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 1.3 2004/12/26 15:55:23 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 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; 179 180 filebase = basename(filename); 181 filedir = dirname(filename); 182 183 /* Leave room in lbuf for the diff command. */ 184 s = lbuf + 20; 185 186 #define try(f, a1, a2, a3) \ 187 (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0) 188 189 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 190 try("%s/RCS/%s%s", filedir, filebase, "") || 191 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 192 snprintf(buf, sizeof buf, CHECKOUT, filename); 193 snprintf(lbuf, sizeof lbuf, RCSDIFF, filename); 194 cs = "RCS"; 195 } else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) || 196 try("%s/%s%s", filedir, SCCSPREFIX, filebase)) { 197 snprintf(buf, sizeof buf, GET, s); 198 snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename); 199 cs = "SCCS"; 200 } else if (statfailed) 201 fatal("can't find %s\n", filename); 202 /* 203 * else we can't write to it but it's not under a version 204 * control system, so just proceed. 205 */ 206 if (cs) { 207 if (!statfailed) { 208 if ((filestat.st_mode & 0222) != 0) 209 /* The owner can write to it. */ 210 fatal("file %s seems to be locked " 211 "by somebody else under %s\n", 212 filename, cs); 213 /* 214 * It might be checked out unlocked. See if 215 * it's safe to check out the default version 216 * locked. 217 */ 218 if (verbose) 219 say("Comparing file %s to default " 220 "%s version...\n", 221 filename, cs); 222 if (system(lbuf)) 223 fatal("can't check out file %s: " 224 "differs from default %s version\n", 225 filename, cs); 226 } 227 if (verbose) 228 say("Checking out file %s from %s...\n", 229 filename, cs); 230 if (system(buf) || stat(filename, &filestat)) 231 fatal("can't check out file %s from %s\n", 232 filename, cs); 233 } 234 } 235 filemode = filestat.st_mode; 236 if (!S_ISREG(filemode)) 237 fatal("%s is not a normal file--can't patch\n", filename); 238 i_size = filestat.st_size; 239 if (out_of_mem) { 240 set_hunkmax(); /* make sure dynamic arrays are allocated */ 241 out_of_mem = false; 242 return false; /* force plan b because plan a bombed */ 243 } 244 if (i_size > SIZE_MAX) { 245 say("block too large to mmap\n"); 246 return false; 247 } 248 if ((ifd = open(filename, O_RDONLY)) < 0) 249 pfatal("can't open file %s", filename); 250 251 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 252 if (i_womp == MAP_FAILED) { 253 perror("mmap failed"); 254 i_womp = NULL; 255 close(ifd); 256 return false; 257 } 258 259 close(ifd); 260 if (i_size) 261 madvise(i_womp, i_size, MADV_SEQUENTIAL); 262 263 /* estimate the number of lines */ 264 lines_allocated = i_size / 25; 265 if (lines_allocated < 100) 266 lines_allocated = 100; 267 268 if (!reallocate_lines(&lines_allocated)) 269 return false; 270 271 /* now scan the buffer and build pointer array */ 272 iline = 1; 273 i_ptr[iline] = i_womp; 274 /* test for NUL too, to maintain the behavior of the original code */ 275 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 276 if (*s == '\n') { 277 if (iline == (LINENUM)lines_allocated) { 278 if (!reallocate_lines(&lines_allocated)) 279 return false; 280 } 281 /* these are NOT NUL terminated */ 282 i_ptr[++iline] = s + 1; 283 } 284 } 285 /* if the last line contains no EOL, append one */ 286 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 287 last_line_missing_eol = true; 288 /* fix last line */ 289 sz = s - i_ptr[iline]; 290 p = malloc(sz + 1); 291 if (p == NULL) { 292 free(i_ptr); 293 i_ptr = NULL; 294 munmap(i_womp, i_size); 295 i_womp = NULL; 296 return false; 297 } 298 299 memcpy(p, i_ptr[iline], sz); 300 p[sz] = '\n'; 301 i_ptr[iline] = p; 302 /* count the extra line and make it point to some valid mem */ 303 i_ptr[++iline] = empty_line; 304 } else 305 last_line_missing_eol = false; 306 307 input_lines = iline - 1; 308 309 /* now check for revision, if any */ 310 311 if (revision != NULL) { 312 if (!rev_in_string(i_womp)) { 313 if (force) { 314 if (verbose) 315 say("Warning: this file doesn't appear " 316 "to be the %s version--patching anyway.\n", 317 revision); 318 } else if (batch) { 319 fatal("this file doesn't appear to be the " 320 "%s version--aborting.\n", 321 revision); 322 } else { 323 ask("This file doesn't appear to be the " 324 "%s version--patch anyway? [n] ", 325 revision); 326 if (*buf != 'y') 327 fatal("aborted\n"); 328 } 329 } else if (verbose) 330 say("Good. This file appears to be the %s version.\n", 331 revision); 332 } 333 return true; /* plan a will work */ 334 } 335 336 /* Keep (virtually) nothing in memory. */ 337 338 static void 339 plan_b(const char *filename) 340 { 341 FILE *ifp; 342 int i = 0, j, maxlen = 1; 343 char *p; 344 bool found_revision = (revision == NULL); 345 346 using_plan_a = false; 347 if ((ifp = fopen(filename, "r")) == NULL) 348 pfatal("can't open file %s", filename); 349 unlink(TMPINNAME); 350 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 351 pfatal("can't open file %s", TMPINNAME); 352 while (fgets(buf, sizeof buf, ifp) != NULL) { 353 if (revision != NULL && !found_revision && rev_in_string(buf)) 354 found_revision = true; 355 if ((i = strlen(buf)) > maxlen) 356 maxlen = i; /* find longest line */ 357 } 358 last_line_missing_eol = i > 0 && buf[i - 1] != '\n'; 359 if (last_line_missing_eol && maxlen == i) 360 maxlen++; 361 362 if (revision != NULL) { 363 if (!found_revision) { 364 if (force) { 365 if (verbose) 366 say("Warning: this file doesn't appear " 367 "to be the %s version--patching anyway.\n", 368 revision); 369 } else if (batch) { 370 fatal("this file doesn't appear to be the " 371 "%s version--aborting.\n", 372 revision); 373 } else { 374 ask("This file doesn't appear to be the %s " 375 "version--patch anyway? [n] ", 376 revision); 377 if (*buf != 'y') 378 fatal("aborted\n"); 379 } 380 } else if (verbose) 381 say("Good. This file appears to be the %s version.\n", 382 revision); 383 } 384 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 385 lines_per_buf = BUFFERSIZE / maxlen; 386 tireclen = maxlen; 387 tibuf[0] = malloc(BUFFERSIZE + 1); 388 if (tibuf[0] == NULL) 389 fatal("out of memory\n"); 390 tibuf[1] = malloc(BUFFERSIZE + 1); 391 if (tibuf[1] == NULL) 392 fatal("out of memory\n"); 393 for (i = 1;; i++) { 394 p = tibuf[0] + maxlen * (i % lines_per_buf); 395 if (i % lines_per_buf == 0) /* new block */ 396 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 397 pfatal("can't write temp file"); 398 if (fgets(p, maxlen + 1, ifp) == NULL) { 399 input_lines = i - 1; 400 if (i % lines_per_buf != 0) 401 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 402 pfatal("can't write temp file"); 403 break; 404 } 405 j = strlen(p); 406 /* These are '\n' terminated strings, so no need to add a NUL */ 407 if (j == 0 || p[j - 1] != '\n') 408 p[j] = '\n'; 409 } 410 fclose(ifp); 411 close(tifd); 412 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 413 pfatal("can't reopen file %s", TMPINNAME); 414 } 415 416 /* 417 * Fetch a line from the input file, \n terminated, not necessarily \0. 418 */ 419 char * 420 ifetch(LINENUM line, int whichbuf) 421 { 422 if (line < 1 || line > input_lines) { 423 if (warn_on_invalid_line) { 424 say("No such line %ld in input file, ignoring\n", line); 425 warn_on_invalid_line = false; 426 } 427 return NULL; 428 } 429 if (using_plan_a) 430 return i_ptr[line]; 431 else { 432 LINENUM offline = line % lines_per_buf; 433 LINENUM baseline = line - offline; 434 435 if (tiline[0] == baseline) 436 whichbuf = 0; 437 else if (tiline[1] == baseline) 438 whichbuf = 1; 439 else { 440 tiline[whichbuf] = baseline; 441 442 lseek(tifd, (off_t) (baseline / lines_per_buf * 443 BUFFERSIZE), SEEK_SET); 444 445 if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) 446 pfatal("error reading tmp file %s", TMPINNAME); 447 } 448 return tibuf[whichbuf] + (tireclen * offline); 449 } 450 } 451 452 /* 453 * True if the string argument contains the revision number we want. 454 */ 455 static bool 456 rev_in_string(const char *string) 457 { 458 const char *s; 459 int patlen; 460 461 if (revision == NULL) 462 return true; 463 patlen = strlen(revision); 464 if (strnEQ(string, revision, patlen) && isspace(string[patlen])) 465 return true; 466 for (s = string; *s; s++) { 467 if (isspace(*s) && strnEQ(s + 1, revision, patlen) && 468 isspace(s[patlen + 1])) { 469 return true; 470 } 471 } 472 return false; 473 } 474