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 */ 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 size_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 free(i_ptr); 80 i_ptr = NULL; 81 if (i_womp != NULL) { 82 munmap(i_womp, i_size); 83 i_womp = NULL; 84 } 85 i_size = 0; 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 /* Construct 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 struct stat filestat; 140 ptrdiff_t sz; 141 size_t i; 142 size_t iline, lines_allocated; 143 144 #ifdef DEBUGGING 145 if (debug & 8) 146 return false; 147 #endif 148 149 if (filename == NULL || *filename == '\0') 150 return false; 151 152 statfailed = stat(filename, &filestat); 153 if (statfailed && ok_to_create_file) { 154 if (verbose) 155 say("(Creating file %s...)\n", filename); 156 157 /* 158 * in check_patch case, we still display `Creating file' even 159 * though we're not. The rule is that -C should be as similar 160 * to normal patch behavior as possible 161 */ 162 if (check_only) 163 return true; 164 makedirs(filename, true); 165 close(creat(filename, 0666)); 166 statfailed = stat(filename, &filestat); 167 } 168 if (statfailed && check_only) 169 fatal("%s not found, -C mode, can't probe further\n", filename); 170 /* For nonexistent or read-only files, look for RCS or SCCS versions. */ 171 if (statfailed || 172 /* No one can write to it. */ 173 (filestat.st_mode & 0222) == 0 || 174 /* I can't write to it. */ 175 ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { 176 const char *cs = NULL, *filebase, *filedir; 177 struct stat cstat; 178 char *tmp_filename1, *tmp_filename2; 179 180 tmp_filename1 = strdup(filename); 181 tmp_filename2 = strdup(filename); 182 if (tmp_filename1 == NULL || tmp_filename2 == NULL) 183 fatal("strdupping filename"); 184 filebase = basename(tmp_filename1); 185 filedir = dirname(tmp_filename2); 186 187 /* Leave room in lbuf for the diff command. */ 188 s = lbuf + 20; 189 190 #define try(f, a1, a2, a3) \ 191 (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0) 192 193 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 194 try("%s/RCS/%s%s", filedir, filebase, "") || 195 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 196 snprintf(buf, buf_len, CHECKOUT, filename); 197 snprintf(lbuf, sizeof lbuf, RCSDIFF, filename); 198 cs = "RCS"; 199 } else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) || 200 try("%s/%s%s", filedir, SCCSPREFIX, filebase)) { 201 snprintf(buf, buf_len, GET, s); 202 snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename); 203 cs = "SCCS"; 204 } else if (statfailed) 205 fatal("can't find %s\n", filename); 206 207 free(tmp_filename1); 208 free(tmp_filename2); 209 210 /* 211 * else we can't write to it but it's not under a version 212 * control system, so just proceed. 213 */ 214 if (cs) { 215 if (!statfailed) { 216 if ((filestat.st_mode & 0222) != 0) 217 /* The owner can write to it. */ 218 fatal("file %s seems to be locked " 219 "by somebody else under %s\n", 220 filename, cs); 221 /* 222 * It might be checked out unlocked. See if 223 * it's safe to check out the default version 224 * locked. 225 */ 226 if (verbose) 227 say("Comparing file %s to default " 228 "%s version...\n", 229 filename, cs); 230 if (system(lbuf)) 231 fatal("can't check out file %s: " 232 "differs from default %s version\n", 233 filename, cs); 234 } 235 if (verbose) 236 say("Checking out file %s from %s...\n", 237 filename, cs); 238 if (system(buf) || stat(filename, &filestat)) 239 fatal("can't check out file %s from %s\n", 240 filename, cs); 241 } 242 } 243 filemode = filestat.st_mode; 244 if (!S_ISREG(filemode)) 245 fatal("%s is not a normal file--can't patch\n", filename); 246 if ((uint64_t)filestat.st_size > SIZE_MAX) { 247 say("block too large to mmap\n"); 248 return false; 249 } 250 i_size = (size_t)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 ((ifd = open(filename, O_RDONLY)) < 0) 257 pfatal("can't open file %s", filename); 258 259 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 } 266 267 close(ifd); 268 if (i_size) 269 madvise(i_womp, i_size, MADV_SEQUENTIAL); 270 271 /* estimate the number of lines */ 272 lines_allocated = i_size / 25; 273 if (lines_allocated < 100) 274 lines_allocated = 100; 275 276 if (!reallocate_lines(&lines_allocated)) 277 return false; 278 279 /* now scan the buffer and build pointer array */ 280 iline = 1; 281 i_ptr[iline] = i_womp; 282 /* test for NUL too, to maintain the behavior of the original code */ 283 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 284 if (*s == '\n') { 285 if (iline == lines_allocated) { 286 if (!reallocate_lines(&lines_allocated)) 287 return false; 288 } 289 /* these are NOT NUL terminated */ 290 i_ptr[++iline] = s + 1; 291 } 292 } 293 /* if the last line contains no EOL, append one */ 294 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 295 last_line_missing_eol = true; 296 /* fix last line */ 297 sz = s - i_ptr[iline]; 298 p = malloc(sz + 1); 299 if (p == NULL) { 300 free(i_ptr); 301 i_ptr = NULL; 302 munmap(i_womp, i_size); 303 i_womp = NULL; 304 return false; 305 } 306 307 memcpy(p, i_ptr[iline], sz); 308 p[sz] = '\n'; 309 i_ptr[iline] = p; 310 /* count the extra line and make it point to some valid mem */ 311 i_ptr[++iline] = empty_line; 312 } else 313 last_line_missing_eol = false; 314 315 input_lines = iline - 1; 316 317 /* now check for revision, if any */ 318 319 if (revision != NULL) { 320 if (!rev_in_string(i_womp)) { 321 if (force) { 322 if (verbose) 323 say("Warning: this file doesn't appear " 324 "to be the %s version--patching anyway.\n", 325 revision); 326 } else if (batch) { 327 fatal("this file doesn't appear to be the " 328 "%s version--aborting.\n", 329 revision); 330 } else { 331 ask("This file doesn't appear to be the " 332 "%s version--patch anyway? [n] ", 333 revision); 334 if (*buf != 'y') 335 fatal("aborted\n"); 336 } 337 } else if (verbose) 338 say("Good. This file appears to be the %s version.\n", 339 revision); 340 } 341 return true; /* plan a will work */ 342 } 343 344 /* Keep (virtually) nothing in memory. */ 345 346 static void 347 plan_b(const char *filename) 348 { 349 FILE *ifp; 350 size_t i = 0, j, maxlen = 1; 351 char *p; 352 bool found_revision = (revision == NULL); 353 354 using_plan_a = false; 355 if ((ifp = fopen(filename, "r")) == NULL) 356 pfatal("can't open file %s", filename); 357 unlink(TMPINNAME); 358 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 359 pfatal("can't open file %s", TMPINNAME); 360 while (fgets(buf, buf_len, ifp) != NULL) { 361 if (revision != NULL && !found_revision && rev_in_string(buf)) 362 found_revision = true; 363 if ((i = strlen(buf)) > maxlen) 364 maxlen = i; /* find longest line */ 365 } 366 last_line_missing_eol = i > 0 && buf[i - 1] != '\n'; 367 if (last_line_missing_eol && maxlen == i) 368 maxlen++; 369 370 if (revision != NULL) { 371 if (!found_revision) { 372 if (force) { 373 if (verbose) 374 say("Warning: this file doesn't appear " 375 "to be the %s version--patching anyway.\n", 376 revision); 377 } else if (batch) { 378 fatal("this file doesn't appear to be the " 379 "%s version--aborting.\n", 380 revision); 381 } else { 382 ask("This file doesn't appear to be the %s " 383 "version--patch anyway? [n] ", 384 revision); 385 if (*buf != 'y') 386 fatal("aborted\n"); 387 } 388 } else if (verbose) 389 say("Good. This file appears to be the %s version.\n", 390 revision); 391 } 392 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 393 lines_per_buf = BUFFERSIZE / maxlen; 394 tireclen = maxlen; 395 tibuf[0] = malloc(BUFFERSIZE + 1); 396 if (tibuf[0] == NULL) 397 fatal("out of memory\n"); 398 tibuf[1] = malloc(BUFFERSIZE + 1); 399 if (tibuf[1] == NULL) 400 fatal("out of memory\n"); 401 for (i = 1;; i++) { 402 p = tibuf[0] + maxlen * (i % lines_per_buf); 403 if (i % lines_per_buf == 0) /* new block */ 404 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 405 pfatal("can't write temp file"); 406 if (fgets(p, maxlen + 1, ifp) == NULL) { 407 input_lines = i - 1; 408 if (i % lines_per_buf != 0) 409 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 410 pfatal("can't write temp file"); 411 break; 412 } 413 j = strlen(p); 414 /* These are '\n' terminated strings, so no need to add a NUL */ 415 if (j == 0 || p[j - 1] != '\n') 416 p[j] = '\n'; 417 } 418 fclose(ifp); 419 close(tifd); 420 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 421 pfatal("can't reopen file %s", TMPINNAME); 422 } 423 424 /* 425 * Fetch a line from the input file, \n terminated, not necessarily \0. 426 */ 427 char * 428 ifetch(LINENUM line, int whichbuf) 429 { 430 if (line < 1 || line > input_lines) { 431 if (warn_on_invalid_line) { 432 say("No such line %ld in input file, ignoring\n", line); 433 warn_on_invalid_line = false; 434 } 435 return NULL; 436 } 437 if (using_plan_a) 438 return i_ptr[line]; 439 else { 440 LINENUM offline = line % lines_per_buf; 441 LINENUM baseline = line - offline; 442 443 if (tiline[0] == baseline) 444 whichbuf = 0; 445 else if (tiline[1] == baseline) 446 whichbuf = 1; 447 else { 448 tiline[whichbuf] = baseline; 449 450 if (lseek(tifd, (off_t) (baseline / lines_per_buf * 451 BUFFERSIZE), SEEK_SET) < 0) 452 pfatal("cannot seek in the temporary input file"); 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 size_t 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