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] = strdup(RCSDIFF); 223 argp[1] = strdup(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 free(argp[1]); 238 free(argp[0]); 239 } 240 241 if (verbose) 242 say("Checking out file %s from RCS...\n", 243 filename); 244 245 argp[0] = strdup(CHECKOUT); 246 argp[1] = strdup("-l"); 247 argp[2] = strdup(filename); 248 if (posix_spawn(&pid, CHECKOUT, NULL, NULL, argp, 249 NULL) == 0) { 250 pid = waitpid(pid, &pstat, 0); 251 if (pid == -1 || WEXITSTATUS(pstat) != 0 || 252 stat(filename, &filestat)) 253 fatal("can't check out file %s from RCS\n", 254 filename); 255 } else 256 fatal("posix_spawn: %s\n", strerror(errno)); 257 free(argp[2]); 258 free(argp[1]); 259 free(argp[0]); 260 } else if (statfailed) { 261 fatal("can't find %s\n", filename); 262 } 263 free(tmp_filename1); 264 free(tmp_filename2); 265 } 266 267 filemode = filestat.st_mode; 268 if (!S_ISREG(filemode)) 269 fatal("%s is not a normal file--can't patch\n", filename); 270 if ((uint64_t)filestat.st_size > SIZE_MAX) { 271 say("block too large to mmap\n"); 272 return false; 273 } 274 i_size = (size_t)filestat.st_size; 275 if (out_of_mem) { 276 set_hunkmax(); /* make sure dynamic arrays are allocated */ 277 out_of_mem = false; 278 return false; /* force plan b because plan a bombed */ 279 } 280 if ((ifd = open(filename, O_RDONLY)) < 0) 281 pfatal("can't open file %s", filename); 282 283 if (i_size) { 284 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 285 if (i_womp == MAP_FAILED) { 286 perror("mmap failed"); 287 i_womp = NULL; 288 close(ifd); 289 return false; 290 } 291 } else { 292 i_womp = NULL; 293 } 294 295 close(ifd); 296 if (i_size) 297 madvise(i_womp, i_size, MADV_SEQUENTIAL); 298 299 /* estimate the number of lines */ 300 lines_allocated = i_size / 25; 301 if (lines_allocated < 100) 302 lines_allocated = 100; 303 304 if (!reallocate_lines(&lines_allocated)) 305 return false; 306 307 /* now scan the buffer and build pointer array */ 308 iline = 1; 309 i_ptr[iline] = i_womp; 310 /* test for NUL too, to maintain the behavior of the original code */ 311 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 312 if (*s == '\n') { 313 if (iline == lines_allocated) { 314 if (!reallocate_lines(&lines_allocated)) 315 return false; 316 } 317 /* these are NOT NUL terminated */ 318 i_ptr[++iline] = s + 1; 319 } 320 } 321 /* if the last line contains no EOL, append one */ 322 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 323 last_line_missing_eol = true; 324 /* fix last line */ 325 sz = s - i_ptr[iline]; 326 p = malloc(sz + 1); 327 if (p == NULL) { 328 free(i_ptr); 329 i_ptr = NULL; 330 munmap(i_womp, i_size); 331 i_womp = NULL; 332 return false; 333 } 334 335 memcpy(p, i_ptr[iline], sz); 336 p[sz] = '\n'; 337 i_ptr[iline] = p; 338 /* count the extra line and make it point to some valid mem */ 339 i_ptr[++iline] = empty_line; 340 } else 341 last_line_missing_eol = false; 342 343 input_lines = iline - 1; 344 345 /* now check for revision, if any */ 346 347 if (revision != NULL) { 348 if (i_womp == NULL || !rev_in_string(i_womp)) { 349 if (force) { 350 if (verbose) 351 say("Warning: this file doesn't appear " 352 "to be the %s version--patching anyway.\n", 353 revision); 354 } else if (batch) { 355 fatal("this file doesn't appear to be the " 356 "%s version--aborting.\n", 357 revision); 358 } else { 359 ask("This file doesn't appear to be the " 360 "%s version--patch anyway? [n] ", 361 revision); 362 if (*buf != 'y') 363 fatal("aborted\n"); 364 } 365 } else if (verbose) 366 say("Good. This file appears to be the %s version.\n", 367 revision); 368 } 369 return true; /* plan a will work */ 370 } 371 372 /* Keep (virtually) nothing in memory. */ 373 374 static void 375 plan_b(const char *filename) 376 { 377 FILE *ifp; 378 size_t i = 0, j, len, maxlen = 1; 379 char *lbuf = NULL, *p; 380 bool found_revision = (revision == NULL); 381 382 using_plan_a = false; 383 if ((ifp = fopen(filename, "r")) == NULL) 384 pfatal("can't open file %s", filename); 385 unlink(TMPINNAME); 386 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 387 pfatal("can't open file %s", TMPINNAME); 388 while ((p = fgetln(ifp, &len)) != NULL) { 389 if (p[len - 1] == '\n') 390 p[len - 1] = '\0'; 391 else { 392 /* EOF without EOL, copy and add the NUL */ 393 if ((lbuf = malloc(len + 1)) == NULL) 394 fatal("out of memory\n"); 395 memcpy(lbuf, p, len); 396 lbuf[len] = '\0'; 397 p = lbuf; 398 399 last_line_missing_eol = true; 400 len++; 401 } 402 if (revision != NULL && !found_revision && rev_in_string(p)) 403 found_revision = true; 404 if (len > maxlen) 405 maxlen = len; /* find longest line */ 406 } 407 free(lbuf); 408 if (ferror(ifp)) 409 pfatal("can't read file %s", filename); 410 411 if (revision != NULL) { 412 if (!found_revision) { 413 if (force) { 414 if (verbose) 415 say("Warning: this file doesn't appear " 416 "to be the %s version--patching anyway.\n", 417 revision); 418 } else if (batch) { 419 fatal("this file doesn't appear to be the " 420 "%s version--aborting.\n", 421 revision); 422 } else { 423 ask("This file doesn't appear to be the %s " 424 "version--patch anyway? [n] ", 425 revision); 426 if (*buf != 'y') 427 fatal("aborted\n"); 428 } 429 } else if (verbose) 430 say("Good. This file appears to be the %s version.\n", 431 revision); 432 } 433 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 434 tireclen = maxlen; 435 tibuflen = maxlen > BUFFERSIZE ? maxlen : BUFFERSIZE; 436 lines_per_buf = tibuflen / maxlen; 437 tibuf[0] = malloc(tibuflen + 1); 438 if (tibuf[0] == NULL) 439 fatal("out of memory\n"); 440 tibuf[1] = malloc(tibuflen + 1); 441 if (tibuf[1] == NULL) 442 fatal("out of memory\n"); 443 for (i = 1;; i++) { 444 p = tibuf[0] + maxlen * (i % lines_per_buf); 445 if (i % lines_per_buf == 0) /* new block */ 446 if (write(tifd, tibuf[0], tibuflen) != 447 (ssize_t) tibuflen) 448 pfatal("can't write temp file"); 449 if (fgets(p, maxlen + 1, ifp) == NULL) { 450 input_lines = i - 1; 451 if (i % lines_per_buf != 0) 452 if (write(tifd, tibuf[0], tibuflen) != 453 (ssize_t) tibuflen) 454 pfatal("can't write temp file"); 455 break; 456 } 457 j = strlen(p); 458 /* These are '\n' terminated strings, so no need to add a NUL */ 459 if (j == 0 || p[j - 1] != '\n') 460 p[j] = '\n'; 461 } 462 fclose(ifp); 463 close(tifd); 464 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 465 pfatal("can't reopen file %s", TMPINNAME); 466 } 467 468 /* 469 * Fetch a line from the input file, \n terminated, not necessarily \0. 470 */ 471 char * 472 ifetch(LINENUM line, int whichbuf) 473 { 474 if (line < 1 || line > input_lines) { 475 if (warn_on_invalid_line) { 476 say("No such line %ld in input file, ignoring\n", line); 477 warn_on_invalid_line = false; 478 } 479 return NULL; 480 } 481 if (using_plan_a) 482 return i_ptr[line]; 483 else { 484 LINENUM offline = line % lines_per_buf; 485 LINENUM baseline = line - offline; 486 487 if (tiline[0] == baseline) 488 whichbuf = 0; 489 else if (tiline[1] == baseline) 490 whichbuf = 1; 491 else { 492 tiline[whichbuf] = baseline; 493 494 if (lseek(tifd, (off_t) (baseline / lines_per_buf * 495 tibuflen), SEEK_SET) < 0) 496 pfatal("cannot seek in the temporary input file"); 497 498 if (read(tifd, tibuf[whichbuf], tibuflen) != 499 (ssize_t) tibuflen) 500 pfatal("error reading tmp file %s", TMPINNAME); 501 } 502 return tibuf[whichbuf] + (tireclen * offline); 503 } 504 } 505 506 /* 507 * True if the string argument contains the revision number we want. 508 */ 509 static bool 510 rev_in_string(const char *string) 511 { 512 const char *s; 513 size_t patlen; 514 515 if (revision == NULL) 516 return true; 517 patlen = strlen(revision); 518 if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen])) 519 return true; 520 for (s = string; *s; s++) { 521 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) && 522 isspace((unsigned char)s[patlen + 1])) { 523 return true; 524 } 525 } 526 return false; 527 } 528