1 /* $OpenBSD: inp.c,v 1.34 2006/03/11 19:41:30 otto 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 #ifndef lint 30 static const char rcsid[] = "$OpenBSD: inp.c,v 1.34 2006/03/11 19:41:30 otto Exp $"; 31 #endif /* not lint */ 32 33 #include <sys/types.h> 34 #include <sys/file.h> 35 #include <sys/stat.h> 36 #include <sys/mman.h> 37 38 #include <ctype.h> 39 #include <libgen.h> 40 #include <limits.h> 41 #include <stddef.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #include "common.h" 48 #include "util.h" 49 #include "pch.h" 50 #include "inp.h" 51 52 53 /* Input-file-with-indexable-lines abstract type */ 54 55 static off_t i_size; /* size of the input file */ 56 static char *i_womp; /* plan a buffer for entire file */ 57 static char **i_ptr; /* pointers to lines in i_womp */ 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 /* 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 off_t i; 141 ptrdiff_t sz; 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 char *cs = NULL, *filebase, *filedir; 177 struct stat cstat; 178 179 filebase = basename(filename); 180 filedir = dirname(filename); 181 182 /* Leave room in lbuf for the diff command. */ 183 s = lbuf + 20; 184 185 #define try(f, a1, a2, a3) \ 186 (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0) 187 188 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 189 try("%s/RCS/%s%s", filedir, filebase, "") || 190 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 191 snprintf(buf, sizeof buf, CHECKOUT, filename); 192 snprintf(lbuf, sizeof lbuf, RCSDIFF, filename); 193 cs = "RCS"; 194 } else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) || 195 try("%s/%s%s", filedir, SCCSPREFIX, filebase)) { 196 snprintf(buf, sizeof buf, GET, s); 197 snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename); 198 cs = "SCCS"; 199 } else if (statfailed) 200 fatal("can't find %s\n", filename); 201 /* 202 * else we can't write to it but it's not under a version 203 * control system, so just proceed. 204 */ 205 if (cs) { 206 if (!statfailed) { 207 if ((filestat.st_mode & 0222) != 0) 208 /* The owner can write to it. */ 209 fatal("file %s seems to be locked " 210 "by somebody else under %s\n", 211 filename, cs); 212 /* 213 * It might be checked out unlocked. See if 214 * it's safe to check out the default version 215 * locked. 216 */ 217 if (verbose) 218 say("Comparing file %s to default " 219 "%s version...\n", 220 filename, cs); 221 if (system(lbuf)) 222 fatal("can't check out file %s: " 223 "differs from default %s version\n", 224 filename, cs); 225 } 226 if (verbose) 227 say("Checking out file %s from %s...\n", 228 filename, cs); 229 if (system(buf) || stat(filename, &filestat)) 230 fatal("can't check out file %s from %s\n", 231 filename, cs); 232 } 233 } 234 filemode = filestat.st_mode; 235 if (!S_ISREG(filemode)) 236 fatal("%s is not a normal file--can't patch\n", filename); 237 i_size = filestat.st_size; 238 if (out_of_mem) { 239 set_hunkmax(); /* make sure dynamic arrays are allocated */ 240 out_of_mem = false; 241 return false; /* force plan b because plan a bombed */ 242 } 243 if (i_size > SIZE_MAX) { 244 say("block too large to mmap\n"); 245 return false; 246 } 247 if ((ifd = open(filename, O_RDONLY)) < 0) 248 pfatal("can't open file %s", filename); 249 250 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 251 if (i_womp == MAP_FAILED) { 252 perror("mmap failed"); 253 i_womp = NULL; 254 close(ifd); 255 return false; 256 } 257 258 close(ifd); 259 if (i_size) 260 madvise(i_womp, i_size, MADV_SEQUENTIAL); 261 262 /* estimate the number of lines */ 263 lines_allocated = i_size / 25; 264 if (lines_allocated < 100) 265 lines_allocated = 100; 266 267 if (!reallocate_lines(&lines_allocated)) 268 return false; 269 270 /* now scan the buffer and build pointer array */ 271 iline = 1; 272 i_ptr[iline] = i_womp; 273 /* test for NUL too, to maintain the behavior of the original code */ 274 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 275 if (*s == '\n') { 276 if (iline == lines_allocated) { 277 if (!reallocate_lines(&lines_allocated)) 278 return false; 279 } 280 /* these are NOT NUL terminated */ 281 i_ptr[++iline] = s + 1; 282 } 283 } 284 /* if the last line contains no EOL, append one */ 285 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 286 last_line_missing_eol = true; 287 /* fix last line */ 288 sz = s - i_ptr[iline]; 289 p = malloc(sz + 1); 290 if (p == NULL) { 291 free(i_ptr); 292 i_ptr = NULL; 293 munmap(i_womp, i_size); 294 i_womp = NULL; 295 return false; 296 } 297 298 memcpy(p, i_ptr[iline], sz); 299 p[sz] = '\n'; 300 i_ptr[iline] = p; 301 /* count the extra line and make it point to some valid mem */ 302 i_ptr[++iline] = ""; 303 } else 304 last_line_missing_eol = false; 305 306 input_lines = iline - 1; 307 308 /* now check for revision, if any */ 309 310 if (revision != NULL) { 311 if (!rev_in_string(i_womp)) { 312 if (force) { 313 if (verbose) 314 say("Warning: this file doesn't appear " 315 "to be the %s version--patching anyway.\n", 316 revision); 317 } else if (batch) { 318 fatal("this file doesn't appear to be the " 319 "%s version--aborting.\n", 320 revision); 321 } else { 322 ask("This file doesn't appear to be the " 323 "%s version--patch anyway? [n] ", 324 revision); 325 if (*buf != 'y') 326 fatal("aborted\n"); 327 } 328 } else if (verbose) 329 say("Good. This file appears to be the %s version.\n", 330 revision); 331 } 332 return true; /* plan a will work */ 333 } 334 335 /* Keep (virtually) nothing in memory. */ 336 337 static void 338 plan_b(const char *filename) 339 { 340 FILE *ifp; 341 size_t i = 0, j, maxlen = 1; 342 char *p; 343 bool found_revision = (revision == NULL); 344 345 using_plan_a = false; 346 if ((ifp = fopen(filename, "r")) == NULL) 347 pfatal("can't open file %s", filename); 348 (void) unlink(TMPINNAME); 349 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 350 pfatal("can't open file %s", TMPINNAME); 351 while (fgets(buf, sizeof buf, ifp) != NULL) { 352 if (revision != NULL && !found_revision && rev_in_string(buf)) 353 found_revision = true; 354 if ((i = strlen(buf)) > maxlen) 355 maxlen = i; /* find longest line */ 356 } 357 last_line_missing_eol = i > 0 && buf[i - 1] != '\n'; 358 if (last_line_missing_eol && maxlen == i) 359 maxlen++; 360 361 if (revision != NULL) { 362 if (!found_revision) { 363 if (force) { 364 if (verbose) 365 say("Warning: this file doesn't appear " 366 "to be the %s version--patching anyway.\n", 367 revision); 368 } else if (batch) { 369 fatal("this file doesn't appear to be the " 370 "%s version--aborting.\n", 371 revision); 372 } else { 373 ask("This file doesn't appear to be the %s " 374 "version--patch anyway? [n] ", 375 revision); 376 if (*buf != 'y') 377 fatal("aborted\n"); 378 } 379 } else if (verbose) 380 say("Good. This file appears to be the %s version.\n", 381 revision); 382 } 383 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 384 lines_per_buf = BUFFERSIZE / maxlen; 385 tireclen = maxlen; 386 tibuf[0] = malloc(BUFFERSIZE + 1); 387 if (tibuf[0] == NULL) 388 fatal("out of memory\n"); 389 tibuf[1] = malloc(BUFFERSIZE + 1); 390 if (tibuf[1] == NULL) 391 fatal("out of memory\n"); 392 for (i = 1;; i++) { 393 p = tibuf[0] + maxlen * (i % lines_per_buf); 394 if (i % lines_per_buf == 0) /* new block */ 395 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 396 pfatal("can't write temp file"); 397 if (fgets(p, maxlen + 1, ifp) == NULL) { 398 input_lines = i - 1; 399 if (i % lines_per_buf != 0) 400 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 401 pfatal("can't write temp file"); 402 break; 403 } 404 j = strlen(p); 405 /* These are '\n' terminated strings, so no need to add a NUL */ 406 if (j == 0 || p[j - 1] != '\n') 407 p[j] = '\n'; 408 } 409 fclose(ifp); 410 close(tifd); 411 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 412 pfatal("can't reopen file %s", TMPINNAME); 413 } 414 415 /* 416 * Fetch a line from the input file, \n terminated, not necessarily \0. 417 */ 418 char * 419 ifetch(LINENUM line, int whichbuf) 420 { 421 if (line < 1 || line > input_lines) { 422 if (warn_on_invalid_line) { 423 say("No such line %ld in input file, ignoring\n", line); 424 warn_on_invalid_line = false; 425 } 426 return NULL; 427 } 428 if (using_plan_a) 429 return i_ptr[line]; 430 else { 431 LINENUM offline = line % lines_per_buf; 432 LINENUM baseline = line - offline; 433 434 if (tiline[0] == baseline) 435 whichbuf = 0; 436 else if (tiline[1] == baseline) 437 whichbuf = 1; 438 else { 439 tiline[whichbuf] = baseline; 440 441 if (lseek(tifd, (off_t) (baseline / lines_per_buf * 442 BUFFERSIZE), SEEK_SET) < 0) 443 pfatal("cannot seek in the temporary input file"); 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 size_t 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