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 35 #include <ctype.h> 36 #include <libgen.h> 37 #include <limits.h> 38 #include <stddef.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include "common.h" 45 #include "util.h" 46 #include "pch.h" 47 #include "inp.h" 48 49 50 /* Input-file-with-indexable-lines abstract type */ 51 52 static size_t i_size; /* size of the input file */ 53 static char *i_womp; /* plan a buffer for entire file */ 54 static char **i_ptr; /* pointers to lines in i_womp */ 55 static char empty_line[] = { '\0' }; 56 57 static int tifd = -1; /* plan b virtual string array */ 58 static char *tibuf[2]; /* plan b buffers */ 59 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ 60 static LINENUM lines_per_buf; /* how many lines per buffer */ 61 static int tireclen; /* length of records in tmp file */ 62 63 static bool rev_in_string(const char *); 64 static bool reallocate_lines(size_t *); 65 66 /* returns false if insufficient memory */ 67 static bool plan_a(const char *); 68 69 static void plan_b(const char *); 70 71 /* New patch--prepare to edit another file. */ 72 73 void 74 re_input(void) 75 { 76 if (using_plan_a) { 77 free(i_ptr); 78 i_ptr = NULL; 79 if (i_womp != NULL) { 80 munmap(i_womp, i_size); 81 i_womp = NULL; 82 } 83 i_size = 0; 84 } else { 85 using_plan_a = true; /* maybe the next one is smaller */ 86 close(tifd); 87 tifd = -1; 88 free(tibuf[0]); 89 free(tibuf[1]); 90 tibuf[0] = tibuf[1] = NULL; 91 tiline[0] = tiline[1] = -1; 92 tireclen = 0; 93 } 94 } 95 96 /* Construct the line index, somehow or other. */ 97 98 void 99 scan_input(const char *filename) 100 { 101 if (!plan_a(filename)) 102 plan_b(filename); 103 if (verbose) { 104 say("Patching file %s using Plan %s...\n", filename, 105 (using_plan_a ? "A" : "B")); 106 } 107 } 108 109 static bool 110 reallocate_lines(size_t *lines_allocated) 111 { 112 char **p; 113 size_t new_size; 114 115 new_size = *lines_allocated * 3 / 2; 116 p = realloc(i_ptr, (new_size + 2) * sizeof(char *)); 117 if (p == NULL) { /* shucks, it was a near thing */ 118 munmap(i_womp, i_size); 119 i_womp = NULL; 120 free(i_ptr); 121 i_ptr = NULL; 122 *lines_allocated = 0; 123 return false; 124 } 125 *lines_allocated = new_size; 126 i_ptr = p; 127 return true; 128 } 129 130 /* Try keeping everything in memory. */ 131 132 static bool 133 plan_a(const char *filename) 134 { 135 int ifd, statfailed; 136 char *p, *s, lbuf[INITLINELEN]; 137 struct stat filestat; 138 ptrdiff_t sz; 139 size_t i; 140 size_t iline, lines_allocated; 141 142 #ifdef DEBUGGING 143 if (debug & 8) 144 return false; 145 #endif 146 147 if (filename == NULL || *filename == '\0') 148 return false; 149 150 statfailed = stat(filename, &filestat); 151 if (statfailed && ok_to_create_file) { 152 if (verbose) 153 say("(Creating file %s...)\n", filename); 154 155 /* 156 * in check_patch case, we still display `Creating file' even 157 * though we're not. The rule is that -C should be as similar 158 * to normal patch behavior as possible 159 */ 160 if (check_only) 161 return true; 162 makedirs(filename, true); 163 close(creat(filename, 0666)); 164 statfailed = stat(filename, &filestat); 165 } 166 if (statfailed && check_only) 167 fatal("%s not found, -C mode, can't probe further\n", filename); 168 /* For nonexistent or read-only files, look for RCS or SCCS versions. */ 169 if (statfailed || 170 /* No one can write to it. */ 171 (filestat.st_mode & 0222) == 0 || 172 /* I can't write to it. */ 173 ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { 174 const char *cs = NULL, *filebase, *filedir; 175 struct stat cstat; 176 char *tmp_filename1, *tmp_filename2; 177 178 tmp_filename1 = strdup(filename); 179 tmp_filename2 = strdup(filename); 180 if (tmp_filename1 == NULL || tmp_filename2 == NULL) 181 fatal("strdupping filename"); 182 filebase = basename(tmp_filename1); 183 filedir = dirname(tmp_filename2); 184 185 /* Leave room in lbuf for the diff command. */ 186 s = lbuf + 20; 187 188 #define try(f, a1, a2, a3) \ 189 (snprintf(s, buf_size - 20, f, a1, a2, a3), stat(s, &cstat) == 0) 190 191 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 192 try("%s/RCS/%s%s", filedir, filebase, "") || 193 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 194 snprintf(buf, buf_size, CHECKOUT, filename); 195 snprintf(lbuf, sizeof lbuf, RCSDIFF, filename); 196 cs = "RCS"; 197 } else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) || 198 try("%s/%s%s", filedir, SCCSPREFIX, filebase)) { 199 snprintf(buf, buf_size, GET, s); 200 snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename); 201 cs = "SCCS"; 202 } else if (statfailed) 203 fatal("can't find %s\n", filename); 204 205 free(tmp_filename1); 206 free(tmp_filename2); 207 208 /* 209 * else we can't write to it but it's not under a version 210 * control system, so just proceed. 211 */ 212 if (cs) { 213 if (!statfailed) { 214 if ((filestat.st_mode & 0222) != 0) 215 /* The owner can write to it. */ 216 fatal("file %s seems to be locked " 217 "by somebody else under %s\n", 218 filename, cs); 219 /* 220 * It might be checked out unlocked. See if 221 * it's safe to check out the default version 222 * locked. 223 */ 224 if (verbose) 225 say("Comparing file %s to default " 226 "%s version...\n", 227 filename, cs); 228 if (system(lbuf)) 229 fatal("can't check out file %s: " 230 "differs from default %s version\n", 231 filename, cs); 232 } 233 if (verbose) 234 say("Checking out file %s from %s...\n", 235 filename, cs); 236 if (system(buf) || stat(filename, &filestat)) 237 fatal("can't check out file %s from %s\n", 238 filename, cs); 239 } 240 } 241 filemode = filestat.st_mode; 242 if (!S_ISREG(filemode)) 243 fatal("%s is not a normal file--can't patch\n", filename); 244 if ((uint64_t)filestat.st_size > SIZE_MAX) { 245 say("block too large to mmap\n"); 246 return false; 247 } 248 i_size = (size_t)filestat.st_size; 249 if (out_of_mem) { 250 set_hunkmax(); /* make sure dynamic arrays are allocated */ 251 out_of_mem = false; 252 return false; /* force plan b because plan a bombed */ 253 } 254 if ((ifd = open(filename, O_RDONLY)) < 0) 255 pfatal("can't open file %s", filename); 256 257 if (i_size) { 258 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 259 if (i_womp == MAP_FAILED) { 260 perror("mmap failed"); 261 i_womp = NULL; 262 close(ifd); 263 return false; 264 } 265 } else { 266 i_womp = NULL; 267 } 268 269 close(ifd); 270 if (i_size) 271 madvise(i_womp, i_size, MADV_SEQUENTIAL); 272 273 /* estimate the number of lines */ 274 lines_allocated = i_size / 25; 275 if (lines_allocated < 100) 276 lines_allocated = 100; 277 278 if (!reallocate_lines(&lines_allocated)) 279 return false; 280 281 /* now scan the buffer and build pointer array */ 282 iline = 1; 283 i_ptr[iline] = i_womp; 284 /* test for NUL too, to maintain the behavior of the original code */ 285 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 286 if (*s == '\n') { 287 if (iline == lines_allocated) { 288 if (!reallocate_lines(&lines_allocated)) 289 return false; 290 } 291 /* these are NOT NUL terminated */ 292 i_ptr[++iline] = s + 1; 293 } 294 } 295 /* if the last line contains no EOL, append one */ 296 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 297 last_line_missing_eol = true; 298 /* fix last line */ 299 sz = s - i_ptr[iline]; 300 p = malloc(sz + 1); 301 if (p == NULL) { 302 free(i_ptr); 303 i_ptr = NULL; 304 munmap(i_womp, i_size); 305 i_womp = NULL; 306 return false; 307 } 308 309 memcpy(p, i_ptr[iline], sz); 310 p[sz] = '\n'; 311 i_ptr[iline] = p; 312 /* count the extra line and make it point to some valid mem */ 313 i_ptr[++iline] = empty_line; 314 } else 315 last_line_missing_eol = false; 316 317 input_lines = iline - 1; 318 319 /* now check for revision, if any */ 320 321 if (revision != NULL) { 322 if (!rev_in_string(i_womp)) { 323 if (force) { 324 if (verbose) 325 say("Warning: this file doesn't appear " 326 "to be the %s version--patching anyway.\n", 327 revision); 328 } else if (batch) { 329 fatal("this file doesn't appear to be the " 330 "%s version--aborting.\n", 331 revision); 332 } else { 333 ask("This file doesn't appear to be the " 334 "%s version--patch anyway? [n] ", 335 revision); 336 if (*buf != 'y') 337 fatal("aborted\n"); 338 } 339 } else if (verbose) 340 say("Good. This file appears to be the %s version.\n", 341 revision); 342 } 343 return true; /* plan a will work */ 344 } 345 346 /* Keep (virtually) nothing in memory. */ 347 348 static void 349 plan_b(const char *filename) 350 { 351 FILE *ifp; 352 size_t i = 0, j, maxlen = 1; 353 char *p; 354 bool found_revision = (revision == NULL); 355 356 using_plan_a = false; 357 if ((ifp = fopen(filename, "r")) == NULL) 358 pfatal("can't open file %s", filename); 359 unlink(TMPINNAME); 360 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 361 pfatal("can't open file %s", TMPINNAME); 362 while (fgets(buf, buf_size, ifp) != NULL) { 363 if (revision != NULL && !found_revision && rev_in_string(buf)) 364 found_revision = true; 365 if ((i = strlen(buf)) > maxlen) 366 maxlen = i; /* find longest line */ 367 } 368 last_line_missing_eol = i > 0 && buf[i - 1] != '\n'; 369 if (last_line_missing_eol && maxlen == i) 370 maxlen++; 371 372 if (revision != NULL) { 373 if (!found_revision) { 374 if (force) { 375 if (verbose) 376 say("Warning: this file doesn't appear " 377 "to be the %s version--patching anyway.\n", 378 revision); 379 } else if (batch) { 380 fatal("this file doesn't appear to be the " 381 "%s version--aborting.\n", 382 revision); 383 } else { 384 ask("This file doesn't appear to be the %s " 385 "version--patch anyway? [n] ", 386 revision); 387 if (*buf != 'y') 388 fatal("aborted\n"); 389 } 390 } else if (verbose) 391 say("Good. This file appears to be the %s version.\n", 392 revision); 393 } 394 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 395 lines_per_buf = BUFFERSIZE / maxlen; 396 tireclen = maxlen; 397 tibuf[0] = malloc(BUFFERSIZE + 1); 398 if (tibuf[0] == NULL) 399 fatal("out of memory\n"); 400 tibuf[1] = malloc(BUFFERSIZE + 1); 401 if (tibuf[1] == NULL) 402 fatal("out of memory\n"); 403 for (i = 1;; i++) { 404 p = tibuf[0] + maxlen * (i % lines_per_buf); 405 if (i % lines_per_buf == 0) /* new block */ 406 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 407 pfatal("can't write temp file"); 408 if (fgets(p, maxlen + 1, ifp) == NULL) { 409 input_lines = i - 1; 410 if (i % lines_per_buf != 0) 411 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 412 pfatal("can't write temp file"); 413 break; 414 } 415 j = strlen(p); 416 /* These are '\n' terminated strings, so no need to add a NUL */ 417 if (j == 0 || p[j - 1] != '\n') 418 p[j] = '\n'; 419 } 420 fclose(ifp); 421 close(tifd); 422 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 423 pfatal("can't reopen file %s", TMPINNAME); 424 } 425 426 /* 427 * Fetch a line from the input file, \n terminated, not necessarily \0. 428 */ 429 char * 430 ifetch(LINENUM line, int whichbuf) 431 { 432 if (line < 1 || line > input_lines) { 433 if (warn_on_invalid_line) { 434 say("No such line %ld in input file, ignoring\n", line); 435 warn_on_invalid_line = false; 436 } 437 return NULL; 438 } 439 if (using_plan_a) 440 return i_ptr[line]; 441 else { 442 LINENUM offline = line % lines_per_buf; 443 LINENUM baseline = line - offline; 444 445 if (tiline[0] == baseline) 446 whichbuf = 0; 447 else if (tiline[1] == baseline) 448 whichbuf = 1; 449 else { 450 tiline[whichbuf] = baseline; 451 452 if (lseek(tifd, (off_t) (baseline / lines_per_buf * 453 BUFFERSIZE), SEEK_SET) < 0) 454 pfatal("cannot seek in the temporary input file"); 455 456 if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) 457 pfatal("error reading tmp file %s", TMPINNAME); 458 } 459 return tibuf[whichbuf] + (tireclen * offline); 460 } 461 } 462 463 /* 464 * True if the string argument contains the revision number we want. 465 */ 466 static bool 467 rev_in_string(const char *string) 468 { 469 const char *s; 470 size_t patlen; 471 472 if (revision == NULL) 473 return true; 474 patlen = strlen(revision); 475 if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen])) 476 return true; 477 for (s = string; *s; s++) { 478 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) && 479 isspace((unsigned char)s[patlen + 1])) { 480 return true; 481 } 482 } 483 return false; 484 } 485