1 /*- 2 * Copyright 1986, Larry Wall 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following condition is met: 6 * 1. Redistributions of source code must retain the above copyright notice, 7 * this condition and the following disclaimer. 8 * 9 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 10 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 11 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 12 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 13 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 14 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 15 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 16 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 17 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 18 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 19 * SUCH DAMAGE. 20 * 21 * patch - a program to apply diffs to original files 22 * 23 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 24 * behaviour 25 * 26 * $OpenBSD: pch.c,v 1.43 2014/11/18 17:03:35 tobias Exp $ 27 * $FreeBSD$ 28 */ 29 30 #include <sys/types.h> 31 #include <sys/stat.h> 32 33 #include <ctype.h> 34 #include <libgen.h> 35 #include <limits.h> 36 #include <stdint.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 #include "common.h" 43 #include "util.h" 44 #include "pch.h" 45 #include "pathnames.h" 46 47 /* Patch (diff listing) abstract type. */ 48 49 static off_t p_filesize; /* size of the patch file */ 50 static LINENUM p_first; /* 1st line number */ 51 static LINENUM p_newfirst; /* 1st line number of replacement */ 52 static LINENUM p_ptrn_lines; /* # lines in pattern */ 53 static LINENUM p_repl_lines; /* # lines in replacement text */ 54 static LINENUM p_end = -1; /* last line in hunk */ 55 static LINENUM p_max; /* max allowed value of p_end */ 56 static LINENUM p_context = 3; /* # of context lines */ 57 static LINENUM p_input_line = 0; /* current line # from patch file */ 58 static char **p_line = NULL;/* the text of the hunk */ 59 static unsigned 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 FILE *pfp = NULL; /* patch file pointer */ 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 next_intuit_at(off_t, LINENUM); 76 static void skip_to(off_t, LINENUM); 77 static size_t pgets(bool _do_indent); 78 static char *best_name(const struct file_name *, bool); 79 static char *posix_name(const struct file_name *, bool); 80 static size_t num_components(const char *); 81 static LINENUM strtolinenum(char *, char **); 82 83 /* 84 * Prepare to look for the next patch in the patch file. 85 */ 86 void 87 re_patch(void) 88 { 89 p_first = 0; 90 p_newfirst = 0; 91 p_ptrn_lines = 0; 92 p_repl_lines = 0; 93 p_end = (LINENUM) - 1; 94 p_max = 0; 95 p_indent = 0; 96 } 97 98 /* 99 * Open the patch file at the beginning of time. 100 */ 101 void 102 open_patch_file(const char *filename) 103 { 104 struct stat filestat; 105 int nr, nw; 106 107 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 108 pfp = fopen(TMPPATNAME, "w"); 109 if (pfp == NULL) 110 pfatal("can't create %s", TMPPATNAME); 111 while ((nr = fread(buf, 1, buf_size, stdin)) > 0) { 112 nw = fwrite(buf, 1, nr, pfp); 113 if (nr != nw) 114 pfatal("write error to %s", TMPPATNAME); 115 } 116 if (ferror(pfp) || fclose(pfp)) 117 pfatal("can't write %s", TMPPATNAME); 118 filename = TMPPATNAME; 119 } 120 pfp = fopen(filename, "r"); 121 if (pfp == NULL) 122 pfatal("patch file %s not found", filename); 123 if (fstat(fileno(pfp), &filestat)) 124 pfatal("can't stat %s", filename); 125 p_filesize = filestat.st_size; 126 next_intuit_at(0, 1L); /* start at the beginning */ 127 set_hunkmax(); 128 } 129 130 /* 131 * Make sure our dynamically realloced tables are malloced to begin with. 132 */ 133 void 134 set_hunkmax(void) 135 { 136 if (p_line == NULL) 137 p_line = malloc(hunkmax * sizeof(char *)); 138 if (p_len == NULL) 139 p_len = malloc(hunkmax * sizeof(unsigned short)); 140 if (p_char == NULL) 141 p_char = malloc(hunkmax * sizeof(char)); 142 } 143 144 /* 145 * Enlarge the arrays containing the current hunk of patch. 146 */ 147 static void 148 grow_hunkmax(void) 149 { 150 int new_hunkmax = hunkmax * 2; 151 152 if (p_line == NULL || p_len == NULL || p_char == NULL) 153 fatal("Internal memory allocation error\n"); 154 155 p_line = reallocf(p_line, new_hunkmax * sizeof(char *)); 156 p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short)); 157 p_char = reallocf(p_char, new_hunkmax * sizeof(char)); 158 159 if (p_line != NULL && p_len != NULL && p_char != NULL) { 160 hunkmax = new_hunkmax; 161 return; 162 } 163 164 if (!using_plan_a) 165 fatal("out of memory\n"); 166 out_of_mem = true; /* whatever is null will be allocated again */ 167 /* from within plan_a(), of all places */ 168 } 169 170 /* True if the remainder of the patch file contains a diff of some sort. */ 171 172 bool 173 there_is_another_patch(void) 174 { 175 bool exists = false; 176 177 if (p_base != 0 && p_base >= p_filesize) { 178 if (verbose) 179 say("done\n"); 180 return false; 181 } 182 if (verbose) 183 say("Hmm..."); 184 diff_type = intuit_diff_type(); 185 if (!diff_type) { 186 if (p_base != 0) { 187 if (verbose) 188 say(" Ignoring the trailing garbage.\ndone\n"); 189 } else 190 say(" I can't seem to find a patch in there anywhere.\n"); 191 return false; 192 } 193 if (verbose) 194 say(" %sooks like %s to me...\n", 195 (p_base == 0 ? "L" : "The next patch l"), 196 diff_type == UNI_DIFF ? "a unified diff" : 197 diff_type == CONTEXT_DIFF ? "a context diff" : 198 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 199 diff_type == NORMAL_DIFF ? "a normal diff" : 200 "an ed script"); 201 if (p_indent && verbose) 202 say("(Patch is indented %d space%s.)\n", p_indent, 203 p_indent == 1 ? "" : "s"); 204 skip_to(p_start, p_sline); 205 while (filearg[0] == NULL) { 206 if (force || batch) { 207 say("No file to patch. Skipping...\n"); 208 filearg[0] = xstrdup(bestguess); 209 skip_rest_of_patch = true; 210 return true; 211 } 212 ask("File to patch: "); 213 if (*buf != '\n') { 214 free(bestguess); 215 bestguess = xstrdup(buf); 216 filearg[0] = fetchname(buf, &exists, 0); 217 } 218 if (!exists) { 219 ask("No file found--skip this patch? [n] "); 220 if (*buf != 'y') 221 continue; 222 if (verbose) 223 say("Skipping patch...\n"); 224 free(filearg[0]); 225 filearg[0] = fetchname(bestguess, &exists, 0); 226 skip_rest_of_patch = true; 227 return true; 228 } 229 } 230 return true; 231 } 232 233 static void 234 p4_fetchname(struct file_name *name, char *str) 235 { 236 char *t, *h; 237 238 /* Skip leading whitespace. */ 239 while (isspace((unsigned char)*str)) 240 str++; 241 242 /* Remove the file revision number. */ 243 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 244 if (*t == '#') 245 h = t; 246 if (h != NULL) 247 *h = '\0'; 248 249 name->path = fetchname(str, &name->exists, strippath); 250 } 251 252 /* Determine what kind of diff is in the remaining part of the patch file. */ 253 254 static int 255 intuit_diff_type(void) 256 { 257 off_t this_line = 0, previous_line; 258 off_t first_command_line = -1; 259 LINENUM fcl_line = -1; 260 bool last_line_was_command = false, this_is_a_command = false; 261 bool stars_last_line = false, stars_this_line = false; 262 char *s, *t; 263 int indent, retval; 264 struct file_name names[MAX_FILE]; 265 266 memset(names, 0, sizeof(names)); 267 ok_to_create_file = false; 268 fseeko(pfp, p_base, SEEK_SET); 269 p_input_line = p_bline - 1; 270 for (;;) { 271 previous_line = this_line; 272 last_line_was_command = this_is_a_command; 273 stars_last_line = stars_this_line; 274 this_line = ftello(pfp); 275 indent = 0; 276 p_input_line++; 277 if (pgets(false) == 0) { 278 if (first_command_line >= 0) { 279 /* nothing but deletes!? */ 280 p_start = first_command_line; 281 p_sline = fcl_line; 282 retval = ED_DIFF; 283 goto scan_exit; 284 } else { 285 p_start = this_line; 286 p_sline = p_input_line; 287 retval = 0; 288 goto scan_exit; 289 } 290 } 291 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 292 if (*s == '\t') 293 indent += 8 - (indent % 8); 294 else 295 indent++; 296 } 297 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 298 ; 299 this_is_a_command = (isdigit((unsigned char)*s) && 300 (*t == 'd' || *t == 'c' || *t == 'a')); 301 if (first_command_line < 0 && this_is_a_command) { 302 first_command_line = this_line; 303 fcl_line = p_input_line; 304 p_indent = indent; /* assume this for now */ 305 } 306 if (!stars_last_line && strnEQ(s, "*** ", 4)) 307 names[OLD_FILE].path = fetchname(s + 4, 308 &names[OLD_FILE].exists, strippath); 309 else if (strnEQ(s, "--- ", 4)) 310 names[NEW_FILE].path = fetchname(s + 4, 311 &names[NEW_FILE].exists, strippath); 312 else if (strnEQ(s, "+++ ", 4)) 313 /* pretend it is the old name */ 314 names[OLD_FILE].path = fetchname(s + 4, 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, "==== ", 5)) { 332 /* Perforce-style diffs. */ 333 if ((t = strstr(s + 5, " - ")) != NULL) 334 p4_fetchname(&names[NEW_FILE], t + 3); 335 p4_fetchname(&names[OLD_FILE], s + 5); 336 } 337 if ((!diff_type || diff_type == ED_DIFF) && 338 first_command_line >= 0 && 339 strEQ(s, ".\n")) { 340 p_indent = indent; 341 p_start = first_command_line; 342 p_sline = fcl_line; 343 retval = ED_DIFF; 344 goto scan_exit; 345 } 346 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 347 if (strnEQ(s + 4, "0,0", 3)) 348 ok_to_create_file = true; 349 p_indent = indent; 350 p_start = this_line; 351 p_sline = p_input_line; 352 retval = UNI_DIFF; 353 goto scan_exit; 354 } 355 stars_this_line = strnEQ(s, "********", 8); 356 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 357 strnEQ(s, "*** ", 4)) { 358 if (strtolinenum(s + 4, &s) == 0) 359 ok_to_create_file = true; 360 /* 361 * If this is a new context diff the character just 362 * at the end of the line is a '*'. 363 */ 364 while (*s && *s != '\n') 365 s++; 366 p_indent = indent; 367 p_start = previous_line; 368 p_sline = p_input_line - 1; 369 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 370 goto scan_exit; 371 } 372 if ((!diff_type || diff_type == NORMAL_DIFF) && 373 last_line_was_command && 374 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 375 p_start = previous_line; 376 p_sline = p_input_line - 1; 377 p_indent = indent; 378 retval = NORMAL_DIFF; 379 goto scan_exit; 380 } 381 } 382 scan_exit: 383 if (retval == UNI_DIFF) { 384 /* unswap old and new */ 385 struct file_name tmp = names[OLD_FILE]; 386 names[OLD_FILE] = names[NEW_FILE]; 387 names[NEW_FILE] = tmp; 388 } 389 if (filearg[0] == NULL) { 390 if (posix) 391 filearg[0] = posix_name(names, ok_to_create_file); 392 else { 393 /* Ignore the Index: name for context diffs, like GNU */ 394 if (names[OLD_FILE].path != NULL || 395 names[NEW_FILE].path != NULL) { 396 free(names[INDEX_FILE].path); 397 names[INDEX_FILE].path = NULL; 398 } 399 filearg[0] = best_name(names, ok_to_create_file); 400 } 401 } 402 403 free(bestguess); 404 bestguess = NULL; 405 if (filearg[0] != NULL) 406 bestguess = xstrdup(filearg[0]); 407 else if (!ok_to_create_file) { 408 /* 409 * We don't want to create a new file but we need a 410 * filename to set bestguess. Avoid setting filearg[0] 411 * so the file is not created automatically. 412 */ 413 if (posix) 414 bestguess = posix_name(names, true); 415 else 416 bestguess = best_name(names, true); 417 } 418 free(names[OLD_FILE].path); 419 free(names[NEW_FILE].path); 420 free(names[INDEX_FILE].path); 421 return retval; 422 } 423 424 /* 425 * Remember where this patch ends so we know where to start up again. 426 */ 427 static void 428 next_intuit_at(off_t file_pos, LINENUM file_line) 429 { 430 p_base = file_pos; 431 p_bline = file_line; 432 } 433 434 /* 435 * Basically a verbose fseeko() to the actual diff listing. 436 */ 437 static void 438 skip_to(off_t file_pos, LINENUM file_line) 439 { 440 size_t len; 441 442 if (p_base > file_pos) 443 fatal("Internal error: seek %lld>%lld\n", 444 (long long)p_base, (long long)file_pos); 445 if (verbose && p_base < file_pos) { 446 fseeko(pfp, p_base, SEEK_SET); 447 say("The text leading up to this was:\n--------------------------\n"); 448 while (ftello(pfp) < file_pos) { 449 len = pgets(false); 450 if (len == 0) 451 fatal("Unexpected end of file\n"); 452 say("|%s", buf); 453 } 454 say("--------------------------\n"); 455 } else 456 fseeko(pfp, file_pos, SEEK_SET); 457 p_input_line = file_line - 1; 458 } 459 460 /* Make this a function for better debugging. */ 461 static void 462 malformed(void) 463 { 464 fatal("malformed patch at line %ld: %s", p_input_line, buf); 465 /* about as informative as "Syntax error" in C */ 466 } 467 468 /* 469 * True if the line has been discarded (i.e. it is a line saying 470 * "\ No newline at end of file".) 471 */ 472 static bool 473 remove_special_line(void) 474 { 475 int c; 476 477 c = fgetc(pfp); 478 if (c == '\\') { 479 do { 480 c = fgetc(pfp); 481 } while (c != EOF && c != '\n'); 482 483 return true; 484 } 485 if (c != EOF) 486 fseeko(pfp, -1, SEEK_CUR); 487 488 return false; 489 } 490 491 /* 492 * True if there is more of the current diff listing to process. 493 */ 494 bool 495 another_hunk(void) 496 { 497 off_t line_beginning; /* file pos of the current line */ 498 LINENUM repl_beginning; /* index of --- line */ 499 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 500 LINENUM fillsrc; /* index of first line to copy */ 501 LINENUM filldst; /* index of first missing line */ 502 bool ptrn_spaces_eaten; /* ptrn was slightly malformed */ 503 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 504 bool repl_missing; /* we are now backtracking */ 505 off_t repl_backtrack_position; /* file pos of first repl line */ 506 LINENUM repl_patch_line; /* input line number for same */ 507 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 508 char *s; 509 size_t len; 510 int context = 0; 511 512 while (p_end >= 0) { 513 if (p_end == p_efake) 514 p_end = p_bfake; /* don't free twice */ 515 else 516 free(p_line[p_end]); 517 p_end--; 518 } 519 p_efake = -1; 520 521 p_max = hunkmax; /* gets reduced when --- found */ 522 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 523 line_beginning = ftello(pfp); 524 repl_beginning = 0; 525 fillcnt = 0; 526 fillsrc = 0; 527 filldst = 0; 528 ptrn_spaces_eaten = false; 529 repl_could_be_missing = true; 530 repl_missing = false; 531 repl_backtrack_position = 0; 532 repl_patch_line = 0; 533 ptrn_copiable = 0; 534 535 len = pgets(true); 536 p_input_line++; 537 if (len == 0 || strnNE(buf, "********", 8)) { 538 next_intuit_at(line_beginning, p_input_line); 539 return false; 540 } 541 p_context = 100; 542 p_hunk_beg = p_input_line + 1; 543 while (p_end < p_max) { 544 line_beginning = ftello(pfp); 545 len = pgets(true); 546 p_input_line++; 547 if (len == 0) { 548 if (p_max - p_end < 4) { 549 /* assume blank lines got chopped */ 550 strlcpy(buf, " \n", buf_size); 551 } else { 552 if (repl_beginning && repl_could_be_missing) { 553 repl_missing = true; 554 goto hunk_done; 555 } 556 fatal("unexpected end of file in patch\n"); 557 } 558 } 559 p_end++; 560 if (p_end >= hunkmax) 561 fatal("Internal error: hunk larger than hunk " 562 "buffer size"); 563 p_char[p_end] = *buf; 564 p_line[p_end] = NULL; 565 switch (*buf) { 566 case '*': 567 if (strnEQ(buf, "********", 8)) { 568 if (repl_beginning && repl_could_be_missing) { 569 repl_missing = true; 570 goto hunk_done; 571 } else 572 fatal("unexpected end of hunk " 573 "at line %ld\n", 574 p_input_line); 575 } 576 if (p_end != 0) { 577 if (repl_beginning && repl_could_be_missing) { 578 repl_missing = true; 579 goto hunk_done; 580 } 581 fatal("unexpected *** at line %ld: %s", 582 p_input_line, buf); 583 } 584 context = 0; 585 p_line[p_end] = savestr(buf); 586 if (out_of_mem) { 587 p_end--; 588 return false; 589 } 590 for (s = buf; 591 *s && !isdigit((unsigned char)*s); s++) 592 ; 593 if (!*s) 594 malformed(); 595 if (strnEQ(s, "0,0", 3)) 596 memmove(s, s + 2, strlen(s + 2) + 1); 597 p_first = strtolinenum(s, &s); 598 if (*s == ',') { 599 for (; 600 *s && !isdigit((unsigned char)*s); s++) 601 ; 602 if (!*s) 603 malformed(); 604 p_ptrn_lines = strtolinenum(s, &s) - p_first + 1; 605 if (p_ptrn_lines < 0) 606 malformed(); 607 } else if (p_first) 608 p_ptrn_lines = 1; 609 else { 610 p_ptrn_lines = 0; 611 p_first = 1; 612 } 613 if (p_first >= LINENUM_MAX - p_ptrn_lines || 614 p_ptrn_lines >= LINENUM_MAX - 6) 615 malformed(); 616 617 /* we need this much at least */ 618 p_max = p_ptrn_lines + 6; 619 while (p_max >= hunkmax) 620 grow_hunkmax(); 621 p_max = hunkmax; 622 break; 623 case '-': 624 if (buf[1] == '-') { 625 if (repl_beginning || 626 (p_end != p_ptrn_lines + 1 + 627 (p_char[p_end - 1] == '\n'))) { 628 if (p_end == 1) { 629 /* 630 * `old' lines were omitted; 631 * set up to fill them in 632 * from 'new' context lines. 633 */ 634 p_end = p_ptrn_lines + 1; 635 fillsrc = p_end + 1; 636 filldst = 1; 637 fillcnt = p_ptrn_lines; 638 } else { 639 if (repl_beginning) { 640 if (repl_could_be_missing) { 641 repl_missing = true; 642 goto hunk_done; 643 } 644 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 645 p_input_line, p_hunk_beg + repl_beginning); 646 } else { 647 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 648 (p_end <= p_ptrn_lines 649 ? "Premature" 650 : "Overdue"), 651 p_input_line, p_hunk_beg); 652 } 653 } 654 } 655 repl_beginning = p_end; 656 repl_backtrack_position = ftello(pfp); 657 repl_patch_line = p_input_line; 658 p_line[p_end] = savestr(buf); 659 if (out_of_mem) { 660 p_end--; 661 return false; 662 } 663 p_char[p_end] = '='; 664 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 665 ; 666 if (!*s) 667 malformed(); 668 p_newfirst = strtolinenum(s, &s); 669 if (*s == ',') { 670 for (; *s && !isdigit((unsigned char)*s); s++) 671 ; 672 if (!*s) 673 malformed(); 674 p_repl_lines = strtolinenum(s, &s) - 675 p_newfirst + 1; 676 if (p_repl_lines < 0) 677 malformed(); 678 } else if (p_newfirst) 679 p_repl_lines = 1; 680 else { 681 p_repl_lines = 0; 682 p_newfirst = 1; 683 } 684 if (p_newfirst >= LINENUM_MAX - p_repl_lines || 685 p_repl_lines >= LINENUM_MAX - p_end) 686 malformed(); 687 p_max = p_repl_lines + p_end; 688 if (p_max > MAXHUNKSIZE) 689 fatal("hunk too large (%ld lines) at line %ld: %s", 690 p_max, p_input_line, buf); 691 while (p_max >= hunkmax) 692 grow_hunkmax(); 693 if (p_repl_lines != ptrn_copiable && 694 (p_context != 0 || p_repl_lines != 1)) 695 repl_could_be_missing = false; 696 break; 697 } 698 goto change_line; 699 case '+': 700 case '!': 701 repl_could_be_missing = false; 702 change_line: 703 if (buf[1] == '\n' && canonicalize) 704 strlcpy(buf + 1, " \n", buf_size - 1); 705 if (!isspace((unsigned char)buf[1]) && 706 buf[1] != '>' && buf[1] != '<' && 707 repl_beginning && repl_could_be_missing) { 708 repl_missing = true; 709 goto hunk_done; 710 } 711 if (context >= 0) { 712 if (context < p_context) 713 p_context = context; 714 context = -1000; 715 } 716 p_line[p_end] = savestr(buf + 2); 717 if (out_of_mem) { 718 p_end--; 719 return false; 720 } 721 if (p_end == p_ptrn_lines) { 722 if (remove_special_line()) { 723 int l; 724 725 l = strlen(p_line[p_end]) - 1; 726 (p_line[p_end])[l] = 0; 727 } 728 } 729 break; 730 case '\t': 731 case '\n': /* assume the 2 spaces got eaten */ 732 if (repl_beginning && repl_could_be_missing && 733 (!ptrn_spaces_eaten || 734 diff_type == NEW_CONTEXT_DIFF)) { 735 repl_missing = true; 736 goto hunk_done; 737 } 738 p_line[p_end] = savestr(buf); 739 if (out_of_mem) { 740 p_end--; 741 return false; 742 } 743 if (p_end != p_ptrn_lines + 1) { 744 ptrn_spaces_eaten |= (repl_beginning != 0); 745 context++; 746 if (!repl_beginning) 747 ptrn_copiable++; 748 p_char[p_end] = ' '; 749 } 750 break; 751 case ' ': 752 if (!isspace((unsigned char)buf[1]) && 753 repl_beginning && repl_could_be_missing) { 754 repl_missing = true; 755 goto hunk_done; 756 } 757 context++; 758 if (!repl_beginning) 759 ptrn_copiable++; 760 p_line[p_end] = savestr(buf + 2); 761 if (out_of_mem) { 762 p_end--; 763 return false; 764 } 765 break; 766 default: 767 if (repl_beginning && repl_could_be_missing) { 768 repl_missing = true; 769 goto hunk_done; 770 } 771 malformed(); 772 } 773 /* set up p_len for strncmp() so we don't have to */ 774 /* assume null termination */ 775 if (p_line[p_end]) 776 p_len[p_end] = strlen(p_line[p_end]); 777 else 778 p_len[p_end] = 0; 779 } 780 781 hunk_done: 782 if (p_end >= 0 && !repl_beginning) 783 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 784 785 if (repl_missing) { 786 787 /* reset state back to just after --- */ 788 p_input_line = repl_patch_line; 789 for (p_end--; p_end > repl_beginning; p_end--) 790 free(p_line[p_end]); 791 fseeko(pfp, repl_backtrack_position, SEEK_SET); 792 793 /* redundant 'new' context lines were omitted - set */ 794 /* up to fill them in from the old file context */ 795 if (!p_context && p_repl_lines == 1) { 796 p_repl_lines = 0; 797 p_max--; 798 } 799 fillsrc = 1; 800 filldst = repl_beginning + 1; 801 fillcnt = p_repl_lines; 802 p_end = p_max; 803 } else if (!p_context && fillcnt == 1) { 804 /* the first hunk was a null hunk with no context */ 805 /* and we were expecting one line -- fix it up. */ 806 while (filldst < p_end) { 807 p_line[filldst] = p_line[filldst + 1]; 808 p_char[filldst] = p_char[filldst + 1]; 809 p_len[filldst] = p_len[filldst + 1]; 810 filldst++; 811 } 812 #if 0 813 repl_beginning--; /* this doesn't need to be fixed */ 814 #endif 815 p_end--; 816 p_first++; /* do append rather than insert */ 817 fillcnt = 0; 818 p_ptrn_lines = 0; 819 } 820 if (diff_type == CONTEXT_DIFF && 821 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 822 if (verbose) 823 say("%s\n%s\n%s\n", 824 "(Fascinating--this is really a new-style context diff but without", 825 "the telltale extra asterisks on the *** line that usually indicate", 826 "the new style...)"); 827 diff_type = NEW_CONTEXT_DIFF; 828 } 829 /* if there were omitted context lines, fill them in now */ 830 if (fillcnt) { 831 p_bfake = filldst; /* remember where not to free() */ 832 p_efake = filldst + fillcnt - 1; 833 while (fillcnt-- > 0) { 834 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 835 fillsrc++; 836 if (fillsrc > p_end) 837 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 838 p_hunk_beg); 839 p_line[filldst] = p_line[fillsrc]; 840 p_char[filldst] = p_char[fillsrc]; 841 p_len[filldst] = p_len[fillsrc]; 842 fillsrc++; 843 filldst++; 844 } 845 while (fillsrc <= p_end && fillsrc != repl_beginning && 846 p_char[fillsrc] != ' ') 847 fillsrc++; 848 #ifdef DEBUGGING 849 if (debug & 64) 850 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 851 fillsrc, filldst, repl_beginning, p_end + 1); 852 #endif 853 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 854 malformed(); 855 if (filldst != p_end + 1 && filldst != repl_beginning) 856 malformed(); 857 } 858 if (p_line[p_end] != NULL) { 859 if (remove_special_line()) { 860 p_len[p_end] -= 1; 861 (p_line[p_end])[p_len[p_end]] = 0; 862 } 863 } 864 } else if (diff_type == UNI_DIFF) { 865 LINENUM fillold; /* index of old lines */ 866 LINENUM fillnew; /* index of new lines */ 867 char ch; 868 869 line_beginning = ftello(pfp); /* file pos of the current line */ 870 len = pgets(true); 871 p_input_line++; 872 if (len == 0 || strnNE(buf, "@@ -", 4)) { 873 next_intuit_at(line_beginning, p_input_line); 874 return false; 875 } 876 s = buf + 4; 877 if (!*s) 878 malformed(); 879 p_first = strtolinenum(s, &s); 880 if (*s == ',') { 881 p_ptrn_lines = strtolinenum(s + 1, &s); 882 } else 883 p_ptrn_lines = 1; 884 if (*s == ' ') 885 s++; 886 if (*s != '+' || !*++s) 887 malformed(); 888 p_newfirst = strtolinenum(s, &s); 889 if (*s == ',') { 890 p_repl_lines = strtolinenum(s + 1, &s); 891 } else 892 p_repl_lines = 1; 893 if (*s == ' ') 894 s++; 895 if (*s != '@') 896 malformed(); 897 if (p_first >= LINENUM_MAX - p_ptrn_lines || 898 p_newfirst > LINENUM_MAX - p_repl_lines || 899 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 900 malformed(); 901 if (!p_ptrn_lines) 902 p_first++; /* do append rather than insert */ 903 p_max = p_ptrn_lines + p_repl_lines + 1; 904 while (p_max >= hunkmax) 905 grow_hunkmax(); 906 fillold = 1; 907 fillnew = fillold + p_ptrn_lines; 908 p_end = fillnew + p_repl_lines; 909 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 910 p_first + p_ptrn_lines - 1); 911 p_line[0] = savestr(buf); 912 if (out_of_mem) { 913 p_end = -1; 914 return false; 915 } 916 p_char[0] = '*'; 917 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 918 p_newfirst + p_repl_lines - 1); 919 p_line[fillnew] = savestr(buf); 920 if (out_of_mem) { 921 p_end = 0; 922 return false; 923 } 924 p_char[fillnew++] = '='; 925 p_context = 100; 926 context = 0; 927 p_hunk_beg = p_input_line + 1; 928 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 929 line_beginning = ftello(pfp); 930 len = pgets(true); 931 p_input_line++; 932 if (len == 0) { 933 if (p_max - fillnew < 3) { 934 /* assume blank lines got chopped */ 935 strlcpy(buf, " \n", buf_size); 936 } else { 937 fatal("unexpected end of file in patch\n"); 938 } 939 } 940 if (*buf == '\t' || *buf == '\n') { 941 ch = ' '; /* assume the space got eaten */ 942 s = savestr(buf); 943 } else { 944 ch = *buf; 945 s = savestr(buf + 1); 946 } 947 if (out_of_mem) { 948 while (--fillnew > p_ptrn_lines) 949 free(p_line[fillnew]); 950 p_end = fillold - 1; 951 return false; 952 } 953 switch (ch) { 954 case '-': 955 if (fillold > p_ptrn_lines) { 956 free(s); 957 p_end = fillnew - 1; 958 malformed(); 959 } 960 p_char[fillold] = ch; 961 p_line[fillold] = s; 962 p_len[fillold++] = strlen(s); 963 if (fillold > p_ptrn_lines) { 964 if (remove_special_line()) { 965 p_len[fillold - 1] -= 1; 966 s[p_len[fillold - 1]] = 0; 967 } 968 } 969 break; 970 case '=': 971 ch = ' '; 972 /* FALL THROUGH */ 973 case ' ': 974 if (fillold > p_ptrn_lines) { 975 free(s); 976 while (--fillnew > p_ptrn_lines) 977 free(p_line[fillnew]); 978 p_end = fillold - 1; 979 malformed(); 980 } 981 context++; 982 p_char[fillold] = ch; 983 p_line[fillold] = s; 984 p_len[fillold++] = strlen(s); 985 s = savestr(s); 986 if (out_of_mem) { 987 while (--fillnew > p_ptrn_lines) 988 free(p_line[fillnew]); 989 p_end = fillold - 1; 990 return false; 991 } 992 if (fillold > p_ptrn_lines) { 993 if (remove_special_line()) { 994 p_len[fillold - 1] -= 1; 995 s[p_len[fillold - 1]] = 0; 996 } 997 } 998 /* FALL THROUGH */ 999 case '+': 1000 if (fillnew > p_end) { 1001 free(s); 1002 while (--fillnew > p_ptrn_lines) 1003 free(p_line[fillnew]); 1004 p_end = fillold - 1; 1005 malformed(); 1006 } 1007 p_char[fillnew] = ch; 1008 p_line[fillnew] = s; 1009 p_len[fillnew++] = strlen(s); 1010 if (fillold > p_ptrn_lines) { 1011 if (remove_special_line()) { 1012 p_len[fillnew - 1] -= 1; 1013 s[p_len[fillnew - 1]] = 0; 1014 } 1015 } 1016 break; 1017 default: 1018 p_end = fillnew; 1019 malformed(); 1020 } 1021 if (ch != ' ' && context > 0) { 1022 if (context < p_context) 1023 p_context = context; 1024 context = -1000; 1025 } 1026 } /* while */ 1027 } else { /* normal diff--fake it up */ 1028 char hunk_type; 1029 int i; 1030 LINENUM min, max; 1031 1032 line_beginning = ftello(pfp); 1033 p_context = 0; 1034 len = pgets(true); 1035 p_input_line++; 1036 if (len == 0 || !isdigit((unsigned char)*buf)) { 1037 next_intuit_at(line_beginning, p_input_line); 1038 return false; 1039 } 1040 p_first = strtolinenum(buf, &s); 1041 if (*s == ',') { 1042 p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1; 1043 if (p_ptrn_lines < 0) 1044 malformed(); 1045 } else 1046 p_ptrn_lines = (*s != 'a'); 1047 hunk_type = *s; 1048 if (hunk_type == 'a') 1049 p_first++; /* do append rather than insert */ 1050 min = strtolinenum(s + 1, &s); 1051 if (*s == ',') 1052 max = strtolinenum(s + 1, &s); 1053 else 1054 max = min; 1055 if (min < 0 || min > max || max - min == LINENUM_MAX) 1056 malformed(); 1057 if (hunk_type == 'd') 1058 min++; 1059 p_newfirst = min; 1060 p_repl_lines = max - min + 1; 1061 if (p_newfirst > LINENUM_MAX - p_repl_lines || 1062 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1063 malformed(); 1064 p_end = p_ptrn_lines + p_repl_lines + 1; 1065 if (p_end > MAXHUNKSIZE) 1066 fatal("hunk too large (%ld lines) at line %ld: %s", 1067 p_end, p_input_line, buf); 1068 while (p_end >= hunkmax) 1069 grow_hunkmax(); 1070 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1071 p_first + p_ptrn_lines - 1); 1072 p_line[0] = savestr(buf); 1073 if (out_of_mem) { 1074 p_end = -1; 1075 return false; 1076 } 1077 p_char[0] = '*'; 1078 for (i = 1; i <= p_ptrn_lines; i++) { 1079 len = pgets(true); 1080 p_input_line++; 1081 if (len == 0) 1082 fatal("unexpected end of file in patch at line %ld\n", 1083 p_input_line); 1084 if (*buf != '<') 1085 fatal("< expected at line %ld of patch\n", 1086 p_input_line); 1087 p_line[i] = savestr(buf + 2); 1088 if (out_of_mem) { 1089 p_end = i - 1; 1090 return false; 1091 } 1092 p_len[i] = strlen(p_line[i]); 1093 p_char[i] = '-'; 1094 } 1095 1096 if (remove_special_line()) { 1097 p_len[i - 1] -= 1; 1098 (p_line[i - 1])[p_len[i - 1]] = 0; 1099 } 1100 if (hunk_type == 'c') { 1101 len = pgets(true); 1102 p_input_line++; 1103 if (len == 0) 1104 fatal("unexpected end of file in patch at line %ld\n", 1105 p_input_line); 1106 if (*buf != '-') 1107 fatal("--- expected at line %ld of patch\n", 1108 p_input_line); 1109 } 1110 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1111 p_line[i] = savestr(buf); 1112 if (out_of_mem) { 1113 p_end = i - 1; 1114 return false; 1115 } 1116 p_char[i] = '='; 1117 for (i++; i <= p_end; i++) { 1118 len = pgets(true); 1119 p_input_line++; 1120 if (len == 0) 1121 fatal("unexpected end of file in patch at line %ld\n", 1122 p_input_line); 1123 if (*buf != '>') 1124 fatal("> expected at line %ld of patch\n", 1125 p_input_line); 1126 p_line[i] = savestr(buf + 2); 1127 if (out_of_mem) { 1128 p_end = i - 1; 1129 return false; 1130 } 1131 p_len[i] = strlen(p_line[i]); 1132 p_char[i] = '+'; 1133 } 1134 1135 if (remove_special_line()) { 1136 p_len[i - 1] -= 1; 1137 (p_line[i - 1])[p_len[i - 1]] = 0; 1138 } 1139 } 1140 if (reverse) /* backwards patch? */ 1141 if (!pch_swap()) 1142 say("Not enough memory to swap next hunk!\n"); 1143 #ifdef DEBUGGING 1144 if (debug & 2) { 1145 LINENUM i; 1146 char special; 1147 1148 for (i = 0; i <= p_end; i++) { 1149 if (i == p_ptrn_lines) 1150 special = '^'; 1151 else 1152 special = ' '; 1153 fprintf(stderr, "%3ld %c %c %s", i, p_char[i], 1154 special, p_line[i]); 1155 fflush(stderr); 1156 } 1157 } 1158 #endif 1159 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1160 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1161 return true; 1162 } 1163 1164 /* 1165 * Input a line from the patch file. 1166 * Worry about indentation if do_indent is true. 1167 * The line is read directly into the buf global variable which 1168 * is resized if necessary in order to hold the complete line. 1169 * Returns the number of characters read including the terminating 1170 * '\n', if any. 1171 */ 1172 size_t 1173 pgets(bool do_indent) 1174 { 1175 char *line; 1176 size_t len; 1177 int indent = 0, skipped = 0; 1178 1179 line = fgetln(pfp, &len); 1180 if (line != NULL) { 1181 if (len + 1 > buf_size) { 1182 while (len + 1 > buf_size) 1183 buf_size *= 2; 1184 free(buf); 1185 buf = malloc(buf_size); 1186 if (buf == NULL) 1187 fatal("out of memory\n"); 1188 } 1189 if (do_indent == 1 && p_indent) { 1190 for (; 1191 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1192 line++, skipped++) { 1193 if (*line == '\t') 1194 indent += 8 - (indent %7); 1195 else 1196 indent++; 1197 } 1198 } 1199 memcpy(buf, line, len - skipped); 1200 buf[len - skipped] = '\0'; 1201 } 1202 return len; 1203 } 1204 1205 1206 /* 1207 * Reverse the old and new portions of the current hunk. 1208 */ 1209 bool 1210 pch_swap(void) 1211 { 1212 char **tp_line; /* the text of the hunk */ 1213 unsigned short *tp_len;/* length of each line */ 1214 char *tp_char; /* +, -, and ! */ 1215 LINENUM i; 1216 LINENUM n; 1217 bool blankline = false; 1218 char *s; 1219 1220 i = p_first; 1221 p_first = p_newfirst; 1222 p_newfirst = i; 1223 1224 /* make a scratch copy */ 1225 1226 tp_line = p_line; 1227 tp_len = p_len; 1228 tp_char = p_char; 1229 p_line = NULL; /* force set_hunkmax to allocate again */ 1230 p_len = NULL; 1231 p_char = NULL; 1232 set_hunkmax(); 1233 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1234 1235 free(p_line); 1236 p_line = tp_line; 1237 free(p_len); 1238 p_len = tp_len; 1239 free(p_char); 1240 p_char = tp_char; 1241 return false; /* not enough memory to swap hunk! */ 1242 } 1243 /* now turn the new into the old */ 1244 1245 i = p_ptrn_lines + 1; 1246 if (tp_char[i] == '\n') { /* account for possible blank line */ 1247 blankline = true; 1248 i++; 1249 } 1250 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1251 if (p_efake <= i) 1252 n = p_end - i + 1; 1253 else 1254 n = -i; 1255 p_efake += n; 1256 p_bfake += n; 1257 } 1258 for (n = 0; i <= p_end; i++, n++) { 1259 p_line[n] = tp_line[i]; 1260 p_char[n] = tp_char[i]; 1261 if (p_char[n] == '+') 1262 p_char[n] = '-'; 1263 p_len[n] = tp_len[i]; 1264 } 1265 if (blankline) { 1266 i = p_ptrn_lines + 1; 1267 p_line[n] = tp_line[i]; 1268 p_char[n] = tp_char[i]; 1269 p_len[n] = tp_len[i]; 1270 n++; 1271 } 1272 if (p_char[0] != '=') 1273 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1274 p_input_line, p_char[0]); 1275 p_char[0] = '*'; 1276 for (s = p_line[0]; *s; s++) 1277 if (*s == '-') 1278 *s = '*'; 1279 1280 /* now turn the old into the new */ 1281 1282 if (p_char[0] != '*') 1283 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1284 p_input_line, p_char[0]); 1285 tp_char[0] = '='; 1286 for (s = tp_line[0]; *s; s++) 1287 if (*s == '*') 1288 *s = '-'; 1289 for (i = 0; n <= p_end; i++, n++) { 1290 p_line[n] = tp_line[i]; 1291 p_char[n] = tp_char[i]; 1292 if (p_char[n] == '-') 1293 p_char[n] = '+'; 1294 p_len[n] = tp_len[i]; 1295 } 1296 1297 if (i != p_ptrn_lines + 1) 1298 fatal("Malformed patch at line %ld: expected %ld lines, " 1299 "got %ld\n", 1300 p_input_line, p_ptrn_lines + 1, i); 1301 1302 i = p_ptrn_lines; 1303 p_ptrn_lines = p_repl_lines; 1304 p_repl_lines = i; 1305 1306 free(tp_line); 1307 free(tp_len); 1308 free(tp_char); 1309 1310 return true; 1311 } 1312 1313 /* 1314 * Return the specified line position in the old file of the old context. 1315 */ 1316 LINENUM 1317 pch_first(void) 1318 { 1319 return p_first; 1320 } 1321 1322 /* 1323 * Return the number of lines of old context. 1324 */ 1325 LINENUM 1326 pch_ptrn_lines(void) 1327 { 1328 return p_ptrn_lines; 1329 } 1330 1331 /* 1332 * Return the probable line position in the new file of the first line. 1333 */ 1334 LINENUM 1335 pch_newfirst(void) 1336 { 1337 return p_newfirst; 1338 } 1339 1340 /* 1341 * Return the number of lines in the replacement text including context. 1342 */ 1343 LINENUM 1344 pch_repl_lines(void) 1345 { 1346 return p_repl_lines; 1347 } 1348 1349 /* 1350 * Return the number of lines in the whole hunk. 1351 */ 1352 LINENUM 1353 pch_end(void) 1354 { 1355 return p_end; 1356 } 1357 1358 /* 1359 * Return the number of context lines before the first changed line. 1360 */ 1361 LINENUM 1362 pch_context(void) 1363 { 1364 return p_context; 1365 } 1366 1367 /* 1368 * Return the length of a particular patch line. 1369 */ 1370 unsigned short 1371 pch_line_len(LINENUM line) 1372 { 1373 return p_len[line]; 1374 } 1375 1376 /* 1377 * Return the control character (+, -, *, !, etc) for a patch line. 1378 */ 1379 char 1380 pch_char(LINENUM line) 1381 { 1382 return p_char[line]; 1383 } 1384 1385 /* 1386 * Return a pointer to a particular patch line. 1387 */ 1388 char * 1389 pfetch(LINENUM line) 1390 { 1391 return p_line[line]; 1392 } 1393 1394 /* 1395 * Return where in the patch file this hunk began, for error messages. 1396 */ 1397 LINENUM 1398 pch_hunk_beg(void) 1399 { 1400 return p_hunk_beg; 1401 } 1402 1403 /* 1404 * Apply an ed script by feeding ed itself. 1405 */ 1406 void 1407 do_ed_script(void) 1408 { 1409 char *t; 1410 off_t beginning_of_this_line; 1411 FILE *pipefp = NULL; 1412 int continuation; 1413 1414 if (!skip_rest_of_patch) { 1415 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1416 unlink(TMPOUTNAME); 1417 fatal("can't create temp file %s", TMPOUTNAME); 1418 } 1419 snprintf(buf, buf_size, "%s%s%s", _PATH_RED, 1420 verbose ? " " : " -s ", TMPOUTNAME); 1421 pipefp = popen(buf, "w"); 1422 } 1423 for (;;) { 1424 beginning_of_this_line = ftello(pfp); 1425 if (pgets(true) == 0) { 1426 next_intuit_at(beginning_of_this_line, p_input_line); 1427 break; 1428 } 1429 p_input_line++; 1430 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1431 ; 1432 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1433 if (isdigit((unsigned char)*buf) && 1434 (*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) { 1435 if (pipefp != NULL) 1436 fputs(buf, pipefp); 1437 if (*t == 's') { 1438 for (;;) { 1439 continuation = 0; 1440 t = strchr(buf, '\0') - 1; 1441 while (--t >= buf && *t == '\\') 1442 continuation = !continuation; 1443 if (!continuation || 1444 pgets(true) == 0) 1445 break; 1446 if (pipefp != NULL) 1447 fputs(buf, pipefp); 1448 } 1449 } else if (*t != 'd') { 1450 while (pgets(true)) { 1451 p_input_line++; 1452 if (pipefp != NULL) 1453 fputs(buf, pipefp); 1454 if (strEQ(buf, ".\n")) 1455 break; 1456 } 1457 } 1458 } else { 1459 next_intuit_at(beginning_of_this_line, p_input_line); 1460 break; 1461 } 1462 } 1463 if (pipefp == NULL) 1464 return; 1465 fprintf(pipefp, "w\n"); 1466 fprintf(pipefp, "q\n"); 1467 fflush(pipefp); 1468 pclose(pipefp); 1469 ignore_signals(); 1470 if (!check_only) { 1471 if (move_file(TMPOUTNAME, outname) < 0) { 1472 toutkeep = true; 1473 chmod(TMPOUTNAME, filemode); 1474 } else 1475 chmod(outname, filemode); 1476 } 1477 set_signals(1); 1478 } 1479 1480 /* 1481 * Choose the name of the file to be patched based on POSIX rules. 1482 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1483 * if the user specified --posix or set POSIXLY_CORRECT. 1484 */ 1485 static char * 1486 posix_name(const struct file_name *names, bool assume_exists) 1487 { 1488 char *path = NULL; 1489 int i; 1490 1491 /* 1492 * POSIX states that the filename will be chosen from one 1493 * of the old, new and index names (in that order) if 1494 * the file exists relative to CWD after -p stripping. 1495 */ 1496 for (i = 0; i < MAX_FILE; i++) { 1497 if (names[i].path != NULL && names[i].exists) { 1498 path = names[i].path; 1499 break; 1500 } 1501 } 1502 if (path == NULL && !assume_exists) { 1503 /* 1504 * No files found, check to see if the diff could be 1505 * creating a new file. 1506 */ 1507 if (path == NULL && ok_to_create_file && 1508 names[NEW_FILE].path != NULL) 1509 path = names[NEW_FILE].path; 1510 } 1511 1512 return path ? xstrdup(path) : NULL; 1513 } 1514 1515 static char * 1516 compare_names(const struct file_name *names, bool assume_exists) 1517 { 1518 size_t min_components, min_baselen, min_len, tmp; 1519 char *best = NULL; 1520 char *path; 1521 int i; 1522 1523 /* 1524 * The "best" name is the one with the fewest number of path 1525 * components, the shortest basename length, and the shortest 1526 * overall length (in that order). We only use the Index: file 1527 * if neither of the old or new files could be intuited from 1528 * the diff header. 1529 */ 1530 min_components = min_baselen = min_len = SIZE_MAX; 1531 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1532 path = names[i].path; 1533 if (path == NULL || (!names[i].exists && !assume_exists)) 1534 continue; 1535 if ((tmp = num_components(path)) > min_components) 1536 continue; 1537 if (tmp < min_components) { 1538 min_components = tmp; 1539 best = path; 1540 } 1541 if ((tmp = strlen(basename(path))) > min_baselen) 1542 continue; 1543 if (tmp < min_baselen) { 1544 min_baselen = tmp; 1545 best = path; 1546 } 1547 if ((tmp = strlen(path)) > min_len) 1548 continue; 1549 min_len = tmp; 1550 best = path; 1551 } 1552 return best; 1553 } 1554 1555 /* 1556 * Choose the name of the file to be patched based the "best" one 1557 * available. 1558 */ 1559 static char * 1560 best_name(const struct file_name *names, bool assume_exists) 1561 { 1562 char *best; 1563 1564 best = compare_names(names, assume_exists); 1565 1566 /* No match? Check to see if the diff could be creating a new file. */ 1567 if (best == NULL && ok_to_create_file) 1568 best = names[NEW_FILE].path; 1569 1570 return best ? xstrdup(best) : NULL; 1571 } 1572 1573 static size_t 1574 num_components(const char *path) 1575 { 1576 size_t n; 1577 const char *cp; 1578 1579 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1580 while (*cp == '/') 1581 cp++; /* skip consecutive slashes */ 1582 } 1583 return n; 1584 } 1585 1586 /* 1587 * Convert number at NPTR into LINENUM and save address of first 1588 * character that is not a digit in ENDPTR. If conversion is not 1589 * possible, call fatal. 1590 */ 1591 static LINENUM 1592 strtolinenum(char *nptr, char **endptr) 1593 { 1594 LINENUM rv; 1595 char c; 1596 char *p; 1597 const char *errstr; 1598 1599 for (p = nptr; isdigit((unsigned char)*p); p++) 1600 ; 1601 1602 if (p == nptr) 1603 malformed(); 1604 1605 c = *p; 1606 *p = '\0'; 1607 1608 rv = strtonum(nptr, 0, LINENUM_MAX, &errstr); 1609 if (errstr != NULL) 1610 fatal("invalid line number at line %ld: `%s' is %s\n", 1611 p_input_line, nptr, errstr); 1612 1613 *p = c; 1614 *endptr = p; 1615 1616 return rv; 1617 } 1618