1 /* 2 * $OpenBSD: pch.c,v 1.37 2007/09/02 15:19:33 deraadt Exp $ 3 * $DragonFly: src/usr.bin/patch/pch.c,v 1.6 2008/08/10 23:35:40 joerg Exp $ 4 * $NetBSD: pch.c,v 1.23 2008/09/19 18:33:34 joerg Exp $ 5 */ 6 7 /* 8 * patch - a program to apply diffs to original files 9 * 10 * Copyright 1986, Larry Wall 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following condition is met: 14 * 1. Redistributions of source code must retain the above copyright notice, 15 * this condition and the following disclaimer. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 30 * behaviour 31 */ 32 33 #include <sys/cdefs.h> 34 __RCSID("$NetBSD: pch.c,v 1.23 2008/09/19 18:33:34 joerg Exp $"); 35 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 39 #include <ctype.h> 40 #include <libgen.h> 41 #include <limits.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #include "common.h" 48 #include "util.h" 49 #include "pch.h" 50 #include "pathnames.h" 51 52 /* Patch (diff listing) abstract type. */ 53 54 static long p_filesize; /* size of the patch file */ 55 static LINENUM p_first; /* 1st line number */ 56 static LINENUM p_newfirst; /* 1st line number of replacement */ 57 static LINENUM p_ptrn_lines; /* # lines in pattern */ 58 static LINENUM p_repl_lines; /* # lines in replacement text */ 59 static LINENUM p_end = -1; /* last line in hunk */ 60 static LINENUM p_max; /* max allowed value of p_end */ 61 static LINENUM p_context = 3; /* # of context lines */ 62 static LINENUM p_input_line = 0; /* current line # from patch file */ 63 static char **p_line = NULL;/* the text of the hunk */ 64 static short *p_len = NULL; /* length of each line */ 65 static char *p_char = NULL; /* +, -, and ! */ 66 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 67 static int p_indent; /* indent to patch */ 68 static LINENUM p_base; /* where to intuit this time */ 69 static LINENUM p_bline; /* line # of p_base */ 70 static LINENUM p_start; /* where intuit found a patch */ 71 static LINENUM p_sline; /* and the line number for it */ 72 static LINENUM p_hunk_beg; /* line number of current hunk */ 73 static LINENUM p_efake = -1; /* end of faked up lines--don't free */ 74 static LINENUM p_bfake = -1; /* beg of faked up lines */ 75 static FILE *pfp = NULL; /* patch file pointer */ 76 static char *bestguess = NULL; /* guess at correct filename */ 77 78 static void grow_hunkmax(void); 79 static int intuit_diff_type(void); 80 static void next_intuit_at(LINENUM, LINENUM); 81 static void skip_to(LINENUM, LINENUM); 82 static char *pgets(char *, int, FILE *); 83 static char *best_name(const struct file_name *, bool); 84 static char *posix_name(const struct file_name *, bool); 85 static size_t num_components(const char *); 86 87 /* 88 * Prepare to look for the next patch in the patch file. 89 */ 90 void 91 re_patch(void) 92 { 93 p_first = 0; 94 p_newfirst = 0; 95 p_ptrn_lines = 0; 96 p_repl_lines = 0; 97 p_end = (LINENUM) - 1; 98 p_max = 0; 99 p_indent = 0; 100 } 101 102 /* 103 * Open the patch file at the beginning of time. 104 */ 105 void 106 open_patch_file(const char *filename) 107 { 108 struct stat filestat; 109 110 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 111 pfp = fopen(TMPPATNAME, "w"); 112 if (pfp == NULL) 113 pfatal("can't create %s", TMPPATNAME); 114 while (fgets(buf, buf_len, stdin) != NULL) 115 fputs(buf, pfp); 116 if (ferror(pfp) || fclose(pfp)) 117 pfatal("can't write %s", TMPPATNAME); 118 filename = TMPPATNAME; 119 } 120 pfp = fopen(filename, "r"); 121 if (pfp == NULL) 122 pfatal("patch file %s not found", filename); 123 fstat(fileno(pfp), &filestat); 124 p_filesize = filestat.st_size; 125 next_intuit_at(0L, 1L); /* start at the beginning */ 126 set_hunkmax(); 127 } 128 129 /* 130 * Make sure our dynamically realloced tables are malloced to begin with. 131 */ 132 void 133 set_hunkmax(void) 134 { 135 if (p_line == NULL) 136 p_line = calloc((size_t) hunkmax, sizeof(char *)); 137 if (p_len == NULL) 138 p_len = calloc((size_t) hunkmax, sizeof(short)); 139 if (p_char == NULL) 140 p_char = calloc((size_t) hunkmax, sizeof(char)); 141 } 142 143 /* 144 * Enlarge the arrays containing the current hunk of patch. 145 */ 146 static void 147 grow_hunkmax(void) 148 { 149 int new_hunkmax; 150 char **new_p_line; 151 short *new_p_len; 152 char *new_p_char; 153 154 new_hunkmax = hunkmax * 2; 155 156 if (p_line == NULL || p_len == NULL || p_char == NULL) 157 fatal("Internal memory allocation error\n"); 158 159 new_p_line = realloc(p_line, new_hunkmax * sizeof(char *)); 160 if (new_p_line == NULL) 161 free(p_line); 162 163 new_p_len = realloc(p_len, new_hunkmax * sizeof(short)); 164 if (new_p_len == NULL) 165 free(p_len); 166 167 new_p_char = realloc(p_char, new_hunkmax * sizeof(char)); 168 if (new_p_char == NULL) 169 free(p_char); 170 171 p_char = new_p_char; 172 p_len = new_p_len; 173 p_line = new_p_line; 174 175 if (p_line != NULL && p_len != NULL && p_char != NULL) { 176 hunkmax = new_hunkmax; 177 return; 178 } 179 180 if (!using_plan_a) 181 fatal("out of memory\n"); 182 out_of_mem = true; /* whatever is null will be allocated again */ 183 /* from within plan_a(), of all places */ 184 } 185 186 /* True if the remainder of the patch file contains a diff of some sort. */ 187 188 bool 189 there_is_another_patch(void) 190 { 191 bool exists = false; 192 193 if (p_base != 0L && p_base >= p_filesize) { 194 if (verbose) 195 say("done\n"); 196 return false; 197 } 198 if (verbose) 199 say("Hmm..."); 200 diff_type = intuit_diff_type(); 201 if (!diff_type) { 202 if (p_base != 0L) { 203 if (verbose) 204 say(" Ignoring the trailing garbage.\ndone\n"); 205 } else 206 say(" I can't seem to find a patch in there anywhere.\n"); 207 return false; 208 } 209 if (verbose) 210 say(" %sooks like %s to me...\n", 211 (p_base == 0L ? "L" : "The next patch l"), 212 diff_type == UNI_DIFF ? "a unified diff" : 213 diff_type == CONTEXT_DIFF ? "a context diff" : 214 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 215 diff_type == NORMAL_DIFF ? "a normal diff" : 216 "an ed script"); 217 if (p_indent && verbose) 218 say("(Patch is indented %d space%s.)\n", p_indent, 219 p_indent == 1 ? "" : "s"); 220 skip_to(p_start, p_sline); 221 while (filearg[0] == NULL) { 222 if (force || batch) { 223 say("No file to patch. Skipping...\n"); 224 filearg[0] = savestr(bestguess); 225 skip_rest_of_patch = true; 226 return true; 227 } 228 ask("File to patch: "); 229 if (*buf != '\n') { 230 free(bestguess); 231 bestguess = savestr(buf); 232 filearg[0] = fetchname(buf, &exists, 0); 233 } 234 if (!exists) { 235 ask("No file found--skip this patch? [n] "); 236 if (*buf != 'y') 237 continue; 238 if (verbose) 239 say("Skipping patch...\n"); 240 free(filearg[0]); 241 filearg[0] = fetchname(bestguess, &exists, 0); 242 skip_rest_of_patch = true; 243 return true; 244 } 245 } 246 return true; 247 } 248 249 /* Determine what kind of diff is in the remaining part of the patch file. */ 250 251 static int 252 intuit_diff_type(void) 253 { 254 long this_line = 0, previous_line; 255 long first_command_line = -1; 256 LINENUM fcl_line = -1; 257 bool last_line_was_command = false, this_is_a_command = false; 258 bool stars_last_line = false, stars_this_line = false; 259 char *s, *t; 260 int indent, retval; 261 struct file_name names[MAX_FILE]; 262 263 memset(names, 0, sizeof(names)); 264 ok_to_create_file = false; 265 fseek(pfp, p_base, SEEK_SET); 266 p_input_line = p_bline - 1; 267 for (;;) { 268 previous_line = this_line; 269 last_line_was_command = this_is_a_command; 270 stars_last_line = stars_this_line; 271 this_line = ftell(pfp); 272 indent = 0; 273 p_input_line++; 274 if (fgets(buf, buf_len, pfp) == NULL) { 275 if (first_command_line >= 0L) { 276 /* nothing but deletes!? */ 277 p_start = first_command_line; 278 p_sline = fcl_line; 279 retval = ED_DIFF; 280 goto scan_exit; 281 } else { 282 p_start = this_line; 283 p_sline = p_input_line; 284 retval = 0; 285 goto scan_exit; 286 } 287 } 288 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 289 if (*s == '\t') 290 indent += 8 - (indent % 8); 291 else 292 indent++; 293 } 294 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 295 ; 296 this_is_a_command = (isdigit((unsigned char)*s) && 297 (*t == 'd' || *t == 'c' || *t == 'a')); 298 if (first_command_line < 0L && this_is_a_command) { 299 first_command_line = this_line; 300 fcl_line = p_input_line; 301 p_indent = indent; /* assume this for now */ 302 } 303 if (!stars_last_line && strnEQ(s, "*** ", 4)) 304 names[OLD_FILE].path = fetchname(s + 4, 305 &names[OLD_FILE].exists, strippath); 306 else if (strnEQ(s, "--- ", 4)) 307 names[NEW_FILE].path = fetchname(s + 4, 308 &names[NEW_FILE].exists, strippath); 309 else if (strnEQ(s, "+++ ", 4)) 310 /* pretend it is the old name */ 311 names[OLD_FILE].path = fetchname(s + 4, 312 &names[OLD_FILE].exists, strippath); 313 else if (strnEQ(s, "Index:", 6)) 314 names[INDEX_FILE].path = fetchname(s + 6, 315 &names[INDEX_FILE].exists, strippath); 316 else if (strnEQ(s, "Prereq:", 7)) { 317 for (t = s + 7; isspace((unsigned char)*t); t++) 318 ; 319 revision = savestr(t); 320 for (t = revision; *t && !isspace((unsigned char)*t); t++) 321 ; 322 *t = '\0'; 323 if (*revision == '\0') { 324 free(revision); 325 revision = NULL; 326 } 327 } 328 if ((!diff_type || diff_type == ED_DIFF) && 329 first_command_line >= 0L && 330 strEQ(s, ".\n")) { 331 p_indent = indent; 332 p_start = first_command_line; 333 p_sline = fcl_line; 334 retval = ED_DIFF; 335 goto scan_exit; 336 } 337 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 338 if (strnEQ(s + 4, "0,0", 3)) 339 ok_to_create_file = true; 340 p_indent = indent; 341 p_start = this_line; 342 p_sline = p_input_line; 343 retval = UNI_DIFF; 344 goto scan_exit; 345 } 346 stars_this_line = strnEQ(s, "********", 8); 347 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 348 strnEQ(s, "*** ", 4)) { 349 if (atol(s + 4) == 0) 350 ok_to_create_file = true; 351 /* 352 * If this is a new context diff the character just 353 * before the newline is a '*'. 354 */ 355 while (*s != '\n') 356 s++; 357 p_indent = indent; 358 p_start = previous_line; 359 p_sline = p_input_line - 1; 360 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 361 goto scan_exit; 362 } 363 if ((!diff_type || diff_type == NORMAL_DIFF) && 364 last_line_was_command && 365 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 366 p_start = previous_line; 367 p_sline = p_input_line - 1; 368 p_indent = indent; 369 retval = NORMAL_DIFF; 370 goto scan_exit; 371 } 372 } 373 scan_exit: 374 if (retval == UNI_DIFF) { 375 /* unswap old and new */ 376 struct file_name tmp = names[OLD_FILE]; 377 names[OLD_FILE] = names[NEW_FILE]; 378 names[NEW_FILE] = tmp; 379 } 380 if (filearg[0] == NULL) { 381 if (posix) 382 filearg[0] = posix_name(names, ok_to_create_file); 383 else { 384 /* Ignore the Index: name for context diffs, like GNU */ 385 if (names[OLD_FILE].path != NULL || 386 names[NEW_FILE].path != NULL) { 387 free(names[INDEX_FILE].path); 388 names[INDEX_FILE].path = NULL; 389 } 390 filearg[0] = best_name(names, ok_to_create_file); 391 } 392 } 393 394 free(bestguess); 395 bestguess = NULL; 396 if (filearg[0] != NULL) 397 bestguess = savestr(filearg[0]); 398 else if (!ok_to_create_file) { 399 /* 400 * We don't want to create a new file but we need a 401 * filename to set bestguess. Avoid setting filearg[0] 402 * so the file is not created automatically. 403 */ 404 if (posix) 405 bestguess = posix_name(names, true); 406 else 407 bestguess = best_name(names, true); 408 } 409 free(names[OLD_FILE].path); 410 free(names[NEW_FILE].path); 411 free(names[INDEX_FILE].path); 412 return retval; 413 } 414 415 /* 416 * Remember where this patch ends so we know where to start up again. 417 */ 418 static void 419 next_intuit_at(LINENUM file_pos, LINENUM file_line) 420 { 421 p_base = file_pos; 422 p_bline = file_line; 423 } 424 425 /* 426 * Basically a verbose fseek() to the actual diff listing. 427 */ 428 static void 429 skip_to(LINENUM file_pos, LINENUM file_line) 430 { 431 char *ret; 432 433 if (p_base > file_pos) 434 fatal("Internal error: seek %ld>%ld\n", p_base, file_pos); 435 if (verbose && p_base < file_pos) { 436 fseek(pfp, p_base, SEEK_SET); 437 say("The text leading up to this was:\n--------------------------\n"); 438 while (ftell(pfp) < file_pos) { 439 ret = fgets(buf, buf_len, pfp); 440 if (ret == NULL) 441 fatal("Unexpected end of file\n"); 442 say("|%s", buf); 443 } 444 say("--------------------------\n"); 445 } else 446 fseek(pfp, file_pos, SEEK_SET); 447 p_input_line = file_line - 1; 448 } 449 450 /* Make this a function for better debugging. */ 451 static void 452 malformed(void) 453 { 454 fatal("malformed patch at line %ld: %s", p_input_line, buf); 455 /* about as informative as "Syntax error" in C */ 456 } 457 458 /* 459 * True if the line has been discarded (i.e. it is a line saying 460 * "\ No newline at end of file".) 461 */ 462 static bool 463 remove_special_line(void) 464 { 465 int c; 466 467 c = fgetc(pfp); 468 if (c == '\\') { 469 do { 470 c = fgetc(pfp); 471 } while (c != EOF && c != '\n'); 472 473 return true; 474 } 475 if (c != EOF) 476 fseek(pfp, -1L, SEEK_CUR); 477 478 return false; 479 } 480 481 /* 482 * True if there is more of the current diff listing to process. 483 */ 484 bool 485 another_hunk(void) 486 { 487 long line_beginning; /* file pos of the current line */ 488 LINENUM repl_beginning; /* index of --- line */ 489 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 490 LINENUM fillsrc; /* index of first line to copy */ 491 LINENUM filldst; /* index of first missing line */ 492 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 493 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 494 bool repl_missing; /* we are now backtracking */ 495 long repl_backtrack_position; /* file pos of first repl line */ 496 LINENUM repl_patch_line; /* input line number for same */ 497 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 498 char *s, *ret; 499 int context = 0; 500 501 while (p_end >= 0) { 502 if (p_end == p_efake) 503 p_end = p_bfake; /* don't free twice */ 504 else 505 free(p_line[p_end]); 506 p_end--; 507 } 508 p_efake = -1; 509 510 p_max = hunkmax; /* gets reduced when --- found */ 511 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 512 line_beginning = ftell(pfp); 513 repl_beginning = 0; 514 fillcnt = 0; 515 fillsrc = 0; 516 filldst = 0; 517 ptrn_spaces_eaten = false; 518 repl_could_be_missing = true; 519 repl_missing = false; 520 repl_backtrack_position = 0; 521 repl_patch_line = 0; 522 ptrn_copiable = 0; 523 524 ret = pgets(buf, buf_len, pfp); 525 p_input_line++; 526 if (ret == NULL || strnNE(buf, "********", 8)) { 527 next_intuit_at(line_beginning, p_input_line); 528 return false; 529 } 530 p_context = 100; 531 p_hunk_beg = p_input_line + 1; 532 while (p_end < p_max) { 533 line_beginning = ftell(pfp); 534 ret = pgets(buf, buf_len, pfp); 535 p_input_line++; 536 if (ret == NULL) { 537 if (p_max - p_end < 4) { 538 /* assume blank lines got chopped */ 539 strlcpy(buf, " \n", buf_len); 540 } else { 541 if (repl_beginning && repl_could_be_missing) { 542 repl_missing = true; 543 goto hunk_done; 544 } 545 fatal("unexpected end of file in patch\n"); 546 } 547 } 548 p_end++; 549 if (p_end >= hunkmax) 550 fatal("Internal error: hunk larger than hunk " 551 "buffer size"); 552 p_char[p_end] = *buf; 553 p_line[p_end] = NULL; 554 switch (*buf) { 555 case '*': 556 if (strnEQ(buf, "********", 8)) { 557 if (repl_beginning && repl_could_be_missing) { 558 repl_missing = true; 559 goto hunk_done; 560 } else 561 fatal("unexpected end of hunk " 562 "at line %ld\n", 563 p_input_line); 564 } 565 if (p_end != 0) { 566 if (repl_beginning && repl_could_be_missing) { 567 repl_missing = true; 568 goto hunk_done; 569 } 570 fatal("unexpected *** at line %ld: %s", 571 p_input_line, buf); 572 } 573 context = 0; 574 p_line[p_end] = savestr(buf); 575 if (out_of_mem) { 576 p_end--; 577 return false; 578 } 579 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 580 ; 581 if (!*s) 582 malformed(); 583 if (strnEQ(s, "0,0", 3)) 584 memmove(s, s + 2, strlen(s + 2) + 1); 585 p_first = (LINENUM) atol(s); 586 while (isdigit((unsigned char)*s)) 587 s++; 588 if (*s == ',') { 589 for (; *s && !isdigit((unsigned char)*s); s++) 590 ; 591 if (!*s) 592 malformed(); 593 p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1; 594 } else if (p_first) 595 p_ptrn_lines = 1; 596 else { 597 p_ptrn_lines = 0; 598 p_first = 1; 599 } 600 601 /* we need this much at least */ 602 p_max = p_ptrn_lines + 6; 603 while (p_max >= hunkmax) 604 grow_hunkmax(); 605 p_max = hunkmax; 606 break; 607 case '-': 608 if (buf[1] == '-') { 609 if (repl_beginning || 610 (p_end != p_ptrn_lines + 1 + 611 (p_char[p_end - 1] == '\n'))) { 612 if (p_end == 1) { 613 /* 614 * `old' lines were omitted; 615 * set up to fill them in 616 * from 'new' context lines. 617 */ 618 p_end = p_ptrn_lines + 1; 619 fillsrc = p_end + 1; 620 filldst = 1; 621 fillcnt = p_ptrn_lines; 622 } else { 623 if (repl_beginning) { 624 if (repl_could_be_missing) { 625 repl_missing = true; 626 goto hunk_done; 627 } 628 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 629 p_input_line, p_hunk_beg + repl_beginning); 630 } else { 631 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 632 (p_end <= p_ptrn_lines 633 ? "Premature" 634 : "Overdue"), 635 p_input_line, p_hunk_beg); 636 } 637 } 638 } 639 repl_beginning = p_end; 640 repl_backtrack_position = ftell(pfp); 641 repl_patch_line = p_input_line; 642 p_line[p_end] = savestr(buf); 643 if (out_of_mem) { 644 p_end--; 645 return false; 646 } 647 p_char[p_end] = '='; 648 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 649 ; 650 if (!*s) 651 malformed(); 652 p_newfirst = (LINENUM) atol(s); 653 while (isdigit((unsigned char)*s)) 654 s++; 655 if (*s == ',') { 656 for (; *s && !isdigit((unsigned char)*s); s++) 657 ; 658 if (!*s) 659 malformed(); 660 p_repl_lines = ((LINENUM) atol(s)) - 661 p_newfirst + 1; 662 } else if (p_newfirst) 663 p_repl_lines = 1; 664 else { 665 p_repl_lines = 0; 666 p_newfirst = 1; 667 } 668 p_max = p_repl_lines + p_end; 669 if (p_max > MAXHUNKSIZE) 670 fatal("hunk too large (%ld lines) at line %ld: %s", 671 p_max, p_input_line, buf); 672 while (p_max >= hunkmax) 673 grow_hunkmax(); 674 if (p_repl_lines != ptrn_copiable && 675 (p_context != 0 || p_repl_lines != 1)) 676 repl_could_be_missing = false; 677 break; 678 } 679 goto change_line; 680 case '+': 681 case '!': 682 repl_could_be_missing = false; 683 change_line: 684 if (buf[1] == '\n' && canonicalize) 685 strlcpy(buf + 1, " \n", buf_len - 1); 686 if (!isspace((unsigned char)buf[1]) && buf[1] != '>' && 687 buf[1] != '<' && 688 repl_beginning && repl_could_be_missing) { 689 repl_missing = true; 690 goto hunk_done; 691 } 692 if (context >= 0) { 693 if (context < p_context) 694 p_context = context; 695 context = -1000; 696 } 697 p_line[p_end] = savestr(buf + 2); 698 if (out_of_mem) { 699 p_end--; 700 return false; 701 } 702 if (p_end == p_ptrn_lines) { 703 if (remove_special_line()) { 704 int len; 705 706 len = strlen(p_line[p_end]) - 1; 707 (p_line[p_end])[len] = 0; 708 } 709 } 710 break; 711 case '\t': 712 case '\n': /* assume the 2 spaces got eaten */ 713 if (repl_beginning && repl_could_be_missing && 714 (!ptrn_spaces_eaten || 715 diff_type == NEW_CONTEXT_DIFF)) { 716 repl_missing = true; 717 goto hunk_done; 718 } 719 p_line[p_end] = savestr(buf); 720 if (out_of_mem) { 721 p_end--; 722 return false; 723 } 724 if (p_end != p_ptrn_lines + 1) { 725 ptrn_spaces_eaten |= (repl_beginning != 0); 726 context++; 727 if (!repl_beginning) 728 ptrn_copiable++; 729 p_char[p_end] = ' '; 730 } 731 break; 732 case ' ': 733 if (!isspace((unsigned char)buf[1]) && 734 repl_beginning && repl_could_be_missing) { 735 repl_missing = true; 736 goto hunk_done; 737 } 738 context++; 739 if (!repl_beginning) 740 ptrn_copiable++; 741 p_line[p_end] = savestr(buf + 2); 742 if (out_of_mem) { 743 p_end--; 744 return false; 745 } 746 break; 747 default: 748 if (repl_beginning && repl_could_be_missing) { 749 repl_missing = true; 750 goto hunk_done; 751 } 752 malformed(); 753 } 754 /* set up p_len for strncmp() so we don't have to */ 755 /* assume null termination */ 756 if (p_line[p_end]) 757 p_len[p_end] = strlen(p_line[p_end]); 758 else 759 p_len[p_end] = 0; 760 } 761 762 hunk_done: 763 if (p_end >= 0 && !repl_beginning) 764 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 765 766 if (repl_missing) { 767 768 /* reset state back to just after --- */ 769 p_input_line = repl_patch_line; 770 for (p_end--; p_end > repl_beginning; p_end--) 771 free(p_line[p_end]); 772 fseek(pfp, repl_backtrack_position, SEEK_SET); 773 774 /* redundant 'new' context lines were omitted - set */ 775 /* up to fill them in from the old file context */ 776 if (!p_context && p_repl_lines == 1) { 777 p_repl_lines = 0; 778 p_max--; 779 } 780 fillsrc = 1; 781 filldst = repl_beginning + 1; 782 fillcnt = p_repl_lines; 783 p_end = p_max; 784 } else if (!p_context && fillcnt == 1) { 785 /* the first hunk was a null hunk with no context */ 786 /* and we were expecting one line -- fix it up. */ 787 while (filldst < p_end) { 788 p_line[filldst] = p_line[filldst + 1]; 789 p_char[filldst] = p_char[filldst + 1]; 790 p_len[filldst] = p_len[filldst + 1]; 791 filldst++; 792 } 793 #if 0 794 repl_beginning--; /* this doesn't need to be fixed */ 795 #endif 796 p_end--; 797 p_first++; /* do append rather than insert */ 798 fillcnt = 0; 799 p_ptrn_lines = 0; 800 } 801 if (diff_type == CONTEXT_DIFF && 802 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 803 if (verbose) 804 say("%s\n%s\n%s\n", 805 "(Fascinating--this is really a new-style context diff but without", 806 "the telltale extra asterisks on the *** line that usually indicate", 807 "the new style...)"); 808 diff_type = NEW_CONTEXT_DIFF; 809 } 810 /* if there were omitted context lines, fill them in now */ 811 if (fillcnt) { 812 p_bfake = filldst; /* remember where not to free() */ 813 p_efake = filldst + fillcnt - 1; 814 while (fillcnt-- > 0) { 815 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 816 fillsrc++; 817 if (fillsrc > p_end) 818 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 819 p_hunk_beg); 820 p_line[filldst] = p_line[fillsrc]; 821 p_char[filldst] = p_char[fillsrc]; 822 p_len[filldst] = p_len[fillsrc]; 823 fillsrc++; 824 filldst++; 825 } 826 while (fillsrc <= p_end && fillsrc != repl_beginning && 827 p_char[fillsrc] != ' ') 828 fillsrc++; 829 #ifdef DEBUGGING 830 if (debug & 64) 831 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 832 fillsrc, filldst, repl_beginning, p_end + 1); 833 #endif 834 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 835 malformed(); 836 if (filldst != p_end + 1 && filldst != repl_beginning) 837 malformed(); 838 } 839 if (p_line[p_end] != NULL) { 840 if (remove_special_line()) { 841 p_len[p_end] -= 1; 842 (p_line[p_end])[p_len[p_end]] = 0; 843 } 844 } 845 } else if (diff_type == UNI_DIFF) { 846 LINENUM fillold; /* index of old lines */ 847 LINENUM fillnew; /* index of new lines */ 848 char ch; 849 850 line_beginning = ftell(pfp); /* file pos of the current line */ 851 ret = pgets(buf, buf_len, pfp); 852 p_input_line++; 853 if (ret == NULL || strnNE(buf, "@@ -", 4)) { 854 next_intuit_at(line_beginning, p_input_line); 855 return false; 856 } 857 s = buf + 4; 858 if (!*s) 859 malformed(); 860 p_first = (LINENUM) atol(s); 861 while (isdigit((unsigned char)*s)) 862 s++; 863 if (*s == ',') { 864 p_ptrn_lines = (LINENUM) atol(++s); 865 while (isdigit((unsigned char)*s)) 866 s++; 867 } else 868 p_ptrn_lines = 1; 869 if (*s == ' ') 870 s++; 871 if (*s != '+' || !*++s) 872 malformed(); 873 p_newfirst = (LINENUM) atol(s); 874 while (isdigit((unsigned char)*s)) 875 s++; 876 if (*s == ',') { 877 p_repl_lines = (LINENUM) atol(++s); 878 while (isdigit((unsigned char)*s)) 879 s++; 880 } else 881 p_repl_lines = 1; 882 if (*s == ' ') 883 s++; 884 if (*s != '@') 885 malformed(); 886 if (!p_ptrn_lines) 887 p_first++; /* do append rather than insert */ 888 p_max = p_ptrn_lines + p_repl_lines + 1; 889 while (p_max >= hunkmax) 890 grow_hunkmax(); 891 fillold = 1; 892 fillnew = fillold + p_ptrn_lines; 893 p_end = fillnew + p_repl_lines; 894 snprintf(buf, buf_len, "*** %ld,%ld ****\n", p_first, 895 p_first + p_ptrn_lines - 1); 896 p_line[0] = savestr(buf); 897 if (out_of_mem) { 898 p_end = -1; 899 return false; 900 } 901 p_char[0] = '*'; 902 snprintf(buf, buf_len, "--- %ld,%ld ----\n", p_newfirst, 903 p_newfirst + p_repl_lines - 1); 904 p_line[fillnew] = savestr(buf); 905 if (out_of_mem) { 906 p_end = 0; 907 return false; 908 } 909 p_char[fillnew++] = '='; 910 p_context = 100; 911 context = 0; 912 p_hunk_beg = p_input_line + 1; 913 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 914 line_beginning = ftell(pfp); 915 ret = pgets(buf, buf_len, pfp); 916 p_input_line++; 917 if (ret == NULL) { 918 if (p_max - fillnew < 3) { 919 /* assume blank lines got chopped */ 920 strlcpy(buf, " \n", buf_len); 921 } else { 922 fatal("unexpected end of file in patch\n"); 923 } 924 } 925 if (*buf == '\t' || *buf == '\n') { 926 ch = ' '; /* assume the space got eaten */ 927 s = savestr(buf); 928 } else { 929 ch = *buf; 930 s = savestr(buf + 1); 931 } 932 if (out_of_mem) { 933 while (--fillnew > p_ptrn_lines) 934 free(p_line[fillnew]); 935 p_end = fillold - 1; 936 return false; 937 } 938 switch (ch) { 939 case '-': 940 if (fillold > p_ptrn_lines) { 941 free(s); 942 p_end = fillnew - 1; 943 malformed(); 944 } 945 p_char[fillold] = ch; 946 p_line[fillold] = s; 947 p_len[fillold++] = strlen(s); 948 if (fillold > p_ptrn_lines) { 949 if (remove_special_line()) { 950 p_len[fillold - 1] -= 1; 951 s[p_len[fillold - 1]] = 0; 952 } 953 } 954 break; 955 case '=': 956 ch = ' '; 957 /* FALL THROUGH */ 958 case ' ': 959 if (fillold > p_ptrn_lines) { 960 free(s); 961 while (--fillnew > p_ptrn_lines) 962 free(p_line[fillnew]); 963 p_end = fillold - 1; 964 malformed(); 965 } 966 context++; 967 p_char[fillold] = ch; 968 p_line[fillold] = s; 969 p_len[fillold++] = strlen(s); 970 s = savestr(s); 971 if (out_of_mem) { 972 while (--fillnew > p_ptrn_lines) 973 free(p_line[fillnew]); 974 p_end = fillold - 1; 975 return false; 976 } 977 if (fillold > p_ptrn_lines) { 978 if (remove_special_line()) { 979 p_len[fillold - 1] -= 1; 980 s[p_len[fillold - 1]] = 0; 981 } 982 } 983 /* FALL THROUGH */ 984 case '+': 985 if (fillnew > p_end) { 986 free(s); 987 while (--fillnew > p_ptrn_lines) 988 free(p_line[fillnew]); 989 p_end = fillold - 1; 990 malformed(); 991 } 992 p_char[fillnew] = ch; 993 p_line[fillnew] = s; 994 p_len[fillnew++] = strlen(s); 995 if (fillold > p_ptrn_lines) { 996 if (remove_special_line()) { 997 p_len[fillnew - 1] -= 1; 998 s[p_len[fillnew - 1]] = 0; 999 } 1000 } 1001 break; 1002 default: 1003 p_end = fillnew; 1004 malformed(); 1005 } 1006 if (ch != ' ' && context > 0) { 1007 if (context < p_context) 1008 p_context = context; 1009 context = -1000; 1010 } 1011 } /* while */ 1012 } else { /* normal diff--fake it up */ 1013 char hunk_type; 1014 int i; 1015 LINENUM min, max; 1016 1017 line_beginning = ftell(pfp); 1018 p_context = 0; 1019 ret = pgets(buf, buf_len, pfp); 1020 p_input_line++; 1021 if (ret == NULL || !isdigit((unsigned char)*buf)) { 1022 next_intuit_at(line_beginning, p_input_line); 1023 return false; 1024 } 1025 p_first = (LINENUM) atol(buf); 1026 for (s = buf; isdigit((unsigned char)*s); s++) 1027 ; 1028 if (*s == ',') { 1029 p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1; 1030 while (isdigit((unsigned char)*s)) 1031 s++; 1032 } else 1033 p_ptrn_lines = (*s != 'a'); 1034 hunk_type = *s; 1035 if (hunk_type == 'a') 1036 p_first++; /* do append rather than insert */ 1037 min = (LINENUM) atol(++s); 1038 for (; isdigit((unsigned char)*s); s++) 1039 ; 1040 if (*s == ',') 1041 max = (LINENUM) atol(++s); 1042 else 1043 max = min; 1044 if (hunk_type == 'd') 1045 min++; 1046 p_end = p_ptrn_lines + 1 + max - min + 1; 1047 if (p_end > MAXHUNKSIZE) 1048 fatal("hunk too large (%ld lines) at line %ld: %s", 1049 p_end, p_input_line, buf); 1050 while (p_end >= hunkmax) 1051 grow_hunkmax(); 1052 p_newfirst = min; 1053 p_repl_lines = max - min + 1; 1054 snprintf(buf, buf_len, "*** %ld,%ld\n", p_first, 1055 p_first + p_ptrn_lines - 1); 1056 p_line[0] = savestr(buf); 1057 if (out_of_mem) { 1058 p_end = -1; 1059 return false; 1060 } 1061 p_char[0] = '*'; 1062 for (i = 1; i <= p_ptrn_lines; i++) { 1063 ret = pgets(buf, buf_len, pfp); 1064 p_input_line++; 1065 if (ret == NULL) 1066 fatal("unexpected end of file in patch at line %ld\n", 1067 p_input_line); 1068 if (*buf != '<') 1069 fatal("< expected at line %ld of patch\n", 1070 p_input_line); 1071 p_line[i] = savestr(buf + 2); 1072 if (out_of_mem) { 1073 p_end = i - 1; 1074 return false; 1075 } 1076 p_len[i] = strlen(p_line[i]); 1077 p_char[i] = '-'; 1078 } 1079 1080 if (remove_special_line()) { 1081 p_len[i - 1] -= 1; 1082 (p_line[i - 1])[p_len[i - 1]] = 0; 1083 } 1084 if (hunk_type == 'c') { 1085 ret = pgets(buf, buf_len, pfp); 1086 p_input_line++; 1087 if (ret == NULL) 1088 fatal("unexpected end of file in patch at line %ld\n", 1089 p_input_line); 1090 if (*buf != '-') 1091 fatal("--- expected at line %ld of patch\n", 1092 p_input_line); 1093 } 1094 snprintf(buf, buf_len, "--- %ld,%ld\n", min, max); 1095 p_line[i] = savestr(buf); 1096 if (out_of_mem) { 1097 p_end = i - 1; 1098 return false; 1099 } 1100 p_char[i] = '='; 1101 for (i++; i <= p_end; i++) { 1102 ret = pgets(buf, buf_len, pfp); 1103 p_input_line++; 1104 if (ret == NULL) 1105 fatal("unexpected end of file in patch at line %ld\n", 1106 p_input_line); 1107 if (*buf != '>') 1108 fatal("> expected at line %ld of patch\n", 1109 p_input_line); 1110 p_line[i] = savestr(buf + 2); 1111 if (out_of_mem) { 1112 p_end = i - 1; 1113 return false; 1114 } 1115 p_len[i] = strlen(p_line[i]); 1116 p_char[i] = '+'; 1117 } 1118 1119 if (remove_special_line()) { 1120 p_len[i - 1] -= 1; 1121 (p_line[i - 1])[p_len[i - 1]] = 0; 1122 } 1123 } 1124 if (reverse) /* backwards patch? */ 1125 if (!pch_swap()) 1126 say("Not enough memory to swap next hunk!\n"); 1127 #ifdef DEBUGGING 1128 if (debug & 2) { 1129 int i; 1130 char special; 1131 1132 for (i = 0; i <= p_end; i++) { 1133 if (i == p_ptrn_lines) 1134 special = '^'; 1135 else 1136 special = ' '; 1137 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1138 special, p_line[i]); 1139 fflush(stderr); 1140 } 1141 } 1142 #endif 1143 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1144 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1145 return true; 1146 } 1147 1148 /* 1149 * Input a line from the patch file, worrying about indentation. 1150 */ 1151 static char * 1152 pgets(char *bf, int sz, FILE *fp) 1153 { 1154 char *s, *ret = fgets(bf, sz, fp); 1155 int indent = 0; 1156 1157 if (p_indent && ret != NULL) { 1158 for (s = buf; 1159 indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X'); 1160 s++) { 1161 if (*s == '\t') 1162 indent += 8 - (indent % 7); 1163 else 1164 indent++; 1165 } 1166 if (buf != s && strlcpy(buf, s, buf_len) >= buf_len) 1167 fatal("buffer too small in pgets()\n"); 1168 } 1169 return ret; 1170 } 1171 1172 /* 1173 * Reverse the old and new portions of the current hunk. 1174 */ 1175 bool 1176 pch_swap(void) 1177 { 1178 char **tp_line; /* the text of the hunk */ 1179 short *tp_len; /* length of each line */ 1180 char *tp_char; /* +, -, and ! */ 1181 LINENUM i; 1182 LINENUM n; 1183 bool blankline = false; 1184 char *s; 1185 1186 i = p_first; 1187 p_first = p_newfirst; 1188 p_newfirst = i; 1189 1190 /* make a scratch copy */ 1191 1192 tp_line = p_line; 1193 tp_len = p_len; 1194 tp_char = p_char; 1195 p_line = NULL; /* force set_hunkmax to allocate again */ 1196 p_len = NULL; 1197 p_char = NULL; 1198 set_hunkmax(); 1199 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1200 1201 free(p_line); 1202 p_line = tp_line; 1203 free(p_len); 1204 p_len = tp_len; 1205 free(p_char); 1206 p_char = tp_char; 1207 return false; /* not enough memory to swap hunk! */ 1208 } 1209 /* now turn the new into the old */ 1210 1211 i = p_ptrn_lines + 1; 1212 if (tp_char[i] == '\n') { /* account for possible blank line */ 1213 blankline = true; 1214 i++; 1215 } 1216 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1217 if (p_efake <= i) 1218 n = p_end - i + 1; 1219 else 1220 n = -i; 1221 p_efake += n; 1222 p_bfake += n; 1223 } 1224 for (n = 0; i <= p_end; i++, n++) { 1225 p_line[n] = tp_line[i]; 1226 p_char[n] = tp_char[i]; 1227 if (p_char[n] == '+') 1228 p_char[n] = '-'; 1229 p_len[n] = tp_len[i]; 1230 } 1231 if (blankline) { 1232 i = p_ptrn_lines + 1; 1233 p_line[n] = tp_line[i]; 1234 p_char[n] = tp_char[i]; 1235 p_len[n] = tp_len[i]; 1236 n++; 1237 } 1238 if (p_char[0] != '=') 1239 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1240 p_input_line, p_char[0]); 1241 p_char[0] = '*'; 1242 for (s = p_line[0]; *s; s++) 1243 if (*s == '-') 1244 *s = '*'; 1245 1246 /* now turn the old into the new */ 1247 1248 if (p_char[0] != '*') 1249 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1250 p_input_line, p_char[0]); 1251 tp_char[0] = '='; 1252 for (s = tp_line[0]; *s; s++) 1253 if (*s == '*') 1254 *s = '-'; 1255 for (i = 0; n <= p_end; i++, n++) { 1256 p_line[n] = tp_line[i]; 1257 p_char[n] = tp_char[i]; 1258 if (p_char[n] == '-') 1259 p_char[n] = '+'; 1260 p_len[n] = tp_len[i]; 1261 } 1262 1263 if (i != p_ptrn_lines + 1) 1264 fatal("Malformed patch at line %ld: expected %ld lines, " 1265 "got %ld\n", 1266 p_input_line, p_ptrn_lines + 1, i); 1267 1268 i = p_ptrn_lines; 1269 p_ptrn_lines = p_repl_lines; 1270 p_repl_lines = i; 1271 1272 free(tp_line); 1273 free(tp_len); 1274 free(tp_char); 1275 1276 return true; 1277 } 1278 1279 /* 1280 * Return the specified line position in the old file of the old context. 1281 */ 1282 LINENUM 1283 pch_first(void) 1284 { 1285 return p_first; 1286 } 1287 1288 /* 1289 * Return the number of lines of old context. 1290 */ 1291 LINENUM 1292 pch_ptrn_lines(void) 1293 { 1294 return p_ptrn_lines; 1295 } 1296 1297 /* 1298 * Return the probable line position in the new file of the first line. 1299 */ 1300 LINENUM 1301 pch_newfirst(void) 1302 { 1303 return p_newfirst; 1304 } 1305 1306 /* 1307 * Return the number of lines in the replacement text including context. 1308 */ 1309 LINENUM 1310 pch_repl_lines(void) 1311 { 1312 return p_repl_lines; 1313 } 1314 1315 /* 1316 * Return the number of lines in the whole hunk. 1317 */ 1318 LINENUM 1319 pch_end(void) 1320 { 1321 return p_end; 1322 } 1323 1324 /* 1325 * Return the number of context lines before the first changed line. 1326 */ 1327 LINENUM 1328 pch_context(void) 1329 { 1330 return p_context; 1331 } 1332 1333 /* 1334 * Return the length of a particular patch line. 1335 */ 1336 short 1337 pch_line_len(LINENUM line) 1338 { 1339 return p_len[line]; 1340 } 1341 1342 /* 1343 * Return the control character (+, -, *, !, etc) for a patch line. 1344 */ 1345 char 1346 pch_char(LINENUM line) 1347 { 1348 return p_char[line]; 1349 } 1350 1351 /* 1352 * Return a pointer to a particular patch line. 1353 */ 1354 char * 1355 pfetch(LINENUM line) 1356 { 1357 return p_line[line]; 1358 } 1359 1360 /* 1361 * Return where in the patch file this hunk began, for error messages. 1362 */ 1363 LINENUM 1364 pch_hunk_beg(void) 1365 { 1366 return p_hunk_beg; 1367 } 1368 1369 /* 1370 * Apply an ed script by feeding ed itself. 1371 */ 1372 void 1373 do_ed_script(void) 1374 { 1375 char *t; 1376 long beginning_of_this_line; 1377 FILE *pipefp = NULL; 1378 1379 if (!skip_rest_of_patch) { 1380 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1381 unlink(TMPOUTNAME); 1382 fatal("can't create temp file %s", TMPOUTNAME); 1383 } 1384 snprintf(buf, buf_len, "%s%s%s", _PATH_ED, 1385 verbose ? " " : " -s ", TMPOUTNAME); 1386 pipefp = popen(buf, "w"); 1387 } 1388 for (;;) { 1389 beginning_of_this_line = ftell(pfp); 1390 if (pgets(buf, buf_len, pfp) == NULL) { 1391 next_intuit_at(beginning_of_this_line, p_input_line); 1392 break; 1393 } 1394 p_input_line++; 1395 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1396 ; 1397 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1398 if (isdigit((unsigned char)*buf) && (*t == 'a' || *t == 'c' || 1399 *t == 'd' || *t == 'i' || *t == 's')) { 1400 if (pipefp != NULL) 1401 fputs(buf, pipefp); 1402 if (*t != 'd') { 1403 while (pgets(buf, buf_len, pfp) != NULL) { 1404 p_input_line++; 1405 if (pipefp != NULL) 1406 fputs(buf, pipefp); 1407 if (strEQ(buf, ".\n")) 1408 break; 1409 } 1410 } 1411 } else { 1412 next_intuit_at(beginning_of_this_line, p_input_line); 1413 break; 1414 } 1415 } 1416 if (pipefp == NULL) 1417 return; 1418 fprintf(pipefp, "w\n"); 1419 fprintf(pipefp, "q\n"); 1420 fflush(pipefp); 1421 pclose(pipefp); 1422 ignore_signals(); 1423 if (!check_only) { 1424 if (move_file(TMPOUTNAME, outname) < 0) { 1425 toutkeep = true; 1426 chmod(TMPOUTNAME, filemode); 1427 } else 1428 chmod(outname, filemode); 1429 } 1430 set_signals(1); 1431 } 1432 1433 /* 1434 * Choose the name of the file to be patched based on POSIX rules. 1435 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1436 * if the user specified --posix or set POSIXLY_CORRECT. 1437 */ 1438 static char * 1439 posix_name(const struct file_name *names, bool assume_exists) 1440 { 1441 char *path = NULL; 1442 int i; 1443 1444 /* 1445 * POSIX states that the filename will be chosen from one 1446 * of the old, new and index names (in that order) if 1447 * the file exists relative to CWD after -p stripping. 1448 */ 1449 for (i = 0; i < MAX_FILE; i++) { 1450 if (names[i].path != NULL && names[i].exists) { 1451 path = names[i].path; 1452 break; 1453 } 1454 } 1455 if (path == NULL && !assume_exists) { 1456 /* 1457 * No files found, look for something we can checkout from 1458 * RCS/SCCS dirs. Same order as above. 1459 */ 1460 for (i = 0; i < MAX_FILE; i++) { 1461 if (names[i].path != NULL && 1462 (path = checked_in(names[i].path)) != NULL) 1463 break; 1464 } 1465 /* 1466 * Still no match? Check to see if the diff could be creating 1467 * a new file. 1468 */ 1469 if (path == NULL && ok_to_create_file && 1470 names[NEW_FILE].path != NULL) 1471 path = names[NEW_FILE].path; 1472 } 1473 1474 return path ? savestr(path) : NULL; 1475 } 1476 1477 /* 1478 * Choose the name of the file to be patched based the "best" one 1479 * available. 1480 */ 1481 static char * 1482 best_name(const struct file_name *names, bool assume_exists) 1483 { 1484 size_t min_components, min_baselen, min_len, tmp; 1485 char *best = NULL; 1486 int i; 1487 1488 /* 1489 * The "best" name is the one with the fewest number of path 1490 * components, the shortest basename length, and the shortest 1491 * overall length (in that order). We only use the Index: file 1492 * if neither of the old or new files could be intuited from 1493 * the diff header. 1494 */ 1495 min_components = min_baselen = min_len = SIZE_MAX; 1496 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1497 if (names[i].path == NULL || 1498 (!names[i].exists && !assume_exists)) 1499 continue; 1500 if ((tmp = num_components(names[i].path)) > min_components) 1501 continue; 1502 min_components = tmp; 1503 if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1504 continue; 1505 min_baselen = tmp; 1506 if ((tmp = strlen(names[i].path)) > min_len) 1507 continue; 1508 min_len = tmp; 1509 best = names[i].path; 1510 } 1511 if (best == NULL) { 1512 /* 1513 * No files found, look for something we can checkout from 1514 * RCS/SCCS dirs. Logic is identical to that above... 1515 */ 1516 min_components = min_baselen = min_len = SIZE_MAX; 1517 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1518 if (names[i].path == NULL || 1519 checked_in(names[i].path) == NULL) 1520 continue; 1521 if ((tmp = num_components(names[i].path)) > min_components) 1522 continue; 1523 min_components = tmp; 1524 if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1525 continue; 1526 min_baselen = tmp; 1527 if ((tmp = strlen(names[i].path)) > min_len) 1528 continue; 1529 min_len = tmp; 1530 best = names[i].path; 1531 } 1532 /* 1533 * Still no match? Check to see if the diff could be creating 1534 * a new file. 1535 */ 1536 if (best == NULL && ok_to_create_file && 1537 names[NEW_FILE].path != NULL) 1538 best = names[NEW_FILE].path; 1539 } 1540 1541 return best ? savestr(best) : NULL; 1542 } 1543 1544 static size_t 1545 num_components(const char *path) 1546 { 1547 size_t n; 1548 const char *cp; 1549 1550 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1551 while (*cp == '/') 1552 cp++; /* skip consecutive slashes */ 1553 } 1554 return n; 1555 } 1556