| 6 | 399 } |
| 400 complain(place, "Include file %s not found", name); | |
| 401 complain_fail(); | |
| 402 } | |
| 403 | |
| 404 void | |
| 405 file_readquote(struct place *place, const char *name) | |
| 406 { | |
| 407 file_search(place, "epath, name); | |
| 408 } | |
| 409 | |
| 410 void | |
| 411 file_readbracket(struct place *place, const char *name) | |
| 412 { | |
| 413 file_search(place, &bracketpath, name); | |
| 414 } | |
| 415 | |
| 416 void | |
| 417 file_readabsolute(struct place *place, const char *name) | |
| 418 { | |
| 13 | 419 const struct placefile *pf; |
| 6 | 420 int fd; |
| 421 | |
| 422 assert(place != NULL); | |
| 423 | |
| 24 | 424 if (name == NULL) { |
| 425 fd = STDIN_FILENO; | |
| 426 pf = place_addfile(place, "<standard-input>", false); | |
| 427 } else { | |
| 428 fd = file_tryopen(name); | |
| 429 if (fd < 0) { | |
| 143 | 430 complain(NULL, "%s: %s", name, strerror(errno)); |
| 24 | 431 die(); |
| 432 } | |
| 433 pf = place_addfile(place, name, false); | |
| 6 | 434 } |
| 24 | 435 |
| 28 | 436 file_read(pf, fd, name, true); |
| 24 | 437 |
| 438 if (name != NULL) { | |
| 439 close(fd); | |
| 440 } | |
| 6 | 441 } |