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 (p_filesize == 0) 183 return false; 184 nonempty_patchf_seen = true; 185 if (verbose) 186 say("Hmm..."); 187 diff_type = intuit_diff_type(); 188 if (!diff_type) { 189 if (p_base != 0) { 190 if (verbose) 191 say(" Ignoring the trailing garbage.\ndone\n"); 192 } else 193 say(" I can't seem to find a patch in there anywhere.\n"); 194 return false; 195 } 196 if (verbose) 197 say(" %sooks like %s to me...\n", 198 (p_base == 0 ? "L" : "The next patch l"), 199 diff_type == UNI_DIFF ? "a unified diff" : 200 diff_type == CONTEXT_DIFF ? "a context diff" : 201 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 202 diff_type == NORMAL_DIFF ? "a normal diff" : 203 "an ed script"); 204 if (p_indent && verbose) 205 say("(Patch is indented %d space%s.)\n", p_indent, 206 p_indent == 1 ? "" : "s"); 207 skip_to(p_start, p_sline); 208 while (filearg[0] == NULL) { 209 if (force || batch) { 210 say("No file to patch. Skipping...\n"); 211 filearg[0] = xstrdup(bestguess); 212 skip_rest_of_patch = true; 213 return true; 214 } 215 ask("File to patch: "); 216 if (*buf != '\n') { 217 free(bestguess); 218 bestguess = xstrdup(buf); 219 filearg[0] = fetchname(buf, &exists, 0); 220 } 221 if (!exists) { 222 int def_skip = *bestguess == '\0'; 223 ask("No file found--skip this patch? [%c] ", 224 def_skip ? 'y' : 'n'); 225 if (*buf == 'n' || (!def_skip && *buf != 'y')) 226 continue; 227 if (verbose) 228 say("Skipping patch...\n"); 229 free(filearg[0]); 230 filearg[0] = fetchname(bestguess, &exists, 0); 231 skip_rest_of_patch = true; 232 return true; 233 } 234 } 235 return true; 236 } 237 238 static void 239 p4_fetchname(struct file_name *name, char *str) 240 { 241 char *t, *h; 242 243 /* Skip leading whitespace. */ 244 while (isspace((unsigned char)*str)) 245 str++; 246 247 /* Remove the file revision number. */ 248 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 249 if (*t == '#') 250 h = t; 251 if (h != NULL) 252 *h = '\0'; 253 254 name->path = fetchname(str, &name->exists, strippath); 255 } 256 257 /* Determine what kind of diff is in the remaining part of the patch file. */ 258 259 static int 260 intuit_diff_type(void) 261 { 262 off_t this_line = 0, previous_line; 263 off_t first_command_line = -1; 264 LINENUM fcl_line = -1; 265 bool last_line_was_command = false, this_is_a_command = false; 266 bool stars_last_line = false, stars_this_line = false; 267 char *s, *t; 268 int indent, retval; 269 struct file_name names[MAX_FILE]; 270 int piece_of_git = 0; 271 272 memset(names, 0, sizeof(names)); 273 ok_to_create_file = false; 274 fseeko(pfp, p_base, SEEK_SET); 275 p_input_line = p_bline - 1; 276 for (;;) { 277 previous_line = this_line; 278 last_line_was_command = this_is_a_command; 279 stars_last_line = stars_this_line; 280 this_line = ftello(pfp); 281 indent = 0; 282 p_input_line++; 283 if (pgets(false) == 0) { 284 if (first_command_line >= 0) { 285 /* nothing but deletes!? */ 286 p_start = first_command_line; 287 p_sline = fcl_line; 288 retval = ED_DIFF; 289 goto scan_exit; 290 } else { 291 p_start = this_line; 292 p_sline = p_input_line; 293 retval = 0; 294 goto scan_exit; 295 } 296 } 297 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 298 if (*s == '\t') 299 indent += 8 - (indent % 8); 300 else 301 indent++; 302 } 303 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 304 ; 305 this_is_a_command = (isdigit((unsigned char)*s) && 306 (*t == 'd' || *t == 'c' || *t == 'a')); 307 if (first_command_line < 0 && this_is_a_command) { 308 first_command_line = this_line; 309 fcl_line = p_input_line; 310 p_indent = indent; /* assume this for now */ 311 } 312 if (!stars_last_line && strnEQ(s, "*** ", 4)) 313 names[OLD_FILE].path = fetchname(s + 4, 314 &names[OLD_FILE].exists, strippath); 315 else if (strnEQ(s, "--- ", 4)) { 316 size_t off = 4; 317 if (piece_of_git && strippath == 957 && 318 strnEQ(s, "--- a/", 6)) 319 off = 6; 320 names[NEW_FILE].path = fetchname(s + off, 321 &names[NEW_FILE].exists, strippath); 322 } else if (strnEQ(s, "+++ ", 4)) { 323 /* pretend it is the old name */ 324 size_t off = 4; 325 if (piece_of_git && strippath == 957 && 326 strnEQ(s, "+++ b/", 6)) 327 off = 6; 328 names[OLD_FILE].path = fetchname(s + off, 329 &names[OLD_FILE].exists, strippath); 330 } else if (strnEQ(s, "Index:", 6)) 331 names[INDEX_FILE].path = fetchname(s + 6, 332 &names[INDEX_FILE].exists, strippath); 333 else if (strnEQ(s, "Prereq:", 7)) { 334 for (t = s + 7; isspace((unsigned char)*t); t++) 335 ; 336 revision = xstrdup(t); 337 for (t = revision; 338 *t && !isspace((unsigned char)*t); t++) 339 ; 340 *t = '\0'; 341 if (*revision == '\0') { 342 free(revision); 343 revision = NULL; 344 } 345 } else if (strnEQ(s, "diff --git a/", 13)) { 346 /* Git-style diffs. */ 347 piece_of_git = 1; 348 } else if (strnEQ(s, "==== ", 5)) { 349 /* Perforce-style diffs. */ 350 if ((t = strstr(s + 5, " - ")) != NULL) 351 p4_fetchname(&names[NEW_FILE], t + 3); 352 p4_fetchname(&names[OLD_FILE], s + 5); 353 } 354 if ((!diff_type || diff_type == ED_DIFF) && 355 first_command_line >= 0 && 356 strEQ(s, ".\n")) { 357 p_indent = indent; 358 p_start = first_command_line; 359 p_sline = fcl_line; 360 retval = ED_DIFF; 361 goto scan_exit; 362 } 363 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 364 if (strnEQ(s + 4, "0,0", 3)) 365 ok_to_create_file = true; 366 p_indent = indent; 367 p_start = this_line; 368 p_sline = p_input_line; 369 retval = UNI_DIFF; 370 goto scan_exit; 371 } 372 stars_this_line = strnEQ(s, "********", 8); 373 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 374 strnEQ(s, "*** ", 4)) { 375 if (strtolinenum(s + 4, &s) == 0) 376 ok_to_create_file = true; 377 /* 378 * If this is a new context diff the character just 379 * at the end of the line is a '*'. 380 */ 381 while (*s && *s != '\n') 382 s++; 383 p_indent = indent; 384 p_start = previous_line; 385 p_sline = p_input_line - 1; 386 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 387 goto scan_exit; 388 } 389 if ((!diff_type || diff_type == NORMAL_DIFF) && 390 last_line_was_command && 391 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 392 p_start = previous_line; 393 p_sline = p_input_line - 1; 394 p_indent = indent; 395 retval = NORMAL_DIFF; 396 goto scan_exit; 397 } 398 } 399 scan_exit: 400 if (retval == UNI_DIFF) { 401 /* unswap old and new */ 402 struct file_name tmp = names[OLD_FILE]; 403 names[OLD_FILE] = names[NEW_FILE]; 404 names[NEW_FILE] = tmp; 405 } 406 if (filearg[0] == NULL) { 407 if (posix) 408 filearg[0] = posix_name(names, ok_to_create_file); 409 else { 410 /* Ignore the Index: name for context diffs, like GNU */ 411 if (names[OLD_FILE].path != NULL || 412 names[NEW_FILE].path != NULL) { 413 free(names[INDEX_FILE].path); 414 names[INDEX_FILE].path = NULL; 415 } 416 filearg[0] = best_name(names, ok_to_create_file); 417 } 418 } 419 420 free(bestguess); 421 bestguess = NULL; 422 if (filearg[0] != NULL) 423 bestguess = xstrdup(filearg[0]); 424 else if (!ok_to_create_file) { 425 /* 426 * We don't want to create a new file but we need a 427 * filename to set bestguess. Avoid setting filearg[0] 428 * so the file is not created automatically. 429 */ 430 if (posix) 431 bestguess = posix_name(names, true); 432 else 433 bestguess = best_name(names, true); 434 } 435 free(names[OLD_FILE].path); 436 free(names[NEW_FILE].path); 437 free(names[INDEX_FILE].path); 438 return retval; 439 } 440 441 /* 442 * Remember where this patch ends so we know where to start up again. 443 */ 444 static void 445 next_intuit_at(off_t file_pos, LINENUM file_line) 446 { 447 p_base = file_pos; 448 p_bline = file_line; 449 } 450 451 /* 452 * Basically a verbose fseeko() to the actual diff listing. 453 */ 454 static void 455 skip_to(off_t file_pos, LINENUM file_line) 456 { 457 size_t len; 458 459 if (p_base > file_pos) 460 fatal("Internal error: seek %lld>%lld\n", 461 (long long)p_base, (long long)file_pos); 462 if (verbose && p_base < file_pos) { 463 fseeko(pfp, p_base, SEEK_SET); 464 say("The text leading up to this was:\n--------------------------\n"); 465 while (ftello(pfp) < file_pos) { 466 len = pgets(false); 467 if (len == 0) 468 fatal("Unexpected end of file\n"); 469 say("|%s", buf); 470 } 471 say("--------------------------\n"); 472 } else 473 fseeko(pfp, file_pos, SEEK_SET); 474 p_input_line = file_line - 1; 475 } 476 477 /* Make this a function for better debugging. */ 478 static void 479 malformed(void) 480 { 481 fatal("malformed patch at line %ld: %s", p_input_line, buf); 482 /* about as informative as "Syntax error" in C */ 483 } 484 485 /* 486 * True if the line has been discarded (i.e. it is a line saying 487 * "\ No newline at end of file".) 488 */ 489 static bool 490 remove_special_line(void) 491 { 492 int c; 493 494 c = fgetc(pfp); 495 if (c == '\\') { 496 do { 497 c = fgetc(pfp); 498 } while (c != EOF && c != '\n'); 499 500 return true; 501 } 502 if (c != EOF) 503 fseeko(pfp, -1, SEEK_CUR); 504 505 return false; 506 } 507 508 /* 509 * True if there is more of the current diff listing to process. 510 */ 511 bool 512 another_hunk(void) 513 { 514 off_t line_beginning; /* file pos of the current line */ 515 LINENUM repl_beginning; /* index of --- line */ 516 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 517 LINENUM fillsrc; /* index of first line to copy */ 518 LINENUM filldst; /* index of first missing line */ 519 bool ptrn_spaces_eaten; /* ptrn was slightly malformed */ 520 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 521 bool repl_missing; /* we are now backtracking */ 522 off_t repl_backtrack_position; /* file pos of first repl line */ 523 LINENUM repl_patch_line; /* input line number for same */ 524 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 525 char *s; 526 size_t len; 527 int context = 0; 528 529 while (p_end >= 0) { 530 if (p_end == p_efake) 531 p_end = p_bfake; /* don't free twice */ 532 else 533 free(p_line[p_end]); 534 p_end--; 535 } 536 p_efake = -1; 537 538 p_max = hunkmax; /* gets reduced when --- found */ 539 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 540 line_beginning = ftello(pfp); 541 repl_beginning = 0; 542 fillcnt = 0; 543 fillsrc = 0; 544 filldst = 0; 545 ptrn_spaces_eaten = false; 546 repl_could_be_missing = true; 547 repl_missing = false; 548 repl_backtrack_position = 0; 549 repl_patch_line = 0; 550 ptrn_copiable = 0; 551 552 len = pgets(true); 553 p_input_line++; 554 if (len == 0 || strnNE(buf, "********", 8)) { 555 next_intuit_at(line_beginning, p_input_line); 556 return false; 557 } 558 p_context = 100; 559 p_hunk_beg = p_input_line + 1; 560 while (p_end < p_max) { 561 line_beginning = ftello(pfp); 562 len = pgets(true); 563 p_input_line++; 564 if (len == 0) { 565 if (p_max - p_end < 4) { 566 /* assume blank lines got chopped */ 567 strlcpy(buf, " \n", buf_size); 568 } else { 569 if (repl_beginning && repl_could_be_missing) { 570 repl_missing = true; 571 goto hunk_done; 572 } 573 fatal("unexpected end of file in patch\n"); 574 } 575 } 576 p_end++; 577 if (p_end >= hunkmax) 578 fatal("Internal error: hunk larger than hunk " 579 "buffer size"); 580 p_char[p_end] = *buf; 581 p_line[p_end] = NULL; 582 switch (*buf) { 583 case '*': 584 if (strnEQ(buf, "********", 8)) { 585 if (repl_beginning && repl_could_be_missing) { 586 repl_missing = true; 587 goto hunk_done; 588 } else 589 fatal("unexpected end of hunk " 590 "at line %ld\n", 591 p_input_line); 592 } 593 if (p_end != 0) { 594 if (repl_beginning && repl_could_be_missing) { 595 repl_missing = true; 596 goto hunk_done; 597 } 598 fatal("unexpected *** at line %ld: %s", 599 p_input_line, buf); 600 } 601 context = 0; 602 p_line[p_end] = savestr(buf); 603 if (out_of_mem) { 604 p_end--; 605 return false; 606 } 607 for (s = buf; 608 *s && !isdigit((unsigned char)*s); s++) 609 ; 610 if (!*s) 611 malformed(); 612 if (strnEQ(s, "0,0", 3)) 613 memmove(s, s + 2, strlen(s + 2) + 1); 614 p_first = strtolinenum(s, &s); 615 if (*s == ',') { 616 for (; 617 *s && !isdigit((unsigned char)*s); s++) 618 ; 619 if (!*s) 620 malformed(); 621 p_ptrn_lines = strtolinenum(s, &s) - p_first + 1; 622 if (p_ptrn_lines < 0) 623 malformed(); 624 } else if (p_first) 625 p_ptrn_lines = 1; 626 else { 627 p_ptrn_lines = 0; 628 p_first = 1; 629 } 630 if (p_first >= LINENUM_MAX - p_ptrn_lines || 631 p_ptrn_lines >= LINENUM_MAX - 6) 632 malformed(); 633 634 /* we need this much at least */ 635 p_max = p_ptrn_lines + 6; 636 while (p_max >= hunkmax) 637 grow_hunkmax(); 638 p_max = hunkmax; 639 break; 640 case '-': 641 if (buf[1] == '-') { 642 if (repl_beginning || 643 (p_end != p_ptrn_lines + 1 + 644 (p_char[p_end - 1] == '\n'))) { 645 if (p_end == 1) { 646 /* 647 * `old' lines were omitted; 648 * set up to fill them in 649 * from 'new' context lines. 650 */ 651 p_end = p_ptrn_lines + 1; 652 fillsrc = p_end + 1; 653 filldst = 1; 654 fillcnt = p_ptrn_lines; 655 } else { 656 if (repl_beginning) { 657 if (repl_could_be_missing) { 658 repl_missing = true; 659 goto hunk_done; 660 } 661 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 662 p_input_line, p_hunk_beg + repl_beginning); 663 } else { 664 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 665 (p_end <= p_ptrn_lines 666 ? "Premature" 667 : "Overdue"), 668 p_input_line, p_hunk_beg); 669 } 670 } 671 } 672 repl_beginning = p_end; 673 repl_backtrack_position = ftello(pfp); 674 repl_patch_line = p_input_line; 675 p_line[p_end] = savestr(buf); 676 if (out_of_mem) { 677 p_end--; 678 return false; 679 } 680 p_char[p_end] = '='; 681 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 682 ; 683 if (!*s) 684 malformed(); 685 p_newfirst = strtolinenum(s, &s); 686 if (*s == ',') { 687 for (; *s && !isdigit((unsigned char)*s); s++) 688 ; 689 if (!*s) 690 malformed(); 691 p_repl_lines = strtolinenum(s, &s) - 692 p_newfirst + 1; 693 if (p_repl_lines < 0) 694 malformed(); 695 } else if (p_newfirst) 696 p_repl_lines = 1; 697 else { 698 p_repl_lines = 0; 699 p_newfirst = 1; 700 } 701 if (p_newfirst >= LINENUM_MAX - p_repl_lines || 702 p_repl_lines >= LINENUM_MAX - p_end) 703 malformed(); 704 p_max = p_repl_lines + p_end; 705 if (p_max > MAXHUNKSIZE) 706 fatal("hunk too large (%ld lines) at line %ld: %s", 707 p_max, p_input_line, buf); 708 while (p_max >= hunkmax) 709 grow_hunkmax(); 710 if (p_repl_lines != ptrn_copiable && 711 (p_context != 0 || p_repl_lines != 1)) 712 repl_could_be_missing = false; 713 break; 714 } 715 goto change_line; 716 case '+': 717 case '!': 718 repl_could_be_missing = false; 719 change_line: 720 if (buf[1] == '\n' && canonicalize) 721 strlcpy(buf + 1, " \n", buf_size - 1); 722 if (!isspace((unsigned char)buf[1]) && 723 buf[1] != '>' && buf[1] != '<' && 724 repl_beginning && repl_could_be_missing) { 725 repl_missing = true; 726 goto hunk_done; 727 } 728 if (context >= 0) { 729 if (context < p_context) 730 p_context = context; 731 context = -1000; 732 } 733 p_line[p_end] = savestr(buf + 2); 734 if (out_of_mem) { 735 p_end--; 736 return false; 737 } 738 if (p_end == p_ptrn_lines) { 739 if (remove_special_line()) { 740 int l; 741 742 l = strlen(p_line[p_end]) - 1; 743 (p_line[p_end])[l] = 0; 744 } 745 } 746 break; 747 case '\t': 748 case '\n': /* assume the 2 spaces got eaten */ 749 if (repl_beginning && repl_could_be_missing && 750 (!ptrn_spaces_eaten || 751 diff_type == NEW_CONTEXT_DIFF)) { 752 repl_missing = true; 753 goto hunk_done; 754 } 755 p_line[p_end] = savestr(buf); 756 if (out_of_mem) { 757 p_end--; 758 return false; 759 } 760 if (p_end != p_ptrn_lines + 1) { 761 ptrn_spaces_eaten |= (repl_beginning != 0); 762 context++; 763 if (!repl_beginning) 764 ptrn_copiable++; 765 p_char[p_end] = ' '; 766 } 767 break; 768 case ' ': 769 if (!isspace((unsigned char)buf[1]) && 770 repl_beginning && repl_could_be_missing) { 771 repl_missing = true; 772 goto hunk_done; 773 } 774 context++; 775 if (!repl_beginning) 776 ptrn_copiable++; 777 p_line[p_end] = savestr(buf + 2); 778 if (out_of_mem) { 779 p_end--; 780 return false; 781 } 782 break; 783 default: 784 if (repl_beginning && repl_could_be_missing) { 785 repl_missing = true; 786 goto hunk_done; 787 } 788 malformed(); 789 } 790 /* set up p_len for strncmp() so we don't have to */ 791 /* assume null termination */ 792 if (p_line[p_end]) 793 p_len[p_end] = strlen(p_line[p_end]); 794 else 795 p_len[p_end] = 0; 796 } 797 798 hunk_done: 799 if (p_end >= 0 && !repl_beginning) 800 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 801 802 if (repl_missing) { 803 804 /* reset state back to just after --- */ 805 p_input_line = repl_patch_line; 806 for (p_end--; p_end > repl_beginning; p_end--) 807 free(p_line[p_end]); 808 fseeko(pfp, repl_backtrack_position, SEEK_SET); 809 810 /* redundant 'new' context lines were omitted - set */ 811 /* up to fill them in from the old file context */ 812 if (!p_context && p_repl_lines == 1) { 813 p_repl_lines = 0; 814 p_max--; 815 } 816 fillsrc = 1; 817 filldst = repl_beginning + 1; 818 fillcnt = p_repl_lines; 819 p_end = p_max; 820 } else if (!p_context && fillcnt == 1) { 821 /* the first hunk was a null hunk with no context */ 822 /* and we were expecting one line -- fix it up. */ 823 while (filldst < p_end) { 824 p_line[filldst] = p_line[filldst + 1]; 825 p_char[filldst] = p_char[filldst + 1]; 826 p_len[filldst] = p_len[filldst + 1]; 827 filldst++; 828 } 829 #if 0 830 repl_beginning--; /* this doesn't need to be fixed */ 831 #endif 832 p_end--; 833 p_first++; /* do append rather than insert */ 834 fillcnt = 0; 835 p_ptrn_lines = 0; 836 } 837 if (diff_type == CONTEXT_DIFF && 838 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 839 if (verbose) 840 say("%s\n%s\n%s\n", 841 "(Fascinating--this is really a new-style context diff but without", 842 "the telltale extra asterisks on the *** line that usually indicate", 843 "the new style...)"); 844 diff_type = NEW_CONTEXT_DIFF; 845 } 846 /* if there were omitted context lines, fill them in now */ 847 if (fillcnt) { 848 p_bfake = filldst; /* remember where not to free() */ 849 p_efake = filldst + fillcnt - 1; 850 while (fillcnt-- > 0) { 851 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 852 fillsrc++; 853 if (fillsrc > p_end) 854 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 855 p_hunk_beg); 856 p_line[filldst] = p_line[fillsrc]; 857 p_char[filldst] = p_char[fillsrc]; 858 p_len[filldst] = p_len[fillsrc]; 859 fillsrc++; 860 filldst++; 861 } 862 while (fillsrc <= p_end && fillsrc != repl_beginning && 863 p_char[fillsrc] != ' ') 864 fillsrc++; 865 #ifdef DEBUGGING 866 if (debug & 64) 867 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 868 fillsrc, filldst, repl_beginning, p_end + 1); 869 #endif 870 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 871 malformed(); 872 if (filldst != p_end + 1 && filldst != repl_beginning) 873 malformed(); 874 } 875 if (p_line[p_end] != NULL) { 876 if (remove_special_line()) { 877 p_len[p_end] -= 1; 878 (p_line[p_end])[p_len[p_end]] = 0; 879 } 880 } 881 } else if (diff_type == UNI_DIFF) { 882 LINENUM fillold; /* index of old lines */ 883 LINENUM fillnew; /* index of new lines */ 884 char ch; 885 886 line_beginning = ftello(pfp); /* file pos of the current line */ 887 len = pgets(true); 888 p_input_line++; 889 if (len == 0 || strnNE(buf, "@@ -", 4)) { 890 next_intuit_at(line_beginning, p_input_line); 891 return false; 892 } 893 s = buf + 4; 894 if (!*s) 895 malformed(); 896 p_first = strtolinenum(s, &s); 897 if (*s == ',') { 898 p_ptrn_lines = strtolinenum(s + 1, &s); 899 } else 900 p_ptrn_lines = 1; 901 if (*s == ' ') 902 s++; 903 if (*s != '+' || !*++s) 904 malformed(); 905 p_newfirst = strtolinenum(s, &s); 906 if (*s == ',') { 907 p_repl_lines = strtolinenum(s + 1, &s); 908 } else 909 p_repl_lines = 1; 910 if (*s == ' ') 911 s++; 912 if (*s != '@') 913 malformed(); 914 if (p_first >= LINENUM_MAX - p_ptrn_lines || 915 p_newfirst > LINENUM_MAX - p_repl_lines || 916 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 917 malformed(); 918 if (!p_ptrn_lines) 919 p_first++; /* do append rather than insert */ 920 p_max = p_ptrn_lines + p_repl_lines + 1; 921 while (p_max >= hunkmax) 922 grow_hunkmax(); 923 fillold = 1; 924 fillnew = fillold + p_ptrn_lines; 925 p_end = fillnew + p_repl_lines; 926 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 927 p_first + p_ptrn_lines - 1); 928 p_line[0] = savestr(buf); 929 if (out_of_mem) { 930 p_end = -1; 931 return false; 932 } 933 p_char[0] = '*'; 934 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 935 p_newfirst + p_repl_lines - 1); 936 p_line[fillnew] = savestr(buf); 937 if (out_of_mem) { 938 p_end = 0; 939 return false; 940 } 941 p_char[fillnew++] = '='; 942 p_context = 100; 943 context = 0; 944 p_hunk_beg = p_input_line + 1; 945 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 946 line_beginning = ftello(pfp); 947 len = pgets(true); 948 p_input_line++; 949 if (len == 0) { 950 if (p_max - fillnew < 3) { 951 /* assume blank lines got chopped */ 952 strlcpy(buf, " \n", buf_size); 953 } else { 954 fatal("unexpected end of file in patch\n"); 955 } 956 } 957 if (*buf == '\t' || *buf == '\n') { 958 ch = ' '; /* assume the space got eaten */ 959 s = savestr(buf); 960 } else { 961 ch = *buf; 962 s = savestr(buf + 1); 963 } 964 if (out_of_mem) { 965 while (--fillnew > p_ptrn_lines) 966 free(p_line[fillnew]); 967 p_end = fillold - 1; 968 return false; 969 } 970 switch (ch) { 971 case '-': 972 if (fillold > p_ptrn_lines) { 973 free(s); 974 p_end = fillnew - 1; 975 malformed(); 976 } 977 p_char[fillold] = ch; 978 p_line[fillold] = s; 979 p_len[fillold++] = strlen(s); 980 if (fillold > p_ptrn_lines) { 981 if (remove_special_line()) { 982 p_len[fillold - 1] -= 1; 983 s[p_len[fillold - 1]] = 0; 984 } 985 } 986 break; 987 case '=': 988 ch = ' '; 989 /* FALL THROUGH */ 990 case ' ': 991 if (fillold > p_ptrn_lines) { 992 free(s); 993 while (--fillnew > p_ptrn_lines) 994 free(p_line[fillnew]); 995 p_end = fillold - 1; 996 malformed(); 997 } 998 context++; 999 p_char[fillold] = ch; 1000 p_line[fillold] = s; 1001 p_len[fillold++] = strlen(s); 1002 s = savestr(s); 1003 if (out_of_mem) { 1004 while (--fillnew > p_ptrn_lines) 1005 free(p_line[fillnew]); 1006 p_end = fillold - 1; 1007 return false; 1008 } 1009 if (fillold > p_ptrn_lines) { 1010 if (remove_special_line()) { 1011 p_len[fillold - 1] -= 1; 1012 s[p_len[fillold - 1]] = 0; 1013 } 1014 } 1015 /* FALL THROUGH */ 1016 case '+': 1017 if (fillnew > p_end) { 1018 free(s); 1019 while (--fillnew > p_ptrn_lines) 1020 free(p_line[fillnew]); 1021 p_end = fillold - 1; 1022 malformed(); 1023 } 1024 p_char[fillnew] = ch; 1025 p_line[fillnew] = s; 1026 p_len[fillnew++] = strlen(s); 1027 if (fillold > p_ptrn_lines) { 1028 if (remove_special_line()) { 1029 p_len[fillnew - 1] -= 1; 1030 s[p_len[fillnew - 1]] = 0; 1031 } 1032 } 1033 break; 1034 default: 1035 p_end = fillnew; 1036 malformed(); 1037 } 1038 if (ch != ' ' && context > 0) { 1039 if (context < p_context) 1040 p_context = context; 1041 context = -1000; 1042 } 1043 } /* while */ 1044 } else { /* normal diff--fake it up */ 1045 char hunk_type; 1046 int i; 1047 LINENUM min, max; 1048 1049 line_beginning = ftello(pfp); 1050 p_context = 0; 1051 len = pgets(true); 1052 p_input_line++; 1053 if (len == 0 || !isdigit((unsigned char)*buf)) { 1054 next_intuit_at(line_beginning, p_input_line); 1055 return false; 1056 } 1057 p_first = strtolinenum(buf, &s); 1058 if (*s == ',') { 1059 p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1; 1060 if (p_ptrn_lines < 0) 1061 malformed(); 1062 } else 1063 p_ptrn_lines = (*s != 'a'); 1064 hunk_type = *s; 1065 if (hunk_type == 'a') 1066 p_first++; /* do append rather than insert */ 1067 min = strtolinenum(s + 1, &s); 1068 if (*s == ',') 1069 max = strtolinenum(s + 1, &s); 1070 else 1071 max = min; 1072 if (min < 0 || min > max || max - min == LINENUM_MAX) 1073 malformed(); 1074 if (hunk_type == 'd') 1075 min++; 1076 p_newfirst = min; 1077 p_repl_lines = max - min + 1; 1078 if (p_newfirst > LINENUM_MAX - p_repl_lines || 1079 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1080 malformed(); 1081 p_end = p_ptrn_lines + p_repl_lines + 1; 1082 if (p_end > MAXHUNKSIZE) 1083 fatal("hunk too large (%ld lines) at line %ld: %s", 1084 p_end, p_input_line, buf); 1085 while (p_end >= hunkmax) 1086 grow_hunkmax(); 1087 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1088 p_first + p_ptrn_lines - 1); 1089 p_line[0] = savestr(buf); 1090 if (out_of_mem) { 1091 p_end = -1; 1092 return false; 1093 } 1094 p_char[0] = '*'; 1095 for (i = 1; i <= p_ptrn_lines; i++) { 1096 len = pgets(true); 1097 p_input_line++; 1098 if (len == 0) 1099 fatal("unexpected end of file in patch at line %ld\n", 1100 p_input_line); 1101 if (*buf != '<') 1102 fatal("< expected at line %ld of patch\n", 1103 p_input_line); 1104 p_line[i] = savestr(buf + 2); 1105 if (out_of_mem) { 1106 p_end = i - 1; 1107 return false; 1108 } 1109 p_len[i] = strlen(p_line[i]); 1110 p_char[i] = '-'; 1111 } 1112 1113 if (remove_special_line()) { 1114 p_len[i - 1] -= 1; 1115 (p_line[i - 1])[p_len[i - 1]] = 0; 1116 } 1117 if (hunk_type == 'c') { 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 } 1127 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1128 p_line[i] = savestr(buf); 1129 if (out_of_mem) { 1130 p_end = i - 1; 1131 return false; 1132 } 1133 p_char[i] = '='; 1134 for (i++; i <= p_end; i++) { 1135 len = pgets(true); 1136 p_input_line++; 1137 if (len == 0) 1138 fatal("unexpected end of file in patch at line %ld\n", 1139 p_input_line); 1140 if (*buf != '>') 1141 fatal("> expected at line %ld of patch\n", 1142 p_input_line); 1143 /* Don't overrun if we don't have enough line */ 1144 if (len > 2) 1145 p_line[i] = savestr(buf + 2); 1146 else 1147 p_line[i] = savestr(""); 1148 1149 if (out_of_mem) { 1150 p_end = i - 1; 1151 return false; 1152 } 1153 p_len[i] = strlen(p_line[i]); 1154 p_char[i] = '+'; 1155 } 1156 1157 if (remove_special_line()) { 1158 p_len[i - 1] -= 1; 1159 (p_line[i - 1])[p_len[i - 1]] = 0; 1160 } 1161 } 1162 if (reverse) /* backwards patch? */ 1163 if (!pch_swap()) 1164 say("Not enough memory to swap next hunk!\n"); 1165 #ifdef DEBUGGING 1166 if (debug & 2) { 1167 LINENUM i; 1168 char special; 1169 1170 for (i = 0; i <= p_end; i++) { 1171 if (i == p_ptrn_lines) 1172 special = '^'; 1173 else 1174 special = ' '; 1175 fprintf(stderr, "%3ld %c %c %s", i, p_char[i], 1176 special, p_line[i]); 1177 fflush(stderr); 1178 } 1179 } 1180 #endif 1181 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1182 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1183 return true; 1184 } 1185 1186 /* 1187 * Input a line from the patch file. 1188 * Worry about indentation if do_indent is true. 1189 * The line is read directly into the buf global variable which 1190 * is resized if necessary in order to hold the complete line. 1191 * Returns the number of characters read including the terminating 1192 * '\n', if any. 1193 */ 1194 size_t 1195 pgets(bool do_indent) 1196 { 1197 char *line; 1198 size_t len; 1199 int indent = 0, skipped = 0; 1200 1201 line = fgetln(pfp, &len); 1202 if (line != NULL) { 1203 if (len + 1 > buf_size) { 1204 while (len + 1 > buf_size) 1205 buf_size *= 2; 1206 free(buf); 1207 buf = malloc(buf_size); 1208 if (buf == NULL) 1209 fatal("out of memory\n"); 1210 } 1211 if (do_indent == 1 && p_indent) { 1212 for (; 1213 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1214 line++, skipped++) { 1215 if (*line == '\t') 1216 indent += 8 - (indent %7); 1217 else 1218 indent++; 1219 } 1220 } 1221 memcpy(buf, line, len - skipped); 1222 buf[len - skipped] = '\0'; 1223 } 1224 return len; 1225 } 1226 1227 1228 /* 1229 * Reverse the old and new portions of the current hunk. 1230 */ 1231 bool 1232 pch_swap(void) 1233 { 1234 char **tp_line; /* the text of the hunk */ 1235 unsigned short *tp_len;/* length of each line */ 1236 char *tp_char; /* +, -, and ! */ 1237 LINENUM i; 1238 LINENUM n; 1239 bool blankline = false; 1240 char *s; 1241 1242 i = p_first; 1243 p_first = p_newfirst; 1244 p_newfirst = i; 1245 1246 /* make a scratch copy */ 1247 1248 tp_line = p_line; 1249 tp_len = p_len; 1250 tp_char = p_char; 1251 p_line = NULL; /* force set_hunkmax to allocate again */ 1252 p_len = NULL; 1253 p_char = NULL; 1254 set_hunkmax(); 1255 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1256 1257 free(p_line); 1258 p_line = tp_line; 1259 free(p_len); 1260 p_len = tp_len; 1261 free(p_char); 1262 p_char = tp_char; 1263 return false; /* not enough memory to swap hunk! */ 1264 } 1265 /* now turn the new into the old */ 1266 1267 i = p_ptrn_lines + 1; 1268 if (tp_char[i] == '\n') { /* account for possible blank line */ 1269 blankline = true; 1270 i++; 1271 } 1272 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1273 if (p_efake <= i) 1274 n = p_end - i + 1; 1275 else 1276 n = -i; 1277 p_efake += n; 1278 p_bfake += n; 1279 } 1280 for (n = 0; i <= p_end; i++, n++) { 1281 p_line[n] = tp_line[i]; 1282 p_char[n] = tp_char[i]; 1283 if (p_char[n] == '+') 1284 p_char[n] = '-'; 1285 p_len[n] = tp_len[i]; 1286 } 1287 if (blankline) { 1288 i = p_ptrn_lines + 1; 1289 p_line[n] = tp_line[i]; 1290 p_char[n] = tp_char[i]; 1291 p_len[n] = tp_len[i]; 1292 n++; 1293 } 1294 if (p_char[0] != '=') 1295 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1296 p_input_line, p_char[0]); 1297 p_char[0] = '*'; 1298 for (s = p_line[0]; *s; s++) 1299 if (*s == '-') 1300 *s = '*'; 1301 1302 /* now turn the old into the new */ 1303 1304 if (p_char[0] != '*') 1305 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1306 p_input_line, p_char[0]); 1307 tp_char[0] = '='; 1308 for (s = tp_line[0]; *s; s++) 1309 if (*s == '*') 1310 *s = '-'; 1311 for (i = 0; n <= p_end; i++, n++) { 1312 p_line[n] = tp_line[i]; 1313 p_char[n] = tp_char[i]; 1314 if (p_char[n] == '-') 1315 p_char[n] = '+'; 1316 p_len[n] = tp_len[i]; 1317 } 1318 1319 if (i != p_ptrn_lines + 1) 1320 fatal("Malformed patch at line %ld: expected %ld lines, " 1321 "got %ld\n", 1322 p_input_line, p_ptrn_lines + 1, i); 1323 1324 i = p_ptrn_lines; 1325 p_ptrn_lines = p_repl_lines; 1326 p_repl_lines = i; 1327 1328 free(tp_line); 1329 free(tp_len); 1330 free(tp_char); 1331 1332 return true; 1333 } 1334 1335 /* 1336 * Return the specified line position in the old file of the old context. 1337 */ 1338 LINENUM 1339 pch_first(void) 1340 { 1341 return p_first; 1342 } 1343 1344 /* 1345 * Return the number of lines of old context. 1346 */ 1347 LINENUM 1348 pch_ptrn_lines(void) 1349 { 1350 return p_ptrn_lines; 1351 } 1352 1353 /* 1354 * Return the probable line position in the new file of the first line. 1355 */ 1356 LINENUM 1357 pch_newfirst(void) 1358 { 1359 return p_newfirst; 1360 } 1361 1362 /* 1363 * Return the number of lines in the replacement text including context. 1364 */ 1365 LINENUM 1366 pch_repl_lines(void) 1367 { 1368 return p_repl_lines; 1369 } 1370 1371 /* 1372 * Return the number of lines in the whole hunk. 1373 */ 1374 LINENUM 1375 pch_end(void) 1376 { 1377 return p_end; 1378 } 1379 1380 /* 1381 * Return the number of context lines before the first changed line. 1382 */ 1383 LINENUM 1384 pch_context(void) 1385 { 1386 return p_context; 1387 } 1388 1389 /* 1390 * Return the length of a particular patch line. 1391 */ 1392 unsigned short 1393 pch_line_len(LINENUM line) 1394 { 1395 return p_len[line]; 1396 } 1397 1398 /* 1399 * Return the control character (+, -, *, !, etc) for a patch line. 1400 */ 1401 char 1402 pch_char(LINENUM line) 1403 { 1404 return p_char[line]; 1405 } 1406 1407 /* 1408 * Return a pointer to a particular patch line. 1409 */ 1410 char * 1411 pfetch(LINENUM line) 1412 { 1413 return p_line[line]; 1414 } 1415 1416 /* 1417 * Return where in the patch file this hunk began, for error messages. 1418 */ 1419 LINENUM 1420 pch_hunk_beg(void) 1421 { 1422 return p_hunk_beg; 1423 } 1424 1425 /* 1426 * Apply an ed script by feeding ed itself. 1427 */ 1428 void 1429 do_ed_script(void) 1430 { 1431 char *t; 1432 off_t beginning_of_this_line; 1433 FILE *pipefp = NULL; 1434 int continuation; 1435 1436 if (!skip_rest_of_patch) { 1437 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1438 unlink(TMPOUTNAME); 1439 fatal("can't create temp file %s", TMPOUTNAME); 1440 } 1441 snprintf(buf, buf_size, "%s%s%s", _PATH_RED, 1442 verbose ? " " : " -s ", TMPOUTNAME); 1443 pipefp = popen(buf, "w"); 1444 } 1445 for (;;) { 1446 beginning_of_this_line = ftello(pfp); 1447 if (pgets(true) == 0) { 1448 next_intuit_at(beginning_of_this_line, p_input_line); 1449 break; 1450 } 1451 p_input_line++; 1452 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1453 ; 1454 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1455 if (isdigit((unsigned char)*buf) && 1456 (*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) { 1457 if (pipefp != NULL) 1458 fputs(buf, pipefp); 1459 if (*t == 's') { 1460 for (;;) { 1461 continuation = 0; 1462 t = strchr(buf, '\0') - 1; 1463 while (--t >= buf && *t == '\\') 1464 continuation = !continuation; 1465 if (!continuation || 1466 pgets(true) == 0) 1467 break; 1468 if (pipefp != NULL) 1469 fputs(buf, pipefp); 1470 } 1471 } else if (*t != 'd') { 1472 while (pgets(true)) { 1473 p_input_line++; 1474 if (pipefp != NULL) 1475 fputs(buf, pipefp); 1476 if (strEQ(buf, ".\n")) 1477 break; 1478 } 1479 } 1480 } else { 1481 next_intuit_at(beginning_of_this_line, p_input_line); 1482 break; 1483 } 1484 } 1485 if (pipefp == NULL) 1486 return; 1487 fprintf(pipefp, "w\n"); 1488 fprintf(pipefp, "q\n"); 1489 fflush(pipefp); 1490 pclose(pipefp); 1491 ignore_signals(); 1492 if (!check_only) { 1493 if (move_file(TMPOUTNAME, outname) < 0) { 1494 toutkeep = true; 1495 chmod(TMPOUTNAME, filemode); 1496 } else 1497 chmod(outname, filemode); 1498 } 1499 set_signals(1); 1500 } 1501 1502 /* 1503 * Choose the name of the file to be patched based on POSIX rules. 1504 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1505 * if the user specified --posix or set POSIXLY_CORRECT. 1506 */ 1507 static char * 1508 posix_name(const struct file_name *names, bool assume_exists) 1509 { 1510 char *path = NULL; 1511 int i; 1512 1513 /* 1514 * POSIX states that the filename will be chosen from one 1515 * of the old, new and index names (in that order) if 1516 * the file exists relative to CWD after -p stripping. 1517 */ 1518 for (i = 0; i < MAX_FILE; i++) { 1519 if (names[i].path != NULL && names[i].exists) { 1520 path = names[i].path; 1521 break; 1522 } 1523 } 1524 if (path == NULL && !assume_exists) { 1525 /* 1526 * No files found, check to see if the diff could be 1527 * creating a new file. 1528 */ 1529 if (path == NULL && ok_to_create_file && 1530 names[NEW_FILE].path != NULL) 1531 path = names[NEW_FILE].path; 1532 } 1533 1534 return path ? xstrdup(path) : NULL; 1535 } 1536 1537 static char * 1538 compare_names(const struct file_name *names, bool assume_exists) 1539 { 1540 size_t min_components, min_baselen, min_len, tmp; 1541 char *best = NULL; 1542 char *path; 1543 int i; 1544 1545 /* 1546 * The "best" name is the one with the fewest number of path 1547 * components, the shortest basename length, and the shortest 1548 * overall length (in that order). We only use the Index: file 1549 * if neither of the old or new files could be intuited from 1550 * the diff header. 1551 */ 1552 min_components = min_baselen = min_len = SIZE_MAX; 1553 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1554 path = names[i].path; 1555 if (path == NULL || (!names[i].exists && !assume_exists)) 1556 continue; 1557 if ((tmp = num_components(path)) > min_components) 1558 continue; 1559 if (tmp < min_components) { 1560 min_components = tmp; 1561 best = path; 1562 } 1563 if ((tmp = strlen(basename(path))) > min_baselen) 1564 continue; 1565 if (tmp < min_baselen) { 1566 min_baselen = tmp; 1567 best = path; 1568 } 1569 if ((tmp = strlen(path)) > min_len) 1570 continue; 1571 min_len = tmp; 1572 best = path; 1573 } 1574 return best; 1575 } 1576 1577 /* 1578 * Choose the name of the file to be patched based the "best" one 1579 * available. 1580 */ 1581 static char * 1582 best_name(const struct file_name *names, bool assume_exists) 1583 { 1584 char *best; 1585 1586 best = compare_names(names, assume_exists); 1587 1588 /* No match? Check to see if the diff could be creating a new file. */ 1589 if (best == NULL && ok_to_create_file) 1590 best = names[NEW_FILE].path; 1591 1592 return best ? xstrdup(best) : NULL; 1593 } 1594 1595 static size_t 1596 num_components(const char *path) 1597 { 1598 size_t n; 1599 const char *cp; 1600 1601 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1602 while (*cp == '/') 1603 cp++; /* skip consecutive slashes */ 1604 } 1605 return n; 1606 } 1607 1608 /* 1609 * Convert number at NPTR into LINENUM and save address of first 1610 * character that is not a digit in ENDPTR. If conversion is not 1611 * possible, call fatal. 1612 */ 1613 static LINENUM 1614 strtolinenum(char *nptr, char **endptr) 1615 { 1616 LINENUM rv; 1617 char c; 1618 char *p; 1619 const char *errstr; 1620 1621 for (p = nptr; isdigit((unsigned char)*p); p++) 1622 ; 1623 1624 if (p == nptr) 1625 malformed(); 1626 1627 c = *p; 1628 *p = '\0'; 1629 1630 rv = strtonum(nptr, 0, LINENUM_MAX, &errstr); 1631 if (errstr != NULL) 1632 fatal("invalid line number at line %ld: `%s' is %s\n", 1633 p_input_line, nptr, errstr); 1634 1635 *p = c; 1636 *endptr = p; 1637 1638 return rv; 1639 } 1640