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 1.39 2012/04/11 08:07:13 ajacoutot 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 long 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 LINENUM p_base; /* where to intuit this time */ 64 static LINENUM p_bline; /* line # of p_base */ 65 static LINENUM 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(LINENUM, LINENUM); 76 static void skip_to(LINENUM, 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 fstat(fileno(pfp), &filestat); 123 p_filesize = filestat.st_size; 124 next_intuit_at(0L, 1L); /* start at the beginning */ 125 set_hunkmax(); 126 } 127 128 /* 129 * Make sure our dynamically realloced tables are malloced to begin with. 130 */ 131 void 132 set_hunkmax(void) 133 { 134 if (p_line == NULL) 135 p_line = malloc(hunkmax * sizeof(char *)); 136 if (p_len == NULL) 137 p_len = malloc(hunkmax * sizeof(unsigned short)); 138 if (p_char == NULL) 139 p_char = malloc(hunkmax * sizeof(char)); 140 } 141 142 /* 143 * Enlarge the arrays containing the current hunk of patch. 144 */ 145 static void 146 grow_hunkmax(void) 147 { 148 int new_hunkmax = hunkmax * 2; 149 150 if (p_line == NULL || p_len == NULL || p_char == NULL) 151 fatal("Internal memory allocation error\n"); 152 153 p_line = reallocf(p_line, new_hunkmax * sizeof(char *)); 154 p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short)); 155 p_char = reallocf(p_char, new_hunkmax * sizeof(char)); 156 157 if (p_line != NULL && p_len != NULL && p_char != NULL) { 158 hunkmax = new_hunkmax; 159 return; 160 } 161 162 if (!using_plan_a) 163 fatal("out of memory\n"); 164 out_of_mem = true; /* whatever is null will be allocated again */ 165 /* from within plan_a(), of all places */ 166 } 167 168 /* True if the remainder of the patch file contains a diff of some sort. */ 169 170 bool 171 there_is_another_patch(void) 172 { 173 bool exists = false; 174 175 if (p_base != 0L && p_base >= p_filesize) { 176 if (verbose) 177 say("done\n"); 178 return false; 179 } 180 if (verbose) 181 say("Hmm..."); 182 diff_type = intuit_diff_type(); 183 if (!diff_type) { 184 if (p_base != 0L) { 185 if (verbose) 186 say(" Ignoring the trailing garbage.\ndone\n"); 187 } else 188 say(" I can't seem to find a patch in there anywhere.\n"); 189 return false; 190 } 191 if (verbose) 192 say(" %sooks like %s to me...\n", 193 (p_base == 0L ? "L" : "The next patch l"), 194 diff_type == UNI_DIFF ? "a unified diff" : 195 diff_type == CONTEXT_DIFF ? "a context diff" : 196 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 197 diff_type == NORMAL_DIFF ? "a normal diff" : 198 "an ed script"); 199 if (p_indent && verbose) 200 say("(Patch is indented %d space%s.)\n", p_indent, 201 p_indent == 1 ? "" : "s"); 202 skip_to(p_start, p_sline); 203 while (filearg[0] == NULL) { 204 if (force || batch) { 205 say("No file to patch. Skipping...\n"); 206 filearg[0] = savestr(bestguess); 207 skip_rest_of_patch = true; 208 return true; 209 } 210 ask("File to patch: "); 211 if (*buf != '\n') { 212 free(bestguess); 213 bestguess = savestr(buf); 214 filearg[0] = fetchname(buf, &exists, 0); 215 } 216 if (!exists) { 217 ask("No file found--skip this patch? [n] "); 218 if (*buf != 'y') 219 continue; 220 if (verbose) 221 say("Skipping patch...\n"); 222 free(filearg[0]); 223 filearg[0] = fetchname(bestguess, &exists, 0); 224 skip_rest_of_patch = true; 225 return true; 226 } 227 } 228 return true; 229 } 230 231 static void 232 p4_fetchname(struct file_name *name, char *str) 233 { 234 char *t, *h; 235 236 /* Skip leading whitespace. */ 237 while (isspace((unsigned char)*str)) 238 str++; 239 240 /* Remove the file revision number. */ 241 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 242 if (*t == '#') 243 h = t; 244 if (h != NULL) 245 *h = '\0'; 246 247 name->path = fetchname(str, &name->exists, strippath); 248 } 249 250 /* Determine what kind of diff is in the remaining part of the patch file. */ 251 252 static int 253 intuit_diff_type(void) 254 { 255 long this_line = 0, previous_line; 256 long first_command_line = -1; 257 LINENUM fcl_line = -1; 258 bool last_line_was_command = false, this_is_a_command = false; 259 bool stars_last_line = false, stars_this_line = false; 260 char *s, *t; 261 int indent, retval; 262 struct file_name names[MAX_FILE]; 263 264 memset(names, 0, sizeof(names)); 265 ok_to_create_file = false; 266 fseek(pfp, p_base, SEEK_SET); 267 p_input_line = p_bline - 1; 268 for (;;) { 269 previous_line = this_line; 270 last_line_was_command = this_is_a_command; 271 stars_last_line = stars_this_line; 272 this_line = ftell(pfp); 273 indent = 0; 274 p_input_line++; 275 if (pgets(false) == 0) { 276 if (first_command_line >= 0L) { 277 /* nothing but deletes!? */ 278 p_start = first_command_line; 279 p_sline = fcl_line; 280 retval = ED_DIFF; 281 goto scan_exit; 282 } else { 283 p_start = this_line; 284 p_sline = p_input_line; 285 retval = 0; 286 goto scan_exit; 287 } 288 } 289 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 290 if (*s == '\t') 291 indent += 8 - (indent % 8); 292 else 293 indent++; 294 } 295 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 296 ; 297 this_is_a_command = (isdigit((unsigned char)*s) && 298 (*t == 'd' || *t == 'c' || *t == 'a')); 299 if (first_command_line < 0L && this_is_a_command) { 300 first_command_line = this_line; 301 fcl_line = p_input_line; 302 p_indent = indent; /* assume this for now */ 303 } 304 if (!stars_last_line && strnEQ(s, "*** ", 4)) 305 names[OLD_FILE].path = fetchname(s + 4, 306 &names[OLD_FILE].exists, strippath); 307 else if (strnEQ(s, "--- ", 4)) 308 names[NEW_FILE].path = fetchname(s + 4, 309 &names[NEW_FILE].exists, strippath); 310 else if (strnEQ(s, "+++ ", 4)) 311 /* pretend it is the old name */ 312 names[OLD_FILE].path = fetchname(s + 4, 313 &names[OLD_FILE].exists, strippath); 314 else if (strnEQ(s, "Index:", 6)) 315 names[INDEX_FILE].path = fetchname(s + 6, 316 &names[INDEX_FILE].exists, strippath); 317 else if (strnEQ(s, "Prereq:", 7)) { 318 for (t = s + 7; isspace((unsigned char)*t); t++) 319 ; 320 revision = savestr(t); 321 for (t = revision; *t && !isspace((unsigned char)*t); t++) 322 ; 323 *t = '\0'; 324 if (*revision == '\0') { 325 free(revision); 326 revision = NULL; 327 } 328 } else if (strnEQ(s, "==== ", 5)) { 329 /* Perforce-style diffs. */ 330 if ((t = strstr(s + 5, " - ")) != NULL) 331 p4_fetchname(&names[NEW_FILE], t + 3); 332 p4_fetchname(&names[OLD_FILE], s + 5); 333 } 334 if ((!diff_type || diff_type == ED_DIFF) && 335 first_command_line >= 0L && 336 strEQ(s, ".\n")) { 337 p_indent = indent; 338 p_start = first_command_line; 339 p_sline = fcl_line; 340 retval = ED_DIFF; 341 goto scan_exit; 342 } 343 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 344 if (strnEQ(s + 4, "0,0", 3)) 345 ok_to_create_file = true; 346 p_indent = indent; 347 p_start = this_line; 348 p_sline = p_input_line; 349 retval = UNI_DIFF; 350 goto scan_exit; 351 } 352 stars_this_line = strnEQ(s, "********", 8); 353 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 354 strnEQ(s, "*** ", 4)) { 355 if (atol(s + 4) == 0) 356 ok_to_create_file = true; 357 /* 358 * If this is a new context diff the character just 359 * before the newline is a '*'. 360 */ 361 while (*s != '\n') 362 s++; 363 p_indent = indent; 364 p_start = previous_line; 365 p_sline = p_input_line - 1; 366 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 367 goto scan_exit; 368 } 369 if ((!diff_type || diff_type == NORMAL_DIFF) && 370 last_line_was_command && 371 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 372 p_start = previous_line; 373 p_sline = p_input_line - 1; 374 p_indent = indent; 375 retval = NORMAL_DIFF; 376 goto scan_exit; 377 } 378 } 379 scan_exit: 380 if (retval == UNI_DIFF) { 381 /* unswap old and new */ 382 struct file_name tmp = names[OLD_FILE]; 383 names[OLD_FILE] = names[NEW_FILE]; 384 names[NEW_FILE] = tmp; 385 } 386 if (filearg[0] == NULL) { 387 if (posix) 388 filearg[0] = posix_name(names, ok_to_create_file); 389 else { 390 /* Ignore the Index: name for context diffs, like GNU */ 391 if (names[OLD_FILE].path != NULL || 392 names[NEW_FILE].path != NULL) { 393 free(names[INDEX_FILE].path); 394 names[INDEX_FILE].path = NULL; 395 } 396 filearg[0] = best_name(names, ok_to_create_file); 397 } 398 } 399 400 free(bestguess); 401 bestguess = NULL; 402 if (filearg[0] != NULL) 403 bestguess = savestr(filearg[0]); 404 else if (!ok_to_create_file) { 405 /* 406 * We don't want to create a new file but we need a 407 * filename to set bestguess. Avoid setting filearg[0] 408 * so the file is not created automatically. 409 */ 410 if (posix) 411 bestguess = posix_name(names, true); 412 else 413 bestguess = best_name(names, true); 414 } 415 free(names[OLD_FILE].path); 416 free(names[NEW_FILE].path); 417 free(names[INDEX_FILE].path); 418 return retval; 419 } 420 421 /* 422 * Remember where this patch ends so we know where to start up again. 423 */ 424 static void 425 next_intuit_at(LINENUM file_pos, LINENUM file_line) 426 { 427 p_base = file_pos; 428 p_bline = file_line; 429 } 430 431 /* 432 * Basically a verbose fseek() to the actual diff listing. 433 */ 434 static void 435 skip_to(LINENUM file_pos, LINENUM file_line) 436 { 437 size_t len; 438 439 if (p_base > file_pos) 440 fatal("Internal error: seek %ld>%ld\n", p_base, file_pos); 441 if (verbose && p_base < file_pos) { 442 fseek(pfp, p_base, SEEK_SET); 443 say("The text leading up to this was:\n--------------------------\n"); 444 while (ftell(pfp) < file_pos) { 445 len = pgets(false); 446 if (len == 0) 447 fatal("Unexpected end of file\n"); 448 say("|%s", buf); 449 } 450 say("--------------------------\n"); 451 } else 452 fseek(pfp, file_pos, SEEK_SET); 453 p_input_line = file_line - 1; 454 } 455 456 /* Make this a function for better debugging. */ 457 static void 458 malformed(void) 459 { 460 fatal("malformed patch at line %ld: %s", p_input_line, buf); 461 /* about as informative as "Syntax error" in C */ 462 } 463 464 /* 465 * True if the line has been discarded (i.e. it is a line saying 466 * "\ No newline at end of file".) 467 */ 468 static bool 469 remove_special_line(void) 470 { 471 int c; 472 473 c = fgetc(pfp); 474 if (c == '\\') { 475 do { 476 c = fgetc(pfp); 477 } while (c != EOF && c != '\n'); 478 479 return true; 480 } 481 if (c != EOF) 482 fseek(pfp, -1L, SEEK_CUR); 483 484 return false; 485 } 486 487 /* 488 * True if there is more of the current diff listing to process. 489 */ 490 bool 491 another_hunk(void) 492 { 493 long line_beginning; /* file pos of the current line */ 494 LINENUM repl_beginning; /* index of --- line */ 495 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 496 LINENUM fillsrc; /* index of first line to copy */ 497 LINENUM filldst; /* index of first missing line */ 498 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 499 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 500 bool repl_missing; /* we are now backtracking */ 501 long repl_backtrack_position; /* file pos of first repl line */ 502 LINENUM repl_patch_line; /* input line number for same */ 503 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 504 char *s; 505 size_t len; 506 int context = 0; 507 508 while (p_end >= 0) { 509 if (p_end == p_efake) 510 p_end = p_bfake; /* don't free twice */ 511 else 512 free(p_line[p_end]); 513 p_end--; 514 } 515 p_efake = -1; 516 517 p_max = hunkmax; /* gets reduced when --- found */ 518 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 519 line_beginning = ftell(pfp); 520 repl_beginning = 0; 521 fillcnt = 0; 522 fillsrc = 0; 523 filldst = 0; 524 ptrn_spaces_eaten = false; 525 repl_could_be_missing = true; 526 repl_missing = false; 527 repl_backtrack_position = 0; 528 repl_patch_line = 0; 529 ptrn_copiable = 0; 530 531 len = pgets(true); 532 p_input_line++; 533 if (len == 0 || strnNE(buf, "********", 8)) { 534 next_intuit_at(line_beginning, p_input_line); 535 return false; 536 } 537 p_context = 100; 538 p_hunk_beg = p_input_line + 1; 539 while (p_end < p_max) { 540 line_beginning = ftell(pfp); 541 len = pgets(true); 542 p_input_line++; 543 if (len == 0) { 544 if (p_max - p_end < 4) { 545 /* assume blank lines got chopped */ 546 strlcpy(buf, " \n", buf_size); 547 } else { 548 if (repl_beginning && repl_could_be_missing) { 549 repl_missing = true; 550 goto hunk_done; 551 } 552 fatal("unexpected end of file in patch\n"); 553 } 554 } 555 p_end++; 556 if (p_end >= hunkmax) 557 fatal("Internal error: hunk larger than hunk " 558 "buffer size"); 559 p_char[p_end] = *buf; 560 p_line[p_end] = NULL; 561 switch (*buf) { 562 case '*': 563 if (strnEQ(buf, "********", 8)) { 564 if (repl_beginning && repl_could_be_missing) { 565 repl_missing = true; 566 goto hunk_done; 567 } else 568 fatal("unexpected end of hunk " 569 "at line %ld\n", 570 p_input_line); 571 } 572 if (p_end != 0) { 573 if (repl_beginning && repl_could_be_missing) { 574 repl_missing = true; 575 goto hunk_done; 576 } 577 fatal("unexpected *** at line %ld: %s", 578 p_input_line, buf); 579 } 580 context = 0; 581 p_line[p_end] = savestr(buf); 582 if (out_of_mem) { 583 p_end--; 584 return false; 585 } 586 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 587 ; 588 if (!*s) 589 malformed(); 590 if (strnEQ(s, "0,0", 3)) 591 memmove(s, s + 2, strlen(s + 2) + 1); 592 p_first = (LINENUM) atol(s); 593 while (isdigit((unsigned char)*s)) 594 s++; 595 if (*s == ',') { 596 for (; *s && !isdigit((unsigned char)*s); s++) 597 ; 598 if (!*s) 599 malformed(); 600 p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1; 601 } else if (p_first) 602 p_ptrn_lines = 1; 603 else { 604 p_ptrn_lines = 0; 605 p_first = 1; 606 } 607 608 /* we need this much at least */ 609 p_max = p_ptrn_lines + 6; 610 while (p_max >= hunkmax) 611 grow_hunkmax(); 612 p_max = hunkmax; 613 break; 614 case '-': 615 if (buf[1] == '-') { 616 if (repl_beginning || 617 (p_end != p_ptrn_lines + 1 + 618 (p_char[p_end - 1] == '\n'))) { 619 if (p_end == 1) { 620 /* 621 * `old' lines were omitted; 622 * set up to fill them in 623 * from 'new' context lines. 624 */ 625 p_end = p_ptrn_lines + 1; 626 fillsrc = p_end + 1; 627 filldst = 1; 628 fillcnt = p_ptrn_lines; 629 } else { 630 if (repl_beginning) { 631 if (repl_could_be_missing) { 632 repl_missing = true; 633 goto hunk_done; 634 } 635 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 636 p_input_line, p_hunk_beg + repl_beginning); 637 } else { 638 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 639 (p_end <= p_ptrn_lines 640 ? "Premature" 641 : "Overdue"), 642 p_input_line, p_hunk_beg); 643 } 644 } 645 } 646 repl_beginning = p_end; 647 repl_backtrack_position = ftell(pfp); 648 repl_patch_line = p_input_line; 649 p_line[p_end] = savestr(buf); 650 if (out_of_mem) { 651 p_end--; 652 return false; 653 } 654 p_char[p_end] = '='; 655 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 656 ; 657 if (!*s) 658 malformed(); 659 p_newfirst = (LINENUM) atol(s); 660 while (isdigit((unsigned char)*s)) 661 s++; 662 if (*s == ',') { 663 for (; *s && !isdigit((unsigned char)*s); s++) 664 ; 665 if (!*s) 666 malformed(); 667 p_repl_lines = ((LINENUM) atol(s)) - 668 p_newfirst + 1; 669 } else if (p_newfirst) 670 p_repl_lines = 1; 671 else { 672 p_repl_lines = 0; 673 p_newfirst = 1; 674 } 675 p_max = p_repl_lines + p_end; 676 if (p_max > MAXHUNKSIZE) 677 fatal("hunk too large (%ld lines) at line %ld: %s", 678 p_max, p_input_line, buf); 679 while (p_max >= hunkmax) 680 grow_hunkmax(); 681 if (p_repl_lines != ptrn_copiable && 682 (p_context != 0 || p_repl_lines != 1)) 683 repl_could_be_missing = false; 684 break; 685 } 686 goto change_line; 687 case '+': 688 case '!': 689 repl_could_be_missing = false; 690 change_line: 691 if (buf[1] == '\n' && canonicalize) 692 strlcpy(buf + 1, " \n", buf_size - 1); 693 if (!isspace((unsigned char)buf[1]) && buf[1] != '>' && 694 buf[1] != '<' && 695 repl_beginning && repl_could_be_missing) { 696 repl_missing = true; 697 goto hunk_done; 698 } 699 if (context >= 0) { 700 if (context < p_context) 701 p_context = context; 702 context = -1000; 703 } 704 p_line[p_end] = savestr(buf + 2); 705 if (out_of_mem) { 706 p_end--; 707 return false; 708 } 709 if (p_end == p_ptrn_lines) { 710 if (remove_special_line()) { 711 int l; 712 713 l = strlen(p_line[p_end]) - 1; 714 (p_line[p_end])[l] = 0; 715 } 716 } 717 break; 718 case '\t': 719 case '\n': /* assume the 2 spaces got eaten */ 720 if (repl_beginning && repl_could_be_missing && 721 (!ptrn_spaces_eaten || 722 diff_type == NEW_CONTEXT_DIFF)) { 723 repl_missing = true; 724 goto hunk_done; 725 } 726 p_line[p_end] = savestr(buf); 727 if (out_of_mem) { 728 p_end--; 729 return false; 730 } 731 if (p_end != p_ptrn_lines + 1) { 732 ptrn_spaces_eaten |= (repl_beginning != 0); 733 context++; 734 if (!repl_beginning) 735 ptrn_copiable++; 736 p_char[p_end] = ' '; 737 } 738 break; 739 case ' ': 740 if (!isspace((unsigned char)buf[1]) && 741 repl_beginning && repl_could_be_missing) { 742 repl_missing = true; 743 goto hunk_done; 744 } 745 context++; 746 if (!repl_beginning) 747 ptrn_copiable++; 748 p_line[p_end] = savestr(buf + 2); 749 if (out_of_mem) { 750 p_end--; 751 return false; 752 } 753 break; 754 default: 755 if (repl_beginning && repl_could_be_missing) { 756 repl_missing = true; 757 goto hunk_done; 758 } 759 malformed(); 760 } 761 /* set up p_len for strncmp() so we don't have to */ 762 /* assume null termination */ 763 if (p_line[p_end]) 764 p_len[p_end] = strlen(p_line[p_end]); 765 else 766 p_len[p_end] = 0; 767 } 768 769 hunk_done: 770 if (p_end >= 0 && !repl_beginning) 771 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 772 773 if (repl_missing) { 774 775 /* reset state back to just after --- */ 776 p_input_line = repl_patch_line; 777 for (p_end--; p_end > repl_beginning; p_end--) 778 free(p_line[p_end]); 779 fseek(pfp, repl_backtrack_position, SEEK_SET); 780 781 /* redundant 'new' context lines were omitted - set */ 782 /* up to fill them in from the old file context */ 783 if (!p_context && p_repl_lines == 1) { 784 p_repl_lines = 0; 785 p_max--; 786 } 787 fillsrc = 1; 788 filldst = repl_beginning + 1; 789 fillcnt = p_repl_lines; 790 p_end = p_max; 791 } else if (!p_context && fillcnt == 1) { 792 /* the first hunk was a null hunk with no context */ 793 /* and we were expecting one line -- fix it up. */ 794 while (filldst < p_end) { 795 p_line[filldst] = p_line[filldst + 1]; 796 p_char[filldst] = p_char[filldst + 1]; 797 p_len[filldst] = p_len[filldst + 1]; 798 filldst++; 799 } 800 #if 0 801 repl_beginning--; /* this doesn't need to be fixed */ 802 #endif 803 p_end--; 804 p_first++; /* do append rather than insert */ 805 fillcnt = 0; 806 p_ptrn_lines = 0; 807 } 808 if (diff_type == CONTEXT_DIFF && 809 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 810 if (verbose) 811 say("%s\n%s\n%s\n", 812 "(Fascinating--this is really a new-style context diff but without", 813 "the telltale extra asterisks on the *** line that usually indicate", 814 "the new style...)"); 815 diff_type = NEW_CONTEXT_DIFF; 816 } 817 /* if there were omitted context lines, fill them in now */ 818 if (fillcnt) { 819 p_bfake = filldst; /* remember where not to free() */ 820 p_efake = filldst + fillcnt - 1; 821 while (fillcnt-- > 0) { 822 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 823 fillsrc++; 824 if (fillsrc > p_end) 825 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 826 p_hunk_beg); 827 p_line[filldst] = p_line[fillsrc]; 828 p_char[filldst] = p_char[fillsrc]; 829 p_len[filldst] = p_len[fillsrc]; 830 fillsrc++; 831 filldst++; 832 } 833 while (fillsrc <= p_end && fillsrc != repl_beginning && 834 p_char[fillsrc] != ' ') 835 fillsrc++; 836 #ifdef DEBUGGING 837 if (debug & 64) 838 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 839 fillsrc, filldst, repl_beginning, p_end + 1); 840 #endif 841 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 842 malformed(); 843 if (filldst != p_end + 1 && filldst != repl_beginning) 844 malformed(); 845 } 846 if (p_line[p_end] != NULL) { 847 if (remove_special_line()) { 848 p_len[p_end] -= 1; 849 (p_line[p_end])[p_len[p_end]] = 0; 850 } 851 } 852 } else if (diff_type == UNI_DIFF) { 853 LINENUM fillold; /* index of old lines */ 854 LINENUM fillnew; /* index of new lines */ 855 char ch; 856 857 line_beginning = ftell(pfp); /* file pos of the current line */ 858 len = pgets(true); 859 p_input_line++; 860 if (len == 0 || strnNE(buf, "@@ -", 4)) { 861 next_intuit_at(line_beginning, p_input_line); 862 return false; 863 } 864 s = buf + 4; 865 if (!*s) 866 malformed(); 867 p_first = (LINENUM) atol(s); 868 while (isdigit((unsigned char)*s)) 869 s++; 870 if (*s == ',') { 871 p_ptrn_lines = (LINENUM) atol(++s); 872 while (isdigit((unsigned char)*s)) 873 s++; 874 } else 875 p_ptrn_lines = 1; 876 if (*s == ' ') 877 s++; 878 if (*s != '+' || !*++s) 879 malformed(); 880 p_newfirst = (LINENUM) atol(s); 881 while (isdigit((unsigned char)*s)) 882 s++; 883 if (*s == ',') { 884 p_repl_lines = (LINENUM) atol(++s); 885 while (isdigit((unsigned char)*s)) 886 s++; 887 } else 888 p_repl_lines = 1; 889 if (*s == ' ') 890 s++; 891 if (*s != '@') 892 malformed(); 893 if (!p_ptrn_lines) 894 p_first++; /* do append rather than insert */ 895 p_max = p_ptrn_lines + p_repl_lines + 1; 896 while (p_max >= hunkmax) 897 grow_hunkmax(); 898 fillold = 1; 899 fillnew = fillold + p_ptrn_lines; 900 p_end = fillnew + p_repl_lines; 901 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 902 p_first + p_ptrn_lines - 1); 903 p_line[0] = savestr(buf); 904 if (out_of_mem) { 905 p_end = -1; 906 return false; 907 } 908 p_char[0] = '*'; 909 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 910 p_newfirst + p_repl_lines - 1); 911 p_line[fillnew] = savestr(buf); 912 if (out_of_mem) { 913 p_end = 0; 914 return false; 915 } 916 p_char[fillnew++] = '='; 917 p_context = 100; 918 context = 0; 919 p_hunk_beg = p_input_line + 1; 920 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 921 line_beginning = ftell(pfp); 922 len = pgets(true); 923 p_input_line++; 924 if (len == 0) { 925 if (p_max - fillnew < 3) { 926 /* assume blank lines got chopped */ 927 strlcpy(buf, " \n", buf_size); 928 } else { 929 fatal("unexpected end of file in patch\n"); 930 } 931 } 932 if (*buf == '\t' || *buf == '\n') { 933 ch = ' '; /* assume the space got eaten */ 934 s = savestr(buf); 935 } else { 936 ch = *buf; 937 s = savestr(buf + 1); 938 } 939 if (out_of_mem) { 940 while (--fillnew > p_ptrn_lines) 941 free(p_line[fillnew]); 942 p_end = fillold - 1; 943 return false; 944 } 945 switch (ch) { 946 case '-': 947 if (fillold > p_ptrn_lines) { 948 free(s); 949 p_end = fillnew - 1; 950 malformed(); 951 } 952 p_char[fillold] = ch; 953 p_line[fillold] = s; 954 p_len[fillold++] = strlen(s); 955 if (fillold > p_ptrn_lines) { 956 if (remove_special_line()) { 957 p_len[fillold - 1] -= 1; 958 s[p_len[fillold - 1]] = 0; 959 } 960 } 961 break; 962 case '=': 963 ch = ' '; 964 /* FALL THROUGH */ 965 case ' ': 966 if (fillold > p_ptrn_lines) { 967 free(s); 968 while (--fillnew > p_ptrn_lines) 969 free(p_line[fillnew]); 970 p_end = fillold - 1; 971 malformed(); 972 } 973 context++; 974 p_char[fillold] = ch; 975 p_line[fillold] = s; 976 p_len[fillold++] = strlen(s); 977 s = savestr(s); 978 if (out_of_mem) { 979 while (--fillnew > p_ptrn_lines) 980 free(p_line[fillnew]); 981 p_end = fillold - 1; 982 return false; 983 } 984 if (fillold > p_ptrn_lines) { 985 if (remove_special_line()) { 986 p_len[fillold - 1] -= 1; 987 s[p_len[fillold - 1]] = 0; 988 } 989 } 990 /* FALL THROUGH */ 991 case '+': 992 if (fillnew > p_end) { 993 free(s); 994 while (--fillnew > p_ptrn_lines) 995 free(p_line[fillnew]); 996 p_end = fillold - 1; 997 malformed(); 998 } 999 p_char[fillnew] = ch; 1000 p_line[fillnew] = s; 1001 p_len[fillnew++] = strlen(s); 1002 if (fillold > p_ptrn_lines) { 1003 if (remove_special_line()) { 1004 p_len[fillnew - 1] -= 1; 1005 s[p_len[fillnew - 1]] = 0; 1006 } 1007 } 1008 break; 1009 default: 1010 p_end = fillnew; 1011 malformed(); 1012 } 1013 if (ch != ' ' && context > 0) { 1014 if (context < p_context) 1015 p_context = context; 1016 context = -1000; 1017 } 1018 } /* while */ 1019 } else { /* normal diff--fake it up */ 1020 char hunk_type; 1021 int i; 1022 LINENUM min, max; 1023 1024 line_beginning = ftell(pfp); 1025 p_context = 0; 1026 len = pgets(true); 1027 p_input_line++; 1028 if (len == 0 || !isdigit((unsigned char)*buf)) { 1029 next_intuit_at(line_beginning, p_input_line); 1030 return false; 1031 } 1032 p_first = (LINENUM) atol(buf); 1033 for (s = buf; isdigit((unsigned char)*s); s++) 1034 ; 1035 if (*s == ',') { 1036 p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1; 1037 while (isdigit((unsigned char)*s)) 1038 s++; 1039 } else 1040 p_ptrn_lines = (*s != 'a'); 1041 hunk_type = *s; 1042 if (hunk_type == 'a') 1043 p_first++; /* do append rather than insert */ 1044 min = (LINENUM) atol(++s); 1045 for (; isdigit((unsigned char)*s); s++) 1046 ; 1047 if (*s == ',') 1048 max = (LINENUM) atol(++s); 1049 else 1050 max = min; 1051 if (hunk_type == 'd') 1052 min++; 1053 p_end = p_ptrn_lines + 1 + max - min + 1; 1054 if (p_end > MAXHUNKSIZE) 1055 fatal("hunk too large (%ld lines) at line %ld: %s", 1056 p_end, p_input_line, buf); 1057 while (p_end >= hunkmax) 1058 grow_hunkmax(); 1059 p_newfirst = min; 1060 p_repl_lines = max - min + 1; 1061 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1062 p_first + p_ptrn_lines - 1); 1063 p_line[0] = savestr(buf); 1064 if (out_of_mem) { 1065 p_end = -1; 1066 return false; 1067 } 1068 p_char[0] = '*'; 1069 for (i = 1; i <= p_ptrn_lines; i++) { 1070 len = pgets(true); 1071 p_input_line++; 1072 if (len == 0) 1073 fatal("unexpected end of file in patch at line %ld\n", 1074 p_input_line); 1075 if (*buf != '<') 1076 fatal("< expected at line %ld of patch\n", 1077 p_input_line); 1078 p_line[i] = savestr(buf + 2); 1079 if (out_of_mem) { 1080 p_end = i - 1; 1081 return false; 1082 } 1083 p_len[i] = strlen(p_line[i]); 1084 p_char[i] = '-'; 1085 } 1086 1087 if (remove_special_line()) { 1088 p_len[i - 1] -= 1; 1089 (p_line[i - 1])[p_len[i - 1]] = 0; 1090 } 1091 if (hunk_type == 'c') { 1092 len = pgets(true); 1093 p_input_line++; 1094 if (len == 0) 1095 fatal("unexpected end of file in patch at line %ld\n", 1096 p_input_line); 1097 if (*buf != '-') 1098 fatal("--- expected at line %ld of patch\n", 1099 p_input_line); 1100 } 1101 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1102 p_line[i] = savestr(buf); 1103 if (out_of_mem) { 1104 p_end = i - 1; 1105 return false; 1106 } 1107 p_char[i] = '='; 1108 for (i++; i <= p_end; i++) { 1109 len = pgets(true); 1110 p_input_line++; 1111 if (len == 0) 1112 fatal("unexpected end of file in patch at line %ld\n", 1113 p_input_line); 1114 if (*buf != '>') 1115 fatal("> expected at line %ld of patch\n", 1116 p_input_line); 1117 p_line[i] = savestr(buf + 2); 1118 if (out_of_mem) { 1119 p_end = i - 1; 1120 return false; 1121 } 1122 p_len[i] = strlen(p_line[i]); 1123 p_char[i] = '+'; 1124 } 1125 1126 if (remove_special_line()) { 1127 p_len[i - 1] -= 1; 1128 (p_line[i - 1])[p_len[i - 1]] = 0; 1129 } 1130 } 1131 if (reverse) /* backwards patch? */ 1132 if (!pch_swap()) 1133 say("Not enough memory to swap next hunk!\n"); 1134 #ifdef DEBUGGING 1135 if (debug & 2) { 1136 int i; 1137 char special; 1138 1139 for (i = 0; i <= p_end; i++) { 1140 if (i == p_ptrn_lines) 1141 special = '^'; 1142 else 1143 special = ' '; 1144 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1145 special, p_line[i]); 1146 fflush(stderr); 1147 } 1148 } 1149 #endif 1150 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1151 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1152 return true; 1153 } 1154 1155 /* 1156 * Input a line from the patch file. 1157 * Worry about indentation if do_indent is true. 1158 * The line is read directly into the buf global variable which 1159 * is resized if necessary in order to hold the complete line. 1160 * Returns the number of characters read including the terminating 1161 * '\n', if any. 1162 */ 1163 size_t 1164 pgets(bool do_indent) 1165 { 1166 char *line; 1167 size_t len; 1168 int indent = 0, skipped = 0; 1169 1170 line = fgetln(pfp, &len); 1171 if (line != NULL) { 1172 if (len + 1 > buf_size) { 1173 while (len + 1 > buf_size) 1174 buf_size *= 2; 1175 free(buf); 1176 buf = malloc(buf_size); 1177 if (buf == NULL) 1178 fatal("out of memory\n"); 1179 } 1180 if (do_indent == 1 && p_indent) { 1181 for (; 1182 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1183 line++, skipped++) { 1184 if (*line == '\t') 1185 indent += 8 - (indent %7); 1186 else 1187 indent++; 1188 } 1189 } 1190 memcpy(buf, line, len - skipped); 1191 buf[len - skipped] = '\0'; 1192 } 1193 return len; 1194 } 1195 1196 1197 /* 1198 * Reverse the old and new portions of the current hunk. 1199 */ 1200 bool 1201 pch_swap(void) 1202 { 1203 char **tp_line; /* the text of the hunk */ 1204 unsigned short *tp_len;/* length of each line */ 1205 char *tp_char; /* +, -, and ! */ 1206 LINENUM i; 1207 LINENUM n; 1208 bool blankline = false; 1209 char *s; 1210 1211 i = p_first; 1212 p_first = p_newfirst; 1213 p_newfirst = i; 1214 1215 /* make a scratch copy */ 1216 1217 tp_line = p_line; 1218 tp_len = p_len; 1219 tp_char = p_char; 1220 p_line = NULL; /* force set_hunkmax to allocate again */ 1221 p_len = NULL; 1222 p_char = NULL; 1223 set_hunkmax(); 1224 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1225 1226 free(p_line); 1227 p_line = tp_line; 1228 free(p_len); 1229 p_len = tp_len; 1230 free(p_char); 1231 p_char = tp_char; 1232 return false; /* not enough memory to swap hunk! */ 1233 } 1234 /* now turn the new into the old */ 1235 1236 i = p_ptrn_lines + 1; 1237 if (tp_char[i] == '\n') { /* account for possible blank line */ 1238 blankline = true; 1239 i++; 1240 } 1241 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1242 if (p_efake <= i) 1243 n = p_end - i + 1; 1244 else 1245 n = -i; 1246 p_efake += n; 1247 p_bfake += n; 1248 } 1249 for (n = 0; i <= p_end; i++, n++) { 1250 p_line[n] = tp_line[i]; 1251 p_char[n] = tp_char[i]; 1252 if (p_char[n] == '+') 1253 p_char[n] = '-'; 1254 p_len[n] = tp_len[i]; 1255 } 1256 if (blankline) { 1257 i = p_ptrn_lines + 1; 1258 p_line[n] = tp_line[i]; 1259 p_char[n] = tp_char[i]; 1260 p_len[n] = tp_len[i]; 1261 n++; 1262 } 1263 if (p_char[0] != '=') 1264 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1265 p_input_line, p_char[0]); 1266 p_char[0] = '*'; 1267 for (s = p_line[0]; *s; s++) 1268 if (*s == '-') 1269 *s = '*'; 1270 1271 /* now turn the old into the new */ 1272 1273 if (p_char[0] != '*') 1274 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1275 p_input_line, p_char[0]); 1276 tp_char[0] = '='; 1277 for (s = tp_line[0]; *s; s++) 1278 if (*s == '*') 1279 *s = '-'; 1280 for (i = 0; n <= p_end; i++, n++) { 1281 p_line[n] = tp_line[i]; 1282 p_char[n] = tp_char[i]; 1283 if (p_char[n] == '-') 1284 p_char[n] = '+'; 1285 p_len[n] = tp_len[i]; 1286 } 1287 1288 if (i != p_ptrn_lines + 1) 1289 fatal("Malformed patch at line %ld: expected %ld lines, " 1290 "got %ld\n", 1291 p_input_line, p_ptrn_lines + 1, i); 1292 1293 i = p_ptrn_lines; 1294 p_ptrn_lines = p_repl_lines; 1295 p_repl_lines = i; 1296 1297 free(tp_line); 1298 free(tp_len); 1299 free(tp_char); 1300 1301 return true; 1302 } 1303 1304 /* 1305 * Return the specified line position in the old file of the old context. 1306 */ 1307 LINENUM 1308 pch_first(void) 1309 { 1310 return p_first; 1311 } 1312 1313 /* 1314 * Return the number of lines of old context. 1315 */ 1316 LINENUM 1317 pch_ptrn_lines(void) 1318 { 1319 return p_ptrn_lines; 1320 } 1321 1322 /* 1323 * Return the probable line position in the new file of the first line. 1324 */ 1325 LINENUM 1326 pch_newfirst(void) 1327 { 1328 return p_newfirst; 1329 } 1330 1331 /* 1332 * Return the number of lines in the replacement text including context. 1333 */ 1334 LINENUM 1335 pch_repl_lines(void) 1336 { 1337 return p_repl_lines; 1338 } 1339 1340 /* 1341 * Return the number of lines in the whole hunk. 1342 */ 1343 LINENUM 1344 pch_end(void) 1345 { 1346 return p_end; 1347 } 1348 1349 /* 1350 * Return the number of context lines before the first changed line. 1351 */ 1352 LINENUM 1353 pch_context(void) 1354 { 1355 return p_context; 1356 } 1357 1358 /* 1359 * Return the length of a particular patch line. 1360 */ 1361 unsigned short 1362 pch_line_len(LINENUM line) 1363 { 1364 return p_len[line]; 1365 } 1366 1367 /* 1368 * Return the control character (+, -, *, !, etc) for a patch line. 1369 */ 1370 char 1371 pch_char(LINENUM line) 1372 { 1373 return p_char[line]; 1374 } 1375 1376 /* 1377 * Return a pointer to a particular patch line. 1378 */ 1379 char * 1380 pfetch(LINENUM line) 1381 { 1382 return p_line[line]; 1383 } 1384 1385 /* 1386 * Return where in the patch file this hunk began, for error messages. 1387 */ 1388 LINENUM 1389 pch_hunk_beg(void) 1390 { 1391 return p_hunk_beg; 1392 } 1393 1394 /* 1395 * Apply an ed script by feeding ed itself. 1396 */ 1397 void 1398 do_ed_script(void) 1399 { 1400 char *t; 1401 long beginning_of_this_line; 1402 FILE *pipefp = NULL; 1403 1404 if (!skip_rest_of_patch) { 1405 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1406 unlink(TMPOUTNAME); 1407 fatal("can't create temp file %s", TMPOUTNAME); 1408 } 1409 snprintf(buf, buf_size, "%s%s%s", _PATH_ED, 1410 verbose ? " " : " -s ", TMPOUTNAME); 1411 pipefp = popen(buf, "w"); 1412 } 1413 for (;;) { 1414 beginning_of_this_line = ftell(pfp); 1415 if (pgets(true) == 0) { 1416 next_intuit_at(beginning_of_this_line, p_input_line); 1417 break; 1418 } 1419 p_input_line++; 1420 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1421 ; 1422 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1423 if (isdigit((unsigned char)*buf) && (*t == 'a' || *t == 'c' || 1424 *t == 'd' || *t == 'i' || *t == 's')) { 1425 if (pipefp != NULL) 1426 fputs(buf, pipefp); 1427 if (*t != 'd') { 1428 while (pgets(true)) { 1429 p_input_line++; 1430 if (pipefp != NULL) 1431 fputs(buf, pipefp); 1432 if (strEQ(buf, ".\n")) 1433 break; 1434 } 1435 } 1436 } else { 1437 next_intuit_at(beginning_of_this_line, p_input_line); 1438 break; 1439 } 1440 } 1441 if (pipefp == NULL) 1442 return; 1443 fprintf(pipefp, "w\n"); 1444 fprintf(pipefp, "q\n"); 1445 fflush(pipefp); 1446 pclose(pipefp); 1447 ignore_signals(); 1448 if (!check_only) { 1449 if (move_file(TMPOUTNAME, outname) < 0) { 1450 toutkeep = true; 1451 chmod(TMPOUTNAME, filemode); 1452 } else 1453 chmod(outname, filemode); 1454 } 1455 set_signals(1); 1456 } 1457 1458 /* 1459 * Choose the name of the file to be patched based on POSIX rules. 1460 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1461 * if the user specified --posix or set POSIXLY_CORRECT. 1462 */ 1463 static char * 1464 posix_name(const struct file_name *names, bool assume_exists) 1465 { 1466 char *path = NULL; 1467 int i; 1468 1469 /* 1470 * POSIX states that the filename will be chosen from one 1471 * of the old, new and index names (in that order) if 1472 * the file exists relative to CWD after -p stripping. 1473 */ 1474 for (i = 0; i < MAX_FILE; i++) { 1475 if (names[i].path != NULL && names[i].exists) { 1476 path = names[i].path; 1477 break; 1478 } 1479 } 1480 if (path == NULL && !assume_exists) { 1481 /* 1482 * No files found, look for something we can checkout from 1483 * RCS/SCCS dirs. Same order as above. 1484 */ 1485 for (i = 0; i < MAX_FILE; i++) { 1486 if (names[i].path != NULL && 1487 (path = checked_in(names[i].path)) != NULL) 1488 break; 1489 } 1490 /* 1491 * Still no match? Check to see if the diff could be creating 1492 * a new file. 1493 */ 1494 if (path == NULL && ok_to_create_file && 1495 names[NEW_FILE].path != NULL) 1496 path = names[NEW_FILE].path; 1497 } 1498 1499 return path ? savestr(path) : NULL; 1500 } 1501 1502 static char * 1503 compare_names(const struct file_name *names, bool assume_exists, int phase) 1504 { 1505 size_t min_components, min_baselen, min_len, tmp; 1506 char *best = NULL; 1507 char *path; 1508 int i; 1509 1510 /* 1511 * The "best" name is the one with the fewest number of path 1512 * components, the shortest basename length, and the shortest 1513 * overall length (in that order). We only use the Index: file 1514 * if neither of the old or new files could be intuited from 1515 * the diff header. 1516 */ 1517 min_components = min_baselen = min_len = SIZE_MAX; 1518 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1519 path = names[i].path; 1520 if (path == NULL || 1521 (phase == 1 && !names[i].exists && !assume_exists) || 1522 (phase == 2 && checked_in(path) == NULL)) 1523 continue; 1524 if ((tmp = num_components(path)) > min_components) 1525 continue; 1526 if (tmp < min_components) { 1527 min_components = tmp; 1528 best = path; 1529 } 1530 if ((tmp = strlen(basename(path))) > min_baselen) 1531 continue; 1532 if (tmp < min_baselen) { 1533 min_baselen = tmp; 1534 best = path; 1535 } 1536 if ((tmp = strlen(path)) > min_len) 1537 continue; 1538 min_len = tmp; 1539 best = path; 1540 } 1541 return best; 1542 } 1543 1544 /* 1545 * Choose the name of the file to be patched based the "best" one 1546 * available. 1547 */ 1548 static char * 1549 best_name(const struct file_name *names, bool assume_exists) 1550 { 1551 char *best; 1552 1553 best = compare_names(names, assume_exists, 1); 1554 if (best == NULL) { 1555 best = compare_names(names, assume_exists, 2); 1556 /* 1557 * Still no match? Check to see if the diff could be creating 1558 * a new file. 1559 */ 1560 if (best == NULL && ok_to_create_file && 1561 names[NEW_FILE].path != NULL) 1562 best = names[NEW_FILE].path; 1563 } 1564 1565 return best ? savestr(best) : NULL; 1566 } 1567 1568 static size_t 1569 num_components(const char *path) 1570 { 1571 size_t n; 1572 const char *cp; 1573 1574 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1575 while (*cp == '/') 1576 cp++; /* skip consecutive slashes */ 1577 } 1578 return n; 1579 } 1580