1 /* $OpenBSD: pch.c,v 1.62 2019/12/02 22:23:19 jca 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 (getline(&buf, &bufsz, stdin) != -1) 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 (getline(&buf, &bufsz, pfp) == -1) { 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 int 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 = getline(&buf, &bufsz, pfp); 446 if (ret == -1) 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; 505 int context = 0; 506 int ret; 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 = pgetline(&buf, &bufsz, pfp); 531 p_input_line++; 532 if (ret == -1 || 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 = pgetline(&buf, &bufsz, pfp); 541 p_input_line++; 542 if (ret == -1) { 543 if (p_max - p_end < 4) { 544 /* assume blank lines got chopped */ 545 strlcpy(buf, " \n", bufsz); 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", bufsz - 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 = pgetline(&buf, &bufsz, pfp); 866 p_input_line++; 867 if (ret == -1 || 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, bufsz, "*** %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, bufsz, "--- %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 = pgetline(&buf, &bufsz, pfp); 926 p_input_line++; 927 if (ret == -1) { 928 if (p_max - filldst < 3) { 929 /* assume blank lines got chopped */ 930 strlcpy(buf, " \n", bufsz); 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 = pgetline(&buf, &bufsz, pfp); 1030 p_input_line++; 1031 if (ret == -1 || !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, bufsz, "*** %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 = pgetline(&buf, &bufsz, pfp); 1077 p_input_line++; 1078 if (ret == -1) 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 = pgetline(&buf, &bufsz, pfp); 1099 p_input_line++; 1100 if (ret == -1) 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, bufsz, "--- %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 = pgetline(&buf, &bufsz, pfp); 1116 p_input_line++; 1117 if (ret == -1) 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 int 1165 pgetline(char **bf, size_t *sz, FILE *fp) 1166 { 1167 char *s; 1168 int indent = 0; 1169 int ret; 1170 1171 ret = getline(bf, sz, fp); 1172 1173 if (p_indent && ret != -1) { 1174 for (s = buf; 1175 indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X'); 1176 s++) { 1177 if (*s == '\t') 1178 indent += 8 - (indent % 7); 1179 else 1180 indent++; 1181 } 1182 if (buf != s && strlcpy(buf, s, bufsz) >= bufsz) 1183 fatal("buffer too small in pgetline()\n"); 1184 } 1185 return ret; 1186 } 1187 1188 /* 1189 * Reverse the old and new portions of the current hunk. 1190 */ 1191 bool 1192 pch_swap(void) 1193 { 1194 char **tp_line; /* the text of the hunk */ 1195 short *tp_len; /* length of each line */ 1196 char *tp_char; /* +, -, and ! */ 1197 LINENUM i; 1198 LINENUM n; 1199 bool blankline = false; 1200 char *s; 1201 1202 i = p_first; 1203 p_first = p_newfirst; 1204 p_newfirst = i; 1205 1206 /* make a scratch copy */ 1207 1208 tp_line = p_line; 1209 tp_len = p_len; 1210 tp_char = p_char; 1211 p_line = NULL; /* force set_hunkmax to allocate again */ 1212 p_len = NULL; 1213 p_char = NULL; 1214 set_hunkmax(); 1215 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1216 1217 free(p_line); 1218 p_line = tp_line; 1219 free(p_len); 1220 p_len = tp_len; 1221 free(p_char); 1222 p_char = tp_char; 1223 return false; /* not enough memory to swap hunk! */ 1224 } 1225 /* now turn the new into the old */ 1226 1227 i = p_ptrn_lines + 1; 1228 if (tp_char[i] == '\n') { /* account for possible blank line */ 1229 blankline = true; 1230 i++; 1231 } 1232 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1233 if (p_efake <= i) 1234 n = p_end - i + 1; 1235 else 1236 n = -i; 1237 p_efake += n; 1238 p_bfake += n; 1239 } 1240 for (n = 0; i <= p_end; i++, n++) { 1241 p_line[n] = tp_line[i]; 1242 p_char[n] = tp_char[i]; 1243 if (p_char[n] == '+') 1244 p_char[n] = '-'; 1245 p_len[n] = tp_len[i]; 1246 } 1247 if (blankline) { 1248 i = p_ptrn_lines + 1; 1249 p_line[n] = tp_line[i]; 1250 p_char[n] = tp_char[i]; 1251 p_len[n] = tp_len[i]; 1252 n++; 1253 } 1254 if (p_char[0] != '=') 1255 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1256 p_input_line, p_char[0]); 1257 p_char[0] = '*'; 1258 for (s = p_line[0]; *s; s++) 1259 if (*s == '-') 1260 *s = '*'; 1261 1262 /* now turn the old into the new */ 1263 1264 if (p_char[0] != '*') 1265 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1266 p_input_line, p_char[0]); 1267 tp_char[0] = '='; 1268 for (s = tp_line[0]; *s; s++) 1269 if (*s == '*') 1270 *s = '-'; 1271 for (i = 0; n <= p_end; i++, n++) { 1272 p_line[n] = tp_line[i]; 1273 p_char[n] = tp_char[i]; 1274 if (p_char[n] == '-') 1275 p_char[n] = '+'; 1276 p_len[n] = tp_len[i]; 1277 } 1278 1279 if (i != p_ptrn_lines + 1) 1280 fatal("Malformed patch at line %ld: expected %ld lines, " 1281 "got %ld\n", 1282 p_input_line, p_ptrn_lines + 1, i); 1283 1284 i = p_ptrn_lines; 1285 p_ptrn_lines = p_repl_lines; 1286 p_repl_lines = i; 1287 1288 free(tp_line); 1289 free(tp_len); 1290 free(tp_char); 1291 1292 return true; 1293 } 1294 1295 /* 1296 * Return the specified line position in the old file of the old context. 1297 */ 1298 LINENUM 1299 pch_first(void) 1300 { 1301 return p_first; 1302 } 1303 1304 /* 1305 * Return the number of lines of old context. 1306 */ 1307 LINENUM 1308 pch_ptrn_lines(void) 1309 { 1310 return p_ptrn_lines; 1311 } 1312 1313 /* 1314 * Return the probable line position in the new file of the first line. 1315 */ 1316 LINENUM 1317 pch_newfirst(void) 1318 { 1319 return p_newfirst; 1320 } 1321 1322 /* 1323 * Return the number of lines in the replacement text including context. 1324 */ 1325 LINENUM 1326 pch_repl_lines(void) 1327 { 1328 return p_repl_lines; 1329 } 1330 1331 /* 1332 * Return the number of lines in the whole hunk. 1333 */ 1334 LINENUM 1335 pch_end(void) 1336 { 1337 return p_end; 1338 } 1339 1340 /* 1341 * Return the number of context lines before the first changed line. 1342 */ 1343 LINENUM 1344 pch_context(void) 1345 { 1346 return p_context; 1347 } 1348 1349 /* 1350 * Return the length of a particular patch line. 1351 */ 1352 short 1353 pch_line_len(LINENUM line) 1354 { 1355 return p_len[line]; 1356 } 1357 1358 /* 1359 * Return the control character (+, -, *, !, etc) for a patch line. 1360 */ 1361 char 1362 pch_char(LINENUM line) 1363 { 1364 return p_char[line]; 1365 } 1366 1367 /* 1368 * Return a pointer to a particular patch line. 1369 */ 1370 char * 1371 pfetch(LINENUM line) 1372 { 1373 return p_line[line]; 1374 } 1375 1376 /* 1377 * Return where in the patch file this hunk began, for error messages. 1378 */ 1379 LINENUM 1380 pch_hunk_beg(void) 1381 { 1382 return p_hunk_beg; 1383 } 1384 1385 /* 1386 * Choose the name of the file to be patched based on POSIX rules. 1387 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1388 * if the user specified --posix or set POSIXLY_CORRECT. 1389 */ 1390 static char * 1391 posix_name(const struct file_name *names, bool assume_exists) 1392 { 1393 char *path = NULL; 1394 int i; 1395 1396 /* 1397 * POSIX states that the filename will be chosen from one 1398 * of the old, new and index names (in that order) if 1399 * the file exists relative to CWD after -p stripping. 1400 */ 1401 for (i = 0; i < MAX_FILE; i++) { 1402 if (names[i].path != NULL && names[i].exists) { 1403 path = names[i].path; 1404 break; 1405 } 1406 } 1407 if (path == NULL && !assume_exists) { 1408 /* 1409 * No files found, check to see if the diff could be 1410 * creating a new file. 1411 */ 1412 if (path == NULL && ok_to_create_file && 1413 names[NEW_FILE].path != NULL) 1414 path = names[NEW_FILE].path; 1415 } 1416 1417 return path ? xstrdup(path) : NULL; 1418 } 1419 1420 static char * 1421 compare_names(const struct file_name *names, bool assume_exists) 1422 { 1423 size_t min_components, min_baselen, min_len, tmp; 1424 char *best = NULL; 1425 char *path; 1426 int i; 1427 1428 /* 1429 * The "best" name is the one with the fewest number of path 1430 * components, the shortest basename length, and the shortest 1431 * overall length (in that order). We only use the Index: file 1432 * if neither of the old or new files could be intuited from 1433 * the diff header. 1434 */ 1435 min_components = min_baselen = min_len = SIZE_MAX; 1436 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1437 path = names[i].path; 1438 if (path == NULL || (!names[i].exists && !assume_exists)) 1439 continue; 1440 if ((tmp = num_components(path)) > min_components) 1441 continue; 1442 if (tmp < min_components) { 1443 min_components = tmp; 1444 best = path; 1445 } 1446 if ((tmp = strlen(basename(path))) > min_baselen) 1447 continue; 1448 if (tmp < min_baselen) { 1449 min_baselen = tmp; 1450 best = path; 1451 } 1452 if ((tmp = strlen(path)) > min_len) 1453 continue; 1454 min_len = tmp; 1455 best = path; 1456 } 1457 return best; 1458 } 1459 1460 /* 1461 * Choose the name of the file to be patched based the "best" one 1462 * available. 1463 */ 1464 static char * 1465 best_name(const struct file_name *names, bool assume_exists) 1466 { 1467 char *best; 1468 1469 best = compare_names(names, assume_exists); 1470 1471 /* No match? Check to see if the diff could be creating a new file. */ 1472 if (best == NULL && ok_to_create_file) 1473 best = names[NEW_FILE].path; 1474 1475 return best ? xstrdup(best) : NULL; 1476 } 1477 1478 static size_t 1479 num_components(const char *path) 1480 { 1481 size_t n; 1482 const char *cp; 1483 1484 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1485 while (*cp == '/') 1486 cp++; /* skip consecutive slashes */ 1487 } 1488 return n; 1489 } 1490 1491 /* 1492 * Convert number at NPTR into LINENUM and save address of first 1493 * character that is not a digit in ENDPTR. If conversion is not 1494 * possible, call fatal. 1495 */ 1496 LINENUM 1497 strtolinenum(char *nptr, char **endptr) 1498 { 1499 LINENUM rv; 1500 char c; 1501 char *p; 1502 const char *errstr; 1503 1504 for (p = nptr; isdigit((unsigned char)*p); p++) 1505 ; 1506 1507 if (p == nptr) 1508 malformed(); 1509 1510 c = *p; 1511 *p = '\0'; 1512 1513 rv = strtonum(nptr, 0, LINENUM_MAX, &errstr); 1514 if (errstr != NULL) 1515 fatal("invalid line number at line %ld: `%s' is %s\n", 1516 p_input_line, nptr, errstr); 1517 1518 *p = c; 1519 *endptr = p; 1520 1521 return rv; 1522 } 1523