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 */ 28 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 32 #include <ctype.h> 33 #include <libgen.h> 34 #include <limits.h> 35 #include <stdint.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 #include "common.h" 42 #include "util.h" 43 #include "pch.h" 44 #include "pathnames.h" 45 46 /* Patch (diff listing) abstract type. */ 47 48 static off_t p_filesize; /* size of the patch file */ 49 static LINENUM p_first; /* 1st line number */ 50 static LINENUM p_newfirst; /* 1st line number of replacement */ 51 static LINENUM p_ptrn_lines; /* # lines in pattern */ 52 static LINENUM p_repl_lines; /* # lines in replacement text */ 53 static LINENUM p_end = -1; /* last line in hunk */ 54 static LINENUM p_max; /* max allowed value of p_end */ 55 static LINENUM p_context = 3; /* # of context lines */ 56 static LINENUM p_input_line = 0; /* current line # from patch file */ 57 static char **p_line = NULL;/* the text of the hunk */ 58 static size_t *p_len = NULL; /* length of each line */ 59 static char *p_char = NULL; /* +, -, and ! */ 60 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 61 static int p_indent; /* indent to patch */ 62 static off_t p_base; /* where to intuit this time */ 63 static LINENUM p_bline; /* line # of p_base */ 64 static off_t p_start; /* where intuit found a patch */ 65 static LINENUM p_sline; /* and the line number for it */ 66 static LINENUM p_hunk_beg; /* line number of current hunk */ 67 static LINENUM p_efake = -1; /* end of faked up lines--don't free */ 68 static LINENUM p_bfake = -1; /* beg of faked up lines */ 69 static FILE *pfp = NULL; /* patch file pointer */ 70 static char *bestguess = NULL; /* guess at correct filename */ 71 72 char *source_file; 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(size_t)); 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(size_t)); 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 (p_filesize == 0) 184 return false; 185 nonempty_patchf_seen = true; 186 if (verbose) 187 say("Hmm..."); 188 diff_type = intuit_diff_type(); 189 if (!diff_type) { 190 if (p_base != 0) { 191 if (verbose) 192 say(" Ignoring the trailing garbage.\ndone\n"); 193 } else 194 say(" I can't seem to find a patch in there anywhere.\n"); 195 return false; 196 } 197 if (verbose) 198 say(" %sooks like %s to me...\n", 199 (p_base == 0 ? "L" : "The next patch l"), 200 diff_type == UNI_DIFF ? "a unified diff" : 201 diff_type == CONTEXT_DIFF ? "a context diff" : 202 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 203 diff_type == NORMAL_DIFF ? "a normal diff" : 204 "an ed script"); 205 if (p_indent && verbose) 206 say("(Patch is indented %d space%s.)\n", p_indent, 207 p_indent == 1 ? "" : "s"); 208 skip_to(p_start, p_sline); 209 while (filearg[0] == NULL) { 210 if (force || batch) { 211 say("No file to patch. Skipping...\n"); 212 filearg[0] = xstrdup(bestguess); 213 skip_rest_of_patch = true; 214 return true; 215 } 216 ask("File to patch: "); 217 if (*buf != '\n') { 218 free(bestguess); 219 bestguess = xstrdup(buf); 220 filearg[0] = fetchname(buf, &exists, 0); 221 } 222 /* 223 * fetchname can now return buf = NULL, exists = true, to 224 * indicate to the caller that /dev/null was specified. Retain 225 * previous behavior for now until this can be better evaluted. 226 */ 227 if (filearg[0] == NULL || !exists) { 228 int def_skip = *bestguess == '\0'; 229 ask("No file found--skip this patch? [%c] ", 230 def_skip ? 'y' : 'n'); 231 if (*buf == 'n' || (!def_skip && *buf != 'y')) 232 continue; 233 if (verbose) 234 say("Skipping patch...\n"); 235 free(filearg[0]); 236 filearg[0] = fetchname(bestguess, &exists, 0); 237 skip_rest_of_patch = true; 238 return true; 239 } 240 } 241 return true; 242 } 243 244 static void 245 p4_fetchname(struct file_name *name, char *str) 246 { 247 char *t, *h; 248 249 /* Skip leading whitespace. */ 250 while (isspace((unsigned char)*str)) 251 str++; 252 253 /* Remove the file revision number. */ 254 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 255 if (*t == '#') 256 h = t; 257 if (h != NULL) 258 *h = '\0'; 259 260 name->path = fetchname(str, &name->exists, strippath); 261 } 262 263 /* Determine what kind of diff is in the remaining part of the patch file. */ 264 265 static int 266 intuit_diff_type(void) 267 { 268 off_t this_line = 0, previous_line; 269 off_t first_command_line = -1; 270 LINENUM fcl_line = -1; 271 bool last_line_was_command = false, this_is_a_command = false; 272 bool stars_last_line = false, stars_this_line = false; 273 char *s, *t; 274 int indent, retval; 275 struct file_name names[MAX_FILE]; 276 int piece_of_git = 0; 277 278 memset(names, 0, sizeof(names)); 279 ok_to_create_file = false; 280 fseeko(pfp, p_base, SEEK_SET); 281 p_input_line = p_bline - 1; 282 for (;;) { 283 previous_line = this_line; 284 last_line_was_command = this_is_a_command; 285 stars_last_line = stars_this_line; 286 this_line = ftello(pfp); 287 indent = 0; 288 p_input_line++; 289 if (pgets(false) == 0) { 290 if (first_command_line >= 0) { 291 /* nothing but deletes!? */ 292 p_start = first_command_line; 293 p_sline = fcl_line; 294 retval = ED_DIFF; 295 goto scan_exit; 296 } else { 297 p_start = this_line; 298 p_sline = p_input_line; 299 retval = 0; 300 goto scan_exit; 301 } 302 } 303 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 304 if (*s == '\t') 305 indent += 8 - (indent % 8); 306 else 307 indent++; 308 } 309 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 310 ; 311 this_is_a_command = (isdigit((unsigned char)*s) && 312 (*t == 'd' || *t == 'c' || *t == 'a')); 313 if (first_command_line < 0 && this_is_a_command) { 314 first_command_line = this_line; 315 fcl_line = p_input_line; 316 p_indent = indent; /* assume this for now */ 317 } 318 if (!stars_last_line && strnEQ(s, "*** ", 4)) 319 names[OLD_FILE].path = fetchname(s + 4, 320 &names[OLD_FILE].exists, strippath); 321 else if (strnEQ(s, "--- ", 4)) { 322 size_t off = 4; 323 if (piece_of_git && strippath == 957 && 324 strnEQ(s, "--- a/", 6)) 325 off = 6; 326 names[NEW_FILE].path = fetchname(s + off, 327 &names[NEW_FILE].exists, strippath); 328 } else if (strnEQ(s, "+++ ", 4)) { 329 /* pretend it is the old name */ 330 size_t off = 4; 331 if (piece_of_git && strippath == 957 && 332 strnEQ(s, "+++ b/", 6)) 333 off = 6; 334 names[OLD_FILE].path = fetchname(s + off, 335 &names[OLD_FILE].exists, strippath); 336 } else if (strnEQ(s, "Index:", 6)) 337 names[INDEX_FILE].path = fetchname(s + 6, 338 &names[INDEX_FILE].exists, strippath); 339 else if (strnEQ(s, "Prereq:", 7)) { 340 for (t = s + 7; isspace((unsigned char)*t); t++) 341 ; 342 revision = xstrdup(t); 343 for (t = revision; 344 *t && !isspace((unsigned char)*t); t++) 345 ; 346 *t = '\0'; 347 if (*revision == '\0') { 348 free(revision); 349 revision = NULL; 350 } 351 } else if (strnEQ(s, "diff --git a/", 13)) { 352 /* Git-style diffs. */ 353 piece_of_git = 1; 354 } else if (strnEQ(s, "==== ", 5)) { 355 /* Perforce-style diffs. */ 356 if ((t = strstr(s + 5, " - ")) != NULL) 357 p4_fetchname(&names[NEW_FILE], t + 3); 358 p4_fetchname(&names[OLD_FILE], s + 5); 359 } 360 if ((!diff_type || diff_type == ED_DIFF) && 361 first_command_line >= 0 && 362 strEQ(s, ".\n")) { 363 p_indent = indent; 364 p_start = first_command_line; 365 p_sline = fcl_line; 366 retval = ED_DIFF; 367 goto scan_exit; 368 } 369 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 370 if (strnEQ(s + 4, "0,0", 3)) 371 ok_to_create_file = true; 372 p_indent = indent; 373 p_start = this_line; 374 p_sline = p_input_line; 375 retval = UNI_DIFF; 376 goto scan_exit; 377 } 378 stars_this_line = strnEQ(s, "********", 8); 379 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 380 strnEQ(s, "*** ", 4)) { 381 if (strtolinenum(s + 4, &s) == 0) 382 ok_to_create_file = true; 383 /* 384 * If this is a new context diff the character just 385 * at the end of the line is a '*'. 386 */ 387 while (*s && *s != '\n') 388 s++; 389 p_indent = indent; 390 p_start = previous_line; 391 p_sline = p_input_line - 1; 392 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 393 goto scan_exit; 394 } 395 if ((!diff_type || diff_type == NORMAL_DIFF) && 396 last_line_was_command && 397 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 398 p_start = previous_line; 399 p_sline = p_input_line - 1; 400 p_indent = indent; 401 retval = NORMAL_DIFF; 402 goto scan_exit; 403 } 404 } 405 scan_exit: 406 if (retval == UNI_DIFF) { 407 /* unswap old and new */ 408 struct file_name tmp = names[OLD_FILE]; 409 names[OLD_FILE] = names[NEW_FILE]; 410 names[NEW_FILE] = tmp; 411 } 412 413 /* Invalidated */ 414 free(source_file); 415 source_file = NULL; 416 417 if (retval != 0) { 418 /* 419 * If we've successfully determined a diff type, stored in 420 * retval, path == NULL means _PATH_DEVNULL if exists is set. 421 * Explicitly specify it here to make it easier to detect later 422 * on that we're actually creating a file and not that we've 423 * just goofed something up. 424 */ 425 if (names[OLD_FILE].path != NULL) 426 source_file = xstrdup(names[OLD_FILE].path); 427 else if (names[OLD_FILE].exists) 428 source_file = xstrdup(_PATH_DEVNULL); 429 } 430 if (filearg[0] == NULL) { 431 if (posix) 432 filearg[0] = posix_name(names, ok_to_create_file); 433 else { 434 /* Ignore the Index: name for context diffs, like GNU */ 435 if (names[OLD_FILE].path != NULL || 436 names[NEW_FILE].path != NULL) { 437 free(names[INDEX_FILE].path); 438 names[INDEX_FILE].path = NULL; 439 } 440 filearg[0] = best_name(names, ok_to_create_file); 441 } 442 } 443 444 free(bestguess); 445 bestguess = NULL; 446 if (filearg[0] != NULL) 447 bestguess = xstrdup(filearg[0]); 448 else if (!ok_to_create_file) { 449 /* 450 * We don't want to create a new file but we need a 451 * filename to set bestguess. Avoid setting filearg[0] 452 * so the file is not created automatically. 453 */ 454 if (posix) 455 bestguess = posix_name(names, true); 456 else 457 bestguess = best_name(names, true); 458 } 459 free(names[OLD_FILE].path); 460 free(names[NEW_FILE].path); 461 free(names[INDEX_FILE].path); 462 return retval; 463 } 464 465 /* 466 * Remember where this patch ends so we know where to start up again. 467 */ 468 static void 469 next_intuit_at(off_t file_pos, LINENUM file_line) 470 { 471 p_base = file_pos; 472 p_bline = file_line; 473 } 474 475 /* 476 * Basically a verbose fseeko() to the actual diff listing. 477 */ 478 static void 479 skip_to(off_t file_pos, LINENUM file_line) 480 { 481 size_t len; 482 483 if (p_base > file_pos) 484 fatal("Internal error: seek %lld>%lld\n", 485 (long long)p_base, (long long)file_pos); 486 if (verbose && p_base < file_pos) { 487 fseeko(pfp, p_base, SEEK_SET); 488 say("The text leading up to this was:\n--------------------------\n"); 489 while (ftello(pfp) < file_pos) { 490 len = pgets(false); 491 if (len == 0) 492 fatal("Unexpected end of file\n"); 493 say("|%s", buf); 494 } 495 say("--------------------------\n"); 496 } else 497 fseeko(pfp, file_pos, SEEK_SET); 498 p_input_line = file_line - 1; 499 } 500 501 /* Make this a function for better debugging. */ 502 static void 503 malformed(void) 504 { 505 fatal("malformed patch at line %ld: %s", p_input_line, buf); 506 /* about as informative as "Syntax error" in C */ 507 } 508 509 /* 510 * True if the line has been discarded (i.e. it is a line saying 511 * "\ No newline at end of file".) 512 */ 513 static bool 514 remove_special_line(void) 515 { 516 int c; 517 518 c = fgetc(pfp); 519 if (c == '\\') { 520 do { 521 c = fgetc(pfp); 522 } while (c != EOF && c != '\n'); 523 524 return true; 525 } 526 if (c != EOF) 527 fseeko(pfp, -1, SEEK_CUR); 528 529 return false; 530 } 531 532 /* 533 * True if there is more of the current diff listing to process. 534 */ 535 bool 536 another_hunk(void) 537 { 538 off_t line_beginning; /* file pos of the current line */ 539 LINENUM repl_beginning; /* index of --- line */ 540 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 541 LINENUM fillsrc; /* index of first line to copy */ 542 LINENUM filldst; /* index of first missing line */ 543 bool ptrn_spaces_eaten; /* ptrn was slightly malformed */ 544 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 545 bool repl_missing; /* we are now backtracking */ 546 off_t repl_backtrack_position; /* file pos of first repl line */ 547 LINENUM repl_patch_line; /* input line number for same */ 548 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 549 char *s; 550 size_t len; 551 int context = 0; 552 553 while (p_end >= 0) { 554 if (p_end == p_efake) 555 p_end = p_bfake; /* don't free twice */ 556 else 557 free(p_line[p_end]); 558 p_end--; 559 } 560 p_efake = -1; 561 562 p_max = hunkmax; /* gets reduced when --- found */ 563 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 564 line_beginning = ftello(pfp); 565 repl_beginning = 0; 566 fillcnt = 0; 567 fillsrc = 0; 568 filldst = 0; 569 ptrn_spaces_eaten = false; 570 repl_could_be_missing = true; 571 repl_missing = false; 572 repl_backtrack_position = 0; 573 repl_patch_line = 0; 574 ptrn_copiable = 0; 575 576 len = pgets(true); 577 p_input_line++; 578 if (len == 0 || strnNE(buf, "********", 8)) { 579 next_intuit_at(line_beginning, p_input_line); 580 return false; 581 } 582 p_context = 100; 583 p_hunk_beg = p_input_line + 1; 584 while (p_end < p_max) { 585 line_beginning = ftello(pfp); 586 len = pgets(true); 587 p_input_line++; 588 if (len == 0) { 589 if (repl_beginning && repl_could_be_missing) { 590 repl_missing = true; 591 goto hunk_done; 592 } 593 fatal("unexpected end of file in patch\n"); 594 } 595 p_end++; 596 if (p_end >= hunkmax) 597 fatal("Internal error: hunk larger than hunk " 598 "buffer size"); 599 p_char[p_end] = *buf; 600 p_line[p_end] = NULL; 601 switch (*buf) { 602 case '*': 603 if (strnEQ(buf, "********", 8)) { 604 if (repl_beginning && repl_could_be_missing) { 605 repl_missing = true; 606 goto hunk_done; 607 } else 608 fatal("unexpected end of hunk " 609 "at line %ld\n", 610 p_input_line); 611 } 612 if (p_end != 0) { 613 if (repl_beginning && repl_could_be_missing) { 614 repl_missing = true; 615 goto hunk_done; 616 } 617 fatal("unexpected *** at line %ld: %s", 618 p_input_line, buf); 619 } 620 context = 0; 621 p_line[p_end] = savestr(buf); 622 if (out_of_mem) { 623 p_end--; 624 return false; 625 } 626 for (s = buf; 627 *s && !isdigit((unsigned char)*s); s++) 628 ; 629 if (!*s) 630 malformed(); 631 if (strnEQ(s, "0,0", 3)) 632 memmove(s, s + 2, strlen(s + 2) + 1); 633 p_first = strtolinenum(s, &s); 634 if (*s == ',') { 635 for (; 636 *s && !isdigit((unsigned char)*s); s++) 637 ; 638 if (!*s) 639 malformed(); 640 p_ptrn_lines = strtolinenum(s, &s) - p_first + 1; 641 if (p_ptrn_lines < 0) 642 malformed(); 643 } else if (p_first) 644 p_ptrn_lines = 1; 645 else { 646 p_ptrn_lines = 0; 647 p_first = 1; 648 } 649 if (p_first >= LINENUM_MAX - p_ptrn_lines || 650 p_ptrn_lines >= LINENUM_MAX - 6) 651 malformed(); 652 653 /* we need this much at least */ 654 p_max = p_ptrn_lines + 6; 655 while (p_max >= hunkmax) 656 grow_hunkmax(); 657 p_max = hunkmax; 658 break; 659 case '-': 660 if (buf[1] == '-') { 661 if (repl_beginning || 662 (p_end != p_ptrn_lines + 1 + 663 (p_char[p_end - 1] == '\n'))) { 664 if (p_end == 1) { 665 /* 666 * `old' lines were omitted; 667 * set up to fill them in 668 * from 'new' context lines. 669 */ 670 p_end = p_ptrn_lines + 1; 671 fillsrc = p_end + 1; 672 filldst = 1; 673 fillcnt = p_ptrn_lines; 674 } else { 675 if (repl_beginning) { 676 if (repl_could_be_missing) { 677 repl_missing = true; 678 goto hunk_done; 679 } 680 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 681 p_input_line, p_hunk_beg + repl_beginning); 682 } else { 683 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 684 (p_end <= p_ptrn_lines 685 ? "Premature" 686 : "Overdue"), 687 p_input_line, p_hunk_beg); 688 } 689 } 690 } 691 repl_beginning = p_end; 692 repl_backtrack_position = ftello(pfp); 693 repl_patch_line = p_input_line; 694 p_line[p_end] = savestr(buf); 695 if (out_of_mem) { 696 p_end--; 697 return false; 698 } 699 p_char[p_end] = '='; 700 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 701 ; 702 if (!*s) 703 malformed(); 704 p_newfirst = strtolinenum(s, &s); 705 if (*s == ',') { 706 for (; *s && !isdigit((unsigned char)*s); s++) 707 ; 708 if (!*s) 709 malformed(); 710 p_repl_lines = strtolinenum(s, &s) - 711 p_newfirst + 1; 712 if (p_repl_lines < 0) 713 malformed(); 714 } else if (p_newfirst) 715 p_repl_lines = 1; 716 else { 717 p_repl_lines = 0; 718 p_newfirst = 1; 719 } 720 if (p_newfirst >= LINENUM_MAX - p_repl_lines || 721 p_repl_lines >= LINENUM_MAX - p_end) 722 malformed(); 723 p_max = p_repl_lines + p_end; 724 if (p_max > MAXHUNKSIZE) 725 fatal("hunk too large (%ld lines) at line %ld: %s", 726 p_max, p_input_line, buf); 727 while (p_max >= hunkmax) 728 grow_hunkmax(); 729 if (p_repl_lines != ptrn_copiable && 730 (p_context != 0 || p_repl_lines != 1)) 731 repl_could_be_missing = false; 732 break; 733 } 734 goto change_line; 735 case '+': 736 case '!': 737 repl_could_be_missing = false; 738 change_line: 739 if (buf[1] == '\n' && canonicalize) 740 strlcpy(buf + 1, " \n", buf_size - 1); 741 if (!isspace((unsigned char)buf[1]) && 742 buf[1] != '>' && buf[1] != '<' && 743 repl_beginning && repl_could_be_missing) { 744 repl_missing = true; 745 goto hunk_done; 746 } 747 if (context >= 0) { 748 if (context < p_context) 749 p_context = context; 750 context = -1000; 751 } 752 p_line[p_end] = savestr(buf + 2); 753 if (out_of_mem) { 754 p_end--; 755 return false; 756 } 757 if (p_end == p_ptrn_lines) { 758 if (remove_special_line()) { 759 int l; 760 761 l = strlen(p_line[p_end]) - 1; 762 (p_line[p_end])[l] = 0; 763 } 764 } 765 break; 766 case '\t': 767 case '\n': /* assume the 2 spaces got eaten */ 768 if (repl_beginning && repl_could_be_missing && 769 (!ptrn_spaces_eaten || 770 diff_type == NEW_CONTEXT_DIFF)) { 771 repl_missing = true; 772 goto hunk_done; 773 } 774 p_line[p_end] = savestr(buf); 775 if (out_of_mem) { 776 p_end--; 777 return false; 778 } 779 if (p_end != p_ptrn_lines + 1) { 780 ptrn_spaces_eaten |= (repl_beginning != 0); 781 context++; 782 if (!repl_beginning) 783 ptrn_copiable++; 784 p_char[p_end] = ' '; 785 } 786 break; 787 case ' ': 788 if (!isspace((unsigned char)buf[1]) && 789 repl_beginning && repl_could_be_missing) { 790 repl_missing = true; 791 goto hunk_done; 792 } 793 context++; 794 if (!repl_beginning) 795 ptrn_copiable++; 796 p_line[p_end] = savestr(buf + 2); 797 if (out_of_mem) { 798 p_end--; 799 return false; 800 } 801 break; 802 default: 803 if (repl_beginning && repl_could_be_missing) { 804 repl_missing = true; 805 goto hunk_done; 806 } 807 malformed(); 808 } 809 /* set up p_len for strncmp() so we don't have to */ 810 /* assume null termination */ 811 if (p_line[p_end]) 812 p_len[p_end] = strlen(p_line[p_end]); 813 else 814 p_len[p_end] = 0; 815 } 816 817 hunk_done: 818 if (p_end >= 0 && !repl_beginning) 819 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 820 821 if (repl_missing) { 822 823 /* reset state back to just after --- */ 824 p_input_line = repl_patch_line; 825 for (p_end--; p_end > repl_beginning; p_end--) 826 free(p_line[p_end]); 827 fseeko(pfp, repl_backtrack_position, SEEK_SET); 828 829 /* redundant 'new' context lines were omitted - set */ 830 /* up to fill them in from the old file context */ 831 if (!p_context && p_repl_lines == 1) { 832 p_repl_lines = 0; 833 p_max--; 834 } 835 fillsrc = 1; 836 filldst = repl_beginning + 1; 837 fillcnt = p_repl_lines; 838 p_end = p_max; 839 } else if (!p_context && fillcnt == 1) { 840 /* the first hunk was a null hunk with no context */ 841 /* and we were expecting one line -- fix it up. */ 842 while (filldst < p_end) { 843 p_line[filldst] = p_line[filldst + 1]; 844 p_char[filldst] = p_char[filldst + 1]; 845 p_len[filldst] = p_len[filldst + 1]; 846 filldst++; 847 } 848 #if 0 849 repl_beginning--; /* this doesn't need to be fixed */ 850 #endif 851 p_end--; 852 p_first++; /* do append rather than insert */ 853 fillcnt = 0; 854 p_ptrn_lines = 0; 855 } 856 if (diff_type == CONTEXT_DIFF && 857 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 858 if (verbose) 859 say("%s\n%s\n%s\n", 860 "(Fascinating--this is really a new-style context diff but without", 861 "the telltale extra asterisks on the *** line that usually indicate", 862 "the new style...)"); 863 diff_type = NEW_CONTEXT_DIFF; 864 } 865 /* if there were omitted context lines, fill them in now */ 866 if (fillcnt) { 867 p_bfake = filldst; /* remember where not to free() */ 868 p_efake = filldst + fillcnt - 1; 869 while (fillcnt-- > 0) { 870 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 871 fillsrc++; 872 if (fillsrc > p_end) 873 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 874 p_hunk_beg); 875 p_line[filldst] = p_line[fillsrc]; 876 p_char[filldst] = p_char[fillsrc]; 877 p_len[filldst] = p_len[fillsrc]; 878 fillsrc++; 879 filldst++; 880 } 881 while (fillsrc <= p_end && fillsrc != repl_beginning && 882 p_char[fillsrc] != ' ') 883 fillsrc++; 884 #ifdef DEBUGGING 885 if (debug & 64) 886 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 887 fillsrc, filldst, repl_beginning, p_end + 1); 888 #endif 889 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 890 malformed(); 891 if (filldst != p_end + 1 && filldst != repl_beginning) 892 malformed(); 893 } 894 if (p_line[p_end] != NULL) { 895 if (remove_special_line()) { 896 p_len[p_end] -= 1; 897 (p_line[p_end])[p_len[p_end]] = 0; 898 } 899 } 900 } else if (diff_type == UNI_DIFF) { 901 LINENUM fillold; /* index of old lines */ 902 LINENUM fillnew; /* index of new lines */ 903 char ch; 904 905 line_beginning = ftello(pfp); /* file pos of the current line */ 906 len = pgets(true); 907 p_input_line++; 908 if (len == 0 || strnNE(buf, "@@ -", 4)) { 909 next_intuit_at(line_beginning, p_input_line); 910 return false; 911 } 912 s = buf + 4; 913 if (!*s) 914 malformed(); 915 p_first = strtolinenum(s, &s); 916 if (*s == ',') { 917 p_ptrn_lines = strtolinenum(s + 1, &s); 918 } else 919 p_ptrn_lines = 1; 920 if (*s == ' ') 921 s++; 922 if (*s != '+' || !*++s) 923 malformed(); 924 p_newfirst = strtolinenum(s, &s); 925 if (*s == ',') { 926 p_repl_lines = strtolinenum(s + 1, &s); 927 } else 928 p_repl_lines = 1; 929 if (*s == ' ') 930 s++; 931 if (*s != '@') 932 malformed(); 933 if (p_first >= LINENUM_MAX - p_ptrn_lines || 934 p_newfirst > LINENUM_MAX - p_repl_lines || 935 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 936 malformed(); 937 if (!p_ptrn_lines) 938 p_first++; /* do append rather than insert */ 939 p_max = p_ptrn_lines + p_repl_lines + 1; 940 while (p_max >= hunkmax) 941 grow_hunkmax(); 942 fillold = 1; 943 fillnew = fillold + p_ptrn_lines; 944 p_end = fillnew + p_repl_lines; 945 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 946 p_first + p_ptrn_lines - 1); 947 p_line[0] = savestr(buf); 948 if (out_of_mem) { 949 p_end = -1; 950 return false; 951 } 952 p_char[0] = '*'; 953 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 954 p_newfirst + p_repl_lines - 1); 955 p_line[fillnew] = savestr(buf); 956 if (out_of_mem) { 957 p_end = 0; 958 return false; 959 } 960 p_char[fillnew++] = '='; 961 p_context = 100; 962 context = 0; 963 p_hunk_beg = p_input_line + 1; 964 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 965 line_beginning = ftello(pfp); 966 len = pgets(true); 967 p_input_line++; 968 if (len == 0) { 969 if (p_max - fillnew < 3) { 970 /* assume blank lines got chopped */ 971 strlcpy(buf, " \n", buf_size); 972 } else { 973 fatal("unexpected end of file in patch\n"); 974 } 975 } 976 if (*buf == '\t' || *buf == '\n') { 977 ch = ' '; /* assume the space got eaten */ 978 s = savestr(buf); 979 } else { 980 ch = *buf; 981 s = savestr(buf + 1); 982 } 983 if (out_of_mem) { 984 while (--fillnew > p_ptrn_lines) 985 free(p_line[fillnew]); 986 p_end = fillold - 1; 987 return false; 988 } 989 switch (ch) { 990 case '-': 991 if (fillold > p_ptrn_lines) { 992 free(s); 993 p_end = fillnew - 1; 994 malformed(); 995 } 996 p_char[fillold] = ch; 997 p_line[fillold] = s; 998 p_len[fillold++] = strlen(s); 999 if (fillold > p_ptrn_lines) { 1000 if (remove_special_line()) { 1001 p_len[fillold - 1] -= 1; 1002 s[p_len[fillold - 1]] = 0; 1003 } 1004 } 1005 break; 1006 case '=': 1007 ch = ' '; 1008 /* FALL THROUGH */ 1009 case ' ': 1010 if (fillold > p_ptrn_lines) { 1011 free(s); 1012 while (--fillnew > p_ptrn_lines) 1013 free(p_line[fillnew]); 1014 p_end = fillold - 1; 1015 malformed(); 1016 } 1017 context++; 1018 p_char[fillold] = ch; 1019 p_line[fillold] = s; 1020 p_len[fillold++] = strlen(s); 1021 s = savestr(s); 1022 if (out_of_mem) { 1023 while (--fillnew > p_ptrn_lines) 1024 free(p_line[fillnew]); 1025 p_end = fillold - 1; 1026 return false; 1027 } 1028 if (fillold > p_ptrn_lines) { 1029 if (remove_special_line()) { 1030 p_len[fillold - 1] -= 1; 1031 s[p_len[fillold - 1]] = 0; 1032 } 1033 } 1034 /* FALL THROUGH */ 1035 case '+': 1036 if (fillnew > p_end) { 1037 free(s); 1038 while (--fillnew > p_ptrn_lines) 1039 free(p_line[fillnew]); 1040 p_end = fillold - 1; 1041 malformed(); 1042 } 1043 p_char[fillnew] = ch; 1044 p_line[fillnew] = s; 1045 p_len[fillnew++] = strlen(s); 1046 if (fillold > p_ptrn_lines) { 1047 if (remove_special_line()) { 1048 p_len[fillnew - 1] -= 1; 1049 s[p_len[fillnew - 1]] = 0; 1050 } 1051 } 1052 break; 1053 default: 1054 p_end = fillnew; 1055 malformed(); 1056 } 1057 if (ch != ' ' && context > 0) { 1058 if (context < p_context) 1059 p_context = context; 1060 context = -1000; 1061 } 1062 } /* while */ 1063 } else { /* normal diff--fake it up */ 1064 char hunk_type; 1065 int i; 1066 LINENUM min, max; 1067 1068 line_beginning = ftello(pfp); 1069 p_context = 0; 1070 len = pgets(true); 1071 p_input_line++; 1072 if (len == 0 || !isdigit((unsigned char)*buf)) { 1073 next_intuit_at(line_beginning, p_input_line); 1074 return false; 1075 } 1076 p_first = strtolinenum(buf, &s); 1077 if (*s == ',') { 1078 p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1; 1079 if (p_ptrn_lines < 0) 1080 malformed(); 1081 } else 1082 p_ptrn_lines = (*s != 'a'); 1083 hunk_type = *s; 1084 if (hunk_type == 'a') 1085 p_first++; /* do append rather than insert */ 1086 min = strtolinenum(s + 1, &s); 1087 if (*s == ',') 1088 max = strtolinenum(s + 1, &s); 1089 else 1090 max = min; 1091 if (min < 0 || min > max || max - min == LINENUM_MAX) 1092 malformed(); 1093 if (hunk_type == 'd') 1094 min++; 1095 p_newfirst = min; 1096 p_repl_lines = max - min + 1; 1097 if (p_newfirst > LINENUM_MAX - p_repl_lines || 1098 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1099 malformed(); 1100 p_end = p_ptrn_lines + p_repl_lines + 1; 1101 if (p_end > MAXHUNKSIZE) 1102 fatal("hunk too large (%ld lines) at line %ld: %s", 1103 p_end, p_input_line, buf); 1104 while (p_end >= hunkmax) 1105 grow_hunkmax(); 1106 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1107 p_first + p_ptrn_lines - 1); 1108 p_line[0] = savestr(buf); 1109 if (out_of_mem) { 1110 p_end = -1; 1111 return false; 1112 } 1113 p_char[0] = '*'; 1114 for (i = 1; i <= p_ptrn_lines; i++) { 1115 len = pgets(true); 1116 p_input_line++; 1117 if (len == 0) 1118 fatal("unexpected end of file in patch at line %ld\n", 1119 p_input_line); 1120 if (*buf != '<') 1121 fatal("< expected at line %ld of patch\n", 1122 p_input_line); 1123 p_line[i] = savestr(buf + 2); 1124 if (out_of_mem) { 1125 p_end = i - 1; 1126 return false; 1127 } 1128 p_len[i] = strlen(p_line[i]); 1129 p_char[i] = '-'; 1130 } 1131 1132 if (remove_special_line()) { 1133 p_len[i - 1] -= 1; 1134 (p_line[i - 1])[p_len[i - 1]] = 0; 1135 } 1136 if (hunk_type == 'c') { 1137 len = pgets(true); 1138 p_input_line++; 1139 if (len == 0) 1140 fatal("unexpected end of file in patch at line %ld\n", 1141 p_input_line); 1142 if (*buf != '-') 1143 fatal("--- expected at line %ld of patch\n", 1144 p_input_line); 1145 } 1146 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1147 p_line[i] = savestr(buf); 1148 if (out_of_mem) { 1149 p_end = i - 1; 1150 return false; 1151 } 1152 p_char[i] = '='; 1153 for (i++; i <= p_end; i++) { 1154 len = pgets(true); 1155 p_input_line++; 1156 if (len == 0) 1157 fatal("unexpected end of file in patch at line %ld\n", 1158 p_input_line); 1159 if (*buf != '>') 1160 fatal("> expected at line %ld of patch\n", 1161 p_input_line); 1162 /* Don't overrun if we don't have enough line */ 1163 if (len > 2) 1164 p_line[i] = savestr(buf + 2); 1165 else 1166 p_line[i] = savestr(""); 1167 1168 if (out_of_mem) { 1169 p_end = i - 1; 1170 return false; 1171 } 1172 p_len[i] = strlen(p_line[i]); 1173 p_char[i] = '+'; 1174 } 1175 1176 if (remove_special_line()) { 1177 p_len[i - 1] -= 1; 1178 (p_line[i - 1])[p_len[i - 1]] = 0; 1179 } 1180 } 1181 if (reverse) /* backwards patch? */ 1182 if (!pch_swap()) 1183 say("Not enough memory to swap next hunk!\n"); 1184 #ifdef DEBUGGING 1185 if (debug & 2) { 1186 LINENUM i; 1187 char special; 1188 1189 for (i = 0; i <= p_end; i++) { 1190 if (i == p_ptrn_lines) 1191 special = '^'; 1192 else 1193 special = ' '; 1194 fprintf(stderr, "%3ld %c %c %s", i, p_char[i], 1195 special, p_line[i]); 1196 fflush(stderr); 1197 } 1198 } 1199 #endif 1200 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1201 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1202 return true; 1203 } 1204 1205 /* 1206 * Input a line from the patch file. 1207 * Worry about indentation if do_indent is true. 1208 * The line is read directly into the buf global variable which 1209 * is resized if necessary in order to hold the complete line. 1210 * Returns the number of characters read including the terminating 1211 * '\n', if any. 1212 */ 1213 size_t 1214 pgets(bool do_indent) 1215 { 1216 char *line = NULL; 1217 ssize_t len = 0; 1218 size_t buflen = 0; 1219 int indent = 0, skipped = 0; 1220 1221 if ((len = getline(&line, &buflen, pfp)) >= 0) { 1222 char *linep = line; 1223 if ((size_t)(len + 1) > buf_size) { 1224 while ((size_t)(len + 1) > buf_size) 1225 buf_size *= 2; 1226 free(buf); 1227 buf = malloc(buf_size); 1228 if (buf == NULL) 1229 fatal("out of memory\n"); 1230 } 1231 if (do_indent == 1 && p_indent) { 1232 for (; 1233 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1234 line++, skipped++) { 1235 if (*line == '\t') 1236 indent += 8 - (indent %7); 1237 else 1238 indent++; 1239 } 1240 } 1241 memcpy(buf, line, len - skipped); 1242 buf[len - skipped] = '\0'; 1243 line = linep; 1244 } 1245 free(line); 1246 return (len > 0) ? len : 0; 1247 } 1248 1249 1250 /* 1251 * Reverse the old and new portions of the current hunk. 1252 */ 1253 bool 1254 pch_swap(void) 1255 { 1256 char **tp_line; /* the text of the hunk */ 1257 size_t *tp_len; /* length of each line */ 1258 char *tp_char; /* +, -, and ! */ 1259 LINENUM i; 1260 LINENUM n; 1261 bool blankline = false; 1262 char *s; 1263 1264 i = p_first; 1265 p_first = p_newfirst; 1266 p_newfirst = i; 1267 1268 /* make a scratch copy */ 1269 1270 tp_line = p_line; 1271 tp_len = p_len; 1272 tp_char = p_char; 1273 p_line = NULL; /* force set_hunkmax to allocate again */ 1274 p_len = NULL; 1275 p_char = NULL; 1276 set_hunkmax(); 1277 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1278 1279 free(p_line); 1280 p_line = tp_line; 1281 free(p_len); 1282 p_len = tp_len; 1283 free(p_char); 1284 p_char = tp_char; 1285 return false; /* not enough memory to swap hunk! */ 1286 } 1287 /* now turn the new into the old */ 1288 1289 i = p_ptrn_lines + 1; 1290 if (tp_char[i] == '\n') { /* account for possible blank line */ 1291 blankline = true; 1292 i++; 1293 } 1294 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1295 if (p_efake <= i) 1296 n = p_end - i + 1; 1297 else 1298 n = -i; 1299 p_efake += n; 1300 p_bfake += n; 1301 } 1302 for (n = 0; i <= p_end; i++, n++) { 1303 p_line[n] = tp_line[i]; 1304 p_char[n] = tp_char[i]; 1305 if (p_char[n] == '+') 1306 p_char[n] = '-'; 1307 p_len[n] = tp_len[i]; 1308 } 1309 if (blankline) { 1310 i = p_ptrn_lines + 1; 1311 p_line[n] = tp_line[i]; 1312 p_char[n] = tp_char[i]; 1313 p_len[n] = tp_len[i]; 1314 n++; 1315 } 1316 if (p_char[0] != '=') 1317 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1318 p_input_line, p_char[0]); 1319 p_char[0] = '*'; 1320 for (s = p_line[0]; *s; s++) 1321 if (*s == '-') 1322 *s = '*'; 1323 1324 /* now turn the old into the new */ 1325 1326 if (p_char[0] != '*') 1327 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1328 p_input_line, p_char[0]); 1329 tp_char[0] = '='; 1330 for (s = tp_line[0]; *s; s++) 1331 if (*s == '*') 1332 *s = '-'; 1333 for (i = 0; n <= p_end; i++, n++) { 1334 p_line[n] = tp_line[i]; 1335 p_char[n] = tp_char[i]; 1336 if (p_char[n] == '-') 1337 p_char[n] = '+'; 1338 p_len[n] = tp_len[i]; 1339 } 1340 1341 if (i != p_ptrn_lines + 1) 1342 fatal("Malformed patch at line %ld: expected %ld lines, " 1343 "got %ld\n", 1344 p_input_line, p_ptrn_lines + 1, i); 1345 1346 i = p_ptrn_lines; 1347 p_ptrn_lines = p_repl_lines; 1348 p_repl_lines = i; 1349 1350 free(tp_line); 1351 free(tp_len); 1352 free(tp_char); 1353 1354 return true; 1355 } 1356 1357 /* 1358 * Return the specified line position in the old file of the old context. 1359 */ 1360 LINENUM 1361 pch_first(void) 1362 { 1363 return p_first; 1364 } 1365 1366 /* 1367 * Return the number of lines of old context. 1368 */ 1369 LINENUM 1370 pch_ptrn_lines(void) 1371 { 1372 return p_ptrn_lines; 1373 } 1374 1375 /* 1376 * Return the probable line position in the new file of the first line. 1377 */ 1378 LINENUM 1379 pch_newfirst(void) 1380 { 1381 return p_newfirst; 1382 } 1383 1384 /* 1385 * Return the number of lines in the replacement text including context. 1386 */ 1387 LINENUM 1388 pch_repl_lines(void) 1389 { 1390 return p_repl_lines; 1391 } 1392 1393 /* 1394 * Return the number of lines in the whole hunk. 1395 */ 1396 LINENUM 1397 pch_end(void) 1398 { 1399 return p_end; 1400 } 1401 1402 /* 1403 * Return the number of context lines before the first changed line. 1404 */ 1405 LINENUM 1406 pch_context(void) 1407 { 1408 return p_context; 1409 } 1410 1411 /* 1412 * Return the length of a particular patch line. 1413 */ 1414 size_t 1415 pch_line_len(LINENUM line) 1416 { 1417 return p_len[line]; 1418 } 1419 1420 /* 1421 * Return the control character (+, -, *, !, etc) for a patch line. 1422 */ 1423 char 1424 pch_char(LINENUM line) 1425 { 1426 return p_char[line]; 1427 } 1428 1429 /* 1430 * Return a pointer to a particular patch line. 1431 */ 1432 char * 1433 pfetch(LINENUM line) 1434 { 1435 return p_line[line]; 1436 } 1437 1438 /* 1439 * Return where in the patch file this hunk began, for error messages. 1440 */ 1441 LINENUM 1442 pch_hunk_beg(void) 1443 { 1444 return p_hunk_beg; 1445 } 1446 1447 /* 1448 * Apply an ed script by feeding ed itself. 1449 */ 1450 void 1451 do_ed_script(void) 1452 { 1453 char *t; 1454 off_t beginning_of_this_line; 1455 FILE *pipefp = NULL; 1456 int continuation; 1457 1458 if (!skip_rest_of_patch) { 1459 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1460 unlink(TMPOUTNAME); 1461 fatal("can't create temp file %s", TMPOUTNAME); 1462 } 1463 snprintf(buf, buf_size, "%s%s%s", _PATH_RED, 1464 verbose ? " " : " -s ", TMPOUTNAME); 1465 pipefp = popen(buf, "w"); 1466 } 1467 for (;;) { 1468 beginning_of_this_line = ftello(pfp); 1469 if (pgets(true) == 0) { 1470 next_intuit_at(beginning_of_this_line, p_input_line); 1471 break; 1472 } 1473 p_input_line++; 1474 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1475 ; 1476 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1477 if (isdigit((unsigned char)*buf) && 1478 (*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) { 1479 if (pipefp != NULL) 1480 fputs(buf, pipefp); 1481 if (*t == 's') { 1482 for (;;) { 1483 continuation = 0; 1484 t = strchr(buf, '\0') - 1; 1485 while (--t >= buf && *t == '\\') 1486 continuation = !continuation; 1487 if (!continuation || 1488 pgets(true) == 0) 1489 break; 1490 if (pipefp != NULL) 1491 fputs(buf, pipefp); 1492 } 1493 } else if (*t != 'd') { 1494 while (pgets(true)) { 1495 p_input_line++; 1496 if (pipefp != NULL) 1497 fputs(buf, pipefp); 1498 if (strEQ(buf, ".\n")) 1499 break; 1500 } 1501 } 1502 } else { 1503 next_intuit_at(beginning_of_this_line, p_input_line); 1504 break; 1505 } 1506 } 1507 if (pipefp == NULL) 1508 return; 1509 fprintf(pipefp, "w\n"); 1510 fprintf(pipefp, "q\n"); 1511 fflush(pipefp); 1512 pclose(pipefp); 1513 ignore_signals(); 1514 if (!check_only) { 1515 if (move_file(TMPOUTNAME, outname) < 0) { 1516 toutkeep = true; 1517 chmod(TMPOUTNAME, filemode); 1518 } else 1519 chmod(outname, filemode); 1520 } 1521 set_signals(1); 1522 } 1523 1524 /* 1525 * Choose the name of the file to be patched based on POSIX rules. 1526 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1527 * if the user specified --posix or set POSIXLY_CORRECT. 1528 */ 1529 static char * 1530 posix_name(const struct file_name *names, bool assume_exists) 1531 { 1532 char *path = NULL; 1533 int i; 1534 1535 /* 1536 * POSIX states that the filename will be chosen from one 1537 * of the old, new and index names (in that order) if 1538 * the file exists relative to CWD after -p stripping. 1539 */ 1540 for (i = 0; i < MAX_FILE; i++) { 1541 if (names[i].path != NULL && names[i].exists) { 1542 path = names[i].path; 1543 break; 1544 } 1545 } 1546 if (path == NULL && !assume_exists) { 1547 /* 1548 * No files found, check to see if the diff could be 1549 * creating a new file. 1550 */ 1551 if (path == NULL && ok_to_create_file && 1552 names[NEW_FILE].path != NULL) 1553 path = names[NEW_FILE].path; 1554 } 1555 1556 return path ? xstrdup(path) : NULL; 1557 } 1558 1559 static char * 1560 compare_names(const struct file_name *names, bool assume_exists) 1561 { 1562 size_t min_components, min_baselen, min_len, tmp; 1563 char *best = NULL; 1564 char *path; 1565 int i; 1566 1567 /* 1568 * The "best" name is the one with the fewest number of path 1569 * components, the shortest basename length, and the shortest 1570 * overall length (in that order). We only use the Index: file 1571 * if neither of the old or new files could be intuited from 1572 * the diff header. 1573 */ 1574 min_components = min_baselen = min_len = SIZE_MAX; 1575 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1576 path = names[i].path; 1577 if (path == NULL || (!names[i].exists && !assume_exists)) 1578 continue; 1579 if ((tmp = num_components(path)) > min_components) 1580 continue; 1581 if (tmp < min_components) { 1582 min_components = tmp; 1583 best = path; 1584 } 1585 if ((tmp = strlen(basename(path))) > min_baselen) 1586 continue; 1587 if (tmp < min_baselen) { 1588 min_baselen = tmp; 1589 best = path; 1590 } 1591 if ((tmp = strlen(path)) > min_len) 1592 continue; 1593 min_len = tmp; 1594 best = path; 1595 } 1596 return best; 1597 } 1598 1599 /* 1600 * Choose the name of the file to be patched based the "best" one 1601 * available. 1602 */ 1603 static char * 1604 best_name(const struct file_name *names, bool assume_exists) 1605 { 1606 char *best; 1607 1608 best = compare_names(names, assume_exists); 1609 1610 /* No match? Check to see if the diff could be creating a new file. */ 1611 if (best == NULL && ok_to_create_file) 1612 best = names[NEW_FILE].path; 1613 1614 return best ? xstrdup(best) : NULL; 1615 } 1616 1617 static size_t 1618 num_components(const char *path) 1619 { 1620 size_t n; 1621 const char *cp; 1622 1623 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++) { 1624 cp++; 1625 while (*cp == '/') 1626 cp++; /* skip consecutive slashes */ 1627 } 1628 return n; 1629 } 1630 1631 /* 1632 * Convert number at NPTR into LINENUM and save address of first 1633 * character that is not a digit in ENDPTR. If conversion is not 1634 * possible, call fatal. 1635 */ 1636 static LINENUM 1637 strtolinenum(char *nptr, char **endptr) 1638 { 1639 LINENUM rv; 1640 char c; 1641 char *p; 1642 const char *errstr; 1643 1644 for (p = nptr; isdigit((unsigned char)*p); p++) 1645 ; 1646 1647 if (p == nptr) 1648 malformed(); 1649 1650 c = *p; 1651 *p = '\0'; 1652 1653 rv = strtonum(nptr, 0, LINENUM_MAX, &errstr); 1654 if (errstr != NULL) 1655 fatal("invalid line number at line %ld: `%s' is %s\n", 1656 p_input_line, nptr, errstr); 1657 1658 *p = c; 1659 *endptr = p; 1660 1661 return rv; 1662 } 1663