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 */ 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 if (ferror(pfp) || fclose(pfp)) 113 pfatal("can't write %s", TMPPATNAME); 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, buf_len, 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((unsigned char)*t) || *t == ','; t++) 291 ; 292 this_is_a_command = (isdigit((unsigned char)*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((unsigned char)*t); t++) 314 ; 315 revision = savestr(t); 316 for (t = revision; *t && !isspace((unsigned char)*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, buf_len, 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 fillsrc = 0; 512 filldst = 0; 513 ptrn_spaces_eaten = false; 514 repl_could_be_missing = true; 515 repl_missing = false; 516 repl_backtrack_position = 0; 517 repl_patch_line = 0; 518 ptrn_copiable = 0; 519 520 ret = pgets(buf, buf_len, pfp); 521 p_input_line++; 522 if (ret == NULL || strnNE(buf, "********", 8)) { 523 next_intuit_at(line_beginning, p_input_line); 524 return false; 525 } 526 p_context = 100; 527 p_hunk_beg = p_input_line + 1; 528 while (p_end < p_max) { 529 line_beginning = ftell(pfp); 530 ret = pgets(buf, buf_len, pfp); 531 p_input_line++; 532 if (ret == NULL) { 533 if (p_max - p_end < 4) { 534 /* assume blank lines got chopped */ 535 strlcpy(buf, " \n", buf_len); 536 } else { 537 if (repl_beginning && repl_could_be_missing) { 538 repl_missing = true; 539 goto hunk_done; 540 } 541 fatal("unexpected end of file in patch\n"); 542 } 543 } 544 p_end++; 545 if (p_end >= hunkmax) 546 fatal("Internal error: hunk larger than hunk " 547 "buffer size"); 548 p_char[p_end] = *buf; 549 p_line[p_end] = NULL; 550 switch (*buf) { 551 case '*': 552 if (strnEQ(buf, "********", 8)) { 553 if (repl_beginning && repl_could_be_missing) { 554 repl_missing = true; 555 goto hunk_done; 556 } else 557 fatal("unexpected end of hunk " 558 "at line %ld\n", 559 p_input_line); 560 } 561 if (p_end != 0) { 562 if (repl_beginning && repl_could_be_missing) { 563 repl_missing = true; 564 goto hunk_done; 565 } 566 fatal("unexpected *** at line %ld: %s", 567 p_input_line, buf); 568 } 569 context = 0; 570 p_line[p_end] = savestr(buf); 571 if (out_of_mem) { 572 p_end--; 573 return false; 574 } 575 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 576 ; 577 if (!*s) 578 malformed(); 579 if (strnEQ(s, "0,0", 3)) 580 memmove(s, s + 2, strlen(s + 2) + 1); 581 p_first = (LINENUM) atol(s); 582 while (isdigit((unsigned char)*s)) 583 s++; 584 if (*s == ',') { 585 for (; *s && !isdigit((unsigned char)*s); s++) 586 ; 587 if (!*s) 588 malformed(); 589 p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1; 590 } else if (p_first) 591 p_ptrn_lines = 1; 592 else { 593 p_ptrn_lines = 0; 594 p_first = 1; 595 } 596 597 /* we need this much at least */ 598 p_max = p_ptrn_lines + 6; 599 while (p_max >= hunkmax) 600 grow_hunkmax(); 601 p_max = hunkmax; 602 break; 603 case '-': 604 if (buf[1] == '-') { 605 if (repl_beginning || 606 (p_end != p_ptrn_lines + 1 + 607 (p_char[p_end - 1] == '\n'))) { 608 if (p_end == 1) { 609 /* 610 * `old' lines were omitted; 611 * set up to fill them in 612 * from 'new' context lines. 613 */ 614 p_end = p_ptrn_lines + 1; 615 fillsrc = p_end + 1; 616 filldst = 1; 617 fillcnt = p_ptrn_lines; 618 } else { 619 if (repl_beginning) { 620 if (repl_could_be_missing) { 621 repl_missing = true; 622 goto hunk_done; 623 } 624 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 625 p_input_line, p_hunk_beg + repl_beginning); 626 } else { 627 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 628 (p_end <= p_ptrn_lines 629 ? "Premature" 630 : "Overdue"), 631 p_input_line, p_hunk_beg); 632 } 633 } 634 } 635 repl_beginning = p_end; 636 repl_backtrack_position = ftell(pfp); 637 repl_patch_line = p_input_line; 638 p_line[p_end] = savestr(buf); 639 if (out_of_mem) { 640 p_end--; 641 return false; 642 } 643 p_char[p_end] = '='; 644 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 645 ; 646 if (!*s) 647 malformed(); 648 p_newfirst = (LINENUM) atol(s); 649 while (isdigit((unsigned char)*s)) 650 s++; 651 if (*s == ',') { 652 for (; *s && !isdigit((unsigned char)*s); s++) 653 ; 654 if (!*s) 655 malformed(); 656 p_repl_lines = ((LINENUM) atol(s)) - 657 p_newfirst + 1; 658 } else if (p_newfirst) 659 p_repl_lines = 1; 660 else { 661 p_repl_lines = 0; 662 p_newfirst = 1; 663 } 664 p_max = p_repl_lines + p_end; 665 if (p_max > MAXHUNKSIZE) 666 fatal("hunk too large (%ld lines) at line %ld: %s", 667 p_max, p_input_line, buf); 668 while (p_max >= hunkmax) 669 grow_hunkmax(); 670 if (p_repl_lines != ptrn_copiable && 671 (p_context != 0 || p_repl_lines != 1)) 672 repl_could_be_missing = false; 673 break; 674 } 675 goto change_line; 676 case '+': 677 case '!': 678 repl_could_be_missing = false; 679 change_line: 680 if (buf[1] == '\n' && canonicalize) 681 strlcpy(buf + 1, " \n", buf_len - 1); 682 if (!isspace((unsigned char)buf[1]) && buf[1] != '>' && 683 buf[1] != '<' && 684 repl_beginning && repl_could_be_missing) { 685 repl_missing = true; 686 goto hunk_done; 687 } 688 if (context >= 0) { 689 if (context < p_context) 690 p_context = context; 691 context = -1000; 692 } 693 p_line[p_end] = savestr(buf + 2); 694 if (out_of_mem) { 695 p_end--; 696 return false; 697 } 698 if (p_end == p_ptrn_lines) { 699 if (remove_special_line()) { 700 int len; 701 702 len = strlen(p_line[p_end]) - 1; 703 (p_line[p_end])[len] = 0; 704 } 705 } 706 break; 707 case '\t': 708 case '\n': /* assume the 2 spaces got eaten */ 709 if (repl_beginning && repl_could_be_missing && 710 (!ptrn_spaces_eaten || 711 diff_type == NEW_CONTEXT_DIFF)) { 712 repl_missing = true; 713 goto hunk_done; 714 } 715 p_line[p_end] = savestr(buf); 716 if (out_of_mem) { 717 p_end--; 718 return false; 719 } 720 if (p_end != p_ptrn_lines + 1) { 721 ptrn_spaces_eaten |= (repl_beginning != 0); 722 context++; 723 if (!repl_beginning) 724 ptrn_copiable++; 725 p_char[p_end] = ' '; 726 } 727 break; 728 case ' ': 729 if (!isspace((unsigned char)buf[1]) && 730 repl_beginning && repl_could_be_missing) { 731 repl_missing = true; 732 goto hunk_done; 733 } 734 context++; 735 if (!repl_beginning) 736 ptrn_copiable++; 737 p_line[p_end] = savestr(buf + 2); 738 if (out_of_mem) { 739 p_end--; 740 return false; 741 } 742 break; 743 default: 744 if (repl_beginning && repl_could_be_missing) { 745 repl_missing = true; 746 goto hunk_done; 747 } 748 malformed(); 749 } 750 /* set up p_len for strncmp() so we don't have to */ 751 /* assume null termination */ 752 if (p_line[p_end]) 753 p_len[p_end] = strlen(p_line[p_end]); 754 else 755 p_len[p_end] = 0; 756 } 757 758 hunk_done: 759 if (p_end >= 0 && !repl_beginning) 760 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 761 762 if (repl_missing) { 763 764 /* reset state back to just after --- */ 765 p_input_line = repl_patch_line; 766 for (p_end--; p_end > repl_beginning; p_end--) 767 free(p_line[p_end]); 768 fseek(pfp, repl_backtrack_position, SEEK_SET); 769 770 /* redundant 'new' context lines were omitted - set */ 771 /* up to fill them in from the old file context */ 772 if (!p_context && p_repl_lines == 1) { 773 p_repl_lines = 0; 774 p_max--; 775 } 776 fillsrc = 1; 777 filldst = repl_beginning + 1; 778 fillcnt = p_repl_lines; 779 p_end = p_max; 780 } else if (!p_context && fillcnt == 1) { 781 /* the first hunk was a null hunk with no context */ 782 /* and we were expecting one line -- fix it up. */ 783 while (filldst < p_end) { 784 p_line[filldst] = p_line[filldst + 1]; 785 p_char[filldst] = p_char[filldst + 1]; 786 p_len[filldst] = p_len[filldst + 1]; 787 filldst++; 788 } 789 #if 0 790 repl_beginning--; /* this doesn't need to be fixed */ 791 #endif 792 p_end--; 793 p_first++; /* do append rather than insert */ 794 fillcnt = 0; 795 p_ptrn_lines = 0; 796 } 797 if (diff_type == CONTEXT_DIFF && 798 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 799 if (verbose) 800 say("%s\n%s\n%s\n", 801 "(Fascinating--this is really a new-style context diff but without", 802 "the telltale extra asterisks on the *** line that usually indicate", 803 "the new style...)"); 804 diff_type = NEW_CONTEXT_DIFF; 805 } 806 /* if there were omitted context lines, fill them in now */ 807 if (fillcnt) { 808 p_bfake = filldst; /* remember where not to free() */ 809 p_efake = filldst + fillcnt - 1; 810 while (fillcnt-- > 0) { 811 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 812 fillsrc++; 813 if (fillsrc > p_end) 814 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 815 p_hunk_beg); 816 p_line[filldst] = p_line[fillsrc]; 817 p_char[filldst] = p_char[fillsrc]; 818 p_len[filldst] = p_len[fillsrc]; 819 fillsrc++; 820 filldst++; 821 } 822 while (fillsrc <= p_end && fillsrc != repl_beginning && 823 p_char[fillsrc] != ' ') 824 fillsrc++; 825 #ifdef DEBUGGING 826 if (debug & 64) 827 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 828 fillsrc, filldst, repl_beginning, p_end + 1); 829 #endif 830 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 831 malformed(); 832 if (filldst != p_end + 1 && filldst != repl_beginning) 833 malformed(); 834 } 835 if (p_line[p_end] != NULL) { 836 if (remove_special_line()) { 837 p_len[p_end] -= 1; 838 (p_line[p_end])[p_len[p_end]] = 0; 839 } 840 } 841 } else if (diff_type == UNI_DIFF) { 842 LINENUM fillold; /* index of old lines */ 843 LINENUM fillnew; /* index of new lines */ 844 char ch; 845 846 line_beginning = ftell(pfp); /* file pos of the current line */ 847 ret = pgets(buf, buf_len, pfp); 848 p_input_line++; 849 if (ret == NULL || strnNE(buf, "@@ -", 4)) { 850 next_intuit_at(line_beginning, p_input_line); 851 return false; 852 } 853 s = buf + 4; 854 if (!*s) 855 malformed(); 856 p_first = (LINENUM) atol(s); 857 while (isdigit((unsigned char)*s)) 858 s++; 859 if (*s == ',') { 860 p_ptrn_lines = (LINENUM) atol(++s); 861 while (isdigit((unsigned char)*s)) 862 s++; 863 } else 864 p_ptrn_lines = 1; 865 if (*s == ' ') 866 s++; 867 if (*s != '+' || !*++s) 868 malformed(); 869 p_newfirst = (LINENUM) atol(s); 870 while (isdigit((unsigned char)*s)) 871 s++; 872 if (*s == ',') { 873 p_repl_lines = (LINENUM) atol(++s); 874 while (isdigit((unsigned char)*s)) 875 s++; 876 } else 877 p_repl_lines = 1; 878 if (*s == ' ') 879 s++; 880 if (*s != '@') 881 malformed(); 882 if (!p_ptrn_lines) 883 p_first++; /* do append rather than insert */ 884 p_max = p_ptrn_lines + p_repl_lines + 1; 885 while (p_max >= hunkmax) 886 grow_hunkmax(); 887 fillold = 1; 888 fillnew = fillold + p_ptrn_lines; 889 p_end = fillnew + p_repl_lines; 890 snprintf(buf, buf_len, "*** %ld,%ld ****\n", p_first, 891 p_first + p_ptrn_lines - 1); 892 p_line[0] = savestr(buf); 893 if (out_of_mem) { 894 p_end = -1; 895 return false; 896 } 897 p_char[0] = '*'; 898 snprintf(buf, buf_len, "--- %ld,%ld ----\n", p_newfirst, 899 p_newfirst + p_repl_lines - 1); 900 p_line[fillnew] = savestr(buf); 901 if (out_of_mem) { 902 p_end = 0; 903 return false; 904 } 905 p_char[fillnew++] = '='; 906 p_context = 100; 907 context = 0; 908 p_hunk_beg = p_input_line + 1; 909 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 910 line_beginning = ftell(pfp); 911 ret = pgets(buf, buf_len, pfp); 912 p_input_line++; 913 if (ret == NULL) { 914 if (p_max - fillnew < 3) { 915 /* assume blank lines got chopped */ 916 strlcpy(buf, " \n", buf_len); 917 } else { 918 fatal("unexpected end of file in patch\n"); 919 } 920 } 921 if (*buf == '\t' || *buf == '\n') { 922 ch = ' '; /* assume the space got eaten */ 923 s = savestr(buf); 924 } else { 925 ch = *buf; 926 s = savestr(buf + 1); 927 } 928 if (out_of_mem) { 929 while (--fillnew > p_ptrn_lines) 930 free(p_line[fillnew]); 931 p_end = fillold - 1; 932 return false; 933 } 934 switch (ch) { 935 case '-': 936 if (fillold > p_ptrn_lines) { 937 free(s); 938 p_end = fillnew - 1; 939 malformed(); 940 } 941 p_char[fillold] = ch; 942 p_line[fillold] = s; 943 p_len[fillold++] = strlen(s); 944 if (fillold > p_ptrn_lines) { 945 if (remove_special_line()) { 946 p_len[fillold - 1] -= 1; 947 s[p_len[fillold - 1]] = 0; 948 } 949 } 950 break; 951 case '=': 952 ch = ' '; 953 /* FALL THROUGH */ 954 case ' ': 955 if (fillold > p_ptrn_lines) { 956 free(s); 957 while (--fillnew > p_ptrn_lines) 958 free(p_line[fillnew]); 959 p_end = fillold - 1; 960 malformed(); 961 } 962 context++; 963 p_char[fillold] = ch; 964 p_line[fillold] = s; 965 p_len[fillold++] = strlen(s); 966 s = savestr(s); 967 if (out_of_mem) { 968 while (--fillnew > p_ptrn_lines) 969 free(p_line[fillnew]); 970 p_end = fillold - 1; 971 return false; 972 } 973 if (fillold > p_ptrn_lines) { 974 if (remove_special_line()) { 975 p_len[fillold - 1] -= 1; 976 s[p_len[fillold - 1]] = 0; 977 } 978 } 979 /* FALL THROUGH */ 980 case '+': 981 if (fillnew > p_end) { 982 free(s); 983 while (--fillnew > p_ptrn_lines) 984 free(p_line[fillnew]); 985 p_end = fillold - 1; 986 malformed(); 987 } 988 p_char[fillnew] = ch; 989 p_line[fillnew] = s; 990 p_len[fillnew++] = strlen(s); 991 if (fillold > p_ptrn_lines) { 992 if (remove_special_line()) { 993 p_len[fillnew - 1] -= 1; 994 s[p_len[fillnew - 1]] = 0; 995 } 996 } 997 break; 998 default: 999 p_end = fillnew; 1000 malformed(); 1001 } 1002 if (ch != ' ' && context > 0) { 1003 if (context < p_context) 1004 p_context = context; 1005 context = -1000; 1006 } 1007 } /* while */ 1008 } else { /* normal diff--fake it up */ 1009 char hunk_type; 1010 int i; 1011 LINENUM min, max; 1012 1013 line_beginning = ftell(pfp); 1014 p_context = 0; 1015 ret = pgets(buf, buf_len, pfp); 1016 p_input_line++; 1017 if (ret == NULL || !isdigit((unsigned char)*buf)) { 1018 next_intuit_at(line_beginning, p_input_line); 1019 return false; 1020 } 1021 p_first = (LINENUM) atol(buf); 1022 for (s = buf; isdigit((unsigned char)*s); s++) 1023 ; 1024 if (*s == ',') { 1025 p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1; 1026 while (isdigit((unsigned char)*s)) 1027 s++; 1028 } else 1029 p_ptrn_lines = (*s != 'a'); 1030 hunk_type = *s; 1031 if (hunk_type == 'a') 1032 p_first++; /* do append rather than insert */ 1033 min = (LINENUM) atol(++s); 1034 for (; isdigit((unsigned char)*s); s++) 1035 ; 1036 if (*s == ',') 1037 max = (LINENUM) atol(++s); 1038 else 1039 max = min; 1040 if (hunk_type == 'd') 1041 min++; 1042 p_end = p_ptrn_lines + 1 + max - min + 1; 1043 if (p_end > MAXHUNKSIZE) 1044 fatal("hunk too large (%ld lines) at line %ld: %s", 1045 p_end, p_input_line, buf); 1046 while (p_end >= hunkmax) 1047 grow_hunkmax(); 1048 p_newfirst = min; 1049 p_repl_lines = max - min + 1; 1050 snprintf(buf, buf_len, "*** %ld,%ld\n", p_first, 1051 p_first + p_ptrn_lines - 1); 1052 p_line[0] = savestr(buf); 1053 if (out_of_mem) { 1054 p_end = -1; 1055 return false; 1056 } 1057 p_char[0] = '*'; 1058 for (i = 1; i <= p_ptrn_lines; i++) { 1059 ret = pgets(buf, buf_len, pfp); 1060 p_input_line++; 1061 if (ret == NULL) 1062 fatal("unexpected end of file in patch at line %ld\n", 1063 p_input_line); 1064 if (*buf != '<') 1065 fatal("< expected at line %ld of patch\n", 1066 p_input_line); 1067 p_line[i] = savestr(buf + 2); 1068 if (out_of_mem) { 1069 p_end = i - 1; 1070 return false; 1071 } 1072 p_len[i] = strlen(p_line[i]); 1073 p_char[i] = '-'; 1074 } 1075 1076 if (remove_special_line()) { 1077 p_len[i - 1] -= 1; 1078 (p_line[i - 1])[p_len[i - 1]] = 0; 1079 } 1080 if (hunk_type == 'c') { 1081 ret = pgets(buf, buf_len, pfp); 1082 p_input_line++; 1083 if (ret == NULL) 1084 fatal("unexpected end of file in patch at line %ld\n", 1085 p_input_line); 1086 if (*buf != '-') 1087 fatal("--- expected at line %ld of patch\n", 1088 p_input_line); 1089 } 1090 snprintf(buf, buf_len, "--- %ld,%ld\n", min, max); 1091 p_line[i] = savestr(buf); 1092 if (out_of_mem) { 1093 p_end = i - 1; 1094 return false; 1095 } 1096 p_char[i] = '='; 1097 for (i++; i <= p_end; i++) { 1098 ret = pgets(buf, buf_len, pfp); 1099 p_input_line++; 1100 if (ret == NULL) 1101 fatal("unexpected end of file in patch at line %ld\n", 1102 p_input_line); 1103 if (*buf != '>') 1104 fatal("> expected at line %ld of patch\n", 1105 p_input_line); 1106 p_line[i] = savestr(buf + 2); 1107 if (out_of_mem) { 1108 p_end = i - 1; 1109 return false; 1110 } 1111 p_len[i] = strlen(p_line[i]); 1112 p_char[i] = '+'; 1113 } 1114 1115 if (remove_special_line()) { 1116 p_len[i - 1] -= 1; 1117 (p_line[i - 1])[p_len[i - 1]] = 0; 1118 } 1119 } 1120 if (reverse) /* backwards patch? */ 1121 if (!pch_swap()) 1122 say("Not enough memory to swap next hunk!\n"); 1123 #ifdef DEBUGGING 1124 if (debug & 2) { 1125 int i; 1126 char special; 1127 1128 for (i = 0; i <= p_end; i++) { 1129 if (i == p_ptrn_lines) 1130 special = '^'; 1131 else 1132 special = ' '; 1133 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1134 special, p_line[i]); 1135 fflush(stderr); 1136 } 1137 } 1138 #endif 1139 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1140 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1141 return true; 1142 } 1143 1144 /* 1145 * Input a line from the patch file, worrying about indentation. 1146 */ 1147 static char * 1148 pgets(char *bf, int sz, FILE *fp) 1149 { 1150 char *s, *ret = fgets(bf, sz, fp); 1151 int indent = 0; 1152 1153 if (p_indent && ret != NULL) { 1154 for (s = buf; 1155 indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X'); 1156 s++) { 1157 if (*s == '\t') 1158 indent += 8 - (indent % 7); 1159 else 1160 indent++; 1161 } 1162 if (buf != s && strlcpy(buf, s, buf_len) >= buf_len) 1163 fatal("buffer too small in pgets()\n"); 1164 } 1165 return ret; 1166 } 1167 1168 /* 1169 * Reverse the old and new portions of the current hunk. 1170 */ 1171 bool 1172 pch_swap(void) 1173 { 1174 char **tp_line; /* the text of the hunk */ 1175 short *tp_len; /* length of each line */ 1176 char *tp_char; /* +, -, and ! */ 1177 LINENUM i; 1178 LINENUM n; 1179 bool blankline = false; 1180 char *s; 1181 1182 i = p_first; 1183 p_first = p_newfirst; 1184 p_newfirst = i; 1185 1186 /* make a scratch copy */ 1187 1188 tp_line = p_line; 1189 tp_len = p_len; 1190 tp_char = p_char; 1191 p_line = NULL; /* force set_hunkmax to allocate again */ 1192 p_len = NULL; 1193 p_char = NULL; 1194 set_hunkmax(); 1195 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1196 1197 free(p_line); 1198 p_line = tp_line; 1199 free(p_len); 1200 p_len = tp_len; 1201 free(p_char); 1202 p_char = tp_char; 1203 return false; /* not enough memory to swap hunk! */ 1204 } 1205 /* now turn the new into the old */ 1206 1207 i = p_ptrn_lines + 1; 1208 if (tp_char[i] == '\n') { /* account for possible blank line */ 1209 blankline = true; 1210 i++; 1211 } 1212 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1213 if (p_efake <= i) 1214 n = p_end - i + 1; 1215 else 1216 n = -i; 1217 p_efake += n; 1218 p_bfake += n; 1219 } 1220 for (n = 0; i <= p_end; i++, n++) { 1221 p_line[n] = tp_line[i]; 1222 p_char[n] = tp_char[i]; 1223 if (p_char[n] == '+') 1224 p_char[n] = '-'; 1225 p_len[n] = tp_len[i]; 1226 } 1227 if (blankline) { 1228 i = p_ptrn_lines + 1; 1229 p_line[n] = tp_line[i]; 1230 p_char[n] = tp_char[i]; 1231 p_len[n] = tp_len[i]; 1232 n++; 1233 } 1234 if (p_char[0] != '=') 1235 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1236 p_input_line, p_char[0]); 1237 p_char[0] = '*'; 1238 for (s = p_line[0]; *s; s++) 1239 if (*s == '-') 1240 *s = '*'; 1241 1242 /* now turn the old into the new */ 1243 1244 if (p_char[0] != '*') 1245 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1246 p_input_line, p_char[0]); 1247 tp_char[0] = '='; 1248 for (s = tp_line[0]; *s; s++) 1249 if (*s == '*') 1250 *s = '-'; 1251 for (i = 0; n <= p_end; i++, n++) { 1252 p_line[n] = tp_line[i]; 1253 p_char[n] = tp_char[i]; 1254 if (p_char[n] == '-') 1255 p_char[n] = '+'; 1256 p_len[n] = tp_len[i]; 1257 } 1258 1259 if (i != p_ptrn_lines + 1) 1260 fatal("Malformed patch at line %ld: expected %ld lines, " 1261 "got %ld\n", 1262 p_input_line, p_ptrn_lines + 1, i); 1263 1264 i = p_ptrn_lines; 1265 p_ptrn_lines = p_repl_lines; 1266 p_repl_lines = i; 1267 1268 free(tp_line); 1269 free(tp_len); 1270 free(tp_char); 1271 1272 return true; 1273 } 1274 1275 /* 1276 * Return the specified line position in the old file of the old context. 1277 */ 1278 LINENUM 1279 pch_first(void) 1280 { 1281 return p_first; 1282 } 1283 1284 /* 1285 * Return the number of lines of old context. 1286 */ 1287 LINENUM 1288 pch_ptrn_lines(void) 1289 { 1290 return p_ptrn_lines; 1291 } 1292 1293 /* 1294 * Return the probable line position in the new file of the first line. 1295 */ 1296 LINENUM 1297 pch_newfirst(void) 1298 { 1299 return p_newfirst; 1300 } 1301 1302 /* 1303 * Return the number of lines in the replacement text including context. 1304 */ 1305 LINENUM 1306 pch_repl_lines(void) 1307 { 1308 return p_repl_lines; 1309 } 1310 1311 /* 1312 * Return the number of lines in the whole hunk. 1313 */ 1314 LINENUM 1315 pch_end(void) 1316 { 1317 return p_end; 1318 } 1319 1320 /* 1321 * Return the number of context lines before the first changed line. 1322 */ 1323 LINENUM 1324 pch_context(void) 1325 { 1326 return p_context; 1327 } 1328 1329 /* 1330 * Return the length of a particular patch line. 1331 */ 1332 short 1333 pch_line_len(LINENUM line) 1334 { 1335 return p_len[line]; 1336 } 1337 1338 /* 1339 * Return the control character (+, -, *, !, etc) for a patch line. 1340 */ 1341 char 1342 pch_char(LINENUM line) 1343 { 1344 return p_char[line]; 1345 } 1346 1347 /* 1348 * Return a pointer to a particular patch line. 1349 */ 1350 char * 1351 pfetch(LINENUM line) 1352 { 1353 return p_line[line]; 1354 } 1355 1356 /* 1357 * Return where in the patch file this hunk began, for error messages. 1358 */ 1359 LINENUM 1360 pch_hunk_beg(void) 1361 { 1362 return p_hunk_beg; 1363 } 1364 1365 /* 1366 * Apply an ed script by feeding ed itself. 1367 */ 1368 void 1369 do_ed_script(void) 1370 { 1371 char *t; 1372 long beginning_of_this_line; 1373 FILE *pipefp = NULL; 1374 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