1 /* $OpenBSD: pch.c,v 1.60 2018/04/07 14:55:13 anton 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 45 /* Patch (diff listing) abstract type. */ 46 47 FILE *pfp = NULL; /* patch file pointer */ 48 LINENUM p_input_line = 0; /* current line # from patch file */ 49 50 static off_t 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 char **p_line = NULL;/* the text of the hunk */ 59 static short *p_len = NULL; /* length of each line */ 60 static char *p_char = NULL; /* +, -, and ! */ 61 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 62 static int p_indent; /* indent to patch */ 63 static off_t p_base; /* where to intuit this time */ 64 static LINENUM p_bline; /* line # of p_base */ 65 static off_t p_start; /* where intuit found a patch */ 66 static LINENUM p_sline; /* and the line number for it */ 67 static LINENUM p_hunk_beg; /* line number of current hunk */ 68 static LINENUM p_efake = -1; /* end of faked up lines--don't free */ 69 static LINENUM p_bfake = -1; /* beg of faked up lines */ 70 static char *bestguess = NULL; /* guess at correct filename */ 71 72 static void grow_hunkmax(void); 73 static int intuit_diff_type(void); 74 static void skip_to(off_t, LINENUM); 75 static char *best_name(const struct file_name *, bool); 76 static char *posix_name(const struct file_name *, bool); 77 static size_t num_components(const char *); 78 79 /* 80 * Prepare to look for the next patch in the patch file. 81 */ 82 void 83 re_patch(void) 84 { 85 p_first = 0; 86 p_newfirst = 0; 87 p_ptrn_lines = 0; 88 p_repl_lines = 0; 89 p_end = (LINENUM) - 1; 90 p_max = 0; 91 p_indent = 0; 92 } 93 94 /* 95 * Open the patch file at the beginning of time. 96 */ 97 void 98 open_patch_file(const char *filename) 99 { 100 struct stat filestat; 101 102 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 103 pfp = fopen(TMPPATNAME, "w"); 104 if (pfp == NULL) 105 pfatal("can't create %s", TMPPATNAME); 106 while (fgets(buf, sizeof buf, stdin) != NULL) 107 fputs(buf, pfp); 108 fclose(pfp); 109 filename = TMPPATNAME; 110 } 111 pfp = fopen(filename, "r"); 112 if (pfp == NULL) 113 pfatal("patch file %s not found", filename); 114 if (fstat(fileno(pfp), &filestat)) 115 pfatal("can't stat %s", filename); 116 p_filesize = filestat.st_size; 117 next_intuit_at(0, 1L); /* start at the beginning */ 118 set_hunkmax(); 119 } 120 121 /* 122 * Make sure our dynamically realloced tables are malloced to begin with. 123 */ 124 void 125 set_hunkmax(void) 126 { 127 if (p_line == NULL) 128 p_line = calloc((size_t) hunkmax, sizeof(char *)); 129 if (p_len == NULL) 130 p_len = calloc((size_t) hunkmax, sizeof(short)); 131 if (p_char == NULL) 132 p_char = calloc((size_t) hunkmax, sizeof(char)); 133 } 134 135 /* 136 * Enlarge the arrays containing the current hunk of patch. 137 */ 138 static void 139 grow_hunkmax(void) 140 { 141 int new_hunkmax; 142 char **new_p_line; 143 short *new_p_len; 144 char *new_p_char; 145 146 new_hunkmax = hunkmax * 2; 147 148 if (p_line == NULL || p_len == NULL || p_char == NULL) 149 fatal("Internal memory allocation error\n"); 150 151 new_p_line = reallocarray(p_line, new_hunkmax, sizeof(char *)); 152 if (new_p_line == NULL) 153 free(p_line); 154 155 new_p_len = reallocarray(p_len, new_hunkmax, sizeof(short)); 156 if (new_p_len == NULL) 157 free(p_len); 158 159 new_p_char = recallocarray(p_char, hunkmax, new_hunkmax, sizeof(char)); 160 if (new_p_char == NULL) 161 free(p_char); 162 163 p_char = new_p_char; 164 p_len = new_p_len; 165 p_line = new_p_line; 166 167 if (p_line != NULL && p_len != NULL && p_char != NULL) { 168 hunkmax = new_hunkmax; 169 return; 170 } 171 172 if (!using_plan_a) 173 fatal("out of memory\n"); 174 out_of_mem = true; /* whatever is null will be allocated again */ 175 /* from within plan_a(), of all places */ 176 } 177 178 /* True if the remainder of the patch file contains a diff of some sort. */ 179 180 bool 181 there_is_another_patch(void) 182 { 183 bool exists = false; 184 185 if (p_base != 0 && p_base >= p_filesize) { 186 if (verbose) 187 say("done\n"); 188 return false; 189 } 190 if (verbose) 191 say("Hmm..."); 192 diff_type = intuit_diff_type(); 193 if (!diff_type) { 194 if (p_base != 0) { 195 if (verbose) 196 say(" Ignoring the trailing garbage.\ndone\n"); 197 } else 198 say(" I can't seem to find a patch in there anywhere.\n"); 199 return false; 200 } 201 if (verbose) 202 say(" %sooks like %s to me...\n", 203 (p_base == 0 ? "L" : "The next patch l"), 204 diff_type == UNI_DIFF ? "a unified diff" : 205 diff_type == CONTEXT_DIFF ? "a context diff" : 206 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 207 diff_type == NORMAL_DIFF ? "a normal diff" : 208 "an ed script"); 209 if (p_indent && verbose) 210 say("(Patch is indented %d space%s.)\n", p_indent, 211 p_indent == 1 ? "" : "s"); 212 skip_to(p_start, p_sline); 213 while (filearg[0] == NULL) { 214 if (force || batch) { 215 say("No file to patch. Skipping...\n"); 216 filearg[0] = xstrdup(bestguess); 217 skip_rest_of_patch = true; 218 return true; 219 } 220 ask("File to patch: "); 221 if (*buf != '\n') { 222 free(bestguess); 223 bestguess = xstrdup(buf); 224 filearg[0] = fetchname(buf, &exists, 0); 225 } 226 if (!exists) { 227 int def_skip = *bestguess == '\0'; 228 ask("No file found--skip this patch? [%c] ", 229 def_skip ? 'y' : 'n'); 230 if (*buf == 'n' || (!def_skip && *buf != 'y')) 231 continue; 232 if (verbose) 233 say("Skipping patch...\n"); 234 free(filearg[0]); 235 filearg[0] = fetchname(bestguess, &exists, 0); 236 skip_rest_of_patch = true; 237 return true; 238 } 239 } 240 return true; 241 } 242 243 /* Determine what kind of diff is in the remaining part of the patch file. */ 244 245 static int 246 intuit_diff_type(void) 247 { 248 off_t this_line = 0, previous_line; 249 off_t first_command_line = -1; 250 LINENUM fcl_line = -1; 251 bool last_line_was_command = false, this_is_a_command = false; 252 bool stars_last_line = false, stars_this_line = false; 253 char *s, *t; 254 int indent, retval; 255 struct file_name names[MAX_FILE]; 256 int piece_of_git = 0; 257 258 memset(names, 0, sizeof(names)); 259 ok_to_create_file = false; 260 fseeko(pfp, p_base, SEEK_SET); 261 p_input_line = p_bline - 1; 262 for (;;) { 263 previous_line = this_line; 264 last_line_was_command = this_is_a_command; 265 stars_last_line = stars_this_line; 266 this_line = ftello(pfp); 267 indent = 0; 268 p_input_line++; 269 if (fgets(buf, sizeof buf, pfp) == NULL) { 270 if (first_command_line >= 0) { 271 /* nothing but deletes!? */ 272 p_start = first_command_line; 273 p_sline = fcl_line; 274 retval = ED_DIFF; 275 goto scan_exit; 276 } else { 277 p_start = this_line; 278 p_sline = p_input_line; 279 retval = 0; 280 goto scan_exit; 281 } 282 } 283 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 284 if (*s == '\t') 285 indent += 8 - (indent % 8); 286 else 287 indent++; 288 } 289 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 290 ; 291 this_is_a_command = (isdigit((unsigned char)*s) && 292 (*t == 'd' || *t == 'c' || *t == 'a')); 293 if (first_command_line < 0 && this_is_a_command) { 294 first_command_line = this_line; 295 fcl_line = p_input_line; 296 p_indent = indent; /* assume this for now */ 297 } 298 if (!stars_last_line && strnEQ(s, "*** ", 4)) 299 names[OLD_FILE].path = fetchname(s + 4, 300 &names[OLD_FILE].exists, strippath); 301 else if (strnEQ(s, "--- ", 4)) { 302 size_t off = 4; 303 if (piece_of_git && strippath == 957 && 304 strnEQ(s, "--- a/", 6)) 305 off = 6; 306 names[NEW_FILE].path = fetchname(s + off, 307 &names[NEW_FILE].exists, strippath); 308 } else if (strnEQ(s, "+++ ", 4)) { 309 /* pretend it is the old name */ 310 size_t off = 4; 311 if (piece_of_git && strippath == 957 && 312 strnEQ(s, "+++ b/", 6)) 313 off = 6; 314 names[OLD_FILE].path = fetchname(s + off, 315 &names[OLD_FILE].exists, strippath); 316 } else if (strnEQ(s, "Index:", 6)) 317 names[INDEX_FILE].path = fetchname(s + 6, 318 &names[INDEX_FILE].exists, strippath); 319 else if (strnEQ(s, "Prereq:", 7)) { 320 for (t = s + 7; isspace((unsigned char)*t); t++) 321 ; 322 revision = xstrdup(t); 323 for (t = revision; 324 *t && !isspace((unsigned char)*t); t++) 325 ; 326 *t = '\0'; 327 if (*revision == '\0') { 328 free(revision); 329 revision = NULL; 330 } 331 } else if (strnEQ(s, "diff --git a/", 13)) 332 piece_of_git = 1; 333 if ((!diff_type || diff_type == ED_DIFF) && 334 first_command_line >= 0 && 335 strEQ(s, ".\n")) { 336 p_indent = indent; 337 p_start = first_command_line; 338 p_sline = fcl_line; 339 retval = ED_DIFF; 340 goto scan_exit; 341 } 342 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 343 if (strnEQ(s + 4, "0,0", 3)) 344 ok_to_create_file = true; 345 p_indent = indent; 346 p_start = this_line; 347 p_sline = p_input_line; 348 retval = UNI_DIFF; 349 goto scan_exit; 350 } 351 stars_this_line = strnEQ(s, "********", 8); 352 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 353 strnEQ(s, "*** ", 4)) { 354 if (strtolinenum(s + 4, &s) == 0) 355 ok_to_create_file = true; 356 /* 357 * If this is a new context diff the character just 358 * at the end of the line is a '*'. 359 */ 360 while (*s && *s != '\n') 361 s++; 362 p_indent = indent; 363 p_start = previous_line; 364 p_sline = p_input_line - 1; 365 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 366 goto scan_exit; 367 } 368 if ((!diff_type || diff_type == NORMAL_DIFF) && 369 last_line_was_command && 370 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 371 p_start = previous_line; 372 p_sline = p_input_line - 1; 373 p_indent = indent; 374 retval = NORMAL_DIFF; 375 goto scan_exit; 376 } 377 } 378 scan_exit: 379 if (retval == UNI_DIFF) { 380 /* unswap old and new */ 381 struct file_name tmp = names[OLD_FILE]; 382 names[OLD_FILE] = names[NEW_FILE]; 383 names[NEW_FILE] = tmp; 384 } 385 if (filearg[0] == NULL) { 386 if (posix) 387 filearg[0] = posix_name(names, ok_to_create_file); 388 else { 389 /* Ignore the Index: name for context diffs, like GNU */ 390 if (names[OLD_FILE].path != NULL || 391 names[NEW_FILE].path != NULL) { 392 free(names[INDEX_FILE].path); 393 names[INDEX_FILE].path = NULL; 394 } 395 filearg[0] = best_name(names, ok_to_create_file); 396 } 397 } 398 399 free(bestguess); 400 bestguess = NULL; 401 if (filearg[0] != NULL) 402 bestguess = xstrdup(filearg[0]); 403 else if (!ok_to_create_file) { 404 /* 405 * We don't want to create a new file but we need a 406 * filename to set bestguess. Avoid setting filearg[0] 407 * so the file is not created automatically. 408 */ 409 if (posix) 410 bestguess = posix_name(names, true); 411 else 412 bestguess = best_name(names, true); 413 } 414 free(names[OLD_FILE].path); 415 free(names[NEW_FILE].path); 416 free(names[INDEX_FILE].path); 417 return retval; 418 } 419 420 /* 421 * Remember where this patch ends so we know where to start up again. 422 */ 423 void 424 next_intuit_at(off_t file_pos, LINENUM file_line) 425 { 426 p_base = file_pos; 427 p_bline = file_line; 428 } 429 430 /* 431 * Basically a verbose fseeko() to the actual diff listing. 432 */ 433 static void 434 skip_to(off_t file_pos, LINENUM file_line) 435 { 436 char *ret; 437 438 if (p_base > file_pos) 439 fatal("Internal error: seek %lld>%lld\n", 440 (long long)p_base, (long long)file_pos); 441 if (verbose && p_base < file_pos) { 442 fseeko(pfp, p_base, SEEK_SET); 443 say("The text leading up to this was:\n--------------------------\n"); 444 while (ftello(pfp) < file_pos) { 445 ret = fgets(buf, sizeof buf, pfp); 446 if (ret == NULL) 447 fatal("Unexpected end of file\n"); 448 say("|%s", buf); 449 } 450 say("--------------------------\n"); 451 } else 452 fseeko(pfp, file_pos, SEEK_SET); 453 p_input_line = file_line - 1; 454 } 455 456 /* Make this a function for better debugging. */ 457 static void 458 malformed(void) 459 { 460 fatal("malformed patch at line %ld: %s", p_input_line, buf); 461 /* about as informative as "Syntax error" in C */ 462 } 463 464 /* 465 * True if the line has been discarded (i.e. it is a line saying 466 * "\ No newline at end of file".) 467 */ 468 static bool 469 remove_special_line(void) 470 { 471 int c; 472 473 c = fgetc(pfp); 474 if (c == '\\') { 475 do { 476 c = fgetc(pfp); 477 } while (c != EOF && c != '\n'); 478 479 return true; 480 } 481 if (c != EOF) 482 fseeko(pfp, -1, SEEK_CUR); 483 484 return false; 485 } 486 487 /* 488 * True if there is more of the current diff listing to process. 489 */ 490 bool 491 another_hunk(void) 492 { 493 off_t line_beginning; /* file pos of the current line */ 494 LINENUM repl_beginning; /* index of --- line */ 495 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 496 LINENUM fillsrc; /* index of first line to copy */ 497 LINENUM filldst; /* index of first missing line */ 498 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 499 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 500 bool repl_missing; /* we are now backtracking */ 501 off_t repl_backtrack_position; /* file pos of first repl line */ 502 LINENUM repl_patch_line; /* input line number for same */ 503 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 504 char *s, *ret; 505 int context = 0; 506 507 while (p_end >= 0) { 508 if (p_end == p_efake) 509 p_end = p_bfake; /* don't free twice */ 510 else 511 free(p_line[p_end]); 512 p_end--; 513 } 514 p_efake = -1; 515 516 p_max = hunkmax; /* gets reduced when --- found */ 517 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 518 line_beginning = ftello(pfp); 519 repl_beginning = 0; 520 fillcnt = 0; 521 fillsrc = 0; 522 ptrn_spaces_eaten = false; 523 repl_could_be_missing = true; 524 repl_missing = false; 525 repl_backtrack_position = 0; 526 repl_patch_line = 0; 527 ptrn_copiable = 0; 528 529 ret = pgets(buf, sizeof buf, pfp); 530 p_input_line++; 531 if (ret == NULL || strnNE(buf, "********", 8)) { 532 next_intuit_at(line_beginning, p_input_line); 533 return false; 534 } 535 p_context = 100; 536 p_hunk_beg = p_input_line + 1; 537 while (p_end < p_max) { 538 line_beginning = ftello(pfp); 539 ret = pgets(buf, sizeof buf, pfp); 540 p_input_line++; 541 if (ret == NULL) { 542 if (p_max - p_end < 4) { 543 /* assume blank lines got chopped */ 544 strlcpy(buf, " \n", sizeof buf); 545 } else { 546 if (repl_beginning && repl_could_be_missing) { 547 repl_missing = true; 548 goto hunk_done; 549 } 550 fatal("unexpected end of file in patch\n"); 551 } 552 } 553 p_end++; 554 if (p_end >= hunkmax) 555 fatal("Internal error: hunk larger than hunk " 556 "buffer size"); 557 p_char[p_end] = *buf; 558 p_line[p_end] = NULL; 559 switch (*buf) { 560 case '*': 561 if (strnEQ(buf, "********", 8)) { 562 if (repl_beginning && repl_could_be_missing) { 563 repl_missing = true; 564 goto hunk_done; 565 } else 566 fatal("unexpected end of hunk " 567 "at line %ld\n", 568 p_input_line); 569 } 570 if (p_end != 0) { 571 if (repl_beginning && repl_could_be_missing) { 572 repl_missing = true; 573 goto hunk_done; 574 } 575 fatal("unexpected *** at line %ld: %s", 576 p_input_line, buf); 577 } 578 context = 0; 579 p_line[p_end] = savestr(buf); 580 if (out_of_mem) { 581 p_end--; 582 return false; 583 } 584 for (s = buf; 585 *s && !isdigit((unsigned char)*s); s++) 586 ; 587 if (!*s) 588 malformed(); 589 if (strnEQ(s, "0,0", 3)) 590 memmove(s, s + 2, strlen(s + 2) + 1); 591 p_first = strtolinenum(s, &s); 592 if (*s == ',') { 593 for (; *s && !isdigit((unsigned char)*s); s++) 594 ; 595 if (!*s) 596 malformed(); 597 p_ptrn_lines = strtolinenum(s, &s) - p_first + 1; 598 if (p_ptrn_lines < 0) 599 malformed(); 600 } else if (p_first) 601 p_ptrn_lines = 1; 602 else { 603 p_ptrn_lines = 0; 604 p_first = 1; 605 } 606 if (p_first >= LINENUM_MAX - p_ptrn_lines || 607 p_ptrn_lines >= LINENUM_MAX - 6) 608 malformed(); 609 610 /* we need this much at least */ 611 p_max = p_ptrn_lines + 6; 612 while (p_max >= hunkmax) 613 grow_hunkmax(); 614 p_max = hunkmax; 615 break; 616 case '-': 617 if (buf[1] == '-') { 618 if (repl_beginning || 619 (p_end != p_ptrn_lines + 1 + 620 (p_char[p_end - 1] == '\n'))) { 621 if (p_end == 1) { 622 /* 623 * `old' lines were omitted; 624 * set up to fill them in 625 * from 'new' context lines. 626 */ 627 p_end = p_ptrn_lines + 1; 628 fillsrc = p_end + 1; 629 filldst = 1; 630 fillcnt = p_ptrn_lines; 631 } else { 632 if (repl_beginning) { 633 if (repl_could_be_missing) { 634 repl_missing = true; 635 goto hunk_done; 636 } 637 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 638 p_input_line, p_hunk_beg + repl_beginning); 639 } else { 640 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 641 (p_end <= p_ptrn_lines 642 ? "Premature" 643 : "Overdue"), 644 p_input_line, p_hunk_beg); 645 } 646 } 647 } 648 repl_beginning = p_end; 649 repl_backtrack_position = ftello(pfp); 650 repl_patch_line = p_input_line; 651 p_line[p_end] = savestr(buf); 652 if (out_of_mem) { 653 p_end--; 654 return false; 655 } 656 p_char[p_end] = '='; 657 for (s = buf; 658 *s && !isdigit((unsigned char)*s); s++) 659 ; 660 if (!*s) 661 malformed(); 662 p_newfirst = strtolinenum(s, &s); 663 if (*s == ',') { 664 for (; *s && !isdigit((unsigned char)*s); s++) 665 ; 666 if (!*s) 667 malformed(); 668 p_repl_lines = strtolinenum(s, &s) - 669 p_newfirst + 1; 670 if (p_repl_lines < 0) 671 malformed(); 672 } else if (p_newfirst) 673 p_repl_lines = 1; 674 else { 675 p_repl_lines = 0; 676 p_newfirst = 1; 677 } 678 if (p_newfirst >= LINENUM_MAX - p_repl_lines || 679 p_repl_lines >= LINENUM_MAX - p_end) 680 malformed(); 681 p_max = p_repl_lines + p_end; 682 if (p_max > MAXHUNKSIZE) 683 fatal("hunk too large (%ld lines) at line %ld: %s", 684 p_max, p_input_line, buf); 685 while (p_max >= hunkmax) 686 grow_hunkmax(); 687 if (p_repl_lines != ptrn_copiable && 688 (p_context != 0 || p_repl_lines != 1)) 689 repl_could_be_missing = false; 690 break; 691 } 692 goto change_line; 693 case '+': 694 case '!': 695 repl_could_be_missing = false; 696 change_line: 697 if (buf[1] == '\n' && canonicalize) 698 strlcpy(buf + 1, " \n", sizeof buf - 1); 699 if (!isspace((unsigned char)buf[1]) && 700 buf[1] != '>' && buf[1] != '<' && 701 repl_beginning && repl_could_be_missing) { 702 repl_missing = true; 703 goto hunk_done; 704 } 705 if (context >= 0) { 706 if (context < p_context) 707 p_context = context; 708 context = -1000; 709 } 710 p_line[p_end] = savestr(buf + 2); 711 if (out_of_mem) { 712 p_end--; 713 return false; 714 } 715 if (p_end == p_ptrn_lines) { 716 if (remove_special_line()) { 717 int len; 718 719 len = strlen(p_line[p_end]) - 1; 720 (p_line[p_end])[len] = 0; 721 } 722 } 723 break; 724 case '\t': 725 case '\n': /* assume the 2 spaces got eaten */ 726 if (repl_beginning && repl_could_be_missing && 727 (!ptrn_spaces_eaten || 728 diff_type == NEW_CONTEXT_DIFF)) { 729 repl_missing = true; 730 goto hunk_done; 731 } 732 p_line[p_end] = savestr(buf); 733 if (out_of_mem) { 734 p_end--; 735 return false; 736 } 737 if (p_end != p_ptrn_lines + 1) { 738 ptrn_spaces_eaten |= (repl_beginning != 0); 739 context++; 740 if (!repl_beginning) 741 ptrn_copiable++; 742 p_char[p_end] = ' '; 743 } 744 break; 745 case ' ': 746 if (!isspace((unsigned char)buf[1]) && 747 repl_beginning && repl_could_be_missing) { 748 repl_missing = true; 749 goto hunk_done; 750 } 751 context++; 752 if (!repl_beginning) 753 ptrn_copiable++; 754 p_line[p_end] = savestr(buf + 2); 755 if (out_of_mem) { 756 p_end--; 757 return false; 758 } 759 break; 760 default: 761 if (repl_beginning && repl_could_be_missing) { 762 repl_missing = true; 763 goto hunk_done; 764 } 765 malformed(); 766 } 767 /* set up p_len for strncmp() so we don't have to */ 768 /* assume null termination */ 769 if (p_line[p_end]) 770 p_len[p_end] = strlen(p_line[p_end]); 771 else 772 p_len[p_end] = 0; 773 } 774 775 hunk_done: 776 if (p_end >= 0 && !repl_beginning) 777 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 778 779 if (repl_missing) { 780 781 /* reset state back to just after --- */ 782 p_input_line = repl_patch_line; 783 for (p_end--; p_end > repl_beginning; p_end--) 784 free(p_line[p_end]); 785 fseeko(pfp, repl_backtrack_position, SEEK_SET); 786 787 /* redundant 'new' context lines were omitted - set */ 788 /* up to fill them in from the old file context */ 789 if (!p_context && p_repl_lines == 1) { 790 p_repl_lines = 0; 791 p_max--; 792 } 793 fillsrc = 1; 794 filldst = repl_beginning + 1; 795 fillcnt = p_repl_lines; 796 p_end = p_max; 797 } else if (!p_context && fillcnt == 1) { 798 /* the first hunk was a null hunk with no context */ 799 /* and we were expecting one line -- fix it up. */ 800 while (filldst < p_end) { 801 p_line[filldst] = p_line[filldst + 1]; 802 p_char[filldst] = p_char[filldst + 1]; 803 p_len[filldst] = p_len[filldst + 1]; 804 filldst++; 805 } 806 #if 0 807 repl_beginning--; /* this doesn't need to be fixed */ 808 #endif 809 p_end--; 810 p_first++; /* do append rather than insert */ 811 fillcnt = 0; 812 p_ptrn_lines = 0; 813 } 814 if (diff_type == CONTEXT_DIFF && 815 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 816 if (verbose) 817 say("%s\n%s\n%s\n", 818 "(Fascinating--this is really a new-style context diff but without", 819 "the telltale extra asterisks on the *** line that usually indicate", 820 "the new style...)"); 821 diff_type = NEW_CONTEXT_DIFF; 822 } 823 /* if there were omitted context lines, fill them in now */ 824 if (fillcnt) { 825 p_bfake = filldst; /* remember where not to free() */ 826 p_efake = filldst + fillcnt - 1; 827 while (fillcnt-- > 0) { 828 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 829 fillsrc++; 830 if (fillsrc > p_end) 831 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 832 p_hunk_beg); 833 p_line[filldst] = p_line[fillsrc]; 834 p_char[filldst] = p_char[fillsrc]; 835 p_len[filldst] = p_len[fillsrc]; 836 fillsrc++; 837 filldst++; 838 } 839 while (fillsrc <= p_end && fillsrc != repl_beginning && 840 p_char[fillsrc] != ' ') 841 fillsrc++; 842 #ifdef DEBUGGING 843 if (debug & 64) 844 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 845 fillsrc, filldst, repl_beginning, p_end + 1); 846 #endif 847 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 848 malformed(); 849 if (filldst != p_end + 1 && filldst != repl_beginning) 850 malformed(); 851 } 852 if (p_line[p_end] != NULL) { 853 if (remove_special_line()) { 854 p_len[p_end] -= 1; 855 (p_line[p_end])[p_len[p_end]] = 0; 856 } 857 } 858 } else if (diff_type == UNI_DIFF) { 859 off_t line_beginning = ftello(pfp); /* file pos of the current line */ 860 LINENUM fillsrc; /* index of old lines */ 861 LINENUM filldst; /* index of new lines */ 862 char ch; 863 864 ret = pgets(buf, sizeof buf, pfp); 865 p_input_line++; 866 if (ret == NULL || strnNE(buf, "@@ -", 4)) { 867 next_intuit_at(line_beginning, p_input_line); 868 return false; 869 } 870 s = buf + 4; 871 if (!*s) 872 malformed(); 873 p_first = strtolinenum(s, &s); 874 if (*s == ',') { 875 p_ptrn_lines = strtolinenum(s + 1, &s); 876 } else 877 p_ptrn_lines = 1; 878 if (*s == ' ') 879 s++; 880 if (*s != '+' || !*++s) 881 malformed(); 882 p_newfirst = strtolinenum(s, &s); 883 if (*s == ',') { 884 p_repl_lines = strtolinenum(s + 1, &s); 885 } else 886 p_repl_lines = 1; 887 if (*s == ' ') 888 s++; 889 if (*s != '@') 890 malformed(); 891 if (p_first >= LINENUM_MAX - p_ptrn_lines || 892 p_newfirst > LINENUM_MAX - p_repl_lines || 893 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 894 malformed(); 895 if (!p_ptrn_lines) 896 p_first++; /* do append rather than insert */ 897 p_max = p_ptrn_lines + p_repl_lines + 1; 898 while (p_max >= hunkmax) 899 grow_hunkmax(); 900 fillsrc = 1; 901 filldst = fillsrc + p_ptrn_lines; 902 p_end = filldst + p_repl_lines; 903 snprintf(buf, sizeof buf, "*** %ld,%ld ****\n", p_first, 904 p_first + p_ptrn_lines - 1); 905 p_line[0] = savestr(buf); 906 if (out_of_mem) { 907 p_end = -1; 908 return false; 909 } 910 p_char[0] = '*'; 911 snprintf(buf, sizeof buf, "--- %ld,%ld ----\n", p_newfirst, 912 p_newfirst + p_repl_lines - 1); 913 p_line[filldst] = savestr(buf); 914 if (out_of_mem) { 915 p_end = 0; 916 return false; 917 } 918 p_char[filldst++] = '='; 919 p_context = 100; 920 context = 0; 921 p_hunk_beg = p_input_line + 1; 922 while (fillsrc <= p_ptrn_lines || filldst <= p_end) { 923 line_beginning = ftello(pfp); 924 ret = pgets(buf, sizeof buf, pfp); 925 p_input_line++; 926 if (ret == NULL) { 927 if (p_max - filldst < 3) { 928 /* assume blank lines got chopped */ 929 strlcpy(buf, " \n", sizeof buf); 930 } else { 931 fatal("unexpected end of file in patch\n"); 932 } 933 } 934 if (*buf == '\t' || *buf == '\n') { 935 ch = ' '; /* assume the space got eaten */ 936 s = savestr(buf); 937 } else { 938 ch = *buf; 939 s = savestr(buf + 1); 940 } 941 if (out_of_mem) { 942 while (--filldst > p_ptrn_lines) 943 free(p_line[filldst]); 944 p_end = fillsrc - 1; 945 return false; 946 } 947 switch (ch) { 948 case '-': 949 if (fillsrc > p_ptrn_lines) { 950 free(s); 951 p_end = filldst - 1; 952 malformed(); 953 } 954 p_char[fillsrc] = ch; 955 p_line[fillsrc] = s; 956 p_len[fillsrc++] = strlen(s); 957 if (fillsrc > p_ptrn_lines) { 958 if (remove_special_line()) { 959 p_len[fillsrc - 1] -= 1; 960 s[p_len[fillsrc - 1]] = 0; 961 } 962 } 963 break; 964 case '=': 965 ch = ' '; 966 /* FALL THROUGH */ 967 case ' ': 968 if (fillsrc > p_ptrn_lines) { 969 free(s); 970 while (--filldst > p_ptrn_lines) 971 free(p_line[filldst]); 972 p_end = fillsrc - 1; 973 malformed(); 974 } 975 context++; 976 p_char[fillsrc] = ch; 977 p_line[fillsrc] = s; 978 p_len[fillsrc++] = strlen(s); 979 s = savestr(s); 980 if (out_of_mem) { 981 while (--filldst > p_ptrn_lines) 982 free(p_line[filldst]); 983 p_end = fillsrc - 1; 984 return false; 985 } 986 if (fillsrc > p_ptrn_lines) { 987 if (remove_special_line()) { 988 p_len[fillsrc - 1] -= 1; 989 s[p_len[fillsrc - 1]] = 0; 990 } 991 } 992 /* FALL THROUGH */ 993 case '+': 994 if (filldst > p_end) { 995 free(s); 996 while (--filldst > p_ptrn_lines) 997 free(p_line[filldst]); 998 p_end = fillsrc - 1; 999 malformed(); 1000 } 1001 p_char[filldst] = ch; 1002 p_line[filldst] = s; 1003 p_len[filldst++] = strlen(s); 1004 if (fillsrc > p_ptrn_lines) { 1005 if (remove_special_line()) { 1006 p_len[filldst - 1] -= 1; 1007 s[p_len[filldst - 1]] = 0; 1008 } 1009 } 1010 break; 1011 default: 1012 p_end = filldst; 1013 malformed(); 1014 } 1015 if (ch != ' ' && context > 0) { 1016 if (context < p_context) 1017 p_context = context; 1018 context = -1000; 1019 } 1020 } /* while */ 1021 } else { /* normal diff--fake it up */ 1022 char hunk_type; 1023 int i; 1024 LINENUM min, max; 1025 off_t line_beginning = ftello(pfp); 1026 1027 p_context = 0; 1028 ret = pgets(buf, sizeof buf, pfp); 1029 p_input_line++; 1030 if (ret == NULL || !isdigit((unsigned char)*buf)) { 1031 next_intuit_at(line_beginning, p_input_line); 1032 return false; 1033 } 1034 p_first = strtolinenum(buf, &s); 1035 if (*s == ',') { 1036 p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1; 1037 if (p_ptrn_lines < 0) 1038 malformed(); 1039 } else 1040 p_ptrn_lines = (*s != 'a'); 1041 if (p_first >= LINENUM_MAX - p_ptrn_lines) 1042 malformed(); 1043 hunk_type = *s; 1044 if (hunk_type == 'a') 1045 p_first++; /* do append rather than insert */ 1046 min = strtolinenum(s + 1, &s); 1047 if (*s == ',') 1048 max = strtolinenum(s + 1, &s); 1049 else 1050 max = min; 1051 if (min < 0 || min > max || max - min == LINENUM_MAX) 1052 malformed(); 1053 if (hunk_type == 'd') 1054 min++; 1055 p_newfirst = min; 1056 p_repl_lines = max - min + 1; 1057 if (p_newfirst > LINENUM_MAX - p_repl_lines || 1058 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1059 malformed(); 1060 p_end = p_ptrn_lines + p_repl_lines + 1; 1061 if (p_end > MAXHUNKSIZE) 1062 fatal("hunk too large (%ld lines) at line %ld: %s", 1063 p_end, p_input_line, buf); 1064 while (p_end >= hunkmax) 1065 grow_hunkmax(); 1066 snprintf(buf, sizeof buf, "*** %ld,%ld\n", p_first, 1067 p_first + p_ptrn_lines - 1); 1068 p_line[0] = savestr(buf); 1069 if (out_of_mem) { 1070 p_end = -1; 1071 return false; 1072 } 1073 p_char[0] = '*'; 1074 for (i = 1; i <= p_ptrn_lines; i++) { 1075 ret = pgets(buf, sizeof buf, pfp); 1076 p_input_line++; 1077 if (ret == NULL) 1078 fatal("unexpected end of file in patch at line %ld\n", 1079 p_input_line); 1080 if (*buf != '<') 1081 fatal("< expected at line %ld of patch\n", 1082 p_input_line); 1083 p_line[i] = savestr(buf + 2); 1084 if (out_of_mem) { 1085 p_end = i - 1; 1086 return false; 1087 } 1088 p_len[i] = strlen(p_line[i]); 1089 p_char[i] = '-'; 1090 } 1091 1092 if (remove_special_line()) { 1093 p_len[i - 1] -= 1; 1094 (p_line[i - 1])[p_len[i - 1]] = 0; 1095 } 1096 if (hunk_type == 'c') { 1097 ret = pgets(buf, sizeof buf, pfp); 1098 p_input_line++; 1099 if (ret == NULL) 1100 fatal("unexpected end of file in patch at line %ld\n", 1101 p_input_line); 1102 if (*buf != '-') 1103 fatal("--- expected at line %ld of patch\n", 1104 p_input_line); 1105 } 1106 snprintf(buf, sizeof(buf), "--- %ld,%ld\n", min, max); 1107 p_line[i] = savestr(buf); 1108 if (out_of_mem) { 1109 p_end = i - 1; 1110 return false; 1111 } 1112 p_char[i] = '='; 1113 for (i++; i <= p_end; i++) { 1114 ret = pgets(buf, sizeof buf, pfp); 1115 p_input_line++; 1116 if (ret == NULL) 1117 fatal("unexpected end of file in patch at line %ld\n", 1118 p_input_line); 1119 if (*buf != '>') 1120 fatal("> expected at line %ld of patch\n", 1121 p_input_line); 1122 p_line[i] = savestr(buf + 2); 1123 if (out_of_mem) { 1124 p_end = i - 1; 1125 return false; 1126 } 1127 p_len[i] = strlen(p_line[i]); 1128 p_char[i] = '+'; 1129 } 1130 1131 if (remove_special_line()) { 1132 p_len[i - 1] -= 1; 1133 (p_line[i - 1])[p_len[i - 1]] = 0; 1134 } 1135 } 1136 if (reverse) /* backwards patch? */ 1137 if (!pch_swap()) 1138 say("Not enough memory to swap next hunk!\n"); 1139 #ifdef DEBUGGING 1140 if (debug & 2) { 1141 int i; 1142 char special; 1143 1144 for (i = 0; i <= p_end; i++) { 1145 if (i == p_ptrn_lines) 1146 special = '^'; 1147 else 1148 special = ' '; 1149 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1150 special, p_line[i]); 1151 fflush(stderr); 1152 } 1153 } 1154 #endif 1155 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1156 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1157 return true; 1158 } 1159 1160 /* 1161 * Input a line from the patch file, worrying about indentation. 1162 */ 1163 char * 1164 pgets(char *bf, int sz, FILE *fp) 1165 { 1166 char *s, *ret = fgets(bf, sz, fp); 1167 int indent = 0; 1168 1169 if (p_indent && ret != NULL) { 1170 for (s = buf; 1171 indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X'); 1172 s++) { 1173 if (*s == '\t') 1174 indent += 8 - (indent % 7); 1175 else 1176 indent++; 1177 } 1178 if (buf != s && strlcpy(buf, s, sizeof(buf)) >= sizeof(buf)) 1179 fatal("buffer too small in pgets()\n"); 1180 } 1181 return ret; 1182 } 1183 1184 /* 1185 * Reverse the old and new portions of the current hunk. 1186 */ 1187 bool 1188 pch_swap(void) 1189 { 1190 char **tp_line; /* the text of the hunk */ 1191 short *tp_len; /* length of each line */ 1192 char *tp_char; /* +, -, and ! */ 1193 LINENUM i; 1194 LINENUM n; 1195 bool blankline = false; 1196 char *s; 1197 1198 i = p_first; 1199 p_first = p_newfirst; 1200 p_newfirst = i; 1201 1202 /* make a scratch copy */ 1203 1204 tp_line = p_line; 1205 tp_len = p_len; 1206 tp_char = p_char; 1207 p_line = NULL; /* force set_hunkmax to allocate again */ 1208 p_len = NULL; 1209 p_char = NULL; 1210 set_hunkmax(); 1211 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1212 1213 free(p_line); 1214 p_line = tp_line; 1215 free(p_len); 1216 p_len = tp_len; 1217 free(p_char); 1218 p_char = tp_char; 1219 return false; /* not enough memory to swap hunk! */ 1220 } 1221 /* now turn the new into the old */ 1222 1223 i = p_ptrn_lines + 1; 1224 if (tp_char[i] == '\n') { /* account for possible blank line */ 1225 blankline = true; 1226 i++; 1227 } 1228 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1229 if (p_efake <= i) 1230 n = p_end - i + 1; 1231 else 1232 n = -i; 1233 p_efake += n; 1234 p_bfake += n; 1235 } 1236 for (n = 0; i <= p_end; i++, n++) { 1237 p_line[n] = tp_line[i]; 1238 p_char[n] = tp_char[i]; 1239 if (p_char[n] == '+') 1240 p_char[n] = '-'; 1241 p_len[n] = tp_len[i]; 1242 } 1243 if (blankline) { 1244 i = p_ptrn_lines + 1; 1245 p_line[n] = tp_line[i]; 1246 p_char[n] = tp_char[i]; 1247 p_len[n] = tp_len[i]; 1248 n++; 1249 } 1250 if (p_char[0] != '=') 1251 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1252 p_input_line, p_char[0]); 1253 p_char[0] = '*'; 1254 for (s = p_line[0]; *s; s++) 1255 if (*s == '-') 1256 *s = '*'; 1257 1258 /* now turn the old into the new */ 1259 1260 if (p_char[0] != '*') 1261 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1262 p_input_line, p_char[0]); 1263 tp_char[0] = '='; 1264 for (s = tp_line[0]; *s; s++) 1265 if (*s == '*') 1266 *s = '-'; 1267 for (i = 0; n <= p_end; i++, n++) { 1268 p_line[n] = tp_line[i]; 1269 p_char[n] = tp_char[i]; 1270 if (p_char[n] == '-') 1271 p_char[n] = '+'; 1272 p_len[n] = tp_len[i]; 1273 } 1274 1275 if (i != p_ptrn_lines + 1) 1276 fatal("Malformed patch at line %ld: expected %ld lines, " 1277 "got %ld\n", 1278 p_input_line, p_ptrn_lines + 1, i); 1279 1280 i = p_ptrn_lines; 1281 p_ptrn_lines = p_repl_lines; 1282 p_repl_lines = i; 1283 1284 free(tp_line); 1285 free(tp_len); 1286 free(tp_char); 1287 1288 return true; 1289 } 1290 1291 /* 1292 * Return the specified line position in the old file of the old context. 1293 */ 1294 LINENUM 1295 pch_first(void) 1296 { 1297 return p_first; 1298 } 1299 1300 /* 1301 * Return the number of lines of old context. 1302 */ 1303 LINENUM 1304 pch_ptrn_lines(void) 1305 { 1306 return p_ptrn_lines; 1307 } 1308 1309 /* 1310 * Return the probable line position in the new file of the first line. 1311 */ 1312 LINENUM 1313 pch_newfirst(void) 1314 { 1315 return p_newfirst; 1316 } 1317 1318 /* 1319 * Return the number of lines in the replacement text including context. 1320 */ 1321 LINENUM 1322 pch_repl_lines(void) 1323 { 1324 return p_repl_lines; 1325 } 1326 1327 /* 1328 * Return the number of lines in the whole hunk. 1329 */ 1330 LINENUM 1331 pch_end(void) 1332 { 1333 return p_end; 1334 } 1335 1336 /* 1337 * Return the number of context lines before the first changed line. 1338 */ 1339 LINENUM 1340 pch_context(void) 1341 { 1342 return p_context; 1343 } 1344 1345 /* 1346 * Return the length of a particular patch line. 1347 */ 1348 short 1349 pch_line_len(LINENUM line) 1350 { 1351 return p_len[line]; 1352 } 1353 1354 /* 1355 * Return the control character (+, -, *, !, etc) for a patch line. 1356 */ 1357 char 1358 pch_char(LINENUM line) 1359 { 1360 return p_char[line]; 1361 } 1362 1363 /* 1364 * Return a pointer to a particular patch line. 1365 */ 1366 char * 1367 pfetch(LINENUM line) 1368 { 1369 return p_line[line]; 1370 } 1371 1372 /* 1373 * Return where in the patch file this hunk began, for error messages. 1374 */ 1375 LINENUM 1376 pch_hunk_beg(void) 1377 { 1378 return p_hunk_beg; 1379 } 1380 1381 /* 1382 * Choose the name of the file to be patched based on POSIX rules. 1383 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1384 * if the user specified --posix or set POSIXLY_CORRECT. 1385 */ 1386 static char * 1387 posix_name(const struct file_name *names, bool assume_exists) 1388 { 1389 char *path = NULL; 1390 int i; 1391 1392 /* 1393 * POSIX states that the filename will be chosen from one 1394 * of the old, new and index names (in that order) if 1395 * the file exists relative to CWD after -p stripping. 1396 */ 1397 for (i = 0; i < MAX_FILE; i++) { 1398 if (names[i].path != NULL && names[i].exists) { 1399 path = names[i].path; 1400 break; 1401 } 1402 } 1403 if (path == NULL && !assume_exists) { 1404 /* 1405 * No files found, check to see if the diff could be 1406 * creating a new file. 1407 */ 1408 if (path == NULL && ok_to_create_file && 1409 names[NEW_FILE].path != NULL) 1410 path = names[NEW_FILE].path; 1411 } 1412 1413 return path ? xstrdup(path) : NULL; 1414 } 1415 1416 static char * 1417 compare_names(const struct file_name *names, bool assume_exists) 1418 { 1419 size_t min_components, min_baselen, min_len, tmp; 1420 char *best = NULL; 1421 char *path; 1422 int i; 1423 1424 /* 1425 * The "best" name is the one with the fewest number of path 1426 * components, the shortest basename length, and the shortest 1427 * overall length (in that order). We only use the Index: file 1428 * if neither of the old or new files could be intuited from 1429 * the diff header. 1430 */ 1431 min_components = min_baselen = min_len = SIZE_MAX; 1432 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1433 path = names[i].path; 1434 if (path == NULL || (!names[i].exists && !assume_exists)) 1435 continue; 1436 if ((tmp = num_components(path)) > min_components) 1437 continue; 1438 if (tmp < min_components) { 1439 min_components = tmp; 1440 best = path; 1441 } 1442 if ((tmp = strlen(basename(path))) > min_baselen) 1443 continue; 1444 if (tmp < min_baselen) { 1445 min_baselen = tmp; 1446 best = path; 1447 } 1448 if ((tmp = strlen(path)) > min_len) 1449 continue; 1450 min_len = tmp; 1451 best = path; 1452 } 1453 return best; 1454 } 1455 1456 /* 1457 * Choose the name of the file to be patched based the "best" one 1458 * available. 1459 */ 1460 static char * 1461 best_name(const struct file_name *names, bool assume_exists) 1462 { 1463 char *best; 1464 1465 best = compare_names(names, assume_exists); 1466 1467 /* No match? Check to see if the diff could be creating a new file. */ 1468 if (best == NULL && ok_to_create_file) 1469 best = names[NEW_FILE].path; 1470 1471 return best ? xstrdup(best) : NULL; 1472 } 1473 1474 static size_t 1475 num_components(const char *path) 1476 { 1477 size_t n; 1478 const char *cp; 1479 1480 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1481 while (*cp == '/') 1482 cp++; /* skip consecutive slashes */ 1483 } 1484 return n; 1485 } 1486 1487 /* 1488 * Convert number at NPTR into LINENUM and save address of first 1489 * character that is not a digit in ENDPTR. If conversion is not 1490 * possible, call fatal. 1491 */ 1492 LINENUM 1493 strtolinenum(char *nptr, char **endptr) 1494 { 1495 LINENUM rv; 1496 char c; 1497 char *p; 1498 const char *errstr; 1499 1500 for (p = nptr; isdigit((unsigned char)*p); p++) 1501 ; 1502 1503 if (p == nptr) 1504 malformed(); 1505 1506 c = *p; 1507 *p = '\0'; 1508 1509 rv = strtonum(nptr, 0, LINENUM_MAX, &errstr); 1510 if (errstr != NULL) 1511 fatal("invalid line number at line %ld: `%s' is %s\n", 1512 p_input_line, nptr, errstr); 1513 1514 *p = c; 1515 *endptr = p; 1516 1517 return rv; 1518 } 1519