pch.c revision 286348
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: stable/10/usr.bin/patch/pch.c 286348 2015-08-05 22:05:02Z delphij $ 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 <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 48static off_t p_filesize; /* size of the patch file */ 49static LINENUM p_first; /* 1st line number */ 50static LINENUM p_newfirst; /* 1st line number of replacement */ 51static LINENUM p_ptrn_lines; /* # lines in pattern */ 52static LINENUM p_repl_lines; /* # lines in replacement text */ 53static LINENUM p_end = -1; /* last line in hunk */ 54static LINENUM p_max; /* max allowed value of p_end */ 55static LINENUM p_context = 3; /* # of context lines */ 56static LINENUM p_input_line = 0; /* current line # from patch file */ 57static char **p_line = NULL;/* the text of the hunk */ 58static unsigned short *p_len = NULL; /* length of each line */ 59static char *p_char = NULL; /* +, -, and ! */ 60static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 61static int p_indent; /* indent to patch */ 62static off_t p_base; /* where to intuit this time */ 63static LINENUM p_bline; /* line # of p_base */ 64static off_t p_start; /* where intuit found a patch */ 65static LINENUM p_sline; /* and the line number for it */ 66static LINENUM p_hunk_beg; /* line number of current hunk */ 67static LINENUM p_efake = -1; /* end of faked up lines--don't free */ 68static LINENUM p_bfake = -1; /* beg of faked up lines */ 69static FILE *pfp = NULL; /* patch file pointer */ 70static char *bestguess = NULL; /* guess at correct filename */ 71 72static void grow_hunkmax(void); 73static int intuit_diff_type(void); 74static void next_intuit_at(off_t, LINENUM); 75static void skip_to(off_t, LINENUM); 76static size_t pgets(bool _do_indent); 77static char *best_name(const struct file_name *, bool); 78static char *posix_name(const struct file_name *, bool); 79static size_t num_components(const char *); 80static LINENUM strtolinenum(char *, char **); 81 82/* 83 * Prepare to look for the next patch in the patch file. 84 */ 85void 86re_patch(void) 87{ 88 p_first = 0; 89 p_newfirst = 0; 90 p_ptrn_lines = 0; 91 p_repl_lines = 0; 92 p_end = (LINENUM) - 1; 93 p_max = 0; 94 p_indent = 0; 95} 96 97/* 98 * Open the patch file at the beginning of time. 99 */ 100void 101open_patch_file(const char *filename) 102{ 103 struct stat filestat; 104 int nr, nw; 105 106 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 107 pfp = fopen(TMPPATNAME, "w"); 108 if (pfp == NULL) 109 pfatal("can't create %s", TMPPATNAME); 110 while ((nr = fread(buf, 1, buf_size, stdin)) > 0) { 111 nw = fwrite(buf, 1, nr, pfp); 112 if (nr != nw) 113 pfatal("write error to %s", TMPPATNAME); 114 } 115 if (ferror(pfp) || fclose(pfp)) 116 pfatal("can't write %s", TMPPATNAME); 117 filename = TMPPATNAME; 118 } 119 pfp = fopen(filename, "r"); 120 if (pfp == NULL) 121 pfatal("patch file %s not found", filename); 122 if (fstat(fileno(pfp), &filestat)) 123 pfatal("can't stat %s", filename); 124 p_filesize = filestat.st_size; 125 next_intuit_at(0, 1L); /* start at the beginning */ 126 set_hunkmax(); 127} 128 129/* 130 * Make sure our dynamically realloced tables are malloced to begin with. 131 */ 132void 133set_hunkmax(void) 134{ 135 if (p_line == NULL) 136 p_line = malloc(hunkmax * sizeof(char *)); 137 if (p_len == NULL) 138 p_len = malloc(hunkmax * sizeof(unsigned short)); 139 if (p_char == NULL) 140 p_char = malloc(hunkmax * sizeof(char)); 141} 142 143/* 144 * Enlarge the arrays containing the current hunk of patch. 145 */ 146static void 147grow_hunkmax(void) 148{ 149 int new_hunkmax = hunkmax * 2; 150 151 if (p_line == NULL || p_len == NULL || p_char == NULL) 152 fatal("Internal memory allocation error\n"); 153 154 p_line = reallocf(p_line, new_hunkmax * sizeof(char *)); 155 p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short)); 156 p_char = reallocf(p_char, new_hunkmax * sizeof(char)); 157 158 if (p_line != NULL && p_len != NULL && p_char != NULL) { 159 hunkmax = new_hunkmax; 160 return; 161 } 162 163 if (!using_plan_a) 164 fatal("out of memory\n"); 165 out_of_mem = true; /* whatever is null will be allocated again */ 166 /* from within plan_a(), of all places */ 167} 168 169/* True if the remainder of the patch file contains a diff of some sort. */ 170 171bool 172there_is_another_patch(void) 173{ 174 bool exists = false; 175 176 if (p_base != 0 && p_base >= p_filesize) { 177 if (verbose) 178 say("done\n"); 179 return false; 180 } 181 if (verbose) 182 say("Hmm..."); 183 diff_type = intuit_diff_type(); 184 if (!diff_type) { 185 if (p_base != 0) { 186 if (verbose) 187 say(" Ignoring the trailing garbage.\ndone\n"); 188 } else 189 say(" I can't seem to find a patch in there anywhere.\n"); 190 return false; 191 } 192 if (verbose) 193 say(" %sooks like %s to me...\n", 194 (p_base == 0 ? "L" : "The next patch l"), 195 diff_type == UNI_DIFF ? "a unified diff" : 196 diff_type == CONTEXT_DIFF ? "a context diff" : 197 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 198 diff_type == NORMAL_DIFF ? "a normal diff" : 199 "an ed script"); 200 if (p_indent && verbose) 201 say("(Patch is indented %d space%s.)\n", p_indent, 202 p_indent == 1 ? "" : "s"); 203 skip_to(p_start, p_sline); 204 while (filearg[0] == NULL) { 205 if (force || batch) { 206 say("No file to patch. Skipping...\n"); 207 filearg[0] = xstrdup(bestguess); 208 skip_rest_of_patch = true; 209 return true; 210 } 211 ask("File to patch: "); 212 if (*buf != '\n') { 213 free(bestguess); 214 bestguess = xstrdup(buf); 215 filearg[0] = fetchname(buf, &exists, 0); 216 } 217 if (!exists) { 218 ask("No file found--skip this patch? [n] "); 219 if (*buf != 'y') 220 continue; 221 if (verbose) 222 say("Skipping patch...\n"); 223 free(filearg[0]); 224 filearg[0] = fetchname(bestguess, &exists, 0); 225 skip_rest_of_patch = true; 226 return true; 227 } 228 } 229 return true; 230} 231 232static void 233p4_fetchname(struct file_name *name, char *str) 234{ 235 char *t, *h; 236 237 /* Skip leading whitespace. */ 238 while (isspace((unsigned char)*str)) 239 str++; 240 241 /* Remove the file revision number. */ 242 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 243 if (*t == '#') 244 h = t; 245 if (h != NULL) 246 *h = '\0'; 247 248 name->path = fetchname(str, &name->exists, strippath); 249} 250 251/* Determine what kind of diff is in the remaining part of the patch file. */ 252 253static int 254intuit_diff_type(void) 255{ 256 off_t this_line = 0, previous_line; 257 off_t first_command_line = -1; 258 LINENUM fcl_line = -1; 259 bool last_line_was_command = false, this_is_a_command = false; 260 bool stars_last_line = false, stars_this_line = false; 261 char *s, *t; 262 int indent, retval; 263 struct file_name names[MAX_FILE]; 264 265 memset(names, 0, sizeof(names)); 266 ok_to_create_file = false; 267 fseeko(pfp, p_base, SEEK_SET); 268 p_input_line = p_bline - 1; 269 for (;;) { 270 previous_line = this_line; 271 last_line_was_command = this_is_a_command; 272 stars_last_line = stars_this_line; 273 this_line = ftello(pfp); 274 indent = 0; 275 p_input_line++; 276 if (pgets(false) == 0) { 277 if (first_command_line >= 0) { 278 /* nothing but deletes!? */ 279 p_start = first_command_line; 280 p_sline = fcl_line; 281 retval = ED_DIFF; 282 goto scan_exit; 283 } else { 284 p_start = this_line; 285 p_sline = p_input_line; 286 retval = 0; 287 goto scan_exit; 288 } 289 } 290 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 291 if (*s == '\t') 292 indent += 8 - (indent % 8); 293 else 294 indent++; 295 } 296 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 297 ; 298 this_is_a_command = (isdigit((unsigned char)*s) && 299 (*t == 'd' || *t == 'c' || *t == 'a')); 300 if (first_command_line < 0 && this_is_a_command) { 301 first_command_line = this_line; 302 fcl_line = p_input_line; 303 p_indent = indent; /* assume this for now */ 304 } 305 if (!stars_last_line && strnEQ(s, "*** ", 4)) 306 names[OLD_FILE].path = fetchname(s + 4, 307 &names[OLD_FILE].exists, strippath); 308 else if (strnEQ(s, "--- ", 4)) 309 names[NEW_FILE].path = fetchname(s + 4, 310 &names[NEW_FILE].exists, strippath); 311 else if (strnEQ(s, "+++ ", 4)) 312 /* pretend it is the old name */ 313 names[OLD_FILE].path = fetchname(s + 4, 314 &names[OLD_FILE].exists, strippath); 315 else if (strnEQ(s, "Index:", 6)) 316 names[INDEX_FILE].path = fetchname(s + 6, 317 &names[INDEX_FILE].exists, strippath); 318 else if (strnEQ(s, "Prereq:", 7)) { 319 for (t = s + 7; isspace((unsigned char)*t); t++) 320 ; 321 revision = xstrdup(t); 322 for (t = revision; 323 *t && !isspace((unsigned char)*t); t++) 324 ; 325 *t = '\0'; 326 if (*revision == '\0') { 327 free(revision); 328 revision = NULL; 329 } 330 } else if (strnEQ(s, "==== ", 5)) { 331 /* Perforce-style diffs. */ 332 if ((t = strstr(s + 5, " - ")) != NULL) 333 p4_fetchname(&names[NEW_FILE], t + 3); 334 p4_fetchname(&names[OLD_FILE], s + 5); 335 } 336 if ((!diff_type || diff_type == ED_DIFF) && 337 first_command_line >= 0 && 338 strEQ(s, ".\n")) { 339 p_indent = indent; 340 p_start = first_command_line; 341 p_sline = fcl_line; 342 retval = ED_DIFF; 343 goto scan_exit; 344 } 345 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 346 if (strnEQ(s + 4, "0,0", 3)) 347 ok_to_create_file = true; 348 p_indent = indent; 349 p_start = this_line; 350 p_sline = p_input_line; 351 retval = UNI_DIFF; 352 goto scan_exit; 353 } 354 stars_this_line = strnEQ(s, "********", 8); 355 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 356 strnEQ(s, "*** ", 4)) { 357 if (strtolinenum(s + 4, &s) == 0) 358 ok_to_create_file = true; 359 /* 360 * If this is a new context diff the character just 361 * at the end of the line is a '*'. 362 */ 363 while (*s && *s != '\n') 364 s++; 365 p_indent = indent; 366 p_start = previous_line; 367 p_sline = p_input_line - 1; 368 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 369 goto scan_exit; 370 } 371 if ((!diff_type || diff_type == NORMAL_DIFF) && 372 last_line_was_command && 373 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 374 p_start = previous_line; 375 p_sline = p_input_line - 1; 376 p_indent = indent; 377 retval = NORMAL_DIFF; 378 goto scan_exit; 379 } 380 } 381scan_exit: 382 if (retval == UNI_DIFF) { 383 /* unswap old and new */ 384 struct file_name tmp = names[OLD_FILE]; 385 names[OLD_FILE] = names[NEW_FILE]; 386 names[NEW_FILE] = tmp; 387 } 388 if (filearg[0] == NULL) { 389 if (posix) 390 filearg[0] = posix_name(names, ok_to_create_file); 391 else { 392 /* Ignore the Index: name for context diffs, like GNU */ 393 if (names[OLD_FILE].path != NULL || 394 names[NEW_FILE].path != NULL) { 395 free(names[INDEX_FILE].path); 396 names[INDEX_FILE].path = NULL; 397 } 398 filearg[0] = best_name(names, ok_to_create_file); 399 } 400 } 401 402 free(bestguess); 403 bestguess = NULL; 404 if (filearg[0] != NULL) 405 bestguess = xstrdup(filearg[0]); 406 else if (!ok_to_create_file) { 407 /* 408 * We don't want to create a new file but we need a 409 * filename to set bestguess. Avoid setting filearg[0] 410 * so the file is not created automatically. 411 */ 412 if (posix) 413 bestguess = posix_name(names, true); 414 else 415 bestguess = best_name(names, true); 416 } 417 free(names[OLD_FILE].path); 418 free(names[NEW_FILE].path); 419 free(names[INDEX_FILE].path); 420 return retval; 421} 422 423/* 424 * Remember where this patch ends so we know where to start up again. 425 */ 426static void 427next_intuit_at(off_t file_pos, LINENUM file_line) 428{ 429 p_base = file_pos; 430 p_bline = file_line; 431} 432 433/* 434 * Basically a verbose fseeko() to the actual diff listing. 435 */ 436static void 437skip_to(off_t file_pos, LINENUM file_line) 438{ 439 size_t len; 440 441 if (p_base > file_pos) 442 fatal("Internal error: seek %lld>%lld\n", 443 (long long)p_base, (long long)file_pos); 444 if (verbose && p_base < file_pos) { 445 fseeko(pfp, p_base, SEEK_SET); 446 say("The text leading up to this was:\n--------------------------\n"); 447 while (ftello(pfp) < file_pos) { 448 len = pgets(false); 449 if (len == 0) 450 fatal("Unexpected end of file\n"); 451 say("|%s", buf); 452 } 453 say("--------------------------\n"); 454 } else 455 fseeko(pfp, file_pos, SEEK_SET); 456 p_input_line = file_line - 1; 457} 458 459/* Make this a function for better debugging. */ 460static void 461malformed(void) 462{ 463 fatal("malformed patch at line %ld: %s", p_input_line, buf); 464 /* about as informative as "Syntax error" in C */ 465} 466 467/* 468 * True if the line has been discarded (i.e. it is a line saying 469 * "\ No newline at end of file".) 470 */ 471static bool 472remove_special_line(void) 473{ 474 int c; 475 476 c = fgetc(pfp); 477 if (c == '\\') { 478 do { 479 c = fgetc(pfp); 480 } while (c != EOF && c != '\n'); 481 482 return true; 483 } 484 if (c != EOF) 485 fseeko(pfp, -1, SEEK_CUR); 486 487 return false; 488} 489 490/* 491 * True if there is more of the current diff listing to process. 492 */ 493bool 494another_hunk(void) 495{ 496 off_t line_beginning; /* file pos of the current line */ 497 LINENUM repl_beginning; /* index of --- line */ 498 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 499 LINENUM fillsrc; /* index of first line to copy */ 500 LINENUM filldst; /* index of first missing line */ 501 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 502 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 503 bool repl_missing; /* we are now backtracking */ 504 off_t repl_backtrack_position; /* file pos of first repl line */ 505 LINENUM repl_patch_line; /* input line number for same */ 506 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 507 char *s; 508 size_t len; 509 int context = 0; 510 511 while (p_end >= 0) { 512 if (p_end == p_efake) 513 p_end = p_bfake; /* don't free twice */ 514 else 515 free(p_line[p_end]); 516 p_end--; 517 } 518 p_efake = -1; 519 520 p_max = hunkmax; /* gets reduced when --- found */ 521 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 522 line_beginning = ftello(pfp); 523 repl_beginning = 0; 524 fillcnt = 0; 525 fillsrc = 0; 526 filldst = 0; 527 ptrn_spaces_eaten = false; 528 repl_could_be_missing = true; 529 repl_missing = false; 530 repl_backtrack_position = 0; 531 repl_patch_line = 0; 532 ptrn_copiable = 0; 533 534 len = pgets(true); 535 p_input_line++; 536 if (len == 0 || strnNE(buf, "********", 8)) { 537 next_intuit_at(line_beginning, p_input_line); 538 return false; 539 } 540 p_context = 100; 541 p_hunk_beg = p_input_line + 1; 542 while (p_end < p_max) { 543 line_beginning = ftello(pfp); 544 len = pgets(true); 545 p_input_line++; 546 if (len == 0) { 547 if (p_max - p_end < 4) { 548 /* assume blank lines got chopped */ 549 strlcpy(buf, " \n", buf_size); 550 } else { 551 if (repl_beginning && repl_could_be_missing) { 552 repl_missing = true; 553 goto hunk_done; 554 } 555 fatal("unexpected end of file in patch\n"); 556 } 557 } 558 p_end++; 559 if (p_end >= hunkmax) 560 fatal("Internal error: hunk larger than hunk " 561 "buffer size"); 562 p_char[p_end] = *buf; 563 p_line[p_end] = NULL; 564 switch (*buf) { 565 case '*': 566 if (strnEQ(buf, "********", 8)) { 567 if (repl_beginning && repl_could_be_missing) { 568 repl_missing = true; 569 goto hunk_done; 570 } else 571 fatal("unexpected end of hunk " 572 "at line %ld\n", 573 p_input_line); 574 } 575 if (p_end != 0) { 576 if (repl_beginning && repl_could_be_missing) { 577 repl_missing = true; 578 goto hunk_done; 579 } 580 fatal("unexpected *** at line %ld: %s", 581 p_input_line, buf); 582 } 583 context = 0; 584 p_line[p_end] = savestr(buf); 585 if (out_of_mem) { 586 p_end--; 587 return false; 588 } 589 for (s = buf; 590 *s && !isdigit((unsigned char)*s); s++) 591 ; 592 if (!*s) 593 malformed(); 594 if (strnEQ(s, "0,0", 3)) 595 memmove(s, s + 2, strlen(s + 2) + 1); 596 p_first = strtolinenum(s, &s); 597 if (*s == ',') { 598 for (; 599 *s && !isdigit((unsigned char)*s); s++) 600 ; 601 if (!*s) 602 malformed(); 603 p_ptrn_lines = strtolinenum(s, &s) - p_first + 1; 604 if (p_ptrn_lines < 0) 605 malformed(); 606 } else if (p_first) 607 p_ptrn_lines = 1; 608 else { 609 p_ptrn_lines = 0; 610 p_first = 1; 611 } 612 if (p_first >= LINENUM_MAX - p_ptrn_lines || 613 p_ptrn_lines >= LINENUM_MAX - 6) 614 malformed(); 615 616 /* we need this much at least */ 617 p_max = p_ptrn_lines + 6; 618 while (p_max >= hunkmax) 619 grow_hunkmax(); 620 p_max = hunkmax; 621 break; 622 case '-': 623 if (buf[1] == '-') { 624 if (repl_beginning || 625 (p_end != p_ptrn_lines + 1 + 626 (p_char[p_end - 1] == '\n'))) { 627 if (p_end == 1) { 628 /* 629 * `old' lines were omitted; 630 * set up to fill them in 631 * from 'new' context lines. 632 */ 633 p_end = p_ptrn_lines + 1; 634 fillsrc = p_end + 1; 635 filldst = 1; 636 fillcnt = p_ptrn_lines; 637 } else { 638 if (repl_beginning) { 639 if (repl_could_be_missing) { 640 repl_missing = true; 641 goto hunk_done; 642 } 643 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 644 p_input_line, p_hunk_beg + repl_beginning); 645 } else { 646 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 647 (p_end <= p_ptrn_lines 648 ? "Premature" 649 : "Overdue"), 650 p_input_line, p_hunk_beg); 651 } 652 } 653 } 654 repl_beginning = p_end; 655 repl_backtrack_position = ftello(pfp); 656 repl_patch_line = p_input_line; 657 p_line[p_end] = savestr(buf); 658 if (out_of_mem) { 659 p_end--; 660 return false; 661 } 662 p_char[p_end] = '='; 663 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 664 ; 665 if (!*s) 666 malformed(); 667 p_newfirst = strtolinenum(s, &s); 668 if (*s == ',') { 669 for (; *s && !isdigit((unsigned char)*s); s++) 670 ; 671 if (!*s) 672 malformed(); 673 p_repl_lines = strtolinenum(s, &s) - 674 p_newfirst + 1; 675 if (p_repl_lines < 0) 676 malformed(); 677 } else if (p_newfirst) 678 p_repl_lines = 1; 679 else { 680 p_repl_lines = 0; 681 p_newfirst = 1; 682 } 683 if (p_newfirst >= LINENUM_MAX - p_repl_lines || 684 p_repl_lines >= LINENUM_MAX - p_end) 685 malformed(); 686 p_max = p_repl_lines + p_end; 687 if (p_max > MAXHUNKSIZE) 688 fatal("hunk too large (%ld lines) at line %ld: %s", 689 p_max, p_input_line, buf); 690 while (p_max >= hunkmax) 691 grow_hunkmax(); 692 if (p_repl_lines != ptrn_copiable && 693 (p_context != 0 || p_repl_lines != 1)) 694 repl_could_be_missing = false; 695 break; 696 } 697 goto change_line; 698 case '+': 699 case '!': 700 repl_could_be_missing = false; 701 change_line: 702 if (buf[1] == '\n' && canonicalize) 703 strlcpy(buf + 1, " \n", buf_size - 1); 704 if (!isspace((unsigned char)buf[1]) && 705 buf[1] != '>' && buf[1] != '<' && 706 repl_beginning && repl_could_be_missing) { 707 repl_missing = true; 708 goto hunk_done; 709 } 710 if (context >= 0) { 711 if (context < p_context) 712 p_context = context; 713 context = -1000; 714 } 715 p_line[p_end] = savestr(buf + 2); 716 if (out_of_mem) { 717 p_end--; 718 return false; 719 } 720 if (p_end == p_ptrn_lines) { 721 if (remove_special_line()) { 722 int l; 723 724 l = strlen(p_line[p_end]) - 1; 725 (p_line[p_end])[l] = 0; 726 } 727 } 728 break; 729 case '\t': 730 case '\n': /* assume the 2 spaces got eaten */ 731 if (repl_beginning && repl_could_be_missing && 732 (!ptrn_spaces_eaten || 733 diff_type == NEW_CONTEXT_DIFF)) { 734 repl_missing = true; 735 goto hunk_done; 736 } 737 p_line[p_end] = savestr(buf); 738 if (out_of_mem) { 739 p_end--; 740 return false; 741 } 742 if (p_end != p_ptrn_lines + 1) { 743 ptrn_spaces_eaten |= (repl_beginning != 0); 744 context++; 745 if (!repl_beginning) 746 ptrn_copiable++; 747 p_char[p_end] = ' '; 748 } 749 break; 750 case ' ': 751 if (!isspace((unsigned char)buf[1]) && 752 repl_beginning && repl_could_be_missing) { 753 repl_missing = true; 754 goto hunk_done; 755 } 756 context++; 757 if (!repl_beginning) 758 ptrn_copiable++; 759 p_line[p_end] = savestr(buf + 2); 760 if (out_of_mem) { 761 p_end--; 762 return false; 763 } 764 break; 765 default: 766 if (repl_beginning && repl_could_be_missing) { 767 repl_missing = true; 768 goto hunk_done; 769 } 770 malformed(); 771 } 772 /* set up p_len for strncmp() so we don't have to */ 773 /* assume null termination */ 774 if (p_line[p_end]) 775 p_len[p_end] = strlen(p_line[p_end]); 776 else 777 p_len[p_end] = 0; 778 } 779 780hunk_done: 781 if (p_end >= 0 && !repl_beginning) 782 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 783 784 if (repl_missing) { 785 786 /* reset state back to just after --- */ 787 p_input_line = repl_patch_line; 788 for (p_end--; p_end > repl_beginning; p_end--) 789 free(p_line[p_end]); 790 fseeko(pfp, repl_backtrack_position, SEEK_SET); 791 792 /* redundant 'new' context lines were omitted - set */ 793 /* up to fill them in from the old file context */ 794 if (!p_context && p_repl_lines == 1) { 795 p_repl_lines = 0; 796 p_max--; 797 } 798 fillsrc = 1; 799 filldst = repl_beginning + 1; 800 fillcnt = p_repl_lines; 801 p_end = p_max; 802 } else if (!p_context && fillcnt == 1) { 803 /* the first hunk was a null hunk with no context */ 804 /* and we were expecting one line -- fix it up. */ 805 while (filldst < p_end) { 806 p_line[filldst] = p_line[filldst + 1]; 807 p_char[filldst] = p_char[filldst + 1]; 808 p_len[filldst] = p_len[filldst + 1]; 809 filldst++; 810 } 811#if 0 812 repl_beginning--; /* this doesn't need to be fixed */ 813#endif 814 p_end--; 815 p_first++; /* do append rather than insert */ 816 fillcnt = 0; 817 p_ptrn_lines = 0; 818 } 819 if (diff_type == CONTEXT_DIFF && 820 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 821 if (verbose) 822 say("%s\n%s\n%s\n", 823 "(Fascinating--this is really a new-style context diff but without", 824 "the telltale extra asterisks on the *** line that usually indicate", 825 "the new style...)"); 826 diff_type = NEW_CONTEXT_DIFF; 827 } 828 /* if there were omitted context lines, fill them in now */ 829 if (fillcnt) { 830 p_bfake = filldst; /* remember where not to free() */ 831 p_efake = filldst + fillcnt - 1; 832 while (fillcnt-- > 0) { 833 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 834 fillsrc++; 835 if (fillsrc > p_end) 836 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 837 p_hunk_beg); 838 p_line[filldst] = p_line[fillsrc]; 839 p_char[filldst] = p_char[fillsrc]; 840 p_len[filldst] = p_len[fillsrc]; 841 fillsrc++; 842 filldst++; 843 } 844 while (fillsrc <= p_end && fillsrc != repl_beginning && 845 p_char[fillsrc] != ' ') 846 fillsrc++; 847#ifdef DEBUGGING 848 if (debug & 64) 849 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 850 fillsrc, filldst, repl_beginning, p_end + 1); 851#endif 852 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 853 malformed(); 854 if (filldst != p_end + 1 && filldst != repl_beginning) 855 malformed(); 856 } 857 if (p_line[p_end] != NULL) { 858 if (remove_special_line()) { 859 p_len[p_end] -= 1; 860 (p_line[p_end])[p_len[p_end]] = 0; 861 } 862 } 863 } else if (diff_type == UNI_DIFF) { 864 LINENUM fillold; /* index of old lines */ 865 LINENUM fillnew; /* index of new lines */ 866 char ch; 867 868 line_beginning = ftello(pfp); /* file pos of the current line */ 869 len = pgets(true); 870 p_input_line++; 871 if (len == 0 || strnNE(buf, "@@ -", 4)) { 872 next_intuit_at(line_beginning, p_input_line); 873 return false; 874 } 875 s = buf + 4; 876 if (!*s) 877 malformed(); 878 p_first = strtolinenum(s, &s); 879 if (*s == ',') { 880 p_ptrn_lines = strtolinenum(s + 1, &s); 881 } else 882 p_ptrn_lines = 1; 883 if (*s == ' ') 884 s++; 885 if (*s != '+' || !*++s) 886 malformed(); 887 p_newfirst = strtolinenum(s, &s); 888 if (*s == ',') { 889 p_repl_lines = strtolinenum(s + 1, &s); 890 } else 891 p_repl_lines = 1; 892 if (*s == ' ') 893 s++; 894 if (*s != '@') 895 malformed(); 896 if (p_first >= LINENUM_MAX - p_ptrn_lines || 897 p_newfirst > LINENUM_MAX - p_repl_lines || 898 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 899 malformed(); 900 if (!p_ptrn_lines) 901 p_first++; /* do append rather than insert */ 902 p_max = p_ptrn_lines + p_repl_lines + 1; 903 while (p_max >= hunkmax) 904 grow_hunkmax(); 905 fillold = 1; 906 fillnew = fillold + p_ptrn_lines; 907 p_end = fillnew + p_repl_lines; 908 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 909 p_first + p_ptrn_lines - 1); 910 p_line[0] = savestr(buf); 911 if (out_of_mem) { 912 p_end = -1; 913 return false; 914 } 915 p_char[0] = '*'; 916 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 917 p_newfirst + p_repl_lines - 1); 918 p_line[fillnew] = savestr(buf); 919 if (out_of_mem) { 920 p_end = 0; 921 return false; 922 } 923 p_char[fillnew++] = '='; 924 p_context = 100; 925 context = 0; 926 p_hunk_beg = p_input_line + 1; 927 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 928 line_beginning = ftello(pfp); 929 len = pgets(true); 930 p_input_line++; 931 if (len == 0) { 932 if (p_max - fillnew < 3) { 933 /* assume blank lines got chopped */ 934 strlcpy(buf, " \n", buf_size); 935 } else { 936 fatal("unexpected end of file in patch\n"); 937 } 938 } 939 if (*buf == '\t' || *buf == '\n') { 940 ch = ' '; /* assume the space got eaten */ 941 s = savestr(buf); 942 } else { 943 ch = *buf; 944 s = savestr(buf + 1); 945 } 946 if (out_of_mem) { 947 while (--fillnew > p_ptrn_lines) 948 free(p_line[fillnew]); 949 p_end = fillold - 1; 950 return false; 951 } 952 switch (ch) { 953 case '-': 954 if (fillold > p_ptrn_lines) { 955 free(s); 956 p_end = fillnew - 1; 957 malformed(); 958 } 959 p_char[fillold] = ch; 960 p_line[fillold] = s; 961 p_len[fillold++] = strlen(s); 962 if (fillold > p_ptrn_lines) { 963 if (remove_special_line()) { 964 p_len[fillold - 1] -= 1; 965 s[p_len[fillold - 1]] = 0; 966 } 967 } 968 break; 969 case '=': 970 ch = ' '; 971 /* FALL THROUGH */ 972 case ' ': 973 if (fillold > p_ptrn_lines) { 974 free(s); 975 while (--fillnew > p_ptrn_lines) 976 free(p_line[fillnew]); 977 p_end = fillold - 1; 978 malformed(); 979 } 980 context++; 981 p_char[fillold] = ch; 982 p_line[fillold] = s; 983 p_len[fillold++] = strlen(s); 984 s = savestr(s); 985 if (out_of_mem) { 986 while (--fillnew > p_ptrn_lines) 987 free(p_line[fillnew]); 988 p_end = fillold - 1; 989 return false; 990 } 991 if (fillold > p_ptrn_lines) { 992 if (remove_special_line()) { 993 p_len[fillold - 1] -= 1; 994 s[p_len[fillold - 1]] = 0; 995 } 996 } 997 /* FALL THROUGH */ 998 case '+': 999 if (fillnew > p_end) { 1000 free(s); 1001 while (--fillnew > p_ptrn_lines) 1002 free(p_line[fillnew]); 1003 p_end = fillold - 1; 1004 malformed(); 1005 } 1006 p_char[fillnew] = ch; 1007 p_line[fillnew] = s; 1008 p_len[fillnew++] = strlen(s); 1009 if (fillold > p_ptrn_lines) { 1010 if (remove_special_line()) { 1011 p_len[fillnew - 1] -= 1; 1012 s[p_len[fillnew - 1]] = 0; 1013 } 1014 } 1015 break; 1016 default: 1017 p_end = fillnew; 1018 malformed(); 1019 } 1020 if (ch != ' ' && context > 0) { 1021 if (context < p_context) 1022 p_context = context; 1023 context = -1000; 1024 } 1025 } /* while */ 1026 } else { /* normal diff--fake it up */ 1027 char hunk_type; 1028 int i; 1029 LINENUM min, max; 1030 1031 line_beginning = ftello(pfp); 1032 p_context = 0; 1033 len = pgets(true); 1034 p_input_line++; 1035 if (len == 0 || !isdigit((unsigned char)*buf)) { 1036 next_intuit_at(line_beginning, p_input_line); 1037 return false; 1038 } 1039 p_first = strtolinenum(buf, &s); 1040 if (*s == ',') { 1041 p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1; 1042 if (p_ptrn_lines < 0) 1043 malformed(); 1044 } else 1045 p_ptrn_lines = (*s != 'a'); 1046 hunk_type = *s; 1047 if (hunk_type == 'a') 1048 p_first++; /* do append rather than insert */ 1049 min = strtolinenum(s + 1, &s); 1050 if (*s == ',') 1051 max = strtolinenum(s + 1, &s); 1052 else 1053 max = min; 1054 if (min < 0 || min > max || max - min == LINENUM_MAX) 1055 malformed(); 1056 if (hunk_type == 'd') 1057 min++; 1058 p_newfirst = min; 1059 p_repl_lines = max - min + 1; 1060 if (p_newfirst > LINENUM_MAX - p_repl_lines || 1061 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1062 malformed(); 1063 p_end = p_ptrn_lines + p_repl_lines + 1; 1064 if (p_end > MAXHUNKSIZE) 1065 fatal("hunk too large (%ld lines) at line %ld: %s", 1066 p_end, p_input_line, buf); 1067 while (p_end >= hunkmax) 1068 grow_hunkmax(); 1069 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1070 p_first + p_ptrn_lines - 1); 1071 p_line[0] = savestr(buf); 1072 if (out_of_mem) { 1073 p_end = -1; 1074 return false; 1075 } 1076 p_char[0] = '*'; 1077 for (i = 1; i <= p_ptrn_lines; i++) { 1078 len = pgets(true); 1079 p_input_line++; 1080 if (len == 0) 1081 fatal("unexpected end of file in patch at line %ld\n", 1082 p_input_line); 1083 if (*buf != '<') 1084 fatal("< expected at line %ld of patch\n", 1085 p_input_line); 1086 p_line[i] = savestr(buf + 2); 1087 if (out_of_mem) { 1088 p_end = i - 1; 1089 return false; 1090 } 1091 p_len[i] = strlen(p_line[i]); 1092 p_char[i] = '-'; 1093 } 1094 1095 if (remove_special_line()) { 1096 p_len[i - 1] -= 1; 1097 (p_line[i - 1])[p_len[i - 1]] = 0; 1098 } 1099 if (hunk_type == 'c') { 1100 len = pgets(true); 1101 p_input_line++; 1102 if (len == 0) 1103 fatal("unexpected end of file in patch at line %ld\n", 1104 p_input_line); 1105 if (*buf != '-') 1106 fatal("--- expected at line %ld of patch\n", 1107 p_input_line); 1108 } 1109 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1110 p_line[i] = savestr(buf); 1111 if (out_of_mem) { 1112 p_end = i - 1; 1113 return false; 1114 } 1115 p_char[i] = '='; 1116 for (i++; i <= p_end; i++) { 1117 len = pgets(true); 1118 p_input_line++; 1119 if (len == 0) 1120 fatal("unexpected end of file in patch at line %ld\n", 1121 p_input_line); 1122 if (*buf != '>') 1123 fatal("> expected at line %ld of patch\n", 1124 p_input_line); 1125 p_line[i] = savestr(buf + 2); 1126 if (out_of_mem) { 1127 p_end = i - 1; 1128 return false; 1129 } 1130 p_len[i] = strlen(p_line[i]); 1131 p_char[i] = '+'; 1132 } 1133 1134 if (remove_special_line()) { 1135 p_len[i - 1] -= 1; 1136 (p_line[i - 1])[p_len[i - 1]] = 0; 1137 } 1138 } 1139 if (reverse) /* backwards patch? */ 1140 if (!pch_swap()) 1141 say("Not enough memory to swap next hunk!\n"); 1142#ifdef DEBUGGING 1143 if (debug & 2) { 1144 int i; 1145 char special; 1146 1147 for (i = 0; i <= p_end; i++) { 1148 if (i == p_ptrn_lines) 1149 special = '^'; 1150 else 1151 special = ' '; 1152 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1153 special, p_line[i]); 1154 fflush(stderr); 1155 } 1156 } 1157#endif 1158 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1159 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1160 return true; 1161} 1162 1163/* 1164 * Input a line from the patch file. 1165 * Worry about indentation if do_indent is true. 1166 * The line is read directly into the buf global variable which 1167 * is resized if necessary in order to hold the complete line. 1168 * Returns the number of characters read including the terminating 1169 * '\n', if any. 1170 */ 1171size_t 1172pgets(bool do_indent) 1173{ 1174 char *line; 1175 size_t len; 1176 int indent = 0, skipped = 0; 1177 1178 line = fgetln(pfp, &len); 1179 if (line != NULL) { 1180 if (len + 1 > buf_size) { 1181 while (len + 1 > buf_size) 1182 buf_size *= 2; 1183 free(buf); 1184 buf = malloc(buf_size); 1185 if (buf == NULL) 1186 fatal("out of memory\n"); 1187 } 1188 if (do_indent == 1 && p_indent) { 1189 for (; 1190 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1191 line++, skipped++) { 1192 if (*line == '\t') 1193 indent += 8 - (indent %7); 1194 else 1195 indent++; 1196 } 1197 } 1198 memcpy(buf, line, len - skipped); 1199 buf[len - skipped] = '\0'; 1200 } 1201 return len; 1202} 1203 1204 1205/* 1206 * Reverse the old and new portions of the current hunk. 1207 */ 1208bool 1209pch_swap(void) 1210{ 1211 char **tp_line; /* the text of the hunk */ 1212 unsigned short *tp_len;/* length of each line */ 1213 char *tp_char; /* +, -, and ! */ 1214 LINENUM i; 1215 LINENUM n; 1216 bool blankline = false; 1217 char *s; 1218 1219 i = p_first; 1220 p_first = p_newfirst; 1221 p_newfirst = i; 1222 1223 /* make a scratch copy */ 1224 1225 tp_line = p_line; 1226 tp_len = p_len; 1227 tp_char = p_char; 1228 p_line = NULL; /* force set_hunkmax to allocate again */ 1229 p_len = NULL; 1230 p_char = NULL; 1231 set_hunkmax(); 1232 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1233 1234 free(p_line); 1235 p_line = tp_line; 1236 free(p_len); 1237 p_len = tp_len; 1238 free(p_char); 1239 p_char = tp_char; 1240 return false; /* not enough memory to swap hunk! */ 1241 } 1242 /* now turn the new into the old */ 1243 1244 i = p_ptrn_lines + 1; 1245 if (tp_char[i] == '\n') { /* account for possible blank line */ 1246 blankline = true; 1247 i++; 1248 } 1249 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1250 if (p_efake <= i) 1251 n = p_end - i + 1; 1252 else 1253 n = -i; 1254 p_efake += n; 1255 p_bfake += n; 1256 } 1257 for (n = 0; i <= p_end; i++, n++) { 1258 p_line[n] = tp_line[i]; 1259 p_char[n] = tp_char[i]; 1260 if (p_char[n] == '+') 1261 p_char[n] = '-'; 1262 p_len[n] = tp_len[i]; 1263 } 1264 if (blankline) { 1265 i = p_ptrn_lines + 1; 1266 p_line[n] = tp_line[i]; 1267 p_char[n] = tp_char[i]; 1268 p_len[n] = tp_len[i]; 1269 n++; 1270 } 1271 if (p_char[0] != '=') 1272 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1273 p_input_line, p_char[0]); 1274 p_char[0] = '*'; 1275 for (s = p_line[0]; *s; s++) 1276 if (*s == '-') 1277 *s = '*'; 1278 1279 /* now turn the old into the new */ 1280 1281 if (p_char[0] != '*') 1282 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1283 p_input_line, p_char[0]); 1284 tp_char[0] = '='; 1285 for (s = tp_line[0]; *s; s++) 1286 if (*s == '*') 1287 *s = '-'; 1288 for (i = 0; n <= p_end; i++, n++) { 1289 p_line[n] = tp_line[i]; 1290 p_char[n] = tp_char[i]; 1291 if (p_char[n] == '-') 1292 p_char[n] = '+'; 1293 p_len[n] = tp_len[i]; 1294 } 1295 1296 if (i != p_ptrn_lines + 1) 1297 fatal("Malformed patch at line %ld: expected %ld lines, " 1298 "got %ld\n", 1299 p_input_line, p_ptrn_lines + 1, i); 1300 1301 i = p_ptrn_lines; 1302 p_ptrn_lines = p_repl_lines; 1303 p_repl_lines = i; 1304 1305 free(tp_line); 1306 free(tp_len); 1307 free(tp_char); 1308 1309 return true; 1310} 1311 1312/* 1313 * Return the specified line position in the old file of the old context. 1314 */ 1315LINENUM 1316pch_first(void) 1317{ 1318 return p_first; 1319} 1320 1321/* 1322 * Return the number of lines of old context. 1323 */ 1324LINENUM 1325pch_ptrn_lines(void) 1326{ 1327 return p_ptrn_lines; 1328} 1329 1330/* 1331 * Return the probable line position in the new file of the first line. 1332 */ 1333LINENUM 1334pch_newfirst(void) 1335{ 1336 return p_newfirst; 1337} 1338 1339/* 1340 * Return the number of lines in the replacement text including context. 1341 */ 1342LINENUM 1343pch_repl_lines(void) 1344{ 1345 return p_repl_lines; 1346} 1347 1348/* 1349 * Return the number of lines in the whole hunk. 1350 */ 1351LINENUM 1352pch_end(void) 1353{ 1354 return p_end; 1355} 1356 1357/* 1358 * Return the number of context lines before the first changed line. 1359 */ 1360LINENUM 1361pch_context(void) 1362{ 1363 return p_context; 1364} 1365 1366/* 1367 * Return the length of a particular patch line. 1368 */ 1369unsigned short 1370pch_line_len(LINENUM line) 1371{ 1372 return p_len[line]; 1373} 1374 1375/* 1376 * Return the control character (+, -, *, !, etc) for a patch line. 1377 */ 1378char 1379pch_char(LINENUM line) 1380{ 1381 return p_char[line]; 1382} 1383 1384/* 1385 * Return a pointer to a particular patch line. 1386 */ 1387char * 1388pfetch(LINENUM line) 1389{ 1390 return p_line[line]; 1391} 1392 1393/* 1394 * Return where in the patch file this hunk began, for error messages. 1395 */ 1396LINENUM 1397pch_hunk_beg(void) 1398{ 1399 return p_hunk_beg; 1400} 1401 1402/* 1403 * Apply an ed script by feeding ed itself. 1404 */ 1405void 1406do_ed_script(void) 1407{ 1408 char *t; 1409 off_t beginning_of_this_line; 1410 FILE *pipefp = NULL; 1411 int continuation; 1412 1413 if (!skip_rest_of_patch) { 1414 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1415 unlink(TMPOUTNAME); 1416 fatal("can't create temp file %s", TMPOUTNAME); 1417 } 1418 snprintf(buf, buf_size, "%s%s%s", _PATH_RED, 1419 verbose ? " " : " -s ", TMPOUTNAME); 1420 pipefp = popen(buf, "w"); 1421 } 1422 for (;;) { 1423 beginning_of_this_line = ftello(pfp); 1424 if (pgets(true) == 0) { 1425 next_intuit_at(beginning_of_this_line, p_input_line); 1426 break; 1427 } 1428 p_input_line++; 1429 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1430 ; 1431 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1432 if (isdigit((unsigned char)*buf) && 1433 (*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) { 1434 if (pipefp != NULL) 1435 fputs(buf, pipefp); 1436 if (*t == 's') { 1437 for (;;) { 1438 continuation = 0; 1439 t = strchr(buf, '\0') - 1; 1440 while (--t >= buf && *t == '\\') 1441 continuation = !continuation; 1442 if (!continuation || 1443 pgets(true) == 0) 1444 break; 1445 if (pipefp != NULL) 1446 fputs(buf, pipefp); 1447 } 1448 } else if (*t != 'd') { 1449 while (pgets(true)) { 1450 p_input_line++; 1451 if (pipefp != NULL) 1452 fputs(buf, pipefp); 1453 if (strEQ(buf, ".\n")) 1454 break; 1455 } 1456 } 1457 } else { 1458 next_intuit_at(beginning_of_this_line, p_input_line); 1459 break; 1460 } 1461 } 1462 if (pipefp == NULL) 1463 return; 1464 fprintf(pipefp, "w\n"); 1465 fprintf(pipefp, "q\n"); 1466 fflush(pipefp); 1467 pclose(pipefp); 1468 ignore_signals(); 1469 if (!check_only) { 1470 if (move_file(TMPOUTNAME, outname) < 0) { 1471 toutkeep = true; 1472 chmod(TMPOUTNAME, filemode); 1473 } else 1474 chmod(outname, filemode); 1475 } 1476 set_signals(1); 1477} 1478 1479/* 1480 * Choose the name of the file to be patched based on POSIX rules. 1481 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1482 * if the user specified --posix or set POSIXLY_CORRECT. 1483 */ 1484static char * 1485posix_name(const struct file_name *names, bool assume_exists) 1486{ 1487 char *path = NULL; 1488 int i; 1489 1490 /* 1491 * POSIX states that the filename will be chosen from one 1492 * of the old, new and index names (in that order) if 1493 * the file exists relative to CWD after -p stripping. 1494 */ 1495 for (i = 0; i < MAX_FILE; i++) { 1496 if (names[i].path != NULL && names[i].exists) { 1497 path = names[i].path; 1498 break; 1499 } 1500 } 1501 if (path == NULL && !assume_exists) { 1502 /* 1503 * No files found, look for something we can checkout from 1504 * RCS/SCCS dirs. Same order as above. 1505 */ 1506 for (i = 0; i < MAX_FILE; i++) { 1507 if (names[i].path != NULL && 1508 (path = checked_in(names[i].path)) != NULL) 1509 break; 1510 } 1511 /* 1512 * Still no match? Check to see if the diff could be creating 1513 * a new file. 1514 */ 1515 if (path == NULL && ok_to_create_file && 1516 names[NEW_FILE].path != NULL) 1517 path = names[NEW_FILE].path; 1518 } 1519 1520 return path ? xstrdup(path) : NULL; 1521} 1522 1523static char * 1524compare_names(const struct file_name *names, bool assume_exists, int phase) 1525{ 1526 size_t min_components, min_baselen, min_len, tmp; 1527 char *best = NULL; 1528 char *path; 1529 int i; 1530 1531 /* 1532 * The "best" name is the one with the fewest number of path 1533 * components, the shortest basename length, and the shortest 1534 * overall length (in that order). We only use the Index: file 1535 * if neither of the old or new files could be intuited from 1536 * the diff header. 1537 */ 1538 min_components = min_baselen = min_len = SIZE_MAX; 1539 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1540 path = names[i].path; 1541 if (path == NULL || 1542 (phase == 1 && !names[i].exists && !assume_exists) || 1543 (phase == 2 && checked_in(path) == NULL)) 1544 continue; 1545 if ((tmp = num_components(path)) > min_components) 1546 continue; 1547 if (tmp < min_components) { 1548 min_components = tmp; 1549 best = path; 1550 } 1551 if ((tmp = strlen(basename(path))) > min_baselen) 1552 continue; 1553 if (tmp < min_baselen) { 1554 min_baselen = tmp; 1555 best = path; 1556 } 1557 if ((tmp = strlen(path)) > min_len) 1558 continue; 1559 min_len = tmp; 1560 best = path; 1561 } 1562 return best; 1563} 1564 1565/* 1566 * Choose the name of the file to be patched based the "best" one 1567 * available. 1568 */ 1569static char * 1570best_name(const struct file_name *names, bool assume_exists) 1571{ 1572 char *best; 1573 1574 best = compare_names(names, assume_exists, 1); 1575 if (best == NULL) { 1576 best = compare_names(names, assume_exists, 2); 1577 /* 1578 * Still no match? Check to see if the diff could be creating 1579 * a new file. 1580 */ 1581 if (best == NULL && ok_to_create_file && 1582 names[NEW_FILE].path != NULL) 1583 best = names[NEW_FILE].path; 1584 } 1585 1586 return best ? xstrdup(best) : NULL; 1587} 1588 1589static size_t 1590num_components(const char *path) 1591{ 1592 size_t n; 1593 const char *cp; 1594 1595 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1596 while (*cp == '/') 1597 cp++; /* skip consecutive slashes */ 1598 } 1599 return n; 1600} 1601 1602/* 1603 * Convert number at NPTR into LINENUM and save address of first 1604 * character that is not a digit in ENDPTR. If conversion is not 1605 * possible, call fatal. 1606 */ 1607static LINENUM 1608strtolinenum(char *nptr, char **endptr) 1609{ 1610 LINENUM rv; 1611 char c; 1612 char *p; 1613 const char *errstr; 1614 1615 for (p = nptr; isdigit((unsigned char)*p); p++) 1616 ; 1617 1618 if (p == nptr) 1619 malformed(); 1620 1621 c = *p; 1622 *p = '\0'; 1623 1624 rv = strtonum(nptr, 0, LINENUM_MAX, &errstr); 1625 if (errstr != NULL) 1626 fatal("invalid line number at line %ld: `%s' is %s\n", 1627 p_input_line, nptr, errstr); 1628 1629 *p = c; 1630 *endptr = p; 1631 1632 return rv; 1633} 1634