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 char *source_file; 74 75 static void grow_hunkmax(void); 76 static int intuit_diff_type(void); 77 static void next_intuit_at(off_t, LINENUM); 78 static void skip_to(off_t, LINENUM); 79 static size_t pgets(bool _do_indent); 80 static char *best_name(const struct file_name *, bool); 81 static char *posix_name(const struct file_name *, bool); 82 static size_t num_components(const char *); 83 static LINENUM strtolinenum(char *, char **); 84 85 /* 86 * Prepare to look for the next patch in the patch file. 87 */ 88 void 89 re_patch(void) 90 { 91 p_first = 0; 92 p_newfirst = 0; 93 p_ptrn_lines = 0; 94 p_repl_lines = 0; 95 p_end = (LINENUM) - 1; 96 p_max = 0; 97 p_indent = 0; 98 } 99 100 /* 101 * Open the patch file at the beginning of time. 102 */ 103 void 104 open_patch_file(const char *filename) 105 { 106 struct stat filestat; 107 int nr, nw; 108 109 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 110 pfp = fopen(TMPPATNAME, "w"); 111 if (pfp == NULL) 112 pfatal("can't create %s", TMPPATNAME); 113 while ((nr = fread(buf, 1, buf_size, stdin)) > 0) { 114 nw = fwrite(buf, 1, nr, pfp); 115 if (nr != nw) 116 pfatal("write error to %s", TMPPATNAME); 117 } 118 if (ferror(pfp) || fclose(pfp)) 119 pfatal("can't write %s", TMPPATNAME); 120 filename = TMPPATNAME; 121 } 122 pfp = fopen(filename, "r"); 123 if (pfp == NULL) 124 pfatal("patch file %s not found", filename); 125 if (fstat(fileno(pfp), &filestat)) 126 pfatal("can't stat %s", filename); 127 p_filesize = filestat.st_size; 128 next_intuit_at(0, 1L); /* start at the beginning */ 129 set_hunkmax(); 130 } 131 132 /* 133 * Make sure our dynamically realloced tables are malloced to begin with. 134 */ 135 void 136 set_hunkmax(void) 137 { 138 if (p_line == NULL) 139 p_line = malloc(hunkmax * sizeof(char *)); 140 if (p_len == NULL) 141 p_len = malloc(hunkmax * sizeof(unsigned short)); 142 if (p_char == NULL) 143 p_char = malloc(hunkmax * sizeof(char)); 144 } 145 146 /* 147 * Enlarge the arrays containing the current hunk of patch. 148 */ 149 static void 150 grow_hunkmax(void) 151 { 152 int new_hunkmax = hunkmax * 2; 153 154 if (p_line == NULL || p_len == NULL || p_char == NULL) 155 fatal("Internal memory allocation error\n"); 156 157 p_line = reallocf(p_line, new_hunkmax * sizeof(char *)); 158 p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short)); 159 p_char = reallocf(p_char, new_hunkmax * sizeof(char)); 160 161 if (p_line != NULL && p_len != NULL && p_char != NULL) { 162 hunkmax = new_hunkmax; 163 return; 164 } 165 166 if (!using_plan_a) 167 fatal("out of memory\n"); 168 out_of_mem = true; /* whatever is null will be allocated again */ 169 /* from within plan_a(), of all places */ 170 } 171 172 /* True if the remainder of the patch file contains a diff of some sort. */ 173 174 bool 175 there_is_another_patch(void) 176 { 177 bool exists = false; 178 179 if (p_base != 0 && p_base >= p_filesize) { 180 if (verbose) 181 say("done\n"); 182 return false; 183 } 184 if (p_filesize == 0) 185 return false; 186 nonempty_patchf_seen = true; 187 if (verbose) 188 say("Hmm..."); 189 diff_type = intuit_diff_type(); 190 if (!diff_type) { 191 if (p_base != 0) { 192 if (verbose) 193 say(" Ignoring the trailing garbage.\ndone\n"); 194 } else 195 say(" I can't seem to find a patch in there anywhere.\n"); 196 return false; 197 } 198 if (verbose) 199 say(" %sooks like %s to me...\n", 200 (p_base == 0 ? "L" : "The next patch l"), 201 diff_type == UNI_DIFF ? "a unified diff" : 202 diff_type == CONTEXT_DIFF ? "a context diff" : 203 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 204 diff_type == NORMAL_DIFF ? "a normal diff" : 205 "an ed script"); 206 if (p_indent && verbose) 207 say("(Patch is indented %d space%s.)\n", p_indent, 208 p_indent == 1 ? "" : "s"); 209 skip_to(p_start, p_sline); 210 while (filearg[0] == NULL) { 211 if (force || batch) { 212 say("No file to patch. Skipping...\n"); 213 filearg[0] = xstrdup(bestguess); 214 skip_rest_of_patch = true; 215 return true; 216 } 217 ask("File to patch: "); 218 if (*buf != '\n') { 219 free(bestguess); 220 bestguess = xstrdup(buf); 221 filearg[0] = fetchname(buf, &exists, 0); 222 } 223 /* 224 * fetchname can now return buf = NULL, exists = true, to 225 * indicate to the caller that /dev/null was specified. Retain 226 * previous behavior for now until this can be better evaluted. 227 */ 228 if (filearg[0] == NULL || !exists) { 229 int def_skip = *bestguess == '\0'; 230 ask("No file found--skip this patch? [%c] ", 231 def_skip ? 'y' : 'n'); 232 if (*buf == 'n' || (!def_skip && *buf != 'y')) 233 continue; 234 if (verbose) 235 say("Skipping patch...\n"); 236 free(filearg[0]); 237 filearg[0] = fetchname(bestguess, &exists, 0); 238 skip_rest_of_patch = true; 239 return true; 240 } 241 } 242 return true; 243 } 244 245 static void 246 p4_fetchname(struct file_name *name, char *str) 247 { 248 char *t, *h; 249 250 /* Skip leading whitespace. */ 251 while (isspace((unsigned char)*str)) 252 str++; 253 254 /* Remove the file revision number. */ 255 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 256 if (*t == '#') 257 h = t; 258 if (h != NULL) 259 *h = '\0'; 260 261 name->path = fetchname(str, &name->exists, strippath); 262 } 263 264 /* Determine what kind of diff is in the remaining part of the patch file. */ 265 266 static int 267 intuit_diff_type(void) 268 { 269 off_t this_line = 0, previous_line; 270 off_t first_command_line = -1; 271 LINENUM fcl_line = -1; 272 bool last_line_was_command = false, this_is_a_command = false; 273 bool stars_last_line = false, stars_this_line = false; 274 char *s, *t; 275 int indent, retval; 276 struct file_name names[MAX_FILE]; 277 int piece_of_git = 0; 278 279 memset(names, 0, sizeof(names)); 280 ok_to_create_file = false; 281 fseeko(pfp, p_base, SEEK_SET); 282 p_input_line = p_bline - 1; 283 for (;;) { 284 previous_line = this_line; 285 last_line_was_command = this_is_a_command; 286 stars_last_line = stars_this_line; 287 this_line = ftello(pfp); 288 indent = 0; 289 p_input_line++; 290 if (pgets(false) == 0) { 291 if (first_command_line >= 0) { 292 /* nothing but deletes!? */ 293 p_start = first_command_line; 294 p_sline = fcl_line; 295 retval = ED_DIFF; 296 goto scan_exit; 297 } else { 298 p_start = this_line; 299 p_sline = p_input_line; 300 retval = 0; 301 goto scan_exit; 302 } 303 } 304 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 305 if (*s == '\t') 306 indent += 8 - (indent % 8); 307 else 308 indent++; 309 } 310 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 311 ; 312 this_is_a_command = (isdigit((unsigned char)*s) && 313 (*t == 'd' || *t == 'c' || *t == 'a')); 314 if (first_command_line < 0 && this_is_a_command) { 315 first_command_line = this_line; 316 fcl_line = p_input_line; 317 p_indent = indent; /* assume this for now */ 318 } 319 if (!stars_last_line && strnEQ(s, "*** ", 4)) 320 names[OLD_FILE].path = fetchname(s + 4, 321 &names[OLD_FILE].exists, strippath); 322 else if (strnEQ(s, "--- ", 4)) { 323 size_t off = 4; 324 if (piece_of_git && strippath == 957 && 325 strnEQ(s, "--- a/", 6)) 326 off = 6; 327 names[NEW_FILE].path = fetchname(s + off, 328 &names[NEW_FILE].exists, strippath); 329 } else if (strnEQ(s, "+++ ", 4)) { 330 /* pretend it is the old name */ 331 size_t off = 4; 332 if (piece_of_git && strippath == 957 && 333 strnEQ(s, "+++ b/", 6)) 334 off = 6; 335 names[OLD_FILE].path = fetchname(s + off, 336 &names[OLD_FILE].exists, strippath); 337 } else if (strnEQ(s, "Index:", 6)) 338 names[INDEX_FILE].path = fetchname(s + 6, 339 &names[INDEX_FILE].exists, strippath); 340 else if (strnEQ(s, "Prereq:", 7)) { 341 for (t = s + 7; isspace((unsigned char)*t); t++) 342 ; 343 revision = xstrdup(t); 344 for (t = revision; 345 *t && !isspace((unsigned char)*t); t++) 346 ; 347 *t = '\0'; 348 if (*revision == '\0') { 349 free(revision); 350 revision = NULL; 351 } 352 } else if (strnEQ(s, "diff --git a/", 13)) { 353 /* Git-style diffs. */ 354 piece_of_git = 1; 355 } else if (strnEQ(s, "==== ", 5)) { 356 /* Perforce-style diffs. */ 357 if ((t = strstr(s + 5, " - ")) != NULL) 358 p4_fetchname(&names[NEW_FILE], t + 3); 359 p4_fetchname(&names[OLD_FILE], s + 5); 360 } 361 if ((!diff_type || diff_type == ED_DIFF) && 362 first_command_line >= 0 && 363 strEQ(s, ".\n")) { 364 p_indent = indent; 365 p_start = first_command_line; 366 p_sline = fcl_line; 367 retval = ED_DIFF; 368 goto scan_exit; 369 } 370 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 371 if (strnEQ(s + 4, "0,0", 3)) 372 ok_to_create_file = true; 373 p_indent = indent; 374 p_start = this_line; 375 p_sline = p_input_line; 376 retval = UNI_DIFF; 377 goto scan_exit; 378 } 379 stars_this_line = strnEQ(s, "********", 8); 380 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 381 strnEQ(s, "*** ", 4)) { 382 if (strtolinenum(s + 4, &s) == 0) 383 ok_to_create_file = true; 384 /* 385 * If this is a new context diff the character just 386 * at the end of the line is a '*'. 387 */ 388 while (*s && *s != '\n') 389 s++; 390 p_indent = indent; 391 p_start = previous_line; 392 p_sline = p_input_line - 1; 393 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 394 goto scan_exit; 395 } 396 if ((!diff_type || diff_type == NORMAL_DIFF) && 397 last_line_was_command && 398 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 399 p_start = previous_line; 400 p_sline = p_input_line - 1; 401 p_indent = indent; 402 retval = NORMAL_DIFF; 403 goto scan_exit; 404 } 405 } 406 scan_exit: 407 if (retval == UNI_DIFF) { 408 /* unswap old and new */ 409 struct file_name tmp = names[OLD_FILE]; 410 names[OLD_FILE] = names[NEW_FILE]; 411 names[NEW_FILE] = tmp; 412 } 413 414 /* Invalidated */ 415 free(source_file); 416 source_file = NULL; 417 418 if (retval != 0) { 419 /* 420 * If we've successfully determined a diff type, stored in 421 * retval, path == NULL means _PATH_DEVNULL if exists is set. 422 * Explicitly specify it here to make it easier to detect later 423 * on that we're actually creating a file and not that we've 424 * just goofed something up. 425 */ 426 if (names[OLD_FILE].path != NULL) 427 source_file = xstrdup(names[OLD_FILE].path); 428 else if (names[OLD_FILE].exists) 429 source_file = xstrdup(_PATH_DEVNULL); 430 } 431 if (filearg[0] == NULL) { 432 if (posix) 433 filearg[0] = posix_name(names, ok_to_create_file); 434 else { 435 /* Ignore the Index: name for context diffs, like GNU */ 436 if (names[OLD_FILE].path != NULL || 437 names[NEW_FILE].path != NULL) { 438 free(names[INDEX_FILE].path); 439 names[INDEX_FILE].path = NULL; 440 } 441 filearg[0] = best_name(names, ok_to_create_file); 442 } 443 } 444 445 free(bestguess); 446 bestguess = NULL; 447 if (filearg[0] != NULL) 448 bestguess = xstrdup(filearg[0]); 449 else if (!ok_to_create_file) { 450 /* 451 * We don't want to create a new file but we need a 452 * filename to set bestguess. Avoid setting filearg[0] 453 * so the file is not created automatically. 454 */ 455 if (posix) 456 bestguess = posix_name(names, true); 457 else 458 bestguess = best_name(names, true); 459 } 460 free(names[OLD_FILE].path); 461 free(names[NEW_FILE].path); 462 free(names[INDEX_FILE].path); 463 return retval; 464 } 465 466 /* 467 * Remember where this patch ends so we know where to start up again. 468 */ 469 static void 470 next_intuit_at(off_t file_pos, LINENUM file_line) 471 { 472 p_base = file_pos; 473 p_bline = file_line; 474 } 475 476 /* 477 * Basically a verbose fseeko() to the actual diff listing. 478 */ 479 static void 480 skip_to(off_t file_pos, LINENUM file_line) 481 { 482 size_t len; 483 484 if (p_base > file_pos) 485 fatal("Internal error: seek %lld>%lld\n", 486 (long long)p_base, (long long)file_pos); 487 if (verbose && p_base < file_pos) { 488 fseeko(pfp, p_base, SEEK_SET); 489 say("The text leading up to this was:\n--------------------------\n"); 490 while (ftello(pfp) < file_pos) { 491 len = pgets(false); 492 if (len == 0) 493 fatal("Unexpected end of file\n"); 494 say("|%s", buf); 495 } 496 say("--------------------------\n"); 497 } else 498 fseeko(pfp, file_pos, SEEK_SET); 499 p_input_line = file_line - 1; 500 } 501 502 /* Make this a function for better debugging. */ 503 static void 504 malformed(void) 505 { 506 fatal("malformed patch at line %ld: %s", p_input_line, buf); 507 /* about as informative as "Syntax error" in C */ 508 } 509 510 /* 511 * True if the line has been discarded (i.e. it is a line saying 512 * "\ No newline at end of file".) 513 */ 514 static bool 515 remove_special_line(void) 516 { 517 int c; 518 519 c = fgetc(pfp); 520 if (c == '\\') { 521 do { 522 c = fgetc(pfp); 523 } while (c != EOF && c != '\n'); 524 525 return true; 526 } 527 if (c != EOF) 528 fseeko(pfp, -1, SEEK_CUR); 529 530 return false; 531 } 532 533 /* 534 * True if there is more of the current diff listing to process. 535 */ 536 bool 537 another_hunk(void) 538 { 539 off_t line_beginning; /* file pos of the current line */ 540 LINENUM repl_beginning; /* index of --- line */ 541 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 542 LINENUM fillsrc; /* index of first line to copy */ 543 LINENUM filldst; /* index of first missing line */ 544 bool ptrn_spaces_eaten; /* ptrn was slightly malformed */ 545 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 546 bool repl_missing; /* we are now backtracking */ 547 off_t repl_backtrack_position; /* file pos of first repl line */ 548 LINENUM repl_patch_line; /* input line number for same */ 549 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 550 char *s; 551 size_t len; 552 int context = 0; 553 554 while (p_end >= 0) { 555 if (p_end == p_efake) 556 p_end = p_bfake; /* don't free twice */ 557 else 558 free(p_line[p_end]); 559 p_end--; 560 } 561 p_efake = -1; 562 563 p_max = hunkmax; /* gets reduced when --- found */ 564 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 565 line_beginning = ftello(pfp); 566 repl_beginning = 0; 567 fillcnt = 0; 568 fillsrc = 0; 569 filldst = 0; 570 ptrn_spaces_eaten = false; 571 repl_could_be_missing = true; 572 repl_missing = false; 573 repl_backtrack_position = 0; 574 repl_patch_line = 0; 575 ptrn_copiable = 0; 576 577 len = pgets(true); 578 p_input_line++; 579 if (len == 0 || strnNE(buf, "********", 8)) { 580 next_intuit_at(line_beginning, p_input_line); 581 return false; 582 } 583 p_context = 100; 584 p_hunk_beg = p_input_line + 1; 585 while (p_end < p_max) { 586 line_beginning = ftello(pfp); 587 len = pgets(true); 588 p_input_line++; 589 if (len == 0) { 590 if (p_max - p_end < 4) { 591 /* assume blank lines got chopped */ 592 strlcpy(buf, " \n", buf_size); 593 } else { 594 if (repl_beginning && repl_could_be_missing) { 595 repl_missing = true; 596 goto hunk_done; 597 } 598 fatal("unexpected end of file in patch\n"); 599 } 600 } 601 p_end++; 602 if (p_end >= hunkmax) 603 fatal("Internal error: hunk larger than hunk " 604 "buffer size"); 605 p_char[p_end] = *buf; 606 p_line[p_end] = NULL; 607 switch (*buf) { 608 case '*': 609 if (strnEQ(buf, "********", 8)) { 610 if (repl_beginning && repl_could_be_missing) { 611 repl_missing = true; 612 goto hunk_done; 613 } else 614 fatal("unexpected end of hunk " 615 "at line %ld\n", 616 p_input_line); 617 } 618 if (p_end != 0) { 619 if (repl_beginning && repl_could_be_missing) { 620 repl_missing = true; 621 goto hunk_done; 622 } 623 fatal("unexpected *** at line %ld: %s", 624 p_input_line, buf); 625 } 626 context = 0; 627 p_line[p_end] = savestr(buf); 628 if (out_of_mem) { 629 p_end--; 630 return false; 631 } 632 for (s = buf; 633 *s && !isdigit((unsigned char)*s); s++) 634 ; 635 if (!*s) 636 malformed(); 637 if (strnEQ(s, "0,0", 3)) 638 memmove(s, s + 2, strlen(s + 2) + 1); 639 p_first = strtolinenum(s, &s); 640 if (*s == ',') { 641 for (; 642 *s && !isdigit((unsigned char)*s); s++) 643 ; 644 if (!*s) 645 malformed(); 646 p_ptrn_lines = strtolinenum(s, &s) - p_first + 1; 647 if (p_ptrn_lines < 0) 648 malformed(); 649 } else if (p_first) 650 p_ptrn_lines = 1; 651 else { 652 p_ptrn_lines = 0; 653 p_first = 1; 654 } 655 if (p_first >= LINENUM_MAX - p_ptrn_lines || 656 p_ptrn_lines >= LINENUM_MAX - 6) 657 malformed(); 658 659 /* we need this much at least */ 660 p_max = p_ptrn_lines + 6; 661 while (p_max >= hunkmax) 662 grow_hunkmax(); 663 p_max = hunkmax; 664 break; 665 case '-': 666 if (buf[1] == '-') { 667 if (repl_beginning || 668 (p_end != p_ptrn_lines + 1 + 669 (p_char[p_end - 1] == '\n'))) { 670 if (p_end == 1) { 671 /* 672 * `old' lines were omitted; 673 * set up to fill them in 674 * from 'new' context lines. 675 */ 676 p_end = p_ptrn_lines + 1; 677 fillsrc = p_end + 1; 678 filldst = 1; 679 fillcnt = p_ptrn_lines; 680 } else { 681 if (repl_beginning) { 682 if (repl_could_be_missing) { 683 repl_missing = true; 684 goto hunk_done; 685 } 686 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 687 p_input_line, p_hunk_beg + repl_beginning); 688 } else { 689 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 690 (p_end <= p_ptrn_lines 691 ? "Premature" 692 : "Overdue"), 693 p_input_line, p_hunk_beg); 694 } 695 } 696 } 697 repl_beginning = p_end; 698 repl_backtrack_position = ftello(pfp); 699 repl_patch_line = p_input_line; 700 p_line[p_end] = savestr(buf); 701 if (out_of_mem) { 702 p_end--; 703 return false; 704 } 705 p_char[p_end] = '='; 706 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 707 ; 708 if (!*s) 709 malformed(); 710 p_newfirst = strtolinenum(s, &s); 711 if (*s == ',') { 712 for (; *s && !isdigit((unsigned char)*s); s++) 713 ; 714 if (!*s) 715 malformed(); 716 p_repl_lines = strtolinenum(s, &s) - 717 p_newfirst + 1; 718 if (p_repl_lines < 0) 719 malformed(); 720 } else if (p_newfirst) 721 p_repl_lines = 1; 722 else { 723 p_repl_lines = 0; 724 p_newfirst = 1; 725 } 726 if (p_newfirst >= LINENUM_MAX - p_repl_lines || 727 p_repl_lines >= LINENUM_MAX - p_end) 728 malformed(); 729 p_max = p_repl_lines + p_end; 730 if (p_max > MAXHUNKSIZE) 731 fatal("hunk too large (%ld lines) at line %ld: %s", 732 p_max, p_input_line, buf); 733 while (p_max >= hunkmax) 734 grow_hunkmax(); 735 if (p_repl_lines != ptrn_copiable && 736 (p_context != 0 || p_repl_lines != 1)) 737 repl_could_be_missing = false; 738 break; 739 } 740 goto change_line; 741 case '+': 742 case '!': 743 repl_could_be_missing = false; 744 change_line: 745 if (buf[1] == '\n' && canonicalize) 746 strlcpy(buf + 1, " \n", buf_size - 1); 747 if (!isspace((unsigned char)buf[1]) && 748 buf[1] != '>' && buf[1] != '<' && 749 repl_beginning && repl_could_be_missing) { 750 repl_missing = true; 751 goto hunk_done; 752 } 753 if (context >= 0) { 754 if (context < p_context) 755 p_context = context; 756 context = -1000; 757 } 758 p_line[p_end] = savestr(buf + 2); 759 if (out_of_mem) { 760 p_end--; 761 return false; 762 } 763 if (p_end == p_ptrn_lines) { 764 if (remove_special_line()) { 765 int l; 766 767 l = strlen(p_line[p_end]) - 1; 768 (p_line[p_end])[l] = 0; 769 } 770 } 771 break; 772 case '\t': 773 case '\n': /* assume the 2 spaces got eaten */ 774 if (repl_beginning && repl_could_be_missing && 775 (!ptrn_spaces_eaten || 776 diff_type == NEW_CONTEXT_DIFF)) { 777 repl_missing = true; 778 goto hunk_done; 779 } 780 p_line[p_end] = savestr(buf); 781 if (out_of_mem) { 782 p_end--; 783 return false; 784 } 785 if (p_end != p_ptrn_lines + 1) { 786 ptrn_spaces_eaten |= (repl_beginning != 0); 787 context++; 788 if (!repl_beginning) 789 ptrn_copiable++; 790 p_char[p_end] = ' '; 791 } 792 break; 793 case ' ': 794 if (!isspace((unsigned char)buf[1]) && 795 repl_beginning && repl_could_be_missing) { 796 repl_missing = true; 797 goto hunk_done; 798 } 799 context++; 800 if (!repl_beginning) 801 ptrn_copiable++; 802 p_line[p_end] = savestr(buf + 2); 803 if (out_of_mem) { 804 p_end--; 805 return false; 806 } 807 break; 808 default: 809 if (repl_beginning && repl_could_be_missing) { 810 repl_missing = true; 811 goto hunk_done; 812 } 813 malformed(); 814 } 815 /* set up p_len for strncmp() so we don't have to */ 816 /* assume null termination */ 817 if (p_line[p_end]) 818 p_len[p_end] = strlen(p_line[p_end]); 819 else 820 p_len[p_end] = 0; 821 } 822 823 hunk_done: 824 if (p_end >= 0 && !repl_beginning) 825 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 826 827 if (repl_missing) { 828 829 /* reset state back to just after --- */ 830 p_input_line = repl_patch_line; 831 for (p_end--; p_end > repl_beginning; p_end--) 832 free(p_line[p_end]); 833 fseeko(pfp, repl_backtrack_position, SEEK_SET); 834 835 /* redundant 'new' context lines were omitted - set */ 836 /* up to fill them in from the old file context */ 837 if (!p_context && p_repl_lines == 1) { 838 p_repl_lines = 0; 839 p_max--; 840 } 841 fillsrc = 1; 842 filldst = repl_beginning + 1; 843 fillcnt = p_repl_lines; 844 p_end = p_max; 845 } else if (!p_context && fillcnt == 1) { 846 /* the first hunk was a null hunk with no context */ 847 /* and we were expecting one line -- fix it up. */ 848 while (filldst < p_end) { 849 p_line[filldst] = p_line[filldst + 1]; 850 p_char[filldst] = p_char[filldst + 1]; 851 p_len[filldst] = p_len[filldst + 1]; 852 filldst++; 853 } 854 #if 0 855 repl_beginning--; /* this doesn't need to be fixed */ 856 #endif 857 p_end--; 858 p_first++; /* do append rather than insert */ 859 fillcnt = 0; 860 p_ptrn_lines = 0; 861 } 862 if (diff_type == CONTEXT_DIFF && 863 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 864 if (verbose) 865 say("%s\n%s\n%s\n", 866 "(Fascinating--this is really a new-style context diff but without", 867 "the telltale extra asterisks on the *** line that usually indicate", 868 "the new style...)"); 869 diff_type = NEW_CONTEXT_DIFF; 870 } 871 /* if there were omitted context lines, fill them in now */ 872 if (fillcnt) { 873 p_bfake = filldst; /* remember where not to free() */ 874 p_efake = filldst + fillcnt - 1; 875 while (fillcnt-- > 0) { 876 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 877 fillsrc++; 878 if (fillsrc > p_end) 879 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 880 p_hunk_beg); 881 p_line[filldst] = p_line[fillsrc]; 882 p_char[filldst] = p_char[fillsrc]; 883 p_len[filldst] = p_len[fillsrc]; 884 fillsrc++; 885 filldst++; 886 } 887 while (fillsrc <= p_end && fillsrc != repl_beginning && 888 p_char[fillsrc] != ' ') 889 fillsrc++; 890 #ifdef DEBUGGING 891 if (debug & 64) 892 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 893 fillsrc, filldst, repl_beginning, p_end + 1); 894 #endif 895 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 896 malformed(); 897 if (filldst != p_end + 1 && filldst != repl_beginning) 898 malformed(); 899 } 900 if (p_line[p_end] != NULL) { 901 if (remove_special_line()) { 902 p_len[p_end] -= 1; 903 (p_line[p_end])[p_len[p_end]] = 0; 904 } 905 } 906 } else if (diff_type == UNI_DIFF) { 907 LINENUM fillold; /* index of old lines */ 908 LINENUM fillnew; /* index of new lines */ 909 char ch; 910 911 line_beginning = ftello(pfp); /* file pos of the current line */ 912 len = pgets(true); 913 p_input_line++; 914 if (len == 0 || strnNE(buf, "@@ -", 4)) { 915 next_intuit_at(line_beginning, p_input_line); 916 return false; 917 } 918 s = buf + 4; 919 if (!*s) 920 malformed(); 921 p_first = strtolinenum(s, &s); 922 if (*s == ',') { 923 p_ptrn_lines = strtolinenum(s + 1, &s); 924 } else 925 p_ptrn_lines = 1; 926 if (*s == ' ') 927 s++; 928 if (*s != '+' || !*++s) 929 malformed(); 930 p_newfirst = strtolinenum(s, &s); 931 if (*s == ',') { 932 p_repl_lines = strtolinenum(s + 1, &s); 933 } else 934 p_repl_lines = 1; 935 if (*s == ' ') 936 s++; 937 if (*s != '@') 938 malformed(); 939 if (p_first >= LINENUM_MAX - p_ptrn_lines || 940 p_newfirst > LINENUM_MAX - p_repl_lines || 941 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 942 malformed(); 943 if (!p_ptrn_lines) 944 p_first++; /* do append rather than insert */ 945 p_max = p_ptrn_lines + p_repl_lines + 1; 946 while (p_max >= hunkmax) 947 grow_hunkmax(); 948 fillold = 1; 949 fillnew = fillold + p_ptrn_lines; 950 p_end = fillnew + p_repl_lines; 951 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 952 p_first + p_ptrn_lines - 1); 953 p_line[0] = savestr(buf); 954 if (out_of_mem) { 955 p_end = -1; 956 return false; 957 } 958 p_char[0] = '*'; 959 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 960 p_newfirst + p_repl_lines - 1); 961 p_line[fillnew] = savestr(buf); 962 if (out_of_mem) { 963 p_end = 0; 964 return false; 965 } 966 p_char[fillnew++] = '='; 967 p_context = 100; 968 context = 0; 969 p_hunk_beg = p_input_line + 1; 970 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 971 line_beginning = ftello(pfp); 972 len = pgets(true); 973 p_input_line++; 974 if (len == 0) { 975 if (p_max - fillnew < 3) { 976 /* assume blank lines got chopped */ 977 strlcpy(buf, " \n", buf_size); 978 } else { 979 fatal("unexpected end of file in patch\n"); 980 } 981 } 982 if (*buf == '\t' || *buf == '\n') { 983 ch = ' '; /* assume the space got eaten */ 984 s = savestr(buf); 985 } else { 986 ch = *buf; 987 s = savestr(buf + 1); 988 } 989 if (out_of_mem) { 990 while (--fillnew > p_ptrn_lines) 991 free(p_line[fillnew]); 992 p_end = fillold - 1; 993 return false; 994 } 995 switch (ch) { 996 case '-': 997 if (fillold > p_ptrn_lines) { 998 free(s); 999 p_end = fillnew - 1; 1000 malformed(); 1001 } 1002 p_char[fillold] = ch; 1003 p_line[fillold] = s; 1004 p_len[fillold++] = strlen(s); 1005 if (fillold > p_ptrn_lines) { 1006 if (remove_special_line()) { 1007 p_len[fillold - 1] -= 1; 1008 s[p_len[fillold - 1]] = 0; 1009 } 1010 } 1011 break; 1012 case '=': 1013 ch = ' '; 1014 /* FALL THROUGH */ 1015 case ' ': 1016 if (fillold > p_ptrn_lines) { 1017 free(s); 1018 while (--fillnew > p_ptrn_lines) 1019 free(p_line[fillnew]); 1020 p_end = fillold - 1; 1021 malformed(); 1022 } 1023 context++; 1024 p_char[fillold] = ch; 1025 p_line[fillold] = s; 1026 p_len[fillold++] = strlen(s); 1027 s = savestr(s); 1028 if (out_of_mem) { 1029 while (--fillnew > p_ptrn_lines) 1030 free(p_line[fillnew]); 1031 p_end = fillold - 1; 1032 return false; 1033 } 1034 if (fillold > p_ptrn_lines) { 1035 if (remove_special_line()) { 1036 p_len[fillold - 1] -= 1; 1037 s[p_len[fillold - 1]] = 0; 1038 } 1039 } 1040 /* FALL THROUGH */ 1041 case '+': 1042 if (fillnew > p_end) { 1043 free(s); 1044 while (--fillnew > p_ptrn_lines) 1045 free(p_line[fillnew]); 1046 p_end = fillold - 1; 1047 malformed(); 1048 } 1049 p_char[fillnew] = ch; 1050 p_line[fillnew] = s; 1051 p_len[fillnew++] = strlen(s); 1052 if (fillold > p_ptrn_lines) { 1053 if (remove_special_line()) { 1054 p_len[fillnew - 1] -= 1; 1055 s[p_len[fillnew - 1]] = 0; 1056 } 1057 } 1058 break; 1059 default: 1060 p_end = fillnew; 1061 malformed(); 1062 } 1063 if (ch != ' ' && context > 0) { 1064 if (context < p_context) 1065 p_context = context; 1066 context = -1000; 1067 } 1068 } /* while */ 1069 } else { /* normal diff--fake it up */ 1070 char hunk_type; 1071 int i; 1072 LINENUM min, max; 1073 1074 line_beginning = ftello(pfp); 1075 p_context = 0; 1076 len = pgets(true); 1077 p_input_line++; 1078 if (len == 0 || !isdigit((unsigned char)*buf)) { 1079 next_intuit_at(line_beginning, p_input_line); 1080 return false; 1081 } 1082 p_first = strtolinenum(buf, &s); 1083 if (*s == ',') { 1084 p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1; 1085 if (p_ptrn_lines < 0) 1086 malformed(); 1087 } else 1088 p_ptrn_lines = (*s != 'a'); 1089 hunk_type = *s; 1090 if (hunk_type == 'a') 1091 p_first++; /* do append rather than insert */ 1092 min = strtolinenum(s + 1, &s); 1093 if (*s == ',') 1094 max = strtolinenum(s + 1, &s); 1095 else 1096 max = min; 1097 if (min < 0 || min > max || max - min == LINENUM_MAX) 1098 malformed(); 1099 if (hunk_type == 'd') 1100 min++; 1101 p_newfirst = min; 1102 p_repl_lines = max - min + 1; 1103 if (p_newfirst > LINENUM_MAX - p_repl_lines || 1104 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1105 malformed(); 1106 p_end = p_ptrn_lines + p_repl_lines + 1; 1107 if (p_end > MAXHUNKSIZE) 1108 fatal("hunk too large (%ld lines) at line %ld: %s", 1109 p_end, p_input_line, buf); 1110 while (p_end >= hunkmax) 1111 grow_hunkmax(); 1112 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1113 p_first + p_ptrn_lines - 1); 1114 p_line[0] = savestr(buf); 1115 if (out_of_mem) { 1116 p_end = -1; 1117 return false; 1118 } 1119 p_char[0] = '*'; 1120 for (i = 1; i <= p_ptrn_lines; i++) { 1121 len = pgets(true); 1122 p_input_line++; 1123 if (len == 0) 1124 fatal("unexpected end of file in patch at line %ld\n", 1125 p_input_line); 1126 if (*buf != '<') 1127 fatal("< expected at line %ld of patch\n", 1128 p_input_line); 1129 p_line[i] = savestr(buf + 2); 1130 if (out_of_mem) { 1131 p_end = i - 1; 1132 return false; 1133 } 1134 p_len[i] = strlen(p_line[i]); 1135 p_char[i] = '-'; 1136 } 1137 1138 if (remove_special_line()) { 1139 p_len[i - 1] -= 1; 1140 (p_line[i - 1])[p_len[i - 1]] = 0; 1141 } 1142 if (hunk_type == 'c') { 1143 len = pgets(true); 1144 p_input_line++; 1145 if (len == 0) 1146 fatal("unexpected end of file in patch at line %ld\n", 1147 p_input_line); 1148 if (*buf != '-') 1149 fatal("--- expected at line %ld of patch\n", 1150 p_input_line); 1151 } 1152 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1153 p_line[i] = savestr(buf); 1154 if (out_of_mem) { 1155 p_end = i - 1; 1156 return false; 1157 } 1158 p_char[i] = '='; 1159 for (i++; i <= p_end; i++) { 1160 len = pgets(true); 1161 p_input_line++; 1162 if (len == 0) 1163 fatal("unexpected end of file in patch at line %ld\n", 1164 p_input_line); 1165 if (*buf != '>') 1166 fatal("> expected at line %ld of patch\n", 1167 p_input_line); 1168 /* Don't overrun if we don't have enough line */ 1169 if (len > 2) 1170 p_line[i] = savestr(buf + 2); 1171 else 1172 p_line[i] = savestr(""); 1173 1174 if (out_of_mem) { 1175 p_end = i - 1; 1176 return false; 1177 } 1178 p_len[i] = strlen(p_line[i]); 1179 p_char[i] = '+'; 1180 } 1181 1182 if (remove_special_line()) { 1183 p_len[i - 1] -= 1; 1184 (p_line[i - 1])[p_len[i - 1]] = 0; 1185 } 1186 } 1187 if (reverse) /* backwards patch? */ 1188 if (!pch_swap()) 1189 say("Not enough memory to swap next hunk!\n"); 1190 #ifdef DEBUGGING 1191 if (debug & 2) { 1192 LINENUM i; 1193 char special; 1194 1195 for (i = 0; i <= p_end; i++) { 1196 if (i == p_ptrn_lines) 1197 special = '^'; 1198 else 1199 special = ' '; 1200 fprintf(stderr, "%3ld %c %c %s", i, p_char[i], 1201 special, p_line[i]); 1202 fflush(stderr); 1203 } 1204 } 1205 #endif 1206 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1207 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1208 return true; 1209 } 1210 1211 /* 1212 * Input a line from the patch file. 1213 * Worry about indentation if do_indent is true. 1214 * The line is read directly into the buf global variable which 1215 * is resized if necessary in order to hold the complete line. 1216 * Returns the number of characters read including the terminating 1217 * '\n', if any. 1218 */ 1219 size_t 1220 pgets(bool do_indent) 1221 { 1222 char *line; 1223 size_t len; 1224 int indent = 0, skipped = 0; 1225 1226 line = fgetln(pfp, &len); 1227 if (line != NULL) { 1228 if (len + 1 > buf_size) { 1229 while (len + 1 > buf_size) 1230 buf_size *= 2; 1231 free(buf); 1232 buf = malloc(buf_size); 1233 if (buf == NULL) 1234 fatal("out of memory\n"); 1235 } 1236 if (do_indent == 1 && p_indent) { 1237 for (; 1238 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1239 line++, skipped++) { 1240 if (*line == '\t') 1241 indent += 8 - (indent %7); 1242 else 1243 indent++; 1244 } 1245 } 1246 memcpy(buf, line, len - skipped); 1247 buf[len - skipped] = '\0'; 1248 } 1249 return len; 1250 } 1251 1252 1253 /* 1254 * Reverse the old and new portions of the current hunk. 1255 */ 1256 bool 1257 pch_swap(void) 1258 { 1259 char **tp_line; /* the text of the hunk */ 1260 unsigned short *tp_len;/* length of each line */ 1261 char *tp_char; /* +, -, and ! */ 1262 LINENUM i; 1263 LINENUM n; 1264 bool blankline = false; 1265 char *s; 1266 1267 i = p_first; 1268 p_first = p_newfirst; 1269 p_newfirst = i; 1270 1271 /* make a scratch copy */ 1272 1273 tp_line = p_line; 1274 tp_len = p_len; 1275 tp_char = p_char; 1276 p_line = NULL; /* force set_hunkmax to allocate again */ 1277 p_len = NULL; 1278 p_char = NULL; 1279 set_hunkmax(); 1280 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1281 1282 free(p_line); 1283 p_line = tp_line; 1284 free(p_len); 1285 p_len = tp_len; 1286 free(p_char); 1287 p_char = tp_char; 1288 return false; /* not enough memory to swap hunk! */ 1289 } 1290 /* now turn the new into the old */ 1291 1292 i = p_ptrn_lines + 1; 1293 if (tp_char[i] == '\n') { /* account for possible blank line */ 1294 blankline = true; 1295 i++; 1296 } 1297 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1298 if (p_efake <= i) 1299 n = p_end - i + 1; 1300 else 1301 n = -i; 1302 p_efake += n; 1303 p_bfake += n; 1304 } 1305 for (n = 0; i <= p_end; i++, n++) { 1306 p_line[n] = tp_line[i]; 1307 p_char[n] = tp_char[i]; 1308 if (p_char[n] == '+') 1309 p_char[n] = '-'; 1310 p_len[n] = tp_len[i]; 1311 } 1312 if (blankline) { 1313 i = p_ptrn_lines + 1; 1314 p_line[n] = tp_line[i]; 1315 p_char[n] = tp_char[i]; 1316 p_len[n] = tp_len[i]; 1317 n++; 1318 } 1319 if (p_char[0] != '=') 1320 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1321 p_input_line, p_char[0]); 1322 p_char[0] = '*'; 1323 for (s = p_line[0]; *s; s++) 1324 if (*s == '-') 1325 *s = '*'; 1326 1327 /* now turn the old into the new */ 1328 1329 if (p_char[0] != '*') 1330 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1331 p_input_line, p_char[0]); 1332 tp_char[0] = '='; 1333 for (s = tp_line[0]; *s; s++) 1334 if (*s == '*') 1335 *s = '-'; 1336 for (i = 0; n <= p_end; i++, n++) { 1337 p_line[n] = tp_line[i]; 1338 p_char[n] = tp_char[i]; 1339 if (p_char[n] == '-') 1340 p_char[n] = '+'; 1341 p_len[n] = tp_len[i]; 1342 } 1343 1344 if (i != p_ptrn_lines + 1) 1345 fatal("Malformed patch at line %ld: expected %ld lines, " 1346 "got %ld\n", 1347 p_input_line, p_ptrn_lines + 1, i); 1348 1349 i = p_ptrn_lines; 1350 p_ptrn_lines = p_repl_lines; 1351 p_repl_lines = i; 1352 1353 free(tp_line); 1354 free(tp_len); 1355 free(tp_char); 1356 1357 return true; 1358 } 1359 1360 /* 1361 * Return the specified line position in the old file of the old context. 1362 */ 1363 LINENUM 1364 pch_first(void) 1365 { 1366 return p_first; 1367 } 1368 1369 /* 1370 * Return the number of lines of old context. 1371 */ 1372 LINENUM 1373 pch_ptrn_lines(void) 1374 { 1375 return p_ptrn_lines; 1376 } 1377 1378 /* 1379 * Return the probable line position in the new file of the first line. 1380 */ 1381 LINENUM 1382 pch_newfirst(void) 1383 { 1384 return p_newfirst; 1385 } 1386 1387 /* 1388 * Return the number of lines in the replacement text including context. 1389 */ 1390 LINENUM 1391 pch_repl_lines(void) 1392 { 1393 return p_repl_lines; 1394 } 1395 1396 /* 1397 * Return the number of lines in the whole hunk. 1398 */ 1399 LINENUM 1400 pch_end(void) 1401 { 1402 return p_end; 1403 } 1404 1405 /* 1406 * Return the number of context lines before the first changed line. 1407 */ 1408 LINENUM 1409 pch_context(void) 1410 { 1411 return p_context; 1412 } 1413 1414 /* 1415 * Return the length of a particular patch line. 1416 */ 1417 unsigned short 1418 pch_line_len(LINENUM line) 1419 { 1420 return p_len[line]; 1421 } 1422 1423 /* 1424 * Return the control character (+, -, *, !, etc) for a patch line. 1425 */ 1426 char 1427 pch_char(LINENUM line) 1428 { 1429 return p_char[line]; 1430 } 1431 1432 /* 1433 * Return a pointer to a particular patch line. 1434 */ 1435 char * 1436 pfetch(LINENUM line) 1437 { 1438 return p_line[line]; 1439 } 1440 1441 /* 1442 * Return where in the patch file this hunk began, for error messages. 1443 */ 1444 LINENUM 1445 pch_hunk_beg(void) 1446 { 1447 return p_hunk_beg; 1448 } 1449 1450 /* 1451 * Apply an ed script by feeding ed itself. 1452 */ 1453 void 1454 do_ed_script(void) 1455 { 1456 char *t; 1457 off_t beginning_of_this_line; 1458 FILE *pipefp = NULL; 1459 int continuation; 1460 1461 if (!skip_rest_of_patch) { 1462 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1463 unlink(TMPOUTNAME); 1464 fatal("can't create temp file %s", TMPOUTNAME); 1465 } 1466 snprintf(buf, buf_size, "%s%s%s", _PATH_RED, 1467 verbose ? " " : " -s ", TMPOUTNAME); 1468 pipefp = popen(buf, "w"); 1469 } 1470 for (;;) { 1471 beginning_of_this_line = ftello(pfp); 1472 if (pgets(true) == 0) { 1473 next_intuit_at(beginning_of_this_line, p_input_line); 1474 break; 1475 } 1476 p_input_line++; 1477 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1478 ; 1479 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1480 if (isdigit((unsigned char)*buf) && 1481 (*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) { 1482 if (pipefp != NULL) 1483 fputs(buf, pipefp); 1484 if (*t == 's') { 1485 for (;;) { 1486 continuation = 0; 1487 t = strchr(buf, '\0') - 1; 1488 while (--t >= buf && *t == '\\') 1489 continuation = !continuation; 1490 if (!continuation || 1491 pgets(true) == 0) 1492 break; 1493 if (pipefp != NULL) 1494 fputs(buf, pipefp); 1495 } 1496 } else if (*t != 'd') { 1497 while (pgets(true)) { 1498 p_input_line++; 1499 if (pipefp != NULL) 1500 fputs(buf, pipefp); 1501 if (strEQ(buf, ".\n")) 1502 break; 1503 } 1504 } 1505 } else { 1506 next_intuit_at(beginning_of_this_line, p_input_line); 1507 break; 1508 } 1509 } 1510 if (pipefp == NULL) 1511 return; 1512 fprintf(pipefp, "w\n"); 1513 fprintf(pipefp, "q\n"); 1514 fflush(pipefp); 1515 pclose(pipefp); 1516 ignore_signals(); 1517 if (!check_only) { 1518 if (move_file(TMPOUTNAME, outname) < 0) { 1519 toutkeep = true; 1520 chmod(TMPOUTNAME, filemode); 1521 } else 1522 chmod(outname, filemode); 1523 } 1524 set_signals(1); 1525 } 1526 1527 /* 1528 * Choose the name of the file to be patched based on POSIX rules. 1529 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1530 * if the user specified --posix or set POSIXLY_CORRECT. 1531 */ 1532 static char * 1533 posix_name(const struct file_name *names, bool assume_exists) 1534 { 1535 char *path = NULL; 1536 int i; 1537 1538 /* 1539 * POSIX states that the filename will be chosen from one 1540 * of the old, new and index names (in that order) if 1541 * the file exists relative to CWD after -p stripping. 1542 */ 1543 for (i = 0; i < MAX_FILE; i++) { 1544 if (names[i].path != NULL && names[i].exists) { 1545 path = names[i].path; 1546 break; 1547 } 1548 } 1549 if (path == NULL && !assume_exists) { 1550 /* 1551 * No files found, check to see if the diff could be 1552 * creating a new file. 1553 */ 1554 if (path == NULL && ok_to_create_file && 1555 names[NEW_FILE].path != NULL) 1556 path = names[NEW_FILE].path; 1557 } 1558 1559 return path ? xstrdup(path) : NULL; 1560 } 1561 1562 static char * 1563 compare_names(const struct file_name *names, bool assume_exists) 1564 { 1565 size_t min_components, min_baselen, min_len, tmp; 1566 char *best = NULL; 1567 char *path; 1568 int i; 1569 1570 /* 1571 * The "best" name is the one with the fewest number of path 1572 * components, the shortest basename length, and the shortest 1573 * overall length (in that order). We only use the Index: file 1574 * if neither of the old or new files could be intuited from 1575 * the diff header. 1576 */ 1577 min_components = min_baselen = min_len = SIZE_MAX; 1578 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1579 path = names[i].path; 1580 if (path == NULL || (!names[i].exists && !assume_exists)) 1581 continue; 1582 if ((tmp = num_components(path)) > min_components) 1583 continue; 1584 if (tmp < min_components) { 1585 min_components = tmp; 1586 best = path; 1587 } 1588 if ((tmp = strlen(basename(path))) > min_baselen) 1589 continue; 1590 if (tmp < min_baselen) { 1591 min_baselen = tmp; 1592 best = path; 1593 } 1594 if ((tmp = strlen(path)) > min_len) 1595 continue; 1596 min_len = tmp; 1597 best = path; 1598 } 1599 return best; 1600 } 1601 1602 /* 1603 * Choose the name of the file to be patched based the "best" one 1604 * available. 1605 */ 1606 static char * 1607 best_name(const struct file_name *names, bool assume_exists) 1608 { 1609 char *best; 1610 1611 best = compare_names(names, assume_exists); 1612 1613 /* No match? Check to see if the diff could be creating a new file. */ 1614 if (best == NULL && ok_to_create_file) 1615 best = names[NEW_FILE].path; 1616 1617 return best ? xstrdup(best) : NULL; 1618 } 1619 1620 static size_t 1621 num_components(const char *path) 1622 { 1623 size_t n; 1624 const char *cp; 1625 1626 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1627 while (*cp == '/') 1628 cp++; /* skip consecutive slashes */ 1629 } 1630 return n; 1631 } 1632 1633 /* 1634 * Convert number at NPTR into LINENUM and save address of first 1635 * character that is not a digit in ENDPTR. If conversion is not 1636 * possible, call fatal. 1637 */ 1638 static LINENUM 1639 strtolinenum(char *nptr, char **endptr) 1640 { 1641 LINENUM rv; 1642 char c; 1643 char *p; 1644 const char *errstr; 1645 1646 for (p = nptr; isdigit((unsigned char)*p); p++) 1647 ; 1648 1649 if (p == nptr) 1650 malformed(); 1651 1652 c = *p; 1653 *p = '\0'; 1654 1655 rv = strtonum(nptr, 0, LINENUM_MAX, &errstr); 1656 if (errstr != NULL) 1657 fatal("invalid line number at line %ld: `%s' is %s\n", 1658 p_input_line, nptr, errstr); 1659 1660 *p = c; 1661 *endptr = p; 1662 1663 return rv; 1664 } 1665