1 /* $OpenBSD: pch.c,v 1.38 2009/10/27 23:59:41 deraadt Exp $ */ 2 3 /* 4 * patch - a program to apply diffs to original files 5 * 6 * Copyright 1986, Larry Wall 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following condition is met: 10 * 1. Redistributions of source code must retain the above copyright notice, 11 * this condition and the following disclaimer. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 17 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 26 * behaviour 27 */ 28 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 32 #include <ctype.h> 33 #include <libgen.h> 34 #include <limits.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 40 #include "common.h" 41 #include "util.h" 42 #include "pch.h" 43 #include "pathnames.h" 44 45 /* Patch (diff listing) abstract type. */ 46 47 static long p_filesize; /* size of the patch file */ 48 static LINENUM p_first; /* 1st line number */ 49 static LINENUM p_newfirst; /* 1st line number of replacement */ 50 static LINENUM p_ptrn_lines; /* # lines in pattern */ 51 static LINENUM p_repl_lines; /* # lines in replacement text */ 52 static LINENUM p_end = -1; /* last line in hunk */ 53 static LINENUM p_max; /* max allowed value of p_end */ 54 static LINENUM p_context = 3; /* # of context lines */ 55 static LINENUM p_input_line = 0; /* current line # from patch file */ 56 static char **p_line = NULL;/* the text of the hunk */ 57 static short *p_len = NULL; /* length of each line */ 58 static char *p_char = NULL; /* +, -, and ! */ 59 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 60 static int p_indent; /* indent to patch */ 61 static LINENUM p_base; /* where to intuit this time */ 62 static LINENUM p_bline; /* line # of p_base */ 63 static LINENUM p_start; /* where intuit found a patch */ 64 static LINENUM p_sline; /* and the line number for it */ 65 static LINENUM p_hunk_beg; /* line number of current hunk */ 66 static LINENUM p_efake = -1; /* end of faked up lines--don't free */ 67 static LINENUM p_bfake = -1; /* beg of faked up lines */ 68 static FILE *pfp = NULL; /* patch file pointer */ 69 static char *bestguess = NULL; /* guess at correct filename */ 70 71 static void grow_hunkmax(void); 72 static int intuit_diff_type(void); 73 static void next_intuit_at(LINENUM, LINENUM); 74 static void skip_to(LINENUM, LINENUM); 75 static char *pgets(char *, int, FILE *); 76 static char *best_name(const struct file_name *, bool); 77 static char *posix_name(const struct file_name *, bool); 78 static size_t num_components(const char *); 79 80 /* 81 * Prepare to look for the next patch in the patch file. 82 */ 83 void 84 re_patch(void) 85 { 86 p_first = 0; 87 p_newfirst = 0; 88 p_ptrn_lines = 0; 89 p_repl_lines = 0; 90 p_end = (LINENUM) - 1; 91 p_max = 0; 92 p_indent = 0; 93 } 94 95 /* 96 * Open the patch file at the beginning of time. 97 */ 98 void 99 open_patch_file(const char *filename) 100 { 101 struct stat filestat; 102 103 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 104 pfp = fopen(TMPPATNAME, "w"); 105 if (pfp == NULL) 106 pfatal("can't create %s", TMPPATNAME); 107 while (fgets(buf, sizeof buf, stdin) != NULL) 108 fputs(buf, pfp); 109 fclose(pfp); 110 filename = TMPPATNAME; 111 } 112 pfp = fopen(filename, "r"); 113 if (pfp == NULL) 114 pfatal("patch file %s not found", filename); 115 fstat(fileno(pfp), &filestat); 116 p_filesize = filestat.st_size; 117 next_intuit_at(0L, 1L); /* start at the beginning */ 118 set_hunkmax(); 119 } 120 121 /* 122 * Make sure our dynamically realloced tables are malloced to begin with. 123 */ 124 void 125 set_hunkmax(void) 126 { 127 if (p_line == NULL) 128 p_line = calloc((size_t) hunkmax, sizeof(char *)); 129 if (p_len == NULL) 130 p_len = calloc((size_t) hunkmax, sizeof(short)); 131 if (p_char == NULL) 132 p_char = calloc((size_t) hunkmax, sizeof(char)); 133 } 134 135 /* 136 * Enlarge the arrays containing the current hunk of patch. 137 */ 138 static void 139 grow_hunkmax(void) 140 { 141 int new_hunkmax; 142 char **new_p_line; 143 short *new_p_len; 144 char *new_p_char; 145 146 new_hunkmax = hunkmax * 2; 147 148 if (p_line == NULL || p_len == NULL || p_char == NULL) 149 fatal("Internal memory allocation error\n"); 150 151 new_p_line = realloc(p_line, new_hunkmax * sizeof(char *)); 152 if (new_p_line == NULL) 153 free(p_line); 154 155 new_p_len = realloc(p_len, new_hunkmax * sizeof(short)); 156 if (new_p_len == NULL) 157 free(p_len); 158 159 new_p_char = realloc(p_char, new_hunkmax * sizeof(char)); 160 if (new_p_char == NULL) 161 free(p_char); 162 163 p_char = new_p_char; 164 p_len = new_p_len; 165 p_line = new_p_line; 166 167 if (p_line != NULL && p_len != NULL && p_char != NULL) { 168 hunkmax = new_hunkmax; 169 return; 170 } 171 172 if (!using_plan_a) 173 fatal("out of memory\n"); 174 out_of_mem = true; /* whatever is null will be allocated again */ 175 /* from within plan_a(), of all places */ 176 } 177 178 /* True if the remainder of the patch file contains a diff of some sort. */ 179 180 bool 181 there_is_another_patch(void) 182 { 183 bool exists = false; 184 185 if (p_base != 0L && p_base >= p_filesize) { 186 if (verbose) 187 say("done\n"); 188 return false; 189 } 190 if (verbose) 191 say("Hmm..."); 192 diff_type = intuit_diff_type(); 193 if (!diff_type) { 194 if (p_base != 0L) { 195 if (verbose) 196 say(" Ignoring the trailing garbage.\ndone\n"); 197 } else 198 say(" I can't seem to find a patch in there anywhere.\n"); 199 return false; 200 } 201 if (verbose) 202 say(" %sooks like %s to me...\n", 203 (p_base == 0L ? "L" : "The next patch l"), 204 diff_type == UNI_DIFF ? "a unified diff" : 205 diff_type == CONTEXT_DIFF ? "a context diff" : 206 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 207 diff_type == NORMAL_DIFF ? "a normal diff" : 208 "an ed script"); 209 if (p_indent && verbose) 210 say("(Patch is indented %d space%s.)\n", p_indent, 211 p_indent == 1 ? "" : "s"); 212 skip_to(p_start, p_sline); 213 while (filearg[0] == NULL) { 214 if (force || batch) { 215 say("No file to patch. Skipping...\n"); 216 filearg[0] = savestr(bestguess); 217 skip_rest_of_patch = true; 218 return true; 219 } 220 ask("File to patch: "); 221 if (*buf != '\n') { 222 free(bestguess); 223 bestguess = savestr(buf); 224 filearg[0] = fetchname(buf, &exists, 0); 225 } 226 if (!exists) { 227 ask("No file found--skip this patch? [n] "); 228 if (*buf != 'y') 229 continue; 230 if (verbose) 231 say("Skipping patch...\n"); 232 free(filearg[0]); 233 filearg[0] = fetchname(bestguess, &exists, 0); 234 skip_rest_of_patch = true; 235 return true; 236 } 237 } 238 return true; 239 } 240 241 /* Determine what kind of diff is in the remaining part of the patch file. */ 242 243 static int 244 intuit_diff_type(void) 245 { 246 long this_line = 0, previous_line; 247 long first_command_line = -1; 248 LINENUM fcl_line = -1; 249 bool last_line_was_command = false, this_is_a_command = false; 250 bool stars_last_line = false, stars_this_line = false; 251 char *s, *t; 252 int indent, retval; 253 struct file_name names[MAX_FILE]; 254 255 memset(names, 0, sizeof(names)); 256 ok_to_create_file = false; 257 fseek(pfp, p_base, SEEK_SET); 258 p_input_line = p_bline - 1; 259 for (;;) { 260 previous_line = this_line; 261 last_line_was_command = this_is_a_command; 262 stars_last_line = stars_this_line; 263 this_line = ftell(pfp); 264 indent = 0; 265 p_input_line++; 266 if (fgets(buf, sizeof buf, pfp) == NULL) { 267 if (first_command_line >= 0L) { 268 /* nothing but deletes!? */ 269 p_start = first_command_line; 270 p_sline = fcl_line; 271 retval = ED_DIFF; 272 goto scan_exit; 273 } else { 274 p_start = this_line; 275 p_sline = p_input_line; 276 retval = 0; 277 goto scan_exit; 278 } 279 } 280 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 281 if (*s == '\t') 282 indent += 8 - (indent % 8); 283 else 284 indent++; 285 } 286 for (t = s; isdigit(*t) || *t == ','; t++) 287 ; 288 this_is_a_command = (isdigit(*s) && 289 (*t == 'd' || *t == 'c' || *t == 'a')); 290 if (first_command_line < 0L && this_is_a_command) { 291 first_command_line = this_line; 292 fcl_line = p_input_line; 293 p_indent = indent; /* assume this for now */ 294 } 295 if (!stars_last_line && strnEQ(s, "*** ", 4)) 296 names[OLD_FILE].path = fetchname(s + 4, 297 &names[OLD_FILE].exists, strippath); 298 else if (strnEQ(s, "--- ", 4)) 299 names[NEW_FILE].path = fetchname(s + 4, 300 &names[NEW_FILE].exists, strippath); 301 else if (strnEQ(s, "+++ ", 4)) 302 /* pretend it is the old name */ 303 names[OLD_FILE].path = fetchname(s + 4, 304 &names[OLD_FILE].exists, strippath); 305 else if (strnEQ(s, "Index:", 6)) 306 names[INDEX_FILE].path = fetchname(s + 6, 307 &names[INDEX_FILE].exists, strippath); 308 else if (strnEQ(s, "Prereq:", 7)) { 309 for (t = s + 7; isspace(*t); t++) 310 ; 311 revision = savestr(t); 312 for (t = revision; *t && !isspace(*t); t++) 313 ; 314 *t = '\0'; 315 if (*revision == '\0') { 316 free(revision); 317 revision = NULL; 318 } 319 } 320 if ((!diff_type || diff_type == ED_DIFF) && 321 first_command_line >= 0L && 322 strEQ(s, ".\n")) { 323 p_indent = indent; 324 p_start = first_command_line; 325 p_sline = fcl_line; 326 retval = ED_DIFF; 327 goto scan_exit; 328 } 329 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 330 if (strnEQ(s + 4, "0,0", 3)) 331 ok_to_create_file = true; 332 p_indent = indent; 333 p_start = this_line; 334 p_sline = p_input_line; 335 retval = UNI_DIFF; 336 goto scan_exit; 337 } 338 stars_this_line = strnEQ(s, "********", 8); 339 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 340 strnEQ(s, "*** ", 4)) { 341 if (atol(s + 4) == 0) 342 ok_to_create_file = true; 343 /* 344 * If this is a new context diff the character just 345 * before the newline is a '*'. 346 */ 347 while (*s != '\n') 348 s++; 349 p_indent = indent; 350 p_start = previous_line; 351 p_sline = p_input_line - 1; 352 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 353 goto scan_exit; 354 } 355 if ((!diff_type || diff_type == NORMAL_DIFF) && 356 last_line_was_command && 357 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 358 p_start = previous_line; 359 p_sline = p_input_line - 1; 360 p_indent = indent; 361 retval = NORMAL_DIFF; 362 goto scan_exit; 363 } 364 } 365 scan_exit: 366 if (retval == UNI_DIFF) { 367 /* unswap old and new */ 368 struct file_name tmp = names[OLD_FILE]; 369 names[OLD_FILE] = names[NEW_FILE]; 370 names[NEW_FILE] = tmp; 371 } 372 if (filearg[0] == NULL) { 373 if (posix) 374 filearg[0] = posix_name(names, ok_to_create_file); 375 else { 376 /* Ignore the Index: name for context diffs, like GNU */ 377 if (names[OLD_FILE].path != NULL || 378 names[NEW_FILE].path != NULL) { 379 free(names[INDEX_FILE].path); 380 names[INDEX_FILE].path = NULL; 381 } 382 filearg[0] = best_name(names, ok_to_create_file); 383 } 384 } 385 386 free(bestguess); 387 bestguess = NULL; 388 if (filearg[0] != NULL) 389 bestguess = savestr(filearg[0]); 390 else if (!ok_to_create_file) { 391 /* 392 * We don't want to create a new file but we need a 393 * filename to set bestguess. Avoid setting filearg[0] 394 * so the file is not created automatically. 395 */ 396 if (posix) 397 bestguess = posix_name(names, true); 398 else 399 bestguess = best_name(names, true); 400 } 401 free(names[OLD_FILE].path); 402 free(names[NEW_FILE].path); 403 free(names[INDEX_FILE].path); 404 return retval; 405 } 406 407 /* 408 * Remember where this patch ends so we know where to start up again. 409 */ 410 static void 411 next_intuit_at(LINENUM file_pos, LINENUM file_line) 412 { 413 p_base = file_pos; 414 p_bline = file_line; 415 } 416 417 /* 418 * Basically a verbose fseek() to the actual diff listing. 419 */ 420 static void 421 skip_to(LINENUM file_pos, LINENUM file_line) 422 { 423 char *ret; 424 425 if (p_base > file_pos) 426 fatal("Internal error: seek %ld>%ld\n", p_base, file_pos); 427 if (verbose && p_base < file_pos) { 428 fseek(pfp, p_base, SEEK_SET); 429 say("The text leading up to this was:\n--------------------------\n"); 430 while (ftell(pfp) < file_pos) { 431 ret = fgets(buf, sizeof buf, pfp); 432 if (ret == NULL) 433 fatal("Unexpected end of file\n"); 434 say("|%s", buf); 435 } 436 say("--------------------------\n"); 437 } else 438 fseek(pfp, file_pos, SEEK_SET); 439 p_input_line = file_line - 1; 440 } 441 442 /* Make this a function for better debugging. */ 443 static void 444 malformed(void) 445 { 446 fatal("malformed patch at line %ld: %s", p_input_line, buf); 447 /* about as informative as "Syntax error" in C */ 448 } 449 450 /* 451 * True if the line has been discarded (i.e. it is a line saying 452 * "\ No newline at end of file".) 453 */ 454 static bool 455 remove_special_line(void) 456 { 457 int c; 458 459 c = fgetc(pfp); 460 if (c == '\\') { 461 do { 462 c = fgetc(pfp); 463 } while (c != EOF && c != '\n'); 464 465 return true; 466 } 467 if (c != EOF) 468 fseek(pfp, -1L, SEEK_CUR); 469 470 return false; 471 } 472 473 /* 474 * True if there is more of the current diff listing to process. 475 */ 476 bool 477 another_hunk(void) 478 { 479 long line_beginning; /* file pos of the current line */ 480 LINENUM repl_beginning; /* index of --- line */ 481 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 482 LINENUM fillsrc; /* index of first line to copy */ 483 LINENUM filldst; /* index of first missing line */ 484 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 485 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 486 bool repl_missing; /* we are now backtracking */ 487 long repl_backtrack_position; /* file pos of first repl line */ 488 LINENUM repl_patch_line; /* input line number for same */ 489 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 490 char *s, *ret; 491 int context = 0; 492 493 while (p_end >= 0) { 494 if (p_end == p_efake) 495 p_end = p_bfake; /* don't free twice */ 496 else 497 free(p_line[p_end]); 498 p_end--; 499 } 500 p_efake = -1; 501 502 p_max = hunkmax; /* gets reduced when --- found */ 503 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 504 line_beginning = ftell(pfp); 505 repl_beginning = 0; 506 fillcnt = 0; 507 ptrn_spaces_eaten = false; 508 repl_could_be_missing = true; 509 repl_missing = false; 510 repl_backtrack_position = 0; 511 ptrn_copiable = 0; 512 513 ret = pgets(buf, sizeof buf, pfp); 514 p_input_line++; 515 if (ret == NULL || strnNE(buf, "********", 8)) { 516 next_intuit_at(line_beginning, p_input_line); 517 return false; 518 } 519 p_context = 100; 520 p_hunk_beg = p_input_line + 1; 521 while (p_end < p_max) { 522 line_beginning = ftell(pfp); 523 ret = pgets(buf, sizeof buf, pfp); 524 p_input_line++; 525 if (ret == NULL) { 526 if (p_max - p_end < 4) { 527 /* assume blank lines got chopped */ 528 strlcpy(buf, " \n", sizeof buf); 529 } else { 530 if (repl_beginning && repl_could_be_missing) { 531 repl_missing = true; 532 goto hunk_done; 533 } 534 fatal("unexpected end of file in patch\n"); 535 } 536 } 537 p_end++; 538 if (p_end >= hunkmax) 539 fatal("Internal error: hunk larger than hunk " 540 "buffer size"); 541 p_char[p_end] = *buf; 542 p_line[p_end] = NULL; 543 switch (*buf) { 544 case '*': 545 if (strnEQ(buf, "********", 8)) { 546 if (repl_beginning && repl_could_be_missing) { 547 repl_missing = true; 548 goto hunk_done; 549 } else 550 fatal("unexpected end of hunk " 551 "at line %ld\n", 552 p_input_line); 553 } 554 if (p_end != 0) { 555 if (repl_beginning && repl_could_be_missing) { 556 repl_missing = true; 557 goto hunk_done; 558 } 559 fatal("unexpected *** at line %ld: %s", 560 p_input_line, buf); 561 } 562 context = 0; 563 p_line[p_end] = savestr(buf); 564 if (out_of_mem) { 565 p_end--; 566 return false; 567 } 568 for (s = buf; *s && !isdigit(*s); s++) 569 ; 570 if (!*s) 571 malformed(); 572 if (strnEQ(s, "0,0", 3)) 573 memmove(s, s + 2, strlen(s + 2) + 1); 574 p_first = (LINENUM) atol(s); 575 while (isdigit(*s)) 576 s++; 577 if (*s == ',') { 578 for (; *s && !isdigit(*s); s++) 579 ; 580 if (!*s) 581 malformed(); 582 p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1; 583 } else if (p_first) 584 p_ptrn_lines = 1; 585 else { 586 p_ptrn_lines = 0; 587 p_first = 1; 588 } 589 590 /* we need this much at least */ 591 p_max = p_ptrn_lines + 6; 592 while (p_max >= hunkmax) 593 grow_hunkmax(); 594 p_max = hunkmax; 595 break; 596 case '-': 597 if (buf[1] == '-') { 598 if (repl_beginning || 599 (p_end != p_ptrn_lines + 1 + 600 (p_char[p_end - 1] == '\n'))) { 601 if (p_end == 1) { 602 /* 603 * `old' lines were omitted; 604 * set up to fill them in 605 * from 'new' context lines. 606 */ 607 p_end = p_ptrn_lines + 1; 608 fillsrc = p_end + 1; 609 filldst = 1; 610 fillcnt = p_ptrn_lines; 611 } else { 612 if (repl_beginning) { 613 if (repl_could_be_missing) { 614 repl_missing = true; 615 goto hunk_done; 616 } 617 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 618 p_input_line, p_hunk_beg + repl_beginning); 619 } else { 620 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 621 (p_end <= p_ptrn_lines 622 ? "Premature" 623 : "Overdue"), 624 p_input_line, p_hunk_beg); 625 } 626 } 627 } 628 repl_beginning = p_end; 629 repl_backtrack_position = ftell(pfp); 630 repl_patch_line = p_input_line; 631 p_line[p_end] = savestr(buf); 632 if (out_of_mem) { 633 p_end--; 634 return false; 635 } 636 p_char[p_end] = '='; 637 for (s = buf; *s && !isdigit(*s); s++) 638 ; 639 if (!*s) 640 malformed(); 641 p_newfirst = (LINENUM) atol(s); 642 while (isdigit(*s)) 643 s++; 644 if (*s == ',') { 645 for (; *s && !isdigit(*s); s++) 646 ; 647 if (!*s) 648 malformed(); 649 p_repl_lines = ((LINENUM) atol(s)) - 650 p_newfirst + 1; 651 } else if (p_newfirst) 652 p_repl_lines = 1; 653 else { 654 p_repl_lines = 0; 655 p_newfirst = 1; 656 } 657 p_max = p_repl_lines + p_end; 658 if (p_max > MAXHUNKSIZE) 659 fatal("hunk too large (%ld lines) at line %ld: %s", 660 p_max, p_input_line, buf); 661 while (p_max >= hunkmax) 662 grow_hunkmax(); 663 if (p_repl_lines != ptrn_copiable && 664 (p_context != 0 || p_repl_lines != 1)) 665 repl_could_be_missing = false; 666 break; 667 } 668 goto change_line; 669 case '+': 670 case '!': 671 repl_could_be_missing = false; 672 change_line: 673 if (buf[1] == '\n' && canonicalize) 674 strlcpy(buf + 1, " \n", sizeof buf - 1); 675 if (!isspace(buf[1]) && buf[1] != '>' && 676 buf[1] != '<' && 677 repl_beginning && repl_could_be_missing) { 678 repl_missing = true; 679 goto hunk_done; 680 } 681 if (context >= 0) { 682 if (context < p_context) 683 p_context = context; 684 context = -1000; 685 } 686 p_line[p_end] = savestr(buf + 2); 687 if (out_of_mem) { 688 p_end--; 689 return false; 690 } 691 if (p_end == p_ptrn_lines) { 692 if (remove_special_line()) { 693 int len; 694 695 len = strlen(p_line[p_end]) - 1; 696 (p_line[p_end])[len] = 0; 697 } 698 } 699 break; 700 case '\t': 701 case '\n': /* assume the 2 spaces got eaten */ 702 if (repl_beginning && repl_could_be_missing && 703 (!ptrn_spaces_eaten || 704 diff_type == NEW_CONTEXT_DIFF)) { 705 repl_missing = true; 706 goto hunk_done; 707 } 708 p_line[p_end] = savestr(buf); 709 if (out_of_mem) { 710 p_end--; 711 return false; 712 } 713 if (p_end != p_ptrn_lines + 1) { 714 ptrn_spaces_eaten |= (repl_beginning != 0); 715 context++; 716 if (!repl_beginning) 717 ptrn_copiable++; 718 p_char[p_end] = ' '; 719 } 720 break; 721 case ' ': 722 if (!isspace(buf[1]) && 723 repl_beginning && repl_could_be_missing) { 724 repl_missing = true; 725 goto hunk_done; 726 } 727 context++; 728 if (!repl_beginning) 729 ptrn_copiable++; 730 p_line[p_end] = savestr(buf + 2); 731 if (out_of_mem) { 732 p_end--; 733 return false; 734 } 735 break; 736 default: 737 if (repl_beginning && repl_could_be_missing) { 738 repl_missing = true; 739 goto hunk_done; 740 } 741 malformed(); 742 } 743 /* set up p_len for strncmp() so we don't have to */ 744 /* assume null termination */ 745 if (p_line[p_end]) 746 p_len[p_end] = strlen(p_line[p_end]); 747 else 748 p_len[p_end] = 0; 749 } 750 751 hunk_done: 752 if (p_end >= 0 && !repl_beginning) 753 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 754 755 if (repl_missing) { 756 757 /* reset state back to just after --- */ 758 p_input_line = repl_patch_line; 759 for (p_end--; p_end > repl_beginning; p_end--) 760 free(p_line[p_end]); 761 fseek(pfp, repl_backtrack_position, SEEK_SET); 762 763 /* redundant 'new' context lines were omitted - set */ 764 /* up to fill them in from the old file context */ 765 if (!p_context && p_repl_lines == 1) { 766 p_repl_lines = 0; 767 p_max--; 768 } 769 fillsrc = 1; 770 filldst = repl_beginning + 1; 771 fillcnt = p_repl_lines; 772 p_end = p_max; 773 } else if (!p_context && fillcnt == 1) { 774 /* the first hunk was a null hunk with no context */ 775 /* and we were expecting one line -- fix it up. */ 776 while (filldst < p_end) { 777 p_line[filldst] = p_line[filldst + 1]; 778 p_char[filldst] = p_char[filldst + 1]; 779 p_len[filldst] = p_len[filldst + 1]; 780 filldst++; 781 } 782 #if 0 783 repl_beginning--; /* this doesn't need to be fixed */ 784 #endif 785 p_end--; 786 p_first++; /* do append rather than insert */ 787 fillcnt = 0; 788 p_ptrn_lines = 0; 789 } 790 if (diff_type == CONTEXT_DIFF && 791 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 792 if (verbose) 793 say("%s\n%s\n%s\n", 794 "(Fascinating--this is really a new-style context diff but without", 795 "the telltale extra asterisks on the *** line that usually indicate", 796 "the new style...)"); 797 diff_type = NEW_CONTEXT_DIFF; 798 } 799 /* if there were omitted context lines, fill them in now */ 800 if (fillcnt) { 801 p_bfake = filldst; /* remember where not to free() */ 802 p_efake = filldst + fillcnt - 1; 803 while (fillcnt-- > 0) { 804 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 805 fillsrc++; 806 if (fillsrc > p_end) 807 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 808 p_hunk_beg); 809 p_line[filldst] = p_line[fillsrc]; 810 p_char[filldst] = p_char[fillsrc]; 811 p_len[filldst] = p_len[fillsrc]; 812 fillsrc++; 813 filldst++; 814 } 815 while (fillsrc <= p_end && fillsrc != repl_beginning && 816 p_char[fillsrc] != ' ') 817 fillsrc++; 818 #ifdef DEBUGGING 819 if (debug & 64) 820 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 821 fillsrc, filldst, repl_beginning, p_end + 1); 822 #endif 823 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 824 malformed(); 825 if (filldst != p_end + 1 && filldst != repl_beginning) 826 malformed(); 827 } 828 if (p_line[p_end] != NULL) { 829 if (remove_special_line()) { 830 p_len[p_end] -= 1; 831 (p_line[p_end])[p_len[p_end]] = 0; 832 } 833 } 834 } else if (diff_type == UNI_DIFF) { 835 long line_beginning = ftell(pfp); /* file pos of the current line */ 836 LINENUM fillsrc; /* index of old lines */ 837 LINENUM filldst; /* index of new lines */ 838 char ch; 839 840 ret = pgets(buf, sizeof buf, pfp); 841 p_input_line++; 842 if (ret == NULL || strnNE(buf, "@@ -", 4)) { 843 next_intuit_at(line_beginning, p_input_line); 844 return false; 845 } 846 s = buf + 4; 847 if (!*s) 848 malformed(); 849 p_first = (LINENUM) atol(s); 850 while (isdigit(*s)) 851 s++; 852 if (*s == ',') { 853 p_ptrn_lines = (LINENUM) atol(++s); 854 while (isdigit(*s)) 855 s++; 856 } else 857 p_ptrn_lines = 1; 858 if (*s == ' ') 859 s++; 860 if (*s != '+' || !*++s) 861 malformed(); 862 p_newfirst = (LINENUM) atol(s); 863 while (isdigit(*s)) 864 s++; 865 if (*s == ',') { 866 p_repl_lines = (LINENUM) atol(++s); 867 while (isdigit(*s)) 868 s++; 869 } else 870 p_repl_lines = 1; 871 if (*s == ' ') 872 s++; 873 if (*s != '@') 874 malformed(); 875 if (!p_ptrn_lines) 876 p_first++; /* do append rather than insert */ 877 p_max = p_ptrn_lines + p_repl_lines + 1; 878 while (p_max >= hunkmax) 879 grow_hunkmax(); 880 fillsrc = 1; 881 filldst = fillsrc + p_ptrn_lines; 882 p_end = filldst + p_repl_lines; 883 snprintf(buf, sizeof buf, "*** %ld,%ld ****\n", p_first, 884 p_first + p_ptrn_lines - 1); 885 p_line[0] = savestr(buf); 886 if (out_of_mem) { 887 p_end = -1; 888 return false; 889 } 890 p_char[0] = '*'; 891 snprintf(buf, sizeof buf, "--- %ld,%ld ----\n", p_newfirst, 892 p_newfirst + p_repl_lines - 1); 893 p_line[filldst] = savestr(buf); 894 if (out_of_mem) { 895 p_end = 0; 896 return false; 897 } 898 p_char[filldst++] = '='; 899 p_context = 100; 900 context = 0; 901 p_hunk_beg = p_input_line + 1; 902 while (fillsrc <= p_ptrn_lines || filldst <= p_end) { 903 line_beginning = ftell(pfp); 904 ret = pgets(buf, sizeof buf, pfp); 905 p_input_line++; 906 if (ret == NULL) { 907 if (p_max - filldst < 3) { 908 /* assume blank lines got chopped */ 909 strlcpy(buf, " \n", sizeof buf); 910 } else { 911 fatal("unexpected end of file in patch\n"); 912 } 913 } 914 if (*buf == '\t' || *buf == '\n') { 915 ch = ' '; /* assume the space got eaten */ 916 s = savestr(buf); 917 } else { 918 ch = *buf; 919 s = savestr(buf + 1); 920 } 921 if (out_of_mem) { 922 while (--filldst > p_ptrn_lines) 923 free(p_line[filldst]); 924 p_end = fillsrc - 1; 925 return false; 926 } 927 switch (ch) { 928 case '-': 929 if (fillsrc > p_ptrn_lines) { 930 free(s); 931 p_end = filldst - 1; 932 malformed(); 933 } 934 p_char[fillsrc] = ch; 935 p_line[fillsrc] = s; 936 p_len[fillsrc++] = strlen(s); 937 if (fillsrc > p_ptrn_lines) { 938 if (remove_special_line()) { 939 p_len[fillsrc - 1] -= 1; 940 s[p_len[fillsrc - 1]] = 0; 941 } 942 } 943 break; 944 case '=': 945 ch = ' '; 946 /* FALL THROUGH */ 947 case ' ': 948 if (fillsrc > p_ptrn_lines) { 949 free(s); 950 while (--filldst > p_ptrn_lines) 951 free(p_line[filldst]); 952 p_end = fillsrc - 1; 953 malformed(); 954 } 955 context++; 956 p_char[fillsrc] = ch; 957 p_line[fillsrc] = s; 958 p_len[fillsrc++] = strlen(s); 959 s = savestr(s); 960 if (out_of_mem) { 961 while (--filldst > p_ptrn_lines) 962 free(p_line[filldst]); 963 p_end = fillsrc - 1; 964 return false; 965 } 966 if (fillsrc > p_ptrn_lines) { 967 if (remove_special_line()) { 968 p_len[fillsrc - 1] -= 1; 969 s[p_len[fillsrc - 1]] = 0; 970 } 971 } 972 /* FALL THROUGH */ 973 case '+': 974 if (filldst > p_end) { 975 free(s); 976 while (--filldst > p_ptrn_lines) 977 free(p_line[filldst]); 978 p_end = fillsrc - 1; 979 malformed(); 980 } 981 p_char[filldst] = ch; 982 p_line[filldst] = s; 983 p_len[filldst++] = strlen(s); 984 if (fillsrc > p_ptrn_lines) { 985 if (remove_special_line()) { 986 p_len[filldst - 1] -= 1; 987 s[p_len[filldst - 1]] = 0; 988 } 989 } 990 break; 991 default: 992 p_end = filldst; 993 malformed(); 994 } 995 if (ch != ' ' && context > 0) { 996 if (context < p_context) 997 p_context = context; 998 context = -1000; 999 } 1000 } /* while */ 1001 } else { /* normal diff--fake it up */ 1002 char hunk_type; 1003 int i; 1004 LINENUM min, max; 1005 long line_beginning = ftell(pfp); 1006 1007 p_context = 0; 1008 ret = pgets(buf, sizeof buf, pfp); 1009 p_input_line++; 1010 if (ret == NULL || !isdigit(*buf)) { 1011 next_intuit_at(line_beginning, p_input_line); 1012 return false; 1013 } 1014 p_first = (LINENUM) atol(buf); 1015 for (s = buf; isdigit(*s); s++) 1016 ; 1017 if (*s == ',') { 1018 p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1; 1019 while (isdigit(*s)) 1020 s++; 1021 } else 1022 p_ptrn_lines = (*s != 'a'); 1023 hunk_type = *s; 1024 if (hunk_type == 'a') 1025 p_first++; /* do append rather than insert */ 1026 min = (LINENUM) atol(++s); 1027 for (; isdigit(*s); s++) 1028 ; 1029 if (*s == ',') 1030 max = (LINENUM) atol(++s); 1031 else 1032 max = min; 1033 if (hunk_type == 'd') 1034 min++; 1035 p_end = p_ptrn_lines + 1 + max - min + 1; 1036 if (p_end > MAXHUNKSIZE) 1037 fatal("hunk too large (%ld lines) at line %ld: %s", 1038 p_end, p_input_line, buf); 1039 while (p_end >= hunkmax) 1040 grow_hunkmax(); 1041 p_newfirst = min; 1042 p_repl_lines = max - min + 1; 1043 snprintf(buf, sizeof buf, "*** %ld,%ld\n", p_first, 1044 p_first + p_ptrn_lines - 1); 1045 p_line[0] = savestr(buf); 1046 if (out_of_mem) { 1047 p_end = -1; 1048 return false; 1049 } 1050 p_char[0] = '*'; 1051 for (i = 1; i <= p_ptrn_lines; i++) { 1052 ret = pgets(buf, sizeof buf, pfp); 1053 p_input_line++; 1054 if (ret == NULL) 1055 fatal("unexpected end of file in patch at line %ld\n", 1056 p_input_line); 1057 if (*buf != '<') 1058 fatal("< expected at line %ld of patch\n", 1059 p_input_line); 1060 p_line[i] = savestr(buf + 2); 1061 if (out_of_mem) { 1062 p_end = i - 1; 1063 return false; 1064 } 1065 p_len[i] = strlen(p_line[i]); 1066 p_char[i] = '-'; 1067 } 1068 1069 if (remove_special_line()) { 1070 p_len[i - 1] -= 1; 1071 (p_line[i - 1])[p_len[i - 1]] = 0; 1072 } 1073 if (hunk_type == 'c') { 1074 ret = pgets(buf, sizeof buf, pfp); 1075 p_input_line++; 1076 if (ret == NULL) 1077 fatal("unexpected end of file in patch at line %ld\n", 1078 p_input_line); 1079 if (*buf != '-') 1080 fatal("--- expected at line %ld of patch\n", 1081 p_input_line); 1082 } 1083 snprintf(buf, sizeof(buf), "--- %ld,%ld\n", min, max); 1084 p_line[i] = savestr(buf); 1085 if (out_of_mem) { 1086 p_end = i - 1; 1087 return false; 1088 } 1089 p_char[i] = '='; 1090 for (i++; i <= p_end; i++) { 1091 ret = pgets(buf, sizeof buf, pfp); 1092 p_input_line++; 1093 if (ret == NULL) 1094 fatal("unexpected end of file in patch at line %ld\n", 1095 p_input_line); 1096 if (*buf != '>') 1097 fatal("> expected at line %ld of patch\n", 1098 p_input_line); 1099 p_line[i] = savestr(buf + 2); 1100 if (out_of_mem) { 1101 p_end = i - 1; 1102 return false; 1103 } 1104 p_len[i] = strlen(p_line[i]); 1105 p_char[i] = '+'; 1106 } 1107 1108 if (remove_special_line()) { 1109 p_len[i - 1] -= 1; 1110 (p_line[i - 1])[p_len[i - 1]] = 0; 1111 } 1112 } 1113 if (reverse) /* backwards patch? */ 1114 if (!pch_swap()) 1115 say("Not enough memory to swap next hunk!\n"); 1116 #ifdef DEBUGGING 1117 if (debug & 2) { 1118 int i; 1119 char special; 1120 1121 for (i = 0; i <= p_end; i++) { 1122 if (i == p_ptrn_lines) 1123 special = '^'; 1124 else 1125 special = ' '; 1126 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1127 special, p_line[i]); 1128 fflush(stderr); 1129 } 1130 } 1131 #endif 1132 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1133 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1134 return true; 1135 } 1136 1137 /* 1138 * Input a line from the patch file, worrying about indentation. 1139 */ 1140 static char * 1141 pgets(char *bf, int sz, FILE *fp) 1142 { 1143 char *s, *ret = fgets(bf, sz, fp); 1144 int indent = 0; 1145 1146 if (p_indent && ret != NULL) { 1147 for (s = buf; 1148 indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X'); 1149 s++) { 1150 if (*s == '\t') 1151 indent += 8 - (indent % 7); 1152 else 1153 indent++; 1154 } 1155 if (buf != s && strlcpy(buf, s, sizeof(buf)) >= sizeof(buf)) 1156 fatal("buffer too small in pgets()\n"); 1157 } 1158 return ret; 1159 } 1160 1161 /* 1162 * Reverse the old and new portions of the current hunk. 1163 */ 1164 bool 1165 pch_swap(void) 1166 { 1167 char **tp_line; /* the text of the hunk */ 1168 short *tp_len; /* length of each line */ 1169 char *tp_char; /* +, -, and ! */ 1170 LINENUM i; 1171 LINENUM n; 1172 bool blankline = false; 1173 char *s; 1174 1175 i = p_first; 1176 p_first = p_newfirst; 1177 p_newfirst = i; 1178 1179 /* make a scratch copy */ 1180 1181 tp_line = p_line; 1182 tp_len = p_len; 1183 tp_char = p_char; 1184 p_line = NULL; /* force set_hunkmax to allocate again */ 1185 p_len = NULL; 1186 p_char = NULL; 1187 set_hunkmax(); 1188 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1189 1190 free(p_line); 1191 p_line = tp_line; 1192 free(p_len); 1193 p_len = tp_len; 1194 free(p_char); 1195 p_char = tp_char; 1196 return false; /* not enough memory to swap hunk! */ 1197 } 1198 /* now turn the new into the old */ 1199 1200 i = p_ptrn_lines + 1; 1201 if (tp_char[i] == '\n') { /* account for possible blank line */ 1202 blankline = true; 1203 i++; 1204 } 1205 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1206 if (p_efake <= i) 1207 n = p_end - i + 1; 1208 else 1209 n = -i; 1210 p_efake += n; 1211 p_bfake += n; 1212 } 1213 for (n = 0; i <= p_end; i++, n++) { 1214 p_line[n] = tp_line[i]; 1215 p_char[n] = tp_char[i]; 1216 if (p_char[n] == '+') 1217 p_char[n] = '-'; 1218 p_len[n] = tp_len[i]; 1219 } 1220 if (blankline) { 1221 i = p_ptrn_lines + 1; 1222 p_line[n] = tp_line[i]; 1223 p_char[n] = tp_char[i]; 1224 p_len[n] = tp_len[i]; 1225 n++; 1226 } 1227 if (p_char[0] != '=') 1228 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1229 p_input_line, p_char[0]); 1230 p_char[0] = '*'; 1231 for (s = p_line[0]; *s; s++) 1232 if (*s == '-') 1233 *s = '*'; 1234 1235 /* now turn the old into the new */ 1236 1237 if (p_char[0] != '*') 1238 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1239 p_input_line, p_char[0]); 1240 tp_char[0] = '='; 1241 for (s = tp_line[0]; *s; s++) 1242 if (*s == '*') 1243 *s = '-'; 1244 for (i = 0; n <= p_end; i++, n++) { 1245 p_line[n] = tp_line[i]; 1246 p_char[n] = tp_char[i]; 1247 if (p_char[n] == '-') 1248 p_char[n] = '+'; 1249 p_len[n] = tp_len[i]; 1250 } 1251 1252 if (i != p_ptrn_lines + 1) 1253 fatal("Malformed patch at line %ld: expected %ld lines, " 1254 "got %ld\n", 1255 p_input_line, p_ptrn_lines + 1, i); 1256 1257 i = p_ptrn_lines; 1258 p_ptrn_lines = p_repl_lines; 1259 p_repl_lines = i; 1260 1261 free(tp_line); 1262 free(tp_len); 1263 free(tp_char); 1264 1265 return true; 1266 } 1267 1268 /* 1269 * Return the specified line position in the old file of the old context. 1270 */ 1271 LINENUM 1272 pch_first(void) 1273 { 1274 return p_first; 1275 } 1276 1277 /* 1278 * Return the number of lines of old context. 1279 */ 1280 LINENUM 1281 pch_ptrn_lines(void) 1282 { 1283 return p_ptrn_lines; 1284 } 1285 1286 /* 1287 * Return the probable line position in the new file of the first line. 1288 */ 1289 LINENUM 1290 pch_newfirst(void) 1291 { 1292 return p_newfirst; 1293 } 1294 1295 /* 1296 * Return the number of lines in the replacement text including context. 1297 */ 1298 LINENUM 1299 pch_repl_lines(void) 1300 { 1301 return p_repl_lines; 1302 } 1303 1304 /* 1305 * Return the number of lines in the whole hunk. 1306 */ 1307 LINENUM 1308 pch_end(void) 1309 { 1310 return p_end; 1311 } 1312 1313 /* 1314 * Return the number of context lines before the first changed line. 1315 */ 1316 LINENUM 1317 pch_context(void) 1318 { 1319 return p_context; 1320 } 1321 1322 /* 1323 * Return the length of a particular patch line. 1324 */ 1325 short 1326 pch_line_len(LINENUM line) 1327 { 1328 return p_len[line]; 1329 } 1330 1331 /* 1332 * Return the control character (+, -, *, !, etc) for a patch line. 1333 */ 1334 char 1335 pch_char(LINENUM line) 1336 { 1337 return p_char[line]; 1338 } 1339 1340 /* 1341 * Return a pointer to a particular patch line. 1342 */ 1343 char * 1344 pfetch(LINENUM line) 1345 { 1346 return p_line[line]; 1347 } 1348 1349 /* 1350 * Return where in the patch file this hunk began, for error messages. 1351 */ 1352 LINENUM 1353 pch_hunk_beg(void) 1354 { 1355 return p_hunk_beg; 1356 } 1357 1358 /* 1359 * Apply an ed script by feeding ed itself. 1360 */ 1361 void 1362 do_ed_script(void) 1363 { 1364 char *t; 1365 long beginning_of_this_line; 1366 FILE *pipefp = NULL; 1367 1368 if (!skip_rest_of_patch) { 1369 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1370 unlink(TMPOUTNAME); 1371 fatal("can't create temp file %s", TMPOUTNAME); 1372 } 1373 snprintf(buf, sizeof buf, "%s%s%s", _PATH_ED, 1374 verbose ? " " : " -s ", TMPOUTNAME); 1375 pipefp = popen(buf, "w"); 1376 } 1377 for (;;) { 1378 beginning_of_this_line = ftell(pfp); 1379 if (pgets(buf, sizeof buf, pfp) == NULL) { 1380 next_intuit_at(beginning_of_this_line, p_input_line); 1381 break; 1382 } 1383 p_input_line++; 1384 for (t = buf; isdigit(*t) || *t == ','; t++) 1385 ; 1386 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1387 if (isdigit(*buf) && (*t == 'a' || *t == 'c' || *t == 'd' || 1388 *t == 'i' || *t == 's')) { 1389 if (pipefp != NULL) 1390 fputs(buf, pipefp); 1391 if (*t != 'd') { 1392 while (pgets(buf, sizeof buf, pfp) != NULL) { 1393 p_input_line++; 1394 if (pipefp != NULL) 1395 fputs(buf, pipefp); 1396 if (strEQ(buf, ".\n")) 1397 break; 1398 } 1399 } 1400 } else { 1401 next_intuit_at(beginning_of_this_line, p_input_line); 1402 break; 1403 } 1404 } 1405 if (pipefp == NULL) 1406 return; 1407 fprintf(pipefp, "w\n"); 1408 fprintf(pipefp, "q\n"); 1409 fflush(pipefp); 1410 pclose(pipefp); 1411 ignore_signals(); 1412 if (!check_only) { 1413 if (move_file(TMPOUTNAME, outname) < 0) { 1414 toutkeep = true; 1415 chmod(TMPOUTNAME, filemode); 1416 } else 1417 chmod(outname, filemode); 1418 } 1419 set_signals(1); 1420 } 1421 1422 /* 1423 * Choose the name of the file to be patched based on POSIX rules. 1424 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1425 * if the user specified --posix or set POSIXLY_CORRECT. 1426 */ 1427 static char * 1428 posix_name(const struct file_name *names, bool assume_exists) 1429 { 1430 char *path = NULL; 1431 int i; 1432 1433 /* 1434 * POSIX states that the filename will be chosen from one 1435 * of the old, new and index names (in that order) if 1436 * the file exists relative to CWD after -p stripping. 1437 */ 1438 for (i = 0; i < MAX_FILE; i++) { 1439 if (names[i].path != NULL && names[i].exists) { 1440 path = names[i].path; 1441 break; 1442 } 1443 } 1444 if (path == NULL && !assume_exists) { 1445 /* 1446 * No files found, look for something we can checkout from 1447 * RCS/SCCS dirs. Same order as above. 1448 */ 1449 for (i = 0; i < MAX_FILE; i++) { 1450 if (names[i].path != NULL && 1451 (path = checked_in(names[i].path)) != NULL) 1452 break; 1453 } 1454 /* 1455 * Still no match? Check to see if the diff could be creating 1456 * a new file. 1457 */ 1458 if (path == NULL && ok_to_create_file && 1459 names[NEW_FILE].path != NULL) 1460 path = names[NEW_FILE].path; 1461 } 1462 1463 return path ? savestr(path) : NULL; 1464 } 1465 1466 /* 1467 * Choose the name of the file to be patched based the "best" one 1468 * available. 1469 */ 1470 static char * 1471 best_name(const struct file_name *names, bool assume_exists) 1472 { 1473 size_t min_components, min_baselen, min_len, tmp; 1474 char *best = NULL; 1475 int i; 1476 1477 /* 1478 * The "best" name is the one with the fewest number of path 1479 * components, the shortest basename length, and the shortest 1480 * overall length (in that order). We only use the Index: file 1481 * if neither of the old or new files could be intuited from 1482 * the diff header. 1483 */ 1484 min_components = min_baselen = min_len = SIZE_MAX; 1485 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1486 if (names[i].path == NULL || 1487 (!names[i].exists && !assume_exists)) 1488 continue; 1489 if ((tmp = num_components(names[i].path)) > min_components) 1490 continue; 1491 min_components = tmp; 1492 if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1493 continue; 1494 min_baselen = tmp; 1495 if ((tmp = strlen(names[i].path)) > min_len) 1496 continue; 1497 min_len = tmp; 1498 best = names[i].path; 1499 } 1500 if (best == NULL) { 1501 /* 1502 * No files found, look for something we can checkout from 1503 * RCS/SCCS dirs. Logic is identical to that above... 1504 */ 1505 min_components = min_baselen = min_len = SIZE_MAX; 1506 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1507 if (names[i].path == NULL || 1508 checked_in(names[i].path) == NULL) 1509 continue; 1510 if ((tmp = num_components(names[i].path)) > min_components) 1511 continue; 1512 min_components = tmp; 1513 if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1514 continue; 1515 min_baselen = tmp; 1516 if ((tmp = strlen(names[i].path)) > min_len) 1517 continue; 1518 min_len = tmp; 1519 best = names[i].path; 1520 } 1521 /* 1522 * Still no match? Check to see if the diff could be creating 1523 * a new file. 1524 */ 1525 if (best == NULL && ok_to_create_file && 1526 names[NEW_FILE].path != NULL) 1527 best = names[NEW_FILE].path; 1528 } 1529 1530 return best ? savestr(best) : NULL; 1531 } 1532 1533 static size_t 1534 num_components(const char *path) 1535 { 1536 size_t n; 1537 const char *cp; 1538 1539 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1540 while (*cp == '/') 1541 cp++; /* skip consecutive slashes */ 1542 } 1543 return n; 1544 } 1545