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