1 /* 2 * $OpenBSD: inp.c,v 1.34 2006/03/11 19:41:30 otto Exp $ 3 * $DragonFly: src/usr.bin/patch/inp.c,v 1.6 2007/09/29 23:11:10 swildner Exp $ 4 * $NetBSD: inp.c,v 1.19 2008/09/19 18:33:34 joerg Exp $ 5 */ 6 7 /* 8 * patch - a program to apply diffs to original files 9 * 10 * Copyright 1986, Larry Wall 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following condition is met: 14 * 1. Redistributions of source code must retain the above copyright notice, 15 * this condition and the following disclaimer. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 30 * behaviour 31 */ 32 33 #include <sys/cdefs.h> 34 __RCSID("$NetBSD: inp.c,v 1.19 2008/09/19 18:33:34 joerg Exp $"); 35 36 #include <sys/types.h> 37 #include <sys/file.h> 38 #include <sys/stat.h> 39 #include <sys/mman.h> 40 41 #include <ctype.h> 42 #include <libgen.h> 43 #include <limits.h> 44 #include <stddef.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #include "common.h" 51 #include "util.h" 52 #include "pch.h" 53 #include "inp.h" 54 55 56 /* Input-file-with-indexable-lines abstract type */ 57 58 static off_t i_size; /* size of the input file */ 59 static char *i_womp; /* plan a buffer for entire file */ 60 static char **i_ptr; /* pointers to lines in i_womp */ 61 static char empty_line[] = { '\0' }; 62 63 static int tifd = -1; /* plan b virtual string array */ 64 static char *tibuf[2]; /* plan b buffers */ 65 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ 66 static LINENUM lines_per_buf; /* how many lines per buffer */ 67 static int tireclen; /* length of records in tmp file */ 68 69 static bool rev_in_string(const char *); 70 static bool reallocate_lines(size_t *); 71 72 /* returns false if insufficient memory */ 73 static bool plan_a(const char *); 74 75 static void plan_b(const char *); 76 77 /* New patch--prepare to edit another file. */ 78 79 void 80 re_input(void) 81 { 82 if (using_plan_a) { 83 i_size = 0; 84 free(i_ptr); 85 i_ptr = NULL; 86 if (i_womp != NULL) { 87 munmap(i_womp, i_size); 88 i_womp = NULL; 89 } 90 } else { 91 using_plan_a = true; /* maybe the next one is smaller */ 92 close(tifd); 93 tifd = -1; 94 free(tibuf[0]); 95 free(tibuf[1]); 96 tibuf[0] = tibuf[1] = NULL; 97 tiline[0] = tiline[1] = -1; 98 tireclen = 0; 99 } 100 } 101 102 /* Construct the line index, somehow or other. */ 103 104 void 105 scan_input(const char *filename) 106 { 107 if (!plan_a(filename)) 108 plan_b(filename); 109 if (verbose) { 110 say("Patching file %s using Plan %s...\n", filename, 111 (using_plan_a ? "A" : "B")); 112 } 113 } 114 115 static bool 116 reallocate_lines(size_t *lines_allocated) 117 { 118 char **p; 119 size_t new_size; 120 121 new_size = *lines_allocated * 3 / 2; 122 p = realloc(i_ptr, (new_size + 2) * sizeof(char *)); 123 if (p == NULL) { /* shucks, it was a near thing */ 124 munmap(i_womp, i_size); 125 i_womp = NULL; 126 free(i_ptr); 127 i_ptr = NULL; 128 *lines_allocated = 0; 129 return false; 130 } 131 *lines_allocated = new_size; 132 i_ptr = p; 133 return true; 134 } 135 136 /* Try keeping everything in memory. */ 137 138 static bool 139 plan_a(const char *filename) 140 { 141 int ifd, statfailed; 142 char *p, *s, lbuf[MAXLINELEN]; 143 struct stat filestat; 144 off_t i; 145 ptrdiff_t sz; 146 size_t iline, lines_allocated; 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 or SCCS versions. */ 175 if (statfailed || 176 /* No one can write to it. */ 177 (filestat.st_mode & 0222) == 0 || 178 /* I can't write to it. */ 179 ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { 180 const char *cs = NULL, *filebase, *filedir; 181 struct stat cstat; 182 char *tmp_filename1, *tmp_filename2; 183 184 tmp_filename1 = strdup(filename); 185 tmp_filename2 = strdup(filename); 186 if (tmp_filename1 == NULL || tmp_filename2 == NULL) 187 fatal("strdupping filename"); 188 filebase = basename(tmp_filename1); 189 filedir = dirname(tmp_filename2); 190 191 /* Leave room in lbuf for the diff command. */ 192 s = lbuf + 20; 193 194 #define try(f, a1, a2, a3) \ 195 (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0) 196 197 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 198 try("%s/RCS/%s%s", filedir, filebase, "") || 199 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 200 snprintf(buf, buf_len, CHECKOUT, filename); 201 snprintf(lbuf, sizeof lbuf, RCSDIFF, filename); 202 cs = "RCS"; 203 } else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) || 204 try("%s/%s%s", filedir, SCCSPREFIX, filebase)) { 205 snprintf(buf, buf_len, GET, s); 206 snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename); 207 cs = "SCCS"; 208 } else if (statfailed) 209 fatal("can't find %s\n", filename); 210 211 free(tmp_filename1); 212 free(tmp_filename2); 213 214 /* 215 * else we can't write to it but it's not under a version 216 * control system, so just proceed. 217 */ 218 if (cs) { 219 if (!statfailed) { 220 if ((filestat.st_mode & 0222) != 0) 221 /* The owner can write to it. */ 222 fatal("file %s seems to be locked " 223 "by somebody else under %s\n", 224 filename, cs); 225 /* 226 * It might be checked out unlocked. See if 227 * it's safe to check out the default version 228 * locked. 229 */ 230 if (verbose) 231 say("Comparing file %s to default " 232 "%s version...\n", 233 filename, cs); 234 if (system(lbuf)) 235 fatal("can't check out file %s: " 236 "differs from default %s version\n", 237 filename, cs); 238 } 239 if (verbose) 240 say("Checking out file %s from %s...\n", 241 filename, cs); 242 if (system(buf) || stat(filename, &filestat)) 243 fatal("can't check out file %s from %s\n", 244 filename, cs); 245 } 246 } 247 filemode = filestat.st_mode; 248 if (!S_ISREG(filemode)) 249 fatal("%s is not a normal file--can't patch\n", filename); 250 i_size = filestat.st_size; 251 if (out_of_mem) { 252 set_hunkmax(); /* make sure dynamic arrays are allocated */ 253 out_of_mem = false; 254 return false; /* force plan b because plan a bombed */ 255 } 256 if (i_size > SIZE_MAX) { 257 say("block too large to mmap\n"); 258 return false; 259 } 260 if ((ifd = open(filename, O_RDONLY)) < 0) 261 pfatal("can't open file %s", filename); 262 263 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 264 if (i_womp == MAP_FAILED) { 265 perror("mmap failed"); 266 i_womp = NULL; 267 close(ifd); 268 return false; 269 } 270 271 close(ifd); 272 if (i_size) 273 madvise(i_womp, i_size, MADV_SEQUENTIAL); 274 275 /* estimate the number of lines */ 276 lines_allocated = i_size / 25; 277 if (lines_allocated < 100) 278 lines_allocated = 100; 279 280 if (!reallocate_lines(&lines_allocated)) 281 return false; 282 283 /* now scan the buffer and build pointer array */ 284 iline = 1; 285 i_ptr[iline] = i_womp; 286 /* test for NUL too, to maintain the behavior of the original code */ 287 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 288 if (*s == '\n') { 289 if (iline == lines_allocated) { 290 if (!reallocate_lines(&lines_allocated)) 291 return false; 292 } 293 /* these are NOT NUL terminated */ 294 i_ptr[++iline] = s + 1; 295 } 296 } 297 /* if the last line contains no EOL, append one */ 298 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 299 last_line_missing_eol = true; 300 /* fix last line */ 301 sz = s - i_ptr[iline]; 302 p = malloc(sz + 1); 303 if (p == NULL) { 304 free(i_ptr); 305 i_ptr = NULL; 306 munmap(i_womp, i_size); 307 i_womp = NULL; 308 return false; 309 } 310 311 memcpy(p, i_ptr[iline], sz); 312 p[sz] = '\n'; 313 i_ptr[iline] = p; 314 /* count the extra line and make it point to some valid mem */ 315 i_ptr[++iline] = empty_line; 316 } else 317 last_line_missing_eol = false; 318 319 input_lines = iline - 1; 320 321 /* now check for revision, if any */ 322 323 if (revision != NULL) { 324 if (!rev_in_string(i_womp)) { 325 if (force) { 326 if (verbose) 327 say("Warning: this file doesn't appear " 328 "to be the %s version--patching anyway.\n", 329 revision); 330 } else if (batch) { 331 fatal("this file doesn't appear to be the " 332 "%s version--aborting.\n", 333 revision); 334 } else { 335 ask("This file doesn't appear to be the " 336 "%s version--patch anyway? [n] ", 337 revision); 338 if (*buf != 'y') 339 fatal("aborted\n"); 340 } 341 } else if (verbose) 342 say("Good. This file appears to be the %s version.\n", 343 revision); 344 } 345 return true; /* plan a will work */ 346 } 347 348 /* Keep (virtually) nothing in memory. */ 349 350 static void 351 plan_b(const char *filename) 352 { 353 FILE *ifp; 354 size_t i = 0, j, maxlen = 1; 355 char *p; 356 bool found_revision = (revision == NULL); 357 358 using_plan_a = false; 359 if ((ifp = fopen(filename, "r")) == NULL) 360 pfatal("can't open file %s", filename); 361 unlink(TMPINNAME); 362 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 363 pfatal("can't open file %s", TMPINNAME); 364 while (fgets(buf, buf_len, ifp) != NULL) { 365 if (revision != NULL && !found_revision && rev_in_string(buf)) 366 found_revision = true; 367 if ((i = strlen(buf)) > maxlen) 368 maxlen = i; /* find longest line */ 369 } 370 last_line_missing_eol = i > 0 && buf[i - 1] != '\n'; 371 if (last_line_missing_eol && maxlen == i) 372 maxlen++; 373 374 if (revision != NULL) { 375 if (!found_revision) { 376 if (force) { 377 if (verbose) 378 say("Warning: this file doesn't appear " 379 "to be the %s version--patching anyway.\n", 380 revision); 381 } else if (batch) { 382 fatal("this file doesn't appear to be the " 383 "%s version--aborting.\n", 384 revision); 385 } else { 386 ask("This file doesn't appear to be the %s " 387 "version--patch anyway? [n] ", 388 revision); 389 if (*buf != 'y') 390 fatal("aborted\n"); 391 } 392 } else if (verbose) 393 say("Good. This file appears to be the %s version.\n", 394 revision); 395 } 396 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 397 lines_per_buf = BUFFERSIZE / maxlen; 398 tireclen = maxlen; 399 tibuf[0] = malloc(BUFFERSIZE + 1); 400 if (tibuf[0] == NULL) 401 fatal("out of memory\n"); 402 tibuf[1] = malloc(BUFFERSIZE + 1); 403 if (tibuf[1] == NULL) 404 fatal("out of memory\n"); 405 for (i = 1;; i++) { 406 p = tibuf[0] + maxlen * (i % lines_per_buf); 407 if (i % lines_per_buf == 0) /* new block */ 408 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 409 pfatal("can't write temp file"); 410 if (fgets(p, maxlen + 1, ifp) == NULL) { 411 input_lines = i - 1; 412 if (i % lines_per_buf != 0) 413 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 414 pfatal("can't write temp file"); 415 break; 416 } 417 j = strlen(p); 418 /* These are '\n' terminated strings, so no need to add a NUL */ 419 if (j == 0 || p[j - 1] != '\n') 420 p[j] = '\n'; 421 } 422 fclose(ifp); 423 close(tifd); 424 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 425 pfatal("can't reopen file %s", TMPINNAME); 426 } 427 428 /* 429 * Fetch a line from the input file, \n terminated, not necessarily \0. 430 */ 431 char * 432 ifetch(LINENUM line, int whichbuf) 433 { 434 if (line < 1 || line > input_lines) { 435 if (warn_on_invalid_line) { 436 say("No such line %ld in input file, ignoring\n", line); 437 warn_on_invalid_line = false; 438 } 439 return NULL; 440 } 441 if (using_plan_a) 442 return i_ptr[line]; 443 else { 444 LINENUM offline = line % lines_per_buf; 445 LINENUM baseline = line - offline; 446 447 if (tiline[0] == baseline) 448 whichbuf = 0; 449 else if (tiline[1] == baseline) 450 whichbuf = 1; 451 else { 452 tiline[whichbuf] = baseline; 453 454 if (lseek(tifd, (off_t) (baseline / lines_per_buf * 455 BUFFERSIZE), SEEK_SET) < 0) 456 pfatal("cannot seek in the temporary input file"); 457 458 if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) 459 pfatal("error reading tmp file %s", TMPINNAME); 460 } 461 return tibuf[whichbuf] + (tireclen * offline); 462 } 463 } 464 465 /* 466 * True if the string argument contains the revision number we want. 467 */ 468 static bool 469 rev_in_string(const char *string) 470 { 471 const char *s; 472 size_t patlen; 473 474 if (revision == NULL) 475 return true; 476 patlen = strlen(revision); 477 if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen])) 478 return true; 479 for (s = string; *s; s++) { 480 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) && 481 isspace((unsigned char)s[patlen + 1])) { 482 return true; 483 } 484 } 485 return false; 486 } 487