1 2 /*- 3 * Copyright 1986, Larry Wall 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following condition is met: 7 * 1. Redistributions of source code must retain the above copyright notice, 8 * this condition and the following disclaimer. 9 * 10 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 11 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 12 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 13 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 14 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 15 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 16 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 17 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 18 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 19 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 20 * SUCH DAMAGE. 21 * 22 * patch - a program to apply diffs to original files 23 * 24 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 25 * behaviour 26 * 27 * $OpenBSD: pch.c,v 1.40 2013/07/11 12:39:31 otto Exp $ 28 * $FreeBSD$ 29 */ 30 31 #include <sys/types.h> 32 #include <sys/stat.h> 33 34 #include <ctype.h> 35 #include <libgen.h> 36 #include <limits.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 #include "common.h" 43 #include "util.h" 44 #include "pch.h" 45 #include "pathnames.h" 46 47 /* Patch (diff listing) abstract type. */ 48 49 static off_t p_filesize; /* size of the patch file */ 50 static LINENUM p_first; /* 1st line number */ 51 static LINENUM p_newfirst; /* 1st line number of replacement */ 52 static LINENUM p_ptrn_lines; /* # lines in pattern */ 53 static LINENUM p_repl_lines; /* # lines in replacement text */ 54 static LINENUM p_end = -1; /* last line in hunk */ 55 static LINENUM p_max; /* max allowed value of p_end */ 56 static LINENUM p_context = 3; /* # of context lines */ 57 static LINENUM p_input_line = 0; /* current line # from patch file */ 58 static char **p_line = NULL;/* the text of the hunk */ 59 static unsigned short *p_len = NULL; /* length of each line */ 60 static char *p_char = NULL; /* +, -, and ! */ 61 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 62 static int p_indent; /* indent to patch */ 63 static off_t p_base; /* where to intuit this time */ 64 static LINENUM p_bline; /* line # of p_base */ 65 static off_t p_start; /* where intuit found a patch */ 66 static LINENUM p_sline; /* and the line number for it */ 67 static LINENUM p_hunk_beg; /* line number of current hunk */ 68 static LINENUM p_efake = -1; /* end of faked up lines--don't free */ 69 static LINENUM p_bfake = -1; /* beg of faked up lines */ 70 static FILE *pfp = NULL; /* patch file pointer */ 71 static char *bestguess = NULL; /* guess at correct filename */ 72 73 static void grow_hunkmax(void); 74 static int intuit_diff_type(void); 75 static void next_intuit_at(off_t, LINENUM); 76 static void skip_to(off_t, LINENUM); 77 static size_t pgets(bool _do_indent); 78 static char *best_name(const struct file_name *, bool); 79 static char *posix_name(const struct file_name *, bool); 80 static size_t num_components(const char *); 81 82 /* 83 * Prepare to look for the next patch in the patch file. 84 */ 85 void 86 re_patch(void) 87 { 88 p_first = 0; 89 p_newfirst = 0; 90 p_ptrn_lines = 0; 91 p_repl_lines = 0; 92 p_end = (LINENUM) - 1; 93 p_max = 0; 94 p_indent = 0; 95 } 96 97 /* 98 * Open the patch file at the beginning of time. 99 */ 100 void 101 open_patch_file(const char *filename) 102 { 103 struct stat filestat; 104 int nr, nw; 105 106 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 107 pfp = fopen(TMPPATNAME, "w"); 108 if (pfp == NULL) 109 pfatal("can't create %s", TMPPATNAME); 110 while ((nr = fread(buf, 1, buf_size, stdin)) > 0) { 111 nw = fwrite(buf, 1, nr, pfp); 112 if (nr != nw) 113 pfatal("write error to %s", TMPPATNAME); 114 } 115 if (ferror(pfp) || fclose(pfp)) 116 pfatal("can't write %s", TMPPATNAME); 117 filename = TMPPATNAME; 118 } 119 pfp = fopen(filename, "r"); 120 if (pfp == NULL) 121 pfatal("patch file %s not found", filename); 122 if (fstat(fileno(pfp), &filestat)) 123 pfatal("can't stat %s", filename); 124 p_filesize = filestat.st_size; 125 next_intuit_at(0, 1L); /* start at the beginning */ 126 set_hunkmax(); 127 } 128 129 /* 130 * Make sure our dynamically realloced tables are malloced to begin with. 131 */ 132 void 133 set_hunkmax(void) 134 { 135 if (p_line == NULL) 136 p_line = malloc(hunkmax * sizeof(char *)); 137 if (p_len == NULL) 138 p_len = malloc(hunkmax * sizeof(unsigned short)); 139 if (p_char == NULL) 140 p_char = malloc(hunkmax * sizeof(char)); 141 } 142 143 /* 144 * Enlarge the arrays containing the current hunk of patch. 145 */ 146 static void 147 grow_hunkmax(void) 148 { 149 int new_hunkmax = hunkmax * 2; 150 151 if (p_line == NULL || p_len == NULL || p_char == NULL) 152 fatal("Internal memory allocation error\n"); 153 154 p_line = reallocf(p_line, new_hunkmax * sizeof(char *)); 155 p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short)); 156 p_char = reallocf(p_char, new_hunkmax * sizeof(char)); 157 158 if (p_line != NULL && p_len != NULL && p_char != NULL) { 159 hunkmax = new_hunkmax; 160 return; 161 } 162 163 if (!using_plan_a) 164 fatal("out of memory\n"); 165 out_of_mem = true; /* whatever is null will be allocated again */ 166 /* from within plan_a(), of all places */ 167 } 168 169 /* True if the remainder of the patch file contains a diff of some sort. */ 170 171 bool 172 there_is_another_patch(void) 173 { 174 bool exists = false; 175 176 if (p_base != 0 && p_base >= p_filesize) { 177 if (verbose) 178 say("done\n"); 179 return false; 180 } 181 if (verbose) 182 say("Hmm..."); 183 diff_type = intuit_diff_type(); 184 if (!diff_type) { 185 if (p_base != 0) { 186 if (verbose) 187 say(" Ignoring the trailing garbage.\ndone\n"); 188 } else 189 say(" I can't seem to find a patch in there anywhere.\n"); 190 return false; 191 } 192 if (verbose) 193 say(" %sooks like %s to me...\n", 194 (p_base == 0 ? "L" : "The next patch l"), 195 diff_type == UNI_DIFF ? "a unified diff" : 196 diff_type == CONTEXT_DIFF ? "a context diff" : 197 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 198 diff_type == NORMAL_DIFF ? "a normal diff" : 199 "an ed script"); 200 if (p_indent && verbose) 201 say("(Patch is indented %d space%s.)\n", p_indent, 202 p_indent == 1 ? "" : "s"); 203 skip_to(p_start, p_sline); 204 while (filearg[0] == NULL) { 205 if (force || batch) { 206 say("No file to patch. Skipping...\n"); 207 filearg[0] = savestr(bestguess); 208 skip_rest_of_patch = true; 209 return true; 210 } 211 ask("File to patch: "); 212 if (*buf != '\n') { 213 free(bestguess); 214 bestguess = savestr(buf); 215 filearg[0] = fetchname(buf, &exists, 0); 216 } 217 if (!exists) { 218 ask("No file found--skip this patch? [n] "); 219 if (*buf != 'y') 220 continue; 221 if (verbose) 222 say("Skipping patch...\n"); 223 free(filearg[0]); 224 filearg[0] = fetchname(bestguess, &exists, 0); 225 skip_rest_of_patch = true; 226 return true; 227 } 228 } 229 return true; 230 } 231 232 static void 233 p4_fetchname(struct file_name *name, char *str) 234 { 235 char *t, *h; 236 237 /* Skip leading whitespace. */ 238 while (isspace((unsigned char)*str)) 239 str++; 240 241 /* Remove the file revision number. */ 242 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 243 if (*t == '#') 244 h = t; 245 if (h != NULL) 246 *h = '\0'; 247 248 name->path = fetchname(str, &name->exists, strippath); 249 } 250 251 /* Determine what kind of diff is in the remaining part of the patch file. */ 252 253 static int 254 intuit_diff_type(void) 255 { 256 off_t this_line = 0, previous_line; 257 off_t first_command_line = -1; 258 LINENUM fcl_line = -1; 259 bool last_line_was_command = false, this_is_a_command = false; 260 bool stars_last_line = false, stars_this_line = false; 261 char *s, *t; 262 int indent, retval; 263 struct file_name names[MAX_FILE]; 264 265 memset(names, 0, sizeof(names)); 266 ok_to_create_file = false; 267 fseeko(pfp, p_base, SEEK_SET); 268 p_input_line = p_bline - 1; 269 for (;;) { 270 previous_line = this_line; 271 last_line_was_command = this_is_a_command; 272 stars_last_line = stars_this_line; 273 this_line = ftello(pfp); 274 indent = 0; 275 p_input_line++; 276 if (pgets(false) == 0) { 277 if (first_command_line >= 0) { 278 /* nothing but deletes!? */ 279 p_start = first_command_line; 280 p_sline = fcl_line; 281 retval = ED_DIFF; 282 goto scan_exit; 283 } else { 284 p_start = this_line; 285 p_sline = p_input_line; 286 retval = 0; 287 goto scan_exit; 288 } 289 } 290 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 291 if (*s == '\t') 292 indent += 8 - (indent % 8); 293 else 294 indent++; 295 } 296 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 297 ; 298 this_is_a_command = (isdigit((unsigned char)*s) && 299 (*t == 'd' || *t == 'c' || *t == 'a')); 300 if (first_command_line < 0 && this_is_a_command) { 301 first_command_line = this_line; 302 fcl_line = p_input_line; 303 p_indent = indent; /* assume this for now */ 304 } 305 if (!stars_last_line && strnEQ(s, "*** ", 4)) 306 names[OLD_FILE].path = fetchname(s + 4, 307 &names[OLD_FILE].exists, strippath); 308 else if (strnEQ(s, "--- ", 4)) 309 names[NEW_FILE].path = fetchname(s + 4, 310 &names[NEW_FILE].exists, strippath); 311 else if (strnEQ(s, "+++ ", 4)) 312 /* pretend it is the old name */ 313 names[OLD_FILE].path = fetchname(s + 4, 314 &names[OLD_FILE].exists, strippath); 315 else if (strnEQ(s, "Index:", 6)) 316 names[INDEX_FILE].path = fetchname(s + 6, 317 &names[INDEX_FILE].exists, strippath); 318 else if (strnEQ(s, "Prereq:", 7)) { 319 for (t = s + 7; isspace((unsigned char)*t); t++) 320 ; 321 revision = savestr(t); 322 for (t = revision; *t && !isspace((unsigned char)*t); t++) 323 ; 324 *t = '\0'; 325 if (*revision == '\0') { 326 free(revision); 327 revision = NULL; 328 } 329 } else if (strnEQ(s, "==== ", 5)) { 330 /* Perforce-style diffs. */ 331 if ((t = strstr(s + 5, " - ")) != NULL) 332 p4_fetchname(&names[NEW_FILE], t + 3); 333 p4_fetchname(&names[OLD_FILE], s + 5); 334 } 335 if ((!diff_type || diff_type == ED_DIFF) && 336 first_command_line >= 0 && 337 strEQ(s, ".\n")) { 338 p_indent = indent; 339 p_start = first_command_line; 340 p_sline = fcl_line; 341 retval = ED_DIFF; 342 goto scan_exit; 343 } 344 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 345 if (strnEQ(s + 4, "0,0", 3)) 346 ok_to_create_file = true; 347 p_indent = indent; 348 p_start = this_line; 349 p_sline = p_input_line; 350 retval = UNI_DIFF; 351 goto scan_exit; 352 } 353 stars_this_line = strnEQ(s, "********", 8); 354 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 355 strnEQ(s, "*** ", 4)) { 356 if (atol(s + 4) == 0) 357 ok_to_create_file = true; 358 /* 359 * If this is a new context diff the character just 360 * at the end of the line is a '*'. 361 */ 362 while (*s && *s != '\n') 363 s++; 364 p_indent = indent; 365 p_start = previous_line; 366 p_sline = p_input_line - 1; 367 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 368 goto scan_exit; 369 } 370 if ((!diff_type || diff_type == NORMAL_DIFF) && 371 last_line_was_command && 372 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 373 p_start = previous_line; 374 p_sline = p_input_line - 1; 375 p_indent = indent; 376 retval = NORMAL_DIFF; 377 goto scan_exit; 378 } 379 } 380 scan_exit: 381 if (retval == UNI_DIFF) { 382 /* unswap old and new */ 383 struct file_name tmp = names[OLD_FILE]; 384 names[OLD_FILE] = names[NEW_FILE]; 385 names[NEW_FILE] = tmp; 386 } 387 if (filearg[0] == NULL) { 388 if (posix) 389 filearg[0] = posix_name(names, ok_to_create_file); 390 else { 391 /* Ignore the Index: name for context diffs, like GNU */ 392 if (names[OLD_FILE].path != NULL || 393 names[NEW_FILE].path != NULL) { 394 free(names[INDEX_FILE].path); 395 names[INDEX_FILE].path = NULL; 396 } 397 filearg[0] = best_name(names, ok_to_create_file); 398 } 399 } 400 401 free(bestguess); 402 bestguess = NULL; 403 if (filearg[0] != NULL) 404 bestguess = savestr(filearg[0]); 405 else if (!ok_to_create_file) { 406 /* 407 * We don't want to create a new file but we need a 408 * filename to set bestguess. Avoid setting filearg[0] 409 * so the file is not created automatically. 410 */ 411 if (posix) 412 bestguess = posix_name(names, true); 413 else 414 bestguess = best_name(names, true); 415 } 416 free(names[OLD_FILE].path); 417 free(names[NEW_FILE].path); 418 free(names[INDEX_FILE].path); 419 return retval; 420 } 421 422 /* 423 * Remember where this patch ends so we know where to start up again. 424 */ 425 static void 426 next_intuit_at(off_t file_pos, LINENUM file_line) 427 { 428 p_base = file_pos; 429 p_bline = file_line; 430 } 431 432 /* 433 * Basically a verbose fseeko() to the actual diff listing. 434 */ 435 static void 436 skip_to(off_t file_pos, LINENUM file_line) 437 { 438 size_t len; 439 440 if (p_base > file_pos) 441 fatal("Internal error: seek %lld>%lld\n", 442 (long long)p_base, (long long)file_pos); 443 if (verbose && p_base < file_pos) { 444 fseeko(pfp, p_base, SEEK_SET); 445 say("The text leading up to this was:\n--------------------------\n"); 446 while (ftello(pfp) < file_pos) { 447 len = pgets(false); 448 if (len == 0) 449 fatal("Unexpected end of file\n"); 450 say("|%s", buf); 451 } 452 say("--------------------------\n"); 453 } else 454 fseeko(pfp, file_pos, SEEK_SET); 455 p_input_line = file_line - 1; 456 } 457 458 /* Make this a function for better debugging. */ 459 static void 460 malformed(void) 461 { 462 fatal("malformed patch at line %ld: %s", p_input_line, buf); 463 /* about as informative as "Syntax error" in C */ 464 } 465 466 /* 467 * True if the line has been discarded (i.e. it is a line saying 468 * "\ No newline at end of file".) 469 */ 470 static bool 471 remove_special_line(void) 472 { 473 int c; 474 475 c = fgetc(pfp); 476 if (c == '\\') { 477 do { 478 c = fgetc(pfp); 479 } while (c != EOF && c != '\n'); 480 481 return true; 482 } 483 if (c != EOF) 484 fseeko(pfp, -1, SEEK_CUR); 485 486 return false; 487 } 488 489 /* 490 * True if there is more of the current diff listing to process. 491 */ 492 bool 493 another_hunk(void) 494 { 495 off_t line_beginning; /* file pos of the current line */ 496 LINENUM repl_beginning; /* index of --- line */ 497 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 498 LINENUM fillsrc; /* index of first line to copy */ 499 LINENUM filldst; /* index of first missing line */ 500 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 501 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 502 bool repl_missing; /* we are now backtracking */ 503 off_t repl_backtrack_position; /* file pos of first repl line */ 504 LINENUM repl_patch_line; /* input line number for same */ 505 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 506 char *s; 507 size_t len; 508 int context = 0; 509 510 while (p_end >= 0) { 511 if (p_end == p_efake) 512 p_end = p_bfake; /* don't free twice */ 513 else 514 free(p_line[p_end]); 515 p_end--; 516 } 517 p_efake = -1; 518 519 p_max = hunkmax; /* gets reduced when --- found */ 520 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 521 line_beginning = ftello(pfp); 522 repl_beginning = 0; 523 fillcnt = 0; 524 fillsrc = 0; 525 filldst = 0; 526 ptrn_spaces_eaten = false; 527 repl_could_be_missing = true; 528 repl_missing = false; 529 repl_backtrack_position = 0; 530 repl_patch_line = 0; 531 ptrn_copiable = 0; 532 533 len = pgets(true); 534 p_input_line++; 535 if (len == 0 || strnNE(buf, "********", 8)) { 536 next_intuit_at(line_beginning, p_input_line); 537 return false; 538 } 539 p_context = 100; 540 p_hunk_beg = p_input_line + 1; 541 while (p_end < p_max) { 542 line_beginning = ftello(pfp); 543 len = pgets(true); 544 p_input_line++; 545 if (len == 0) { 546 if (p_max - p_end < 4) { 547 /* assume blank lines got chopped */ 548 strlcpy(buf, " \n", buf_size); 549 } else { 550 if (repl_beginning && repl_could_be_missing) { 551 repl_missing = true; 552 goto hunk_done; 553 } 554 fatal("unexpected end of file in patch\n"); 555 } 556 } 557 p_end++; 558 if (p_end >= hunkmax) 559 fatal("Internal error: hunk larger than hunk " 560 "buffer size"); 561 p_char[p_end] = *buf; 562 p_line[p_end] = NULL; 563 switch (*buf) { 564 case '*': 565 if (strnEQ(buf, "********", 8)) { 566 if (repl_beginning && repl_could_be_missing) { 567 repl_missing = true; 568 goto hunk_done; 569 } else 570 fatal("unexpected end of hunk " 571 "at line %ld\n", 572 p_input_line); 573 } 574 if (p_end != 0) { 575 if (repl_beginning && repl_could_be_missing) { 576 repl_missing = true; 577 goto hunk_done; 578 } 579 fatal("unexpected *** at line %ld: %s", 580 p_input_line, buf); 581 } 582 context = 0; 583 p_line[p_end] = savestr(buf); 584 if (out_of_mem) { 585 p_end--; 586 return false; 587 } 588 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 589 ; 590 if (!*s) 591 malformed(); 592 if (strnEQ(s, "0,0", 3)) 593 memmove(s, s + 2, strlen(s + 2) + 1); 594 p_first = (LINENUM) atol(s); 595 while (isdigit((unsigned char)*s)) 596 s++; 597 if (*s == ',') { 598 for (; *s && !isdigit((unsigned char)*s); s++) 599 ; 600 if (!*s) 601 malformed(); 602 p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1; 603 } else if (p_first) 604 p_ptrn_lines = 1; 605 else { 606 p_ptrn_lines = 0; 607 p_first = 1; 608 } 609 610 /* we need this much at least */ 611 p_max = p_ptrn_lines + 6; 612 while (p_max >= hunkmax) 613 grow_hunkmax(); 614 p_max = hunkmax; 615 break; 616 case '-': 617 if (buf[1] == '-') { 618 if (repl_beginning || 619 (p_end != p_ptrn_lines + 1 + 620 (p_char[p_end - 1] == '\n'))) { 621 if (p_end == 1) { 622 /* 623 * `old' lines were omitted; 624 * set up to fill them in 625 * from 'new' context lines. 626 */ 627 p_end = p_ptrn_lines + 1; 628 fillsrc = p_end + 1; 629 filldst = 1; 630 fillcnt = p_ptrn_lines; 631 } else { 632 if (repl_beginning) { 633 if (repl_could_be_missing) { 634 repl_missing = true; 635 goto hunk_done; 636 } 637 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 638 p_input_line, p_hunk_beg + repl_beginning); 639 } else { 640 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 641 (p_end <= p_ptrn_lines 642 ? "Premature" 643 : "Overdue"), 644 p_input_line, p_hunk_beg); 645 } 646 } 647 } 648 repl_beginning = p_end; 649 repl_backtrack_position = ftello(pfp); 650 repl_patch_line = p_input_line; 651 p_line[p_end] = savestr(buf); 652 if (out_of_mem) { 653 p_end--; 654 return false; 655 } 656 p_char[p_end] = '='; 657 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 658 ; 659 if (!*s) 660 malformed(); 661 p_newfirst = (LINENUM) atol(s); 662 while (isdigit((unsigned char)*s)) 663 s++; 664 if (*s == ',') { 665 for (; *s && !isdigit((unsigned char)*s); s++) 666 ; 667 if (!*s) 668 malformed(); 669 p_repl_lines = ((LINENUM) atol(s)) - 670 p_newfirst + 1; 671 } else if (p_newfirst) 672 p_repl_lines = 1; 673 else { 674 p_repl_lines = 0; 675 p_newfirst = 1; 676 } 677 p_max = p_repl_lines + p_end; 678 if (p_max > MAXHUNKSIZE) 679 fatal("hunk too large (%ld lines) at line %ld: %s", 680 p_max, p_input_line, buf); 681 while (p_max >= hunkmax) 682 grow_hunkmax(); 683 if (p_repl_lines != ptrn_copiable && 684 (p_context != 0 || p_repl_lines != 1)) 685 repl_could_be_missing = false; 686 break; 687 } 688 goto change_line; 689 case '+': 690 case '!': 691 repl_could_be_missing = false; 692 change_line: 693 if (buf[1] == '\n' && canonicalize) 694 strlcpy(buf + 1, " \n", buf_size - 1); 695 if (!isspace((unsigned char)buf[1]) && buf[1] != '>' && 696 buf[1] != '<' && 697 repl_beginning && repl_could_be_missing) { 698 repl_missing = true; 699 goto hunk_done; 700 } 701 if (context >= 0) { 702 if (context < p_context) 703 p_context = context; 704 context = -1000; 705 } 706 p_line[p_end] = savestr(buf + 2); 707 if (out_of_mem) { 708 p_end--; 709 return false; 710 } 711 if (p_end == p_ptrn_lines) { 712 if (remove_special_line()) { 713 int l; 714 715 l = strlen(p_line[p_end]) - 1; 716 (p_line[p_end])[l] = 0; 717 } 718 } 719 break; 720 case '\t': 721 case '\n': /* assume the 2 spaces got eaten */ 722 if (repl_beginning && repl_could_be_missing && 723 (!ptrn_spaces_eaten || 724 diff_type == NEW_CONTEXT_DIFF)) { 725 repl_missing = true; 726 goto hunk_done; 727 } 728 p_line[p_end] = savestr(buf); 729 if (out_of_mem) { 730 p_end--; 731 return false; 732 } 733 if (p_end != p_ptrn_lines + 1) { 734 ptrn_spaces_eaten |= (repl_beginning != 0); 735 context++; 736 if (!repl_beginning) 737 ptrn_copiable++; 738 p_char[p_end] = ' '; 739 } 740 break; 741 case ' ': 742 if (!isspace((unsigned char)buf[1]) && 743 repl_beginning && repl_could_be_missing) { 744 repl_missing = true; 745 goto hunk_done; 746 } 747 context++; 748 if (!repl_beginning) 749 ptrn_copiable++; 750 p_line[p_end] = savestr(buf + 2); 751 if (out_of_mem) { 752 p_end--; 753 return false; 754 } 755 break; 756 default: 757 if (repl_beginning && repl_could_be_missing) { 758 repl_missing = true; 759 goto hunk_done; 760 } 761 malformed(); 762 } 763 /* set up p_len for strncmp() so we don't have to */ 764 /* assume null termination */ 765 if (p_line[p_end]) 766 p_len[p_end] = strlen(p_line[p_end]); 767 else 768 p_len[p_end] = 0; 769 } 770 771 hunk_done: 772 if (p_end >= 0 && !repl_beginning) 773 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 774 775 if (repl_missing) { 776 777 /* reset state back to just after --- */ 778 p_input_line = repl_patch_line; 779 for (p_end--; p_end > repl_beginning; p_end--) 780 free(p_line[p_end]); 781 fseeko(pfp, repl_backtrack_position, SEEK_SET); 782 783 /* redundant 'new' context lines were omitted - set */ 784 /* up to fill them in from the old file context */ 785 if (!p_context && p_repl_lines == 1) { 786 p_repl_lines = 0; 787 p_max--; 788 } 789 fillsrc = 1; 790 filldst = repl_beginning + 1; 791 fillcnt = p_repl_lines; 792 p_end = p_max; 793 } else if (!p_context && fillcnt == 1) { 794 /* the first hunk was a null hunk with no context */ 795 /* and we were expecting one line -- fix it up. */ 796 while (filldst < p_end) { 797 p_line[filldst] = p_line[filldst + 1]; 798 p_char[filldst] = p_char[filldst + 1]; 799 p_len[filldst] = p_len[filldst + 1]; 800 filldst++; 801 } 802 #if 0 803 repl_beginning--; /* this doesn't need to be fixed */ 804 #endif 805 p_end--; 806 p_first++; /* do append rather than insert */ 807 fillcnt = 0; 808 p_ptrn_lines = 0; 809 } 810 if (diff_type == CONTEXT_DIFF && 811 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 812 if (verbose) 813 say("%s\n%s\n%s\n", 814 "(Fascinating--this is really a new-style context diff but without", 815 "the telltale extra asterisks on the *** line that usually indicate", 816 "the new style...)"); 817 diff_type = NEW_CONTEXT_DIFF; 818 } 819 /* if there were omitted context lines, fill them in now */ 820 if (fillcnt) { 821 p_bfake = filldst; /* remember where not to free() */ 822 p_efake = filldst + fillcnt - 1; 823 while (fillcnt-- > 0) { 824 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 825 fillsrc++; 826 if (fillsrc > p_end) 827 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 828 p_hunk_beg); 829 p_line[filldst] = p_line[fillsrc]; 830 p_char[filldst] = p_char[fillsrc]; 831 p_len[filldst] = p_len[fillsrc]; 832 fillsrc++; 833 filldst++; 834 } 835 while (fillsrc <= p_end && fillsrc != repl_beginning && 836 p_char[fillsrc] != ' ') 837 fillsrc++; 838 #ifdef DEBUGGING 839 if (debug & 64) 840 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 841 fillsrc, filldst, repl_beginning, p_end + 1); 842 #endif 843 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 844 malformed(); 845 if (filldst != p_end + 1 && filldst != repl_beginning) 846 malformed(); 847 } 848 if (p_line[p_end] != NULL) { 849 if (remove_special_line()) { 850 p_len[p_end] -= 1; 851 (p_line[p_end])[p_len[p_end]] = 0; 852 } 853 } 854 } else if (diff_type == UNI_DIFF) { 855 LINENUM fillold; /* index of old lines */ 856 LINENUM fillnew; /* index of new lines */ 857 char ch; 858 859 line_beginning = ftello(pfp); /* file pos of the current line */ 860 len = pgets(true); 861 p_input_line++; 862 if (len == 0 || strnNE(buf, "@@ -", 4)) { 863 next_intuit_at(line_beginning, p_input_line); 864 return false; 865 } 866 s = buf + 4; 867 if (!*s) 868 malformed(); 869 p_first = (LINENUM) atol(s); 870 while (isdigit((unsigned char)*s)) 871 s++; 872 if (*s == ',') { 873 p_ptrn_lines = (LINENUM) atol(++s); 874 while (isdigit((unsigned char)*s)) 875 s++; 876 } else 877 p_ptrn_lines = 1; 878 if (*s == ' ') 879 s++; 880 if (*s != '+' || !*++s) 881 malformed(); 882 p_newfirst = (LINENUM) atol(s); 883 while (isdigit((unsigned char)*s)) 884 s++; 885 if (*s == ',') { 886 p_repl_lines = (LINENUM) atol(++s); 887 while (isdigit((unsigned char)*s)) 888 s++; 889 } else 890 p_repl_lines = 1; 891 if (*s == ' ') 892 s++; 893 if (*s != '@') 894 malformed(); 895 if (!p_ptrn_lines) 896 p_first++; /* do append rather than insert */ 897 p_max = p_ptrn_lines + p_repl_lines + 1; 898 while (p_max >= hunkmax) 899 grow_hunkmax(); 900 fillold = 1; 901 fillnew = fillold + p_ptrn_lines; 902 p_end = fillnew + p_repl_lines; 903 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 904 p_first + p_ptrn_lines - 1); 905 p_line[0] = savestr(buf); 906 if (out_of_mem) { 907 p_end = -1; 908 return false; 909 } 910 p_char[0] = '*'; 911 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 912 p_newfirst + p_repl_lines - 1); 913 p_line[fillnew] = savestr(buf); 914 if (out_of_mem) { 915 p_end = 0; 916 return false; 917 } 918 p_char[fillnew++] = '='; 919 p_context = 100; 920 context = 0; 921 p_hunk_beg = p_input_line + 1; 922 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 923 line_beginning = ftello(pfp); 924 len = pgets(true); 925 p_input_line++; 926 if (len == 0) { 927 if (p_max - fillnew < 3) { 928 /* assume blank lines got chopped */ 929 strlcpy(buf, " \n", buf_size); 930 } else { 931 fatal("unexpected end of file in patch\n"); 932 } 933 } 934 if (*buf == '\t' || *buf == '\n') { 935 ch = ' '; /* assume the space got eaten */ 936 s = savestr(buf); 937 } else { 938 ch = *buf; 939 s = savestr(buf + 1); 940 } 941 if (out_of_mem) { 942 while (--fillnew > p_ptrn_lines) 943 free(p_line[fillnew]); 944 p_end = fillold - 1; 945 return false; 946 } 947 switch (ch) { 948 case '-': 949 if (fillold > p_ptrn_lines) { 950 free(s); 951 p_end = fillnew - 1; 952 malformed(); 953 } 954 p_char[fillold] = ch; 955 p_line[fillold] = s; 956 p_len[fillold++] = strlen(s); 957 if (fillold > p_ptrn_lines) { 958 if (remove_special_line()) { 959 p_len[fillold - 1] -= 1; 960 s[p_len[fillold - 1]] = 0; 961 } 962 } 963 break; 964 case '=': 965 ch = ' '; 966 /* FALL THROUGH */ 967 case ' ': 968 if (fillold > p_ptrn_lines) { 969 free(s); 970 while (--fillnew > p_ptrn_lines) 971 free(p_line[fillnew]); 972 p_end = fillold - 1; 973 malformed(); 974 } 975 context++; 976 p_char[fillold] = ch; 977 p_line[fillold] = s; 978 p_len[fillold++] = strlen(s); 979 s = savestr(s); 980 if (out_of_mem) { 981 while (--fillnew > p_ptrn_lines) 982 free(p_line[fillnew]); 983 p_end = fillold - 1; 984 return false; 985 } 986 if (fillold > p_ptrn_lines) { 987 if (remove_special_line()) { 988 p_len[fillold - 1] -= 1; 989 s[p_len[fillold - 1]] = 0; 990 } 991 } 992 /* FALL THROUGH */ 993 case '+': 994 if (fillnew > p_end) { 995 free(s); 996 while (--fillnew > p_ptrn_lines) 997 free(p_line[fillnew]); 998 p_end = fillold - 1; 999 malformed(); 1000 } 1001 p_char[fillnew] = ch; 1002 p_line[fillnew] = s; 1003 p_len[fillnew++] = strlen(s); 1004 if (fillold > p_ptrn_lines) { 1005 if (remove_special_line()) { 1006 p_len[fillnew - 1] -= 1; 1007 s[p_len[fillnew - 1]] = 0; 1008 } 1009 } 1010 break; 1011 default: 1012 p_end = fillnew; 1013 malformed(); 1014 } 1015 if (ch != ' ' && context > 0) { 1016 if (context < p_context) 1017 p_context = context; 1018 context = -1000; 1019 } 1020 } /* while */ 1021 } else { /* normal diff--fake it up */ 1022 char hunk_type; 1023 int i; 1024 LINENUM min, max; 1025 1026 line_beginning = ftello(pfp); 1027 p_context = 0; 1028 len = pgets(true); 1029 p_input_line++; 1030 if (len == 0 || !isdigit((unsigned char)*buf)) { 1031 next_intuit_at(line_beginning, p_input_line); 1032 return false; 1033 } 1034 p_first = (LINENUM) atol(buf); 1035 for (s = buf; isdigit((unsigned char)*s); s++) 1036 ; 1037 if (*s == ',') { 1038 p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1; 1039 while (isdigit((unsigned char)*s)) 1040 s++; 1041 } else 1042 p_ptrn_lines = (*s != 'a'); 1043 hunk_type = *s; 1044 if (hunk_type == 'a') 1045 p_first++; /* do append rather than insert */ 1046 min = (LINENUM) atol(++s); 1047 for (; isdigit((unsigned char)*s); s++) 1048 ; 1049 if (*s == ',') 1050 max = (LINENUM) atol(++s); 1051 else 1052 max = min; 1053 if (hunk_type == 'd') 1054 min++; 1055 p_end = p_ptrn_lines + 1 + max - min + 1; 1056 if (p_end > MAXHUNKSIZE) 1057 fatal("hunk too large (%ld lines) at line %ld: %s", 1058 p_end, p_input_line, buf); 1059 while (p_end >= hunkmax) 1060 grow_hunkmax(); 1061 p_newfirst = min; 1062 p_repl_lines = max - min + 1; 1063 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1064 p_first + p_ptrn_lines - 1); 1065 p_line[0] = savestr(buf); 1066 if (out_of_mem) { 1067 p_end = -1; 1068 return false; 1069 } 1070 p_char[0] = '*'; 1071 for (i = 1; i <= p_ptrn_lines; i++) { 1072 len = pgets(true); 1073 p_input_line++; 1074 if (len == 0) 1075 fatal("unexpected end of file in patch at line %ld\n", 1076 p_input_line); 1077 if (*buf != '<') 1078 fatal("< expected at line %ld of patch\n", 1079 p_input_line); 1080 p_line[i] = savestr(buf + 2); 1081 if (out_of_mem) { 1082 p_end = i - 1; 1083 return false; 1084 } 1085 p_len[i] = strlen(p_line[i]); 1086 p_char[i] = '-'; 1087 } 1088 1089 if (remove_special_line()) { 1090 p_len[i - 1] -= 1; 1091 (p_line[i - 1])[p_len[i - 1]] = 0; 1092 } 1093 if (hunk_type == 'c') { 1094 len = pgets(true); 1095 p_input_line++; 1096 if (len == 0) 1097 fatal("unexpected end of file in patch at line %ld\n", 1098 p_input_line); 1099 if (*buf != '-') 1100 fatal("--- expected at line %ld of patch\n", 1101 p_input_line); 1102 } 1103 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1104 p_line[i] = savestr(buf); 1105 if (out_of_mem) { 1106 p_end = i - 1; 1107 return false; 1108 } 1109 p_char[i] = '='; 1110 for (i++; i <= p_end; i++) { 1111 len = pgets(true); 1112 p_input_line++; 1113 if (len == 0) 1114 fatal("unexpected end of file in patch at line %ld\n", 1115 p_input_line); 1116 if (*buf != '>') 1117 fatal("> expected at line %ld of patch\n", 1118 p_input_line); 1119 p_line[i] = savestr(buf + 2); 1120 if (out_of_mem) { 1121 p_end = i - 1; 1122 return false; 1123 } 1124 p_len[i] = strlen(p_line[i]); 1125 p_char[i] = '+'; 1126 } 1127 1128 if (remove_special_line()) { 1129 p_len[i - 1] -= 1; 1130 (p_line[i - 1])[p_len[i - 1]] = 0; 1131 } 1132 } 1133 if (reverse) /* backwards patch? */ 1134 if (!pch_swap()) 1135 say("Not enough memory to swap next hunk!\n"); 1136 #ifdef DEBUGGING 1137 if (debug & 2) { 1138 int i; 1139 char special; 1140 1141 for (i = 0; i <= p_end; i++) { 1142 if (i == p_ptrn_lines) 1143 special = '^'; 1144 else 1145 special = ' '; 1146 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1147 special, p_line[i]); 1148 fflush(stderr); 1149 } 1150 } 1151 #endif 1152 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1153 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1154 return true; 1155 } 1156 1157 /* 1158 * Input a line from the patch file. 1159 * Worry about indentation if do_indent is true. 1160 * The line is read directly into the buf global variable which 1161 * is resized if necessary in order to hold the complete line. 1162 * Returns the number of characters read including the terminating 1163 * '\n', if any. 1164 */ 1165 size_t 1166 pgets(bool do_indent) 1167 { 1168 char *line; 1169 size_t len; 1170 int indent = 0, skipped = 0; 1171 1172 line = fgetln(pfp, &len); 1173 if (line != NULL) { 1174 if (len + 1 > buf_size) { 1175 while (len + 1 > buf_size) 1176 buf_size *= 2; 1177 free(buf); 1178 buf = malloc(buf_size); 1179 if (buf == NULL) 1180 fatal("out of memory\n"); 1181 } 1182 if (do_indent == 1 && p_indent) { 1183 for (; 1184 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1185 line++, skipped++) { 1186 if (*line == '\t') 1187 indent += 8 - (indent %7); 1188 else 1189 indent++; 1190 } 1191 } 1192 memcpy(buf, line, len - skipped); 1193 buf[len - skipped] = '\0'; 1194 } 1195 return len; 1196 } 1197 1198 1199 /* 1200 * Reverse the old and new portions of the current hunk. 1201 */ 1202 bool 1203 pch_swap(void) 1204 { 1205 char **tp_line; /* the text of the hunk */ 1206 unsigned short *tp_len;/* length of each line */ 1207 char *tp_char; /* +, -, and ! */ 1208 LINENUM i; 1209 LINENUM n; 1210 bool blankline = false; 1211 char *s; 1212 1213 i = p_first; 1214 p_first = p_newfirst; 1215 p_newfirst = i; 1216 1217 /* make a scratch copy */ 1218 1219 tp_line = p_line; 1220 tp_len = p_len; 1221 tp_char = p_char; 1222 p_line = NULL; /* force set_hunkmax to allocate again */ 1223 p_len = NULL; 1224 p_char = NULL; 1225 set_hunkmax(); 1226 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1227 1228 free(p_line); 1229 p_line = tp_line; 1230 free(p_len); 1231 p_len = tp_len; 1232 free(p_char); 1233 p_char = tp_char; 1234 return false; /* not enough memory to swap hunk! */ 1235 } 1236 /* now turn the new into the old */ 1237 1238 i = p_ptrn_lines + 1; 1239 if (tp_char[i] == '\n') { /* account for possible blank line */ 1240 blankline = true; 1241 i++; 1242 } 1243 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1244 if (p_efake <= i) 1245 n = p_end - i + 1; 1246 else 1247 n = -i; 1248 p_efake += n; 1249 p_bfake += n; 1250 } 1251 for (n = 0; i <= p_end; i++, n++) { 1252 p_line[n] = tp_line[i]; 1253 p_char[n] = tp_char[i]; 1254 if (p_char[n] == '+') 1255 p_char[n] = '-'; 1256 p_len[n] = tp_len[i]; 1257 } 1258 if (blankline) { 1259 i = p_ptrn_lines + 1; 1260 p_line[n] = tp_line[i]; 1261 p_char[n] = tp_char[i]; 1262 p_len[n] = tp_len[i]; 1263 n++; 1264 } 1265 if (p_char[0] != '=') 1266 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1267 p_input_line, p_char[0]); 1268 p_char[0] = '*'; 1269 for (s = p_line[0]; *s; s++) 1270 if (*s == '-') 1271 *s = '*'; 1272 1273 /* now turn the old into the new */ 1274 1275 if (p_char[0] != '*') 1276 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1277 p_input_line, p_char[0]); 1278 tp_char[0] = '='; 1279 for (s = tp_line[0]; *s; s++) 1280 if (*s == '*') 1281 *s = '-'; 1282 for (i = 0; n <= p_end; i++, n++) { 1283 p_line[n] = tp_line[i]; 1284 p_char[n] = tp_char[i]; 1285 if (p_char[n] == '-') 1286 p_char[n] = '+'; 1287 p_len[n] = tp_len[i]; 1288 } 1289 1290 if (i != p_ptrn_lines + 1) 1291 fatal("Malformed patch at line %ld: expected %ld lines, " 1292 "got %ld\n", 1293 p_input_line, p_ptrn_lines + 1, i); 1294 1295 i = p_ptrn_lines; 1296 p_ptrn_lines = p_repl_lines; 1297 p_repl_lines = i; 1298 1299 free(tp_line); 1300 free(tp_len); 1301 free(tp_char); 1302 1303 return true; 1304 } 1305 1306 /* 1307 * Return the specified line position in the old file of the old context. 1308 */ 1309 LINENUM 1310 pch_first(void) 1311 { 1312 return p_first; 1313 } 1314 1315 /* 1316 * Return the number of lines of old context. 1317 */ 1318 LINENUM 1319 pch_ptrn_lines(void) 1320 { 1321 return p_ptrn_lines; 1322 } 1323 1324 /* 1325 * Return the probable line position in the new file of the first line. 1326 */ 1327 LINENUM 1328 pch_newfirst(void) 1329 { 1330 return p_newfirst; 1331 } 1332 1333 /* 1334 * Return the number of lines in the replacement text including context. 1335 */ 1336 LINENUM 1337 pch_repl_lines(void) 1338 { 1339 return p_repl_lines; 1340 } 1341 1342 /* 1343 * Return the number of lines in the whole hunk. 1344 */ 1345 LINENUM 1346 pch_end(void) 1347 { 1348 return p_end; 1349 } 1350 1351 /* 1352 * Return the number of context lines before the first changed line. 1353 */ 1354 LINENUM 1355 pch_context(void) 1356 { 1357 return p_context; 1358 } 1359 1360 /* 1361 * Return the length of a particular patch line. 1362 */ 1363 unsigned short 1364 pch_line_len(LINENUM line) 1365 { 1366 return p_len[line]; 1367 } 1368 1369 /* 1370 * Return the control character (+, -, *, !, etc) for a patch line. 1371 */ 1372 char 1373 pch_char(LINENUM line) 1374 { 1375 return p_char[line]; 1376 } 1377 1378 /* 1379 * Return a pointer to a particular patch line. 1380 */ 1381 char * 1382 pfetch(LINENUM line) 1383 { 1384 return p_line[line]; 1385 } 1386 1387 /* 1388 * Return where in the patch file this hunk began, for error messages. 1389 */ 1390 LINENUM 1391 pch_hunk_beg(void) 1392 { 1393 return p_hunk_beg; 1394 } 1395 1396 /* 1397 * Apply an ed script by feeding ed itself. 1398 */ 1399 void 1400 do_ed_script(void) 1401 { 1402 char *t; 1403 off_t beginning_of_this_line; 1404 FILE *pipefp = NULL; 1405 1406 if (!skip_rest_of_patch) { 1407 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1408 unlink(TMPOUTNAME); 1409 fatal("can't create temp file %s", TMPOUTNAME); 1410 } 1411 snprintf(buf, buf_size, "%s%s%s", _PATH_ED, 1412 verbose ? " " : " -s ", TMPOUTNAME); 1413 pipefp = popen(buf, "w"); 1414 } 1415 for (;;) { 1416 beginning_of_this_line = ftello(pfp); 1417 if (pgets(true) == 0) { 1418 next_intuit_at(beginning_of_this_line, p_input_line); 1419 break; 1420 } 1421 p_input_line++; 1422 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1423 ; 1424 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1425 if (isdigit((unsigned char)*buf) && (*t == 'a' || *t == 'c' || 1426 *t == 'd' || *t == 'i' || *t == 's')) { 1427 if (pipefp != NULL) 1428 fputs(buf, pipefp); 1429 if (*t != 'd') { 1430 while (pgets(true)) { 1431 p_input_line++; 1432 if (pipefp != NULL) 1433 fputs(buf, pipefp); 1434 if (strEQ(buf, ".\n")) 1435 break; 1436 } 1437 } 1438 } else { 1439 next_intuit_at(beginning_of_this_line, p_input_line); 1440 break; 1441 } 1442 } 1443 if (pipefp == NULL) 1444 return; 1445 fprintf(pipefp, "w\n"); 1446 fprintf(pipefp, "q\n"); 1447 fflush(pipefp); 1448 pclose(pipefp); 1449 ignore_signals(); 1450 if (!check_only) { 1451 if (move_file(TMPOUTNAME, outname) < 0) { 1452 toutkeep = true; 1453 chmod(TMPOUTNAME, filemode); 1454 } else 1455 chmod(outname, filemode); 1456 } 1457 set_signals(1); 1458 } 1459 1460 /* 1461 * Choose the name of the file to be patched based on POSIX rules. 1462 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1463 * if the user specified --posix or set POSIXLY_CORRECT. 1464 */ 1465 static char * 1466 posix_name(const struct file_name *names, bool assume_exists) 1467 { 1468 char *path = NULL; 1469 int i; 1470 1471 /* 1472 * POSIX states that the filename will be chosen from one 1473 * of the old, new and index names (in that order) if 1474 * the file exists relative to CWD after -p stripping. 1475 */ 1476 for (i = 0; i < MAX_FILE; i++) { 1477 if (names[i].path != NULL && names[i].exists) { 1478 path = names[i].path; 1479 break; 1480 } 1481 } 1482 if (path == NULL && !assume_exists) { 1483 /* 1484 * No files found, look for something we can checkout from 1485 * RCS/SCCS dirs. Same order as above. 1486 */ 1487 for (i = 0; i < MAX_FILE; i++) { 1488 if (names[i].path != NULL && 1489 (path = checked_in(names[i].path)) != NULL) 1490 break; 1491 } 1492 /* 1493 * Still no match? Check to see if the diff could be creating 1494 * a new file. 1495 */ 1496 if (path == NULL && ok_to_create_file && 1497 names[NEW_FILE].path != NULL) 1498 path = names[NEW_FILE].path; 1499 } 1500 1501 return path ? savestr(path) : NULL; 1502 } 1503 1504 static char * 1505 compare_names(const struct file_name *names, bool assume_exists, int phase) 1506 { 1507 size_t min_components, min_baselen, min_len, tmp; 1508 char *best = NULL; 1509 char *path; 1510 int i; 1511 1512 /* 1513 * The "best" name is the one with the fewest number of path 1514 * components, the shortest basename length, and the shortest 1515 * overall length (in that order). We only use the Index: file 1516 * if neither of the old or new files could be intuited from 1517 * the diff header. 1518 */ 1519 min_components = min_baselen = min_len = SIZE_MAX; 1520 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1521 path = names[i].path; 1522 if (path == NULL || 1523 (phase == 1 && !names[i].exists && !assume_exists) || 1524 (phase == 2 && checked_in(path) == NULL)) 1525 continue; 1526 if ((tmp = num_components(path)) > min_components) 1527 continue; 1528 if (tmp < min_components) { 1529 min_components = tmp; 1530 best = path; 1531 } 1532 if ((tmp = strlen(basename(path))) > min_baselen) 1533 continue; 1534 if (tmp < min_baselen) { 1535 min_baselen = tmp; 1536 best = path; 1537 } 1538 if ((tmp = strlen(path)) > min_len) 1539 continue; 1540 min_len = tmp; 1541 best = path; 1542 } 1543 return best; 1544 } 1545 1546 /* 1547 * Choose the name of the file to be patched based the "best" one 1548 * available. 1549 */ 1550 static char * 1551 best_name(const struct file_name *names, bool assume_exists) 1552 { 1553 char *best; 1554 1555 best = compare_names(names, assume_exists, 1); 1556 if (best == NULL) { 1557 best = compare_names(names, assume_exists, 2); 1558 /* 1559 * Still no match? Check to see if the diff could be creating 1560 * a new file. 1561 */ 1562 if (best == NULL && ok_to_create_file && 1563 names[NEW_FILE].path != NULL) 1564 best = names[NEW_FILE].path; 1565 } 1566 1567 return best ? savestr(best) : NULL; 1568 } 1569 1570 static size_t 1571 num_components(const char *path) 1572 { 1573 size_t n; 1574 const char *cp; 1575 1576 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1577 while (*cp == '/') 1578 cp++; /* skip consecutive slashes */ 1579 } 1580 return n; 1581 } 1582