pch.c revision 275840
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 1.43 2014/11/18 17:03:35 tobias Exp $ 28 * $FreeBSD: stable/10/usr.bin/patch/pch.c 275840 2014-12-16 21:05:28Z pfg $ 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 49static long p_filesize; /* size of the patch file */ 50static LINENUM p_first; /* 1st line number */ 51static LINENUM p_newfirst; /* 1st line number of replacement */ 52static LINENUM p_ptrn_lines; /* # lines in pattern */ 53static LINENUM p_repl_lines; /* # lines in replacement text */ 54static LINENUM p_end = -1; /* last line in hunk */ 55static LINENUM p_max; /* max allowed value of p_end */ 56static LINENUM p_context = 3; /* # of context lines */ 57static LINENUM p_input_line = 0; /* current line # from patch file */ 58static char **p_line = NULL;/* the text of the hunk */ 59static unsigned short *p_len = NULL; /* length of each line */ 60static char *p_char = NULL; /* +, -, and ! */ 61static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 62static int p_indent; /* indent to patch */ 63static LINENUM p_base; /* where to intuit this time */ 64static LINENUM p_bline; /* line # of p_base */ 65static LINENUM p_start; /* where intuit found a patch */ 66static LINENUM p_sline; /* and the line number for it */ 67static LINENUM p_hunk_beg; /* line number of current hunk */ 68static LINENUM p_efake = -1; /* end of faked up lines--don't free */ 69static LINENUM p_bfake = -1; /* beg of faked up lines */ 70static FILE *pfp = NULL; /* patch file pointer */ 71static char *bestguess = NULL; /* guess at correct filename */ 72 73static void grow_hunkmax(void); 74static int intuit_diff_type(void); 75static void next_intuit_at(LINENUM, LINENUM); 76static void skip_to(LINENUM, LINENUM); 77static size_t pgets(bool _do_indent); 78static char *best_name(const struct file_name *, bool); 79static char *posix_name(const struct file_name *, bool); 80static size_t num_components(const char *); 81 82/* 83 * Prepare to look for the next patch in the patch file. 84 */ 85void 86re_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 */ 100void 101open_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 */ 131void 132set_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 */ 145static void 146grow_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 170bool 171there_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 231static void 232p4_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 252static int 253intuit_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; 322 *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 >= 0L && 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 * before the newline is a '*'. 361 */ 362 while (*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 } 380scan_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 */ 425static void 426next_intuit_at(LINENUM file_pos, LINENUM file_line) 427{ 428 p_base = file_pos; 429 p_bline = file_line; 430} 431 432/* 433 * Basically a verbose fseek() to the actual diff listing. 434 */ 435static void 436skip_to(LINENUM file_pos, LINENUM file_line) 437{ 438 size_t len; 439 440 if (p_base > file_pos) 441 fatal("Internal error: seek %ld>%ld\n", p_base, file_pos); 442 if (verbose && p_base < file_pos) { 443 fseek(pfp, p_base, SEEK_SET); 444 say("The text leading up to this was:\n--------------------------\n"); 445 while (ftell(pfp) < file_pos) { 446 len = pgets(false); 447 if (len == 0) 448 fatal("Unexpected end of file\n"); 449 say("|%s", buf); 450 } 451 say("--------------------------\n"); 452 } else 453 fseek(pfp, file_pos, SEEK_SET); 454 p_input_line = file_line - 1; 455} 456 457/* Make this a function for better debugging. */ 458static void 459malformed(void) 460{ 461 fatal("malformed patch at line %ld: %s", p_input_line, buf); 462 /* about as informative as "Syntax error" in C */ 463} 464 465/* 466 * True if the line has been discarded (i.e. it is a line saying 467 * "\ No newline at end of file".) 468 */ 469static bool 470remove_special_line(void) 471{ 472 int c; 473 474 c = fgetc(pfp); 475 if (c == '\\') { 476 do { 477 c = fgetc(pfp); 478 } while (c != EOF && c != '\n'); 479 480 return true; 481 } 482 if (c != EOF) 483 fseek(pfp, -1L, SEEK_CUR); 484 485 return false; 486} 487 488/* 489 * True if there is more of the current diff listing to process. 490 */ 491bool 492another_hunk(void) 493{ 494 long line_beginning; /* file pos of the current line */ 495 LINENUM repl_beginning; /* index of --- line */ 496 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 497 LINENUM fillsrc; /* index of first line to copy */ 498 LINENUM filldst; /* index of first missing line */ 499 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 500 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 501 bool repl_missing; /* we are now backtracking */ 502 long repl_backtrack_position; /* file pos of first repl line */ 503 LINENUM repl_patch_line; /* input line number for same */ 504 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 505 char *s; 506 size_t len; 507 int context = 0; 508 509 while (p_end >= 0) { 510 if (p_end == p_efake) 511 p_end = p_bfake; /* don't free twice */ 512 else 513 free(p_line[p_end]); 514 p_end--; 515 } 516 p_efake = -1; 517 518 p_max = hunkmax; /* gets reduced when --- found */ 519 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 520 line_beginning = ftell(pfp); 521 repl_beginning = 0; 522 fillcnt = 0; 523 fillsrc = 0; 524 filldst = 0; 525 ptrn_spaces_eaten = false; 526 repl_could_be_missing = true; 527 repl_missing = false; 528 repl_backtrack_position = 0; 529 repl_patch_line = 0; 530 ptrn_copiable = 0; 531 532 len = pgets(true); 533 p_input_line++; 534 if (len == 0 || strnNE(buf, "********", 8)) { 535 next_intuit_at(line_beginning, p_input_line); 536 return false; 537 } 538 p_context = 100; 539 p_hunk_beg = p_input_line + 1; 540 while (p_end < p_max) { 541 line_beginning = ftell(pfp); 542 len = pgets(true); 543 p_input_line++; 544 if (len == 0) { 545 if (p_max - p_end < 4) { 546 /* assume blank lines got chopped */ 547 strlcpy(buf, " \n", buf_size); 548 } else { 549 if (repl_beginning && repl_could_be_missing) { 550 repl_missing = true; 551 goto hunk_done; 552 } 553 fatal("unexpected end of file in patch\n"); 554 } 555 } 556 p_end++; 557 if (p_end >= hunkmax) 558 fatal("Internal error: hunk larger than hunk " 559 "buffer size"); 560 p_char[p_end] = *buf; 561 p_line[p_end] = NULL; 562 switch (*buf) { 563 case '*': 564 if (strnEQ(buf, "********", 8)) { 565 if (repl_beginning && repl_could_be_missing) { 566 repl_missing = true; 567 goto hunk_done; 568 } else 569 fatal("unexpected end of hunk " 570 "at line %ld\n", 571 p_input_line); 572 } 573 if (p_end != 0) { 574 if (repl_beginning && repl_could_be_missing) { 575 repl_missing = true; 576 goto hunk_done; 577 } 578 fatal("unexpected *** at line %ld: %s", 579 p_input_line, buf); 580 } 581 context = 0; 582 p_line[p_end] = savestr(buf); 583 if (out_of_mem) { 584 p_end--; 585 return false; 586 } 587 for (s = buf; 588 *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 (; 599 *s && !isdigit((unsigned char)*s); s++) 600 ; 601 if (!*s) 602 malformed(); 603 p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1; 604 } else if (p_first) 605 p_ptrn_lines = 1; 606 else { 607 p_ptrn_lines = 0; 608 p_first = 1; 609 } 610 611 /* we need this much at least */ 612 p_max = p_ptrn_lines + 6; 613 while (p_max >= hunkmax) 614 grow_hunkmax(); 615 p_max = hunkmax; 616 break; 617 case '-': 618 if (buf[1] == '-') { 619 if (repl_beginning || 620 (p_end != p_ptrn_lines + 1 + 621 (p_char[p_end - 1] == '\n'))) { 622 if (p_end == 1) { 623 /* 624 * `old' lines were omitted; 625 * set up to fill them in 626 * from 'new' context lines. 627 */ 628 p_end = p_ptrn_lines + 1; 629 fillsrc = p_end + 1; 630 filldst = 1; 631 fillcnt = p_ptrn_lines; 632 } else { 633 if (repl_beginning) { 634 if (repl_could_be_missing) { 635 repl_missing = true; 636 goto hunk_done; 637 } 638 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 639 p_input_line, p_hunk_beg + repl_beginning); 640 } else { 641 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 642 (p_end <= p_ptrn_lines 643 ? "Premature" 644 : "Overdue"), 645 p_input_line, p_hunk_beg); 646 } 647 } 648 } 649 repl_beginning = p_end; 650 repl_backtrack_position = ftell(pfp); 651 repl_patch_line = p_input_line; 652 p_line[p_end] = savestr(buf); 653 if (out_of_mem) { 654 p_end--; 655 return false; 656 } 657 p_char[p_end] = '='; 658 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 659 ; 660 if (!*s) 661 malformed(); 662 p_newfirst = (LINENUM) atol(s); 663 while (isdigit((unsigned char)*s)) 664 s++; 665 if (*s == ',') { 666 for (; *s && !isdigit((unsigned char)*s); s++) 667 ; 668 if (!*s) 669 malformed(); 670 p_repl_lines = ((LINENUM) atol(s)) - 671 p_newfirst + 1; 672 } else if (p_newfirst) 673 p_repl_lines = 1; 674 else { 675 p_repl_lines = 0; 676 p_newfirst = 1; 677 } 678 p_max = p_repl_lines + p_end; 679 if (p_max > MAXHUNKSIZE) 680 fatal("hunk too large (%ld lines) at line %ld: %s", 681 p_max, p_input_line, buf); 682 while (p_max >= hunkmax) 683 grow_hunkmax(); 684 if (p_repl_lines != ptrn_copiable && 685 (p_context != 0 || p_repl_lines != 1)) 686 repl_could_be_missing = false; 687 break; 688 } 689 goto change_line; 690 case '+': 691 case '!': 692 repl_could_be_missing = false; 693 change_line: 694 if (buf[1] == '\n' && canonicalize) 695 strlcpy(buf + 1, " \n", buf_size - 1); 696 if (!isspace((unsigned char)buf[1]) && 697 buf[1] != '>' && buf[1] != '<' && 698 repl_beginning && repl_could_be_missing) { 699 repl_missing = true; 700 goto hunk_done; 701 } 702 if (context >= 0) { 703 if (context < p_context) 704 p_context = context; 705 context = -1000; 706 } 707 p_line[p_end] = savestr(buf + 2); 708 if (out_of_mem) { 709 p_end--; 710 return false; 711 } 712 if (p_end == p_ptrn_lines) { 713 if (remove_special_line()) { 714 int l; 715 716 l = strlen(p_line[p_end]) - 1; 717 (p_line[p_end])[l] = 0; 718 } 719 } 720 break; 721 case '\t': 722 case '\n': /* assume the 2 spaces got eaten */ 723 if (repl_beginning && repl_could_be_missing && 724 (!ptrn_spaces_eaten || 725 diff_type == NEW_CONTEXT_DIFF)) { 726 repl_missing = true; 727 goto hunk_done; 728 } 729 p_line[p_end] = savestr(buf); 730 if (out_of_mem) { 731 p_end--; 732 return false; 733 } 734 if (p_end != p_ptrn_lines + 1) { 735 ptrn_spaces_eaten |= (repl_beginning != 0); 736 context++; 737 if (!repl_beginning) 738 ptrn_copiable++; 739 p_char[p_end] = ' '; 740 } 741 break; 742 case ' ': 743 if (!isspace((unsigned char)buf[1]) && 744 repl_beginning && repl_could_be_missing) { 745 repl_missing = true; 746 goto hunk_done; 747 } 748 context++; 749 if (!repl_beginning) 750 ptrn_copiable++; 751 p_line[p_end] = savestr(buf + 2); 752 if (out_of_mem) { 753 p_end--; 754 return false; 755 } 756 break; 757 default: 758 if (repl_beginning && repl_could_be_missing) { 759 repl_missing = true; 760 goto hunk_done; 761 } 762 malformed(); 763 } 764 /* set up p_len for strncmp() so we don't have to */ 765 /* assume null termination */ 766 if (p_line[p_end]) 767 p_len[p_end] = strlen(p_line[p_end]); 768 else 769 p_len[p_end] = 0; 770 } 771 772hunk_done: 773 if (p_end >= 0 && !repl_beginning) 774 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 775 776 if (repl_missing) { 777 778 /* reset state back to just after --- */ 779 p_input_line = repl_patch_line; 780 for (p_end--; p_end > repl_beginning; p_end--) 781 free(p_line[p_end]); 782 fseek(pfp, repl_backtrack_position, SEEK_SET); 783 784 /* redundant 'new' context lines were omitted - set */ 785 /* up to fill them in from the old file context */ 786 if (!p_context && p_repl_lines == 1) { 787 p_repl_lines = 0; 788 p_max--; 789 } 790 fillsrc = 1; 791 filldst = repl_beginning + 1; 792 fillcnt = p_repl_lines; 793 p_end = p_max; 794 } else if (!p_context && fillcnt == 1) { 795 /* the first hunk was a null hunk with no context */ 796 /* and we were expecting one line -- fix it up. */ 797 while (filldst < p_end) { 798 p_line[filldst] = p_line[filldst + 1]; 799 p_char[filldst] = p_char[filldst + 1]; 800 p_len[filldst] = p_len[filldst + 1]; 801 filldst++; 802 } 803#if 0 804 repl_beginning--; /* this doesn't need to be fixed */ 805#endif 806 p_end--; 807 p_first++; /* do append rather than insert */ 808 fillcnt = 0; 809 p_ptrn_lines = 0; 810 } 811 if (diff_type == CONTEXT_DIFF && 812 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 813 if (verbose) 814 say("%s\n%s\n%s\n", 815 "(Fascinating--this is really a new-style context diff but without", 816 "the telltale extra asterisks on the *** line that usually indicate", 817 "the new style...)"); 818 diff_type = NEW_CONTEXT_DIFF; 819 } 820 /* if there were omitted context lines, fill them in now */ 821 if (fillcnt) { 822 p_bfake = filldst; /* remember where not to free() */ 823 p_efake = filldst + fillcnt - 1; 824 while (fillcnt-- > 0) { 825 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 826 fillsrc++; 827 if (fillsrc > p_end) 828 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 829 p_hunk_beg); 830 p_line[filldst] = p_line[fillsrc]; 831 p_char[filldst] = p_char[fillsrc]; 832 p_len[filldst] = p_len[fillsrc]; 833 fillsrc++; 834 filldst++; 835 } 836 while (fillsrc <= p_end && fillsrc != repl_beginning && 837 p_char[fillsrc] != ' ') 838 fillsrc++; 839#ifdef DEBUGGING 840 if (debug & 64) 841 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 842 fillsrc, filldst, repl_beginning, p_end + 1); 843#endif 844 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 845 malformed(); 846 if (filldst != p_end + 1 && filldst != repl_beginning) 847 malformed(); 848 } 849 if (p_line[p_end] != NULL) { 850 if (remove_special_line()) { 851 p_len[p_end] -= 1; 852 (p_line[p_end])[p_len[p_end]] = 0; 853 } 854 } 855 } else if (diff_type == UNI_DIFF) { 856 LINENUM fillold; /* index of old lines */ 857 LINENUM fillnew; /* index of new lines */ 858 char ch; 859 860 line_beginning = ftell(pfp); /* file pos of the current line */ 861 len = pgets(true); 862 p_input_line++; 863 if (len == 0 || strnNE(buf, "@@ -", 4)) { 864 next_intuit_at(line_beginning, p_input_line); 865 return false; 866 } 867 s = buf + 4; 868 if (!*s) 869 malformed(); 870 p_first = (LINENUM) atol(s); 871 while (isdigit((unsigned char)*s)) 872 s++; 873 if (*s == ',') { 874 p_ptrn_lines = (LINENUM) atol(++s); 875 while (isdigit((unsigned char)*s)) 876 s++; 877 } else 878 p_ptrn_lines = 1; 879 if (*s == ' ') 880 s++; 881 if (*s != '+' || !*++s) 882 malformed(); 883 p_newfirst = (LINENUM) atol(s); 884 while (isdigit((unsigned char)*s)) 885 s++; 886 if (*s == ',') { 887 p_repl_lines = (LINENUM) atol(++s); 888 while (isdigit((unsigned char)*s)) 889 s++; 890 } else 891 p_repl_lines = 1; 892 if (*s == ' ') 893 s++; 894 if (*s != '@') 895 malformed(); 896 if (!p_ptrn_lines) 897 p_first++; /* do append rather than insert */ 898 p_max = p_ptrn_lines + p_repl_lines + 1; 899 while (p_max >= hunkmax) 900 grow_hunkmax(); 901 fillold = 1; 902 fillnew = fillold + p_ptrn_lines; 903 p_end = fillnew + p_repl_lines; 904 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 905 p_first + p_ptrn_lines - 1); 906 p_line[0] = savestr(buf); 907 if (out_of_mem) { 908 p_end = -1; 909 return false; 910 } 911 p_char[0] = '*'; 912 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 913 p_newfirst + p_repl_lines - 1); 914 p_line[fillnew] = savestr(buf); 915 if (out_of_mem) { 916 p_end = 0; 917 return false; 918 } 919 p_char[fillnew++] = '='; 920 p_context = 100; 921 context = 0; 922 p_hunk_beg = p_input_line + 1; 923 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 924 line_beginning = ftell(pfp); 925 len = pgets(true); 926 p_input_line++; 927 if (len == 0) { 928 if (p_max - fillnew < 3) { 929 /* assume blank lines got chopped */ 930 strlcpy(buf, " \n", buf_size); 931 } else { 932 fatal("unexpected end of file in patch\n"); 933 } 934 } 935 if (*buf == '\t' || *buf == '\n') { 936 ch = ' '; /* assume the space got eaten */ 937 s = savestr(buf); 938 } else { 939 ch = *buf; 940 s = savestr(buf + 1); 941 } 942 if (out_of_mem) { 943 while (--fillnew > p_ptrn_lines) 944 free(p_line[fillnew]); 945 p_end = fillold - 1; 946 return false; 947 } 948 switch (ch) { 949 case '-': 950 if (fillold > p_ptrn_lines) { 951 free(s); 952 p_end = fillnew - 1; 953 malformed(); 954 } 955 p_char[fillold] = ch; 956 p_line[fillold] = s; 957 p_len[fillold++] = strlen(s); 958 if (fillold > p_ptrn_lines) { 959 if (remove_special_line()) { 960 p_len[fillold - 1] -= 1; 961 s[p_len[fillold - 1]] = 0; 962 } 963 } 964 break; 965 case '=': 966 ch = ' '; 967 /* FALL THROUGH */ 968 case ' ': 969 if (fillold > p_ptrn_lines) { 970 free(s); 971 while (--fillnew > p_ptrn_lines) 972 free(p_line[fillnew]); 973 p_end = fillold - 1; 974 malformed(); 975 } 976 context++; 977 p_char[fillold] = ch; 978 p_line[fillold] = s; 979 p_len[fillold++] = strlen(s); 980 s = savestr(s); 981 if (out_of_mem) { 982 while (--fillnew > p_ptrn_lines) 983 free(p_line[fillnew]); 984 p_end = fillold - 1; 985 return false; 986 } 987 if (fillold > p_ptrn_lines) { 988 if (remove_special_line()) { 989 p_len[fillold - 1] -= 1; 990 s[p_len[fillold - 1]] = 0; 991 } 992 } 993 /* FALL THROUGH */ 994 case '+': 995 if (fillnew > p_end) { 996 free(s); 997 while (--fillnew > p_ptrn_lines) 998 free(p_line[fillnew]); 999 p_end = fillold - 1; 1000 malformed(); 1001 } 1002 p_char[fillnew] = ch; 1003 p_line[fillnew] = s; 1004 p_len[fillnew++] = strlen(s); 1005 if (fillold > p_ptrn_lines) { 1006 if (remove_special_line()) { 1007 p_len[fillnew - 1] -= 1; 1008 s[p_len[fillnew - 1]] = 0; 1009 } 1010 } 1011 break; 1012 default: 1013 p_end = fillnew; 1014 malformed(); 1015 } 1016 if (ch != ' ' && context > 0) { 1017 if (context < p_context) 1018 p_context = context; 1019 context = -1000; 1020 } 1021 } /* while */ 1022 } else { /* normal diff--fake it up */ 1023 char hunk_type; 1024 int i; 1025 LINENUM min, max; 1026 1027 line_beginning = ftell(pfp); 1028 p_context = 0; 1029 len = pgets(true); 1030 p_input_line++; 1031 if (len == 0 || !isdigit((unsigned char)*buf)) { 1032 next_intuit_at(line_beginning, p_input_line); 1033 return false; 1034 } 1035 p_first = (LINENUM) atol(buf); 1036 for (s = buf; isdigit((unsigned char)*s); s++) 1037 ; 1038 if (*s == ',') { 1039 p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1; 1040 while (isdigit((unsigned char)*s)) 1041 s++; 1042 } else 1043 p_ptrn_lines = (*s != 'a'); 1044 hunk_type = *s; 1045 if (hunk_type == 'a') 1046 p_first++; /* do append rather than insert */ 1047 min = (LINENUM) atol(++s); 1048 for (; isdigit((unsigned char)*s); s++) 1049 ; 1050 if (*s == ',') 1051 max = (LINENUM) atol(++s); 1052 else 1053 max = min; 1054 if (hunk_type == 'd') 1055 min++; 1056 p_end = p_ptrn_lines + 1 + max - min + 1; 1057 if (p_end > MAXHUNKSIZE) 1058 fatal("hunk too large (%ld lines) at line %ld: %s", 1059 p_end, p_input_line, buf); 1060 while (p_end >= hunkmax) 1061 grow_hunkmax(); 1062 p_newfirst = min; 1063 p_repl_lines = max - min + 1; 1064 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1065 p_first + p_ptrn_lines - 1); 1066 p_line[0] = savestr(buf); 1067 if (out_of_mem) { 1068 p_end = -1; 1069 return false; 1070 } 1071 p_char[0] = '*'; 1072 for (i = 1; i <= p_ptrn_lines; i++) { 1073 len = pgets(true); 1074 p_input_line++; 1075 if (len == 0) 1076 fatal("unexpected end of file in patch at line %ld\n", 1077 p_input_line); 1078 if (*buf != '<') 1079 fatal("< expected at line %ld of patch\n", 1080 p_input_line); 1081 p_line[i] = savestr(buf + 2); 1082 if (out_of_mem) { 1083 p_end = i - 1; 1084 return false; 1085 } 1086 p_len[i] = strlen(p_line[i]); 1087 p_char[i] = '-'; 1088 } 1089 1090 if (remove_special_line()) { 1091 p_len[i - 1] -= 1; 1092 (p_line[i - 1])[p_len[i - 1]] = 0; 1093 } 1094 if (hunk_type == 'c') { 1095 len = pgets(true); 1096 p_input_line++; 1097 if (len == 0) 1098 fatal("unexpected end of file in patch at line %ld\n", 1099 p_input_line); 1100 if (*buf != '-') 1101 fatal("--- expected at line %ld of patch\n", 1102 p_input_line); 1103 } 1104 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1105 p_line[i] = savestr(buf); 1106 if (out_of_mem) { 1107 p_end = i - 1; 1108 return false; 1109 } 1110 p_char[i] = '='; 1111 for (i++; i <= p_end; i++) { 1112 len = pgets(true); 1113 p_input_line++; 1114 if (len == 0) 1115 fatal("unexpected end of file in patch at line %ld\n", 1116 p_input_line); 1117 if (*buf != '>') 1118 fatal("> expected at line %ld of patch\n", 1119 p_input_line); 1120 p_line[i] = savestr(buf + 2); 1121 if (out_of_mem) { 1122 p_end = i - 1; 1123 return false; 1124 } 1125 p_len[i] = strlen(p_line[i]); 1126 p_char[i] = '+'; 1127 } 1128 1129 if (remove_special_line()) { 1130 p_len[i - 1] -= 1; 1131 (p_line[i - 1])[p_len[i - 1]] = 0; 1132 } 1133 } 1134 if (reverse) /* backwards patch? */ 1135 if (!pch_swap()) 1136 say("Not enough memory to swap next hunk!\n"); 1137#ifdef DEBUGGING 1138 if (debug & 2) { 1139 int i; 1140 char special; 1141 1142 for (i = 0; i <= p_end; i++) { 1143 if (i == p_ptrn_lines) 1144 special = '^'; 1145 else 1146 special = ' '; 1147 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1148 special, p_line[i]); 1149 fflush(stderr); 1150 } 1151 } 1152#endif 1153 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1154 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1155 return true; 1156} 1157 1158/* 1159 * Input a line from the patch file. 1160 * Worry about indentation if do_indent is true. 1161 * The line is read directly into the buf global variable which 1162 * is resized if necessary in order to hold the complete line. 1163 * Returns the number of characters read including the terminating 1164 * '\n', if any. 1165 */ 1166size_t 1167pgets(bool do_indent) 1168{ 1169 char *line; 1170 size_t len; 1171 int indent = 0, skipped = 0; 1172 1173 line = fgetln(pfp, &len); 1174 if (line != NULL) { 1175 if (len + 1 > buf_size) { 1176 while (len + 1 > buf_size) 1177 buf_size *= 2; 1178 free(buf); 1179 buf = malloc(buf_size); 1180 if (buf == NULL) 1181 fatal("out of memory\n"); 1182 } 1183 if (do_indent == 1 && p_indent) { 1184 for (; 1185 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1186 line++, skipped++) { 1187 if (*line == '\t') 1188 indent += 8 - (indent %7); 1189 else 1190 indent++; 1191 } 1192 } 1193 memcpy(buf, line, len - skipped); 1194 buf[len - skipped] = '\0'; 1195 } 1196 return len; 1197} 1198 1199 1200/* 1201 * Reverse the old and new portions of the current hunk. 1202 */ 1203bool 1204pch_swap(void) 1205{ 1206 char **tp_line; /* the text of the hunk */ 1207 unsigned short *tp_len;/* length of each line */ 1208 char *tp_char; /* +, -, and ! */ 1209 LINENUM i; 1210 LINENUM n; 1211 bool blankline = false; 1212 char *s; 1213 1214 i = p_first; 1215 p_first = p_newfirst; 1216 p_newfirst = i; 1217 1218 /* make a scratch copy */ 1219 1220 tp_line = p_line; 1221 tp_len = p_len; 1222 tp_char = p_char; 1223 p_line = NULL; /* force set_hunkmax to allocate again */ 1224 p_len = NULL; 1225 p_char = NULL; 1226 set_hunkmax(); 1227 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1228 1229 free(p_line); 1230 p_line = tp_line; 1231 free(p_len); 1232 p_len = tp_len; 1233 free(p_char); 1234 p_char = tp_char; 1235 return false; /* not enough memory to swap hunk! */ 1236 } 1237 /* now turn the new into the old */ 1238 1239 i = p_ptrn_lines + 1; 1240 if (tp_char[i] == '\n') { /* account for possible blank line */ 1241 blankline = true; 1242 i++; 1243 } 1244 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1245 if (p_efake <= i) 1246 n = p_end - i + 1; 1247 else 1248 n = -i; 1249 p_efake += n; 1250 p_bfake += n; 1251 } 1252 for (n = 0; i <= p_end; i++, n++) { 1253 p_line[n] = tp_line[i]; 1254 p_char[n] = tp_char[i]; 1255 if (p_char[n] == '+') 1256 p_char[n] = '-'; 1257 p_len[n] = tp_len[i]; 1258 } 1259 if (blankline) { 1260 i = p_ptrn_lines + 1; 1261 p_line[n] = tp_line[i]; 1262 p_char[n] = tp_char[i]; 1263 p_len[n] = tp_len[i]; 1264 n++; 1265 } 1266 if (p_char[0] != '=') 1267 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1268 p_input_line, p_char[0]); 1269 p_char[0] = '*'; 1270 for (s = p_line[0]; *s; s++) 1271 if (*s == '-') 1272 *s = '*'; 1273 1274 /* now turn the old into the new */ 1275 1276 if (p_char[0] != '*') 1277 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1278 p_input_line, p_char[0]); 1279 tp_char[0] = '='; 1280 for (s = tp_line[0]; *s; s++) 1281 if (*s == '*') 1282 *s = '-'; 1283 for (i = 0; n <= p_end; i++, n++) { 1284 p_line[n] = tp_line[i]; 1285 p_char[n] = tp_char[i]; 1286 if (p_char[n] == '-') 1287 p_char[n] = '+'; 1288 p_len[n] = tp_len[i]; 1289 } 1290 1291 if (i != p_ptrn_lines + 1) 1292 fatal("Malformed patch at line %ld: expected %ld lines, " 1293 "got %ld\n", 1294 p_input_line, p_ptrn_lines + 1, i); 1295 1296 i = p_ptrn_lines; 1297 p_ptrn_lines = p_repl_lines; 1298 p_repl_lines = i; 1299 1300 free(tp_line); 1301 free(tp_len); 1302 free(tp_char); 1303 1304 return true; 1305} 1306 1307/* 1308 * Return the specified line position in the old file of the old context. 1309 */ 1310LINENUM 1311pch_first(void) 1312{ 1313 return p_first; 1314} 1315 1316/* 1317 * Return the number of lines of old context. 1318 */ 1319LINENUM 1320pch_ptrn_lines(void) 1321{ 1322 return p_ptrn_lines; 1323} 1324 1325/* 1326 * Return the probable line position in the new file of the first line. 1327 */ 1328LINENUM 1329pch_newfirst(void) 1330{ 1331 return p_newfirst; 1332} 1333 1334/* 1335 * Return the number of lines in the replacement text including context. 1336 */ 1337LINENUM 1338pch_repl_lines(void) 1339{ 1340 return p_repl_lines; 1341} 1342 1343/* 1344 * Return the number of lines in the whole hunk. 1345 */ 1346LINENUM 1347pch_end(void) 1348{ 1349 return p_end; 1350} 1351 1352/* 1353 * Return the number of context lines before the first changed line. 1354 */ 1355LINENUM 1356pch_context(void) 1357{ 1358 return p_context; 1359} 1360 1361/* 1362 * Return the length of a particular patch line. 1363 */ 1364unsigned short 1365pch_line_len(LINENUM line) 1366{ 1367 return p_len[line]; 1368} 1369 1370/* 1371 * Return the control character (+, -, *, !, etc) for a patch line. 1372 */ 1373char 1374pch_char(LINENUM line) 1375{ 1376 return p_char[line]; 1377} 1378 1379/* 1380 * Return a pointer to a particular patch line. 1381 */ 1382char * 1383pfetch(LINENUM line) 1384{ 1385 return p_line[line]; 1386} 1387 1388/* 1389 * Return where in the patch file this hunk began, for error messages. 1390 */ 1391LINENUM 1392pch_hunk_beg(void) 1393{ 1394 return p_hunk_beg; 1395} 1396 1397/* 1398 * Apply an ed script by feeding ed itself. 1399 */ 1400void 1401do_ed_script(void) 1402{ 1403 char *t; 1404 long beginning_of_this_line; 1405 FILE *pipefp = NULL; 1406 1407 if (!skip_rest_of_patch) { 1408 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1409 unlink(TMPOUTNAME); 1410 fatal("can't create temp file %s", TMPOUTNAME); 1411 } 1412 snprintf(buf, buf_size, "%s%s%s", _PATH_ED, 1413 verbose ? " " : " -s ", TMPOUTNAME); 1414 pipefp = popen(buf, "w"); 1415 } 1416 for (;;) { 1417 beginning_of_this_line = ftell(pfp); 1418 if (pgets(true) == 0) { 1419 next_intuit_at(beginning_of_this_line, p_input_line); 1420 break; 1421 } 1422 p_input_line++; 1423 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1424 ; 1425 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1426 if (isdigit((unsigned char)*buf) && 1427 (*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) { 1428 if (pipefp != NULL) 1429 fputs(buf, pipefp); 1430 if (*t != 'd') { 1431 while (pgets(true)) { 1432 p_input_line++; 1433 if (pipefp != NULL) 1434 fputs(buf, pipefp); 1435 if (strEQ(buf, ".\n")) 1436 break; 1437 } 1438 } 1439 } else { 1440 next_intuit_at(beginning_of_this_line, p_input_line); 1441 break; 1442 } 1443 } 1444 if (pipefp == NULL) 1445 return; 1446 fprintf(pipefp, "w\n"); 1447 fprintf(pipefp, "q\n"); 1448 fflush(pipefp); 1449 pclose(pipefp); 1450 ignore_signals(); 1451 if (!check_only) { 1452 if (move_file(TMPOUTNAME, outname) < 0) { 1453 toutkeep = true; 1454 chmod(TMPOUTNAME, filemode); 1455 } else 1456 chmod(outname, filemode); 1457 } 1458 set_signals(1); 1459} 1460 1461/* 1462 * Choose the name of the file to be patched based on POSIX rules. 1463 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1464 * if the user specified --posix or set POSIXLY_CORRECT. 1465 */ 1466static char * 1467posix_name(const struct file_name *names, bool assume_exists) 1468{ 1469 char *path = NULL; 1470 int i; 1471 1472 /* 1473 * POSIX states that the filename will be chosen from one 1474 * of the old, new and index names (in that order) if 1475 * the file exists relative to CWD after -p stripping. 1476 */ 1477 for (i = 0; i < MAX_FILE; i++) { 1478 if (names[i].path != NULL && names[i].exists) { 1479 path = names[i].path; 1480 break; 1481 } 1482 } 1483 if (path == NULL && !assume_exists) { 1484 /* 1485 * No files found, look for something we can checkout from 1486 * RCS/SCCS dirs. Same order as above. 1487 */ 1488 for (i = 0; i < MAX_FILE; i++) { 1489 if (names[i].path != NULL && 1490 (path = checked_in(names[i].path)) != NULL) 1491 break; 1492 } 1493 /* 1494 * Still no match? Check to see if the diff could be creating 1495 * a new file. 1496 */ 1497 if (path == NULL && ok_to_create_file && 1498 names[NEW_FILE].path != NULL) 1499 path = names[NEW_FILE].path; 1500 } 1501 1502 return path ? savestr(path) : NULL; 1503} 1504 1505static char * 1506compare_names(const struct file_name *names, bool assume_exists, int phase) 1507{ 1508 size_t min_components, min_baselen, min_len, tmp; 1509 char *best = NULL; 1510 char *path; 1511 int i; 1512 1513 /* 1514 * The "best" name is the one with the fewest number of path 1515 * components, the shortest basename length, and the shortest 1516 * overall length (in that order). We only use the Index: file 1517 * if neither of the old or new files could be intuited from 1518 * the diff header. 1519 */ 1520 min_components = min_baselen = min_len = SIZE_MAX; 1521 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1522 path = names[i].path; 1523 if (path == NULL || 1524 (phase == 1 && !names[i].exists && !assume_exists) || 1525 (phase == 2 && checked_in(path) == NULL)) 1526 continue; 1527 if ((tmp = num_components(path)) > min_components) 1528 continue; 1529 if (tmp < min_components) { 1530 min_components = tmp; 1531 best = path; 1532 } 1533 if ((tmp = strlen(basename(path))) > min_baselen) 1534 continue; 1535 if (tmp < min_baselen) { 1536 min_baselen = tmp; 1537 best = path; 1538 } 1539 if ((tmp = strlen(path)) > min_len) 1540 continue; 1541 min_len = tmp; 1542 best = path; 1543 } 1544 return best; 1545} 1546 1547/* 1548 * Choose the name of the file to be patched based the "best" one 1549 * available. 1550 */ 1551static char * 1552best_name(const struct file_name *names, bool assume_exists) 1553{ 1554 char *best; 1555 1556 best = compare_names(names, assume_exists, 1); 1557 if (best == NULL) { 1558 best = compare_names(names, assume_exists, 2); 1559 /* 1560 * Still no match? Check to see if the diff could be creating 1561 * a new file. 1562 */ 1563 if (best == NULL && ok_to_create_file && 1564 names[NEW_FILE].path != NULL) 1565 best = names[NEW_FILE].path; 1566 } 1567 1568 return best ? savestr(best) : NULL; 1569} 1570 1571static size_t 1572num_components(const char *path) 1573{ 1574 size_t n; 1575 const char *cp; 1576 1577 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1578 while (*cp == '/') 1579 cp++; /* skip consecutive slashes */ 1580 } 1581 return n; 1582} 1583