1 /*- 2 * Copyright 1986, Larry Wall 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following condition is met: 6 * 1. Redistributions of source code must retain the above copyright notice, 7 * this condition and the following disclaimer. 8 * 9 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 10 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 11 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 12 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 13 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 14 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 15 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 16 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 17 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 18 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 19 * SUCH DAMAGE. 20 * 21 * patch - a program to apply diffs to original files 22 * 23 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 24 * behaviour 25 * 26 * $OpenBSD: inp.c,v 1.44 2015/07/26 14:32:19 millert Exp $ 27 * $FreeBSD: head/usr.bin/patch/inp.c 327826 2018-01-11 15:01:48Z kevans $ 28 */ 29 30 #include <sys/types.h> 31 #include <sys/stat.h> 32 #include <sys/mman.h> 33 #include <sys/wait.h> 34 35 #include <ctype.h> 36 #include <fcntl.h> 37 #include <errno.h> 38 #include <libgen.h> 39 #include <paths.h> 40 #include <spawn.h> 41 #include <stddef.h> 42 #include <stdint.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 48 #include "common.h" 49 #include "util.h" 50 #include "pch.h" 51 #include "inp.h" 52 53 54 /* Input-file-with-indexable-lines abstract type */ 55 56 static size_t i_size; /* size of the input file */ 57 static char *i_womp; /* plan a buffer for entire file */ 58 static char **i_ptr; /* pointers to lines in i_womp */ 59 static char empty_line[] = { '\0' }; 60 61 static int tifd = -1; /* plan b virtual string array */ 62 static char *tibuf[2]; /* plan b buffers */ 63 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ 64 static size_t lines_per_buf; /* how many lines per buffer */ 65 static size_t tibuflen; /* plan b buffer length */ 66 static size_t tireclen; /* length of records in tmp file */ 67 68 static bool rev_in_string(const char *); 69 static bool reallocate_lines(size_t *); 70 71 /* returns false if insufficient memory */ 72 static bool plan_a(const char *); 73 74 static void plan_b(const char *); 75 76 /* New patch--prepare to edit another file. */ 77 78 void 79 re_input(void) 80 { 81 if (using_plan_a) { 82 free(i_ptr); 83 i_ptr = NULL; 84 if (i_womp != NULL) { 85 munmap(i_womp, i_size); 86 i_womp = NULL; 87 } 88 i_size = 0; 89 } else { 90 using_plan_a = true; /* maybe the next one is smaller */ 91 close(tifd); 92 tifd = -1; 93 free(tibuf[0]); 94 free(tibuf[1]); 95 tibuf[0] = tibuf[1] = NULL; 96 tiline[0] = tiline[1] = -1; 97 tireclen = 0; 98 } 99 } 100 101 /* Construct the line index, somehow or other. */ 102 103 void 104 scan_input(const char *filename) 105 { 106 if (!plan_a(filename)) 107 plan_b(filename); 108 if (verbose) { 109 say("Patching file %s using Plan %s...\n", filename, 110 (using_plan_a ? "A" : "B")); 111 } 112 } 113 114 static bool 115 reallocate_lines(size_t *lines_allocated) 116 { 117 char **p; 118 size_t new_size; 119 120 new_size = *lines_allocated * 3 / 2; 121 p = reallocarray(i_ptr, new_size + 2, sizeof(char *)); 122 if (p == NULL) { /* shucks, it was a near thing */ 123 munmap(i_womp, i_size); 124 i_womp = NULL; 125 free(i_ptr); 126 i_ptr = NULL; 127 *lines_allocated = 0; 128 return false; 129 } 130 *lines_allocated = new_size; 131 i_ptr = p; 132 return true; 133 } 134 135 /* Try keeping everything in memory. */ 136 137 static bool 138 plan_a(const char *filename) 139 { 140 int ifd, statfailed; 141 char *p, *s; 142 struct stat filestat; 143 ptrdiff_t sz; 144 size_t i; 145 size_t iline, lines_allocated; 146 147 #ifdef DEBUGGING 148 if (debug & 8) 149 return false; 150 #endif 151 152 if (filename == NULL || *filename == '\0') 153 return false; 154 155 statfailed = stat(filename, &filestat); 156 if (statfailed && ok_to_create_file) { 157 if (verbose) 158 say("(Creating file %s...)\n", filename); 159 160 /* 161 * in check_patch case, we still display `Creating file' even 162 * though we're not. The rule is that -C should be as similar 163 * to normal patch behavior as possible 164 */ 165 if (check_only) 166 return true; 167 makedirs(filename, true); 168 close(creat(filename, 0666)); 169 statfailed = stat(filename, &filestat); 170 } 171 if (statfailed) 172 fatal("can't find %s\n", filename); 173 filemode = filestat.st_mode; 174 if (!S_ISREG(filemode)) 175 fatal("%s is not a normal file--can't patch\n", filename); 176 if ((uint64_t)filestat.st_size > SIZE_MAX) { 177 say("block too large to mmap\n"); 178 return false; 179 } 180 i_size = (size_t)filestat.st_size; 181 if (out_of_mem) { 182 set_hunkmax(); /* make sure dynamic arrays are allocated */ 183 out_of_mem = false; 184 return false; /* force plan b because plan a bombed */ 185 } 186 if ((ifd = open(filename, O_RDONLY)) < 0) 187 pfatal("can't open file %s", filename); 188 189 if (i_size) { 190 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 191 if (i_womp == MAP_FAILED) { 192 perror("mmap failed"); 193 i_womp = NULL; 194 close(ifd); 195 return false; 196 } 197 } else { 198 i_womp = NULL; 199 } 200 201 close(ifd); 202 if (i_size) 203 madvise(i_womp, i_size, MADV_SEQUENTIAL); 204 205 /* estimate the number of lines */ 206 lines_allocated = i_size / 25; 207 if (lines_allocated < 100) 208 lines_allocated = 100; 209 210 if (!reallocate_lines(&lines_allocated)) 211 return false; 212 213 /* now scan the buffer and build pointer array */ 214 iline = 1; 215 i_ptr[iline] = i_womp; 216 /* 217 * Testing for NUL here actively breaks files that innocently use NUL 218 * for other reasons. mmap(2) succeeded, just scan the whole buffer. 219 */ 220 for (s = i_womp, i = 0; i < i_size; s++, i++) { 221 if (*s == '\n') { 222 if (iline == lines_allocated) { 223 if (!reallocate_lines(&lines_allocated)) 224 return false; 225 } 226 /* these are NOT NUL terminated */ 227 i_ptr[++iline] = s + 1; 228 } 229 } 230 /* if the last line contains no EOL, append one */ 231 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 232 last_line_missing_eol = true; 233 /* fix last line */ 234 sz = s - i_ptr[iline]; 235 p = malloc(sz + 1); 236 if (p == NULL) { 237 free(i_ptr); 238 i_ptr = NULL; 239 munmap(i_womp, i_size); 240 i_womp = NULL; 241 return false; 242 } 243 244 memcpy(p, i_ptr[iline], sz); 245 p[sz] = '\n'; 246 i_ptr[iline] = p; 247 /* count the extra line and make it point to some valid mem */ 248 i_ptr[++iline] = empty_line; 249 } else 250 last_line_missing_eol = false; 251 252 input_lines = iline - 1; 253 254 /* now check for revision, if any */ 255 256 if (revision != NULL) { 257 if (i_womp == NULL || !rev_in_string(i_womp)) { 258 if (force) { 259 if (verbose) 260 say("Warning: this file doesn't appear " 261 "to be the %s version--patching anyway.\n", 262 revision); 263 } else if (batch) { 264 fatal("this file doesn't appear to be the " 265 "%s version--aborting.\n", 266 revision); 267 } else { 268 ask("This file doesn't appear to be the " 269 "%s version--patch anyway? [n] ", 270 revision); 271 if (*buf != 'y') 272 fatal("aborted\n"); 273 } 274 } else if (verbose) 275 say("Good. This file appears to be the %s version.\n", 276 revision); 277 } 278 return true; /* plan a will work */ 279 } 280 281 /* Keep (virtually) nothing in memory. */ 282 283 static void 284 plan_b(const char *filename) 285 { 286 FILE *ifp; 287 size_t i = 0, j, len, maxlen = 1; 288 char *lbuf = NULL, *p; 289 bool found_revision = (revision == NULL); 290 291 using_plan_a = false; 292 if ((ifp = fopen(filename, "r")) == NULL) 293 pfatal("can't open file %s", filename); 294 unlink(TMPINNAME); 295 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 296 pfatal("can't open file %s", TMPINNAME); 297 while ((p = fgetln(ifp, &len)) != NULL) { 298 if (p[len - 1] == '\n') 299 p[len - 1] = '\0'; 300 else { 301 /* EOF without EOL, copy and add the NUL */ 302 if ((lbuf = malloc(len + 1)) == NULL) 303 fatal("out of memory\n"); 304 memcpy(lbuf, p, len); 305 lbuf[len] = '\0'; 306 p = lbuf; 307 308 last_line_missing_eol = true; 309 len++; 310 } 311 if (revision != NULL && !found_revision && rev_in_string(p)) 312 found_revision = true; 313 if (len > maxlen) 314 maxlen = len; /* find longest line */ 315 } 316 free(lbuf); 317 if (ferror(ifp)) 318 pfatal("can't read file %s", filename); 319 320 if (revision != NULL) { 321 if (!found_revision) { 322 if (force) { 323 if (verbose) 324 say("Warning: this file doesn't appear " 325 "to be the %s version--patching anyway.\n", 326 revision); 327 } else if (batch) { 328 fatal("this file doesn't appear to be the " 329 "%s version--aborting.\n", 330 revision); 331 } else { 332 ask("This file doesn't appear to be the %s " 333 "version--patch anyway? [n] ", 334 revision); 335 if (*buf != 'y') 336 fatal("aborted\n"); 337 } 338 } else if (verbose) 339 say("Good. This file appears to be the %s version.\n", 340 revision); 341 } 342 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 343 tireclen = maxlen; 344 tibuflen = maxlen > BUFFERSIZE ? maxlen : BUFFERSIZE; 345 lines_per_buf = tibuflen / maxlen; 346 tibuf[0] = malloc(tibuflen + 1); 347 if (tibuf[0] == NULL) 348 fatal("out of memory\n"); 349 tibuf[1] = malloc(tibuflen + 1); 350 if (tibuf[1] == NULL) 351 fatal("out of memory\n"); 352 for (i = 1;; i++) { 353 p = tibuf[0] + maxlen * (i % lines_per_buf); 354 if (i % lines_per_buf == 0) /* new block */ 355 if (write(tifd, tibuf[0], tibuflen) != 356 (ssize_t) tibuflen) 357 pfatal("can't write temp file"); 358 if (fgets(p, maxlen + 1, ifp) == NULL) { 359 input_lines = i - 1; 360 if (i % lines_per_buf != 0) 361 if (write(tifd, tibuf[0], tibuflen) != 362 (ssize_t) tibuflen) 363 pfatal("can't write temp file"); 364 break; 365 } 366 j = strlen(p); 367 /* These are '\n' terminated strings, so no need to add a NUL */ 368 if (j == 0 || p[j - 1] != '\n') 369 p[j] = '\n'; 370 } 371 fclose(ifp); 372 close(tifd); 373 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 374 pfatal("can't reopen file %s", TMPINNAME); 375 } 376 377 /* 378 * Fetch a line from the input file, \n terminated, not necessarily \0. 379 */ 380 char * 381 ifetch(LINENUM line, int whichbuf) 382 { 383 if (line < 1 || line > input_lines) { 384 if (warn_on_invalid_line) { 385 say("No such line %ld in input file, ignoring\n", line); 386 warn_on_invalid_line = false; 387 } 388 return NULL; 389 } 390 if (using_plan_a) 391 return i_ptr[line]; 392 else { 393 LINENUM offline = line % lines_per_buf; 394 LINENUM baseline = line - offline; 395 396 if (tiline[0] == baseline) 397 whichbuf = 0; 398 else if (tiline[1] == baseline) 399 whichbuf = 1; 400 else { 401 tiline[whichbuf] = baseline; 402 403 if (lseek(tifd, (off_t) (baseline / lines_per_buf * 404 tibuflen), SEEK_SET) < 0) 405 pfatal("cannot seek in the temporary input file"); 406 407 if (read(tifd, tibuf[whichbuf], tibuflen) != 408 (ssize_t) tibuflen) 409 pfatal("error reading tmp file %s", TMPINNAME); 410 } 411 return tibuf[whichbuf] + (tireclen * offline); 412 } 413 } 414 415 /* 416 * True if the string argument contains the revision number we want. 417 */ 418 static bool 419 rev_in_string(const char *string) 420 { 421 const char *s; 422 size_t patlen; 423 424 if (revision == NULL) 425 return true; 426 patlen = strlen(revision); 427 if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen])) 428 return true; 429 for (s = string; *s; s++) { 430 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) && 431 isspace((unsigned char)s[patlen + 1])) { 432 return true; 433 } 434 } 435 return false; 436 } 437