1 /*- 2 * Copyright 1986, Larry Wall 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following condition is met: 6 * 1. Redistributions of source code must retain the above copyright notice, 7 * this condition and the following disclaimer. 8 * 9 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 10 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 11 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 12 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 13 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 14 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 15 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 16 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 17 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 18 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 19 * SUCH DAMAGE. 20 * 21 * patch - a program to apply diffs to original files 22 * 23 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 24 * behaviour 25 * 26 * $OpenBSD: pch.c,v 1.43 2014/11/18 17:03:35 tobias Exp $ 27 * $FreeBSD$ 28 */ 29 30 #include <sys/types.h> 31 #include <sys/stat.h> 32 33 #include <ctype.h> 34 #include <libgen.h> 35 #include <limits.h> 36 #include <stdint.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 #include "common.h" 43 #include "util.h" 44 #include "pch.h" 45 #include "pathnames.h" 46 47 /* Patch (diff listing) abstract type. */ 48 49 static off_t p_filesize; /* size of the patch file */ 50 static LINENUM p_first; /* 1st line number */ 51 static LINENUM p_newfirst; /* 1st line number of replacement */ 52 static LINENUM p_ptrn_lines; /* # lines in pattern */ 53 static LINENUM p_repl_lines; /* # lines in replacement text */ 54 static LINENUM p_end = -1; /* last line in hunk */ 55 static LINENUM p_max; /* max allowed value of p_end */ 56 static LINENUM p_context = 3; /* # of context lines */ 57 static LINENUM p_input_line = 0; /* current line # from patch file */ 58 static char **p_line = NULL;/* the text of the hunk */ 59 static unsigned short *p_len = NULL; /* length of each line */ 60 static char *p_char = NULL; /* +, -, and ! */ 61 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 62 static int p_indent; /* indent to patch */ 63 static off_t p_base; /* where to intuit this time */ 64 static LINENUM p_bline; /* line # of p_base */ 65 static off_t p_start; /* where intuit found a patch */ 66 static LINENUM p_sline; /* and the line number for it */ 67 static LINENUM p_hunk_beg; /* line number of current hunk */ 68 static LINENUM p_efake = -1; /* end of faked up lines--don't free */ 69 static LINENUM p_bfake = -1; /* beg of faked up lines */ 70 static FILE *pfp = NULL; /* patch file pointer */ 71 static char *bestguess = NULL; /* guess at correct filename */ 72 73 static void grow_hunkmax(void); 74 static int intuit_diff_type(void); 75 static void next_intuit_at(off_t, LINENUM); 76 static void skip_to(off_t, LINENUM); 77 static size_t pgets(bool _do_indent); 78 static char *best_name(const struct file_name *, bool); 79 static char *posix_name(const struct file_name *, bool); 80 static size_t num_components(const char *); 81 static LINENUM strtolinenum(char *, char **); 82 83 /* 84 * Prepare to look for the next patch in the patch file. 85 */ 86 void 87 re_patch(void) 88 { 89 p_first = 0; 90 p_newfirst = 0; 91 p_ptrn_lines = 0; 92 p_repl_lines = 0; 93 p_end = (LINENUM) - 1; 94 p_max = 0; 95 p_indent = 0; 96 } 97 98 /* 99 * Open the patch file at the beginning of time. 100 */ 101 void 102 open_patch_file(const char *filename) 103 { 104 struct stat filestat; 105 int nr, nw; 106 107 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 108 pfp = fopen(TMPPATNAME, "w"); 109 if (pfp == NULL) 110 pfatal("can't create %s", TMPPATNAME); 111 while ((nr = fread(buf, 1, buf_size, stdin)) > 0) { 112 nw = fwrite(buf, 1, nr, pfp); 113 if (nr != nw) 114 pfatal("write error to %s", TMPPATNAME); 115 } 116 if (ferror(pfp) || fclose(pfp)) 117 pfatal("can't write %s", TMPPATNAME); 118 filename = TMPPATNAME; 119 } 120 pfp = fopen(filename, "r"); 121 if (pfp == NULL) 122 pfatal("patch file %s not found", filename); 123 if (fstat(fileno(pfp), &filestat)) 124 pfatal("can't stat %s", filename); 125 p_filesize = filestat.st_size; 126 next_intuit_at(0, 1L); /* start at the beginning */ 127 set_hunkmax(); 128 } 129 130 /* 131 * Make sure our dynamically realloced tables are malloced to begin with. 132 */ 133 void 134 set_hunkmax(void) 135 { 136 if (p_line == NULL) 137 p_line = malloc(hunkmax * sizeof(char *)); 138 if (p_len == NULL) 139 p_len = malloc(hunkmax * sizeof(unsigned short)); 140 if (p_char == NULL) 141 p_char = malloc(hunkmax * sizeof(char)); 142 } 143 144 /* 145 * Enlarge the arrays containing the current hunk of patch. 146 */ 147 static void 148 grow_hunkmax(void) 149 { 150 int new_hunkmax = hunkmax * 2; 151 152 if (p_line == NULL || p_len == NULL || p_char == NULL) 153 fatal("Internal memory allocation error\n"); 154 155 p_line = reallocf(p_line, new_hunkmax * sizeof(char *)); 156 p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short)); 157 p_char = reallocf(p_char, new_hunkmax * sizeof(char)); 158 159 if (p_line != NULL && p_len != NULL && p_char != NULL) { 160 hunkmax = new_hunkmax; 161 return; 162 } 163 164 if (!using_plan_a) 165 fatal("out of memory\n"); 166 out_of_mem = true; /* whatever is null will be allocated again */ 167 /* from within plan_a(), of all places */ 168 } 169 170 /* True if the remainder of the patch file contains a diff of some sort. */ 171 172 bool 173 there_is_another_patch(void) 174 { 175 bool exists = false; 176 177 if (p_base != 0 && p_base >= p_filesize) { 178 if (verbose) 179 say("done\n"); 180 return false; 181 } 182 if (verbose) 183 say("Hmm..."); 184 diff_type = intuit_diff_type(); 185 if (!diff_type) { 186 if (p_base != 0) { 187 if (verbose) 188 say(" Ignoring the trailing garbage.\ndone\n"); 189 } else 190 say(" I can't seem to find a patch in there anywhere.\n"); 191 return false; 192 } 193 if (verbose) 194 say(" %sooks like %s to me...\n", 195 (p_base == 0 ? "L" : "The next patch l"), 196 diff_type == UNI_DIFF ? "a unified diff" : 197 diff_type == CONTEXT_DIFF ? "a context diff" : 198 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 199 diff_type == NORMAL_DIFF ? "a normal diff" : 200 "an ed script"); 201 if (p_indent && verbose) 202 say("(Patch is indented %d space%s.)\n", p_indent, 203 p_indent == 1 ? "" : "s"); 204 skip_to(p_start, p_sline); 205 while (filearg[0] == NULL) { 206 if (force || batch) { 207 say("No file to patch. Skipping...\n"); 208 filearg[0] = xstrdup(bestguess); 209 skip_rest_of_patch = true; 210 return true; 211 } 212 ask("File to patch: "); 213 if (*buf != '\n') { 214 free(bestguess); 215 bestguess = xstrdup(buf); 216 filearg[0] = fetchname(buf, &exists, 0); 217 } 218 if (!exists) { 219 int def_skip = *bestguess == '\0'; 220 ask("No file found--skip this patch? [%c] ", 221 def_skip ? 'y' : 'n'); 222 if (*buf == 'n' || (!def_skip && *buf != 'y')) 223 continue; 224 if (verbose) 225 say("Skipping patch...\n"); 226 free(filearg[0]); 227 filearg[0] = fetchname(bestguess, &exists, 0); 228 skip_rest_of_patch = true; 229 return true; 230 } 231 } 232 return true; 233 } 234 235 static void 236 p4_fetchname(struct file_name *name, char *str) 237 { 238 char *t, *h; 239 240 /* Skip leading whitespace. */ 241 while (isspace((unsigned char)*str)) 242 str++; 243 244 /* Remove the file revision number. */ 245 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 246 if (*t == '#') 247 h = t; 248 if (h != NULL) 249 *h = '\0'; 250 251 name->path = fetchname(str, &name->exists, strippath); 252 } 253 254 /* Determine what kind of diff is in the remaining part of the patch file. */ 255 256 static int 257 intuit_diff_type(void) 258 { 259 off_t this_line = 0, previous_line; 260 off_t first_command_line = -1; 261 LINENUM fcl_line = -1; 262 bool last_line_was_command = false, this_is_a_command = false; 263 bool stars_last_line = false, stars_this_line = false; 264 char *s, *t; 265 int indent, retval; 266 struct file_name names[MAX_FILE]; 267 int piece_of_git = 0; 268 269 memset(names, 0, sizeof(names)); 270 ok_to_create_file = false; 271 fseeko(pfp, p_base, SEEK_SET); 272 p_input_line = p_bline - 1; 273 for (;;) { 274 previous_line = this_line; 275 last_line_was_command = this_is_a_command; 276 stars_last_line = stars_this_line; 277 this_line = ftello(pfp); 278 indent = 0; 279 p_input_line++; 280 if (pgets(false) == 0) { 281 if (first_command_line >= 0) { 282 /* nothing but deletes!? */ 283 p_start = first_command_line; 284 p_sline = fcl_line; 285 retval = ED_DIFF; 286 goto scan_exit; 287 } else { 288 p_start = this_line; 289 p_sline = p_input_line; 290 retval = 0; 291 goto scan_exit; 292 } 293 } 294 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 295 if (*s == '\t') 296 indent += 8 - (indent % 8); 297 else 298 indent++; 299 } 300 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 301 ; 302 this_is_a_command = (isdigit((unsigned char)*s) && 303 (*t == 'd' || *t == 'c' || *t == 'a')); 304 if (first_command_line < 0 && this_is_a_command) { 305 first_command_line = this_line; 306 fcl_line = p_input_line; 307 p_indent = indent; /* assume this for now */ 308 } 309 if (!stars_last_line && strnEQ(s, "*** ", 4)) 310 names[OLD_FILE].path = fetchname(s + 4, 311 &names[OLD_FILE].exists, strippath); 312 else if (strnEQ(s, "--- ", 4)) { 313 size_t off = 4; 314 if (piece_of_git && strippath == 957 && 315 strnEQ(s, "--- a/", 6)) 316 off = 6; 317 names[NEW_FILE].path = fetchname(s + off, 318 &names[NEW_FILE].exists, strippath); 319 } else if (strnEQ(s, "+++ ", 4)) { 320 /* pretend it is the old name */ 321 size_t off = 4; 322 if (piece_of_git && strippath == 957 && 323 strnEQ(s, "+++ b/", 6)) 324 off = 6; 325 names[OLD_FILE].path = fetchname(s + off, 326 &names[OLD_FILE].exists, strippath); 327 } else if (strnEQ(s, "Index:", 6)) 328 names[INDEX_FILE].path = fetchname(s + 6, 329 &names[INDEX_FILE].exists, strippath); 330 else if (strnEQ(s, "Prereq:", 7)) { 331 for (t = s + 7; isspace((unsigned char)*t); t++) 332 ; 333 revision = xstrdup(t); 334 for (t = revision; 335 *t && !isspace((unsigned char)*t); t++) 336 ; 337 *t = '\0'; 338 if (*revision == '\0') { 339 free(revision); 340 revision = NULL; 341 } 342 } else if (strnEQ(s, "diff --git a/", 13)) { 343 /* Git-style diffs. */ 344 piece_of_git = 1; 345 } else if (strnEQ(s, "==== ", 5)) { 346 /* Perforce-style diffs. */ 347 if ((t = strstr(s + 5, " - ")) != NULL) 348 p4_fetchname(&names[NEW_FILE], t + 3); 349 p4_fetchname(&names[OLD_FILE], s + 5); 350 } 351 if ((!diff_type || diff_type == ED_DIFF) && 352 first_command_line >= 0 && 353 strEQ(s, ".\n")) { 354 p_indent = indent; 355 p_start = first_command_line; 356 p_sline = fcl_line; 357 retval = ED_DIFF; 358 goto scan_exit; 359 } 360 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 361 if (strnEQ(s + 4, "0,0", 3)) 362 ok_to_create_file = true; 363 p_indent = indent; 364 p_start = this_line; 365 p_sline = p_input_line; 366 retval = UNI_DIFF; 367 goto scan_exit; 368 } 369 stars_this_line = strnEQ(s, "********", 8); 370 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 371 strnEQ(s, "*** ", 4)) { 372 if (strtolinenum(s + 4, &s) == 0) 373 ok_to_create_file = true; 374 /* 375 * If this is a new context diff the character just 376 * at the end of the line is a '*'. 377 */ 378 while (*s && *s != '\n') 379 s++; 380 p_indent = indent; 381 p_start = previous_line; 382 p_sline = p_input_line - 1; 383 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 384 goto scan_exit; 385 } 386 if ((!diff_type || diff_type == NORMAL_DIFF) && 387 last_line_was_command && 388 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 389 p_start = previous_line; 390 p_sline = p_input_line - 1; 391 p_indent = indent; 392 retval = NORMAL_DIFF; 393 goto scan_exit; 394 } 395 } 396 scan_exit: 397 if (retval == UNI_DIFF) { 398 /* unswap old and new */ 399 struct file_name tmp = names[OLD_FILE]; 400 names[OLD_FILE] = names[NEW_FILE]; 401 names[NEW_FILE] = tmp; 402 } 403 if (filearg[0] == NULL) { 404 if (posix) 405 filearg[0] = posix_name(names, ok_to_create_file); 406 else { 407 /* Ignore the Index: name for context diffs, like GNU */ 408 if (names[OLD_FILE].path != NULL || 409 names[NEW_FILE].path != NULL) { 410 free(names[INDEX_FILE].path); 411 names[INDEX_FILE].path = NULL; 412 } 413 filearg[0] = best_name(names, ok_to_create_file); 414 } 415 } 416 417 free(bestguess); 418 bestguess = NULL; 419 if (filearg[0] != NULL) 420 bestguess = xstrdup(filearg[0]); 421 else if (!ok_to_create_file) { 422 /* 423 * We don't want to create a new file but we need a 424 * filename to set bestguess. Avoid setting filearg[0] 425 * so the file is not created automatically. 426 */ 427 if (posix) 428 bestguess = posix_name(names, true); 429 else 430 bestguess = best_name(names, true); 431 } 432 free(names[OLD_FILE].path); 433 free(names[NEW_FILE].path); 434 free(names[INDEX_FILE].path); 435 return retval; 436 } 437 438 /* 439 * Remember where this patch ends so we know where to start up again. 440 */ 441 static void 442 next_intuit_at(off_t file_pos, LINENUM file_line) 443 { 444 p_base = file_pos; 445 p_bline = file_line; 446 } 447 448 /* 449 * Basically a verbose fseeko() to the actual diff listing. 450 */ 451 static void 452 skip_to(off_t file_pos, LINENUM file_line) 453 { 454 size_t len; 455 456 if (p_base > file_pos) 457 fatal("Internal error: seek %lld>%lld\n", 458 (long long)p_base, (long long)file_pos); 459 if (verbose && p_base < file_pos) { 460 fseeko(pfp, p_base, SEEK_SET); 461 say("The text leading up to this was:\n--------------------------\n"); 462 while (ftello(pfp) < file_pos) { 463 len = pgets(false); 464 if (len == 0) 465 fatal("Unexpected end of file\n"); 466 say("|%s", buf); 467 } 468 say("--------------------------\n"); 469 } else 470 fseeko(pfp, file_pos, SEEK_SET); 471 p_input_line = file_line - 1; 472 } 473 474 /* Make this a function for better debugging. */ 475 static void 476 malformed(void) 477 { 478 fatal("malformed patch at line %ld: %s", p_input_line, buf); 479 /* about as informative as "Syntax error" in C */ 480 } 481 482 /* 483 * True if the line has been discarded (i.e. it is a line saying 484 * "\ No newline at end of file".) 485 */ 486 static bool 487 remove_special_line(void) 488 { 489 int c; 490 491 c = fgetc(pfp); 492 if (c == '\\') { 493 do { 494 c = fgetc(pfp); 495 } while (c != EOF && c != '\n'); 496 497 return true; 498 } 499 if (c != EOF) 500 fseeko(pfp, -1, SEEK_CUR); 501 502 return false; 503 } 504 505 /* 506 * True if there is more of the current diff listing to process. 507 */ 508 bool 509 another_hunk(void) 510 { 511 off_t line_beginning; /* file pos of the current line */ 512 LINENUM repl_beginning; /* index of --- line */ 513 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 514 LINENUM fillsrc; /* index of first line to copy */ 515 LINENUM filldst; /* index of first missing line */ 516 bool ptrn_spaces_eaten; /* ptrn was slightly malformed */ 517 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 518 bool repl_missing; /* we are now backtracking */ 519 off_t repl_backtrack_position; /* file pos of first repl line */ 520 LINENUM repl_patch_line; /* input line number for same */ 521 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 522 char *s; 523 size_t len; 524 int context = 0; 525 526 while (p_end >= 0) { 527 if (p_end == p_efake) 528 p_end = p_bfake; /* don't free twice */ 529 else 530 free(p_line[p_end]); 531 p_end--; 532 } 533 p_efake = -1; 534 535 p_max = hunkmax; /* gets reduced when --- found */ 536 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 537 line_beginning = ftello(pfp); 538 repl_beginning = 0; 539 fillcnt = 0; 540 fillsrc = 0; 541 filldst = 0; 542 ptrn_spaces_eaten = false; 543 repl_could_be_missing = true; 544 repl_missing = false; 545 repl_backtrack_position = 0; 546 repl_patch_line = 0; 547 ptrn_copiable = 0; 548 549 len = pgets(true); 550 p_input_line++; 551 if (len == 0 || strnNE(buf, "********", 8)) { 552 next_intuit_at(line_beginning, p_input_line); 553 return false; 554 } 555 p_context = 100; 556 p_hunk_beg = p_input_line + 1; 557 while (p_end < p_max) { 558 line_beginning = ftello(pfp); 559 len = pgets(true); 560 p_input_line++; 561 if (len == 0) { 562 if (p_max - p_end < 4) { 563 /* assume blank lines got chopped */ 564 strlcpy(buf, " \n", buf_size); 565 } else { 566 if (repl_beginning && repl_could_be_missing) { 567 repl_missing = true; 568 goto hunk_done; 569 } 570 fatal("unexpected end of file in patch\n"); 571 } 572 } 573 p_end++; 574 if (p_end >= hunkmax) 575 fatal("Internal error: hunk larger than hunk " 576 "buffer size"); 577 p_char[p_end] = *buf; 578 p_line[p_end] = NULL; 579 switch (*buf) { 580 case '*': 581 if (strnEQ(buf, "********", 8)) { 582 if (repl_beginning && repl_could_be_missing) { 583 repl_missing = true; 584 goto hunk_done; 585 } else 586 fatal("unexpected end of hunk " 587 "at line %ld\n", 588 p_input_line); 589 } 590 if (p_end != 0) { 591 if (repl_beginning && repl_could_be_missing) { 592 repl_missing = true; 593 goto hunk_done; 594 } 595 fatal("unexpected *** at line %ld: %s", 596 p_input_line, buf); 597 } 598 context = 0; 599 p_line[p_end] = savestr(buf); 600 if (out_of_mem) { 601 p_end--; 602 return false; 603 } 604 for (s = buf; 605 *s && !isdigit((unsigned char)*s); s++) 606 ; 607 if (!*s) 608 malformed(); 609 if (strnEQ(s, "0,0", 3)) 610 memmove(s, s + 2, strlen(s + 2) + 1); 611 p_first = strtolinenum(s, &s); 612 if (*s == ',') { 613 for (; 614 *s && !isdigit((unsigned char)*s); s++) 615 ; 616 if (!*s) 617 malformed(); 618 p_ptrn_lines = strtolinenum(s, &s) - p_first + 1; 619 if (p_ptrn_lines < 0) 620 malformed(); 621 } else if (p_first) 622 p_ptrn_lines = 1; 623 else { 624 p_ptrn_lines = 0; 625 p_first = 1; 626 } 627 if (p_first >= LINENUM_MAX - p_ptrn_lines || 628 p_ptrn_lines >= LINENUM_MAX - 6) 629 malformed(); 630 631 /* we need this much at least */ 632 p_max = p_ptrn_lines + 6; 633 while (p_max >= hunkmax) 634 grow_hunkmax(); 635 p_max = hunkmax; 636 break; 637 case '-': 638 if (buf[1] == '-') { 639 if (repl_beginning || 640 (p_end != p_ptrn_lines + 1 + 641 (p_char[p_end - 1] == '\n'))) { 642 if (p_end == 1) { 643 /* 644 * `old' lines were omitted; 645 * set up to fill them in 646 * from 'new' context lines. 647 */ 648 p_end = p_ptrn_lines + 1; 649 fillsrc = p_end + 1; 650 filldst = 1; 651 fillcnt = p_ptrn_lines; 652 } else { 653 if (repl_beginning) { 654 if (repl_could_be_missing) { 655 repl_missing = true; 656 goto hunk_done; 657 } 658 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 659 p_input_line, p_hunk_beg + repl_beginning); 660 } else { 661 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 662 (p_end <= p_ptrn_lines 663 ? "Premature" 664 : "Overdue"), 665 p_input_line, p_hunk_beg); 666 } 667 } 668 } 669 repl_beginning = p_end; 670 repl_backtrack_position = ftello(pfp); 671 repl_patch_line = p_input_line; 672 p_line[p_end] = savestr(buf); 673 if (out_of_mem) { 674 p_end--; 675 return false; 676 } 677 p_char[p_end] = '='; 678 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 679 ; 680 if (!*s) 681 malformed(); 682 p_newfirst = strtolinenum(s, &s); 683 if (*s == ',') { 684 for (; *s && !isdigit((unsigned char)*s); s++) 685 ; 686 if (!*s) 687 malformed(); 688 p_repl_lines = strtolinenum(s, &s) - 689 p_newfirst + 1; 690 if (p_repl_lines < 0) 691 malformed(); 692 } else if (p_newfirst) 693 p_repl_lines = 1; 694 else { 695 p_repl_lines = 0; 696 p_newfirst = 1; 697 } 698 if (p_newfirst >= LINENUM_MAX - p_repl_lines || 699 p_repl_lines >= LINENUM_MAX - p_end) 700 malformed(); 701 p_max = p_repl_lines + p_end; 702 if (p_max > MAXHUNKSIZE) 703 fatal("hunk too large (%ld lines) at line %ld: %s", 704 p_max, p_input_line, buf); 705 while (p_max >= hunkmax) 706 grow_hunkmax(); 707 if (p_repl_lines != ptrn_copiable && 708 (p_context != 0 || p_repl_lines != 1)) 709 repl_could_be_missing = false; 710 break; 711 } 712 goto change_line; 713 case '+': 714 case '!': 715 repl_could_be_missing = false; 716 change_line: 717 if (buf[1] == '\n' && canonicalize) 718 strlcpy(buf + 1, " \n", buf_size - 1); 719 if (!isspace((unsigned char)buf[1]) && 720 buf[1] != '>' && buf[1] != '<' && 721 repl_beginning && repl_could_be_missing) { 722 repl_missing = true; 723 goto hunk_done; 724 } 725 if (context >= 0) { 726 if (context < p_context) 727 p_context = context; 728 context = -1000; 729 } 730 p_line[p_end] = savestr(buf + 2); 731 if (out_of_mem) { 732 p_end--; 733 return false; 734 } 735 if (p_end == p_ptrn_lines) { 736 if (remove_special_line()) { 737 int l; 738 739 l = strlen(p_line[p_end]) - 1; 740 (p_line[p_end])[l] = 0; 741 } 742 } 743 break; 744 case '\t': 745 case '\n': /* assume the 2 spaces got eaten */ 746 if (repl_beginning && repl_could_be_missing && 747 (!ptrn_spaces_eaten || 748 diff_type == NEW_CONTEXT_DIFF)) { 749 repl_missing = true; 750 goto hunk_done; 751 } 752 p_line[p_end] = savestr(buf); 753 if (out_of_mem) { 754 p_end--; 755 return false; 756 } 757 if (p_end != p_ptrn_lines + 1) { 758 ptrn_spaces_eaten |= (repl_beginning != 0); 759 context++; 760 if (!repl_beginning) 761 ptrn_copiable++; 762 p_char[p_end] = ' '; 763 } 764 break; 765 case ' ': 766 if (!isspace((unsigned char)buf[1]) && 767 repl_beginning && repl_could_be_missing) { 768 repl_missing = true; 769 goto hunk_done; 770 } 771 context++; 772 if (!repl_beginning) 773 ptrn_copiable++; 774 p_line[p_end] = savestr(buf + 2); 775 if (out_of_mem) { 776 p_end--; 777 return false; 778 } 779 break; 780 default: 781 if (repl_beginning && repl_could_be_missing) { 782 repl_missing = true; 783 goto hunk_done; 784 } 785 malformed(); 786 } 787 /* set up p_len for strncmp() so we don't have to */ 788 /* assume null termination */ 789 if (p_line[p_end]) 790 p_len[p_end] = strlen(p_line[p_end]); 791 else 792 p_len[p_end] = 0; 793 } 794 795 hunk_done: 796 if (p_end >= 0 && !repl_beginning) 797 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 798 799 if (repl_missing) { 800 801 /* reset state back to just after --- */ 802 p_input_line = repl_patch_line; 803 for (p_end--; p_end > repl_beginning; p_end--) 804 free(p_line[p_end]); 805 fseeko(pfp, repl_backtrack_position, SEEK_SET); 806 807 /* redundant 'new' context lines were omitted - set */ 808 /* up to fill them in from the old file context */ 809 if (!p_context && p_repl_lines == 1) { 810 p_repl_lines = 0; 811 p_max--; 812 } 813 fillsrc = 1; 814 filldst = repl_beginning + 1; 815 fillcnt = p_repl_lines; 816 p_end = p_max; 817 } else if (!p_context && fillcnt == 1) { 818 /* the first hunk was a null hunk with no context */ 819 /* and we were expecting one line -- fix it up. */ 820 while (filldst < p_end) { 821 p_line[filldst] = p_line[filldst + 1]; 822 p_char[filldst] = p_char[filldst + 1]; 823 p_len[filldst] = p_len[filldst + 1]; 824 filldst++; 825 } 826 #if 0 827 repl_beginning--; /* this doesn't need to be fixed */ 828 #endif 829 p_end--; 830 p_first++; /* do append rather than insert */ 831 fillcnt = 0; 832 p_ptrn_lines = 0; 833 } 834 if (diff_type == CONTEXT_DIFF && 835 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 836 if (verbose) 837 say("%s\n%s\n%s\n", 838 "(Fascinating--this is really a new-style context diff but without", 839 "the telltale extra asterisks on the *** line that usually indicate", 840 "the new style...)"); 841 diff_type = NEW_CONTEXT_DIFF; 842 } 843 /* if there were omitted context lines, fill them in now */ 844 if (fillcnt) { 845 p_bfake = filldst; /* remember where not to free() */ 846 p_efake = filldst + fillcnt - 1; 847 while (fillcnt-- > 0) { 848 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 849 fillsrc++; 850 if (fillsrc > p_end) 851 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 852 p_hunk_beg); 853 p_line[filldst] = p_line[fillsrc]; 854 p_char[filldst] = p_char[fillsrc]; 855 p_len[filldst] = p_len[fillsrc]; 856 fillsrc++; 857 filldst++; 858 } 859 while (fillsrc <= p_end && fillsrc != repl_beginning && 860 p_char[fillsrc] != ' ') 861 fillsrc++; 862 #ifdef DEBUGGING 863 if (debug & 64) 864 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 865 fillsrc, filldst, repl_beginning, p_end + 1); 866 #endif 867 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 868 malformed(); 869 if (filldst != p_end + 1 && filldst != repl_beginning) 870 malformed(); 871 } 872 if (p_line[p_end] != NULL) { 873 if (remove_special_line()) { 874 p_len[p_end] -= 1; 875 (p_line[p_end])[p_len[p_end]] = 0; 876 } 877 } 878 } else if (diff_type == UNI_DIFF) { 879 LINENUM fillold; /* index of old lines */ 880 LINENUM fillnew; /* index of new lines */ 881 char ch; 882 883 line_beginning = ftello(pfp); /* file pos of the current line */ 884 len = pgets(true); 885 p_input_line++; 886 if (len == 0 || strnNE(buf, "@@ -", 4)) { 887 next_intuit_at(line_beginning, p_input_line); 888 return false; 889 } 890 s = buf + 4; 891 if (!*s) 892 malformed(); 893 p_first = strtolinenum(s, &s); 894 if (*s == ',') { 895 p_ptrn_lines = strtolinenum(s + 1, &s); 896 } else 897 p_ptrn_lines = 1; 898 if (*s == ' ') 899 s++; 900 if (*s != '+' || !*++s) 901 malformed(); 902 p_newfirst = strtolinenum(s, &s); 903 if (*s == ',') { 904 p_repl_lines = strtolinenum(s + 1, &s); 905 } else 906 p_repl_lines = 1; 907 if (*s == ' ') 908 s++; 909 if (*s != '@') 910 malformed(); 911 if (p_first >= LINENUM_MAX - p_ptrn_lines || 912 p_newfirst > LINENUM_MAX - p_repl_lines || 913 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 914 malformed(); 915 if (!p_ptrn_lines) 916 p_first++; /* do append rather than insert */ 917 p_max = p_ptrn_lines + p_repl_lines + 1; 918 while (p_max >= hunkmax) 919 grow_hunkmax(); 920 fillold = 1; 921 fillnew = fillold + p_ptrn_lines; 922 p_end = fillnew + p_repl_lines; 923 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 924 p_first + p_ptrn_lines - 1); 925 p_line[0] = savestr(buf); 926 if (out_of_mem) { 927 p_end = -1; 928 return false; 929 } 930 p_char[0] = '*'; 931 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 932 p_newfirst + p_repl_lines - 1); 933 p_line[fillnew] = savestr(buf); 934 if (out_of_mem) { 935 p_end = 0; 936 return false; 937 } 938 p_char[fillnew++] = '='; 939 p_context = 100; 940 context = 0; 941 p_hunk_beg = p_input_line + 1; 942 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 943 line_beginning = ftello(pfp); 944 len = pgets(true); 945 p_input_line++; 946 if (len == 0) { 947 if (p_max - fillnew < 3) { 948 /* assume blank lines got chopped */ 949 strlcpy(buf, " \n", buf_size); 950 } else { 951 fatal("unexpected end of file in patch\n"); 952 } 953 } 954 if (*buf == '\t' || *buf == '\n') { 955 ch = ' '; /* assume the space got eaten */ 956 s = savestr(buf); 957 } else { 958 ch = *buf; 959 s = savestr(buf + 1); 960 } 961 if (out_of_mem) { 962 while (--fillnew > p_ptrn_lines) 963 free(p_line[fillnew]); 964 p_end = fillold - 1; 965 return false; 966 } 967 switch (ch) { 968 case '-': 969 if (fillold > p_ptrn_lines) { 970 free(s); 971 p_end = fillnew - 1; 972 malformed(); 973 } 974 p_char[fillold] = ch; 975 p_line[fillold] = s; 976 p_len[fillold++] = strlen(s); 977 if (fillold > p_ptrn_lines) { 978 if (remove_special_line()) { 979 p_len[fillold - 1] -= 1; 980 s[p_len[fillold - 1]] = 0; 981 } 982 } 983 break; 984 case '=': 985 ch = ' '; 986 /* FALL THROUGH */ 987 case ' ': 988 if (fillold > p_ptrn_lines) { 989 free(s); 990 while (--fillnew > p_ptrn_lines) 991 free(p_line[fillnew]); 992 p_end = fillold - 1; 993 malformed(); 994 } 995 context++; 996 p_char[fillold] = ch; 997 p_line[fillold] = s; 998 p_len[fillold++] = strlen(s); 999 s = savestr(s); 1000 if (out_of_mem) { 1001 while (--fillnew > p_ptrn_lines) 1002 free(p_line[fillnew]); 1003 p_end = fillold - 1; 1004 return false; 1005 } 1006 if (fillold > p_ptrn_lines) { 1007 if (remove_special_line()) { 1008 p_len[fillold - 1] -= 1; 1009 s[p_len[fillold - 1]] = 0; 1010 } 1011 } 1012 /* FALL THROUGH */ 1013 case '+': 1014 if (fillnew > p_end) { 1015 free(s); 1016 while (--fillnew > p_ptrn_lines) 1017 free(p_line[fillnew]); 1018 p_end = fillold - 1; 1019 malformed(); 1020 } 1021 p_char[fillnew] = ch; 1022 p_line[fillnew] = s; 1023 p_len[fillnew++] = strlen(s); 1024 if (fillold > p_ptrn_lines) { 1025 if (remove_special_line()) { 1026 p_len[fillnew - 1] -= 1; 1027 s[p_len[fillnew - 1]] = 0; 1028 } 1029 } 1030 break; 1031 default: 1032 p_end = fillnew; 1033 malformed(); 1034 } 1035 if (ch != ' ' && context > 0) { 1036 if (context < p_context) 1037 p_context = context; 1038 context = -1000; 1039 } 1040 } /* while */ 1041 } else { /* normal diff--fake it up */ 1042 char hunk_type; 1043 int i; 1044 LINENUM min, max; 1045 1046 line_beginning = ftello(pfp); 1047 p_context = 0; 1048 len = pgets(true); 1049 p_input_line++; 1050 if (len == 0 || !isdigit((unsigned char)*buf)) { 1051 next_intuit_at(line_beginning, p_input_line); 1052 return false; 1053 } 1054 p_first = strtolinenum(buf, &s); 1055 if (*s == ',') { 1056 p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1; 1057 if (p_ptrn_lines < 0) 1058 malformed(); 1059 } else 1060 p_ptrn_lines = (*s != 'a'); 1061 hunk_type = *s; 1062 if (hunk_type == 'a') 1063 p_first++; /* do append rather than insert */ 1064 min = strtolinenum(s + 1, &s); 1065 if (*s == ',') 1066 max = strtolinenum(s + 1, &s); 1067 else 1068 max = min; 1069 if (min < 0 || min > max || max - min == LINENUM_MAX) 1070 malformed(); 1071 if (hunk_type == 'd') 1072 min++; 1073 p_newfirst = min; 1074 p_repl_lines = max - min + 1; 1075 if (p_newfirst > LINENUM_MAX - p_repl_lines || 1076 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1077 malformed(); 1078 p_end = p_ptrn_lines + p_repl_lines + 1; 1079 if (p_end > MAXHUNKSIZE) 1080 fatal("hunk too large (%ld lines) at line %ld: %s", 1081 p_end, p_input_line, buf); 1082 while (p_end >= hunkmax) 1083 grow_hunkmax(); 1084 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1085 p_first + p_ptrn_lines - 1); 1086 p_line[0] = savestr(buf); 1087 if (out_of_mem) { 1088 p_end = -1; 1089 return false; 1090 } 1091 p_char[0] = '*'; 1092 for (i = 1; i <= p_ptrn_lines; i++) { 1093 len = pgets(true); 1094 p_input_line++; 1095 if (len == 0) 1096 fatal("unexpected end of file in patch at line %ld\n", 1097 p_input_line); 1098 if (*buf != '<') 1099 fatal("< expected at line %ld of patch\n", 1100 p_input_line); 1101 p_line[i] = savestr(buf + 2); 1102 if (out_of_mem) { 1103 p_end = i - 1; 1104 return false; 1105 } 1106 p_len[i] = strlen(p_line[i]); 1107 p_char[i] = '-'; 1108 } 1109 1110 if (remove_special_line()) { 1111 p_len[i - 1] -= 1; 1112 (p_line[i - 1])[p_len[i - 1]] = 0; 1113 } 1114 if (hunk_type == 'c') { 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 } 1124 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1125 p_line[i] = savestr(buf); 1126 if (out_of_mem) { 1127 p_end = i - 1; 1128 return false; 1129 } 1130 p_char[i] = '='; 1131 for (i++; i <= p_end; i++) { 1132 len = pgets(true); 1133 p_input_line++; 1134 if (len == 0) 1135 fatal("unexpected end of file in patch at line %ld\n", 1136 p_input_line); 1137 if (*buf != '>') 1138 fatal("> expected at line %ld of patch\n", 1139 p_input_line); 1140 /* Don't overrun if we don't have enough line */ 1141 if (len > 2) 1142 p_line[i] = savestr(buf + 2); 1143 else 1144 p_line[i] = savestr(""); 1145 1146 if (out_of_mem) { 1147 p_end = i - 1; 1148 return false; 1149 } 1150 p_len[i] = strlen(p_line[i]); 1151 p_char[i] = '+'; 1152 } 1153 1154 if (remove_special_line()) { 1155 p_len[i - 1] -= 1; 1156 (p_line[i - 1])[p_len[i - 1]] = 0; 1157 } 1158 } 1159 if (reverse) /* backwards patch? */ 1160 if (!pch_swap()) 1161 say("Not enough memory to swap next hunk!\n"); 1162 #ifdef DEBUGGING 1163 if (debug & 2) { 1164 LINENUM i; 1165 char special; 1166 1167 for (i = 0; i <= p_end; i++) { 1168 if (i == p_ptrn_lines) 1169 special = '^'; 1170 else 1171 special = ' '; 1172 fprintf(stderr, "%3ld %c %c %s", i, p_char[i], 1173 special, p_line[i]); 1174 fflush(stderr); 1175 } 1176 } 1177 #endif 1178 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1179 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1180 return true; 1181 } 1182 1183 /* 1184 * Input a line from the patch file. 1185 * Worry about indentation if do_indent is true. 1186 * The line is read directly into the buf global variable which 1187 * is resized if necessary in order to hold the complete line. 1188 * Returns the number of characters read including the terminating 1189 * '\n', if any. 1190 */ 1191 size_t 1192 pgets(bool do_indent) 1193 { 1194 char *line; 1195 size_t len; 1196 int indent = 0, skipped = 0; 1197 1198 line = fgetln(pfp, &len); 1199 if (line != NULL) { 1200 if (len + 1 > buf_size) { 1201 while (len + 1 > buf_size) 1202 buf_size *= 2; 1203 free(buf); 1204 buf = malloc(buf_size); 1205 if (buf == NULL) 1206 fatal("out of memory\n"); 1207 } 1208 if (do_indent == 1 && p_indent) { 1209 for (; 1210 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1211 line++, skipped++) { 1212 if (*line == '\t') 1213 indent += 8 - (indent %7); 1214 else 1215 indent++; 1216 } 1217 } 1218 memcpy(buf, line, len - skipped); 1219 buf[len - skipped] = '\0'; 1220 } 1221 return len; 1222 } 1223 1224 1225 /* 1226 * Reverse the old and new portions of the current hunk. 1227 */ 1228 bool 1229 pch_swap(void) 1230 { 1231 char **tp_line; /* the text of the hunk */ 1232 unsigned short *tp_len;/* length of each line */ 1233 char *tp_char; /* +, -, and ! */ 1234 LINENUM i; 1235 LINENUM n; 1236 bool blankline = false; 1237 char *s; 1238 1239 i = p_first; 1240 p_first = p_newfirst; 1241 p_newfirst = i; 1242 1243 /* make a scratch copy */ 1244 1245 tp_line = p_line; 1246 tp_len = p_len; 1247 tp_char = p_char; 1248 p_line = NULL; /* force set_hunkmax to allocate again */ 1249 p_len = NULL; 1250 p_char = NULL; 1251 set_hunkmax(); 1252 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1253 1254 free(p_line); 1255 p_line = tp_line; 1256 free(p_len); 1257 p_len = tp_len; 1258 free(p_char); 1259 p_char = tp_char; 1260 return false; /* not enough memory to swap hunk! */ 1261 } 1262 /* now turn the new into the old */ 1263 1264 i = p_ptrn_lines + 1; 1265 if (tp_char[i] == '\n') { /* account for possible blank line */ 1266 blankline = true; 1267 i++; 1268 } 1269 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1270 if (p_efake <= i) 1271 n = p_end - i + 1; 1272 else 1273 n = -i; 1274 p_efake += n; 1275 p_bfake += n; 1276 } 1277 for (n = 0; i <= p_end; i++, n++) { 1278 p_line[n] = tp_line[i]; 1279 p_char[n] = tp_char[i]; 1280 if (p_char[n] == '+') 1281 p_char[n] = '-'; 1282 p_len[n] = tp_len[i]; 1283 } 1284 if (blankline) { 1285 i = p_ptrn_lines + 1; 1286 p_line[n] = tp_line[i]; 1287 p_char[n] = tp_char[i]; 1288 p_len[n] = tp_len[i]; 1289 n++; 1290 } 1291 if (p_char[0] != '=') 1292 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1293 p_input_line, p_char[0]); 1294 p_char[0] = '*'; 1295 for (s = p_line[0]; *s; s++) 1296 if (*s == '-') 1297 *s = '*'; 1298 1299 /* now turn the old into the new */ 1300 1301 if (p_char[0] != '*') 1302 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1303 p_input_line, p_char[0]); 1304 tp_char[0] = '='; 1305 for (s = tp_line[0]; *s; s++) 1306 if (*s == '*') 1307 *s = '-'; 1308 for (i = 0; n <= p_end; i++, n++) { 1309 p_line[n] = tp_line[i]; 1310 p_char[n] = tp_char[i]; 1311 if (p_char[n] == '-') 1312 p_char[n] = '+'; 1313 p_len[n] = tp_len[i]; 1314 } 1315 1316 if (i != p_ptrn_lines + 1) 1317 fatal("Malformed patch at line %ld: expected %ld lines, " 1318 "got %ld\n", 1319 p_input_line, p_ptrn_lines + 1, i); 1320 1321 i = p_ptrn_lines; 1322 p_ptrn_lines = p_repl_lines; 1323 p_repl_lines = i; 1324 1325 free(tp_line); 1326 free(tp_len); 1327 free(tp_char); 1328 1329 return true; 1330 } 1331 1332 /* 1333 * Return the specified line position in the old file of the old context. 1334 */ 1335 LINENUM 1336 pch_first(void) 1337 { 1338 return p_first; 1339 } 1340 1341 /* 1342 * Return the number of lines of old context. 1343 */ 1344 LINENUM 1345 pch_ptrn_lines(void) 1346 { 1347 return p_ptrn_lines; 1348 } 1349 1350 /* 1351 * Return the probable line position in the new file of the first line. 1352 */ 1353 LINENUM 1354 pch_newfirst(void) 1355 { 1356 return p_newfirst; 1357 } 1358 1359 /* 1360 * Return the number of lines in the replacement text including context. 1361 */ 1362 LINENUM 1363 pch_repl_lines(void) 1364 { 1365 return p_repl_lines; 1366 } 1367 1368 /* 1369 * Return the number of lines in the whole hunk. 1370 */ 1371 LINENUM 1372 pch_end(void) 1373 { 1374 return p_end; 1375 } 1376 1377 /* 1378 * Return the number of context lines before the first changed line. 1379 */ 1380 LINENUM 1381 pch_context(void) 1382 { 1383 return p_context; 1384 } 1385 1386 /* 1387 * Return the length of a particular patch line. 1388 */ 1389 unsigned short 1390 pch_line_len(LINENUM line) 1391 { 1392 return p_len[line]; 1393 } 1394 1395 /* 1396 * Return the control character (+, -, *, !, etc) for a patch line. 1397 */ 1398 char 1399 pch_char(LINENUM line) 1400 { 1401 return p_char[line]; 1402 } 1403 1404 /* 1405 * Return a pointer to a particular patch line. 1406 */ 1407 char * 1408 pfetch(LINENUM line) 1409 { 1410 return p_line[line]; 1411 } 1412 1413 /* 1414 * Return where in the patch file this hunk began, for error messages. 1415 */ 1416 LINENUM 1417 pch_hunk_beg(void) 1418 { 1419 return p_hunk_beg; 1420 } 1421 1422 /* 1423 * Apply an ed script by feeding ed itself. 1424 */ 1425 void 1426 do_ed_script(void) 1427 { 1428 char *t; 1429 off_t beginning_of_this_line; 1430 FILE *pipefp = NULL; 1431 int continuation; 1432 1433 if (!skip_rest_of_patch) { 1434 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1435 unlink(TMPOUTNAME); 1436 fatal("can't create temp file %s", TMPOUTNAME); 1437 } 1438 snprintf(buf, buf_size, "%s%s%s", _PATH_RED, 1439 verbose ? " " : " -s ", TMPOUTNAME); 1440 pipefp = popen(buf, "w"); 1441 } 1442 for (;;) { 1443 beginning_of_this_line = ftello(pfp); 1444 if (pgets(true) == 0) { 1445 next_intuit_at(beginning_of_this_line, p_input_line); 1446 break; 1447 } 1448 p_input_line++; 1449 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1450 ; 1451 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1452 if (isdigit((unsigned char)*buf) && 1453 (*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) { 1454 if (pipefp != NULL) 1455 fputs(buf, pipefp); 1456 if (*t == 's') { 1457 for (;;) { 1458 continuation = 0; 1459 t = strchr(buf, '\0') - 1; 1460 while (--t >= buf && *t == '\\') 1461 continuation = !continuation; 1462 if (!continuation || 1463 pgets(true) == 0) 1464 break; 1465 if (pipefp != NULL) 1466 fputs(buf, pipefp); 1467 } 1468 } else if (*t != 'd') { 1469 while (pgets(true)) { 1470 p_input_line++; 1471 if (pipefp != NULL) 1472 fputs(buf, pipefp); 1473 if (strEQ(buf, ".\n")) 1474 break; 1475 } 1476 } 1477 } else { 1478 next_intuit_at(beginning_of_this_line, p_input_line); 1479 break; 1480 } 1481 } 1482 if (pipefp == NULL) 1483 return; 1484 fprintf(pipefp, "w\n"); 1485 fprintf(pipefp, "q\n"); 1486 fflush(pipefp); 1487 pclose(pipefp); 1488 ignore_signals(); 1489 if (!check_only) { 1490 if (move_file(TMPOUTNAME, outname) < 0) { 1491 toutkeep = true; 1492 chmod(TMPOUTNAME, filemode); 1493 } else 1494 chmod(outname, filemode); 1495 } 1496 set_signals(1); 1497 } 1498 1499 /* 1500 * Choose the name of the file to be patched based on POSIX rules. 1501 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1502 * if the user specified --posix or set POSIXLY_CORRECT. 1503 */ 1504 static char * 1505 posix_name(const struct file_name *names, bool assume_exists) 1506 { 1507 char *path = NULL; 1508 int i; 1509 1510 /* 1511 * POSIX states that the filename will be chosen from one 1512 * of the old, new and index names (in that order) if 1513 * the file exists relative to CWD after -p stripping. 1514 */ 1515 for (i = 0; i < MAX_FILE; i++) { 1516 if (names[i].path != NULL && names[i].exists) { 1517 path = names[i].path; 1518 break; 1519 } 1520 } 1521 if (path == NULL && !assume_exists) { 1522 /* 1523 * No files found, check to see if the diff could be 1524 * creating a new file. 1525 */ 1526 if (path == NULL && ok_to_create_file && 1527 names[NEW_FILE].path != NULL) 1528 path = names[NEW_FILE].path; 1529 } 1530 1531 return path ? xstrdup(path) : NULL; 1532 } 1533 1534 static char * 1535 compare_names(const struct file_name *names, bool assume_exists) 1536 { 1537 size_t min_components, min_baselen, min_len, tmp; 1538 char *best = NULL; 1539 char *path; 1540 int i; 1541 1542 /* 1543 * The "best" name is the one with the fewest number of path 1544 * components, the shortest basename length, and the shortest 1545 * overall length (in that order). We only use the Index: file 1546 * if neither of the old or new files could be intuited from 1547 * the diff header. 1548 */ 1549 min_components = min_baselen = min_len = SIZE_MAX; 1550 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1551 path = names[i].path; 1552 if (path == NULL || (!names[i].exists && !assume_exists)) 1553 continue; 1554 if ((tmp = num_components(path)) > min_components) 1555 continue; 1556 if (tmp < min_components) { 1557 min_components = tmp; 1558 best = path; 1559 } 1560 if ((tmp = strlen(basename(path))) > min_baselen) 1561 continue; 1562 if (tmp < min_baselen) { 1563 min_baselen = tmp; 1564 best = path; 1565 } 1566 if ((tmp = strlen(path)) > min_len) 1567 continue; 1568 min_len = tmp; 1569 best = path; 1570 } 1571 return best; 1572 } 1573 1574 /* 1575 * Choose the name of the file to be patched based the "best" one 1576 * available. 1577 */ 1578 static char * 1579 best_name(const struct file_name *names, bool assume_exists) 1580 { 1581 char *best; 1582 1583 best = compare_names(names, assume_exists); 1584 1585 /* No match? Check to see if the diff could be creating a new file. */ 1586 if (best == NULL && ok_to_create_file) 1587 best = names[NEW_FILE].path; 1588 1589 return best ? xstrdup(best) : NULL; 1590 } 1591 1592 static size_t 1593 num_components(const char *path) 1594 { 1595 size_t n; 1596 const char *cp; 1597 1598 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1599 while (*cp == '/') 1600 cp++; /* skip consecutive slashes */ 1601 } 1602 return n; 1603 } 1604 1605 /* 1606 * Convert number at NPTR into LINENUM and save address of first 1607 * character that is not a digit in ENDPTR. If conversion is not 1608 * possible, call fatal. 1609 */ 1610 static LINENUM 1611 strtolinenum(char *nptr, char **endptr) 1612 { 1613 LINENUM rv; 1614 char c; 1615 char *p; 1616 const char *errstr; 1617 1618 for (p = nptr; isdigit((unsigned char)*p); p++) 1619 ; 1620 1621 if (p == nptr) 1622 malformed(); 1623 1624 c = *p; 1625 *p = '\0'; 1626 1627 rv = strtonum(nptr, 0, LINENUM_MAX, &errstr); 1628 if (errstr != NULL) 1629 fatal("invalid line number at line %ld: `%s' is %s\n", 1630 p_input_line, nptr, errstr); 1631 1632 *p = c; 1633 *endptr = p; 1634 1635 return rv; 1636 } 1637