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 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; 104 105 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 106 pfp = fopen(TMPPATNAME, "w"); 107 if (pfp == NULL) 108 pfatal("can't create %s", TMPPATNAME); 109 while (fgets(buf, buf_size, stdin) != NULL) 110 fputs(buf, pfp); 111 if (ferror(pfp) || fclose(pfp)) 112 pfatal("can't write %s", TMPPATNAME); 113 filename = TMPPATNAME; 114 } 115 pfp = fopen(filename, "r"); 116 if (pfp == NULL) 117 pfatal("patch file %s not found", filename); 118 fstat(fileno(pfp), &filestat); 119 p_filesize = filestat.st_size; 120 next_intuit_at(0L, 1L); /* start at the beginning */ 121 set_hunkmax(); 122 } 123 124 /* 125 * Make sure our dynamically realloced tables are malloced to begin with. 126 */ 127 void 128 set_hunkmax(void) 129 { 130 if (p_line == NULL) 131 p_line = calloc((size_t) hunkmax, sizeof(char *)); 132 if (p_len == NULL) 133 p_len = calloc((size_t) hunkmax, sizeof(short)); 134 if (p_char == NULL) 135 p_char = calloc((size_t) hunkmax, sizeof(char)); 136 } 137 138 /* 139 * Enlarge the arrays containing the current hunk of patch. 140 */ 141 static void 142 grow_hunkmax(void) 143 { 144 int new_hunkmax; 145 char **new_p_line; 146 short *new_p_len; 147 char *new_p_char; 148 149 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 new_p_line = realloc(p_line, new_hunkmax * sizeof(char *)); 155 if (new_p_line == NULL) 156 free(p_line); 157 158 new_p_len = realloc(p_len, new_hunkmax * sizeof(short)); 159 if (new_p_len == NULL) 160 free(p_len); 161 162 new_p_char = realloc(p_char, new_hunkmax * sizeof(char)); 163 if (new_p_char == NULL) 164 free(p_char); 165 166 p_char = new_p_char; 167 p_len = new_p_len; 168 p_line = new_p_line; 169 170 if (p_line != NULL && p_len != NULL && p_char != NULL) { 171 hunkmax = new_hunkmax; 172 return; 173 } 174 175 if (!using_plan_a) 176 fatal("out of memory\n"); 177 out_of_mem = true; /* whatever is null will be allocated again */ 178 /* from within plan_a(), of all places */ 179 } 180 181 /* True if the remainder of the patch file contains a diff of some sort. */ 182 183 bool 184 there_is_another_patch(void) 185 { 186 bool exists = false; 187 188 if (p_base != 0L && p_base >= p_filesize) { 189 if (verbose) 190 say("done\n"); 191 return false; 192 } 193 if (verbose) 194 say("Hmm..."); 195 diff_type = intuit_diff_type(); 196 if (!diff_type) { 197 if (p_base != 0L) { 198 if (verbose) 199 say(" Ignoring the trailing garbage.\ndone\n"); 200 } else 201 say(" I can't seem to find a patch in there anywhere.\n"); 202 return false; 203 } 204 if (verbose) 205 say(" %sooks like %s to me...\n", 206 (p_base == 0L ? "L" : "The next patch l"), 207 diff_type == UNI_DIFF ? "a unified diff" : 208 diff_type == CONTEXT_DIFF ? "a context diff" : 209 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 210 diff_type == NORMAL_DIFF ? "a normal diff" : 211 "an ed script"); 212 if (p_indent && verbose) 213 say("(Patch is indented %d space%s.)\n", p_indent, 214 p_indent == 1 ? "" : "s"); 215 skip_to(p_start, p_sline); 216 while (filearg[0] == NULL) { 217 if (force || batch) { 218 say("No file to patch. Skipping...\n"); 219 filearg[0] = savestr(bestguess); 220 skip_rest_of_patch = true; 221 return true; 222 } 223 ask("File to patch: "); 224 if (*buf != '\n') { 225 free(bestguess); 226 bestguess = savestr(buf); 227 filearg[0] = fetchname(buf, &exists, 0); 228 } 229 if (!exists) { 230 ask("No file found--skip this patch? [n] "); 231 if (*buf != 'y') 232 continue; 233 if (verbose) 234 say("Skipping patch...\n"); 235 free(filearg[0]); 236 filearg[0] = fetchname(bestguess, &exists, 0); 237 skip_rest_of_patch = true; 238 return true; 239 } 240 } 241 return true; 242 } 243 244 static void 245 p4_fetchname(struct file_name *name, char *str) 246 { 247 char *t, *h; 248 249 /* Skip leading whitespace. */ 250 while (isspace((unsigned char)*str)) 251 str++; 252 253 /* Remove the file revision number. */ 254 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 255 if (*t == '#') 256 h = t; 257 if (h != NULL) 258 *h = '\0'; 259 260 name->path = fetchname(str, &name->exists, strippath); 261 } 262 263 /* Determine what kind of diff is in the remaining part of the patch file. */ 264 265 static int 266 intuit_diff_type(void) 267 { 268 long this_line = 0, previous_line; 269 long first_command_line = -1; 270 LINENUM fcl_line = -1; 271 bool last_line_was_command = false, this_is_a_command = false; 272 bool stars_last_line = false, stars_this_line = false; 273 char *s, *t; 274 int indent, retval; 275 struct file_name names[MAX_FILE]; 276 277 memset(names, 0, sizeof(names)); 278 ok_to_create_file = false; 279 fseek(pfp, p_base, SEEK_SET); 280 p_input_line = p_bline - 1; 281 for (;;) { 282 previous_line = this_line; 283 last_line_was_command = this_is_a_command; 284 stars_last_line = stars_this_line; 285 this_line = ftell(pfp); 286 indent = 0; 287 p_input_line++; 288 if (pgets(false) == 0) { 289 if (first_command_line >= 0L) { 290 /* nothing but deletes!? */ 291 p_start = first_command_line; 292 p_sline = fcl_line; 293 retval = ED_DIFF; 294 goto scan_exit; 295 } else { 296 p_start = this_line; 297 p_sline = p_input_line; 298 retval = 0; 299 goto scan_exit; 300 } 301 } 302 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 303 if (*s == '\t') 304 indent += 8 - (indent % 8); 305 else 306 indent++; 307 } 308 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 309 ; 310 this_is_a_command = (isdigit((unsigned char)*s) && 311 (*t == 'd' || *t == 'c' || *t == 'a')); 312 if (first_command_line < 0L && this_is_a_command) { 313 first_command_line = this_line; 314 fcl_line = p_input_line; 315 p_indent = indent; /* assume this for now */ 316 } 317 if (!stars_last_line && strnEQ(s, "*** ", 4)) 318 names[OLD_FILE].path = fetchname(s + 4, 319 &names[OLD_FILE].exists, strippath); 320 else if (strnEQ(s, "--- ", 4)) 321 names[NEW_FILE].path = fetchname(s + 4, 322 &names[NEW_FILE].exists, strippath); 323 else if (strnEQ(s, "+++ ", 4)) 324 /* pretend it is the old name */ 325 names[OLD_FILE].path = fetchname(s + 4, 326 &names[OLD_FILE].exists, strippath); 327 else if (strnEQ(s, "Index:", 6)) 328 names[INDEX_FILE].path = fetchname(s + 6, 329 &names[INDEX_FILE].exists, strippath); 330 else if (strnEQ(s, "Prereq:", 7)) { 331 for (t = s + 7; isspace((unsigned char)*t); t++) 332 ; 333 revision = savestr(t); 334 for (t = revision; *t && !isspace((unsigned char)*t); t++) 335 ; 336 *t = '\0'; 337 if (*revision == '\0') { 338 free(revision); 339 revision = NULL; 340 } 341 } else if (strnEQ(s, "==== ", 5)) { 342 /* Perforce-style diffs. */ 343 if ((t = strstr(s + 5, " - ")) != NULL) 344 p4_fetchname(&names[NEW_FILE], t + 3); 345 p4_fetchname(&names[OLD_FILE], s + 5); 346 } 347 if ((!diff_type || diff_type == ED_DIFF) && 348 first_command_line >= 0L && 349 strEQ(s, ".\n")) { 350 p_indent = indent; 351 p_start = first_command_line; 352 p_sline = fcl_line; 353 retval = ED_DIFF; 354 goto scan_exit; 355 } 356 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 357 if (strnEQ(s + 4, "0,0", 3)) 358 ok_to_create_file = true; 359 p_indent = indent; 360 p_start = this_line; 361 p_sline = p_input_line; 362 retval = UNI_DIFF; 363 goto scan_exit; 364 } 365 stars_this_line = strnEQ(s, "********", 8); 366 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 367 strnEQ(s, "*** ", 4)) { 368 if (atol(s + 4) == 0) 369 ok_to_create_file = true; 370 /* 371 * If this is a new context diff the character just 372 * before the newline is a '*'. 373 */ 374 while (*s != '\n') 375 s++; 376 p_indent = indent; 377 p_start = previous_line; 378 p_sline = p_input_line - 1; 379 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 380 goto scan_exit; 381 } 382 if ((!diff_type || diff_type == NORMAL_DIFF) && 383 last_line_was_command && 384 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 385 p_start = previous_line; 386 p_sline = p_input_line - 1; 387 p_indent = indent; 388 retval = NORMAL_DIFF; 389 goto scan_exit; 390 } 391 } 392 scan_exit: 393 if (retval == UNI_DIFF) { 394 /* unswap old and new */ 395 struct file_name tmp = names[OLD_FILE]; 396 names[OLD_FILE] = names[NEW_FILE]; 397 names[NEW_FILE] = tmp; 398 } 399 if (filearg[0] == NULL) { 400 if (posix) 401 filearg[0] = posix_name(names, ok_to_create_file); 402 else { 403 /* Ignore the Index: name for context diffs, like GNU */ 404 if (names[OLD_FILE].path != NULL || 405 names[NEW_FILE].path != NULL) { 406 free(names[INDEX_FILE].path); 407 names[INDEX_FILE].path = NULL; 408 } 409 filearg[0] = best_name(names, ok_to_create_file); 410 } 411 } 412 413 free(bestguess); 414 bestguess = NULL; 415 if (filearg[0] != NULL) 416 bestguess = savestr(filearg[0]); 417 else if (!ok_to_create_file) { 418 /* 419 * We don't want to create a new file but we need a 420 * filename to set bestguess. Avoid setting filearg[0] 421 * so the file is not created automatically. 422 */ 423 if (posix) 424 bestguess = posix_name(names, true); 425 else 426 bestguess = best_name(names, true); 427 } 428 free(names[OLD_FILE].path); 429 free(names[NEW_FILE].path); 430 free(names[INDEX_FILE].path); 431 return retval; 432 } 433 434 /* 435 * Remember where this patch ends so we know where to start up again. 436 */ 437 static void 438 next_intuit_at(LINENUM file_pos, LINENUM file_line) 439 { 440 p_base = file_pos; 441 p_bline = file_line; 442 } 443 444 /* 445 * Basically a verbose fseek() to the actual diff listing. 446 */ 447 static void 448 skip_to(LINENUM file_pos, LINENUM file_line) 449 { 450 size_t len; 451 452 if (p_base > file_pos) 453 fatal("Internal error: seek %ld>%ld\n", p_base, file_pos); 454 if (verbose && p_base < file_pos) { 455 fseek(pfp, p_base, SEEK_SET); 456 say("The text leading up to this was:\n--------------------------\n"); 457 while (ftell(pfp) < file_pos) { 458 len = pgets(false); 459 if (len == 0) 460 fatal("Unexpected end of file\n"); 461 say("|%s", buf); 462 } 463 say("--------------------------\n"); 464 } else 465 fseek(pfp, file_pos, SEEK_SET); 466 p_input_line = file_line - 1; 467 } 468 469 /* Make this a function for better debugging. */ 470 static void 471 malformed(void) 472 { 473 fatal("malformed patch at line %ld: %s", p_input_line, buf); 474 /* about as informative as "Syntax error" in C */ 475 } 476 477 /* 478 * True if the line has been discarded (i.e. it is a line saying 479 * "\ No newline at end of file".) 480 */ 481 static bool 482 remove_special_line(void) 483 { 484 int c; 485 486 c = fgetc(pfp); 487 if (c == '\\') { 488 do { 489 c = fgetc(pfp); 490 } while (c != EOF && c != '\n'); 491 492 return true; 493 } 494 if (c != EOF) 495 fseek(pfp, -1L, SEEK_CUR); 496 497 return false; 498 } 499 500 /* 501 * True if there is more of the current diff listing to process. 502 */ 503 bool 504 another_hunk(void) 505 { 506 long line_beginning; /* file pos of the current line */ 507 LINENUM repl_beginning; /* index of --- line */ 508 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 509 LINENUM fillsrc; /* index of first line to copy */ 510 LINENUM filldst; /* index of first missing line */ 511 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 512 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 513 bool repl_missing; /* we are now backtracking */ 514 long repl_backtrack_position; /* file pos of first repl line */ 515 LINENUM repl_patch_line; /* input line number for same */ 516 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 517 char *s; 518 size_t len; 519 int context = 0; 520 521 while (p_end >= 0) { 522 if (p_end == p_efake) 523 p_end = p_bfake; /* don't free twice */ 524 else 525 free(p_line[p_end]); 526 p_end--; 527 } 528 p_efake = -1; 529 530 p_max = hunkmax; /* gets reduced when --- found */ 531 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 532 line_beginning = ftell(pfp); 533 repl_beginning = 0; 534 fillcnt = 0; 535 fillsrc = 0; 536 filldst = 0; 537 ptrn_spaces_eaten = false; 538 repl_could_be_missing = true; 539 repl_missing = false; 540 repl_backtrack_position = 0; 541 repl_patch_line = 0; 542 ptrn_copiable = 0; 543 544 len = pgets(true); 545 p_input_line++; 546 if (len == 0 || strnNE(buf, "********", 8)) { 547 next_intuit_at(line_beginning, p_input_line); 548 return false; 549 } 550 p_context = 100; 551 p_hunk_beg = p_input_line + 1; 552 while (p_end < p_max) { 553 line_beginning = ftell(pfp); 554 len = pgets(true); 555 p_input_line++; 556 if (len == 0) { 557 if (p_max - p_end < 4) { 558 /* assume blank lines got chopped */ 559 strlcpy(buf, " \n", buf_size); 560 } else { 561 if (repl_beginning && repl_could_be_missing) { 562 repl_missing = true; 563 goto hunk_done; 564 } 565 fatal("unexpected end of file in patch\n"); 566 } 567 } 568 p_end++; 569 if (p_end >= hunkmax) 570 fatal("Internal error: hunk larger than hunk " 571 "buffer size"); 572 p_char[p_end] = *buf; 573 p_line[p_end] = NULL; 574 switch (*buf) { 575 case '*': 576 if (strnEQ(buf, "********", 8)) { 577 if (repl_beginning && repl_could_be_missing) { 578 repl_missing = true; 579 goto hunk_done; 580 } else 581 fatal("unexpected end of hunk " 582 "at line %ld\n", 583 p_input_line); 584 } 585 if (p_end != 0) { 586 if (repl_beginning && repl_could_be_missing) { 587 repl_missing = true; 588 goto hunk_done; 589 } 590 fatal("unexpected *** at line %ld: %s", 591 p_input_line, buf); 592 } 593 context = 0; 594 p_line[p_end] = savestr(buf); 595 if (out_of_mem) { 596 p_end--; 597 return false; 598 } 599 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 600 ; 601 if (!*s) 602 malformed(); 603 if (strnEQ(s, "0,0", 3)) 604 memmove(s, s + 2, strlen(s + 2) + 1); 605 p_first = (LINENUM) atol(s); 606 while (isdigit((unsigned char)*s)) 607 s++; 608 if (*s == ',') { 609 for (; *s && !isdigit((unsigned char)*s); s++) 610 ; 611 if (!*s) 612 malformed(); 613 p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1; 614 } else if (p_first) 615 p_ptrn_lines = 1; 616 else { 617 p_ptrn_lines = 0; 618 p_first = 1; 619 } 620 621 /* we need this much at least */ 622 p_max = p_ptrn_lines + 6; 623 while (p_max >= hunkmax) 624 grow_hunkmax(); 625 p_max = hunkmax; 626 break; 627 case '-': 628 if (buf[1] == '-') { 629 if (repl_beginning || 630 (p_end != p_ptrn_lines + 1 + 631 (p_char[p_end - 1] == '\n'))) { 632 if (p_end == 1) { 633 /* 634 * `old' lines were omitted; 635 * set up to fill them in 636 * from 'new' context lines. 637 */ 638 p_end = p_ptrn_lines + 1; 639 fillsrc = p_end + 1; 640 filldst = 1; 641 fillcnt = p_ptrn_lines; 642 } else { 643 if (repl_beginning) { 644 if (repl_could_be_missing) { 645 repl_missing = true; 646 goto hunk_done; 647 } 648 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 649 p_input_line, p_hunk_beg + repl_beginning); 650 } else { 651 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 652 (p_end <= p_ptrn_lines 653 ? "Premature" 654 : "Overdue"), 655 p_input_line, p_hunk_beg); 656 } 657 } 658 } 659 repl_beginning = p_end; 660 repl_backtrack_position = ftell(pfp); 661 repl_patch_line = p_input_line; 662 p_line[p_end] = savestr(buf); 663 if (out_of_mem) { 664 p_end--; 665 return false; 666 } 667 p_char[p_end] = '='; 668 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 669 ; 670 if (!*s) 671 malformed(); 672 p_newfirst = (LINENUM) atol(s); 673 while (isdigit((unsigned char)*s)) 674 s++; 675 if (*s == ',') { 676 for (; *s && !isdigit((unsigned char)*s); s++) 677 ; 678 if (!*s) 679 malformed(); 680 p_repl_lines = ((LINENUM) atol(s)) - 681 p_newfirst + 1; 682 } else if (p_newfirst) 683 p_repl_lines = 1; 684 else { 685 p_repl_lines = 0; 686 p_newfirst = 1; 687 } 688 p_max = p_repl_lines + p_end; 689 if (p_max > MAXHUNKSIZE) 690 fatal("hunk too large (%ld lines) at line %ld: %s", 691 p_max, p_input_line, buf); 692 while (p_max >= hunkmax) 693 grow_hunkmax(); 694 if (p_repl_lines != ptrn_copiable && 695 (p_context != 0 || p_repl_lines != 1)) 696 repl_could_be_missing = false; 697 break; 698 } 699 goto change_line; 700 case '+': 701 case '!': 702 repl_could_be_missing = false; 703 change_line: 704 if (buf[1] == '\n' && canonicalize) 705 strlcpy(buf + 1, " \n", buf_size - 1); 706 if (!isspace((unsigned char)buf[1]) && buf[1] != '>' && 707 buf[1] != '<' && 708 repl_beginning && repl_could_be_missing) { 709 repl_missing = true; 710 goto hunk_done; 711 } 712 if (context >= 0) { 713 if (context < p_context) 714 p_context = context; 715 context = -1000; 716 } 717 p_line[p_end] = savestr(buf + 2); 718 if (out_of_mem) { 719 p_end--; 720 return false; 721 } 722 if (p_end == p_ptrn_lines) { 723 if (remove_special_line()) { 724 int l; 725 726 l = strlen(p_line[p_end]) - 1; 727 (p_line[p_end])[l] = 0; 728 } 729 } 730 break; 731 case '\t': 732 case '\n': /* assume the 2 spaces got eaten */ 733 if (repl_beginning && repl_could_be_missing && 734 (!ptrn_spaces_eaten || 735 diff_type == NEW_CONTEXT_DIFF)) { 736 repl_missing = true; 737 goto hunk_done; 738 } 739 p_line[p_end] = savestr(buf); 740 if (out_of_mem) { 741 p_end--; 742 return false; 743 } 744 if (p_end != p_ptrn_lines + 1) { 745 ptrn_spaces_eaten |= (repl_beginning != 0); 746 context++; 747 if (!repl_beginning) 748 ptrn_copiable++; 749 p_char[p_end] = ' '; 750 } 751 break; 752 case ' ': 753 if (!isspace((unsigned char)buf[1]) && 754 repl_beginning && repl_could_be_missing) { 755 repl_missing = true; 756 goto hunk_done; 757 } 758 context++; 759 if (!repl_beginning) 760 ptrn_copiable++; 761 p_line[p_end] = savestr(buf + 2); 762 if (out_of_mem) { 763 p_end--; 764 return false; 765 } 766 break; 767 default: 768 if (repl_beginning && repl_could_be_missing) { 769 repl_missing = true; 770 goto hunk_done; 771 } 772 malformed(); 773 } 774 /* set up p_len for strncmp() so we don't have to */ 775 /* assume null termination */ 776 if (p_line[p_end]) 777 p_len[p_end] = strlen(p_line[p_end]); 778 else 779 p_len[p_end] = 0; 780 } 781 782 hunk_done: 783 if (p_end >= 0 && !repl_beginning) 784 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 785 786 if (repl_missing) { 787 788 /* reset state back to just after --- */ 789 p_input_line = repl_patch_line; 790 for (p_end--; p_end > repl_beginning; p_end--) 791 free(p_line[p_end]); 792 fseek(pfp, repl_backtrack_position, SEEK_SET); 793 794 /* redundant 'new' context lines were omitted - set */ 795 /* up to fill them in from the old file context */ 796 if (!p_context && p_repl_lines == 1) { 797 p_repl_lines = 0; 798 p_max--; 799 } 800 fillsrc = 1; 801 filldst = repl_beginning + 1; 802 fillcnt = p_repl_lines; 803 p_end = p_max; 804 } else if (!p_context && fillcnt == 1) { 805 /* the first hunk was a null hunk with no context */ 806 /* and we were expecting one line -- fix it up. */ 807 while (filldst < p_end) { 808 p_line[filldst] = p_line[filldst + 1]; 809 p_char[filldst] = p_char[filldst + 1]; 810 p_len[filldst] = p_len[filldst + 1]; 811 filldst++; 812 } 813 #if 0 814 repl_beginning--; /* this doesn't need to be fixed */ 815 #endif 816 p_end--; 817 p_first++; /* do append rather than insert */ 818 fillcnt = 0; 819 p_ptrn_lines = 0; 820 } 821 if (diff_type == CONTEXT_DIFF && 822 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 823 if (verbose) 824 say("%s\n%s\n%s\n", 825 "(Fascinating--this is really a new-style context diff but without", 826 "the telltale extra asterisks on the *** line that usually indicate", 827 "the new style...)"); 828 diff_type = NEW_CONTEXT_DIFF; 829 } 830 /* if there were omitted context lines, fill them in now */ 831 if (fillcnt) { 832 p_bfake = filldst; /* remember where not to free() */ 833 p_efake = filldst + fillcnt - 1; 834 while (fillcnt-- > 0) { 835 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 836 fillsrc++; 837 if (fillsrc > p_end) 838 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 839 p_hunk_beg); 840 p_line[filldst] = p_line[fillsrc]; 841 p_char[filldst] = p_char[fillsrc]; 842 p_len[filldst] = p_len[fillsrc]; 843 fillsrc++; 844 filldst++; 845 } 846 while (fillsrc <= p_end && fillsrc != repl_beginning && 847 p_char[fillsrc] != ' ') 848 fillsrc++; 849 #ifdef DEBUGGING 850 if (debug & 64) 851 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 852 fillsrc, filldst, repl_beginning, p_end + 1); 853 #endif 854 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 855 malformed(); 856 if (filldst != p_end + 1 && filldst != repl_beginning) 857 malformed(); 858 } 859 if (p_line[p_end] != NULL) { 860 if (remove_special_line()) { 861 p_len[p_end] -= 1; 862 (p_line[p_end])[p_len[p_end]] = 0; 863 } 864 } 865 } else if (diff_type == UNI_DIFF) { 866 LINENUM fillold; /* index of old lines */ 867 LINENUM fillnew; /* index of new lines */ 868 char ch; 869 870 line_beginning = ftell(pfp); /* file pos of the current line */ 871 len = pgets(true); 872 p_input_line++; 873 if (len == 0 || strnNE(buf, "@@ -", 4)) { 874 next_intuit_at(line_beginning, p_input_line); 875 return false; 876 } 877 s = buf + 4; 878 if (!*s) 879 malformed(); 880 p_first = (LINENUM) atol(s); 881 while (isdigit((unsigned char)*s)) 882 s++; 883 if (*s == ',') { 884 p_ptrn_lines = (LINENUM) atol(++s); 885 while (isdigit((unsigned char)*s)) 886 s++; 887 } else 888 p_ptrn_lines = 1; 889 if (*s == ' ') 890 s++; 891 if (*s != '+' || !*++s) 892 malformed(); 893 p_newfirst = (LINENUM) atol(s); 894 while (isdigit((unsigned char)*s)) 895 s++; 896 if (*s == ',') { 897 p_repl_lines = (LINENUM) atol(++s); 898 while (isdigit((unsigned char)*s)) 899 s++; 900 } else 901 p_repl_lines = 1; 902 if (*s == ' ') 903 s++; 904 if (*s != '@') 905 malformed(); 906 if (!p_ptrn_lines) 907 p_first++; /* do append rather than insert */ 908 p_max = p_ptrn_lines + p_repl_lines + 1; 909 while (p_max >= hunkmax) 910 grow_hunkmax(); 911 fillold = 1; 912 fillnew = fillold + p_ptrn_lines; 913 p_end = fillnew + p_repl_lines; 914 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 915 p_first + p_ptrn_lines - 1); 916 p_line[0] = savestr(buf); 917 if (out_of_mem) { 918 p_end = -1; 919 return false; 920 } 921 p_char[0] = '*'; 922 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 923 p_newfirst + p_repl_lines - 1); 924 p_line[fillnew] = savestr(buf); 925 if (out_of_mem) { 926 p_end = 0; 927 return false; 928 } 929 p_char[fillnew++] = '='; 930 p_context = 100; 931 context = 0; 932 p_hunk_beg = p_input_line + 1; 933 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 934 line_beginning = ftell(pfp); 935 len = pgets(true); 936 p_input_line++; 937 if (len == 0) { 938 if (p_max - fillnew < 3) { 939 /* assume blank lines got chopped */ 940 strlcpy(buf, " \n", buf_size); 941 } else { 942 fatal("unexpected end of file in patch\n"); 943 } 944 } 945 if (*buf == '\t' || *buf == '\n') { 946 ch = ' '; /* assume the space got eaten */ 947 s = savestr(buf); 948 } else { 949 ch = *buf; 950 s = savestr(buf + 1); 951 } 952 if (out_of_mem) { 953 while (--fillnew > p_ptrn_lines) 954 free(p_line[fillnew]); 955 p_end = fillold - 1; 956 return false; 957 } 958 switch (ch) { 959 case '-': 960 if (fillold > p_ptrn_lines) { 961 free(s); 962 p_end = fillnew - 1; 963 malformed(); 964 } 965 p_char[fillold] = ch; 966 p_line[fillold] = s; 967 p_len[fillold++] = strlen(s); 968 if (fillold > p_ptrn_lines) { 969 if (remove_special_line()) { 970 p_len[fillold - 1] -= 1; 971 s[p_len[fillold - 1]] = 0; 972 } 973 } 974 break; 975 case '=': 976 ch = ' '; 977 /* FALL THROUGH */ 978 case ' ': 979 if (fillold > p_ptrn_lines) { 980 free(s); 981 while (--fillnew > p_ptrn_lines) 982 free(p_line[fillnew]); 983 p_end = fillold - 1; 984 malformed(); 985 } 986 context++; 987 p_char[fillold] = ch; 988 p_line[fillold] = s; 989 p_len[fillold++] = strlen(s); 990 s = savestr(s); 991 if (out_of_mem) { 992 while (--fillnew > p_ptrn_lines) 993 free(p_line[fillnew]); 994 p_end = fillold - 1; 995 return false; 996 } 997 if (fillold > p_ptrn_lines) { 998 if (remove_special_line()) { 999 p_len[fillold - 1] -= 1; 1000 s[p_len[fillold - 1]] = 0; 1001 } 1002 } 1003 /* FALL THROUGH */ 1004 case '+': 1005 if (fillnew > p_end) { 1006 free(s); 1007 while (--fillnew > p_ptrn_lines) 1008 free(p_line[fillnew]); 1009 p_end = fillold - 1; 1010 malformed(); 1011 } 1012 p_char[fillnew] = ch; 1013 p_line[fillnew] = s; 1014 p_len[fillnew++] = strlen(s); 1015 if (fillold > p_ptrn_lines) { 1016 if (remove_special_line()) { 1017 p_len[fillnew - 1] -= 1; 1018 s[p_len[fillnew - 1]] = 0; 1019 } 1020 } 1021 break; 1022 default: 1023 p_end = fillnew; 1024 malformed(); 1025 } 1026 if (ch != ' ' && context > 0) { 1027 if (context < p_context) 1028 p_context = context; 1029 context = -1000; 1030 } 1031 } /* while */ 1032 } else { /* normal diff--fake it up */ 1033 char hunk_type; 1034 int i; 1035 LINENUM min, max; 1036 1037 line_beginning = ftell(pfp); 1038 p_context = 0; 1039 len = pgets(true); 1040 p_input_line++; 1041 if (len == 0 || !isdigit((unsigned char)*buf)) { 1042 next_intuit_at(line_beginning, p_input_line); 1043 return false; 1044 } 1045 p_first = (LINENUM) atol(buf); 1046 for (s = buf; isdigit((unsigned char)*s); s++) 1047 ; 1048 if (*s == ',') { 1049 p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1; 1050 while (isdigit((unsigned char)*s)) 1051 s++; 1052 } else 1053 p_ptrn_lines = (*s != 'a'); 1054 hunk_type = *s; 1055 if (hunk_type == 'a') 1056 p_first++; /* do append rather than insert */ 1057 min = (LINENUM) atol(++s); 1058 for (; isdigit((unsigned char)*s); s++) 1059 ; 1060 if (*s == ',') 1061 max = (LINENUM) atol(++s); 1062 else 1063 max = min; 1064 if (hunk_type == 'd') 1065 min++; 1066 p_end = p_ptrn_lines + 1 + max - min + 1; 1067 if (p_end > MAXHUNKSIZE) 1068 fatal("hunk too large (%ld lines) at line %ld: %s", 1069 p_end, p_input_line, buf); 1070 while (p_end >= hunkmax) 1071 grow_hunkmax(); 1072 p_newfirst = min; 1073 p_repl_lines = max - min + 1; 1074 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1075 p_first + p_ptrn_lines - 1); 1076 p_line[0] = savestr(buf); 1077 if (out_of_mem) { 1078 p_end = -1; 1079 return false; 1080 } 1081 p_char[0] = '*'; 1082 for (i = 1; i <= p_ptrn_lines; i++) { 1083 len = pgets(true); 1084 p_input_line++; 1085 if (len == 0) 1086 fatal("unexpected end of file in patch at line %ld\n", 1087 p_input_line); 1088 if (*buf != '<') 1089 fatal("< expected at line %ld of patch\n", 1090 p_input_line); 1091 p_line[i] = savestr(buf + 2); 1092 if (out_of_mem) { 1093 p_end = i - 1; 1094 return false; 1095 } 1096 p_len[i] = strlen(p_line[i]); 1097 p_char[i] = '-'; 1098 } 1099 1100 if (remove_special_line()) { 1101 p_len[i - 1] -= 1; 1102 (p_line[i - 1])[p_len[i - 1]] = 0; 1103 } 1104 if (hunk_type == 'c') { 1105 len = pgets(true); 1106 p_input_line++; 1107 if (len == 0) 1108 fatal("unexpected end of file in patch at line %ld\n", 1109 p_input_line); 1110 if (*buf != '-') 1111 fatal("--- expected at line %ld of patch\n", 1112 p_input_line); 1113 } 1114 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1115 p_line[i] = savestr(buf); 1116 if (out_of_mem) { 1117 p_end = i - 1; 1118 return false; 1119 } 1120 p_char[i] = '='; 1121 for (i++; i <= p_end; i++) { 1122 len = pgets(true); 1123 p_input_line++; 1124 if (len == 0) 1125 fatal("unexpected end of file in patch at line %ld\n", 1126 p_input_line); 1127 if (*buf != '>') 1128 fatal("> expected at line %ld of patch\n", 1129 p_input_line); 1130 p_line[i] = savestr(buf + 2); 1131 if (out_of_mem) { 1132 p_end = i - 1; 1133 return false; 1134 } 1135 p_len[i] = strlen(p_line[i]); 1136 p_char[i] = '+'; 1137 } 1138 1139 if (remove_special_line()) { 1140 p_len[i - 1] -= 1; 1141 (p_line[i - 1])[p_len[i - 1]] = 0; 1142 } 1143 } 1144 if (reverse) /* backwards patch? */ 1145 if (!pch_swap()) 1146 say("Not enough memory to swap next hunk!\n"); 1147 #ifdef DEBUGGING 1148 if (debug & 2) { 1149 int i; 1150 char special; 1151 1152 for (i = 0; i <= p_end; i++) { 1153 if (i == p_ptrn_lines) 1154 special = '^'; 1155 else 1156 special = ' '; 1157 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1158 special, p_line[i]); 1159 fflush(stderr); 1160 } 1161 } 1162 #endif 1163 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1164 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1165 return true; 1166 } 1167 1168 /* 1169 * Input a line from the patch file. 1170 * Worry about indentation if do_indent is true. 1171 * The line is read directly into the buf global variable which 1172 * is resized if necessary in order to hold the complete line. 1173 * Returns the number of characters read including the terminating 1174 * '\n', if any. 1175 */ 1176 size_t 1177 pgets(bool do_indent) 1178 { 1179 char *line; 1180 size_t len; 1181 int indent = 0, skipped = 0; 1182 1183 line = fgetln(pfp, &len); 1184 if (line != NULL) { 1185 if (len + 1 > buf_size) { 1186 while (len + 1 > buf_size) 1187 buf_size *= 2; 1188 free(buf); 1189 buf = malloc(buf_size); 1190 if (buf == NULL) 1191 fatal("out of memory\n"); 1192 } 1193 if (do_indent == 1 && p_indent) { 1194 for (; 1195 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1196 line++, skipped++) { 1197 if (*line == '\t') 1198 indent += 8 - (indent %7); 1199 else 1200 indent++; 1201 } 1202 } 1203 strncpy(buf, line, len - skipped); 1204 buf[len - skipped] = '\0'; 1205 } 1206 return len; 1207 } 1208 1209 1210 /* 1211 * Reverse the old and new portions of the current hunk. 1212 */ 1213 bool 1214 pch_swap(void) 1215 { 1216 char **tp_line; /* the text of the hunk */ 1217 short *tp_len; /* length of each line */ 1218 char *tp_char; /* +, -, and ! */ 1219 LINENUM i; 1220 LINENUM n; 1221 bool blankline = false; 1222 char *s; 1223 1224 i = p_first; 1225 p_first = p_newfirst; 1226 p_newfirst = i; 1227 1228 /* make a scratch copy */ 1229 1230 tp_line = p_line; 1231 tp_len = p_len; 1232 tp_char = p_char; 1233 p_line = NULL; /* force set_hunkmax to allocate again */ 1234 p_len = NULL; 1235 p_char = NULL; 1236 set_hunkmax(); 1237 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1238 1239 free(p_line); 1240 p_line = tp_line; 1241 free(p_len); 1242 p_len = tp_len; 1243 free(p_char); 1244 p_char = tp_char; 1245 return false; /* not enough memory to swap hunk! */ 1246 } 1247 /* now turn the new into the old */ 1248 1249 i = p_ptrn_lines + 1; 1250 if (tp_char[i] == '\n') { /* account for possible blank line */ 1251 blankline = true; 1252 i++; 1253 } 1254 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1255 if (p_efake <= i) 1256 n = p_end - i + 1; 1257 else 1258 n = -i; 1259 p_efake += n; 1260 p_bfake += n; 1261 } 1262 for (n = 0; i <= p_end; i++, n++) { 1263 p_line[n] = tp_line[i]; 1264 p_char[n] = tp_char[i]; 1265 if (p_char[n] == '+') 1266 p_char[n] = '-'; 1267 p_len[n] = tp_len[i]; 1268 } 1269 if (blankline) { 1270 i = p_ptrn_lines + 1; 1271 p_line[n] = tp_line[i]; 1272 p_char[n] = tp_char[i]; 1273 p_len[n] = tp_len[i]; 1274 n++; 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 p_char[0] = '*'; 1280 for (s = p_line[0]; *s; s++) 1281 if (*s == '-') 1282 *s = '*'; 1283 1284 /* now turn the old into the new */ 1285 1286 if (p_char[0] != '*') 1287 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1288 p_input_line, p_char[0]); 1289 tp_char[0] = '='; 1290 for (s = tp_line[0]; *s; s++) 1291 if (*s == '*') 1292 *s = '-'; 1293 for (i = 0; n <= p_end; i++, n++) { 1294 p_line[n] = tp_line[i]; 1295 p_char[n] = tp_char[i]; 1296 if (p_char[n] == '-') 1297 p_char[n] = '+'; 1298 p_len[n] = tp_len[i]; 1299 } 1300 1301 if (i != p_ptrn_lines + 1) 1302 fatal("Malformed patch at line %ld: expected %ld lines, " 1303 "got %ld\n", 1304 p_input_line, p_ptrn_lines + 1, i); 1305 1306 i = p_ptrn_lines; 1307 p_ptrn_lines = p_repl_lines; 1308 p_repl_lines = i; 1309 1310 free(tp_line); 1311 free(tp_len); 1312 free(tp_char); 1313 1314 return true; 1315 } 1316 1317 /* 1318 * Return the specified line position in the old file of the old context. 1319 */ 1320 LINENUM 1321 pch_first(void) 1322 { 1323 return p_first; 1324 } 1325 1326 /* 1327 * Return the number of lines of old context. 1328 */ 1329 LINENUM 1330 pch_ptrn_lines(void) 1331 { 1332 return p_ptrn_lines; 1333 } 1334 1335 /* 1336 * Return the probable line position in the new file of the first line. 1337 */ 1338 LINENUM 1339 pch_newfirst(void) 1340 { 1341 return p_newfirst; 1342 } 1343 1344 /* 1345 * Return the number of lines in the replacement text including context. 1346 */ 1347 LINENUM 1348 pch_repl_lines(void) 1349 { 1350 return p_repl_lines; 1351 } 1352 1353 /* 1354 * Return the number of lines in the whole hunk. 1355 */ 1356 LINENUM 1357 pch_end(void) 1358 { 1359 return p_end; 1360 } 1361 1362 /* 1363 * Return the number of context lines before the first changed line. 1364 */ 1365 LINENUM 1366 pch_context(void) 1367 { 1368 return p_context; 1369 } 1370 1371 /* 1372 * Return the length of a particular patch line. 1373 */ 1374 short 1375 pch_line_len(LINENUM line) 1376 { 1377 return p_len[line]; 1378 } 1379 1380 /* 1381 * Return the control character (+, -, *, !, etc) for a patch line. 1382 */ 1383 char 1384 pch_char(LINENUM line) 1385 { 1386 return p_char[line]; 1387 } 1388 1389 /* 1390 * Return a pointer to a particular patch line. 1391 */ 1392 char * 1393 pfetch(LINENUM line) 1394 { 1395 return p_line[line]; 1396 } 1397 1398 /* 1399 * Return where in the patch file this hunk began, for error messages. 1400 */ 1401 LINENUM 1402 pch_hunk_beg(void) 1403 { 1404 return p_hunk_beg; 1405 } 1406 1407 /* 1408 * Apply an ed script by feeding ed itself. 1409 */ 1410 void 1411 do_ed_script(void) 1412 { 1413 char *t; 1414 long beginning_of_this_line; 1415 FILE *pipefp = NULL; 1416 1417 if (!skip_rest_of_patch) { 1418 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1419 unlink(TMPOUTNAME); 1420 fatal("can't create temp file %s", TMPOUTNAME); 1421 } 1422 snprintf(buf, buf_size, "%s%s%s", _PATH_ED, 1423 verbose ? " " : " -s ", TMPOUTNAME); 1424 pipefp = popen(buf, "w"); 1425 } 1426 for (;;) { 1427 beginning_of_this_line = ftell(pfp); 1428 if (pgets(true) == 0) { 1429 next_intuit_at(beginning_of_this_line, p_input_line); 1430 break; 1431 } 1432 p_input_line++; 1433 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1434 ; 1435 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1436 if (isdigit((unsigned char)*buf) && (*t == 'a' || *t == 'c' || 1437 *t == 'd' || *t == 'i' || *t == 's')) { 1438 if (pipefp != NULL) 1439 fputs(buf, pipefp); 1440 if (*t != 'd') { 1441 while (pgets(true)) { 1442 p_input_line++; 1443 if (pipefp != NULL) 1444 fputs(buf, pipefp); 1445 if (strEQ(buf, ".\n")) 1446 break; 1447 } 1448 } 1449 } else { 1450 next_intuit_at(beginning_of_this_line, p_input_line); 1451 break; 1452 } 1453 } 1454 if (pipefp == NULL) 1455 return; 1456 fprintf(pipefp, "w\n"); 1457 fprintf(pipefp, "q\n"); 1458 fflush(pipefp); 1459 pclose(pipefp); 1460 ignore_signals(); 1461 if (!check_only) { 1462 if (move_file(TMPOUTNAME, outname) < 0) { 1463 toutkeep = true; 1464 chmod(TMPOUTNAME, filemode); 1465 } else 1466 chmod(outname, filemode); 1467 } 1468 set_signals(1); 1469 } 1470 1471 /* 1472 * Choose the name of the file to be patched based on POSIX rules. 1473 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1474 * if the user specified --posix or set POSIXLY_CORRECT. 1475 */ 1476 static char * 1477 posix_name(const struct file_name *names, bool assume_exists) 1478 { 1479 char *path = NULL; 1480 int i; 1481 1482 /* 1483 * POSIX states that the filename will be chosen from one 1484 * of the old, new and index names (in that order) if 1485 * the file exists relative to CWD after -p stripping. 1486 */ 1487 for (i = 0; i < MAX_FILE; i++) { 1488 if (names[i].path != NULL && names[i].exists) { 1489 path = names[i].path; 1490 break; 1491 } 1492 } 1493 if (path == NULL && !assume_exists) { 1494 /* 1495 * No files found, look for something we can checkout from 1496 * RCS/SCCS dirs. Same order as above. 1497 */ 1498 for (i = 0; i < MAX_FILE; i++) { 1499 if (names[i].path != NULL && 1500 (path = checked_in(names[i].path)) != NULL) 1501 break; 1502 } 1503 /* 1504 * Still no match? Check to see if the diff could be creating 1505 * a new file. 1506 */ 1507 if (path == NULL && ok_to_create_file && 1508 names[NEW_FILE].path != NULL) 1509 path = names[NEW_FILE].path; 1510 } 1511 1512 return path ? savestr(path) : NULL; 1513 } 1514 1515 /* 1516 * Choose the name of the file to be patched based the "best" one 1517 * available. 1518 */ 1519 static char * 1520 best_name(const struct file_name *names, bool assume_exists) 1521 { 1522 size_t min_components, min_baselen, min_len, tmp; 1523 char *best = NULL; 1524 int i; 1525 1526 /* 1527 * The "best" name is the one with the fewest number of path 1528 * components, the shortest basename length, and the shortest 1529 * overall length (in that order). We only use the Index: file 1530 * if neither of the old or new files could be intuited from 1531 * the diff header. 1532 */ 1533 min_components = min_baselen = min_len = SIZE_MAX; 1534 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1535 if (names[i].path == NULL || 1536 (!names[i].exists && !assume_exists)) 1537 continue; 1538 if ((tmp = num_components(names[i].path)) > min_components) 1539 continue; 1540 if (tmp < min_components) { 1541 min_components = tmp; 1542 best = names[i].path; 1543 } 1544 if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1545 continue; 1546 if (tmp < min_baselen) { 1547 min_baselen = tmp; 1548 best = names[i].path; 1549 } 1550 if ((tmp = strlen(names[i].path)) > min_len) 1551 continue; 1552 min_len = tmp; 1553 best = names[i].path; 1554 } 1555 if (best == NULL) { 1556 /* 1557 * No files found, look for something we can checkout from 1558 * RCS/SCCS dirs. Logic is identical to that above... 1559 */ 1560 min_components = min_baselen = min_len = SIZE_MAX; 1561 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1562 if (names[i].path == NULL || 1563 checked_in(names[i].path) == NULL) 1564 continue; 1565 if ((tmp = num_components(names[i].path)) > min_components) 1566 continue; 1567 min_components = tmp; 1568 if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1569 continue; 1570 min_baselen = tmp; 1571 if ((tmp = strlen(names[i].path)) > min_len) 1572 continue; 1573 min_len = tmp; 1574 best = names[i].path; 1575 } 1576 /* 1577 * Still no match? Check to see if the diff could be creating 1578 * a new file. 1579 */ 1580 if (best == NULL && ok_to_create_file && 1581 names[NEW_FILE].path != NULL) 1582 best = names[NEW_FILE].path; 1583 } 1584 1585 return best ? savestr(best) : NULL; 1586 } 1587 1588 static size_t 1589 num_components(const char *path) 1590 { 1591 size_t n; 1592 const char *cp; 1593 1594 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1595 while (*cp == '/') 1596 cp++; /* skip consecutive slashes */ 1597 } 1598 return n; 1599 } 1600