1 /* $OpenBSD: pch.c,v 1.59 2017/12/20 21:08:06 tb Exp $ */ 2 3 /* 4 * patch - a program to apply diffs to original files 5 * 6 * Copyright 1986, Larry Wall 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following condition is met: 10 * 1. Redistributions of source code must retain the above copyright notice, 11 * this condition and the following disclaimer. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 17 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 26 * behaviour 27 */ 28 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 32 #include <ctype.h> 33 #include <libgen.h> 34 #include <limits.h> 35 #include <stdint.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 #include "common.h" 42 #include "util.h" 43 #include "pch.h" 44 #include "pathnames.h" 45 46 /* Patch (diff listing) abstract type. */ 47 48 FILE *pfp = NULL; /* patch file pointer */ 49 LINENUM p_input_line = 0; /* current line # from patch file */ 50 51 static off_t p_filesize; /* size of the patch file */ 52 static LINENUM p_first; /* 1st line number */ 53 static LINENUM p_newfirst; /* 1st line number of replacement */ 54 static LINENUM p_ptrn_lines; /* # lines in pattern */ 55 static LINENUM p_repl_lines; /* # lines in replacement text */ 56 static LINENUM p_end = -1; /* last line in hunk */ 57 static LINENUM p_max; /* max allowed value of p_end */ 58 static LINENUM p_context = 3; /* # of context lines */ 59 static 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 off_t p_base; /* where to intuit this time */ 65 static LINENUM p_bline; /* line # of p_base */ 66 static off_t 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 char *bestguess = NULL; /* guess at correct filename */ 72 73 static void grow_hunkmax(void); 74 static int intuit_diff_type(void); 75 static void skip_to(off_t, LINENUM); 76 static char *best_name(const struct file_name *, bool); 77 static char *posix_name(const struct file_name *, bool); 78 static size_t num_components(const char *); 79 80 /* 81 * Prepare to look for the next patch in the patch file. 82 */ 83 void 84 re_patch(void) 85 { 86 p_first = 0; 87 p_newfirst = 0; 88 p_ptrn_lines = 0; 89 p_repl_lines = 0; 90 p_end = (LINENUM) - 1; 91 p_max = 0; 92 p_indent = 0; 93 } 94 95 /* 96 * Open the patch file at the beginning of time. 97 */ 98 void 99 open_patch_file(const char *filename) 100 { 101 struct stat filestat; 102 103 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 104 pfp = fopen(TMPPATNAME, "w"); 105 if (pfp == NULL) 106 pfatal("can't create %s", TMPPATNAME); 107 while (fgets(buf, sizeof buf, stdin) != NULL) 108 fputs(buf, pfp); 109 fclose(pfp); 110 filename = TMPPATNAME; 111 } 112 pfp = fopen(filename, "r"); 113 if (pfp == NULL) 114 pfatal("patch file %s not found", filename); 115 if (fstat(fileno(pfp), &filestat)) 116 pfatal("can't stat %s", filename); 117 p_filesize = filestat.st_size; 118 next_intuit_at(0, 1L); /* start at the beginning */ 119 set_hunkmax(); 120 } 121 122 /* 123 * Make sure our dynamically realloced tables are malloced to begin with. 124 */ 125 void 126 set_hunkmax(void) 127 { 128 if (p_line == NULL) 129 p_line = calloc((size_t) hunkmax, sizeof(char *)); 130 if (p_len == NULL) 131 p_len = calloc((size_t) hunkmax, sizeof(short)); 132 if (p_char == NULL) 133 p_char = calloc((size_t) hunkmax, sizeof(char)); 134 } 135 136 /* 137 * Enlarge the arrays containing the current hunk of patch. 138 */ 139 static void 140 grow_hunkmax(void) 141 { 142 int new_hunkmax; 143 char **new_p_line; 144 short *new_p_len; 145 char *new_p_char; 146 147 new_hunkmax = hunkmax * 2; 148 149 if (p_line == NULL || p_len == NULL || p_char == NULL) 150 fatal("Internal memory allocation error\n"); 151 152 new_p_line = reallocarray(p_line, new_hunkmax, sizeof(char *)); 153 if (new_p_line == NULL) 154 free(p_line); 155 156 new_p_len = reallocarray(p_len, new_hunkmax, sizeof(short)); 157 if (new_p_len == NULL) 158 free(p_len); 159 160 new_p_char = recallocarray(p_char, hunkmax, new_hunkmax, sizeof(char)); 161 if (new_p_char == NULL) 162 free(p_char); 163 164 p_char = new_p_char; 165 p_len = new_p_len; 166 p_line = new_p_line; 167 168 if (p_line != NULL && p_len != NULL && p_char != NULL) { 169 hunkmax = new_hunkmax; 170 return; 171 } 172 173 if (!using_plan_a) 174 fatal("out of memory\n"); 175 out_of_mem = true; /* whatever is null will be allocated again */ 176 /* from within plan_a(), of all places */ 177 } 178 179 /* True if the remainder of the patch file contains a diff of some sort. */ 180 181 bool 182 there_is_another_patch(void) 183 { 184 bool exists = false; 185 186 if (p_base != 0 && p_base >= p_filesize) { 187 if (verbose) 188 say("done\n"); 189 return false; 190 } 191 if (verbose) 192 say("Hmm..."); 193 diff_type = intuit_diff_type(); 194 if (!diff_type) { 195 if (p_base != 0) { 196 if (verbose) 197 say(" Ignoring the trailing garbage.\ndone\n"); 198 } else 199 say(" I can't seem to find a patch in there anywhere.\n"); 200 return false; 201 } 202 if (verbose) 203 say(" %sooks like %s to me...\n", 204 (p_base == 0 ? "L" : "The next patch l"), 205 diff_type == UNI_DIFF ? "a unified diff" : 206 diff_type == CONTEXT_DIFF ? "a context diff" : 207 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 208 diff_type == NORMAL_DIFF ? "a normal diff" : 209 "an ed script"); 210 if (p_indent && verbose) 211 say("(Patch is indented %d space%s.)\n", p_indent, 212 p_indent == 1 ? "" : "s"); 213 skip_to(p_start, p_sline); 214 while (filearg[0] == NULL) { 215 if (force || batch) { 216 say("No file to patch. Skipping...\n"); 217 filearg[0] = xstrdup(bestguess); 218 skip_rest_of_patch = true; 219 return true; 220 } 221 ask("File to patch: "); 222 if (*buf != '\n') { 223 free(bestguess); 224 bestguess = xstrdup(buf); 225 filearg[0] = fetchname(buf, &exists, 0); 226 } 227 if (!exists) { 228 int def_skip = *bestguess == '\0'; 229 ask("No file found--skip this patch? [%c] ", 230 def_skip ? 'y' : 'n'); 231 if (*buf == 'n' || (!def_skip && *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 off_t this_line = 0, previous_line; 250 off_t 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 int piece_of_git = 0; 258 259 memset(names, 0, sizeof(names)); 260 ok_to_create_file = false; 261 fseeko(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 = ftello(pfp); 268 indent = 0; 269 p_input_line++; 270 if (fgets(buf, sizeof buf, pfp) == NULL) { 271 if (first_command_line >= 0) { 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 < 0 && 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 size_t off = 4; 304 if (piece_of_git && strippath == 957 && 305 strnEQ(s, "--- a/", 6)) 306 off = 6; 307 names[NEW_FILE].path = fetchname(s + off, 308 &names[NEW_FILE].exists, strippath); 309 } else if (strnEQ(s, "+++ ", 4)) { 310 /* pretend it is the old name */ 311 size_t off = 4; 312 if (piece_of_git && strippath == 957 && 313 strnEQ(s, "+++ b/", 6)) 314 off = 6; 315 names[OLD_FILE].path = fetchname(s + off, 316 &names[OLD_FILE].exists, strippath); 317 } else if (strnEQ(s, "Index:", 6)) 318 names[INDEX_FILE].path = fetchname(s + 6, 319 &names[INDEX_FILE].exists, strippath); 320 else if (strnEQ(s, "Prereq:", 7)) { 321 for (t = s + 7; isspace((unsigned char)*t); t++) 322 ; 323 revision = xstrdup(t); 324 for (t = revision; 325 *t && !isspace((unsigned char)*t); t++) 326 ; 327 *t = '\0'; 328 if (*revision == '\0') { 329 free(revision); 330 revision = NULL; 331 } 332 } else if (strnEQ(s, "diff --git a/", 13)) 333 piece_of_git = 1; 334 if ((!diff_type || diff_type == ED_DIFF) && 335 first_command_line >= 0 && 336 strEQ(s, ".\n")) { 337 p_indent = indent; 338 p_start = first_command_line; 339 p_sline = fcl_line; 340 retval = ED_DIFF; 341 goto scan_exit; 342 } 343 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 344 if (strnEQ(s + 4, "0,0", 3)) 345 ok_to_create_file = true; 346 p_indent = indent; 347 p_start = this_line; 348 p_sline = p_input_line; 349 retval = UNI_DIFF; 350 goto scan_exit; 351 } 352 stars_this_line = strnEQ(s, "********", 8); 353 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 354 strnEQ(s, "*** ", 4)) { 355 if (strtolinenum(s + 4, &s) == 0) 356 ok_to_create_file = true; 357 /* 358 * If this is a new context diff the character just 359 * at the end of the line is a '*'. 360 */ 361 while (*s && *s != '\n') 362 s++; 363 p_indent = indent; 364 p_start = previous_line; 365 p_sline = p_input_line - 1; 366 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 367 goto scan_exit; 368 } 369 if ((!diff_type || diff_type == NORMAL_DIFF) && 370 last_line_was_command && 371 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 372 p_start = previous_line; 373 p_sline = p_input_line - 1; 374 p_indent = indent; 375 retval = NORMAL_DIFF; 376 goto scan_exit; 377 } 378 } 379 scan_exit: 380 if (retval == UNI_DIFF) { 381 /* unswap old and new */ 382 struct file_name tmp = names[OLD_FILE]; 383 names[OLD_FILE] = names[NEW_FILE]; 384 names[NEW_FILE] = tmp; 385 } 386 if (filearg[0] == NULL) { 387 if (posix) 388 filearg[0] = posix_name(names, ok_to_create_file); 389 else { 390 /* Ignore the Index: name for context diffs, like GNU */ 391 if (names[OLD_FILE].path != NULL || 392 names[NEW_FILE].path != NULL) { 393 free(names[INDEX_FILE].path); 394 names[INDEX_FILE].path = NULL; 395 } 396 filearg[0] = best_name(names, ok_to_create_file); 397 } 398 } 399 400 free(bestguess); 401 bestguess = NULL; 402 if (filearg[0] != NULL) 403 bestguess = xstrdup(filearg[0]); 404 else if (!ok_to_create_file) { 405 /* 406 * We don't want to create a new file but we need a 407 * filename to set bestguess. Avoid setting filearg[0] 408 * so the file is not created automatically. 409 */ 410 if (posix) 411 bestguess = posix_name(names, true); 412 else 413 bestguess = best_name(names, true); 414 } 415 free(names[OLD_FILE].path); 416 free(names[NEW_FILE].path); 417 free(names[INDEX_FILE].path); 418 return retval; 419 } 420 421 /* 422 * Remember where this patch ends so we know where to start up again. 423 */ 424 void 425 next_intuit_at(off_t file_pos, LINENUM file_line) 426 { 427 p_base = file_pos; 428 p_bline = file_line; 429 } 430 431 /* 432 * Basically a verbose fseeko() to the actual diff listing. 433 */ 434 static void 435 skip_to(off_t file_pos, LINENUM file_line) 436 { 437 char *ret; 438 439 if (p_base > file_pos) 440 fatal("Internal error: seek %lld>%lld\n", 441 (long long)p_base, (long long)file_pos); 442 if (verbose && p_base < file_pos) { 443 fseeko(pfp, p_base, SEEK_SET); 444 say("The text leading up to this was:\n--------------------------\n"); 445 while (ftello(pfp) < file_pos) { 446 ret = fgets(buf, sizeof buf, pfp); 447 if (ret == NULL) 448 fatal("Unexpected end of file\n"); 449 say("|%s", buf); 450 } 451 say("--------------------------\n"); 452 } else 453 fseeko(pfp, file_pos, SEEK_SET); 454 p_input_line = file_line - 1; 455 } 456 457 /* Make this a function for better debugging. */ 458 static void 459 malformed(void) 460 { 461 fatal("malformed patch at line %ld: %s", p_input_line, buf); 462 /* about as informative as "Syntax error" in C */ 463 } 464 465 /* 466 * True if the line has been discarded (i.e. it is a line saying 467 * "\ No newline at end of file".) 468 */ 469 static bool 470 remove_special_line(void) 471 { 472 int c; 473 474 c = fgetc(pfp); 475 if (c == '\\') { 476 do { 477 c = fgetc(pfp); 478 } while (c != EOF && c != '\n'); 479 480 return true; 481 } 482 if (c != EOF) 483 fseeko(pfp, -1, SEEK_CUR); 484 485 return false; 486 } 487 488 /* 489 * True if there is more of the current diff listing to process. 490 */ 491 bool 492 another_hunk(void) 493 { 494 off_t line_beginning; /* file pos of the current line */ 495 LINENUM repl_beginning; /* index of --- line */ 496 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 497 LINENUM fillsrc; /* index of first line to copy */ 498 LINENUM filldst; /* index of first missing line */ 499 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 500 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 501 bool repl_missing; /* we are now backtracking */ 502 off_t repl_backtrack_position; /* file pos of first repl line */ 503 LINENUM repl_patch_line; /* input line number for same */ 504 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 505 char *s, *ret; 506 int context = 0; 507 508 while (p_end >= 0) { 509 if (p_end == p_efake) 510 p_end = p_bfake; /* don't free twice */ 511 else 512 free(p_line[p_end]); 513 p_end--; 514 } 515 p_efake = -1; 516 517 p_max = hunkmax; /* gets reduced when --- found */ 518 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 519 line_beginning = ftello(pfp); 520 repl_beginning = 0; 521 fillcnt = 0; 522 fillsrc = 0; 523 ptrn_spaces_eaten = false; 524 repl_could_be_missing = true; 525 repl_missing = false; 526 repl_backtrack_position = 0; 527 repl_patch_line = 0; 528 ptrn_copiable = 0; 529 530 ret = pgets(buf, sizeof buf, pfp); 531 p_input_line++; 532 if (ret == NULL || strnNE(buf, "********", 8)) { 533 next_intuit_at(line_beginning, p_input_line); 534 return false; 535 } 536 p_context = 100; 537 p_hunk_beg = p_input_line + 1; 538 while (p_end < p_max) { 539 line_beginning = ftello(pfp); 540 ret = pgets(buf, sizeof buf, pfp); 541 p_input_line++; 542 if (ret == NULL) { 543 if (p_max - p_end < 4) { 544 /* assume blank lines got chopped */ 545 strlcpy(buf, " \n", sizeof buf); 546 } else { 547 if (repl_beginning && repl_could_be_missing) { 548 repl_missing = true; 549 goto hunk_done; 550 } 551 fatal("unexpected end of file in patch\n"); 552 } 553 } 554 p_end++; 555 if (p_end >= hunkmax) 556 fatal("Internal error: hunk larger than hunk " 557 "buffer size"); 558 p_char[p_end] = *buf; 559 p_line[p_end] = NULL; 560 switch (*buf) { 561 case '*': 562 if (strnEQ(buf, "********", 8)) { 563 if (repl_beginning && repl_could_be_missing) { 564 repl_missing = true; 565 goto hunk_done; 566 } else 567 fatal("unexpected end of hunk " 568 "at line %ld\n", 569 p_input_line); 570 } 571 if (p_end != 0) { 572 if (repl_beginning && repl_could_be_missing) { 573 repl_missing = true; 574 goto hunk_done; 575 } 576 fatal("unexpected *** at line %ld: %s", 577 p_input_line, buf); 578 } 579 context = 0; 580 p_line[p_end] = savestr(buf); 581 if (out_of_mem) { 582 p_end--; 583 return false; 584 } 585 for (s = buf; 586 *s && !isdigit((unsigned char)*s); s++) 587 ; 588 if (!*s) 589 malformed(); 590 if (strnEQ(s, "0,0", 3)) 591 memmove(s, s + 2, strlen(s + 2) + 1); 592 p_first = strtolinenum(s, &s); 593 if (*s == ',') { 594 for (; *s && !isdigit((unsigned char)*s); s++) 595 ; 596 if (!*s) 597 malformed(); 598 p_ptrn_lines = strtolinenum(s, &s) - p_first + 1; 599 if (p_ptrn_lines < 0) 600 malformed(); 601 } else if (p_first) 602 p_ptrn_lines = 1; 603 else { 604 p_ptrn_lines = 0; 605 p_first = 1; 606 } 607 if (p_first >= LINENUM_MAX - p_ptrn_lines || 608 p_ptrn_lines >= LINENUM_MAX - 6) 609 malformed(); 610 611 /* we need this much at least */ 612 p_max = p_ptrn_lines + 6; 613 while (p_max >= hunkmax) 614 grow_hunkmax(); 615 p_max = hunkmax; 616 break; 617 case '-': 618 if (buf[1] == '-') { 619 if (repl_beginning || 620 (p_end != p_ptrn_lines + 1 + 621 (p_char[p_end - 1] == '\n'))) { 622 if (p_end == 1) { 623 /* 624 * `old' lines were omitted; 625 * set up to fill them in 626 * from 'new' context lines. 627 */ 628 p_end = p_ptrn_lines + 1; 629 fillsrc = p_end + 1; 630 filldst = 1; 631 fillcnt = p_ptrn_lines; 632 } else { 633 if (repl_beginning) { 634 if (repl_could_be_missing) { 635 repl_missing = true; 636 goto hunk_done; 637 } 638 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 639 p_input_line, p_hunk_beg + repl_beginning); 640 } else { 641 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 642 (p_end <= p_ptrn_lines 643 ? "Premature" 644 : "Overdue"), 645 p_input_line, p_hunk_beg); 646 } 647 } 648 } 649 repl_beginning = p_end; 650 repl_backtrack_position = ftello(pfp); 651 repl_patch_line = p_input_line; 652 p_line[p_end] = savestr(buf); 653 if (out_of_mem) { 654 p_end--; 655 return false; 656 } 657 p_char[p_end] = '='; 658 for (s = buf; 659 *s && !isdigit((unsigned char)*s); s++) 660 ; 661 if (!*s) 662 malformed(); 663 p_newfirst = strtolinenum(s, &s); 664 if (*s == ',') { 665 for (; *s && !isdigit((unsigned char)*s); s++) 666 ; 667 if (!*s) 668 malformed(); 669 p_repl_lines = strtolinenum(s, &s) - 670 p_newfirst + 1; 671 if (p_repl_lines < 0) 672 malformed(); 673 } else if (p_newfirst) 674 p_repl_lines = 1; 675 else { 676 p_repl_lines = 0; 677 p_newfirst = 1; 678 } 679 if (p_newfirst >= LINENUM_MAX - p_repl_lines || 680 p_repl_lines >= LINENUM_MAX - p_end) 681 malformed(); 682 p_max = p_repl_lines + p_end; 683 if (p_max > MAXHUNKSIZE) 684 fatal("hunk too large (%ld lines) at line %ld: %s", 685 p_max, p_input_line, buf); 686 while (p_max >= hunkmax) 687 grow_hunkmax(); 688 if (p_repl_lines != ptrn_copiable && 689 (p_context != 0 || p_repl_lines != 1)) 690 repl_could_be_missing = false; 691 break; 692 } 693 goto change_line; 694 case '+': 695 case '!': 696 repl_could_be_missing = false; 697 change_line: 698 if (buf[1] == '\n' && canonicalize) 699 strlcpy(buf + 1, " \n", sizeof buf - 1); 700 if (!isspace((unsigned char)buf[1]) && 701 buf[1] != '>' && buf[1] != '<' && 702 repl_beginning && repl_could_be_missing) { 703 repl_missing = true; 704 goto hunk_done; 705 } 706 if (context >= 0) { 707 if (context < p_context) 708 p_context = context; 709 context = -1000; 710 } 711 p_line[p_end] = savestr(buf + 2); 712 if (out_of_mem) { 713 p_end--; 714 return false; 715 } 716 if (p_end == p_ptrn_lines) { 717 if (remove_special_line()) { 718 int len; 719 720 len = strlen(p_line[p_end]) - 1; 721 (p_line[p_end])[len] = 0; 722 } 723 } 724 break; 725 case '\t': 726 case '\n': /* assume the 2 spaces got eaten */ 727 if (repl_beginning && repl_could_be_missing && 728 (!ptrn_spaces_eaten || 729 diff_type == NEW_CONTEXT_DIFF)) { 730 repl_missing = true; 731 goto hunk_done; 732 } 733 p_line[p_end] = savestr(buf); 734 if (out_of_mem) { 735 p_end--; 736 return false; 737 } 738 if (p_end != p_ptrn_lines + 1) { 739 ptrn_spaces_eaten |= (repl_beginning != 0); 740 context++; 741 if (!repl_beginning) 742 ptrn_copiable++; 743 p_char[p_end] = ' '; 744 } 745 break; 746 case ' ': 747 if (!isspace((unsigned char)buf[1]) && 748 repl_beginning && repl_could_be_missing) { 749 repl_missing = true; 750 goto hunk_done; 751 } 752 context++; 753 if (!repl_beginning) 754 ptrn_copiable++; 755 p_line[p_end] = savestr(buf + 2); 756 if (out_of_mem) { 757 p_end--; 758 return false; 759 } 760 break; 761 default: 762 if (repl_beginning && repl_could_be_missing) { 763 repl_missing = true; 764 goto hunk_done; 765 } 766 malformed(); 767 } 768 /* set up p_len for strncmp() so we don't have to */ 769 /* assume null termination */ 770 if (p_line[p_end]) 771 p_len[p_end] = strlen(p_line[p_end]); 772 else 773 p_len[p_end] = 0; 774 } 775 776 hunk_done: 777 if (p_end >= 0 && !repl_beginning) 778 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 779 780 if (repl_missing) { 781 782 /* reset state back to just after --- */ 783 p_input_line = repl_patch_line; 784 for (p_end--; p_end > repl_beginning; p_end--) 785 free(p_line[p_end]); 786 fseeko(pfp, repl_backtrack_position, SEEK_SET); 787 788 /* redundant 'new' context lines were omitted - set */ 789 /* up to fill them in from the old file context */ 790 if (!p_context && p_repl_lines == 1) { 791 p_repl_lines = 0; 792 p_max--; 793 } 794 fillsrc = 1; 795 filldst = repl_beginning + 1; 796 fillcnt = p_repl_lines; 797 p_end = p_max; 798 } else if (!p_context && fillcnt == 1) { 799 /* the first hunk was a null hunk with no context */ 800 /* and we were expecting one line -- fix it up. */ 801 while (filldst < p_end) { 802 p_line[filldst] = p_line[filldst + 1]; 803 p_char[filldst] = p_char[filldst + 1]; 804 p_len[filldst] = p_len[filldst + 1]; 805 filldst++; 806 } 807 #if 0 808 repl_beginning--; /* this doesn't need to be fixed */ 809 #endif 810 p_end--; 811 p_first++; /* do append rather than insert */ 812 fillcnt = 0; 813 p_ptrn_lines = 0; 814 } 815 if (diff_type == CONTEXT_DIFF && 816 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 817 if (verbose) 818 say("%s\n%s\n%s\n", 819 "(Fascinating--this is really a new-style context diff but without", 820 "the telltale extra asterisks on the *** line that usually indicate", 821 "the new style...)"); 822 diff_type = NEW_CONTEXT_DIFF; 823 } 824 /* if there were omitted context lines, fill them in now */ 825 if (fillcnt) { 826 p_bfake = filldst; /* remember where not to free() */ 827 p_efake = filldst + fillcnt - 1; 828 while (fillcnt-- > 0) { 829 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 830 fillsrc++; 831 if (fillsrc > p_end) 832 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 833 p_hunk_beg); 834 p_line[filldst] = p_line[fillsrc]; 835 p_char[filldst] = p_char[fillsrc]; 836 p_len[filldst] = p_len[fillsrc]; 837 fillsrc++; 838 filldst++; 839 } 840 while (fillsrc <= p_end && fillsrc != repl_beginning && 841 p_char[fillsrc] != ' ') 842 fillsrc++; 843 #ifdef DEBUGGING 844 if (debug & 64) 845 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 846 fillsrc, filldst, repl_beginning, p_end + 1); 847 #endif 848 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 849 malformed(); 850 if (filldst != p_end + 1 && filldst != repl_beginning) 851 malformed(); 852 } 853 if (p_line[p_end] != NULL) { 854 if (remove_special_line()) { 855 p_len[p_end] -= 1; 856 (p_line[p_end])[p_len[p_end]] = 0; 857 } 858 } 859 } else if (diff_type == UNI_DIFF) { 860 off_t line_beginning = ftello(pfp); /* file pos of the current line */ 861 LINENUM fillsrc; /* index of old lines */ 862 LINENUM filldst; /* index of new lines */ 863 char ch; 864 865 ret = pgets(buf, sizeof buf, pfp); 866 p_input_line++; 867 if (ret == NULL || strnNE(buf, "@@ -", 4)) { 868 next_intuit_at(line_beginning, p_input_line); 869 return false; 870 } 871 s = buf + 4; 872 if (!*s) 873 malformed(); 874 p_first = strtolinenum(s, &s); 875 if (*s == ',') { 876 p_ptrn_lines = strtolinenum(s + 1, &s); 877 } else 878 p_ptrn_lines = 1; 879 if (*s == ' ') 880 s++; 881 if (*s != '+' || !*++s) 882 malformed(); 883 p_newfirst = strtolinenum(s, &s); 884 if (*s == ',') { 885 p_repl_lines = strtolinenum(s + 1, &s); 886 } else 887 p_repl_lines = 1; 888 if (*s == ' ') 889 s++; 890 if (*s != '@') 891 malformed(); 892 if (p_first >= LINENUM_MAX - p_ptrn_lines || 893 p_newfirst > LINENUM_MAX - p_repl_lines || 894 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 895 malformed(); 896 if (!p_ptrn_lines) 897 p_first++; /* do append rather than insert */ 898 p_max = p_ptrn_lines + p_repl_lines + 1; 899 while (p_max >= hunkmax) 900 grow_hunkmax(); 901 fillsrc = 1; 902 filldst = fillsrc + p_ptrn_lines; 903 p_end = filldst + p_repl_lines; 904 snprintf(buf, sizeof buf, "*** %ld,%ld ****\n", p_first, 905 p_first + p_ptrn_lines - 1); 906 p_line[0] = savestr(buf); 907 if (out_of_mem) { 908 p_end = -1; 909 return false; 910 } 911 p_char[0] = '*'; 912 snprintf(buf, sizeof buf, "--- %ld,%ld ----\n", p_newfirst, 913 p_newfirst + p_repl_lines - 1); 914 p_line[filldst] = savestr(buf); 915 if (out_of_mem) { 916 p_end = 0; 917 return false; 918 } 919 p_char[filldst++] = '='; 920 p_context = 100; 921 context = 0; 922 p_hunk_beg = p_input_line + 1; 923 while (fillsrc <= p_ptrn_lines || filldst <= p_end) { 924 line_beginning = ftello(pfp); 925 ret = pgets(buf, sizeof buf, pfp); 926 p_input_line++; 927 if (ret == NULL) { 928 if (p_max - filldst < 3) { 929 /* assume blank lines got chopped */ 930 strlcpy(buf, " \n", sizeof buf); 931 } else { 932 fatal("unexpected end of file in patch\n"); 933 } 934 } 935 if (*buf == '\t' || *buf == '\n') { 936 ch = ' '; /* assume the space got eaten */ 937 s = savestr(buf); 938 } else { 939 ch = *buf; 940 s = savestr(buf + 1); 941 } 942 if (out_of_mem) { 943 while (--filldst > p_ptrn_lines) 944 free(p_line[filldst]); 945 p_end = fillsrc - 1; 946 return false; 947 } 948 switch (ch) { 949 case '-': 950 if (fillsrc > p_ptrn_lines) { 951 free(s); 952 p_end = filldst - 1; 953 malformed(); 954 } 955 p_char[fillsrc] = ch; 956 p_line[fillsrc] = s; 957 p_len[fillsrc++] = strlen(s); 958 if (fillsrc > p_ptrn_lines) { 959 if (remove_special_line()) { 960 p_len[fillsrc - 1] -= 1; 961 s[p_len[fillsrc - 1]] = 0; 962 } 963 } 964 break; 965 case '=': 966 ch = ' '; 967 /* FALL THROUGH */ 968 case ' ': 969 if (fillsrc > p_ptrn_lines) { 970 free(s); 971 while (--filldst > p_ptrn_lines) 972 free(p_line[filldst]); 973 p_end = fillsrc - 1; 974 malformed(); 975 } 976 context++; 977 p_char[fillsrc] = ch; 978 p_line[fillsrc] = s; 979 p_len[fillsrc++] = strlen(s); 980 s = savestr(s); 981 if (out_of_mem) { 982 while (--filldst > p_ptrn_lines) 983 free(p_line[filldst]); 984 p_end = fillsrc - 1; 985 return false; 986 } 987 if (fillsrc > p_ptrn_lines) { 988 if (remove_special_line()) { 989 p_len[fillsrc - 1] -= 1; 990 s[p_len[fillsrc - 1]] = 0; 991 } 992 } 993 /* FALL THROUGH */ 994 case '+': 995 if (filldst > p_end) { 996 free(s); 997 while (--filldst > p_ptrn_lines) 998 free(p_line[filldst]); 999 p_end = fillsrc - 1; 1000 malformed(); 1001 } 1002 p_char[filldst] = ch; 1003 p_line[filldst] = s; 1004 p_len[filldst++] = strlen(s); 1005 if (fillsrc > p_ptrn_lines) { 1006 if (remove_special_line()) { 1007 p_len[filldst - 1] -= 1; 1008 s[p_len[filldst - 1]] = 0; 1009 } 1010 } 1011 break; 1012 default: 1013 p_end = filldst; 1014 malformed(); 1015 } 1016 if (ch != ' ' && context > 0) { 1017 if (context < p_context) 1018 p_context = context; 1019 context = -1000; 1020 } 1021 } /* while */ 1022 } else { /* normal diff--fake it up */ 1023 char hunk_type; 1024 int i; 1025 LINENUM min, max; 1026 off_t line_beginning = ftello(pfp); 1027 1028 p_context = 0; 1029 ret = pgets(buf, sizeof buf, pfp); 1030 p_input_line++; 1031 if (ret == NULL || !isdigit((unsigned char)*buf)) { 1032 next_intuit_at(line_beginning, p_input_line); 1033 return false; 1034 } 1035 p_first = strtolinenum(buf, &s); 1036 if (*s == ',') { 1037 p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1; 1038 if (p_ptrn_lines < 0) 1039 malformed(); 1040 } else 1041 p_ptrn_lines = (*s != 'a'); 1042 if (p_first >= LINENUM_MAX - p_ptrn_lines) 1043 malformed(); 1044 hunk_type = *s; 1045 if (hunk_type == 'a') 1046 p_first++; /* do append rather than insert */ 1047 min = strtolinenum(s + 1, &s); 1048 if (*s == ',') 1049 max = strtolinenum(s + 1, &s); 1050 else 1051 max = min; 1052 if (min < 0 || min > max || max - min == LINENUM_MAX) 1053 malformed(); 1054 if (hunk_type == 'd') 1055 min++; 1056 p_newfirst = min; 1057 p_repl_lines = max - min + 1; 1058 if (p_newfirst > LINENUM_MAX - p_repl_lines || 1059 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1060 malformed(); 1061 p_end = p_ptrn_lines + p_repl_lines + 1; 1062 if (p_end > MAXHUNKSIZE) 1063 fatal("hunk too large (%ld lines) at line %ld: %s", 1064 p_end, p_input_line, buf); 1065 while (p_end >= hunkmax) 1066 grow_hunkmax(); 1067 snprintf(buf, sizeof buf, "*** %ld,%ld\n", p_first, 1068 p_first + p_ptrn_lines - 1); 1069 p_line[0] = savestr(buf); 1070 if (out_of_mem) { 1071 p_end = -1; 1072 return false; 1073 } 1074 p_char[0] = '*'; 1075 for (i = 1; i <= p_ptrn_lines; i++) { 1076 ret = pgets(buf, sizeof buf, pfp); 1077 p_input_line++; 1078 if (ret == NULL) 1079 fatal("unexpected end of file in patch at line %ld\n", 1080 p_input_line); 1081 if (*buf != '<') 1082 fatal("< expected at line %ld of patch\n", 1083 p_input_line); 1084 p_line[i] = savestr(buf + 2); 1085 if (out_of_mem) { 1086 p_end = i - 1; 1087 return false; 1088 } 1089 p_len[i] = strlen(p_line[i]); 1090 p_char[i] = '-'; 1091 } 1092 1093 if (remove_special_line()) { 1094 p_len[i - 1] -= 1; 1095 (p_line[i - 1])[p_len[i - 1]] = 0; 1096 } 1097 if (hunk_type == 'c') { 1098 ret = pgets(buf, sizeof buf, 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 } 1107 snprintf(buf, sizeof(buf), "--- %ld,%ld\n", min, max); 1108 p_line[i] = savestr(buf); 1109 if (out_of_mem) { 1110 p_end = i - 1; 1111 return false; 1112 } 1113 p_char[i] = '='; 1114 for (i++; i <= p_end; i++) { 1115 ret = pgets(buf, sizeof buf, pfp); 1116 p_input_line++; 1117 if (ret == NULL) 1118 fatal("unexpected end of file in patch at line %ld\n", 1119 p_input_line); 1120 if (*buf != '>') 1121 fatal("> expected at line %ld of patch\n", 1122 p_input_line); 1123 p_line[i] = savestr(buf + 2); 1124 if (out_of_mem) { 1125 p_end = i - 1; 1126 return false; 1127 } 1128 p_len[i] = strlen(p_line[i]); 1129 p_char[i] = '+'; 1130 } 1131 1132 if (remove_special_line()) { 1133 p_len[i - 1] -= 1; 1134 (p_line[i - 1])[p_len[i - 1]] = 0; 1135 } 1136 } 1137 if (reverse) /* backwards patch? */ 1138 if (!pch_swap()) 1139 say("Not enough memory to swap next hunk!\n"); 1140 #ifdef DEBUGGING 1141 if (debug & 2) { 1142 int i; 1143 char special; 1144 1145 for (i = 0; i <= p_end; i++) { 1146 if (i == p_ptrn_lines) 1147 special = '^'; 1148 else 1149 special = ' '; 1150 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1151 special, p_line[i]); 1152 fflush(stderr); 1153 } 1154 } 1155 #endif 1156 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1157 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1158 return true; 1159 } 1160 1161 /* 1162 * Input a line from the patch file, worrying about indentation. 1163 */ 1164 char * 1165 pgets(char *bf, int sz, FILE *fp) 1166 { 1167 char *s, *ret = fgets(bf, sz, fp); 1168 int indent = 0; 1169 1170 if (p_indent && ret != NULL) { 1171 for (s = buf; 1172 indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X'); 1173 s++) { 1174 if (*s == '\t') 1175 indent += 8 - (indent % 7); 1176 else 1177 indent++; 1178 } 1179 if (buf != s && strlcpy(buf, s, sizeof(buf)) >= sizeof(buf)) 1180 fatal("buffer too small in pgets()\n"); 1181 } 1182 return ret; 1183 } 1184 1185 /* 1186 * Reverse the old and new portions of the current hunk. 1187 */ 1188 bool 1189 pch_swap(void) 1190 { 1191 char **tp_line; /* the text of the hunk */ 1192 short *tp_len; /* length of each line */ 1193 char *tp_char; /* +, -, and ! */ 1194 LINENUM i; 1195 LINENUM n; 1196 bool blankline = false; 1197 char *s; 1198 1199 i = p_first; 1200 p_first = p_newfirst; 1201 p_newfirst = i; 1202 1203 /* make a scratch copy */ 1204 1205 tp_line = p_line; 1206 tp_len = p_len; 1207 tp_char = p_char; 1208 p_line = NULL; /* force set_hunkmax to allocate again */ 1209 p_len = NULL; 1210 p_char = NULL; 1211 set_hunkmax(); 1212 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1213 1214 free(p_line); 1215 p_line = tp_line; 1216 free(p_len); 1217 p_len = tp_len; 1218 free(p_char); 1219 p_char = tp_char; 1220 return false; /* not enough memory to swap hunk! */ 1221 } 1222 /* now turn the new into the old */ 1223 1224 i = p_ptrn_lines + 1; 1225 if (tp_char[i] == '\n') { /* account for possible blank line */ 1226 blankline = true; 1227 i++; 1228 } 1229 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1230 if (p_efake <= i) 1231 n = p_end - i + 1; 1232 else 1233 n = -i; 1234 p_efake += n; 1235 p_bfake += n; 1236 } 1237 for (n = 0; i <= p_end; i++, n++) { 1238 p_line[n] = tp_line[i]; 1239 p_char[n] = tp_char[i]; 1240 if (p_char[n] == '+') 1241 p_char[n] = '-'; 1242 p_len[n] = tp_len[i]; 1243 } 1244 if (blankline) { 1245 i = p_ptrn_lines + 1; 1246 p_line[n] = tp_line[i]; 1247 p_char[n] = tp_char[i]; 1248 p_len[n] = tp_len[i]; 1249 n++; 1250 } 1251 if (p_char[0] != '=') 1252 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1253 p_input_line, p_char[0]); 1254 p_char[0] = '*'; 1255 for (s = p_line[0]; *s; s++) 1256 if (*s == '-') 1257 *s = '*'; 1258 1259 /* now turn the old into the new */ 1260 1261 if (p_char[0] != '*') 1262 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1263 p_input_line, p_char[0]); 1264 tp_char[0] = '='; 1265 for (s = tp_line[0]; *s; s++) 1266 if (*s == '*') 1267 *s = '-'; 1268 for (i = 0; n <= p_end; i++, n++) { 1269 p_line[n] = tp_line[i]; 1270 p_char[n] = tp_char[i]; 1271 if (p_char[n] == '-') 1272 p_char[n] = '+'; 1273 p_len[n] = tp_len[i]; 1274 } 1275 1276 if (i != p_ptrn_lines + 1) 1277 fatal("Malformed patch at line %ld: expected %ld lines, " 1278 "got %ld\n", 1279 p_input_line, p_ptrn_lines + 1, i); 1280 1281 i = p_ptrn_lines; 1282 p_ptrn_lines = p_repl_lines; 1283 p_repl_lines = i; 1284 1285 free(tp_line); 1286 free(tp_len); 1287 free(tp_char); 1288 1289 return true; 1290 } 1291 1292 /* 1293 * Return the specified line position in the old file of the old context. 1294 */ 1295 LINENUM 1296 pch_first(void) 1297 { 1298 return p_first; 1299 } 1300 1301 /* 1302 * Return the number of lines of old context. 1303 */ 1304 LINENUM 1305 pch_ptrn_lines(void) 1306 { 1307 return p_ptrn_lines; 1308 } 1309 1310 /* 1311 * Return the probable line position in the new file of the first line. 1312 */ 1313 LINENUM 1314 pch_newfirst(void) 1315 { 1316 return p_newfirst; 1317 } 1318 1319 /* 1320 * Return the number of lines in the replacement text including context. 1321 */ 1322 LINENUM 1323 pch_repl_lines(void) 1324 { 1325 return p_repl_lines; 1326 } 1327 1328 /* 1329 * Return the number of lines in the whole hunk. 1330 */ 1331 LINENUM 1332 pch_end(void) 1333 { 1334 return p_end; 1335 } 1336 1337 /* 1338 * Return the number of context lines before the first changed line. 1339 */ 1340 LINENUM 1341 pch_context(void) 1342 { 1343 return p_context; 1344 } 1345 1346 /* 1347 * Return the length of a particular patch line. 1348 */ 1349 short 1350 pch_line_len(LINENUM line) 1351 { 1352 return p_len[line]; 1353 } 1354 1355 /* 1356 * Return the control character (+, -, *, !, etc) for a patch line. 1357 */ 1358 char 1359 pch_char(LINENUM line) 1360 { 1361 return p_char[line]; 1362 } 1363 1364 /* 1365 * Return a pointer to a particular patch line. 1366 */ 1367 char * 1368 pfetch(LINENUM line) 1369 { 1370 return p_line[line]; 1371 } 1372 1373 /* 1374 * Return where in the patch file this hunk began, for error messages. 1375 */ 1376 LINENUM 1377 pch_hunk_beg(void) 1378 { 1379 return p_hunk_beg; 1380 } 1381 1382 /* 1383 * Choose the name of the file to be patched based on POSIX rules. 1384 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1385 * if the user specified --posix or set POSIXLY_CORRECT. 1386 */ 1387 static char * 1388 posix_name(const struct file_name *names, bool assume_exists) 1389 { 1390 char *path = NULL; 1391 int i; 1392 1393 /* 1394 * POSIX states that the filename will be chosen from one 1395 * of the old, new and index names (in that order) if 1396 * the file exists relative to CWD after -p stripping. 1397 */ 1398 for (i = 0; i < MAX_FILE; i++) { 1399 if (names[i].path != NULL && names[i].exists) { 1400 path = names[i].path; 1401 break; 1402 } 1403 } 1404 if (path == NULL && !assume_exists) { 1405 /* 1406 * No files found, check to see if the diff could be 1407 * creating a new file. 1408 */ 1409 if (path == NULL && ok_to_create_file && 1410 names[NEW_FILE].path != NULL) 1411 path = names[NEW_FILE].path; 1412 } 1413 1414 return path ? xstrdup(path) : NULL; 1415 } 1416 1417 static char * 1418 compare_names(const struct file_name *names, bool assume_exists) 1419 { 1420 size_t min_components, min_baselen, min_len, tmp; 1421 char *best = NULL; 1422 char *path; 1423 int i; 1424 1425 /* 1426 * The "best" name is the one with the fewest number of path 1427 * components, the shortest basename length, and the shortest 1428 * overall length (in that order). We only use the Index: file 1429 * if neither of the old or new files could be intuited from 1430 * the diff header. 1431 */ 1432 min_components = min_baselen = min_len = SIZE_MAX; 1433 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1434 path = names[i].path; 1435 if (path == NULL || (!names[i].exists && !assume_exists)) 1436 continue; 1437 if ((tmp = num_components(path)) > min_components) 1438 continue; 1439 if (tmp < min_components) { 1440 min_components = tmp; 1441 best = path; 1442 } 1443 if ((tmp = strlen(basename(path))) > min_baselen) 1444 continue; 1445 if (tmp < min_baselen) { 1446 min_baselen = tmp; 1447 best = path; 1448 } 1449 if ((tmp = strlen(path)) > min_len) 1450 continue; 1451 min_len = tmp; 1452 best = path; 1453 } 1454 return best; 1455 } 1456 1457 /* 1458 * Choose the name of the file to be patched based the "best" one 1459 * available. 1460 */ 1461 static char * 1462 best_name(const struct file_name *names, bool assume_exists) 1463 { 1464 char *best; 1465 1466 best = compare_names(names, assume_exists); 1467 1468 /* No match? Check to see if the diff could be creating a new file. */ 1469 if (best == NULL && ok_to_create_file) 1470 best = names[NEW_FILE].path; 1471 1472 return best ? xstrdup(best) : NULL; 1473 } 1474 1475 static size_t 1476 num_components(const char *path) 1477 { 1478 size_t n; 1479 const char *cp; 1480 1481 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1482 while (*cp == '/') 1483 cp++; /* skip consecutive slashes */ 1484 } 1485 return n; 1486 } 1487 1488 /* 1489 * Convert number at NPTR into LINENUM and save address of first 1490 * character that is not a digit in ENDPTR. If conversion is not 1491 * possible, call fatal. 1492 */ 1493 LINENUM 1494 strtolinenum(char *nptr, char **endptr) 1495 { 1496 LINENUM rv; 1497 char c; 1498 char *p; 1499 const char *errstr; 1500 1501 for (p = nptr; isdigit((unsigned char)*p); p++) 1502 ; 1503 1504 if (p == nptr) 1505 malformed(); 1506 1507 c = *p; 1508 *p = '\0'; 1509 1510 rv = strtonum(nptr, 0, LINENUM_MAX, &errstr); 1511 if (errstr != NULL) 1512 fatal("invalid line number at line %ld: `%s' is %s\n", 1513 p_input_line, nptr, errstr); 1514 1515 *p = c; 1516 *endptr = p; 1517 1518 return rv; 1519 } 1520