1 /*- 2 * Copyright 1986, Larry Wall 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following condition is met: 6 * 1. Redistributions of source code must retain the above copyright notice, 7 * this condition and the following disclaimer. 8 * 9 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 10 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 11 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 12 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 13 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 14 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 15 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 16 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 17 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 18 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 19 * SUCH DAMAGE. 20 * 21 * patch - a program to apply diffs to original files 22 * 23 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 24 * behaviour 25 * 26 * $OpenBSD: inp.c,v 1.36 2012/04/10 14:46:34 ajacoutot Exp $ 27 * $FreeBSD$ 28 */ 29 30 #include <sys/types.h> 31 #include <sys/file.h> 32 #include <sys/stat.h> 33 #include <sys/mman.h> 34 #include <sys/wait.h> 35 36 #include <ctype.h> 37 #include <errno.h> 38 #include <libgen.h> 39 #include <paths.h> 40 #include <spawn.h> 41 #include <stddef.h> 42 #include <stdint.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 48 #include "common.h" 49 #include "util.h" 50 #include "pch.h" 51 #include "inp.h" 52 53 54 /* Input-file-with-indexable-lines abstract type */ 55 56 static size_t i_size; /* size of the input file */ 57 static char *i_womp; /* plan a buffer for entire file */ 58 static char **i_ptr; /* pointers to lines in i_womp */ 59 static char empty_line[] = { '\0' }; 60 61 static int tifd = -1; /* plan b virtual string array */ 62 static char *tibuf[2]; /* plan b buffers */ 63 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ 64 static size_t lines_per_buf; /* how many lines per buffer */ 65 static size_t tibuflen; /* plan b buffer length */ 66 static size_t tireclen; /* length of records in tmp file */ 67 68 static bool rev_in_string(const char *); 69 static bool reallocate_lines(size_t *); 70 71 /* returns false if insufficient memory */ 72 static bool plan_a(const char *); 73 74 static void plan_b(const char *); 75 76 /* New patch--prepare to edit another file. */ 77 78 void 79 re_input(void) 80 { 81 if (using_plan_a) { 82 free(i_ptr); 83 i_ptr = NULL; 84 if (i_womp != NULL) { 85 munmap(i_womp, i_size); 86 i_womp = NULL; 87 } 88 i_size = 0; 89 } else { 90 using_plan_a = true; /* maybe the next one is smaller */ 91 close(tifd); 92 tifd = -1; 93 free(tibuf[0]); 94 free(tibuf[1]); 95 tibuf[0] = tibuf[1] = NULL; 96 tiline[0] = tiline[1] = -1; 97 tireclen = 0; 98 } 99 } 100 101 /* Construct the line index, somehow or other. */ 102 103 void 104 scan_input(const char *filename) 105 { 106 if (!plan_a(filename)) 107 plan_b(filename); 108 if (verbose) { 109 say("Patching file %s using Plan %s...\n", filename, 110 (using_plan_a ? "A" : "B")); 111 } 112 } 113 114 static bool 115 reallocate_lines(size_t *lines_allocated) 116 { 117 char **p; 118 size_t new_size; 119 120 new_size = *lines_allocated * 3 / 2; 121 p = realloc(i_ptr, (new_size + 2) * sizeof(char *)); 122 if (p == NULL) { /* shucks, it was a near thing */ 123 munmap(i_womp, i_size); 124 i_womp = NULL; 125 free(i_ptr); 126 i_ptr = NULL; 127 *lines_allocated = 0; 128 return false; 129 } 130 *lines_allocated = new_size; 131 i_ptr = p; 132 return true; 133 } 134 135 /* Try keeping everything in memory. */ 136 137 static bool 138 plan_a(const char *filename) 139 { 140 int ifd, statfailed, pstat; 141 char *p, *s, lbuf[INITLINELEN]; 142 struct stat filestat; 143 ptrdiff_t sz; 144 size_t i; 145 size_t iline, lines_allocated; 146 pid_t pid; 147 148 #ifdef DEBUGGING 149 if (debug & 8) 150 return false; 151 #endif 152 153 if (filename == NULL || *filename == '\0') 154 return false; 155 156 statfailed = stat(filename, &filestat); 157 if (statfailed && ok_to_create_file) { 158 if (verbose) 159 say("(Creating file %s...)\n", filename); 160 161 /* 162 * in check_patch case, we still display `Creating file' even 163 * though we're not. The rule is that -C should be as similar 164 * to normal patch behavior as possible 165 */ 166 if (check_only) 167 return true; 168 makedirs(filename, true); 169 close(creat(filename, 0666)); 170 statfailed = stat(filename, &filestat); 171 } 172 if (statfailed && check_only) 173 fatal("%s not found, -C mode, can't probe further\n", filename); 174 /* For nonexistent or read-only files, look for RCS versions. */ 175 176 if (statfailed || 177 /* No one can write to it. */ 178 (filestat.st_mode & 0222) == 0 || 179 /* I can't write to it. */ 180 ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { 181 char *filebase, *filedir; 182 struct stat cstat; 183 char *tmp_filename1, *tmp_filename2; 184 char *argp[4] = { NULL }; 185 posix_spawn_file_actions_t file_actions; 186 187 tmp_filename1 = strdup(filename); 188 tmp_filename2 = strdup(filename); 189 if (tmp_filename1 == NULL || tmp_filename2 == NULL) 190 fatal("strdupping filename"); 191 192 filebase = basename(tmp_filename1); 193 filedir = dirname(tmp_filename2); 194 195 memset(argp, 0, sizeof(argp)); 196 197 #define try(f, a1, a2, a3) \ 198 (snprintf(lbuf, sizeof(lbuf), f, a1, a2, a3), stat(lbuf, &cstat) == 0) 199 200 /* 201 * else we can't write to it but it's not under a version 202 * control system, so just proceed. 203 */ 204 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 205 try("%s/RCS/%s%s", filedir, filebase, "") || 206 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 207 if (!statfailed) { 208 if ((filestat.st_mode & 0222) != 0) 209 /* The owner can write to it. */ 210 fatal("file %s seems to be locked " 211 "by somebody else under RCS\n", 212 filename); 213 /* 214 * It might be checked out unlocked. See if 215 * it's safe to check out the default version 216 * locked. 217 */ 218 if (verbose) 219 say("Comparing file %s to default " 220 "RCS version...\n", filename); 221 222 argp[0] = __DECONST(char *, RCSDIFF); 223 argp[1] = __DECONST(char *, filename); 224 posix_spawn_file_actions_init(&file_actions); 225 posix_spawn_file_actions_addopen(&file_actions, 226 STDOUT_FILENO, _PATH_DEVNULL, O_WRONLY, 0); 227 if (posix_spawn(&pid, RCSDIFF, &file_actions, 228 NULL, argp, NULL) == 0) { 229 pid = waitpid(pid, &pstat, 0); 230 if (pid == -1 || WEXITSTATUS(pstat) != 0) 231 fatal("can't check out file %s: " 232 "differs from default RCS version\n", 233 filename); 234 } else 235 fatal("posix_spawn: %s\n", strerror(errno)); 236 posix_spawn_file_actions_destroy(&file_actions); 237 } 238 239 if (verbose) 240 say("Checking out file %s from RCS...\n", 241 filename); 242 243 argp[0] = __DECONST(char *, CHECKOUT); 244 argp[1] = __DECONST(char *, "-l"); 245 argp[2] = __DECONST(char *, filename); 246 if (posix_spawn(&pid, CHECKOUT, NULL, NULL, argp, 247 NULL) == 0) { 248 pid = waitpid(pid, &pstat, 0); 249 if (pid == -1 || WEXITSTATUS(pstat) != 0 || 250 stat(filename, &filestat)) 251 fatal("can't check out file %s from RCS\n", 252 filename); 253 } else 254 fatal("posix_spawn: %s\n", strerror(errno)); 255 } else if (statfailed) { 256 fatal("can't find %s\n", filename); 257 } 258 free(tmp_filename1); 259 free(tmp_filename2); 260 } 261 262 filemode = filestat.st_mode; 263 if (!S_ISREG(filemode)) 264 fatal("%s is not a normal file--can't patch\n", filename); 265 if ((uint64_t)filestat.st_size > SIZE_MAX) { 266 say("block too large to mmap\n"); 267 return false; 268 } 269 i_size = (size_t)filestat.st_size; 270 if (out_of_mem) { 271 set_hunkmax(); /* make sure dynamic arrays are allocated */ 272 out_of_mem = false; 273 return false; /* force plan b because plan a bombed */ 274 } 275 if ((ifd = open(filename, O_RDONLY)) < 0) 276 pfatal("can't open file %s", filename); 277 278 if (i_size) { 279 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 280 if (i_womp == MAP_FAILED) { 281 perror("mmap failed"); 282 i_womp = NULL; 283 close(ifd); 284 return false; 285 } 286 } else { 287 i_womp = NULL; 288 } 289 290 close(ifd); 291 if (i_size) 292 madvise(i_womp, i_size, MADV_SEQUENTIAL); 293 294 /* estimate the number of lines */ 295 lines_allocated = i_size / 25; 296 if (lines_allocated < 100) 297 lines_allocated = 100; 298 299 if (!reallocate_lines(&lines_allocated)) 300 return false; 301 302 /* now scan the buffer and build pointer array */ 303 iline = 1; 304 i_ptr[iline] = i_womp; 305 /* test for NUL too, to maintain the behavior of the original code */ 306 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 307 if (*s == '\n') { 308 if (iline == lines_allocated) { 309 if (!reallocate_lines(&lines_allocated)) 310 return false; 311 } 312 /* these are NOT NUL terminated */ 313 i_ptr[++iline] = s + 1; 314 } 315 } 316 /* if the last line contains no EOL, append one */ 317 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 318 last_line_missing_eol = true; 319 /* fix last line */ 320 sz = s - i_ptr[iline]; 321 p = malloc(sz + 1); 322 if (p == NULL) { 323 free(i_ptr); 324 i_ptr = NULL; 325 munmap(i_womp, i_size); 326 i_womp = NULL; 327 return false; 328 } 329 330 memcpy(p, i_ptr[iline], sz); 331 p[sz] = '\n'; 332 i_ptr[iline] = p; 333 /* count the extra line and make it point to some valid mem */ 334 i_ptr[++iline] = empty_line; 335 } else 336 last_line_missing_eol = false; 337 338 input_lines = iline - 1; 339 340 /* now check for revision, if any */ 341 342 if (revision != NULL) { 343 if (i_womp == NULL || !rev_in_string(i_womp)) { 344 if (force) { 345 if (verbose) 346 say("Warning: this file doesn't appear " 347 "to be the %s version--patching anyway.\n", 348 revision); 349 } else if (batch) { 350 fatal("this file doesn't appear to be the " 351 "%s version--aborting.\n", 352 revision); 353 } else { 354 ask("This file doesn't appear to be the " 355 "%s version--patch anyway? [n] ", 356 revision); 357 if (*buf != 'y') 358 fatal("aborted\n"); 359 } 360 } else if (verbose) 361 say("Good. This file appears to be the %s version.\n", 362 revision); 363 } 364 return true; /* plan a will work */ 365 } 366 367 /* Keep (virtually) nothing in memory. */ 368 369 static void 370 plan_b(const char *filename) 371 { 372 FILE *ifp; 373 size_t i = 0, j, len, maxlen = 1; 374 char *lbuf = NULL, *p; 375 bool found_revision = (revision == NULL); 376 377 using_plan_a = false; 378 if ((ifp = fopen(filename, "r")) == NULL) 379 pfatal("can't open file %s", filename); 380 unlink(TMPINNAME); 381 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 382 pfatal("can't open file %s", TMPINNAME); 383 while ((p = fgetln(ifp, &len)) != NULL) { 384 if (p[len - 1] == '\n') 385 p[len - 1] = '\0'; 386 else { 387 /* EOF without EOL, copy and add the NUL */ 388 if ((lbuf = malloc(len + 1)) == NULL) 389 fatal("out of memory\n"); 390 memcpy(lbuf, p, len); 391 lbuf[len] = '\0'; 392 p = lbuf; 393 394 last_line_missing_eol = true; 395 len++; 396 } 397 if (revision != NULL && !found_revision && rev_in_string(p)) 398 found_revision = true; 399 if (len > maxlen) 400 maxlen = len; /* find longest line */ 401 } 402 free(lbuf); 403 if (ferror(ifp)) 404 pfatal("can't read file %s", filename); 405 406 if (revision != NULL) { 407 if (!found_revision) { 408 if (force) { 409 if (verbose) 410 say("Warning: this file doesn't appear " 411 "to be the %s version--patching anyway.\n", 412 revision); 413 } else if (batch) { 414 fatal("this file doesn't appear to be the " 415 "%s version--aborting.\n", 416 revision); 417 } else { 418 ask("This file doesn't appear to be the %s " 419 "version--patch anyway? [n] ", 420 revision); 421 if (*buf != 'y') 422 fatal("aborted\n"); 423 } 424 } else if (verbose) 425 say("Good. This file appears to be the %s version.\n", 426 revision); 427 } 428 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 429 tireclen = maxlen; 430 tibuflen = maxlen > BUFFERSIZE ? maxlen : BUFFERSIZE; 431 lines_per_buf = tibuflen / maxlen; 432 tibuf[0] = malloc(tibuflen + 1); 433 if (tibuf[0] == NULL) 434 fatal("out of memory\n"); 435 tibuf[1] = malloc(tibuflen + 1); 436 if (tibuf[1] == NULL) 437 fatal("out of memory\n"); 438 for (i = 1;; i++) { 439 p = tibuf[0] + maxlen * (i % lines_per_buf); 440 if (i % lines_per_buf == 0) /* new block */ 441 if (write(tifd, tibuf[0], tibuflen) != 442 (ssize_t) tibuflen) 443 pfatal("can't write temp file"); 444 if (fgets(p, maxlen + 1, ifp) == NULL) { 445 input_lines = i - 1; 446 if (i % lines_per_buf != 0) 447 if (write(tifd, tibuf[0], tibuflen) != 448 (ssize_t) tibuflen) 449 pfatal("can't write temp file"); 450 break; 451 } 452 j = strlen(p); 453 /* These are '\n' terminated strings, so no need to add a NUL */ 454 if (j == 0 || p[j - 1] != '\n') 455 p[j] = '\n'; 456 } 457 fclose(ifp); 458 close(tifd); 459 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 460 pfatal("can't reopen file %s", TMPINNAME); 461 } 462 463 /* 464 * Fetch a line from the input file, \n terminated, not necessarily \0. 465 */ 466 char * 467 ifetch(LINENUM line, int whichbuf) 468 { 469 if (line < 1 || line > input_lines) { 470 if (warn_on_invalid_line) { 471 say("No such line %ld in input file, ignoring\n", line); 472 warn_on_invalid_line = false; 473 } 474 return NULL; 475 } 476 if (using_plan_a) 477 return i_ptr[line]; 478 else { 479 LINENUM offline = line % lines_per_buf; 480 LINENUM baseline = line - offline; 481 482 if (tiline[0] == baseline) 483 whichbuf = 0; 484 else if (tiline[1] == baseline) 485 whichbuf = 1; 486 else { 487 tiline[whichbuf] = baseline; 488 489 if (lseek(tifd, (off_t) (baseline / lines_per_buf * 490 tibuflen), SEEK_SET) < 0) 491 pfatal("cannot seek in the temporary input file"); 492 493 if (read(tifd, tibuf[whichbuf], tibuflen) != 494 (ssize_t) tibuflen) 495 pfatal("error reading tmp file %s", TMPINNAME); 496 } 497 return tibuf[whichbuf] + (tireclen * offline); 498 } 499 } 500 501 /* 502 * True if the string argument contains the revision number we want. 503 */ 504 static bool 505 rev_in_string(const char *string) 506 { 507 const char *s; 508 size_t patlen; 509 510 if (revision == NULL) 511 return true; 512 patlen = strlen(revision); 513 if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen])) 514 return true; 515 for (s = string; *s; s++) { 516 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) && 517 isspace((unsigned char)s[patlen + 1])) { 518 return true; 519 } 520 } 521 return false; 522 } 523