1 2 /*- 3 * Copyright 1986, Larry Wall 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following condition is met: 7 * 1. Redistributions of source code must retain the above copyright notice, 8 * this condition and the following disclaimer. 9 * 10 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 11 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 12 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 13 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 14 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 15 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 16 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 17 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 18 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 19 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 20 * SUCH DAMAGE. 21 * 22 * patch - a program to apply diffs to original files 23 * 24 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 25 * behaviour 26 * 27 * $OpenBSD: pch.c,v 1.43 2014/11/18 17:03:35 tobias Exp $ 28 * $FreeBSD$ 29 */ 30 31 #include <sys/types.h> 32 #include <sys/stat.h> 33 34 #include <ctype.h> 35 #include <libgen.h> 36 #include <limits.h> 37 #include <stdint.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #include "common.h" 44 #include "util.h" 45 #include "pch.h" 46 #include "pathnames.h" 47 48 /* Patch (diff listing) abstract type. */ 49 50 static 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 LINENUM p_input_line = 0; /* current line # from patch file */ 59 static char **p_line = NULL;/* the text of the hunk */ 60 static unsigned short *p_len = NULL; /* length of each line */ 61 static char *p_char = NULL; /* +, -, and ! */ 62 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 63 static int p_indent; /* indent to patch */ 64 static off_t p_base; /* where to intuit this time */ 65 static LINENUM p_bline; /* line # of p_base */ 66 static off_t p_start; /* where intuit found a patch */ 67 static LINENUM p_sline; /* and the line number for it */ 68 static LINENUM p_hunk_beg; /* line number of current hunk */ 69 static LINENUM p_efake = -1; /* end of faked up lines--don't free */ 70 static LINENUM p_bfake = -1; /* beg of faked up lines */ 71 static FILE *pfp = NULL; /* patch file pointer */ 72 static char *bestguess = NULL; /* guess at correct filename */ 73 74 static void grow_hunkmax(void); 75 static int intuit_diff_type(void); 76 static void next_intuit_at(off_t, LINENUM); 77 static void skip_to(off_t, LINENUM); 78 static size_t pgets(bool _do_indent); 79 static char *best_name(const struct file_name *, bool); 80 static char *posix_name(const struct file_name *, bool); 81 static size_t num_components(const char *); 82 static LINENUM strtolinenum(char *, char **); 83 84 /* 85 * Prepare to look for the next patch in the patch file. 86 */ 87 void 88 re_patch(void) 89 { 90 p_first = 0; 91 p_newfirst = 0; 92 p_ptrn_lines = 0; 93 p_repl_lines = 0; 94 p_end = (LINENUM) - 1; 95 p_max = 0; 96 p_indent = 0; 97 } 98 99 /* 100 * Open the patch file at the beginning of time. 101 */ 102 void 103 open_patch_file(const char *filename) 104 { 105 struct stat filestat; 106 int nr, nw; 107 108 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 109 pfp = fopen(TMPPATNAME, "w"); 110 if (pfp == NULL) 111 pfatal("can't create %s", TMPPATNAME); 112 while ((nr = fread(buf, 1, buf_size, stdin)) > 0) { 113 nw = fwrite(buf, 1, nr, pfp); 114 if (nr != nw) 115 pfatal("write error to %s", TMPPATNAME); 116 } 117 if (ferror(pfp) || fclose(pfp)) 118 pfatal("can't write %s", TMPPATNAME); 119 filename = TMPPATNAME; 120 } 121 pfp = fopen(filename, "r"); 122 if (pfp == NULL) 123 pfatal("patch file %s not found", filename); 124 if (fstat(fileno(pfp), &filestat)) 125 pfatal("can't stat %s", filename); 126 p_filesize = filestat.st_size; 127 next_intuit_at(0, 1L); /* start at the beginning */ 128 set_hunkmax(); 129 } 130 131 /* 132 * Make sure our dynamically realloced tables are malloced to begin with. 133 */ 134 void 135 set_hunkmax(void) 136 { 137 if (p_line == NULL) 138 p_line = malloc(hunkmax * sizeof(char *)); 139 if (p_len == NULL) 140 p_len = malloc(hunkmax * sizeof(unsigned short)); 141 if (p_char == NULL) 142 p_char = malloc(hunkmax * sizeof(char)); 143 } 144 145 /* 146 * Enlarge the arrays containing the current hunk of patch. 147 */ 148 static void 149 grow_hunkmax(void) 150 { 151 int new_hunkmax = hunkmax * 2; 152 153 if (p_line == NULL || p_len == NULL || p_char == NULL) 154 fatal("Internal memory allocation error\n"); 155 156 p_line = reallocf(p_line, new_hunkmax * sizeof(char *)); 157 p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short)); 158 p_char = reallocf(p_char, new_hunkmax * sizeof(char)); 159 160 if (p_line != NULL && p_len != NULL && p_char != NULL) { 161 hunkmax = new_hunkmax; 162 return; 163 } 164 165 if (!using_plan_a) 166 fatal("out of memory\n"); 167 out_of_mem = true; /* whatever is null will be allocated again */ 168 /* from within plan_a(), of all places */ 169 } 170 171 /* True if the remainder of the patch file contains a diff of some sort. */ 172 173 bool 174 there_is_another_patch(void) 175 { 176 bool exists = false; 177 178 if (p_base != 0 && p_base >= p_filesize) { 179 if (verbose) 180 say("done\n"); 181 return false; 182 } 183 if (verbose) 184 say("Hmm..."); 185 diff_type = intuit_diff_type(); 186 if (!diff_type) { 187 if (p_base != 0) { 188 if (verbose) 189 say(" Ignoring the trailing garbage.\ndone\n"); 190 } else 191 say(" I can't seem to find a patch in there anywhere.\n"); 192 return false; 193 } 194 if (verbose) 195 say(" %sooks like %s to me...\n", 196 (p_base == 0 ? "L" : "The next patch l"), 197 diff_type == UNI_DIFF ? "a unified diff" : 198 diff_type == CONTEXT_DIFF ? "a context diff" : 199 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 200 diff_type == NORMAL_DIFF ? "a normal diff" : 201 "an ed script"); 202 if (p_indent && verbose) 203 say("(Patch is indented %d space%s.)\n", p_indent, 204 p_indent == 1 ? "" : "s"); 205 skip_to(p_start, p_sline); 206 while (filearg[0] == NULL) { 207 if (force || batch) { 208 say("No file to patch. Skipping...\n"); 209 filearg[0] = xstrdup(bestguess); 210 skip_rest_of_patch = true; 211 return true; 212 } 213 ask("File to patch: "); 214 if (*buf != '\n') { 215 free(bestguess); 216 bestguess = xstrdup(buf); 217 filearg[0] = fetchname(buf, &exists, 0); 218 } 219 if (!exists) { 220 ask("No file found--skip this patch? [n] "); 221 if (*buf != 'y') 222 continue; 223 if (verbose) 224 say("Skipping patch...\n"); 225 free(filearg[0]); 226 filearg[0] = fetchname(bestguess, &exists, 0); 227 skip_rest_of_patch = true; 228 return true; 229 } 230 } 231 return true; 232 } 233 234 static void 235 p4_fetchname(struct file_name *name, char *str) 236 { 237 char *t, *h; 238 239 /* Skip leading whitespace. */ 240 while (isspace((unsigned char)*str)) 241 str++; 242 243 /* Remove the file revision number. */ 244 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 245 if (*t == '#') 246 h = t; 247 if (h != NULL) 248 *h = '\0'; 249 250 name->path = fetchname(str, &name->exists, strippath); 251 } 252 253 /* Determine what kind of diff is in the remaining part of the patch file. */ 254 255 static int 256 intuit_diff_type(void) 257 { 258 off_t this_line = 0, previous_line; 259 off_t first_command_line = -1; 260 LINENUM fcl_line = -1; 261 bool last_line_was_command = false, this_is_a_command = false; 262 bool stars_last_line = false, stars_this_line = false; 263 char *s, *t; 264 int indent, retval; 265 struct file_name names[MAX_FILE]; 266 267 memset(names, 0, sizeof(names)); 268 ok_to_create_file = false; 269 fseeko(pfp, p_base, SEEK_SET); 270 p_input_line = p_bline - 1; 271 for (;;) { 272 previous_line = this_line; 273 last_line_was_command = this_is_a_command; 274 stars_last_line = stars_this_line; 275 this_line = ftello(pfp); 276 indent = 0; 277 p_input_line++; 278 if (pgets(false) == 0) { 279 if (first_command_line >= 0) { 280 /* nothing but deletes!? */ 281 p_start = first_command_line; 282 p_sline = fcl_line; 283 retval = ED_DIFF; 284 goto scan_exit; 285 } else { 286 p_start = this_line; 287 p_sline = p_input_line; 288 retval = 0; 289 goto scan_exit; 290 } 291 } 292 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 293 if (*s == '\t') 294 indent += 8 - (indent % 8); 295 else 296 indent++; 297 } 298 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 299 ; 300 this_is_a_command = (isdigit((unsigned char)*s) && 301 (*t == 'd' || *t == 'c' || *t == 'a')); 302 if (first_command_line < 0 && this_is_a_command) { 303 first_command_line = this_line; 304 fcl_line = p_input_line; 305 p_indent = indent; /* assume this for now */ 306 } 307 if (!stars_last_line && strnEQ(s, "*** ", 4)) 308 names[OLD_FILE].path = fetchname(s + 4, 309 &names[OLD_FILE].exists, strippath); 310 else if (strnEQ(s, "--- ", 4)) 311 names[NEW_FILE].path = fetchname(s + 4, 312 &names[NEW_FILE].exists, strippath); 313 else if (strnEQ(s, "+++ ", 4)) 314 /* pretend it is the old name */ 315 names[OLD_FILE].path = fetchname(s + 4, 316 &names[OLD_FILE].exists, strippath); 317 else if (strnEQ(s, "Index:", 6)) 318 names[INDEX_FILE].path = fetchname(s + 6, 319 &names[INDEX_FILE].exists, strippath); 320 else if (strnEQ(s, "Prereq:", 7)) { 321 for (t = s + 7; isspace((unsigned char)*t); t++) 322 ; 323 revision = xstrdup(t); 324 for (t = revision; 325 *t && !isspace((unsigned char)*t); t++) 326 ; 327 *t = '\0'; 328 if (*revision == '\0') { 329 free(revision); 330 revision = NULL; 331 } 332 } else if (strnEQ(s, "==== ", 5)) { 333 /* Perforce-style diffs. */ 334 if ((t = strstr(s + 5, " - ")) != NULL) 335 p4_fetchname(&names[NEW_FILE], t + 3); 336 p4_fetchname(&names[OLD_FILE], s + 5); 337 } 338 if ((!diff_type || diff_type == ED_DIFF) && 339 first_command_line >= 0 && 340 strEQ(s, ".\n")) { 341 p_indent = indent; 342 p_start = first_command_line; 343 p_sline = fcl_line; 344 retval = ED_DIFF; 345 goto scan_exit; 346 } 347 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 348 if (strnEQ(s + 4, "0,0", 3)) 349 ok_to_create_file = true; 350 p_indent = indent; 351 p_start = this_line; 352 p_sline = p_input_line; 353 retval = UNI_DIFF; 354 goto scan_exit; 355 } 356 stars_this_line = strnEQ(s, "********", 8); 357 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 358 strnEQ(s, "*** ", 4)) { 359 if (strtolinenum(s + 4, &s) == 0) 360 ok_to_create_file = true; 361 /* 362 * If this is a new context diff the character just 363 * at the end of the line is a '*'. 364 */ 365 while (*s && *s != '\n') 366 s++; 367 p_indent = indent; 368 p_start = previous_line; 369 p_sline = p_input_line - 1; 370 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 371 goto scan_exit; 372 } 373 if ((!diff_type || diff_type == NORMAL_DIFF) && 374 last_line_was_command && 375 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 376 p_start = previous_line; 377 p_sline = p_input_line - 1; 378 p_indent = indent; 379 retval = NORMAL_DIFF; 380 goto scan_exit; 381 } 382 } 383 scan_exit: 384 if (retval == UNI_DIFF) { 385 /* unswap old and new */ 386 struct file_name tmp = names[OLD_FILE]; 387 names[OLD_FILE] = names[NEW_FILE]; 388 names[NEW_FILE] = tmp; 389 } 390 if (filearg[0] == NULL) { 391 if (posix) 392 filearg[0] = posix_name(names, ok_to_create_file); 393 else { 394 /* Ignore the Index: name for context diffs, like GNU */ 395 if (names[OLD_FILE].path != NULL || 396 names[NEW_FILE].path != NULL) { 397 free(names[INDEX_FILE].path); 398 names[INDEX_FILE].path = NULL; 399 } 400 filearg[0] = best_name(names, ok_to_create_file); 401 } 402 } 403 404 free(bestguess); 405 bestguess = NULL; 406 if (filearg[0] != NULL) 407 bestguess = xstrdup(filearg[0]); 408 else if (!ok_to_create_file) { 409 /* 410 * We don't want to create a new file but we need a 411 * filename to set bestguess. Avoid setting filearg[0] 412 * so the file is not created automatically. 413 */ 414 if (posix) 415 bestguess = posix_name(names, true); 416 else 417 bestguess = best_name(names, true); 418 } 419 free(names[OLD_FILE].path); 420 free(names[NEW_FILE].path); 421 free(names[INDEX_FILE].path); 422 return retval; 423 } 424 425 /* 426 * Remember where this patch ends so we know where to start up again. 427 */ 428 static void 429 next_intuit_at(off_t file_pos, LINENUM file_line) 430 { 431 p_base = file_pos; 432 p_bline = file_line; 433 } 434 435 /* 436 * Basically a verbose fseeko() to the actual diff listing. 437 */ 438 static void 439 skip_to(off_t file_pos, LINENUM file_line) 440 { 441 size_t len; 442 443 if (p_base > file_pos) 444 fatal("Internal error: seek %lld>%lld\n", 445 (long long)p_base, (long long)file_pos); 446 if (verbose && p_base < file_pos) { 447 fseeko(pfp, p_base, SEEK_SET); 448 say("The text leading up to this was:\n--------------------------\n"); 449 while (ftello(pfp) < file_pos) { 450 len = pgets(false); 451 if (len == 0) 452 fatal("Unexpected end of file\n"); 453 say("|%s", buf); 454 } 455 say("--------------------------\n"); 456 } else 457 fseeko(pfp, file_pos, SEEK_SET); 458 p_input_line = file_line - 1; 459 } 460 461 /* Make this a function for better debugging. */ 462 static void 463 malformed(void) 464 { 465 fatal("malformed patch at line %ld: %s", p_input_line, buf); 466 /* about as informative as "Syntax error" in C */ 467 } 468 469 /* 470 * True if the line has been discarded (i.e. it is a line saying 471 * "\ No newline at end of file".) 472 */ 473 static bool 474 remove_special_line(void) 475 { 476 int c; 477 478 c = fgetc(pfp); 479 if (c == '\\') { 480 do { 481 c = fgetc(pfp); 482 } while (c != EOF && c != '\n'); 483 484 return true; 485 } 486 if (c != EOF) 487 fseeko(pfp, -1, SEEK_CUR); 488 489 return false; 490 } 491 492 /* 493 * True if there is more of the current diff listing to process. 494 */ 495 bool 496 another_hunk(void) 497 { 498 off_t line_beginning; /* file pos of the current line */ 499 LINENUM repl_beginning; /* index of --- line */ 500 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 501 LINENUM fillsrc; /* index of first line to copy */ 502 LINENUM filldst; /* index of first missing line */ 503 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 504 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 505 bool repl_missing; /* we are now backtracking */ 506 off_t repl_backtrack_position; /* file pos of first repl line */ 507 LINENUM repl_patch_line; /* input line number for same */ 508 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 509 char *s; 510 size_t len; 511 int context = 0; 512 513 while (p_end >= 0) { 514 if (p_end == p_efake) 515 p_end = p_bfake; /* don't free twice */ 516 else 517 free(p_line[p_end]); 518 p_end--; 519 } 520 p_efake = -1; 521 522 p_max = hunkmax; /* gets reduced when --- found */ 523 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 524 line_beginning = ftello(pfp); 525 repl_beginning = 0; 526 fillcnt = 0; 527 fillsrc = 0; 528 filldst = 0; 529 ptrn_spaces_eaten = false; 530 repl_could_be_missing = true; 531 repl_missing = false; 532 repl_backtrack_position = 0; 533 repl_patch_line = 0; 534 ptrn_copiable = 0; 535 536 len = pgets(true); 537 p_input_line++; 538 if (len == 0 || strnNE(buf, "********", 8)) { 539 next_intuit_at(line_beginning, p_input_line); 540 return false; 541 } 542 p_context = 100; 543 p_hunk_beg = p_input_line + 1; 544 while (p_end < p_max) { 545 line_beginning = ftello(pfp); 546 len = pgets(true); 547 p_input_line++; 548 if (len == 0) { 549 if (p_max - p_end < 4) { 550 /* assume blank lines got chopped */ 551 strlcpy(buf, " \n", buf_size); 552 } else { 553 if (repl_beginning && repl_could_be_missing) { 554 repl_missing = true; 555 goto hunk_done; 556 } 557 fatal("unexpected end of file in patch\n"); 558 } 559 } 560 p_end++; 561 if (p_end >= hunkmax) 562 fatal("Internal error: hunk larger than hunk " 563 "buffer size"); 564 p_char[p_end] = *buf; 565 p_line[p_end] = NULL; 566 switch (*buf) { 567 case '*': 568 if (strnEQ(buf, "********", 8)) { 569 if (repl_beginning && repl_could_be_missing) { 570 repl_missing = true; 571 goto hunk_done; 572 } else 573 fatal("unexpected end of hunk " 574 "at line %ld\n", 575 p_input_line); 576 } 577 if (p_end != 0) { 578 if (repl_beginning && repl_could_be_missing) { 579 repl_missing = true; 580 goto hunk_done; 581 } 582 fatal("unexpected *** at line %ld: %s", 583 p_input_line, buf); 584 } 585 context = 0; 586 p_line[p_end] = savestr(buf); 587 if (out_of_mem) { 588 p_end--; 589 return false; 590 } 591 for (s = buf; 592 *s && !isdigit((unsigned char)*s); s++) 593 ; 594 if (!*s) 595 malformed(); 596 if (strnEQ(s, "0,0", 3)) 597 memmove(s, s + 2, strlen(s + 2) + 1); 598 p_first = strtolinenum(s, &s); 599 if (*s == ',') { 600 for (; 601 *s && !isdigit((unsigned char)*s); s++) 602 ; 603 if (!*s) 604 malformed(); 605 p_ptrn_lines = strtolinenum(s, &s) - p_first + 1; 606 if (p_ptrn_lines < 0) 607 malformed(); 608 } else if (p_first) 609 p_ptrn_lines = 1; 610 else { 611 p_ptrn_lines = 0; 612 p_first = 1; 613 } 614 if (p_first >= LINENUM_MAX - p_ptrn_lines || 615 p_ptrn_lines >= LINENUM_MAX - 6) 616 malformed(); 617 618 /* we need this much at least */ 619 p_max = p_ptrn_lines + 6; 620 while (p_max >= hunkmax) 621 grow_hunkmax(); 622 p_max = hunkmax; 623 break; 624 case '-': 625 if (buf[1] == '-') { 626 if (repl_beginning || 627 (p_end != p_ptrn_lines + 1 + 628 (p_char[p_end - 1] == '\n'))) { 629 if (p_end == 1) { 630 /* 631 * `old' lines were omitted; 632 * set up to fill them in 633 * from 'new' context lines. 634 */ 635 p_end = p_ptrn_lines + 1; 636 fillsrc = p_end + 1; 637 filldst = 1; 638 fillcnt = p_ptrn_lines; 639 } else { 640 if (repl_beginning) { 641 if (repl_could_be_missing) { 642 repl_missing = true; 643 goto hunk_done; 644 } 645 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 646 p_input_line, p_hunk_beg + repl_beginning); 647 } else { 648 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 649 (p_end <= p_ptrn_lines 650 ? "Premature" 651 : "Overdue"), 652 p_input_line, p_hunk_beg); 653 } 654 } 655 } 656 repl_beginning = p_end; 657 repl_backtrack_position = ftello(pfp); 658 repl_patch_line = p_input_line; 659 p_line[p_end] = savestr(buf); 660 if (out_of_mem) { 661 p_end--; 662 return false; 663 } 664 p_char[p_end] = '='; 665 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 666 ; 667 if (!*s) 668 malformed(); 669 p_newfirst = strtolinenum(s, &s); 670 if (*s == ',') { 671 for (; *s && !isdigit((unsigned char)*s); s++) 672 ; 673 if (!*s) 674 malformed(); 675 p_repl_lines = strtolinenum(s, &s) - 676 p_newfirst + 1; 677 if (p_repl_lines < 0) 678 malformed(); 679 } else if (p_newfirst) 680 p_repl_lines = 1; 681 else { 682 p_repl_lines = 0; 683 p_newfirst = 1; 684 } 685 if (p_newfirst >= LINENUM_MAX - p_repl_lines || 686 p_repl_lines >= LINENUM_MAX - p_end) 687 malformed(); 688 p_max = p_repl_lines + p_end; 689 if (p_max > MAXHUNKSIZE) 690 fatal("hunk too large (%ld lines) at line %ld: %s", 691 p_max, p_input_line, buf); 692 while (p_max >= hunkmax) 693 grow_hunkmax(); 694 if (p_repl_lines != ptrn_copiable && 695 (p_context != 0 || p_repl_lines != 1)) 696 repl_could_be_missing = false; 697 break; 698 } 699 goto change_line; 700 case '+': 701 case '!': 702 repl_could_be_missing = false; 703 change_line: 704 if (buf[1] == '\n' && canonicalize) 705 strlcpy(buf + 1, " \n", buf_size - 1); 706 if (!isspace((unsigned char)buf[1]) && 707 buf[1] != '>' && buf[1] != '<' && 708 repl_beginning && repl_could_be_missing) { 709 repl_missing = true; 710 goto hunk_done; 711 } 712 if (context >= 0) { 713 if (context < p_context) 714 p_context = context; 715 context = -1000; 716 } 717 p_line[p_end] = savestr(buf + 2); 718 if (out_of_mem) { 719 p_end--; 720 return false; 721 } 722 if (p_end == p_ptrn_lines) { 723 if (remove_special_line()) { 724 int l; 725 726 l = strlen(p_line[p_end]) - 1; 727 (p_line[p_end])[l] = 0; 728 } 729 } 730 break; 731 case '\t': 732 case '\n': /* assume the 2 spaces got eaten */ 733 if (repl_beginning && repl_could_be_missing && 734 (!ptrn_spaces_eaten || 735 diff_type == NEW_CONTEXT_DIFF)) { 736 repl_missing = true; 737 goto hunk_done; 738 } 739 p_line[p_end] = savestr(buf); 740 if (out_of_mem) { 741 p_end--; 742 return false; 743 } 744 if (p_end != p_ptrn_lines + 1) { 745 ptrn_spaces_eaten |= (repl_beginning != 0); 746 context++; 747 if (!repl_beginning) 748 ptrn_copiable++; 749 p_char[p_end] = ' '; 750 } 751 break; 752 case ' ': 753 if (!isspace((unsigned char)buf[1]) && 754 repl_beginning && repl_could_be_missing) { 755 repl_missing = true; 756 goto hunk_done; 757 } 758 context++; 759 if (!repl_beginning) 760 ptrn_copiable++; 761 p_line[p_end] = savestr(buf + 2); 762 if (out_of_mem) { 763 p_end--; 764 return false; 765 } 766 break; 767 default: 768 if (repl_beginning && repl_could_be_missing) { 769 repl_missing = true; 770 goto hunk_done; 771 } 772 malformed(); 773 } 774 /* set up p_len for strncmp() so we don't have to */ 775 /* assume null termination */ 776 if (p_line[p_end]) 777 p_len[p_end] = strlen(p_line[p_end]); 778 else 779 p_len[p_end] = 0; 780 } 781 782 hunk_done: 783 if (p_end >= 0 && !repl_beginning) 784 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 785 786 if (repl_missing) { 787 788 /* reset state back to just after --- */ 789 p_input_line = repl_patch_line; 790 for (p_end--; p_end > repl_beginning; p_end--) 791 free(p_line[p_end]); 792 fseeko(pfp, repl_backtrack_position, SEEK_SET); 793 794 /* redundant 'new' context lines were omitted - set */ 795 /* up to fill them in from the old file context */ 796 if (!p_context && p_repl_lines == 1) { 797 p_repl_lines = 0; 798 p_max--; 799 } 800 fillsrc = 1; 801 filldst = repl_beginning + 1; 802 fillcnt = p_repl_lines; 803 p_end = p_max; 804 } else if (!p_context && fillcnt == 1) { 805 /* the first hunk was a null hunk with no context */ 806 /* and we were expecting one line -- fix it up. */ 807 while (filldst < p_end) { 808 p_line[filldst] = p_line[filldst + 1]; 809 p_char[filldst] = p_char[filldst + 1]; 810 p_len[filldst] = p_len[filldst + 1]; 811 filldst++; 812 } 813 #if 0 814 repl_beginning--; /* this doesn't need to be fixed */ 815 #endif 816 p_end--; 817 p_first++; /* do append rather than insert */ 818 fillcnt = 0; 819 p_ptrn_lines = 0; 820 } 821 if (diff_type == CONTEXT_DIFF && 822 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 823 if (verbose) 824 say("%s\n%s\n%s\n", 825 "(Fascinating--this is really a new-style context diff but without", 826 "the telltale extra asterisks on the *** line that usually indicate", 827 "the new style...)"); 828 diff_type = NEW_CONTEXT_DIFF; 829 } 830 /* if there were omitted context lines, fill them in now */ 831 if (fillcnt) { 832 p_bfake = filldst; /* remember where not to free() */ 833 p_efake = filldst + fillcnt - 1; 834 while (fillcnt-- > 0) { 835 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 836 fillsrc++; 837 if (fillsrc > p_end) 838 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 839 p_hunk_beg); 840 p_line[filldst] = p_line[fillsrc]; 841 p_char[filldst] = p_char[fillsrc]; 842 p_len[filldst] = p_len[fillsrc]; 843 fillsrc++; 844 filldst++; 845 } 846 while (fillsrc <= p_end && fillsrc != repl_beginning && 847 p_char[fillsrc] != ' ') 848 fillsrc++; 849 #ifdef DEBUGGING 850 if (debug & 64) 851 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 852 fillsrc, filldst, repl_beginning, p_end + 1); 853 #endif 854 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 855 malformed(); 856 if (filldst != p_end + 1 && filldst != repl_beginning) 857 malformed(); 858 } 859 if (p_line[p_end] != NULL) { 860 if (remove_special_line()) { 861 p_len[p_end] -= 1; 862 (p_line[p_end])[p_len[p_end]] = 0; 863 } 864 } 865 } else if (diff_type == UNI_DIFF) { 866 LINENUM fillold; /* index of old lines */ 867 LINENUM fillnew; /* index of new lines */ 868 char ch; 869 870 line_beginning = ftello(pfp); /* file pos of the current line */ 871 len = pgets(true); 872 p_input_line++; 873 if (len == 0 || strnNE(buf, "@@ -", 4)) { 874 next_intuit_at(line_beginning, p_input_line); 875 return false; 876 } 877 s = buf + 4; 878 if (!*s) 879 malformed(); 880 p_first = strtolinenum(s, &s); 881 if (*s == ',') { 882 p_ptrn_lines = strtolinenum(s + 1, &s); 883 } else 884 p_ptrn_lines = 1; 885 if (*s == ' ') 886 s++; 887 if (*s != '+' || !*++s) 888 malformed(); 889 p_newfirst = strtolinenum(s, &s); 890 if (*s == ',') { 891 p_repl_lines = strtolinenum(s + 1, &s); 892 } else 893 p_repl_lines = 1; 894 if (*s == ' ') 895 s++; 896 if (*s != '@') 897 malformed(); 898 if (p_first >= LINENUM_MAX - p_ptrn_lines || 899 p_newfirst > LINENUM_MAX - p_repl_lines || 900 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 901 malformed(); 902 if (!p_ptrn_lines) 903 p_first++; /* do append rather than insert */ 904 p_max = p_ptrn_lines + p_repl_lines + 1; 905 while (p_max >= hunkmax) 906 grow_hunkmax(); 907 fillold = 1; 908 fillnew = fillold + p_ptrn_lines; 909 p_end = fillnew + p_repl_lines; 910 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 911 p_first + p_ptrn_lines - 1); 912 p_line[0] = savestr(buf); 913 if (out_of_mem) { 914 p_end = -1; 915 return false; 916 } 917 p_char[0] = '*'; 918 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 919 p_newfirst + p_repl_lines - 1); 920 p_line[fillnew] = savestr(buf); 921 if (out_of_mem) { 922 p_end = 0; 923 return false; 924 } 925 p_char[fillnew++] = '='; 926 p_context = 100; 927 context = 0; 928 p_hunk_beg = p_input_line + 1; 929 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 930 line_beginning = ftello(pfp); 931 len = pgets(true); 932 p_input_line++; 933 if (len == 0) { 934 if (p_max - fillnew < 3) { 935 /* assume blank lines got chopped */ 936 strlcpy(buf, " \n", buf_size); 937 } else { 938 fatal("unexpected end of file in patch\n"); 939 } 940 } 941 if (*buf == '\t' || *buf == '\n') { 942 ch = ' '; /* assume the space got eaten */ 943 s = savestr(buf); 944 } else { 945 ch = *buf; 946 s = savestr(buf + 1); 947 } 948 if (out_of_mem) { 949 while (--fillnew > p_ptrn_lines) 950 free(p_line[fillnew]); 951 p_end = fillold - 1; 952 return false; 953 } 954 switch (ch) { 955 case '-': 956 if (fillold > p_ptrn_lines) { 957 free(s); 958 p_end = fillnew - 1; 959 malformed(); 960 } 961 p_char[fillold] = ch; 962 p_line[fillold] = s; 963 p_len[fillold++] = strlen(s); 964 if (fillold > p_ptrn_lines) { 965 if (remove_special_line()) { 966 p_len[fillold - 1] -= 1; 967 s[p_len[fillold - 1]] = 0; 968 } 969 } 970 break; 971 case '=': 972 ch = ' '; 973 /* FALL THROUGH */ 974 case ' ': 975 if (fillold > p_ptrn_lines) { 976 free(s); 977 while (--fillnew > p_ptrn_lines) 978 free(p_line[fillnew]); 979 p_end = fillold - 1; 980 malformed(); 981 } 982 context++; 983 p_char[fillold] = ch; 984 p_line[fillold] = s; 985 p_len[fillold++] = strlen(s); 986 s = savestr(s); 987 if (out_of_mem) { 988 while (--fillnew > p_ptrn_lines) 989 free(p_line[fillnew]); 990 p_end = fillold - 1; 991 return false; 992 } 993 if (fillold > p_ptrn_lines) { 994 if (remove_special_line()) { 995 p_len[fillold - 1] -= 1; 996 s[p_len[fillold - 1]] = 0; 997 } 998 } 999 /* FALL THROUGH */ 1000 case '+': 1001 if (fillnew > p_end) { 1002 free(s); 1003 while (--fillnew > p_ptrn_lines) 1004 free(p_line[fillnew]); 1005 p_end = fillold - 1; 1006 malformed(); 1007 } 1008 p_char[fillnew] = ch; 1009 p_line[fillnew] = s; 1010 p_len[fillnew++] = strlen(s); 1011 if (fillold > p_ptrn_lines) { 1012 if (remove_special_line()) { 1013 p_len[fillnew - 1] -= 1; 1014 s[p_len[fillnew - 1]] = 0; 1015 } 1016 } 1017 break; 1018 default: 1019 p_end = fillnew; 1020 malformed(); 1021 } 1022 if (ch != ' ' && context > 0) { 1023 if (context < p_context) 1024 p_context = context; 1025 context = -1000; 1026 } 1027 } /* while */ 1028 } else { /* normal diff--fake it up */ 1029 char hunk_type; 1030 int i; 1031 LINENUM min, max; 1032 1033 line_beginning = ftello(pfp); 1034 p_context = 0; 1035 len = pgets(true); 1036 p_input_line++; 1037 if (len == 0 || !isdigit((unsigned char)*buf)) { 1038 next_intuit_at(line_beginning, p_input_line); 1039 return false; 1040 } 1041 p_first = strtolinenum(buf, &s); 1042 if (*s == ',') { 1043 p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1; 1044 if (p_ptrn_lines < 0) 1045 malformed(); 1046 } else 1047 p_ptrn_lines = (*s != 'a'); 1048 hunk_type = *s; 1049 if (hunk_type == 'a') 1050 p_first++; /* do append rather than insert */ 1051 min = strtolinenum(s + 1, &s); 1052 if (*s == ',') 1053 max = strtolinenum(s + 1, &s); 1054 else 1055 max = min; 1056 if (min < 0 || min > max || max - min == LINENUM_MAX) 1057 malformed(); 1058 if (hunk_type == 'd') 1059 min++; 1060 p_newfirst = min; 1061 p_repl_lines = max - min + 1; 1062 if (p_newfirst > LINENUM_MAX - p_repl_lines || 1063 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1064 malformed(); 1065 p_end = p_ptrn_lines + p_repl_lines + 1; 1066 if (p_end > MAXHUNKSIZE) 1067 fatal("hunk too large (%ld lines) at line %ld: %s", 1068 p_end, p_input_line, buf); 1069 while (p_end >= hunkmax) 1070 grow_hunkmax(); 1071 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1072 p_first + p_ptrn_lines - 1); 1073 p_line[0] = savestr(buf); 1074 if (out_of_mem) { 1075 p_end = -1; 1076 return false; 1077 } 1078 p_char[0] = '*'; 1079 for (i = 1; i <= p_ptrn_lines; i++) { 1080 len = pgets(true); 1081 p_input_line++; 1082 if (len == 0) 1083 fatal("unexpected end of file in patch at line %ld\n", 1084 p_input_line); 1085 if (*buf != '<') 1086 fatal("< expected at line %ld of patch\n", 1087 p_input_line); 1088 p_line[i] = savestr(buf + 2); 1089 if (out_of_mem) { 1090 p_end = i - 1; 1091 return false; 1092 } 1093 p_len[i] = strlen(p_line[i]); 1094 p_char[i] = '-'; 1095 } 1096 1097 if (remove_special_line()) { 1098 p_len[i - 1] -= 1; 1099 (p_line[i - 1])[p_len[i - 1]] = 0; 1100 } 1101 if (hunk_type == 'c') { 1102 len = pgets(true); 1103 p_input_line++; 1104 if (len == 0) 1105 fatal("unexpected end of file in patch at line %ld\n", 1106 p_input_line); 1107 if (*buf != '-') 1108 fatal("--- expected at line %ld of patch\n", 1109 p_input_line); 1110 } 1111 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1112 p_line[i] = savestr(buf); 1113 if (out_of_mem) { 1114 p_end = i - 1; 1115 return false; 1116 } 1117 p_char[i] = '='; 1118 for (i++; i <= p_end; i++) { 1119 len = pgets(true); 1120 p_input_line++; 1121 if (len == 0) 1122 fatal("unexpected end of file in patch at line %ld\n", 1123 p_input_line); 1124 if (*buf != '>') 1125 fatal("> expected at line %ld of patch\n", 1126 p_input_line); 1127 p_line[i] = savestr(buf + 2); 1128 if (out_of_mem) { 1129 p_end = i - 1; 1130 return false; 1131 } 1132 p_len[i] = strlen(p_line[i]); 1133 p_char[i] = '+'; 1134 } 1135 1136 if (remove_special_line()) { 1137 p_len[i - 1] -= 1; 1138 (p_line[i - 1])[p_len[i - 1]] = 0; 1139 } 1140 } 1141 if (reverse) /* backwards patch? */ 1142 if (!pch_swap()) 1143 say("Not enough memory to swap next hunk!\n"); 1144 #ifdef DEBUGGING 1145 if (debug & 2) { 1146 int i; 1147 char special; 1148 1149 for (i = 0; i <= p_end; i++) { 1150 if (i == p_ptrn_lines) 1151 special = '^'; 1152 else 1153 special = ' '; 1154 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1155 special, p_line[i]); 1156 fflush(stderr); 1157 } 1158 } 1159 #endif 1160 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1161 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1162 return true; 1163 } 1164 1165 /* 1166 * Input a line from the patch file. 1167 * Worry about indentation if do_indent is true. 1168 * The line is read directly into the buf global variable which 1169 * is resized if necessary in order to hold the complete line. 1170 * Returns the number of characters read including the terminating 1171 * '\n', if any. 1172 */ 1173 size_t 1174 pgets(bool do_indent) 1175 { 1176 char *line; 1177 size_t len; 1178 int indent = 0, skipped = 0; 1179 1180 line = fgetln(pfp, &len); 1181 if (line != NULL) { 1182 if (len + 1 > buf_size) { 1183 while (len + 1 > buf_size) 1184 buf_size *= 2; 1185 free(buf); 1186 buf = malloc(buf_size); 1187 if (buf == NULL) 1188 fatal("out of memory\n"); 1189 } 1190 if (do_indent == 1 && p_indent) { 1191 for (; 1192 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1193 line++, skipped++) { 1194 if (*line == '\t') 1195 indent += 8 - (indent %7); 1196 else 1197 indent++; 1198 } 1199 } 1200 memcpy(buf, line, len - skipped); 1201 buf[len - skipped] = '\0'; 1202 } 1203 return len; 1204 } 1205 1206 1207 /* 1208 * Reverse the old and new portions of the current hunk. 1209 */ 1210 bool 1211 pch_swap(void) 1212 { 1213 char **tp_line; /* the text of the hunk */ 1214 unsigned short *tp_len;/* length of each line */ 1215 char *tp_char; /* +, -, and ! */ 1216 LINENUM i; 1217 LINENUM n; 1218 bool blankline = false; 1219 char *s; 1220 1221 i = p_first; 1222 p_first = p_newfirst; 1223 p_newfirst = i; 1224 1225 /* make a scratch copy */ 1226 1227 tp_line = p_line; 1228 tp_len = p_len; 1229 tp_char = p_char; 1230 p_line = NULL; /* force set_hunkmax to allocate again */ 1231 p_len = NULL; 1232 p_char = NULL; 1233 set_hunkmax(); 1234 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1235 1236 free(p_line); 1237 p_line = tp_line; 1238 free(p_len); 1239 p_len = tp_len; 1240 free(p_char); 1241 p_char = tp_char; 1242 return false; /* not enough memory to swap hunk! */ 1243 } 1244 /* now turn the new into the old */ 1245 1246 i = p_ptrn_lines + 1; 1247 if (tp_char[i] == '\n') { /* account for possible blank line */ 1248 blankline = true; 1249 i++; 1250 } 1251 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1252 if (p_efake <= i) 1253 n = p_end - i + 1; 1254 else 1255 n = -i; 1256 p_efake += n; 1257 p_bfake += n; 1258 } 1259 for (n = 0; i <= p_end; i++, n++) { 1260 p_line[n] = tp_line[i]; 1261 p_char[n] = tp_char[i]; 1262 if (p_char[n] == '+') 1263 p_char[n] = '-'; 1264 p_len[n] = tp_len[i]; 1265 } 1266 if (blankline) { 1267 i = p_ptrn_lines + 1; 1268 p_line[n] = tp_line[i]; 1269 p_char[n] = tp_char[i]; 1270 p_len[n] = tp_len[i]; 1271 n++; 1272 } 1273 if (p_char[0] != '=') 1274 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1275 p_input_line, p_char[0]); 1276 p_char[0] = '*'; 1277 for (s = p_line[0]; *s; s++) 1278 if (*s == '-') 1279 *s = '*'; 1280 1281 /* now turn the old into the new */ 1282 1283 if (p_char[0] != '*') 1284 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1285 p_input_line, p_char[0]); 1286 tp_char[0] = '='; 1287 for (s = tp_line[0]; *s; s++) 1288 if (*s == '*') 1289 *s = '-'; 1290 for (i = 0; n <= p_end; i++, n++) { 1291 p_line[n] = tp_line[i]; 1292 p_char[n] = tp_char[i]; 1293 if (p_char[n] == '-') 1294 p_char[n] = '+'; 1295 p_len[n] = tp_len[i]; 1296 } 1297 1298 if (i != p_ptrn_lines + 1) 1299 fatal("Malformed patch at line %ld: expected %ld lines, " 1300 "got %ld\n", 1301 p_input_line, p_ptrn_lines + 1, i); 1302 1303 i = p_ptrn_lines; 1304 p_ptrn_lines = p_repl_lines; 1305 p_repl_lines = i; 1306 1307 free(tp_line); 1308 free(tp_len); 1309 free(tp_char); 1310 1311 return true; 1312 } 1313 1314 /* 1315 * Return the specified line position in the old file of the old context. 1316 */ 1317 LINENUM 1318 pch_first(void) 1319 { 1320 return p_first; 1321 } 1322 1323 /* 1324 * Return the number of lines of old context. 1325 */ 1326 LINENUM 1327 pch_ptrn_lines(void) 1328 { 1329 return p_ptrn_lines; 1330 } 1331 1332 /* 1333 * Return the probable line position in the new file of the first line. 1334 */ 1335 LINENUM 1336 pch_newfirst(void) 1337 { 1338 return p_newfirst; 1339 } 1340 1341 /* 1342 * Return the number of lines in the replacement text including context. 1343 */ 1344 LINENUM 1345 pch_repl_lines(void) 1346 { 1347 return p_repl_lines; 1348 } 1349 1350 /* 1351 * Return the number of lines in the whole hunk. 1352 */ 1353 LINENUM 1354 pch_end(void) 1355 { 1356 return p_end; 1357 } 1358 1359 /* 1360 * Return the number of context lines before the first changed line. 1361 */ 1362 LINENUM 1363 pch_context(void) 1364 { 1365 return p_context; 1366 } 1367 1368 /* 1369 * Return the length of a particular patch line. 1370 */ 1371 unsigned short 1372 pch_line_len(LINENUM line) 1373 { 1374 return p_len[line]; 1375 } 1376 1377 /* 1378 * Return the control character (+, -, *, !, etc) for a patch line. 1379 */ 1380 char 1381 pch_char(LINENUM line) 1382 { 1383 return p_char[line]; 1384 } 1385 1386 /* 1387 * Return a pointer to a particular patch line. 1388 */ 1389 char * 1390 pfetch(LINENUM line) 1391 { 1392 return p_line[line]; 1393 } 1394 1395 /* 1396 * Return where in the patch file this hunk began, for error messages. 1397 */ 1398 LINENUM 1399 pch_hunk_beg(void) 1400 { 1401 return p_hunk_beg; 1402 } 1403 1404 /* 1405 * Apply an ed script by feeding ed itself. 1406 */ 1407 void 1408 do_ed_script(void) 1409 { 1410 char *t; 1411 off_t beginning_of_this_line; 1412 FILE *pipefp = NULL; 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_ED, 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 != 'd') { 1438 while (pgets(true)) { 1439 p_input_line++; 1440 if (pipefp != NULL) 1441 fputs(buf, pipefp); 1442 if (strEQ(buf, ".\n")) 1443 break; 1444 } 1445 } 1446 } else { 1447 next_intuit_at(beginning_of_this_line, p_input_line); 1448 break; 1449 } 1450 } 1451 if (pipefp == NULL) 1452 return; 1453 fprintf(pipefp, "w\n"); 1454 fprintf(pipefp, "q\n"); 1455 fflush(pipefp); 1456 pclose(pipefp); 1457 ignore_signals(); 1458 if (!check_only) { 1459 if (move_file(TMPOUTNAME, outname) < 0) { 1460 toutkeep = true; 1461 chmod(TMPOUTNAME, filemode); 1462 } else 1463 chmod(outname, filemode); 1464 } 1465 set_signals(1); 1466 } 1467 1468 /* 1469 * Choose the name of the file to be patched based on POSIX rules. 1470 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1471 * if the user specified --posix or set POSIXLY_CORRECT. 1472 */ 1473 static char * 1474 posix_name(const struct file_name *names, bool assume_exists) 1475 { 1476 char *path = NULL; 1477 int i; 1478 1479 /* 1480 * POSIX states that the filename will be chosen from one 1481 * of the old, new and index names (in that order) if 1482 * the file exists relative to CWD after -p stripping. 1483 */ 1484 for (i = 0; i < MAX_FILE; i++) { 1485 if (names[i].path != NULL && names[i].exists) { 1486 path = names[i].path; 1487 break; 1488 } 1489 } 1490 if (path == NULL && !assume_exists) { 1491 /* 1492 * No files found, look for something we can checkout from 1493 * RCS/SCCS dirs. Same order as above. 1494 */ 1495 for (i = 0; i < MAX_FILE; i++) { 1496 if (names[i].path != NULL && 1497 (path = checked_in(names[i].path)) != NULL) 1498 break; 1499 } 1500 /* 1501 * Still no match? Check to see if the diff could be creating 1502 * a new file. 1503 */ 1504 if (path == NULL && ok_to_create_file && 1505 names[NEW_FILE].path != NULL) 1506 path = names[NEW_FILE].path; 1507 } 1508 1509 return path ? xstrdup(path) : NULL; 1510 } 1511 1512 static char * 1513 compare_names(const struct file_name *names, bool assume_exists, int phase) 1514 { 1515 size_t min_components, min_baselen, min_len, tmp; 1516 char *best = NULL; 1517 char *path; 1518 int i; 1519 1520 /* 1521 * The "best" name is the one with the fewest number of path 1522 * components, the shortest basename length, and the shortest 1523 * overall length (in that order). We only use the Index: file 1524 * if neither of the old or new files could be intuited from 1525 * the diff header. 1526 */ 1527 min_components = min_baselen = min_len = SIZE_MAX; 1528 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1529 path = names[i].path; 1530 if (path == NULL || 1531 (phase == 1 && !names[i].exists && !assume_exists) || 1532 (phase == 2 && checked_in(path) == NULL)) 1533 continue; 1534 if ((tmp = num_components(path)) > min_components) 1535 continue; 1536 if (tmp < min_components) { 1537 min_components = tmp; 1538 best = path; 1539 } 1540 if ((tmp = strlen(basename(path))) > min_baselen) 1541 continue; 1542 if (tmp < min_baselen) { 1543 min_baselen = tmp; 1544 best = path; 1545 } 1546 if ((tmp = strlen(path)) > min_len) 1547 continue; 1548 min_len = tmp; 1549 best = path; 1550 } 1551 return best; 1552 } 1553 1554 /* 1555 * Choose the name of the file to be patched based the "best" one 1556 * available. 1557 */ 1558 static char * 1559 best_name(const struct file_name *names, bool assume_exists) 1560 { 1561 char *best; 1562 1563 best = compare_names(names, assume_exists, 1); 1564 if (best == NULL) { 1565 best = compare_names(names, assume_exists, 2); 1566 /* 1567 * Still no match? Check to see if the diff could be creating 1568 * a new file. 1569 */ 1570 if (best == NULL && ok_to_create_file && 1571 names[NEW_FILE].path != NULL) 1572 best = names[NEW_FILE].path; 1573 } 1574 1575 return best ? xstrdup(best) : NULL; 1576 } 1577 1578 static size_t 1579 num_components(const char *path) 1580 { 1581 size_t n; 1582 const char *cp; 1583 1584 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1585 while (*cp == '/') 1586 cp++; /* skip consecutive slashes */ 1587 } 1588 return n; 1589 } 1590 1591 /* 1592 * Convert number at NPTR into LINENUM and save address of first 1593 * character that is not a digit in ENDPTR. If conversion is not 1594 * possible, call fatal. 1595 */ 1596 static LINENUM 1597 strtolinenum(char *nptr, char **endptr) 1598 { 1599 LINENUM rv; 1600 char c; 1601 char *p; 1602 const char *errstr; 1603 1604 for (p = nptr; isdigit((unsigned char)*p); p++) 1605 ; 1606 1607 if (p == nptr) 1608 malformed(); 1609 1610 c = *p; 1611 *p = '\0'; 1612 1613 rv = strtonum(nptr, 0, LINENUM_MAX, &errstr); 1614 if (errstr != NULL) 1615 fatal("invalid line number at line %ld: `%s' is %s\n", 1616 p_input_line, nptr, errstr); 1617 1618 *p = c; 1619 *endptr = p; 1620 1621 return rv; 1622 } 1623