1 /* 2 * $OpenBSD: inp.c,v 1.34 2006/03/11 19:41:30 otto Exp $ 3 */ 4 5 /* 6 * patch - a program to apply diffs to original files 7 * 8 * Copyright 1986, Larry Wall 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following condition is met: 12 * 1. Redistributions of source code must retain the above copyright notice, 13 * this condition and the following disclaimer. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 28 * behaviour 29 */ 30 31 #include <sys/types.h> 32 #include <sys/file.h> 33 #include <sys/stat.h> 34 #include <sys/mman.h> 35 36 #include <ctype.h> 37 #include <libgen.h> 38 #include <limits.h> 39 #include <stddef.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 45 #include "common.h" 46 #include "util.h" 47 #include "pch.h" 48 #include "inp.h" 49 50 51 /* Input-file-with-indexable-lines abstract type */ 52 53 static size_t i_size; /* size of the input file */ 54 static char *i_womp; /* plan a buffer for entire file */ 55 static char **i_ptr; /* pointers to lines in i_womp */ 56 static char empty_line[] = { '\0' }; 57 58 static int tifd = -1; /* plan b virtual string array */ 59 static char *tibuf[2]; /* plan b buffers */ 60 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ 61 static LINENUM lines_per_buf; /* how many lines per buffer */ 62 static int tireclen; /* length of records in tmp file */ 63 64 static bool rev_in_string(const char *); 65 static bool reallocate_lines(size_t *); 66 67 /* returns false if insufficient memory */ 68 static bool plan_a(const char *); 69 70 static void plan_b(const char *); 71 72 /* New patch--prepare to edit another file. */ 73 74 void 75 re_input(void) 76 { 77 if (using_plan_a) { 78 free(i_ptr); 79 i_ptr = NULL; 80 if (i_womp != NULL) { 81 munmap(i_womp, i_size); 82 i_womp = NULL; 83 } 84 i_size = 0; 85 } else { 86 using_plan_a = true; /* maybe the next one is smaller */ 87 close(tifd); 88 tifd = -1; 89 free(tibuf[0]); 90 free(tibuf[1]); 91 tibuf[0] = tibuf[1] = NULL; 92 tiline[0] = tiline[1] = -1; 93 tireclen = 0; 94 } 95 } 96 97 /* Construct the line index, somehow or other. */ 98 99 void 100 scan_input(const char *filename) 101 { 102 if (!plan_a(filename)) 103 plan_b(filename); 104 if (verbose) { 105 say("Patching file %s using Plan %s...\n", filename, 106 (using_plan_a ? "A" : "B")); 107 } 108 } 109 110 static bool 111 reallocate_lines(size_t *lines_allocated) 112 { 113 char **p; 114 size_t new_size; 115 116 new_size = *lines_allocated * 3 / 2; 117 p = realloc(i_ptr, (new_size + 2) * sizeof(char *)); 118 if (p == NULL) { /* shucks, it was a near thing */ 119 munmap(i_womp, i_size); 120 i_womp = NULL; 121 free(i_ptr); 122 i_ptr = NULL; 123 *lines_allocated = 0; 124 return false; 125 } 126 *lines_allocated = new_size; 127 i_ptr = p; 128 return true; 129 } 130 131 /* Try keeping everything in memory. */ 132 133 static bool 134 plan_a(const char *filename) 135 { 136 int ifd, statfailed; 137 char *p, *s, lbuf[MAXLINELEN]; 138 struct stat filestat; 139 ptrdiff_t sz; 140 size_t i; 141 size_t iline, lines_allocated; 142 143 #ifdef DEBUGGING 144 if (debug & 8) 145 return false; 146 #endif 147 148 if (filename == NULL || *filename == '\0') 149 return false; 150 151 statfailed = stat(filename, &filestat); 152 if (statfailed && ok_to_create_file) { 153 if (verbose) 154 say("(Creating file %s...)\n", filename); 155 156 /* 157 * in check_patch case, we still display `Creating file' even 158 * though we're not. The rule is that -C should be as similar 159 * to normal patch behavior as possible 160 */ 161 if (check_only) 162 return true; 163 makedirs(filename, true); 164 close(creat(filename, 0666)); 165 statfailed = stat(filename, &filestat); 166 } 167 if (statfailed && check_only) 168 fatal("%s not found, -C mode, can't probe further\n", filename); 169 /* For nonexistent or read-only files, look for RCS or SCCS versions. */ 170 if (statfailed || 171 /* No one can write to it. */ 172 (filestat.st_mode & 0222) == 0 || 173 /* I can't write to it. */ 174 ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { 175 const char *cs = NULL, *filebase, *filedir; 176 struct stat cstat; 177 char *tmp_filename1, *tmp_filename2; 178 179 tmp_filename1 = strdup(filename); 180 tmp_filename2 = strdup(filename); 181 if (tmp_filename1 == NULL || tmp_filename2 == NULL) 182 fatal("strdupping filename"); 183 filebase = basename(tmp_filename1); 184 filedir = dirname(tmp_filename2); 185 186 /* Leave room in lbuf for the diff command. */ 187 s = lbuf + 20; 188 189 #define try(f, a1, a2, a3) \ 190 (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0) 191 192 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 193 try("%s/RCS/%s%s", filedir, filebase, "") || 194 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 195 snprintf(buf, buf_len, CHECKOUT, filename); 196 snprintf(lbuf, sizeof lbuf, RCSDIFF, filename); 197 cs = "RCS"; 198 } else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) || 199 try("%s/%s%s", filedir, SCCSPREFIX, filebase)) { 200 snprintf(buf, buf_len, GET, s); 201 snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename); 202 cs = "SCCS"; 203 } else if (statfailed) 204 fatal("can't find %s\n", filename); 205 206 free(tmp_filename1); 207 free(tmp_filename2); 208 209 /* 210 * else we can't write to it but it's not under a version 211 * control system, so just proceed. 212 */ 213 if (cs) { 214 if (!statfailed) { 215 if ((filestat.st_mode & 0222) != 0) 216 /* The owner can write to it. */ 217 fatal("file %s seems to be locked " 218 "by somebody else under %s\n", 219 filename, cs); 220 /* 221 * It might be checked out unlocked. See if 222 * it's safe to check out the default version 223 * locked. 224 */ 225 if (verbose) 226 say("Comparing file %s to default " 227 "%s version...\n", 228 filename, cs); 229 if (system(lbuf)) 230 fatal("can't check out file %s: " 231 "differs from default %s version\n", 232 filename, cs); 233 } 234 if (verbose) 235 say("Checking out file %s from %s...\n", 236 filename, cs); 237 if (system(buf) || stat(filename, &filestat)) 238 fatal("can't check out file %s from %s\n", 239 filename, cs); 240 } 241 } 242 filemode = filestat.st_mode; 243 if (!S_ISREG(filemode)) 244 fatal("%s is not a normal file--can't patch\n", filename); 245 if ((uint64_t)filestat.st_size > SIZE_MAX) { 246 say("block too large to mmap\n"); 247 return false; 248 } 249 i_size = (size_t)filestat.st_size; 250 if (out_of_mem) { 251 set_hunkmax(); /* make sure dynamic arrays are allocated */ 252 out_of_mem = false; 253 return false; /* force plan b because plan a bombed */ 254 } 255 if ((ifd = open(filename, O_RDONLY)) < 0) 256 pfatal("can't open file %s", filename); 257 258 if (i_size) { 259 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 260 if (i_womp == MAP_FAILED) { 261 perror("mmap failed"); 262 i_womp = NULL; 263 close(ifd); 264 return false; 265 } 266 } else { 267 i_womp = NULL; 268 } 269 270 close(ifd); 271 if (i_size) 272 madvise(i_womp, i_size, MADV_SEQUENTIAL); 273 274 /* estimate the number of lines */ 275 lines_allocated = i_size / 25; 276 if (lines_allocated < 100) 277 lines_allocated = 100; 278 279 if (!reallocate_lines(&lines_allocated)) 280 return false; 281 282 /* now scan the buffer and build pointer array */ 283 iline = 1; 284 i_ptr[iline] = i_womp; 285 /* test for NUL too, to maintain the behavior of the original code */ 286 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 287 if (*s == '\n') { 288 if (iline == lines_allocated) { 289 if (!reallocate_lines(&lines_allocated)) 290 return false; 291 } 292 /* these are NOT NUL terminated */ 293 i_ptr[++iline] = s + 1; 294 } 295 } 296 /* if the last line contains no EOL, append one */ 297 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 298 last_line_missing_eol = true; 299 /* fix last line */ 300 sz = s - i_ptr[iline]; 301 p = malloc(sz + 1); 302 if (p == NULL) { 303 free(i_ptr); 304 i_ptr = NULL; 305 munmap(i_womp, i_size); 306 i_womp = NULL; 307 return false; 308 } 309 310 memcpy(p, i_ptr[iline], sz); 311 p[sz] = '\n'; 312 i_ptr[iline] = p; 313 /* count the extra line and make it point to some valid mem */ 314 i_ptr[++iline] = empty_line; 315 } else 316 last_line_missing_eol = false; 317 318 input_lines = iline - 1; 319 320 /* now check for revision, if any */ 321 322 if (revision != NULL) { 323 if (!rev_in_string(i_womp)) { 324 if (force) { 325 if (verbose) 326 say("Warning: this file doesn't appear " 327 "to be the %s version--patching anyway.\n", 328 revision); 329 } else if (batch) { 330 fatal("this file doesn't appear to be the " 331 "%s version--aborting.\n", 332 revision); 333 } else { 334 ask("This file doesn't appear to be the " 335 "%s version--patch anyway? [n] ", 336 revision); 337 if (*buf != 'y') 338 fatal("aborted\n"); 339 } 340 } else if (verbose) 341 say("Good. This file appears to be the %s version.\n", 342 revision); 343 } 344 return true; /* plan a will work */ 345 } 346 347 /* Keep (virtually) nothing in memory. */ 348 349 static void 350 plan_b(const char *filename) 351 { 352 FILE *ifp; 353 size_t i = 0, j, maxlen = 1; 354 char *p; 355 bool found_revision = (revision == NULL); 356 357 using_plan_a = false; 358 if ((ifp = fopen(filename, "r")) == NULL) 359 pfatal("can't open file %s", filename); 360 unlink(TMPINNAME); 361 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 362 pfatal("can't open file %s", TMPINNAME); 363 while (fgets(buf, buf_len, ifp) != NULL) { 364 if (revision != NULL && !found_revision && rev_in_string(buf)) 365 found_revision = true; 366 if ((i = strlen(buf)) > maxlen) 367 maxlen = i; /* find longest line */ 368 } 369 last_line_missing_eol = i > 0 && buf[i - 1] != '\n'; 370 if (last_line_missing_eol && maxlen == i) 371 maxlen++; 372 373 if (revision != NULL) { 374 if (!found_revision) { 375 if (force) { 376 if (verbose) 377 say("Warning: this file doesn't appear " 378 "to be the %s version--patching anyway.\n", 379 revision); 380 } else if (batch) { 381 fatal("this file doesn't appear to be the " 382 "%s version--aborting.\n", 383 revision); 384 } else { 385 ask("This file doesn't appear to be the %s " 386 "version--patch anyway? [n] ", 387 revision); 388 if (*buf != 'y') 389 fatal("aborted\n"); 390 } 391 } else if (verbose) 392 say("Good. This file appears to be the %s version.\n", 393 revision); 394 } 395 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 396 lines_per_buf = BUFFERSIZE / maxlen; 397 tireclen = maxlen; 398 tibuf[0] = malloc(BUFFERSIZE + 1); 399 if (tibuf[0] == NULL) 400 fatal("out of memory\n"); 401 tibuf[1] = malloc(BUFFERSIZE + 1); 402 if (tibuf[1] == NULL) 403 fatal("out of memory\n"); 404 for (i = 1;; i++) { 405 p = tibuf[0] + maxlen * (i % lines_per_buf); 406 if (i % lines_per_buf == 0) /* new block */ 407 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 408 pfatal("can't write temp file"); 409 if (fgets(p, maxlen + 1, ifp) == NULL) { 410 input_lines = i - 1; 411 if (i % lines_per_buf != 0) 412 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 413 pfatal("can't write temp file"); 414 break; 415 } 416 j = strlen(p); 417 /* These are '\n' terminated strings, so no need to add a NUL */ 418 if (j == 0 || p[j - 1] != '\n') 419 p[j] = '\n'; 420 } 421 fclose(ifp); 422 close(tifd); 423 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 424 pfatal("can't reopen file %s", TMPINNAME); 425 } 426 427 /* 428 * Fetch a line from the input file, \n terminated, not necessarily \0. 429 */ 430 char * 431 ifetch(LINENUM line, int whichbuf) 432 { 433 if (line < 1 || line > input_lines) { 434 if (warn_on_invalid_line) { 435 say("No such line %ld in input file, ignoring\n", line); 436 warn_on_invalid_line = false; 437 } 438 return NULL; 439 } 440 if (using_plan_a) 441 return i_ptr[line]; 442 else { 443 LINENUM offline = line % lines_per_buf; 444 LINENUM baseline = line - offline; 445 446 if (tiline[0] == baseline) 447 whichbuf = 0; 448 else if (tiline[1] == baseline) 449 whichbuf = 1; 450 else { 451 tiline[whichbuf] = baseline; 452 453 if (lseek(tifd, (off_t) (baseline / lines_per_buf * 454 BUFFERSIZE), SEEK_SET) < 0) 455 pfatal("cannot seek in the temporary input file"); 456 457 if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) 458 pfatal("error reading tmp file %s", TMPINNAME); 459 } 460 return tibuf[whichbuf] + (tireclen * offline); 461 } 462 } 463 464 /* 465 * True if the string argument contains the revision number we want. 466 */ 467 static bool 468 rev_in_string(const char *string) 469 { 470 const char *s; 471 size_t patlen; 472 473 if (revision == NULL) 474 return true; 475 patlen = strlen(revision); 476 if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen])) 477 return true; 478 for (s = string; *s; s++) { 479 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) && 480 isspace((unsigned char)s[patlen + 1])) { 481 return true; 482 } 483 } 484 return false; 485 } 486