1 /* 2 * $OpenBSD: pch.c,v 1.35 2004/08/05 21:47:24 deraadt Exp $ 3 * $DragonFly: src/usr.bin/patch/pch.c,v 1.4 2006/04/18 22:11:35 joerg Exp $ 4 */ 5 6 /* 7 * patch - a program to apply diffs to original files 8 * 9 * Copyright 1986, Larry Wall 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following condition is met: 13 * 1. Redistributions of source code must retain the above copyright notice, 14 * this condition and the following disclaimer. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 29 * behaviour 30 */ 31 32 #include <sys/types.h> 33 #include <sys/stat.h> 34 35 #include <ctype.h> 36 #include <libgen.h> 37 #include <limits.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #include "common.h" 44 #include "util.h" 45 #include "pch.h" 46 #include "pathnames.h" 47 48 /* Patch (diff listing) abstract type. */ 49 50 static long p_filesize; /* size of the patch file */ 51 static LINENUM p_first; /* 1st line number */ 52 static LINENUM p_newfirst; /* 1st line number of replacement */ 53 static LINENUM p_ptrn_lines; /* # lines in pattern */ 54 static LINENUM p_repl_lines; /* # lines in replacement text */ 55 static LINENUM p_end = -1; /* last line in hunk */ 56 static LINENUM p_max; /* max allowed value of p_end */ 57 static LINENUM p_context = 3; /* # of context lines */ 58 static LINENUM p_input_line = 0; /* current line # from patch file */ 59 static char **p_line = NULL;/* the text of the hunk */ 60 static short *p_len = NULL; /* length of each line */ 61 static char *p_char = NULL; /* +, -, and ! */ 62 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 63 static int p_indent; /* indent to patch */ 64 static LINENUM p_base; /* where to intuit this time */ 65 static LINENUM p_bline; /* line # of p_base */ 66 static LINENUM p_start; /* where intuit found a patch */ 67 static LINENUM p_sline; /* and the line number for it */ 68 static LINENUM p_hunk_beg; /* line number of current hunk */ 69 static LINENUM p_efake = -1; /* end of faked up lines--don't free */ 70 static LINENUM p_bfake = -1; /* beg of faked up lines */ 71 static FILE *pfp = NULL; /* patch file pointer */ 72 static char *bestguess = NULL; /* guess at correct filename */ 73 74 static void grow_hunkmax(void); 75 static int intuit_diff_type(void); 76 static void next_intuit_at(LINENUM, LINENUM); 77 static void skip_to(LINENUM, LINENUM); 78 static char *pgets(char *, int, FILE *); 79 static char *best_name(const struct file_name *, bool); 80 static char *posix_name(const struct file_name *, bool); 81 static size_t num_components(const char *); 82 83 /* 84 * Prepare to look for the next patch in the patch file. 85 */ 86 void 87 re_patch(void) 88 { 89 p_first = 0; 90 p_newfirst = 0; 91 p_ptrn_lines = 0; 92 p_repl_lines = 0; 93 p_end = (LINENUM) - 1; 94 p_max = 0; 95 p_indent = 0; 96 } 97 98 /* 99 * Open the patch file at the beginning of time. 100 */ 101 void 102 open_patch_file(const char *filename) 103 { 104 struct stat filestat; 105 106 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 107 pfp = fopen(TMPPATNAME, "w"); 108 if (pfp == NULL) 109 pfatal("can't create %s", TMPPATNAME); 110 while (fgets(buf, buf_len, stdin) != NULL) 111 fputs(buf, pfp); 112 fclose(pfp); 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 = malloc((size_t) hunkmax * sizeof(char *)); 132 if (p_len == NULL) 133 p_len = malloc((size_t) hunkmax * sizeof(short)); 134 if (p_char == NULL) 135 p_char = malloc((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 /* Determine what kind of diff is in the remaining part of the patch file. */ 245 246 static int 247 intuit_diff_type(void) 248 { 249 long this_line = 0, previous_line; 250 long first_command_line = -1; 251 LINENUM fcl_line = -1; 252 bool last_line_was_command = false, this_is_a_command = false; 253 bool stars_last_line = false, stars_this_line = false; 254 char *s, *t; 255 int indent, retval; 256 struct file_name names[MAX_FILE]; 257 258 memset(names, 0, sizeof(names)); 259 ok_to_create_file = false; 260 fseek(pfp, p_base, SEEK_SET); 261 p_input_line = p_bline - 1; 262 for (;;) { 263 previous_line = this_line; 264 last_line_was_command = this_is_a_command; 265 stars_last_line = stars_this_line; 266 this_line = ftell(pfp); 267 indent = 0; 268 p_input_line++; 269 if (fgets(buf, buf_len, pfp) == NULL) { 270 if (first_command_line >= 0L) { 271 /* nothing but deletes!? */ 272 p_start = first_command_line; 273 p_sline = fcl_line; 274 retval = ED_DIFF; 275 goto scan_exit; 276 } else { 277 p_start = this_line; 278 p_sline = p_input_line; 279 retval = 0; 280 goto scan_exit; 281 } 282 } 283 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 284 if (*s == '\t') 285 indent += 8 - (indent % 8); 286 else 287 indent++; 288 } 289 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 290 ; 291 this_is_a_command = (isdigit((unsigned char)*s) && 292 (*t == 'd' || *t == 'c' || *t == 'a')); 293 if (first_command_line < 0L && this_is_a_command) { 294 first_command_line = this_line; 295 fcl_line = p_input_line; 296 p_indent = indent; /* assume this for now */ 297 } 298 if (!stars_last_line && strnEQ(s, "*** ", 4)) 299 names[OLD_FILE].path = fetchname(s + 4, 300 &names[OLD_FILE].exists, strippath); 301 else if (strnEQ(s, "--- ", 4)) 302 names[NEW_FILE].path = fetchname(s + 4, 303 &names[NEW_FILE].exists, strippath); 304 else if (strnEQ(s, "+++ ", 4)) 305 /* pretend it is the old name */ 306 names[OLD_FILE].path = fetchname(s + 4, 307 &names[OLD_FILE].exists, strippath); 308 else if (strnEQ(s, "Index:", 6)) 309 names[INDEX_FILE].path = fetchname(s + 6, 310 &names[INDEX_FILE].exists, strippath); 311 else if (strnEQ(s, "Prereq:", 7)) { 312 for (t = s + 7; isspace((unsigned char)*t); t++) 313 ; 314 revision = savestr(t); 315 for (t = revision; *t && !isspace((unsigned char)*t); t++) 316 ; 317 *t = '\0'; 318 if (*revision == '\0') { 319 free(revision); 320 revision = NULL; 321 } 322 } 323 if ((!diff_type || diff_type == ED_DIFF) && 324 first_command_line >= 0L && 325 strEQ(s, ".\n")) { 326 p_indent = indent; 327 p_start = first_command_line; 328 p_sline = fcl_line; 329 retval = ED_DIFF; 330 goto scan_exit; 331 } 332 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 333 if (strnEQ(s + 4, "0,0", 3)) 334 ok_to_create_file = true; 335 p_indent = indent; 336 p_start = this_line; 337 p_sline = p_input_line; 338 retval = UNI_DIFF; 339 goto scan_exit; 340 } 341 stars_this_line = strnEQ(s, "********", 8); 342 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 343 strnEQ(s, "*** ", 4)) { 344 if (atol(s + 4) == 0) 345 ok_to_create_file = true; 346 /* 347 * If this is a new context diff the character just 348 * before the newline is a '*'. 349 */ 350 while (*s != '\n') 351 s++; 352 p_indent = indent; 353 p_start = previous_line; 354 p_sline = p_input_line - 1; 355 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 356 goto scan_exit; 357 } 358 if ((!diff_type || diff_type == NORMAL_DIFF) && 359 last_line_was_command && 360 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 361 p_start = previous_line; 362 p_sline = p_input_line - 1; 363 p_indent = indent; 364 retval = NORMAL_DIFF; 365 goto scan_exit; 366 } 367 } 368 scan_exit: 369 if (retval == UNI_DIFF) { 370 /* unswap old and new */ 371 struct file_name tmp = names[OLD_FILE]; 372 names[OLD_FILE] = names[NEW_FILE]; 373 names[NEW_FILE] = tmp; 374 } 375 if (filearg[0] == NULL) { 376 if (posix) 377 filearg[0] = posix_name(names, ok_to_create_file); 378 else { 379 /* Ignore the Index: name for context diffs, like GNU */ 380 if (names[OLD_FILE].path != NULL || 381 names[NEW_FILE].path != NULL) { 382 free(names[INDEX_FILE].path); 383 names[INDEX_FILE].path = NULL; 384 } 385 filearg[0] = best_name(names, ok_to_create_file); 386 } 387 } 388 389 free(bestguess); 390 bestguess = NULL; 391 if (filearg[0] != NULL) 392 bestguess = savestr(filearg[0]); 393 else if (!ok_to_create_file) { 394 /* 395 * We don't want to create a new file but we need a 396 * filename to set bestguess. Avoid setting filearg[0] 397 * so the file is not created automatically. 398 */ 399 if (posix) 400 bestguess = posix_name(names, true); 401 else 402 bestguess = best_name(names, true); 403 } 404 free(names[OLD_FILE].path); 405 free(names[NEW_FILE].path); 406 free(names[INDEX_FILE].path); 407 return retval; 408 } 409 410 /* 411 * Remember where this patch ends so we know where to start up again. 412 */ 413 static void 414 next_intuit_at(LINENUM file_pos, LINENUM file_line) 415 { 416 p_base = file_pos; 417 p_bline = file_line; 418 } 419 420 /* 421 * Basically a verbose fseek() to the actual diff listing. 422 */ 423 static void 424 skip_to(LINENUM file_pos, LINENUM file_line) 425 { 426 char *ret; 427 428 if (p_base > file_pos) 429 fatal("Internal error: seek %ld>%ld\n", p_base, file_pos); 430 if (verbose && p_base < file_pos) { 431 fseek(pfp, p_base, SEEK_SET); 432 say("The text leading up to this was:\n--------------------------\n"); 433 while (ftell(pfp) < file_pos) { 434 ret = fgets(buf, buf_len, pfp); 435 if (ret == NULL) 436 fatal("Unexpected end of file\n"); 437 say("|%s", buf); 438 } 439 say("--------------------------\n"); 440 } else 441 fseek(pfp, file_pos, SEEK_SET); 442 p_input_line = file_line - 1; 443 } 444 445 /* Make this a function for better debugging. */ 446 static void 447 malformed(void) 448 { 449 fatal("malformed patch at line %ld: %s", p_input_line, buf); 450 /* about as informative as "Syntax error" in C */ 451 } 452 453 /* 454 * True if the line has been discarded (i.e. it is a line saying 455 * "\ No newline at end of file".) 456 */ 457 static bool 458 remove_special_line(void) 459 { 460 int c; 461 462 c = fgetc(pfp); 463 if (c == '\\') { 464 do { 465 c = fgetc(pfp); 466 } while (c != EOF && c != '\n'); 467 468 return true; 469 } 470 if (c != EOF) 471 fseek(pfp, -1L, SEEK_CUR); 472 473 return false; 474 } 475 476 /* 477 * True if there is more of the current diff listing to process. 478 */ 479 bool 480 another_hunk(void) 481 { 482 long line_beginning; /* file pos of the current line */ 483 LINENUM repl_beginning; /* index of --- line */ 484 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 485 LINENUM fillsrc; /* index of first line to copy */ 486 LINENUM filldst; /* index of first missing line */ 487 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 488 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 489 bool repl_missing; /* we are now backtracking */ 490 long repl_backtrack_position; /* file pos of first repl line */ 491 LINENUM repl_patch_line; /* input line number for same */ 492 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 493 char *s, *ret; 494 int context = 0; 495 496 while (p_end >= 0) { 497 if (p_end == p_efake) 498 p_end = p_bfake; /* don't free twice */ 499 else 500 free(p_line[p_end]); 501 p_end--; 502 } 503 p_efake = -1; 504 505 p_max = hunkmax; /* gets reduced when --- found */ 506 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 507 line_beginning = ftell(pfp); 508 repl_beginning = 0; 509 fillcnt = 0; 510 fillsrc = 0; 511 filldst = 0; 512 ptrn_spaces_eaten = false; 513 repl_could_be_missing = true; 514 repl_missing = false; 515 repl_backtrack_position = 0; 516 repl_patch_line = 0; 517 ptrn_copiable = 0; 518 519 ret = pgets(buf, buf_len, pfp); 520 p_input_line++; 521 if (ret == NULL || strnNE(buf, "********", 8)) { 522 next_intuit_at(line_beginning, p_input_line); 523 return false; 524 } 525 p_context = 100; 526 p_hunk_beg = p_input_line + 1; 527 while (p_end < p_max) { 528 line_beginning = ftell(pfp); 529 ret = pgets(buf, buf_len, pfp); 530 p_input_line++; 531 if (ret == NULL) { 532 if (p_max - p_end < 4) { 533 /* assume blank lines got chopped */ 534 strlcpy(buf, " \n", buf_len); 535 } else { 536 if (repl_beginning && repl_could_be_missing) { 537 repl_missing = true; 538 goto hunk_done; 539 } 540 fatal("unexpected end of file in patch\n"); 541 } 542 } 543 p_end++; 544 if (p_end >= hunkmax) 545 fatal("Internal error: hunk larger than hunk " 546 "buffer size"); 547 p_char[p_end] = *buf; 548 p_line[p_end] = NULL; 549 switch (*buf) { 550 case '*': 551 if (strnEQ(buf, "********", 8)) { 552 if (repl_beginning && repl_could_be_missing) { 553 repl_missing = true; 554 goto hunk_done; 555 } else 556 fatal("unexpected end of hunk " 557 "at line %ld\n", 558 p_input_line); 559 } 560 if (p_end != 0) { 561 if (repl_beginning && repl_could_be_missing) { 562 repl_missing = true; 563 goto hunk_done; 564 } 565 fatal("unexpected *** at line %ld: %s", 566 p_input_line, buf); 567 } 568 context = 0; 569 p_line[p_end] = savestr(buf); 570 if (out_of_mem) { 571 p_end--; 572 return false; 573 } 574 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 575 ; 576 if (!*s) 577 malformed(); 578 if (strnEQ(s, "0,0", 3)) 579 memmove(s, s + 2, strlen(s + 2) + 1); 580 p_first = (LINENUM) atol(s); 581 while (isdigit((unsigned char)*s)) 582 s++; 583 if (*s == ',') { 584 for (; *s && !isdigit((unsigned char)*s); s++) 585 ; 586 if (!*s) 587 malformed(); 588 p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1; 589 } else if (p_first) 590 p_ptrn_lines = 1; 591 else { 592 p_ptrn_lines = 0; 593 p_first = 1; 594 } 595 596 /* we need this much at least */ 597 p_max = p_ptrn_lines + 6; 598 while (p_max >= hunkmax) 599 grow_hunkmax(); 600 p_max = hunkmax; 601 break; 602 case '-': 603 if (buf[1] == '-') { 604 if (repl_beginning || 605 (p_end != p_ptrn_lines + 1 + 606 (p_char[p_end - 1] == '\n'))) { 607 if (p_end == 1) { 608 /* 609 * `old' lines were omitted; 610 * set up to fill them in 611 * from 'new' context lines. 612 */ 613 p_end = p_ptrn_lines + 1; 614 fillsrc = p_end + 1; 615 filldst = 1; 616 fillcnt = p_ptrn_lines; 617 } else { 618 if (repl_beginning) { 619 if (repl_could_be_missing) { 620 repl_missing = true; 621 goto hunk_done; 622 } 623 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 624 p_input_line, p_hunk_beg + repl_beginning); 625 } else { 626 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 627 (p_end <= p_ptrn_lines 628 ? "Premature" 629 : "Overdue"), 630 p_input_line, p_hunk_beg); 631 } 632 } 633 } 634 repl_beginning = p_end; 635 repl_backtrack_position = ftell(pfp); 636 repl_patch_line = p_input_line; 637 p_line[p_end] = savestr(buf); 638 if (out_of_mem) { 639 p_end--; 640 return false; 641 } 642 p_char[p_end] = '='; 643 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 644 ; 645 if (!*s) 646 malformed(); 647 p_newfirst = (LINENUM) atol(s); 648 while (isdigit((unsigned char)*s)) 649 s++; 650 if (*s == ',') { 651 for (; *s && !isdigit((unsigned char)*s); s++) 652 ; 653 if (!*s) 654 malformed(); 655 p_repl_lines = ((LINENUM) atol(s)) - 656 p_newfirst + 1; 657 } else if (p_newfirst) 658 p_repl_lines = 1; 659 else { 660 p_repl_lines = 0; 661 p_newfirst = 1; 662 } 663 p_max = p_repl_lines + p_end; 664 if (p_max > MAXHUNKSIZE) 665 fatal("hunk too large (%ld lines) at line %ld: %s", 666 p_max, p_input_line, buf); 667 while (p_max >= hunkmax) 668 grow_hunkmax(); 669 if (p_repl_lines != ptrn_copiable && 670 (p_context != 0 || p_repl_lines != 1)) 671 repl_could_be_missing = false; 672 break; 673 } 674 goto change_line; 675 case '+': 676 case '!': 677 repl_could_be_missing = false; 678 change_line: 679 if (buf[1] == '\n' && canonicalize) 680 strlcpy(buf + 1, " \n", buf_len - 1); 681 if (!isspace((unsigned char)buf[1]) && buf[1] != '>' && 682 buf[1] != '<' && 683 repl_beginning && repl_could_be_missing) { 684 repl_missing = true; 685 goto hunk_done; 686 } 687 if (context >= 0) { 688 if (context < p_context) 689 p_context = context; 690 context = -1000; 691 } 692 p_line[p_end] = savestr(buf + 2); 693 if (out_of_mem) { 694 p_end--; 695 return false; 696 } 697 if (p_end == p_ptrn_lines) { 698 if (remove_special_line()) { 699 int len; 700 701 len = strlen(p_line[p_end]) - 1; 702 (p_line[p_end])[len] = 0; 703 } 704 } 705 break; 706 case '\t': 707 case '\n': /* assume the 2 spaces got eaten */ 708 if (repl_beginning && repl_could_be_missing && 709 (!ptrn_spaces_eaten || 710 diff_type == NEW_CONTEXT_DIFF)) { 711 repl_missing = true; 712 goto hunk_done; 713 } 714 p_line[p_end] = savestr(buf); 715 if (out_of_mem) { 716 p_end--; 717 return false; 718 } 719 if (p_end != p_ptrn_lines + 1) { 720 ptrn_spaces_eaten |= (repl_beginning != 0); 721 context++; 722 if (!repl_beginning) 723 ptrn_copiable++; 724 p_char[p_end] = ' '; 725 } 726 break; 727 case ' ': 728 if (!isspace((unsigned char)buf[1]) && 729 repl_beginning && repl_could_be_missing) { 730 repl_missing = true; 731 goto hunk_done; 732 } 733 context++; 734 if (!repl_beginning) 735 ptrn_copiable++; 736 p_line[p_end] = savestr(buf + 2); 737 if (out_of_mem) { 738 p_end--; 739 return false; 740 } 741 break; 742 default: 743 if (repl_beginning && repl_could_be_missing) { 744 repl_missing = true; 745 goto hunk_done; 746 } 747 malformed(); 748 } 749 /* set up p_len for strncmp() so we don't have to */ 750 /* assume null termination */ 751 if (p_line[p_end]) 752 p_len[p_end] = strlen(p_line[p_end]); 753 else 754 p_len[p_end] = 0; 755 } 756 757 hunk_done: 758 if (p_end >= 0 && !repl_beginning) 759 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 760 761 if (repl_missing) { 762 763 /* reset state back to just after --- */ 764 p_input_line = repl_patch_line; 765 for (p_end--; p_end > repl_beginning; p_end--) 766 free(p_line[p_end]); 767 fseek(pfp, repl_backtrack_position, SEEK_SET); 768 769 /* redundant 'new' context lines were omitted - set */ 770 /* up to fill them in from the old file context */ 771 if (!p_context && p_repl_lines == 1) { 772 p_repl_lines = 0; 773 p_max--; 774 } 775 fillsrc = 1; 776 filldst = repl_beginning + 1; 777 fillcnt = p_repl_lines; 778 p_end = p_max; 779 } else if (!p_context && fillcnt == 1) { 780 /* the first hunk was a null hunk with no context */ 781 /* and we were expecting one line -- fix it up. */ 782 while (filldst < p_end) { 783 p_line[filldst] = p_line[filldst + 1]; 784 p_char[filldst] = p_char[filldst + 1]; 785 p_len[filldst] = p_len[filldst + 1]; 786 filldst++; 787 } 788 #if 0 789 repl_beginning--; /* this doesn't need to be fixed */ 790 #endif 791 p_end--; 792 p_first++; /* do append rather than insert */ 793 fillcnt = 0; 794 p_ptrn_lines = 0; 795 } 796 if (diff_type == CONTEXT_DIFF && 797 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 798 if (verbose) 799 say("%s\n%s\n%s\n", 800 "(Fascinating--this is really a new-style context diff but without", 801 "the telltale extra asterisks on the *** line that usually indicate", 802 "the new style...)"); 803 diff_type = NEW_CONTEXT_DIFF; 804 } 805 /* if there were omitted context lines, fill them in now */ 806 if (fillcnt) { 807 p_bfake = filldst; /* remember where not to free() */ 808 p_efake = filldst + fillcnt - 1; 809 while (fillcnt-- > 0) { 810 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 811 fillsrc++; 812 if (fillsrc > p_end) 813 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 814 p_hunk_beg); 815 p_line[filldst] = p_line[fillsrc]; 816 p_char[filldst] = p_char[fillsrc]; 817 p_len[filldst] = p_len[fillsrc]; 818 fillsrc++; 819 filldst++; 820 } 821 while (fillsrc <= p_end && fillsrc != repl_beginning && 822 p_char[fillsrc] != ' ') 823 fillsrc++; 824 #ifdef DEBUGGING 825 if (debug & 64) 826 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 827 fillsrc, filldst, repl_beginning, p_end + 1); 828 #endif 829 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 830 malformed(); 831 if (filldst != p_end + 1 && filldst != repl_beginning) 832 malformed(); 833 } 834 if (p_line[p_end] != NULL) { 835 if (remove_special_line()) { 836 p_len[p_end] -= 1; 837 (p_line[p_end])[p_len[p_end]] = 0; 838 } 839 } 840 } else if (diff_type == UNI_DIFF) { 841 LINENUM fillold; /* index of old lines */ 842 LINENUM fillnew; /* index of new lines */ 843 char ch; 844 845 line_beginning = ftell(pfp); /* file pos of the current line */ 846 ret = pgets(buf, buf_len, pfp); 847 p_input_line++; 848 if (ret == NULL || strnNE(buf, "@@ -", 4)) { 849 next_intuit_at(line_beginning, p_input_line); 850 return false; 851 } 852 s = buf + 4; 853 if (!*s) 854 malformed(); 855 p_first = (LINENUM) atol(s); 856 while (isdigit((unsigned char)*s)) 857 s++; 858 if (*s == ',') { 859 p_ptrn_lines = (LINENUM) atol(++s); 860 while (isdigit((unsigned char)*s)) 861 s++; 862 } else 863 p_ptrn_lines = 1; 864 if (*s == ' ') 865 s++; 866 if (*s != '+' || !*++s) 867 malformed(); 868 p_newfirst = (LINENUM) atol(s); 869 while (isdigit((unsigned char)*s)) 870 s++; 871 if (*s == ',') { 872 p_repl_lines = (LINENUM) atol(++s); 873 while (isdigit((unsigned char)*s)) 874 s++; 875 } else 876 p_repl_lines = 1; 877 if (*s == ' ') 878 s++; 879 if (*s != '@') 880 malformed(); 881 if (!p_ptrn_lines) 882 p_first++; /* do append rather than insert */ 883 p_max = p_ptrn_lines + p_repl_lines + 1; 884 while (p_max >= hunkmax) 885 grow_hunkmax(); 886 fillold = 1; 887 fillnew = fillold + p_ptrn_lines; 888 p_end = fillnew + p_repl_lines; 889 snprintf(buf, buf_len, "*** %ld,%ld ****\n", p_first, 890 p_first + p_ptrn_lines - 1); 891 p_line[0] = savestr(buf); 892 if (out_of_mem) { 893 p_end = -1; 894 return false; 895 } 896 p_char[0] = '*'; 897 snprintf(buf, buf_len, "--- %ld,%ld ----\n", p_newfirst, 898 p_newfirst + p_repl_lines - 1); 899 p_line[fillnew] = savestr(buf); 900 if (out_of_mem) { 901 p_end = 0; 902 return false; 903 } 904 p_char[fillnew++] = '='; 905 p_context = 100; 906 context = 0; 907 p_hunk_beg = p_input_line + 1; 908 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 909 line_beginning = ftell(pfp); 910 ret = pgets(buf, buf_len, pfp); 911 p_input_line++; 912 if (ret == NULL) { 913 if (p_max - fillnew < 3) { 914 /* assume blank lines got chopped */ 915 strlcpy(buf, " \n", buf_len); 916 } else { 917 fatal("unexpected end of file in patch\n"); 918 } 919 } 920 if (*buf == '\t' || *buf == '\n') { 921 ch = ' '; /* assume the space got eaten */ 922 s = savestr(buf); 923 } else { 924 ch = *buf; 925 s = savestr(buf + 1); 926 } 927 if (out_of_mem) { 928 while (--fillnew > p_ptrn_lines) 929 free(p_line[fillnew]); 930 p_end = fillold - 1; 931 return false; 932 } 933 switch (ch) { 934 case '-': 935 if (fillold > p_ptrn_lines) { 936 free(s); 937 p_end = fillnew - 1; 938 malformed(); 939 } 940 p_char[fillold] = ch; 941 p_line[fillold] = s; 942 p_len[fillold++] = strlen(s); 943 if (fillold > p_ptrn_lines) { 944 if (remove_special_line()) { 945 p_len[fillold - 1] -= 1; 946 s[p_len[fillold - 1]] = 0; 947 } 948 } 949 break; 950 case '=': 951 ch = ' '; 952 /* FALL THROUGH */ 953 case ' ': 954 if (fillold > p_ptrn_lines) { 955 free(s); 956 while (--fillnew > p_ptrn_lines) 957 free(p_line[fillnew]); 958 p_end = fillold - 1; 959 malformed(); 960 } 961 context++; 962 p_char[fillold] = ch; 963 p_line[fillold] = s; 964 p_len[fillold++] = strlen(s); 965 s = savestr(s); 966 if (out_of_mem) { 967 while (--fillnew > p_ptrn_lines) 968 free(p_line[fillnew]); 969 p_end = fillold - 1; 970 return false; 971 } 972 if (fillold > p_ptrn_lines) { 973 if (remove_special_line()) { 974 p_len[fillold - 1] -= 1; 975 s[p_len[fillold - 1]] = 0; 976 } 977 } 978 /* FALL THROUGH */ 979 case '+': 980 if (fillnew > p_end) { 981 free(s); 982 while (--fillnew > p_ptrn_lines) 983 free(p_line[fillnew]); 984 p_end = fillold - 1; 985 malformed(); 986 } 987 p_char[fillnew] = ch; 988 p_line[fillnew] = s; 989 p_len[fillnew++] = strlen(s); 990 if (fillold > p_ptrn_lines) { 991 if (remove_special_line()) { 992 p_len[fillnew - 1] -= 1; 993 s[p_len[fillnew - 1]] = 0; 994 } 995 } 996 break; 997 default: 998 p_end = fillnew; 999 malformed(); 1000 } 1001 if (ch != ' ' && context > 0) { 1002 if (context < p_context) 1003 p_context = context; 1004 context = -1000; 1005 } 1006 } /* while */ 1007 } else { /* normal diff--fake it up */ 1008 char hunk_type; 1009 int i; 1010 LINENUM min, max; 1011 1012 line_beginning = ftell(pfp); 1013 p_context = 0; 1014 ret = pgets(buf, buf_len, pfp); 1015 p_input_line++; 1016 if (ret == NULL || !isdigit((unsigned char)*buf)) { 1017 next_intuit_at(line_beginning, p_input_line); 1018 return false; 1019 } 1020 p_first = (LINENUM) atol(buf); 1021 for (s = buf; isdigit((unsigned char)*s); s++) 1022 ; 1023 if (*s == ',') { 1024 p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1; 1025 while (isdigit((unsigned char)*s)) 1026 s++; 1027 } else 1028 p_ptrn_lines = (*s != 'a'); 1029 hunk_type = *s; 1030 if (hunk_type == 'a') 1031 p_first++; /* do append rather than insert */ 1032 min = (LINENUM) atol(++s); 1033 for (; isdigit((unsigned char)*s); s++) 1034 ; 1035 if (*s == ',') 1036 max = (LINENUM) atol(++s); 1037 else 1038 max = min; 1039 if (hunk_type == 'd') 1040 min++; 1041 p_end = p_ptrn_lines + 1 + max - min + 1; 1042 if (p_end > MAXHUNKSIZE) 1043 fatal("hunk too large (%ld lines) at line %ld: %s", 1044 p_end, p_input_line, buf); 1045 while (p_end >= hunkmax) 1046 grow_hunkmax(); 1047 p_newfirst = min; 1048 p_repl_lines = max - min + 1; 1049 snprintf(buf, buf_len, "*** %ld,%ld\n", p_first, 1050 p_first + p_ptrn_lines - 1); 1051 p_line[0] = savestr(buf); 1052 if (out_of_mem) { 1053 p_end = -1; 1054 return false; 1055 } 1056 p_char[0] = '*'; 1057 for (i = 1; i <= p_ptrn_lines; i++) { 1058 ret = pgets(buf, buf_len, pfp); 1059 p_input_line++; 1060 if (ret == NULL) 1061 fatal("unexpected end of file in patch at line %ld\n", 1062 p_input_line); 1063 if (*buf != '<') 1064 fatal("< expected at line %ld of patch\n", 1065 p_input_line); 1066 p_line[i] = savestr(buf + 2); 1067 if (out_of_mem) { 1068 p_end = i - 1; 1069 return false; 1070 } 1071 p_len[i] = strlen(p_line[i]); 1072 p_char[i] = '-'; 1073 } 1074 1075 if (remove_special_line()) { 1076 p_len[i - 1] -= 1; 1077 (p_line[i - 1])[p_len[i - 1]] = 0; 1078 } 1079 if (hunk_type == 'c') { 1080 ret = pgets(buf, buf_len, pfp); 1081 p_input_line++; 1082 if (ret == NULL) 1083 fatal("unexpected end of file in patch at line %ld\n", 1084 p_input_line); 1085 if (*buf != '-') 1086 fatal("--- expected at line %ld of patch\n", 1087 p_input_line); 1088 } 1089 snprintf(buf, buf_len, "--- %ld,%ld\n", min, max); 1090 p_line[i] = savestr(buf); 1091 if (out_of_mem) { 1092 p_end = i - 1; 1093 return false; 1094 } 1095 p_char[i] = '='; 1096 for (i++; i <= p_end; i++) { 1097 ret = pgets(buf, buf_len, pfp); 1098 p_input_line++; 1099 if (ret == NULL) 1100 fatal("unexpected end of file in patch at line %ld\n", 1101 p_input_line); 1102 if (*buf != '>') 1103 fatal("> expected at line %ld of patch\n", 1104 p_input_line); 1105 p_line[i] = savestr(buf + 2); 1106 if (out_of_mem) { 1107 p_end = i - 1; 1108 return false; 1109 } 1110 p_len[i] = strlen(p_line[i]); 1111 p_char[i] = '+'; 1112 } 1113 1114 if (remove_special_line()) { 1115 p_len[i - 1] -= 1; 1116 (p_line[i - 1])[p_len[i - 1]] = 0; 1117 } 1118 } 1119 if (reverse) /* backwards patch? */ 1120 if (!pch_swap()) 1121 say("Not enough memory to swap next hunk!\n"); 1122 #ifdef DEBUGGING 1123 if (debug & 2) { 1124 int i; 1125 char special; 1126 1127 for (i = 0; i <= p_end; i++) { 1128 if (i == p_ptrn_lines) 1129 special = '^'; 1130 else 1131 special = ' '; 1132 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1133 special, p_line[i]); 1134 fflush(stderr); 1135 } 1136 } 1137 #endif 1138 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1139 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1140 return true; 1141 } 1142 1143 /* 1144 * Input a line from the patch file, worrying about indentation. 1145 */ 1146 static char * 1147 pgets(char *bf, int sz, FILE *fp) 1148 { 1149 char *s, *ret = fgets(bf, sz, fp); 1150 int indent = 0; 1151 1152 if (p_indent && ret != NULL) { 1153 for (s = buf; 1154 indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X'); 1155 s++) { 1156 if (*s == '\t') 1157 indent += 8 - (indent % 7); 1158 else 1159 indent++; 1160 } 1161 if (buf != s && strlcpy(buf, s, buf_len) >= buf_len) 1162 fatal("buffer too small in pgets()\n"); 1163 } 1164 return ret; 1165 } 1166 1167 /* 1168 * Reverse the old and new portions of the current hunk. 1169 */ 1170 bool 1171 pch_swap(void) 1172 { 1173 char **tp_line; /* the text of the hunk */ 1174 short *tp_len; /* length of each line */ 1175 char *tp_char; /* +, -, and ! */ 1176 LINENUM i; 1177 LINENUM n; 1178 bool blankline = false; 1179 char *s; 1180 1181 i = p_first; 1182 p_first = p_newfirst; 1183 p_newfirst = i; 1184 1185 /* make a scratch copy */ 1186 1187 tp_line = p_line; 1188 tp_len = p_len; 1189 tp_char = p_char; 1190 p_line = NULL; /* force set_hunkmax to allocate again */ 1191 p_len = NULL; 1192 p_char = NULL; 1193 set_hunkmax(); 1194 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1195 1196 free(p_line); 1197 p_line = tp_line; 1198 free(p_len); 1199 p_len = tp_len; 1200 free(p_char); 1201 p_char = tp_char; 1202 return false; /* not enough memory to swap hunk! */ 1203 } 1204 /* now turn the new into the old */ 1205 1206 i = p_ptrn_lines + 1; 1207 if (tp_char[i] == '\n') { /* account for possible blank line */ 1208 blankline = true; 1209 i++; 1210 } 1211 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1212 if (p_efake <= i) 1213 n = p_end - i + 1; 1214 else 1215 n = -i; 1216 p_efake += n; 1217 p_bfake += n; 1218 } 1219 for (n = 0; i <= p_end; i++, n++) { 1220 p_line[n] = tp_line[i]; 1221 p_char[n] = tp_char[i]; 1222 if (p_char[n] == '+') 1223 p_char[n] = '-'; 1224 p_len[n] = tp_len[i]; 1225 } 1226 if (blankline) { 1227 i = p_ptrn_lines + 1; 1228 p_line[n] = tp_line[i]; 1229 p_char[n] = tp_char[i]; 1230 p_len[n] = tp_len[i]; 1231 n++; 1232 } 1233 if (p_char[0] != '=') 1234 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1235 p_input_line, p_char[0]); 1236 p_char[0] = '*'; 1237 for (s = p_line[0]; *s; s++) 1238 if (*s == '-') 1239 *s = '*'; 1240 1241 /* now turn the old into the new */ 1242 1243 if (p_char[0] != '*') 1244 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1245 p_input_line, p_char[0]); 1246 tp_char[0] = '='; 1247 for (s = tp_line[0]; *s; s++) 1248 if (*s == '*') 1249 *s = '-'; 1250 for (i = 0; n <= p_end; i++, n++) { 1251 p_line[n] = tp_line[i]; 1252 p_char[n] = tp_char[i]; 1253 if (p_char[n] == '-') 1254 p_char[n] = '+'; 1255 p_len[n] = tp_len[i]; 1256 } 1257 1258 if (i != p_ptrn_lines + 1) 1259 fatal("Malformed patch at line %ld: expected %ld lines, " 1260 "got %ld\n", 1261 p_input_line, p_ptrn_lines + 1, i); 1262 1263 i = p_ptrn_lines; 1264 p_ptrn_lines = p_repl_lines; 1265 p_repl_lines = i; 1266 1267 free(tp_line); 1268 free(tp_len); 1269 free(tp_char); 1270 1271 return true; 1272 } 1273 1274 /* 1275 * Return the specified line position in the old file of the old context. 1276 */ 1277 LINENUM 1278 pch_first(void) 1279 { 1280 return p_first; 1281 } 1282 1283 /* 1284 * Return the number of lines of old context. 1285 */ 1286 LINENUM 1287 pch_ptrn_lines(void) 1288 { 1289 return p_ptrn_lines; 1290 } 1291 1292 /* 1293 * Return the probable line position in the new file of the first line. 1294 */ 1295 LINENUM 1296 pch_newfirst(void) 1297 { 1298 return p_newfirst; 1299 } 1300 1301 /* 1302 * Return the number of lines in the replacement text including context. 1303 */ 1304 LINENUM 1305 pch_repl_lines(void) 1306 { 1307 return p_repl_lines; 1308 } 1309 1310 /* 1311 * Return the number of lines in the whole hunk. 1312 */ 1313 LINENUM 1314 pch_end(void) 1315 { 1316 return p_end; 1317 } 1318 1319 /* 1320 * Return the number of context lines before the first changed line. 1321 */ 1322 LINENUM 1323 pch_context(void) 1324 { 1325 return p_context; 1326 } 1327 1328 /* 1329 * Return the length of a particular patch line. 1330 */ 1331 short 1332 pch_line_len(LINENUM line) 1333 { 1334 return p_len[line]; 1335 } 1336 1337 /* 1338 * Return the control character (+, -, *, !, etc) for a patch line. 1339 */ 1340 char 1341 pch_char(LINENUM line) 1342 { 1343 return p_char[line]; 1344 } 1345 1346 /* 1347 * Return a pointer to a particular patch line. 1348 */ 1349 char * 1350 pfetch(LINENUM line) 1351 { 1352 return p_line[line]; 1353 } 1354 1355 /* 1356 * Return where in the patch file this hunk began, for error messages. 1357 */ 1358 LINENUM 1359 pch_hunk_beg(void) 1360 { 1361 return p_hunk_beg; 1362 } 1363 1364 /* 1365 * Apply an ed script by feeding ed itself. 1366 */ 1367 void 1368 do_ed_script(void) 1369 { 1370 char *t; 1371 long beginning_of_this_line; 1372 FILE *pipefp; 1373 1374 pipefp = NULL; 1375 if (!skip_rest_of_patch) { 1376 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1377 unlink(TMPOUTNAME); 1378 fatal("can't create temp file %s", TMPOUTNAME); 1379 } 1380 snprintf(buf, buf_len, "%s%s%s", _PATH_ED, 1381 verbose ? " " : " -s ", TMPOUTNAME); 1382 pipefp = popen(buf, "w"); 1383 } 1384 for (;;) { 1385 beginning_of_this_line = ftell(pfp); 1386 if (pgets(buf, buf_len, pfp) == NULL) { 1387 next_intuit_at(beginning_of_this_line, p_input_line); 1388 break; 1389 } 1390 p_input_line++; 1391 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1392 ; 1393 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1394 if (isdigit((unsigned char)*buf) && (*t == 'a' || *t == 'c' || 1395 *t == 'd' || *t == 'i' || *t == 's')) { 1396 if (pipefp != NULL) 1397 fputs(buf, pipefp); 1398 if (*t != 'd') { 1399 while (pgets(buf, buf_len, pfp) != NULL) { 1400 p_input_line++; 1401 if (pipefp != NULL) 1402 fputs(buf, pipefp); 1403 if (strEQ(buf, ".\n")) 1404 break; 1405 } 1406 } 1407 } else { 1408 next_intuit_at(beginning_of_this_line, p_input_line); 1409 break; 1410 } 1411 } 1412 if (pipefp == NULL) 1413 return; 1414 fprintf(pipefp, "w\n"); 1415 fprintf(pipefp, "q\n"); 1416 fflush(pipefp); 1417 pclose(pipefp); 1418 ignore_signals(); 1419 if (!check_only) { 1420 if (move_file(TMPOUTNAME, outname) < 0) { 1421 toutkeep = true; 1422 chmod(TMPOUTNAME, filemode); 1423 } else 1424 chmod(outname, filemode); 1425 } 1426 set_signals(1); 1427 } 1428 1429 /* 1430 * Choose the name of the file to be patched based on POSIX rules. 1431 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1432 * if the user specified --posix or set POSIXLY_CORRECT. 1433 */ 1434 static char * 1435 posix_name(const struct file_name *names, bool assume_exists) 1436 { 1437 char *path = NULL; 1438 int i; 1439 1440 /* 1441 * POSIX states that the filename will be chosen from one 1442 * of the old, new and index names (in that order) if 1443 * the file exists relative to CWD after -p stripping. 1444 */ 1445 for (i = 0; i < MAX_FILE; i++) { 1446 if (names[i].path != NULL && names[i].exists) { 1447 path = names[i].path; 1448 break; 1449 } 1450 } 1451 if (path == NULL && !assume_exists) { 1452 /* 1453 * No files found, look for something we can checkout from 1454 * RCS/SCCS dirs. Same order as above. 1455 */ 1456 for (i = 0; i < MAX_FILE; i++) { 1457 if (names[i].path != NULL && 1458 (path = checked_in(names[i].path)) != NULL) 1459 break; 1460 } 1461 /* 1462 * Still no match? Check to see if the diff could be creating 1463 * a new file. 1464 */ 1465 if (path == NULL && ok_to_create_file && 1466 names[NEW_FILE].path != NULL) 1467 path = names[NEW_FILE].path; 1468 } 1469 1470 return path ? savestr(path) : NULL; 1471 } 1472 1473 /* 1474 * Choose the name of the file to be patched based the "best" one 1475 * available. 1476 */ 1477 static char * 1478 best_name(const struct file_name *names, bool assume_exists) 1479 { 1480 size_t min_components, min_baselen, min_len, tmp; 1481 char *best = NULL; 1482 int i; 1483 1484 /* 1485 * The "best" name is the one with the fewest number of path 1486 * components, the shortest basename length, and the shortest 1487 * overall length (in that order). We only use the Index: file 1488 * if neither of the old or new files could be intuited from 1489 * the diff header. 1490 */ 1491 min_components = min_baselen = min_len = SIZE_MAX; 1492 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1493 if (names[i].path == NULL || 1494 (!names[i].exists && !assume_exists)) 1495 continue; 1496 if ((tmp = num_components(names[i].path)) > min_components) 1497 continue; 1498 min_components = tmp; 1499 if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1500 continue; 1501 min_baselen = tmp; 1502 if ((tmp = strlen(names[i].path)) > min_len) 1503 continue; 1504 min_len = tmp; 1505 best = names[i].path; 1506 } 1507 if (best == NULL) { 1508 /* 1509 * No files found, look for something we can checkout from 1510 * RCS/SCCS dirs. Logic is identical to that above... 1511 */ 1512 min_components = min_baselen = min_len = SIZE_MAX; 1513 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1514 if (names[i].path == NULL || 1515 checked_in(names[i].path) == NULL) 1516 continue; 1517 if ((tmp = num_components(names[i].path)) > min_components) 1518 continue; 1519 min_components = tmp; 1520 if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1521 continue; 1522 min_baselen = tmp; 1523 if ((tmp = strlen(names[i].path)) > min_len) 1524 continue; 1525 min_len = tmp; 1526 best = names[i].path; 1527 } 1528 /* 1529 * Still no match? Check to see if the diff could be creating 1530 * a new file. 1531 */ 1532 if (best == NULL && ok_to_create_file && 1533 names[NEW_FILE].path != NULL) 1534 best = names[NEW_FILE].path; 1535 } 1536 1537 return best ? savestr(best) : NULL; 1538 } 1539 1540 static size_t 1541 num_components(const char *path) 1542 { 1543 size_t n; 1544 const char *cp; 1545 1546 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1547 while (*cp == '/') 1548 cp++; /* skip consecutive slashes */ 1549 } 1550 return n; 1551 } 1552