1 /* $OpenBSD: pch.c,v 1.37 2007/09/02 15:19:33 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 #ifndef lint 30 static const char rcsid[] = "$OpenBSD: pch.c,v 1.37 2007/09/02 15:19:33 deraadt Exp $"; 31 #endif /* not lint */ 32 33 #include <sys/types.h> 34 #include <sys/stat.h> 35 36 #include <ctype.h> 37 #include <libgen.h> 38 #include <limits.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include "common.h" 45 #include "util.h" 46 #include "pch.h" 47 #include "pathnames.h" 48 49 /* Patch (diff listing) abstract type. */ 50 51 static long p_filesize; /* size of the patch file */ 52 static LINENUM p_first; /* 1st line number */ 53 static LINENUM p_newfirst; /* 1st line number of replacement */ 54 static LINENUM p_ptrn_lines; /* # lines in pattern */ 55 static LINENUM p_repl_lines; /* # lines in replacement text */ 56 static LINENUM p_end = -1; /* last line in hunk */ 57 static LINENUM p_max; /* max allowed value of p_end */ 58 static LINENUM p_context = 3; /* # of context lines */ 59 static LINENUM p_input_line = 0; /* current line # from patch file */ 60 static char **p_line = NULL;/* the text of the hunk */ 61 static short *p_len = NULL; /* length of each line */ 62 static char *p_char = NULL; /* +, -, and ! */ 63 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 64 static int p_indent; /* indent to patch */ 65 static LINENUM p_base; /* where to intuit this time */ 66 static LINENUM p_bline; /* line # of p_base */ 67 static LINENUM p_start; /* where intuit found a patch */ 68 static LINENUM p_sline; /* and the line number for it */ 69 static LINENUM p_hunk_beg; /* line number of current hunk */ 70 static LINENUM p_efake = -1; /* end of faked up lines--don't free */ 71 static LINENUM p_bfake = -1; /* beg of faked up lines */ 72 static FILE *pfp = NULL; /* patch file pointer */ 73 static char *bestguess = NULL; /* guess at correct filename */ 74 75 static void grow_hunkmax(void); 76 static int intuit_diff_type(void); 77 static void next_intuit_at(LINENUM, LINENUM); 78 static void skip_to(LINENUM, LINENUM); 79 static char *pgets(char *, int, FILE *); 80 static char *best_name(const struct file_name *, bool); 81 static char *posix_name(const struct file_name *, bool); 82 static size_t num_components(const char *); 83 84 /* 85 * Prepare to look for the next patch in the patch file. 86 */ 87 void 88 re_patch(void) 89 { 90 p_first = 0; 91 p_newfirst = 0; 92 p_ptrn_lines = 0; 93 p_repl_lines = 0; 94 p_end = (LINENUM) - 1; 95 p_max = 0; 96 p_indent = 0; 97 } 98 99 /* 100 * Open the patch file at the beginning of time. 101 */ 102 void 103 open_patch_file(const char *filename) 104 { 105 struct stat filestat; 106 107 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 108 pfp = fopen(TMPPATNAME, "w"); 109 if (pfp == NULL) 110 pfatal("can't create %s", TMPPATNAME); 111 while (fgets(buf, sizeof buf, stdin) != NULL) 112 fputs(buf, pfp); 113 fclose(pfp); 114 filename = TMPPATNAME; 115 } 116 pfp = fopen(filename, "r"); 117 if (pfp == NULL) 118 pfatal("patch file %s not found", filename); 119 fstat(fileno(pfp), &filestat); 120 p_filesize = filestat.st_size; 121 next_intuit_at(0L, 1L); /* start at the beginning */ 122 set_hunkmax(); 123 } 124 125 /* 126 * Make sure our dynamically realloced tables are malloced to begin with. 127 */ 128 void 129 set_hunkmax(void) 130 { 131 if (p_line == NULL) 132 p_line = calloc((size_t) hunkmax, sizeof(char *)); 133 if (p_len == NULL) 134 p_len = calloc((size_t) hunkmax, sizeof(short)); 135 if (p_char == NULL) 136 p_char = calloc((size_t) hunkmax, sizeof(char)); 137 } 138 139 /* 140 * Enlarge the arrays containing the current hunk of patch. 141 */ 142 static void 143 grow_hunkmax(void) 144 { 145 int new_hunkmax; 146 char **new_p_line; 147 short *new_p_len; 148 char *new_p_char; 149 150 new_hunkmax = hunkmax * 2; 151 152 if (p_line == NULL || p_len == NULL || p_char == NULL) 153 fatal("Internal memory allocation error\n"); 154 155 new_p_line = realloc(p_line, new_hunkmax * sizeof(char *)); 156 if (new_p_line == NULL) 157 free(p_line); 158 159 new_p_len = realloc(p_len, new_hunkmax * sizeof(short)); 160 if (new_p_len == NULL) 161 free(p_len); 162 163 new_p_char = realloc(p_char, new_hunkmax * sizeof(char)); 164 if (new_p_char == NULL) 165 free(p_char); 166 167 p_char = new_p_char; 168 p_len = new_p_len; 169 p_line = new_p_line; 170 171 if (p_line != NULL && p_len != NULL && p_char != NULL) { 172 hunkmax = new_hunkmax; 173 return; 174 } 175 176 if (!using_plan_a) 177 fatal("out of memory\n"); 178 out_of_mem = true; /* whatever is null will be allocated again */ 179 /* from within plan_a(), of all places */ 180 } 181 182 /* True if the remainder of the patch file contains a diff of some sort. */ 183 184 bool 185 there_is_another_patch(void) 186 { 187 bool exists = false; 188 189 if (p_base != 0L && p_base >= p_filesize) { 190 if (verbose) 191 say("done\n"); 192 return false; 193 } 194 if (verbose) 195 say("Hmm..."); 196 diff_type = intuit_diff_type(); 197 if (!diff_type) { 198 if (p_base != 0L) { 199 if (verbose) 200 say(" Ignoring the trailing garbage.\ndone\n"); 201 } else 202 say(" I can't seem to find a patch in there anywhere.\n"); 203 return false; 204 } 205 if (verbose) 206 say(" %sooks like %s to me...\n", 207 (p_base == 0L ? "L" : "The next patch l"), 208 diff_type == UNI_DIFF ? "a unified diff" : 209 diff_type == CONTEXT_DIFF ? "a context diff" : 210 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 211 diff_type == NORMAL_DIFF ? "a normal diff" : 212 "an ed script"); 213 if (p_indent && verbose) 214 say("(Patch is indented %d space%s.)\n", p_indent, 215 p_indent == 1 ? "" : "s"); 216 skip_to(p_start, p_sline); 217 while (filearg[0] == NULL) { 218 if (force || batch) { 219 say("No file to patch. Skipping...\n"); 220 filearg[0] = savestr(bestguess); 221 skip_rest_of_patch = true; 222 return true; 223 } 224 ask("File to patch: "); 225 if (*buf != '\n') { 226 free(bestguess); 227 bestguess = savestr(buf); 228 filearg[0] = fetchname(buf, &exists, 0); 229 } 230 if (!exists) { 231 ask("No file found--skip this patch? [n] "); 232 if (*buf != 'y') 233 continue; 234 if (verbose) 235 say("Skipping patch...\n"); 236 free(filearg[0]); 237 filearg[0] = fetchname(bestguess, &exists, 0); 238 skip_rest_of_patch = true; 239 return true; 240 } 241 } 242 return true; 243 } 244 245 /* Determine what kind of diff is in the remaining part of the patch file. */ 246 247 static int 248 intuit_diff_type(void) 249 { 250 long this_line = 0, previous_line; 251 long first_command_line = -1; 252 LINENUM fcl_line = -1; 253 bool last_line_was_command = false, this_is_a_command = false; 254 bool stars_last_line = false, stars_this_line = false; 255 char *s, *t; 256 int indent, retval; 257 struct file_name names[MAX_FILE]; 258 259 memset(names, 0, sizeof(names)); 260 ok_to_create_file = false; 261 fseek(pfp, p_base, SEEK_SET); 262 p_input_line = p_bline - 1; 263 for (;;) { 264 previous_line = this_line; 265 last_line_was_command = this_is_a_command; 266 stars_last_line = stars_this_line; 267 this_line = ftell(pfp); 268 indent = 0; 269 p_input_line++; 270 if (fgets(buf, sizeof buf, pfp) == NULL) { 271 if (first_command_line >= 0L) { 272 /* nothing but deletes!? */ 273 p_start = first_command_line; 274 p_sline = fcl_line; 275 retval = ED_DIFF; 276 goto scan_exit; 277 } else { 278 p_start = this_line; 279 p_sline = p_input_line; 280 retval = 0; 281 goto scan_exit; 282 } 283 } 284 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 285 if (*s == '\t') 286 indent += 8 - (indent % 8); 287 else 288 indent++; 289 } 290 for (t = s; isdigit(*t) || *t == ','; t++) 291 ; 292 this_is_a_command = (isdigit(*s) && 293 (*t == 'd' || *t == 'c' || *t == 'a')); 294 if (first_command_line < 0L && this_is_a_command) { 295 first_command_line = this_line; 296 fcl_line = p_input_line; 297 p_indent = indent; /* assume this for now */ 298 } 299 if (!stars_last_line && strnEQ(s, "*** ", 4)) 300 names[OLD_FILE].path = fetchname(s + 4, 301 &names[OLD_FILE].exists, strippath); 302 else if (strnEQ(s, "--- ", 4)) 303 names[NEW_FILE].path = fetchname(s + 4, 304 &names[NEW_FILE].exists, strippath); 305 else if (strnEQ(s, "+++ ", 4)) 306 /* pretend it is the old name */ 307 names[OLD_FILE].path = fetchname(s + 4, 308 &names[OLD_FILE].exists, strippath); 309 else if (strnEQ(s, "Index:", 6)) 310 names[INDEX_FILE].path = fetchname(s + 6, 311 &names[INDEX_FILE].exists, strippath); 312 else if (strnEQ(s, "Prereq:", 7)) { 313 for (t = s + 7; isspace(*t); t++) 314 ; 315 revision = savestr(t); 316 for (t = revision; *t && !isspace(*t); t++) 317 ; 318 *t = '\0'; 319 if (*revision == '\0') { 320 free(revision); 321 revision = NULL; 322 } 323 } 324 if ((!diff_type || diff_type == ED_DIFF) && 325 first_command_line >= 0L && 326 strEQ(s, ".\n")) { 327 p_indent = indent; 328 p_start = first_command_line; 329 p_sline = fcl_line; 330 retval = ED_DIFF; 331 goto scan_exit; 332 } 333 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 334 if (strnEQ(s + 4, "0,0", 3)) 335 ok_to_create_file = true; 336 p_indent = indent; 337 p_start = this_line; 338 p_sline = p_input_line; 339 retval = UNI_DIFF; 340 goto scan_exit; 341 } 342 stars_this_line = strnEQ(s, "********", 8); 343 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 344 strnEQ(s, "*** ", 4)) { 345 if (atol(s + 4) == 0) 346 ok_to_create_file = true; 347 /* 348 * If this is a new context diff the character just 349 * before the newline is a '*'. 350 */ 351 while (*s != '\n') 352 s++; 353 p_indent = indent; 354 p_start = previous_line; 355 p_sline = p_input_line - 1; 356 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 357 goto scan_exit; 358 } 359 if ((!diff_type || diff_type == NORMAL_DIFF) && 360 last_line_was_command && 361 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 362 p_start = previous_line; 363 p_sline = p_input_line - 1; 364 p_indent = indent; 365 retval = NORMAL_DIFF; 366 goto scan_exit; 367 } 368 } 369 scan_exit: 370 if (retval == UNI_DIFF) { 371 /* unswap old and new */ 372 struct file_name tmp = names[OLD_FILE]; 373 names[OLD_FILE] = names[NEW_FILE]; 374 names[NEW_FILE] = tmp; 375 } 376 if (filearg[0] == NULL) { 377 if (posix) 378 filearg[0] = posix_name(names, ok_to_create_file); 379 else { 380 /* Ignore the Index: name for context diffs, like GNU */ 381 if (names[OLD_FILE].path != NULL || 382 names[NEW_FILE].path != NULL) { 383 free(names[INDEX_FILE].path); 384 names[INDEX_FILE].path = NULL; 385 } 386 filearg[0] = best_name(names, ok_to_create_file); 387 } 388 } 389 390 free(bestguess); 391 bestguess = NULL; 392 if (filearg[0] != NULL) 393 bestguess = savestr(filearg[0]); 394 else if (!ok_to_create_file) { 395 /* 396 * We don't want to create a new file but we need a 397 * filename to set bestguess. Avoid setting filearg[0] 398 * so the file is not created automatically. 399 */ 400 if (posix) 401 bestguess = posix_name(names, true); 402 else 403 bestguess = best_name(names, true); 404 } 405 free(names[OLD_FILE].path); 406 free(names[NEW_FILE].path); 407 free(names[INDEX_FILE].path); 408 return retval; 409 } 410 411 /* 412 * Remember where this patch ends so we know where to start up again. 413 */ 414 static void 415 next_intuit_at(LINENUM file_pos, LINENUM file_line) 416 { 417 p_base = file_pos; 418 p_bline = file_line; 419 } 420 421 /* 422 * Basically a verbose fseek() to the actual diff listing. 423 */ 424 static void 425 skip_to(LINENUM file_pos, LINENUM file_line) 426 { 427 char *ret; 428 429 if (p_base > file_pos) 430 fatal("Internal error: seek %ld>%ld\n", p_base, file_pos); 431 if (verbose && p_base < file_pos) { 432 fseek(pfp, p_base, SEEK_SET); 433 say("The text leading up to this was:\n--------------------------\n"); 434 while (ftell(pfp) < file_pos) { 435 ret = fgets(buf, sizeof buf, pfp); 436 if (ret == NULL) 437 fatal("Unexpected end of file\n"); 438 say("|%s", buf); 439 } 440 say("--------------------------\n"); 441 } else 442 fseek(pfp, file_pos, SEEK_SET); 443 p_input_line = file_line - 1; 444 } 445 446 /* Make this a function for better debugging. */ 447 static void 448 malformed(void) 449 { 450 fatal("malformed patch at line %ld: %s", p_input_line, buf); 451 /* about as informative as "Syntax error" in C */ 452 } 453 454 /* 455 * True if the line has been discarded (i.e. it is a line saying 456 * "\ No newline at end of file".) 457 */ 458 static bool 459 remove_special_line(void) 460 { 461 int c; 462 463 c = fgetc(pfp); 464 if (c == '\\') { 465 do { 466 c = fgetc(pfp); 467 } while (c != EOF && c != '\n'); 468 469 return true; 470 } 471 if (c != EOF) 472 fseek(pfp, -1L, SEEK_CUR); 473 474 return false; 475 } 476 477 /* 478 * True if there is more of the current diff listing to process. 479 */ 480 bool 481 another_hunk(void) 482 { 483 long line_beginning; /* file pos of the current line */ 484 LINENUM repl_beginning; /* index of --- line */ 485 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 486 LINENUM fillsrc; /* index of first line to copy */ 487 LINENUM filldst; /* index of first missing line */ 488 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 489 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 490 bool repl_missing; /* we are now backtracking */ 491 long repl_backtrack_position; /* file pos of first repl line */ 492 LINENUM repl_patch_line; /* input line number for same */ 493 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 494 char *s, *ret; 495 int context = 0; 496 497 while (p_end >= 0) { 498 if (p_end == p_efake) 499 p_end = p_bfake; /* don't free twice */ 500 else 501 free(p_line[p_end]); 502 p_end--; 503 } 504 p_efake = -1; 505 506 p_max = hunkmax; /* gets reduced when --- found */ 507 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 508 line_beginning = ftell(pfp); 509 repl_beginning = 0; 510 fillcnt = 0; 511 ptrn_spaces_eaten = false; 512 repl_could_be_missing = true; 513 repl_missing = false; 514 repl_backtrack_position = 0; 515 ptrn_copiable = 0; 516 517 ret = pgets(buf, sizeof buf, pfp); 518 p_input_line++; 519 if (ret == NULL || strnNE(buf, "********", 8)) { 520 next_intuit_at(line_beginning, p_input_line); 521 return false; 522 } 523 p_context = 100; 524 p_hunk_beg = p_input_line + 1; 525 while (p_end < p_max) { 526 line_beginning = ftell(pfp); 527 ret = pgets(buf, sizeof buf, pfp); 528 p_input_line++; 529 if (ret == NULL) { 530 if (p_max - p_end < 4) { 531 /* assume blank lines got chopped */ 532 strlcpy(buf, " \n", sizeof buf); 533 } else { 534 if (repl_beginning && repl_could_be_missing) { 535 repl_missing = true; 536 goto hunk_done; 537 } 538 fatal("unexpected end of file in patch\n"); 539 } 540 } 541 p_end++; 542 if (p_end >= hunkmax) 543 fatal("Internal error: hunk larger than hunk " 544 "buffer size"); 545 p_char[p_end] = *buf; 546 p_line[p_end] = NULL; 547 switch (*buf) { 548 case '*': 549 if (strnEQ(buf, "********", 8)) { 550 if (repl_beginning && repl_could_be_missing) { 551 repl_missing = true; 552 goto hunk_done; 553 } else 554 fatal("unexpected end of hunk " 555 "at line %ld\n", 556 p_input_line); 557 } 558 if (p_end != 0) { 559 if (repl_beginning && repl_could_be_missing) { 560 repl_missing = true; 561 goto hunk_done; 562 } 563 fatal("unexpected *** at line %ld: %s", 564 p_input_line, buf); 565 } 566 context = 0; 567 p_line[p_end] = savestr(buf); 568 if (out_of_mem) { 569 p_end--; 570 return false; 571 } 572 for (s = buf; *s && !isdigit(*s); s++) 573 ; 574 if (!*s) 575 malformed(); 576 if (strnEQ(s, "0,0", 3)) 577 memmove(s, s + 2, strlen(s + 2) + 1); 578 p_first = (LINENUM) atol(s); 579 while (isdigit(*s)) 580 s++; 581 if (*s == ',') { 582 for (; *s && !isdigit(*s); s++) 583 ; 584 if (!*s) 585 malformed(); 586 p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1; 587 } else if (p_first) 588 p_ptrn_lines = 1; 589 else { 590 p_ptrn_lines = 0; 591 p_first = 1; 592 } 593 594 /* we need this much at least */ 595 p_max = p_ptrn_lines + 6; 596 while (p_max >= hunkmax) 597 grow_hunkmax(); 598 p_max = hunkmax; 599 break; 600 case '-': 601 if (buf[1] == '-') { 602 if (repl_beginning || 603 (p_end != p_ptrn_lines + 1 + 604 (p_char[p_end - 1] == '\n'))) { 605 if (p_end == 1) { 606 /* 607 * `old' lines were omitted; 608 * set up to fill them in 609 * from 'new' context lines. 610 */ 611 p_end = p_ptrn_lines + 1; 612 fillsrc = p_end + 1; 613 filldst = 1; 614 fillcnt = p_ptrn_lines; 615 } else { 616 if (repl_beginning) { 617 if (repl_could_be_missing) { 618 repl_missing = true; 619 goto hunk_done; 620 } 621 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 622 p_input_line, p_hunk_beg + repl_beginning); 623 } else { 624 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 625 (p_end <= p_ptrn_lines 626 ? "Premature" 627 : "Overdue"), 628 p_input_line, p_hunk_beg); 629 } 630 } 631 } 632 repl_beginning = p_end; 633 repl_backtrack_position = ftell(pfp); 634 repl_patch_line = p_input_line; 635 p_line[p_end] = savestr(buf); 636 if (out_of_mem) { 637 p_end--; 638 return false; 639 } 640 p_char[p_end] = '='; 641 for (s = buf; *s && !isdigit(*s); s++) 642 ; 643 if (!*s) 644 malformed(); 645 p_newfirst = (LINENUM) atol(s); 646 while (isdigit(*s)) 647 s++; 648 if (*s == ',') { 649 for (; *s && !isdigit(*s); s++) 650 ; 651 if (!*s) 652 malformed(); 653 p_repl_lines = ((LINENUM) atol(s)) - 654 p_newfirst + 1; 655 } else if (p_newfirst) 656 p_repl_lines = 1; 657 else { 658 p_repl_lines = 0; 659 p_newfirst = 1; 660 } 661 p_max = p_repl_lines + p_end; 662 if (p_max > MAXHUNKSIZE) 663 fatal("hunk too large (%ld lines) at line %ld: %s", 664 p_max, p_input_line, buf); 665 while (p_max >= hunkmax) 666 grow_hunkmax(); 667 if (p_repl_lines != ptrn_copiable && 668 (p_context != 0 || p_repl_lines != 1)) 669 repl_could_be_missing = false; 670 break; 671 } 672 goto change_line; 673 case '+': 674 case '!': 675 repl_could_be_missing = false; 676 change_line: 677 if (buf[1] == '\n' && canonicalize) 678 strlcpy(buf + 1, " \n", sizeof buf - 1); 679 if (!isspace(buf[1]) && buf[1] != '>' && 680 buf[1] != '<' && 681 repl_beginning && repl_could_be_missing) { 682 repl_missing = true; 683 goto hunk_done; 684 } 685 if (context >= 0) { 686 if (context < p_context) 687 p_context = context; 688 context = -1000; 689 } 690 p_line[p_end] = savestr(buf + 2); 691 if (out_of_mem) { 692 p_end--; 693 return false; 694 } 695 if (p_end == p_ptrn_lines) { 696 if (remove_special_line()) { 697 int len; 698 699 len = strlen(p_line[p_end]) - 1; 700 (p_line[p_end])[len] = 0; 701 } 702 } 703 break; 704 case '\t': 705 case '\n': /* assume the 2 spaces got eaten */ 706 if (repl_beginning && repl_could_be_missing && 707 (!ptrn_spaces_eaten || 708 diff_type == NEW_CONTEXT_DIFF)) { 709 repl_missing = true; 710 goto hunk_done; 711 } 712 p_line[p_end] = savestr(buf); 713 if (out_of_mem) { 714 p_end--; 715 return false; 716 } 717 if (p_end != p_ptrn_lines + 1) { 718 ptrn_spaces_eaten |= (repl_beginning != 0); 719 context++; 720 if (!repl_beginning) 721 ptrn_copiable++; 722 p_char[p_end] = ' '; 723 } 724 break; 725 case ' ': 726 if (!isspace(buf[1]) && 727 repl_beginning && repl_could_be_missing) { 728 repl_missing = true; 729 goto hunk_done; 730 } 731 context++; 732 if (!repl_beginning) 733 ptrn_copiable++; 734 p_line[p_end] = savestr(buf + 2); 735 if (out_of_mem) { 736 p_end--; 737 return false; 738 } 739 break; 740 default: 741 if (repl_beginning && repl_could_be_missing) { 742 repl_missing = true; 743 goto hunk_done; 744 } 745 malformed(); 746 } 747 /* set up p_len for strncmp() so we don't have to */ 748 /* assume null termination */ 749 if (p_line[p_end]) 750 p_len[p_end] = strlen(p_line[p_end]); 751 else 752 p_len[p_end] = 0; 753 } 754 755 hunk_done: 756 if (p_end >= 0 && !repl_beginning) 757 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 758 759 if (repl_missing) { 760 761 /* reset state back to just after --- */ 762 p_input_line = repl_patch_line; 763 for (p_end--; p_end > repl_beginning; p_end--) 764 free(p_line[p_end]); 765 fseek(pfp, repl_backtrack_position, SEEK_SET); 766 767 /* redundant 'new' context lines were omitted - set */ 768 /* up to fill them in from the old file context */ 769 if (!p_context && p_repl_lines == 1) { 770 p_repl_lines = 0; 771 p_max--; 772 } 773 fillsrc = 1; 774 filldst = repl_beginning + 1; 775 fillcnt = p_repl_lines; 776 p_end = p_max; 777 } else if (!p_context && fillcnt == 1) { 778 /* the first hunk was a null hunk with no context */ 779 /* and we were expecting one line -- fix it up. */ 780 while (filldst < p_end) { 781 p_line[filldst] = p_line[filldst + 1]; 782 p_char[filldst] = p_char[filldst + 1]; 783 p_len[filldst] = p_len[filldst + 1]; 784 filldst++; 785 } 786 #if 0 787 repl_beginning--; /* this doesn't need to be fixed */ 788 #endif 789 p_end--; 790 p_first++; /* do append rather than insert */ 791 fillcnt = 0; 792 p_ptrn_lines = 0; 793 } 794 if (diff_type == CONTEXT_DIFF && 795 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 796 if (verbose) 797 say("%s\n%s\n%s\n", 798 "(Fascinating--this is really a new-style context diff but without", 799 "the telltale extra asterisks on the *** line that usually indicate", 800 "the new style...)"); 801 diff_type = NEW_CONTEXT_DIFF; 802 } 803 /* if there were omitted context lines, fill them in now */ 804 if (fillcnt) { 805 p_bfake = filldst; /* remember where not to free() */ 806 p_efake = filldst + fillcnt - 1; 807 while (fillcnt-- > 0) { 808 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 809 fillsrc++; 810 if (fillsrc > p_end) 811 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 812 p_hunk_beg); 813 p_line[filldst] = p_line[fillsrc]; 814 p_char[filldst] = p_char[fillsrc]; 815 p_len[filldst] = p_len[fillsrc]; 816 fillsrc++; 817 filldst++; 818 } 819 while (fillsrc <= p_end && fillsrc != repl_beginning && 820 p_char[fillsrc] != ' ') 821 fillsrc++; 822 #ifdef DEBUGGING 823 if (debug & 64) 824 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 825 fillsrc, filldst, repl_beginning, p_end + 1); 826 #endif 827 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 828 malformed(); 829 if (filldst != p_end + 1 && filldst != repl_beginning) 830 malformed(); 831 } 832 if (p_line[p_end] != NULL) { 833 if (remove_special_line()) { 834 p_len[p_end] -= 1; 835 (p_line[p_end])[p_len[p_end]] = 0; 836 } 837 } 838 } else if (diff_type == UNI_DIFF) { 839 long line_beginning = ftell(pfp); /* file pos of the current line */ 840 LINENUM fillsrc; /* index of old lines */ 841 LINENUM filldst; /* index of new lines */ 842 char ch; 843 844 ret = pgets(buf, sizeof buf, pfp); 845 p_input_line++; 846 if (ret == NULL || strnNE(buf, "@@ -", 4)) { 847 next_intuit_at(line_beginning, p_input_line); 848 return false; 849 } 850 s = buf + 4; 851 if (!*s) 852 malformed(); 853 p_first = (LINENUM) atol(s); 854 while (isdigit(*s)) 855 s++; 856 if (*s == ',') { 857 p_ptrn_lines = (LINENUM) atol(++s); 858 while (isdigit(*s)) 859 s++; 860 } else 861 p_ptrn_lines = 1; 862 if (*s == ' ') 863 s++; 864 if (*s != '+' || !*++s) 865 malformed(); 866 p_newfirst = (LINENUM) atol(s); 867 while (isdigit(*s)) 868 s++; 869 if (*s == ',') { 870 p_repl_lines = (LINENUM) atol(++s); 871 while (isdigit(*s)) 872 s++; 873 } else 874 p_repl_lines = 1; 875 if (*s == ' ') 876 s++; 877 if (*s != '@') 878 malformed(); 879 if (!p_ptrn_lines) 880 p_first++; /* do append rather than insert */ 881 p_max = p_ptrn_lines + p_repl_lines + 1; 882 while (p_max >= hunkmax) 883 grow_hunkmax(); 884 fillsrc = 1; 885 filldst = fillsrc + p_ptrn_lines; 886 p_end = filldst + p_repl_lines; 887 snprintf(buf, sizeof buf, "*** %ld,%ld ****\n", p_first, 888 p_first + p_ptrn_lines - 1); 889 p_line[0] = savestr(buf); 890 if (out_of_mem) { 891 p_end = -1; 892 return false; 893 } 894 p_char[0] = '*'; 895 snprintf(buf, sizeof buf, "--- %ld,%ld ----\n", p_newfirst, 896 p_newfirst + p_repl_lines - 1); 897 p_line[filldst] = savestr(buf); 898 if (out_of_mem) { 899 p_end = 0; 900 return false; 901 } 902 p_char[filldst++] = '='; 903 p_context = 100; 904 context = 0; 905 p_hunk_beg = p_input_line + 1; 906 while (fillsrc <= p_ptrn_lines || filldst <= p_end) { 907 line_beginning = ftell(pfp); 908 ret = pgets(buf, sizeof buf, pfp); 909 p_input_line++; 910 if (ret == NULL) { 911 if (p_max - filldst < 3) { 912 /* assume blank lines got chopped */ 913 strlcpy(buf, " \n", sizeof buf); 914 } else { 915 fatal("unexpected end of file in patch\n"); 916 } 917 } 918 if (*buf == '\t' || *buf == '\n') { 919 ch = ' '; /* assume the space got eaten */ 920 s = savestr(buf); 921 } else { 922 ch = *buf; 923 s = savestr(buf + 1); 924 } 925 if (out_of_mem) { 926 while (--filldst > p_ptrn_lines) 927 free(p_line[filldst]); 928 p_end = fillsrc - 1; 929 return false; 930 } 931 switch (ch) { 932 case '-': 933 if (fillsrc > p_ptrn_lines) { 934 free(s); 935 p_end = filldst - 1; 936 malformed(); 937 } 938 p_char[fillsrc] = ch; 939 p_line[fillsrc] = s; 940 p_len[fillsrc++] = strlen(s); 941 if (fillsrc > p_ptrn_lines) { 942 if (remove_special_line()) { 943 p_len[fillsrc - 1] -= 1; 944 s[p_len[fillsrc - 1]] = 0; 945 } 946 } 947 break; 948 case '=': 949 ch = ' '; 950 /* FALL THROUGH */ 951 case ' ': 952 if (fillsrc > p_ptrn_lines) { 953 free(s); 954 while (--filldst > p_ptrn_lines) 955 free(p_line[filldst]); 956 p_end = fillsrc - 1; 957 malformed(); 958 } 959 context++; 960 p_char[fillsrc] = ch; 961 p_line[fillsrc] = s; 962 p_len[fillsrc++] = strlen(s); 963 s = savestr(s); 964 if (out_of_mem) { 965 while (--filldst > p_ptrn_lines) 966 free(p_line[filldst]); 967 p_end = fillsrc - 1; 968 return false; 969 } 970 if (fillsrc > p_ptrn_lines) { 971 if (remove_special_line()) { 972 p_len[fillsrc - 1] -= 1; 973 s[p_len[fillsrc - 1]] = 0; 974 } 975 } 976 /* FALL THROUGH */ 977 case '+': 978 if (filldst > p_end) { 979 free(s); 980 while (--filldst > p_ptrn_lines) 981 free(p_line[filldst]); 982 p_end = fillsrc - 1; 983 malformed(); 984 } 985 p_char[filldst] = ch; 986 p_line[filldst] = s; 987 p_len[filldst++] = strlen(s); 988 if (fillsrc > p_ptrn_lines) { 989 if (remove_special_line()) { 990 p_len[filldst - 1] -= 1; 991 s[p_len[filldst - 1]] = 0; 992 } 993 } 994 break; 995 default: 996 p_end = filldst; 997 malformed(); 998 } 999 if (ch != ' ' && context > 0) { 1000 if (context < p_context) 1001 p_context = context; 1002 context = -1000; 1003 } 1004 } /* while */ 1005 } else { /* normal diff--fake it up */ 1006 char hunk_type; 1007 int i; 1008 LINENUM min, max; 1009 long line_beginning = ftell(pfp); 1010 1011 p_context = 0; 1012 ret = pgets(buf, sizeof buf, pfp); 1013 p_input_line++; 1014 if (ret == NULL || !isdigit(*buf)) { 1015 next_intuit_at(line_beginning, p_input_line); 1016 return false; 1017 } 1018 p_first = (LINENUM) atol(buf); 1019 for (s = buf; isdigit(*s); s++) 1020 ; 1021 if (*s == ',') { 1022 p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1; 1023 while (isdigit(*s)) 1024 s++; 1025 } else 1026 p_ptrn_lines = (*s != 'a'); 1027 hunk_type = *s; 1028 if (hunk_type == 'a') 1029 p_first++; /* do append rather than insert */ 1030 min = (LINENUM) atol(++s); 1031 for (; isdigit(*s); s++) 1032 ; 1033 if (*s == ',') 1034 max = (LINENUM) atol(++s); 1035 else 1036 max = min; 1037 if (hunk_type == 'd') 1038 min++; 1039 p_end = p_ptrn_lines + 1 + max - min + 1; 1040 if (p_end > MAXHUNKSIZE) 1041 fatal("hunk too large (%ld lines) at line %ld: %s", 1042 p_end, p_input_line, buf); 1043 while (p_end >= hunkmax) 1044 grow_hunkmax(); 1045 p_newfirst = min; 1046 p_repl_lines = max - min + 1; 1047 snprintf(buf, sizeof buf, "*** %ld,%ld\n", p_first, 1048 p_first + p_ptrn_lines - 1); 1049 p_line[0] = savestr(buf); 1050 if (out_of_mem) { 1051 p_end = -1; 1052 return false; 1053 } 1054 p_char[0] = '*'; 1055 for (i = 1; i <= p_ptrn_lines; i++) { 1056 ret = pgets(buf, sizeof buf, pfp); 1057 p_input_line++; 1058 if (ret == NULL) 1059 fatal("unexpected end of file in patch at line %ld\n", 1060 p_input_line); 1061 if (*buf != '<') 1062 fatal("< expected at line %ld of patch\n", 1063 p_input_line); 1064 p_line[i] = savestr(buf + 2); 1065 if (out_of_mem) { 1066 p_end = i - 1; 1067 return false; 1068 } 1069 p_len[i] = strlen(p_line[i]); 1070 p_char[i] = '-'; 1071 } 1072 1073 if (remove_special_line()) { 1074 p_len[i - 1] -= 1; 1075 (p_line[i - 1])[p_len[i - 1]] = 0; 1076 } 1077 if (hunk_type == 'c') { 1078 ret = pgets(buf, sizeof buf, pfp); 1079 p_input_line++; 1080 if (ret == NULL) 1081 fatal("unexpected end of file in patch at line %ld\n", 1082 p_input_line); 1083 if (*buf != '-') 1084 fatal("--- expected at line %ld of patch\n", 1085 p_input_line); 1086 } 1087 snprintf(buf, sizeof(buf), "--- %ld,%ld\n", min, max); 1088 p_line[i] = savestr(buf); 1089 if (out_of_mem) { 1090 p_end = i - 1; 1091 return false; 1092 } 1093 p_char[i] = '='; 1094 for (i++; i <= p_end; i++) { 1095 ret = pgets(buf, sizeof buf, pfp); 1096 p_input_line++; 1097 if (ret == NULL) 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 p_line[i] = savestr(buf + 2); 1104 if (out_of_mem) { 1105 p_end = i - 1; 1106 return false; 1107 } 1108 p_len[i] = strlen(p_line[i]); 1109 p_char[i] = '+'; 1110 } 1111 1112 if (remove_special_line()) { 1113 p_len[i - 1] -= 1; 1114 (p_line[i - 1])[p_len[i - 1]] = 0; 1115 } 1116 } 1117 if (reverse) /* backwards patch? */ 1118 if (!pch_swap()) 1119 say("Not enough memory to swap next hunk!\n"); 1120 #ifdef DEBUGGING 1121 if (debug & 2) { 1122 int i; 1123 char special; 1124 1125 for (i = 0; i <= p_end; i++) { 1126 if (i == p_ptrn_lines) 1127 special = '^'; 1128 else 1129 special = ' '; 1130 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1131 special, p_line[i]); 1132 fflush(stderr); 1133 } 1134 } 1135 #endif 1136 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1137 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1138 return true; 1139 } 1140 1141 /* 1142 * Input a line from the patch file, worrying about indentation. 1143 */ 1144 static char * 1145 pgets(char *bf, int sz, FILE *fp) 1146 { 1147 char *s, *ret = fgets(bf, sz, fp); 1148 int indent = 0; 1149 1150 if (p_indent && ret != NULL) { 1151 for (s = buf; 1152 indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X'); 1153 s++) { 1154 if (*s == '\t') 1155 indent += 8 - (indent % 7); 1156 else 1157 indent++; 1158 } 1159 if (buf != s && strlcpy(buf, s, sizeof(buf)) >= sizeof(buf)) 1160 fatal("buffer too small in pgets()\n"); 1161 } 1162 return ret; 1163 } 1164 1165 /* 1166 * Reverse the old and new portions of the current hunk. 1167 */ 1168 bool 1169 pch_swap(void) 1170 { 1171 char **tp_line; /* the text of the hunk */ 1172 short *tp_len; /* length of each line */ 1173 char *tp_char; /* +, -, and ! */ 1174 LINENUM i; 1175 LINENUM n; 1176 bool blankline = false; 1177 char *s; 1178 1179 i = p_first; 1180 p_first = p_newfirst; 1181 p_newfirst = i; 1182 1183 /* make a scratch copy */ 1184 1185 tp_line = p_line; 1186 tp_len = p_len; 1187 tp_char = p_char; 1188 p_line = NULL; /* force set_hunkmax to allocate again */ 1189 p_len = NULL; 1190 p_char = NULL; 1191 set_hunkmax(); 1192 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1193 1194 free(p_line); 1195 p_line = tp_line; 1196 free(p_len); 1197 p_len = tp_len; 1198 free(p_char); 1199 p_char = tp_char; 1200 return false; /* not enough memory to swap hunk! */ 1201 } 1202 /* now turn the new into the old */ 1203 1204 i = p_ptrn_lines + 1; 1205 if (tp_char[i] == '\n') { /* account for possible blank line */ 1206 blankline = true; 1207 i++; 1208 } 1209 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1210 if (p_efake <= i) 1211 n = p_end - i + 1; 1212 else 1213 n = -i; 1214 p_efake += n; 1215 p_bfake += n; 1216 } 1217 for (n = 0; i <= p_end; i++, n++) { 1218 p_line[n] = tp_line[i]; 1219 p_char[n] = tp_char[i]; 1220 if (p_char[n] == '+') 1221 p_char[n] = '-'; 1222 p_len[n] = tp_len[i]; 1223 } 1224 if (blankline) { 1225 i = p_ptrn_lines + 1; 1226 p_line[n] = tp_line[i]; 1227 p_char[n] = tp_char[i]; 1228 p_len[n] = tp_len[i]; 1229 n++; 1230 } 1231 if (p_char[0] != '=') 1232 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1233 p_input_line, p_char[0]); 1234 p_char[0] = '*'; 1235 for (s = p_line[0]; *s; s++) 1236 if (*s == '-') 1237 *s = '*'; 1238 1239 /* now turn the old into the new */ 1240 1241 if (p_char[0] != '*') 1242 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1243 p_input_line, p_char[0]); 1244 tp_char[0] = '='; 1245 for (s = tp_line[0]; *s; s++) 1246 if (*s == '*') 1247 *s = '-'; 1248 for (i = 0; n <= p_end; i++, n++) { 1249 p_line[n] = tp_line[i]; 1250 p_char[n] = tp_char[i]; 1251 if (p_char[n] == '-') 1252 p_char[n] = '+'; 1253 p_len[n] = tp_len[i]; 1254 } 1255 1256 if (i != p_ptrn_lines + 1) 1257 fatal("Malformed patch at line %ld: expected %ld lines, " 1258 "got %ld\n", 1259 p_input_line, p_ptrn_lines + 1, i); 1260 1261 i = p_ptrn_lines; 1262 p_ptrn_lines = p_repl_lines; 1263 p_repl_lines = i; 1264 1265 free(tp_line); 1266 free(tp_len); 1267 free(tp_char); 1268 1269 return true; 1270 } 1271 1272 /* 1273 * Return the specified line position in the old file of the old context. 1274 */ 1275 LINENUM 1276 pch_first(void) 1277 { 1278 return p_first; 1279 } 1280 1281 /* 1282 * Return the number of lines of old context. 1283 */ 1284 LINENUM 1285 pch_ptrn_lines(void) 1286 { 1287 return p_ptrn_lines; 1288 } 1289 1290 /* 1291 * Return the probable line position in the new file of the first line. 1292 */ 1293 LINENUM 1294 pch_newfirst(void) 1295 { 1296 return p_newfirst; 1297 } 1298 1299 /* 1300 * Return the number of lines in the replacement text including context. 1301 */ 1302 LINENUM 1303 pch_repl_lines(void) 1304 { 1305 return p_repl_lines; 1306 } 1307 1308 /* 1309 * Return the number of lines in the whole hunk. 1310 */ 1311 LINENUM 1312 pch_end(void) 1313 { 1314 return p_end; 1315 } 1316 1317 /* 1318 * Return the number of context lines before the first changed line. 1319 */ 1320 LINENUM 1321 pch_context(void) 1322 { 1323 return p_context; 1324 } 1325 1326 /* 1327 * Return the length of a particular patch line. 1328 */ 1329 short 1330 pch_line_len(LINENUM line) 1331 { 1332 return p_len[line]; 1333 } 1334 1335 /* 1336 * Return the control character (+, -, *, !, etc) for a patch line. 1337 */ 1338 char 1339 pch_char(LINENUM line) 1340 { 1341 return p_char[line]; 1342 } 1343 1344 /* 1345 * Return a pointer to a particular patch line. 1346 */ 1347 char * 1348 pfetch(LINENUM line) 1349 { 1350 return p_line[line]; 1351 } 1352 1353 /* 1354 * Return where in the patch file this hunk began, for error messages. 1355 */ 1356 LINENUM 1357 pch_hunk_beg(void) 1358 { 1359 return p_hunk_beg; 1360 } 1361 1362 /* 1363 * Apply an ed script by feeding ed itself. 1364 */ 1365 void 1366 do_ed_script(void) 1367 { 1368 char *t; 1369 long beginning_of_this_line; 1370 FILE *pipefp = NULL; 1371 1372 if (!skip_rest_of_patch) { 1373 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1374 unlink(TMPOUTNAME); 1375 fatal("can't create temp file %s", TMPOUTNAME); 1376 } 1377 snprintf(buf, sizeof buf, "%s%s%s", _PATH_ED, 1378 verbose ? " " : " -s ", TMPOUTNAME); 1379 pipefp = popen(buf, "w"); 1380 } 1381 for (;;) { 1382 beginning_of_this_line = ftell(pfp); 1383 if (pgets(buf, sizeof buf, pfp) == NULL) { 1384 next_intuit_at(beginning_of_this_line, p_input_line); 1385 break; 1386 } 1387 p_input_line++; 1388 for (t = buf; isdigit(*t) || *t == ','; t++) 1389 ; 1390 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1391 if (isdigit(*buf) && (*t == 'a' || *t == 'c' || *t == 'd' || 1392 *t == 'i' || *t == 's')) { 1393 if (pipefp != NULL) 1394 fputs(buf, pipefp); 1395 if (*t != 'd') { 1396 while (pgets(buf, sizeof buf, pfp) != NULL) { 1397 p_input_line++; 1398 if (pipefp != NULL) 1399 fputs(buf, pipefp); 1400 if (strEQ(buf, ".\n")) 1401 break; 1402 } 1403 } 1404 } else { 1405 next_intuit_at(beginning_of_this_line, p_input_line); 1406 break; 1407 } 1408 } 1409 if (pipefp == NULL) 1410 return; 1411 fprintf(pipefp, "w\n"); 1412 fprintf(pipefp, "q\n"); 1413 fflush(pipefp); 1414 pclose(pipefp); 1415 ignore_signals(); 1416 if (!check_only) { 1417 if (move_file(TMPOUTNAME, outname) < 0) { 1418 toutkeep = true; 1419 chmod(TMPOUTNAME, filemode); 1420 } else 1421 chmod(outname, filemode); 1422 } 1423 set_signals(1); 1424 } 1425 1426 /* 1427 * Choose the name of the file to be patched based on POSIX rules. 1428 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1429 * if the user specified --posix or set POSIXLY_CORRECT. 1430 */ 1431 static char * 1432 posix_name(const struct file_name *names, bool assume_exists) 1433 { 1434 char *path = NULL; 1435 int i; 1436 1437 /* 1438 * POSIX states that the filename will be chosen from one 1439 * of the old, new and index names (in that order) if 1440 * the file exists relative to CWD after -p stripping. 1441 */ 1442 for (i = 0; i < MAX_FILE; i++) { 1443 if (names[i].path != NULL && names[i].exists) { 1444 path = names[i].path; 1445 break; 1446 } 1447 } 1448 if (path == NULL && !assume_exists) { 1449 /* 1450 * No files found, look for something we can checkout from 1451 * RCS/SCCS dirs. Same order as above. 1452 */ 1453 for (i = 0; i < MAX_FILE; i++) { 1454 if (names[i].path != NULL && 1455 (path = checked_in(names[i].path)) != NULL) 1456 break; 1457 } 1458 /* 1459 * Still no match? Check to see if the diff could be creating 1460 * a new file. 1461 */ 1462 if (path == NULL && ok_to_create_file && 1463 names[NEW_FILE].path != NULL) 1464 path = names[NEW_FILE].path; 1465 } 1466 1467 return path ? savestr(path) : NULL; 1468 } 1469 1470 /* 1471 * Choose the name of the file to be patched based the "best" one 1472 * available. 1473 */ 1474 static char * 1475 best_name(const struct file_name *names, bool assume_exists) 1476 { 1477 size_t min_components, min_baselen, min_len, tmp; 1478 char *best = NULL; 1479 int i; 1480 1481 /* 1482 * The "best" name is the one with the fewest number of path 1483 * components, the shortest basename length, and the shortest 1484 * overall length (in that order). We only use the Index: file 1485 * if neither of the old or new files could be intuited from 1486 * the diff header. 1487 */ 1488 min_components = min_baselen = min_len = SIZE_MAX; 1489 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1490 if (names[i].path == NULL || 1491 (!names[i].exists && !assume_exists)) 1492 continue; 1493 if ((tmp = num_components(names[i].path)) > min_components) 1494 continue; 1495 min_components = tmp; 1496 if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1497 continue; 1498 min_baselen = tmp; 1499 if ((tmp = strlen(names[i].path)) > min_len) 1500 continue; 1501 min_len = tmp; 1502 best = names[i].path; 1503 } 1504 if (best == NULL) { 1505 /* 1506 * No files found, look for something we can checkout from 1507 * RCS/SCCS dirs. Logic is identical to that above... 1508 */ 1509 min_components = min_baselen = min_len = SIZE_MAX; 1510 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1511 if (names[i].path == NULL || 1512 checked_in(names[i].path) == NULL) 1513 continue; 1514 if ((tmp = num_components(names[i].path)) > min_components) 1515 continue; 1516 min_components = tmp; 1517 if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1518 continue; 1519 min_baselen = tmp; 1520 if ((tmp = strlen(names[i].path)) > min_len) 1521 continue; 1522 min_len = tmp; 1523 best = names[i].path; 1524 } 1525 /* 1526 * Still no match? Check to see if the diff could be creating 1527 * a new file. 1528 */ 1529 if (best == NULL && ok_to_create_file && 1530 names[NEW_FILE].path != NULL) 1531 best = names[NEW_FILE].path; 1532 } 1533 1534 return best ? savestr(best) : NULL; 1535 } 1536 1537 static size_t 1538 num_components(const char *path) 1539 { 1540 size_t n; 1541 const char *cp; 1542 1543 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1544 while (*cp == '/') 1545 cp++; /* skip consecutive slashes */ 1546 } 1547 return n; 1548 } 1549