1 /* $OpenBSD: inp.c,v 1.43 2015/02/05 12:59:57 millert Exp $ */ 2 3 /* 4 * patch - a program to apply diffs to original files 5 * 6 * Copyright 1986, Larry Wall 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following condition is met: 10 * 1. Redistributions of source code must retain the above copyright notice, 11 * this condition and the following disclaimer. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 17 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 26 * behaviour 27 */ 28 29 #include <sys/types.h> 30 #include <sys/file.h> 31 #include <sys/stat.h> 32 #include <sys/mman.h> 33 34 #include <ctype.h> 35 #include <libgen.h> 36 #include <stddef.h> 37 #include <stdint.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #include "common.h" 44 #include "util.h" 45 #include "pch.h" 46 #include "inp.h" 47 48 49 /* Input-file-with-indexable-lines abstract type */ 50 51 static off_t i_size; /* size of the input file */ 52 static char *i_womp; /* plan a buffer for entire file */ 53 static char **i_ptr; /* pointers to lines in i_womp */ 54 55 static int tifd = -1; /* plan b virtual string array */ 56 static char *tibuf[2]; /* plan b buffers */ 57 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ 58 static size_t lines_per_buf; /* how many lines per buffer */ 59 static size_t tibuflen; /* plan b buffer length */ 60 static size_t tireclen; /* length of records in tmp file */ 61 62 static bool rev_in_string(const char *); 63 static bool reallocate_lines(size_t *); 64 65 /* returns false if insufficient memory */ 66 static bool plan_a(const char *); 67 68 static void plan_b(const char *); 69 70 /* New patch--prepare to edit another file. */ 71 72 void 73 re_input(void) 74 { 75 if (using_plan_a) { 76 free(i_ptr); 77 i_ptr = NULL; 78 if (i_womp != NULL) { 79 munmap(i_womp, i_size); 80 i_womp = NULL; 81 } 82 i_size = 0; 83 } else { 84 using_plan_a = true; /* maybe the next one is smaller */ 85 close(tifd); 86 tifd = -1; 87 free(tibuf[0]); 88 free(tibuf[1]); 89 tibuf[0] = tibuf[1] = NULL; 90 tiline[0] = tiline[1] = -1; 91 tireclen = 0; 92 } 93 } 94 95 /* Construct the line index, somehow or other. */ 96 97 void 98 scan_input(const char *filename) 99 { 100 if (!plan_a(filename)) 101 plan_b(filename); 102 if (verbose) { 103 say("Patching file %s using Plan %s...\n", filename, 104 (using_plan_a ? "A" : "B")); 105 } 106 } 107 108 static bool 109 reallocate_lines(size_t *lines_allocated) 110 { 111 char **p; 112 size_t new_size; 113 114 new_size = *lines_allocated * 3 / 2; 115 p = reallocarray(i_ptr, new_size + 2, sizeof(char *)); 116 if (p == NULL) { /* shucks, it was a near thing */ 117 munmap(i_womp, i_size); 118 i_womp = NULL; 119 free(i_ptr); 120 i_ptr = NULL; 121 *lines_allocated = 0; 122 return false; 123 } 124 *lines_allocated = new_size; 125 i_ptr = p; 126 return true; 127 } 128 129 /* Try keeping everything in memory. */ 130 131 static bool 132 plan_a(const char *filename) 133 { 134 int ifd, statfailed; 135 char *p, *s, lbuf[MAXLINELEN]; 136 struct stat filestat; 137 off_t i; 138 ptrdiff_t sz; 139 size_t iline, lines_allocated; 140 141 #ifdef DEBUGGING 142 if (debug & 8) 143 return false; 144 #endif 145 146 if (filename == NULL || *filename == '\0') 147 return false; 148 149 statfailed = stat(filename, &filestat); 150 if (statfailed && ok_to_create_file) { 151 if (verbose) 152 say("(Creating file %s...)\n", filename); 153 154 /* 155 * in check_patch case, we still display `Creating file' even 156 * though we're not. The rule is that -C should be as similar 157 * to normal patch behavior as possible 158 */ 159 if (check_only) 160 return true; 161 makedirs(filename, true); 162 close(creat(filename, 0666)); 163 statfailed = stat(filename, &filestat); 164 } 165 if (statfailed && check_only) 166 fatal("%s not found, -C mode, can't probe further\n", filename); 167 /* For nonexistent or read-only files, look for RCS versions. */ 168 if (statfailed || 169 /* No one can write to it. */ 170 (filestat.st_mode & 0222) == 0 || 171 /* I can't write to it. */ 172 ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { 173 char *cs = NULL, *filebase, *filedir; 174 struct stat cstat; 175 176 filebase = basename(filename); 177 filedir = dirname(filename); 178 179 /* Leave room in lbuf for the diff command. */ 180 s = lbuf + 20; 181 182 #define try(f, a1, a2, a3) \ 183 (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0) 184 185 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 186 try("%s/RCS/%s%s", filedir, filebase, "") || 187 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 188 snprintf(buf, sizeof buf, CHECKOUT, filename); 189 snprintf(lbuf, sizeof lbuf, RCSDIFF, filename); 190 cs = "RCS"; 191 } else if (statfailed) 192 fatal("can't find %s\n", filename); 193 /* 194 * else we can't write to it but it's not under a version 195 * control system, so just proceed. 196 */ 197 if (cs) { 198 if (!statfailed) { 199 if ((filestat.st_mode & 0222) != 0) 200 /* The owner can write to it. */ 201 fatal("file %s seems to be locked " 202 "by somebody else under %s\n", 203 filename, cs); 204 /* 205 * It might be checked out unlocked. See if 206 * it's safe to check out the default version 207 * locked. 208 */ 209 if (verbose) 210 say("Comparing file %s to default " 211 "%s version...\n", 212 filename, cs); 213 if (system(lbuf)) 214 fatal("can't check out file %s: " 215 "differs from default %s version\n", 216 filename, cs); 217 } 218 if (verbose) 219 say("Checking out file %s from %s...\n", 220 filename, cs); 221 if (system(buf) || stat(filename, &filestat)) 222 fatal("can't check out file %s from %s\n", 223 filename, cs); 224 } 225 } 226 filemode = filestat.st_mode; 227 if (!S_ISREG(filemode)) 228 fatal("%s is not a normal file--can't patch\n", filename); 229 i_size = filestat.st_size; 230 if (out_of_mem) { 231 set_hunkmax(); /* make sure dynamic arrays are allocated */ 232 out_of_mem = false; 233 return false; /* force plan b because plan a bombed */ 234 } 235 if (i_size > SIZE_MAX) { 236 say("block too large to mmap\n"); 237 return false; 238 } 239 if ((ifd = open(filename, O_RDONLY)) < 0) 240 pfatal("can't open file %s", filename); 241 242 if (i_size) { 243 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 244 if (i_womp == MAP_FAILED) { 245 perror("mmap failed"); 246 i_womp = NULL; 247 close(ifd); 248 return false; 249 } 250 } else { 251 i_womp = NULL; 252 } 253 254 close(ifd); 255 if (i_size) 256 madvise(i_womp, i_size, MADV_SEQUENTIAL); 257 258 /* estimate the number of lines */ 259 lines_allocated = i_size / 25; 260 if (lines_allocated < 100) 261 lines_allocated = 100; 262 263 if (!reallocate_lines(&lines_allocated)) 264 return false; 265 266 /* now scan the buffer and build pointer array */ 267 iline = 1; 268 i_ptr[iline] = i_womp; 269 /* test for NUL too, to maintain the behavior of the original code */ 270 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 271 if (*s == '\n') { 272 if (iline == lines_allocated) { 273 if (!reallocate_lines(&lines_allocated)) 274 return false; 275 } 276 /* these are NOT NUL terminated */ 277 i_ptr[++iline] = s + 1; 278 } 279 } 280 /* if the last line contains no EOL, append one */ 281 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 282 last_line_missing_eol = true; 283 /* fix last line */ 284 sz = s - i_ptr[iline]; 285 p = malloc(sz + 1); 286 if (p == NULL) { 287 free(i_ptr); 288 i_ptr = NULL; 289 munmap(i_womp, i_size); 290 i_womp = NULL; 291 return false; 292 } 293 294 memcpy(p, i_ptr[iline], sz); 295 p[sz] = '\n'; 296 i_ptr[iline] = p; 297 /* count the extra line and make it point to some valid mem */ 298 i_ptr[++iline] = ""; 299 } else 300 last_line_missing_eol = false; 301 302 input_lines = iline - 1; 303 304 /* now check for revision, if any */ 305 306 if (revision != NULL) { 307 if (i_womp == NULL || !rev_in_string(i_womp)) { 308 if (force) { 309 if (verbose) 310 say("Warning: this file doesn't appear " 311 "to be the %s version--patching anyway.\n", 312 revision); 313 } else if (batch) { 314 fatal("this file doesn't appear to be the " 315 "%s version--aborting.\n", 316 revision); 317 } else { 318 ask("This file doesn't appear to be the " 319 "%s version--patch anyway? [n] ", 320 revision); 321 if (*buf != 'y') 322 fatal("aborted\n"); 323 } 324 } else if (verbose) 325 say("Good. This file appears to be the %s version.\n", 326 revision); 327 } 328 return true; /* plan a will work */ 329 } 330 331 /* Keep (virtually) nothing in memory. */ 332 333 static void 334 plan_b(const char *filename) 335 { 336 FILE *ifp; 337 size_t i = 0, j, len, maxlen = 1; 338 char *lbuf = NULL, *p; 339 bool found_revision = (revision == NULL); 340 341 using_plan_a = false; 342 if ((ifp = fopen(filename, "r")) == NULL) 343 pfatal("can't open file %s", filename); 344 (void) unlink(TMPINNAME); 345 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 346 pfatal("can't open file %s", TMPINNAME); 347 while ((p = fgetln(ifp, &len)) != NULL) { 348 if (p[len - 1] == '\n') 349 p[len - 1] = '\0'; 350 else { 351 /* EOF without EOL, copy and add the NUL */ 352 if ((lbuf = malloc(len + 1)) == NULL) 353 fatal("out of memory\n"); 354 memcpy(lbuf, p, len); 355 lbuf[len] = '\0'; 356 p = lbuf; 357 358 last_line_missing_eol = true; 359 len++; 360 } 361 if (revision != NULL && !found_revision && rev_in_string(p)) 362 found_revision = true; 363 if (len > maxlen) 364 maxlen = len; /* find longest line */ 365 } 366 free(lbuf); 367 if (ferror(ifp)) 368 pfatal("can't read file %s", filename); 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 tireclen = maxlen; 394 tibuflen = maxlen > BUFFERSIZE ? maxlen : BUFFERSIZE; 395 lines_per_buf = tibuflen / maxlen; 396 tibuf[0] = malloc(tibuflen + 1); 397 if (tibuf[0] == NULL) 398 fatal("out of memory\n"); 399 tibuf[1] = malloc(tibuflen + 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], tibuflen) != 406 (ssize_t) tibuflen) 407 pfatal("can't write temp file"); 408 if (fgets(p, maxlen + 1, ifp) == NULL) { 409 input_lines = i - 1; 410 if (i % lines_per_buf != 0) 411 if (write(tifd, tibuf[0], tibuflen) != 412 (ssize_t) tibuflen) 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 tibuflen), SEEK_SET) < 0) 455 pfatal("cannot seek in the temporary input file"); 456 457 if (read(tifd, tibuf[whichbuf], tibuflen) 458 != (ssize_t) tibuflen) 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) && 478 isspace((unsigned char)string[patlen])) 479 return true; 480 for (s = string; *s; s++) { 481 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) && 482 isspace((unsigned char)s[patlen + 1])) { 483 return true; 484 } 485 } 486 return false; 487 } 488