1 /* $OpenBSD: inp.c,v 1.41 2014/11/25 10:22:08 tobias 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 <limits.h> 37 #include <stddef.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 LINENUM lines_per_buf; /* how many lines per buffer */ 59 static int tireclen; /* length of records in tmp file */ 60 61 static bool rev_in_string(const char *); 62 static bool reallocate_lines(size_t *); 63 64 /* returns false if insufficient memory */ 65 static bool plan_a(const char *); 66 67 static void plan_b(const char *); 68 69 /* New patch--prepare to edit another file. */ 70 71 void 72 re_input(void) 73 { 74 if (using_plan_a) { 75 free(i_ptr); 76 i_ptr = NULL; 77 if (i_womp != NULL) { 78 munmap(i_womp, i_size); 79 i_womp = NULL; 80 } 81 i_size = 0; 82 } else { 83 using_plan_a = true; /* maybe the next one is smaller */ 84 close(tifd); 85 tifd = -1; 86 free(tibuf[0]); 87 free(tibuf[1]); 88 tibuf[0] = tibuf[1] = NULL; 89 tiline[0] = tiline[1] = -1; 90 tireclen = 0; 91 } 92 } 93 94 /* Construct the line index, somehow or other. */ 95 96 void 97 scan_input(const char *filename) 98 { 99 if (!plan_a(filename)) 100 plan_b(filename); 101 if (verbose) { 102 say("Patching file %s using Plan %s...\n", filename, 103 (using_plan_a ? "A" : "B")); 104 } 105 } 106 107 static bool 108 reallocate_lines(size_t *lines_allocated) 109 { 110 char **p; 111 size_t new_size; 112 113 new_size = *lines_allocated * 3 / 2; 114 p = reallocarray(i_ptr, new_size + 2, sizeof(char *)); 115 if (p == NULL) { /* shucks, it was a near thing */ 116 munmap(i_womp, i_size); 117 i_womp = NULL; 118 free(i_ptr); 119 i_ptr = NULL; 120 *lines_allocated = 0; 121 return false; 122 } 123 *lines_allocated = new_size; 124 i_ptr = p; 125 return true; 126 } 127 128 /* Try keeping everything in memory. */ 129 130 static bool 131 plan_a(const char *filename) 132 { 133 int ifd, statfailed; 134 char *p, *s, lbuf[MAXLINELEN]; 135 struct stat filestat; 136 off_t i; 137 ptrdiff_t sz; 138 size_t iline, lines_allocated; 139 140 #ifdef DEBUGGING 141 if (debug & 8) 142 return false; 143 #endif 144 145 if (filename == NULL || *filename == '\0') 146 return false; 147 148 statfailed = stat(filename, &filestat); 149 if (statfailed && ok_to_create_file) { 150 if (verbose) 151 say("(Creating file %s...)\n", filename); 152 153 /* 154 * in check_patch case, we still display `Creating file' even 155 * though we're not. The rule is that -C should be as similar 156 * to normal patch behavior as possible 157 */ 158 if (check_only) 159 return true; 160 makedirs(filename, true); 161 close(creat(filename, 0666)); 162 statfailed = stat(filename, &filestat); 163 } 164 if (statfailed && check_only) 165 fatal("%s not found, -C mode, can't probe further\n", filename); 166 /* For nonexistent or read-only files, look for RCS versions. */ 167 if (statfailed || 168 /* No one can write to it. */ 169 (filestat.st_mode & 0222) == 0 || 170 /* I can't write to it. */ 171 ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { 172 char *cs = NULL, *filebase, *filedir; 173 struct stat cstat; 174 175 filebase = basename(filename); 176 filedir = dirname(filename); 177 178 /* Leave room in lbuf for the diff command. */ 179 s = lbuf + 20; 180 181 #define try(f, a1, a2, a3) \ 182 (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0) 183 184 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 185 try("%s/RCS/%s%s", filedir, filebase, "") || 186 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 187 snprintf(buf, sizeof buf, CHECKOUT, filename); 188 snprintf(lbuf, sizeof lbuf, RCSDIFF, filename); 189 cs = "RCS"; 190 } else if (statfailed) 191 fatal("can't find %s\n", filename); 192 /* 193 * else we can't write to it but it's not under a version 194 * control system, so just proceed. 195 */ 196 if (cs) { 197 if (!statfailed) { 198 if ((filestat.st_mode & 0222) != 0) 199 /* The owner can write to it. */ 200 fatal("file %s seems to be locked " 201 "by somebody else under %s\n", 202 filename, cs); 203 /* 204 * It might be checked out unlocked. See if 205 * it's safe to check out the default version 206 * locked. 207 */ 208 if (verbose) 209 say("Comparing file %s to default " 210 "%s version...\n", 211 filename, cs); 212 if (system(lbuf)) 213 fatal("can't check out file %s: " 214 "differs from default %s version\n", 215 filename, cs); 216 } 217 if (verbose) 218 say("Checking out file %s from %s...\n", 219 filename, cs); 220 if (system(buf) || stat(filename, &filestat)) 221 fatal("can't check out file %s from %s\n", 222 filename, cs); 223 } 224 } 225 filemode = filestat.st_mode; 226 if (!S_ISREG(filemode)) 227 fatal("%s is not a normal file--can't patch\n", filename); 228 i_size = filestat.st_size; 229 if (out_of_mem) { 230 set_hunkmax(); /* make sure dynamic arrays are allocated */ 231 out_of_mem = false; 232 return false; /* force plan b because plan a bombed */ 233 } 234 if (i_size > SIZE_MAX) { 235 say("block too large to mmap\n"); 236 return false; 237 } 238 if ((ifd = open(filename, O_RDONLY)) < 0) 239 pfatal("can't open file %s", filename); 240 241 if (i_size) { 242 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 243 if (i_womp == MAP_FAILED) { 244 perror("mmap failed"); 245 i_womp = NULL; 246 close(ifd); 247 return false; 248 } 249 } else { 250 i_womp = NULL; 251 } 252 253 close(ifd); 254 if (i_size) 255 madvise(i_womp, i_size, MADV_SEQUENTIAL); 256 257 /* estimate the number of lines */ 258 lines_allocated = i_size / 25; 259 if (lines_allocated < 100) 260 lines_allocated = 100; 261 262 if (!reallocate_lines(&lines_allocated)) 263 return false; 264 265 /* now scan the buffer and build pointer array */ 266 iline = 1; 267 i_ptr[iline] = i_womp; 268 /* test for NUL too, to maintain the behavior of the original code */ 269 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 270 if (*s == '\n') { 271 if (iline == lines_allocated) { 272 if (!reallocate_lines(&lines_allocated)) 273 return false; 274 } 275 /* these are NOT NUL terminated */ 276 i_ptr[++iline] = s + 1; 277 } 278 } 279 /* if the last line contains no EOL, append one */ 280 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 281 last_line_missing_eol = true; 282 /* fix last line */ 283 sz = s - i_ptr[iline]; 284 p = malloc(sz + 1); 285 if (p == NULL) { 286 free(i_ptr); 287 i_ptr = NULL; 288 munmap(i_womp, i_size); 289 i_womp = NULL; 290 return false; 291 } 292 293 memcpy(p, i_ptr[iline], sz); 294 p[sz] = '\n'; 295 i_ptr[iline] = p; 296 /* count the extra line and make it point to some valid mem */ 297 i_ptr[++iline] = ""; 298 } else 299 last_line_missing_eol = false; 300 301 input_lines = iline - 1; 302 303 /* now check for revision, if any */ 304 305 if (revision != NULL) { 306 if (i_womp == NULL || !rev_in_string(i_womp)) { 307 if (force) { 308 if (verbose) 309 say("Warning: this file doesn't appear " 310 "to be the %s version--patching anyway.\n", 311 revision); 312 } else if (batch) { 313 fatal("this file doesn't appear to be the " 314 "%s version--aborting.\n", 315 revision); 316 } else { 317 ask("This file doesn't appear to be the " 318 "%s version--patch anyway? [n] ", 319 revision); 320 if (*buf != 'y') 321 fatal("aborted\n"); 322 } 323 } else if (verbose) 324 say("Good. This file appears to be the %s version.\n", 325 revision); 326 } 327 return true; /* plan a will work */ 328 } 329 330 /* Keep (virtually) nothing in memory. */ 331 332 static void 333 plan_b(const char *filename) 334 { 335 FILE *ifp; 336 size_t i = 0, j, maxlen = 1; 337 char *p; 338 bool found_revision = (revision == NULL); 339 340 using_plan_a = false; 341 if ((ifp = fopen(filename, "r")) == NULL) 342 pfatal("can't open file %s", filename); 343 (void) unlink(TMPINNAME); 344 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 345 pfatal("can't open file %s", TMPINNAME); 346 while (fgets(buf, sizeof buf, ifp) != NULL) { 347 if (revision != NULL && !found_revision && rev_in_string(buf)) 348 found_revision = true; 349 if ((i = strlen(buf)) > maxlen) 350 maxlen = i; /* find longest line */ 351 } 352 last_line_missing_eol = i > 0 && buf[i - 1] != '\n'; 353 if (last_line_missing_eol && maxlen == i) 354 maxlen++; 355 356 if (revision != NULL) { 357 if (!found_revision) { 358 if (force) { 359 if (verbose) 360 say("Warning: this file doesn't appear " 361 "to be the %s version--patching anyway.\n", 362 revision); 363 } else if (batch) { 364 fatal("this file doesn't appear to be the " 365 "%s version--aborting.\n", 366 revision); 367 } else { 368 ask("This file doesn't appear to be the %s " 369 "version--patch anyway? [n] ", 370 revision); 371 if (*buf != 'y') 372 fatal("aborted\n"); 373 } 374 } else if (verbose) 375 say("Good. This file appears to be the %s version.\n", 376 revision); 377 } 378 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 379 lines_per_buf = BUFFERSIZE / maxlen; 380 tireclen = maxlen; 381 tibuf[0] = malloc(BUFFERSIZE + 1); 382 if (tibuf[0] == NULL) 383 fatal("out of memory\n"); 384 tibuf[1] = malloc(BUFFERSIZE + 1); 385 if (tibuf[1] == NULL) 386 fatal("out of memory\n"); 387 for (i = 1;; i++) { 388 p = tibuf[0] + maxlen * (i % lines_per_buf); 389 if (i % lines_per_buf == 0) /* new block */ 390 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 391 pfatal("can't write temp file"); 392 if (fgets(p, maxlen + 1, ifp) == NULL) { 393 input_lines = i - 1; 394 if (i % lines_per_buf != 0) 395 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 396 pfatal("can't write temp file"); 397 break; 398 } 399 j = strlen(p); 400 /* These are '\n' terminated strings, so no need to add a NUL */ 401 if (j == 0 || p[j - 1] != '\n') 402 p[j] = '\n'; 403 } 404 fclose(ifp); 405 close(tifd); 406 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 407 pfatal("can't reopen file %s", TMPINNAME); 408 } 409 410 /* 411 * Fetch a line from the input file, \n terminated, not necessarily \0. 412 */ 413 char * 414 ifetch(LINENUM line, int whichbuf) 415 { 416 if (line < 1 || line > input_lines) { 417 if (warn_on_invalid_line) { 418 say("No such line %ld in input file, ignoring\n", line); 419 warn_on_invalid_line = false; 420 } 421 return NULL; 422 } 423 if (using_plan_a) 424 return i_ptr[line]; 425 else { 426 LINENUM offline = line % lines_per_buf; 427 LINENUM baseline = line - offline; 428 429 if (tiline[0] == baseline) 430 whichbuf = 0; 431 else if (tiline[1] == baseline) 432 whichbuf = 1; 433 else { 434 tiline[whichbuf] = baseline; 435 436 if (lseek(tifd, (off_t) (baseline / lines_per_buf * 437 BUFFERSIZE), SEEK_SET) < 0) 438 pfatal("cannot seek in the temporary input file"); 439 440 if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) 441 pfatal("error reading tmp file %s", TMPINNAME); 442 } 443 return tibuf[whichbuf] + (tireclen * offline); 444 } 445 } 446 447 /* 448 * True if the string argument contains the revision number we want. 449 */ 450 static bool 451 rev_in_string(const char *string) 452 { 453 const char *s; 454 size_t patlen; 455 456 if (revision == NULL) 457 return true; 458 patlen = strlen(revision); 459 if (strnEQ(string, revision, patlen) && 460 isspace((unsigned char)string[patlen])) 461 return true; 462 for (s = string; *s; s++) { 463 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) && 464 isspace((unsigned char)s[patlen + 1])) { 465 return true; 466 } 467 } 468 return false; 469 } 470