1 /* 2 * $OpenBSD: inp.c,v 1.32 2004/08/05 21:47:24 deraadt Exp $ 3 * $DragonFly: src/usr.bin/patch/inp.c,v 1.5 2006/04/18 22:11:35 joerg Exp $ 4 */ 5 6 /* 7 * patch - a program to apply diffs to original files 8 * 9 * Copyright 1986, Larry Wall 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following condition is met: 13 * 1. Redistributions of source code must retain the above copyright notice, 14 * this condition and the following disclaimer. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 29 * behaviour 30 */ 31 32 #include <sys/types.h> 33 #include <sys/file.h> 34 #include <sys/stat.h> 35 #include <sys/mman.h> 36 37 #include <ctype.h> 38 #include <libgen.h> 39 #include <limits.h> 40 #include <stddef.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 #include "common.h" 47 #include "util.h" 48 #include "pch.h" 49 #include "inp.h" 50 51 52 /* Input-file-with-indexable-lines abstract type */ 53 54 static off_t i_size; /* size of the input file */ 55 static char *i_womp; /* plan a buffer for entire file */ 56 static char **i_ptr; /* pointers to lines in i_womp */ 57 static char empty_line[] = { '\0' }; 58 59 static int tifd = -1; /* plan b virtual string array */ 60 static char *tibuf[2]; /* plan b buffers */ 61 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ 62 static LINENUM lines_per_buf; /* how many lines per buffer */ 63 static int tireclen; /* length of records in tmp file */ 64 65 static bool rev_in_string(const char *); 66 static bool reallocate_lines(size_t *); 67 68 /* returns false if insufficient memory */ 69 static bool plan_a(const char *); 70 71 static void plan_b(const char *); 72 73 /* New patch--prepare to edit another file. */ 74 75 void 76 re_input(void) 77 { 78 if (using_plan_a) { 79 i_size = 0; 80 free(i_ptr); 81 i_ptr = NULL; 82 if (i_womp != NULL) { 83 munmap(i_womp, i_size); 84 i_womp = NULL; 85 } 86 } else { 87 using_plan_a = true; /* maybe the next one is smaller */ 88 close(tifd); 89 tifd = -1; 90 free(tibuf[0]); 91 free(tibuf[1]); 92 tibuf[0] = tibuf[1] = NULL; 93 tiline[0] = tiline[1] = -1; 94 tireclen = 0; 95 } 96 } 97 98 /* Constuct the line index, somehow or other. */ 99 100 void 101 scan_input(const char *filename) 102 { 103 if (!plan_a(filename)) 104 plan_b(filename); 105 if (verbose) { 106 say("Patching file %s using Plan %s...\n", filename, 107 (using_plan_a ? "A" : "B")); 108 } 109 } 110 111 static bool 112 reallocate_lines(size_t *lines_allocated) 113 { 114 char **p; 115 size_t new_size; 116 117 new_size = *lines_allocated * 3 / 2; 118 p = realloc(i_ptr, (new_size + 2) * sizeof(char *)); 119 if (p == NULL) { /* shucks, it was a near thing */ 120 munmap(i_womp, i_size); 121 i_womp = NULL; 122 free(i_ptr); 123 i_ptr = NULL; 124 *lines_allocated = 0; 125 return false; 126 } 127 *lines_allocated = new_size; 128 i_ptr = p; 129 return true; 130 } 131 132 /* Try keeping everything in memory. */ 133 134 static bool 135 plan_a(const char *filename) 136 { 137 int ifd, statfailed; 138 char *p, *s, lbuf[MAXLINELEN]; 139 LINENUM iline; 140 struct stat filestat; 141 off_t i; 142 ptrdiff_t sz; 143 size_t lines_allocated; 144 145 #ifdef DEBUGGING 146 if (debug & 8) 147 return false; 148 #endif 149 150 if (filename == NULL || *filename == '\0') 151 return false; 152 153 statfailed = stat(filename, &filestat); 154 if (statfailed && ok_to_create_file) { 155 if (verbose) 156 say("(Creating file %s...)\n", filename); 157 158 /* 159 * in check_patch case, we still display `Creating file' even 160 * though we're not. The rule is that -C should be as similar 161 * to normal patch behavior as possible 162 */ 163 if (check_only) 164 return true; 165 makedirs(filename, true); 166 close(creat(filename, 0666)); 167 statfailed = stat(filename, &filestat); 168 } 169 if (statfailed && check_only) 170 fatal("%s not found, -C mode, can't probe further\n", filename); 171 /* For nonexistent or read-only files, look for RCS or SCCS versions. */ 172 if (statfailed || 173 /* No one can write to it. */ 174 (filestat.st_mode & 0222) == 0 || 175 /* I can't write to it. */ 176 ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { 177 const char *cs = NULL, *filebase, *filedir; 178 struct stat cstat; 179 char *tmp_filename1, *tmp_filename2; 180 181 tmp_filename1 = strdup(filename); 182 tmp_filename2 = strdup(filename); 183 if (tmp_filename1 == NULL || tmp_filename2 == NULL) 184 fatal("strdupping filename"); 185 filebase = basename(tmp_filename1); 186 filedir = dirname(tmp_filename2); 187 188 /* Leave room in lbuf for the diff command. */ 189 s = lbuf + 20; 190 191 #define try(f, a1, a2, a3) \ 192 (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0) 193 194 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 195 try("%s/RCS/%s%s", filedir, filebase, "") || 196 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 197 snprintf(buf, buf_len, CHECKOUT, filename); 198 snprintf(lbuf, sizeof lbuf, RCSDIFF, filename); 199 cs = "RCS"; 200 } else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) || 201 try("%s/%s%s", filedir, SCCSPREFIX, filebase)) { 202 snprintf(buf, buf_len, GET, s); 203 snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename); 204 cs = "SCCS"; 205 } else if (statfailed) 206 fatal("can't find %s\n", filename); 207 208 free(tmp_filename1); 209 free(tmp_filename2); 210 211 /* 212 * else we can't write to it but it's not under a version 213 * control system, so just proceed. 214 */ 215 if (cs) { 216 if (!statfailed) { 217 if ((filestat.st_mode & 0222) != 0) 218 /* The owner can write to it. */ 219 fatal("file %s seems to be locked " 220 "by somebody else under %s\n", 221 filename, cs); 222 /* 223 * It might be checked out unlocked. See if 224 * it's safe to check out the default version 225 * locked. 226 */ 227 if (verbose) 228 say("Comparing file %s to default " 229 "%s version...\n", 230 filename, cs); 231 if (system(lbuf)) 232 fatal("can't check out file %s: " 233 "differs from default %s version\n", 234 filename, cs); 235 } 236 if (verbose) 237 say("Checking out file %s from %s...\n", 238 filename, cs); 239 if (system(buf) || stat(filename, &filestat)) 240 fatal("can't check out file %s from %s\n", 241 filename, cs); 242 } 243 } 244 filemode = filestat.st_mode; 245 if (!S_ISREG(filemode)) 246 fatal("%s is not a normal file--can't patch\n", filename); 247 i_size = filestat.st_size; 248 if (out_of_mem) { 249 set_hunkmax(); /* make sure dynamic arrays are allocated */ 250 out_of_mem = false; 251 return false; /* force plan b because plan a bombed */ 252 } 253 if (i_size > SIZE_MAX) { 254 say("block too large to mmap\n"); 255 return false; 256 } 257 if ((ifd = open(filename, O_RDONLY)) < 0) 258 pfatal("can't open file %s", filename); 259 260 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 261 if (i_womp == MAP_FAILED) { 262 perror("mmap failed"); 263 i_womp = NULL; 264 close(ifd); 265 return false; 266 } 267 268 close(ifd); 269 if (i_size) 270 madvise(i_womp, i_size, MADV_SEQUENTIAL); 271 272 /* estimate the number of lines */ 273 lines_allocated = i_size / 25; 274 if (lines_allocated < 100) 275 lines_allocated = 100; 276 277 if (!reallocate_lines(&lines_allocated)) 278 return false; 279 280 /* now scan the buffer and build pointer array */ 281 iline = 1; 282 i_ptr[iline] = i_womp; 283 /* test for NUL too, to maintain the behavior of the original code */ 284 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 285 if (*s == '\n') { 286 if (iline == (LINENUM)lines_allocated) { 287 if (!reallocate_lines(&lines_allocated)) 288 return false; 289 } 290 /* these are NOT NUL terminated */ 291 i_ptr[++iline] = s + 1; 292 } 293 } 294 /* if the last line contains no EOL, append one */ 295 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 296 last_line_missing_eol = true; 297 /* fix last line */ 298 sz = s - i_ptr[iline]; 299 p = malloc(sz + 1); 300 if (p == NULL) { 301 free(i_ptr); 302 i_ptr = NULL; 303 munmap(i_womp, i_size); 304 i_womp = NULL; 305 return false; 306 } 307 308 memcpy(p, i_ptr[iline], sz); 309 p[sz] = '\n'; 310 i_ptr[iline] = p; 311 /* count the extra line and make it point to some valid mem */ 312 i_ptr[++iline] = empty_line; 313 } else 314 last_line_missing_eol = false; 315 316 input_lines = iline - 1; 317 318 /* now check for revision, if any */ 319 320 if (revision != NULL) { 321 if (!rev_in_string(i_womp)) { 322 if (force) { 323 if (verbose) 324 say("Warning: this file doesn't appear " 325 "to be the %s version--patching anyway.\n", 326 revision); 327 } else if (batch) { 328 fatal("this file doesn't appear to be the " 329 "%s version--aborting.\n", 330 revision); 331 } else { 332 ask("This file doesn't appear to be the " 333 "%s version--patch anyway? [n] ", 334 revision); 335 if (*buf != 'y') 336 fatal("aborted\n"); 337 } 338 } else if (verbose) 339 say("Good. This file appears to be the %s version.\n", 340 revision); 341 } 342 return true; /* plan a will work */ 343 } 344 345 /* Keep (virtually) nothing in memory. */ 346 347 static void 348 plan_b(const char *filename) 349 { 350 FILE *ifp; 351 int i = 0, j, maxlen = 1; 352 char *p; 353 bool found_revision = (revision == NULL); 354 355 using_plan_a = false; 356 if ((ifp = fopen(filename, "r")) == NULL) 357 pfatal("can't open file %s", filename); 358 unlink(TMPINNAME); 359 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 360 pfatal("can't open file %s", TMPINNAME); 361 while (fgets(buf, buf_len, ifp) != NULL) { 362 if (revision != NULL && !found_revision && rev_in_string(buf)) 363 found_revision = true; 364 if ((i = strlen(buf)) > maxlen) 365 maxlen = i; /* find longest line */ 366 } 367 last_line_missing_eol = i > 0 && buf[i - 1] != '\n'; 368 if (last_line_missing_eol && maxlen == i) 369 maxlen++; 370 371 if (revision != NULL) { 372 if (!found_revision) { 373 if (force) { 374 if (verbose) 375 say("Warning: this file doesn't appear " 376 "to be the %s version--patching anyway.\n", 377 revision); 378 } else if (batch) { 379 fatal("this file doesn't appear to be the " 380 "%s version--aborting.\n", 381 revision); 382 } else { 383 ask("This file doesn't appear to be the %s " 384 "version--patch anyway? [n] ", 385 revision); 386 if (*buf != 'y') 387 fatal("aborted\n"); 388 } 389 } else if (verbose) 390 say("Good. This file appears to be the %s version.\n", 391 revision); 392 } 393 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 394 lines_per_buf = BUFFERSIZE / maxlen; 395 tireclen = maxlen; 396 tibuf[0] = malloc(BUFFERSIZE + 1); 397 if (tibuf[0] == NULL) 398 fatal("out of memory\n"); 399 tibuf[1] = malloc(BUFFERSIZE + 1); 400 if (tibuf[1] == NULL) 401 fatal("out of memory\n"); 402 for (i = 1;; i++) { 403 p = tibuf[0] + maxlen * (i % lines_per_buf); 404 if (i % lines_per_buf == 0) /* new block */ 405 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 406 pfatal("can't write temp file"); 407 if (fgets(p, maxlen + 1, ifp) == NULL) { 408 input_lines = i - 1; 409 if (i % lines_per_buf != 0) 410 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 411 pfatal("can't write temp file"); 412 break; 413 } 414 j = strlen(p); 415 /* These are '\n' terminated strings, so no need to add a NUL */ 416 if (j == 0 || p[j - 1] != '\n') 417 p[j] = '\n'; 418 } 419 fclose(ifp); 420 close(tifd); 421 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 422 pfatal("can't reopen file %s", TMPINNAME); 423 } 424 425 /* 426 * Fetch a line from the input file, \n terminated, not necessarily \0. 427 */ 428 char * 429 ifetch(LINENUM line, int whichbuf) 430 { 431 if (line < 1 || line > input_lines) { 432 if (warn_on_invalid_line) { 433 say("No such line %ld in input file, ignoring\n", line); 434 warn_on_invalid_line = false; 435 } 436 return NULL; 437 } 438 if (using_plan_a) 439 return i_ptr[line]; 440 else { 441 LINENUM offline = line % lines_per_buf; 442 LINENUM baseline = line - offline; 443 444 if (tiline[0] == baseline) 445 whichbuf = 0; 446 else if (tiline[1] == baseline) 447 whichbuf = 1; 448 else { 449 tiline[whichbuf] = baseline; 450 451 lseek(tifd, (off_t) (baseline / lines_per_buf * 452 BUFFERSIZE), SEEK_SET); 453 454 if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) 455 pfatal("error reading tmp file %s", TMPINNAME); 456 } 457 return tibuf[whichbuf] + (tireclen * offline); 458 } 459 } 460 461 /* 462 * True if the string argument contains the revision number we want. 463 */ 464 static bool 465 rev_in_string(const char *string) 466 { 467 const char *s; 468 int patlen; 469 470 if (revision == NULL) 471 return true; 472 patlen = strlen(revision); 473 if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen])) 474 return true; 475 for (s = string; *s; s++) { 476 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) && 477 isspace((unsigned char)s[patlen + 1])) { 478 return true; 479 } 480 } 481 return false; 482 } 483