1 /* 2 * $OpenBSD: pch.c,v 1.37 2007/09/02 15:19:33 deraadt Exp $ 3 * $DragonFly: src/usr.bin/patch/pch.c,v 1.6 2008/08/10 23:35:40 joerg Exp $ 4 * $NetBSD: pch.c,v 1.31 2020/11/17 20:49:12 rhialto Exp $ 5 */ 6 7 /* 8 * patch - a program to apply diffs to original files 9 * 10 * Copyright 1986, Larry Wall 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following condition is met: 14 * 1. Redistributions of source code must retain the above copyright notice, 15 * this condition and the following disclaimer. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 30 * behaviour 31 */ 32 33 #include <sys/cdefs.h> 34 __RCSID("$NetBSD: pch.c,v 1.31 2020/11/17 20:49:12 rhialto Exp $"); 35 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 39 #include <ctype.h> 40 #include <libgen.h> 41 #include <limits.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #include "common.h" 48 #include "util.h" 49 #include "pch.h" 50 #include "pathnames.h" 51 52 /* Patch (diff listing) abstract type. */ 53 54 static long p_filesize; /* size of the patch file */ 55 static LINENUM p_first; /* 1st line number */ 56 static LINENUM p_newfirst; /* 1st line number of replacement */ 57 static LINENUM p_ptrn_lines; /* # lines in pattern */ 58 static LINENUM p_repl_lines; /* # lines in replacement text */ 59 static LINENUM p_end = -1; /* last line in hunk */ 60 static LINENUM p_max; /* max allowed value of p_end */ 61 static LINENUM p_context = 3; /* # of context lines */ 62 static LINENUM p_input_line = 0; /* current line # from patch file */ 63 static char **p_line = NULL;/* the text of the hunk */ 64 static short *p_len = NULL; /* length of each line */ 65 static char *p_char = NULL; /* +, -, and ! */ 66 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 67 static int p_indent; /* indent to patch */ 68 static LINENUM p_base; /* where to intuit this time */ 69 static LINENUM p_bline; /* line # of p_base */ 70 static LINENUM p_start; /* where intuit found a patch */ 71 static LINENUM p_sline; /* and the line number for it */ 72 static LINENUM p_hunk_beg; /* line number of current hunk */ 73 static LINENUM p_efake = -1; /* end of faked up lines--don't free */ 74 static LINENUM p_bfake = -1; /* beg of faked up lines */ 75 static FILE *pfp = NULL; /* patch file pointer */ 76 static char *bestguess = NULL; /* guess at correct filename */ 77 78 static void grow_hunkmax(void); 79 static int intuit_diff_type(void); 80 static void next_intuit_at(LINENUM, LINENUM); 81 static void skip_to(LINENUM, LINENUM); 82 static char *pgets(char *, int, FILE *); 83 static char *best_name(const struct file_name *, bool); 84 static char *posix_name(const struct file_name *, bool); 85 static size_t num_components(const char *); 86 87 /* 88 * Prepare to look for the next patch in the patch file. 89 */ 90 void 91 re_patch(void) 92 { 93 p_first = 0; 94 p_newfirst = 0; 95 p_ptrn_lines = 0; 96 p_repl_lines = 0; 97 p_end = (LINENUM) - 1; 98 p_max = 0; 99 p_indent = 0; 100 } 101 102 /* 103 * Open the patch file at the beginning of time. 104 */ 105 void 106 open_patch_file(const char *filename) 107 { 108 struct stat filestat; 109 110 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 111 pfp = fopen(TMPPATNAME, "w"); 112 if (pfp == NULL) 113 pfatal("can't create %s", TMPPATNAME); 114 while (fgets(buf, buf_len, stdin) != NULL) 115 fputs(buf, pfp); 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 fstat(fileno(pfp), &filestat); 124 p_filesize = filestat.st_size; 125 next_intuit_at(0L, 1L); /* start at the beginning */ 126 set_hunkmax(); 127 } 128 129 /* 130 * Make sure our dynamically realloced tables are malloced to begin with. 131 */ 132 void 133 set_hunkmax(void) 134 { 135 if (p_line == NULL) 136 p_line = calloc((size_t) hunkmax, sizeof(char *)); 137 if (p_len == NULL) 138 p_len = calloc((size_t) hunkmax, sizeof(short)); 139 if (p_char == NULL) 140 p_char = calloc((size_t) hunkmax, sizeof(char)); 141 } 142 143 /* 144 * Enlarge the arrays containing the current hunk of patch. 145 */ 146 static void 147 grow_hunkmax(void) 148 { 149 int new_hunkmax; 150 char **new_p_line; 151 short *new_p_len; 152 char *new_p_char; 153 154 new_hunkmax = hunkmax * 2; 155 156 if (p_line == NULL || p_len == NULL || p_char == NULL) 157 fatal("Internal memory allocation error\n"); 158 159 new_p_line = pch_realloc(p_line, new_hunkmax, sizeof(char *)); 160 if (new_p_line == NULL) 161 free(p_line); 162 163 new_p_len = pch_realloc(p_len, new_hunkmax, sizeof(short)); 164 if (new_p_len == NULL) 165 free(p_len); 166 167 new_p_char = pch_realloc(p_char, new_hunkmax, sizeof(char)); 168 if (new_p_char == NULL) 169 free(p_char); 170 171 p_char = new_p_char; 172 p_len = new_p_len; 173 p_line = new_p_line; 174 175 if (p_line != NULL && p_len != NULL && p_char != NULL) { 176 hunkmax = new_hunkmax; 177 return; 178 } 179 180 if (!using_plan_a) 181 fatal("out of memory\n"); 182 out_of_mem = true; /* whatever is null will be allocated again */ 183 /* from within plan_a(), of all places */ 184 } 185 186 /* True if the remainder of the patch file contains a diff of some sort. */ 187 188 bool 189 there_is_another_patch(void) 190 { 191 bool exists = false; 192 193 if (p_base != 0L && p_base >= p_filesize) { 194 if (verbose) 195 say("done\n"); 196 return false; 197 } 198 if (verbose) 199 say("Hmm..."); 200 diff_type = intuit_diff_type(); 201 if (!diff_type) { 202 if (p_base != 0L) { 203 if (verbose) 204 say(" Ignoring the trailing garbage.\ndone\n"); 205 } else 206 say(" I can't seem to find a patch in there anywhere.\n"); 207 return false; 208 } 209 if (verbose) 210 say(" %sooks like %s to me...\n", 211 (p_base == 0L ? "L" : "The next patch l"), 212 diff_type == UNI_DIFF ? "a unified diff" : 213 diff_type == CONTEXT_DIFF ? "a context diff" : 214 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 215 diff_type == NORMAL_DIFF ? "a normal diff" : 216 "an ed script"); 217 if (p_indent && verbose) 218 say("(Patch is indented %d space%s.)\n", p_indent, 219 p_indent == 1 ? "" : "s"); 220 skip_to(p_start, p_sline); 221 while (filearg[0] == NULL) { 222 if (force || batch) { 223 say("No file to patch. Skipping...\n"); 224 filearg[0] = savestr(bestguess); 225 skip_rest_of_patch = true; 226 return true; 227 } 228 ask("File to patch: "); 229 if (*buf != '\n') { 230 free(bestguess); 231 bestguess = savestr(buf); 232 filearg[0] = fetchname(buf, &exists, 0); 233 } 234 if (!exists) { 235 ask("No file found--skip this patch? [n] "); 236 if (*buf != 'y') 237 continue; 238 if (verbose) 239 say("Skipping patch...\n"); 240 free(filearg[0]); 241 filearg[0] = fetchname(bestguess, &exists, 0); 242 skip_rest_of_patch = true; 243 return true; 244 } 245 } 246 return true; 247 } 248 249 /* Determine what kind of diff is in the remaining part of the patch file. */ 250 251 static int 252 intuit_diff_type(void) 253 { 254 long this_line = 0, previous_line; 255 long first_command_line = -1; 256 LINENUM fcl_line = -1; 257 bool last_line_was_command = false, this_is_a_command = false; 258 bool stars_last_line = false, stars_this_line = false; 259 char *s, *t; 260 int indent, retval; 261 struct file_name names[MAX_FILE]; 262 263 memset(names, 0, sizeof(names)); 264 ok_to_create_file = false; 265 fseek(pfp, p_base, SEEK_SET); 266 p_input_line = p_bline - 1; 267 for (;;) { 268 previous_line = this_line; 269 last_line_was_command = this_is_a_command; 270 stars_last_line = stars_this_line; 271 this_line = ftell(pfp); 272 indent = 0; 273 p_input_line++; 274 if (fgets(buf, buf_len, pfp) == NULL) { 275 if (first_command_line >= 0L) { 276 /* nothing but deletes!? */ 277 p_start = first_command_line; 278 p_sline = fcl_line; 279 retval = ED_DIFF; 280 goto scan_exit; 281 } else { 282 p_start = this_line; 283 p_sline = p_input_line; 284 retval = 0; 285 goto scan_exit; 286 } 287 } 288 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 289 if (*s == '\t') 290 indent += 8 - (indent % 8); 291 else 292 indent++; 293 } 294 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 295 ; 296 this_is_a_command = (isdigit((unsigned char)*s) && 297 (*t == 'd' || *t == 'c' || *t == 'a')); 298 if (first_command_line < 0L && this_is_a_command) { 299 first_command_line = this_line; 300 fcl_line = p_input_line; 301 p_indent = indent; /* assume this for now */ 302 } 303 if (!stars_last_line && strnEQ(s, "*** ", 4)) 304 names[OLD_FILE].path = fetchname(s + 4, 305 &names[OLD_FILE].exists, strippath); 306 else if (strnEQ(s, "--- ", 4)) 307 names[NEW_FILE].path = fetchname(s + 4, 308 &names[NEW_FILE].exists, strippath); 309 else if (strnEQ(s, "+++ ", 4)) 310 /* pretend it is the old name */ 311 names[OLD_FILE].path = fetchname(s + 4, 312 &names[OLD_FILE].exists, strippath); 313 else if (strnEQ(s, "Index:", 6)) 314 names[INDEX_FILE].path = fetchname(s + 6, 315 &names[INDEX_FILE].exists, strippath); 316 else if (strnEQ(s, "Prereq:", 7)) { 317 for (t = s + 7; isspace((unsigned char)*t); t++) 318 ; 319 revision = savestr(t); 320 for (t = revision; *t && !isspace((unsigned char)*t); t++) 321 ; 322 *t = '\0'; 323 if (*revision == '\0') { 324 free(revision); 325 revision = NULL; 326 } 327 } 328 if ((!diff_type || diff_type == ED_DIFF) && 329 first_command_line >= 0L && 330 strEQ(s, ".\n")) { 331 p_indent = indent; 332 p_start = first_command_line; 333 p_sline = fcl_line; 334 retval = ED_DIFF; 335 goto scan_exit; 336 } 337 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 338 if (strnEQ(s + 4, "0,0", 3)) 339 ok_to_create_file = true; 340 p_indent = indent; 341 p_start = this_line; 342 p_sline = p_input_line; 343 retval = UNI_DIFF; 344 goto scan_exit; 345 } 346 stars_this_line = strnEQ(s, "********", 8); 347 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 348 strnEQ(s, "*** ", 4)) { 349 if (atol(s + 4) == 0) 350 ok_to_create_file = true; 351 /* 352 * If this is a new context diff the character just 353 * before the newline is a '*'. 354 */ 355 while (*s != '\n') 356 s++; 357 p_indent = indent; 358 p_start = previous_line; 359 p_sline = p_input_line - 1; 360 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 361 goto scan_exit; 362 } 363 if ((!diff_type || diff_type == NORMAL_DIFF) && 364 last_line_was_command && 365 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 366 p_start = previous_line; 367 p_sline = p_input_line - 1; 368 p_indent = indent; 369 retval = NORMAL_DIFF; 370 goto scan_exit; 371 } 372 } 373 scan_exit: 374 if (retval == UNI_DIFF) { 375 /* unswap old and new */ 376 struct file_name tmp = names[OLD_FILE]; 377 names[OLD_FILE] = names[NEW_FILE]; 378 names[NEW_FILE] = tmp; 379 } 380 if (filearg[0] == NULL) { 381 if (posix) 382 filearg[0] = posix_name(names, ok_to_create_file); 383 else { 384 /* Ignore the Index: name for context diffs, like GNU */ 385 if (names[OLD_FILE].path != NULL || 386 names[NEW_FILE].path != NULL) { 387 free(names[INDEX_FILE].path); 388 names[INDEX_FILE].path = NULL; 389 } 390 filearg[0] = best_name(names, ok_to_create_file); 391 } 392 } 393 394 free(bestguess); 395 bestguess = NULL; 396 if (filearg[0] != NULL) 397 bestguess = savestr(filearg[0]); 398 else if (!ok_to_create_file) { 399 /* 400 * We don't want to create a new file but we need a 401 * filename to set bestguess. Avoid setting filearg[0] 402 * so the file is not created automatically. 403 */ 404 if (posix) 405 bestguess = posix_name(names, true); 406 else 407 bestguess = best_name(names, true); 408 } 409 free(names[OLD_FILE].path); 410 free(names[NEW_FILE].path); 411 free(names[INDEX_FILE].path); 412 return retval; 413 } 414 415 /* 416 * Remember where this patch ends so we know where to start up again. 417 */ 418 static void 419 next_intuit_at(LINENUM file_pos, LINENUM file_line) 420 { 421 p_base = file_pos; 422 p_bline = file_line; 423 } 424 425 /* 426 * Basically a verbose fseek() to the actual diff listing. 427 */ 428 static void 429 skip_to(LINENUM file_pos, LINENUM file_line) 430 { 431 char *ret; 432 433 if (p_base > file_pos) 434 fatal("Internal error: seek %ld>%ld\n", p_base, file_pos); 435 if (verbose && p_base < file_pos) { 436 fseek(pfp, p_base, SEEK_SET); 437 say("The text leading up to this was:\n--------------------------\n"); 438 while (ftell(pfp) < file_pos) { 439 ret = fgets(buf, buf_len, pfp); 440 if (ret == NULL) 441 fatal("Unexpected end of file\n"); 442 say("|%s", buf); 443 } 444 say("--------------------------\n"); 445 } else 446 fseek(pfp, file_pos, SEEK_SET); 447 p_input_line = file_line - 1; 448 } 449 450 /* Make this a function for better debugging. */ 451 __dead static void 452 malformed(void) 453 { 454 fatal("malformed patch at line %ld: %s", p_input_line, buf); 455 /* about as informative as "Syntax error" in C */ 456 } 457 458 static LINENUM 459 getlinenum(const char *s) 460 { 461 LINENUM l = (LINENUM)atol(s); 462 if (l < 0) { 463 l = 0; 464 malformed(); 465 } 466 return l; 467 } 468 469 static LINENUM 470 getskiplinenum(char **p) 471 { 472 char *s = *p; 473 LINENUM l = getlinenum(s); 474 while (isdigit((unsigned char)*s)) 475 s++; 476 *p = s; 477 return l; 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 fseek(pfp, -1L, 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 long 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 misformed */ 515 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 516 bool repl_missing; /* we are now backtracking */ 517 long 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, *ret; 521 int context = 0; 522 523 while (p_end >= 0) { 524 if (p_end == p_efake) 525 p_end = p_bfake; /* don't free twice */ 526 else 527 free(p_line[p_end]); 528 p_end--; 529 } 530 p_efake = -1; 531 532 p_max = hunkmax; /* gets reduced when --- found */ 533 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 534 line_beginning = ftell(pfp); 535 repl_beginning = 0; 536 fillcnt = 0; 537 fillsrc = 0; 538 filldst = 0; 539 ptrn_spaces_eaten = false; 540 repl_could_be_missing = true; 541 repl_missing = false; 542 repl_backtrack_position = 0; 543 repl_patch_line = 0; 544 ptrn_copiable = 0; 545 546 ret = pgets(buf, buf_len, pfp); 547 p_input_line++; 548 if (ret == NULL || strnNE(buf, "********", 8)) { 549 next_intuit_at(line_beginning, p_input_line); 550 return false; 551 } 552 p_context = 100; 553 p_hunk_beg = p_input_line + 1; 554 while (p_end < p_max) { 555 line_beginning = ftell(pfp); 556 ret = pgets(buf, buf_len, pfp); 557 p_input_line++; 558 if (ret == NULL) { 559 if (repl_beginning && repl_could_be_missing) { 560 repl_missing = true; 561 goto hunk_done; 562 } 563 fatal("unexpected end of file in patch\n"); 564 } 565 p_end++; 566 if (p_end >= hunkmax) 567 fatal("Internal error: hunk larger than hunk " 568 "buffer size"); 569 p_char[p_end] = *buf; 570 p_line[p_end] = NULL; 571 switch (*buf) { 572 case '*': 573 if (strnEQ(buf, "********", 8)) { 574 if (repl_beginning && repl_could_be_missing) { 575 repl_missing = true; 576 goto hunk_done; 577 } else 578 fatal("unexpected end of hunk " 579 "at line %ld\n", 580 p_input_line); 581 } 582 if (p_end != 0) { 583 if (repl_beginning && repl_could_be_missing) { 584 repl_missing = true; 585 goto hunk_done; 586 } 587 fatal("unexpected *** at line %ld: %s", 588 p_input_line, buf); 589 } 590 context = 0; 591 p_line[p_end] = savestr(buf); 592 if (out_of_mem) { 593 p_end--; 594 return false; 595 } 596 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 597 ; 598 if (!*s) 599 malformed(); 600 if (strnEQ(s, "0,0", 3)) 601 memmove(s, s + 2, strlen(s + 2) + 1); 602 p_first = getskiplinenum(&s); 603 if (*s == ',') { 604 for (; *s && !isdigit((unsigned char)*s); s++) 605 ; 606 if (!*s) 607 malformed(); 608 p_ptrn_lines = (getlinenum(s)) - p_first + 1; 609 if (p_ptrn_lines < 0) 610 malformed(); 611 } else if (p_first) 612 p_ptrn_lines = 1; 613 else { 614 p_ptrn_lines = 0; 615 p_first = 1; 616 } 617 if (p_first >= LINENUM_MAX - p_ptrn_lines || 618 p_ptrn_lines >= LINENUM_MAX - 6) 619 malformed(); 620 621 /* we need this much at least */ 622 p_max = p_ptrn_lines + 6; 623 while (p_max >= hunkmax) 624 grow_hunkmax(); 625 p_max = hunkmax; 626 break; 627 case '-': 628 if (buf[1] == '-') { 629 if (repl_beginning || 630 (p_end != p_ptrn_lines + 1 + 631 (p_char[p_end - 1] == '\n'))) { 632 if (p_end == 1) { 633 /* 634 * `old' lines were omitted; 635 * set up to fill them in 636 * from 'new' context lines. 637 */ 638 p_end = p_ptrn_lines + 1; 639 fillsrc = p_end + 1; 640 filldst = 1; 641 fillcnt = p_ptrn_lines; 642 } else { 643 if (repl_beginning) { 644 if (repl_could_be_missing) { 645 repl_missing = true; 646 goto hunk_done; 647 } 648 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 649 p_input_line, p_hunk_beg + repl_beginning); 650 } else { 651 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 652 (p_end <= p_ptrn_lines 653 ? "Premature" 654 : "Overdue"), 655 p_input_line, p_hunk_beg); 656 } 657 } 658 } 659 repl_beginning = p_end; 660 repl_backtrack_position = ftell(pfp); 661 repl_patch_line = p_input_line; 662 p_line[p_end] = savestr(buf); 663 if (out_of_mem) { 664 p_end--; 665 return false; 666 } 667 p_char[p_end] = '='; 668 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 669 ; 670 if (!*s) 671 malformed(); 672 p_newfirst = getskiplinenum(&s); 673 if (*s == ',') { 674 for (; *s && !isdigit((unsigned char)*s); s++) 675 ; 676 if (!*s) 677 malformed(); 678 p_repl_lines = (getlinenum(s)) - 679 p_newfirst + 1; 680 if (p_repl_lines < 0) 681 malformed(); 682 } else if (p_newfirst) 683 p_repl_lines = 1; 684 else { 685 p_repl_lines = 0; 686 p_newfirst = 1; 687 } 688 if (p_newfirst >= LINENUM_MAX - p_repl_lines || 689 p_repl_lines >= LINENUM_MAX - p_end) 690 malformed(); 691 p_max = p_repl_lines + p_end; 692 if (p_max > MAXHUNKSIZE) 693 fatal("hunk too large (%ld lines) at line %ld: %s", 694 p_max, p_input_line, buf); 695 while (p_max >= hunkmax) 696 grow_hunkmax(); 697 if (p_repl_lines != ptrn_copiable && 698 (p_context != 0 || p_repl_lines != 1)) 699 repl_could_be_missing = false; 700 break; 701 } 702 goto change_line; 703 case '+': 704 case '!': 705 repl_could_be_missing = false; 706 change_line: 707 if (buf[1] == '\n' && canonicalize) 708 strlcpy(buf + 1, " \n", buf_len - 1); 709 if (!isspace((unsigned char)buf[1]) && buf[1] != '>' && 710 buf[1] != '<' && 711 repl_beginning && repl_could_be_missing) { 712 repl_missing = true; 713 goto hunk_done; 714 } 715 if (context >= 0) { 716 if (context < p_context) 717 p_context = context; 718 context = -1000; 719 } 720 p_line[p_end] = savestr(buf + 2); 721 if (out_of_mem) { 722 p_end--; 723 return false; 724 } 725 if (p_end == p_ptrn_lines) { 726 if (remove_special_line()) { 727 int len; 728 729 len = strlen(p_line[p_end]) - 1; 730 (p_line[p_end])[len] = 0; 731 } 732 } 733 break; 734 case '\t': 735 case '\n': /* assume the 2 spaces got eaten */ 736 if (repl_beginning && repl_could_be_missing && 737 (!ptrn_spaces_eaten || 738 diff_type == NEW_CONTEXT_DIFF)) { 739 repl_missing = true; 740 goto hunk_done; 741 } 742 p_line[p_end] = savestr(buf); 743 if (out_of_mem) { 744 p_end--; 745 return false; 746 } 747 if (p_end != p_ptrn_lines + 1) { 748 ptrn_spaces_eaten |= (repl_beginning != 0); 749 context++; 750 if (!repl_beginning) 751 ptrn_copiable++; 752 p_char[p_end] = ' '; 753 } 754 break; 755 case ' ': 756 if (!isspace((unsigned char)buf[1]) && 757 repl_beginning && repl_could_be_missing) { 758 repl_missing = true; 759 goto hunk_done; 760 } 761 context++; 762 if (!repl_beginning) 763 ptrn_copiable++; 764 p_line[p_end] = savestr(buf + 2); 765 if (out_of_mem) { 766 p_end--; 767 return false; 768 } 769 break; 770 default: 771 if (repl_beginning && repl_could_be_missing) { 772 repl_missing = true; 773 goto hunk_done; 774 } 775 malformed(); 776 } 777 /* set up p_len for strncmp() so we don't have to */ 778 /* assume null termination */ 779 if (p_line[p_end]) 780 p_len[p_end] = strlen(p_line[p_end]); 781 else 782 p_len[p_end] = 0; 783 } 784 785 hunk_done: 786 if (p_end >= 0 && !repl_beginning) 787 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 788 789 if (repl_missing) { 790 791 /* reset state back to just after --- */ 792 p_input_line = repl_patch_line; 793 for (p_end--; p_end > repl_beginning; p_end--) 794 free(p_line[p_end]); 795 fseek(pfp, repl_backtrack_position, SEEK_SET); 796 797 /* redundant 'new' context lines were omitted - set */ 798 /* up to fill them in from the old file context */ 799 if (!p_context && p_repl_lines == 1) { 800 p_repl_lines = 0; 801 p_max--; 802 } 803 fillsrc = 1; 804 filldst = repl_beginning + 1; 805 fillcnt = p_repl_lines; 806 p_end = p_max; 807 } else if (!p_context && fillcnt == 1) { 808 /* the first hunk was a null hunk with no context */ 809 /* and we were expecting one line -- fix it up. */ 810 while (filldst < p_end) { 811 p_line[filldst] = p_line[filldst + 1]; 812 p_char[filldst] = p_char[filldst + 1]; 813 p_len[filldst] = p_len[filldst + 1]; 814 filldst++; 815 } 816 #if 0 817 repl_beginning--; /* this doesn't need to be fixed */ 818 #endif 819 p_end--; 820 p_first++; /* do append rather than insert */ 821 fillcnt = 0; 822 p_ptrn_lines = 0; 823 } 824 if (diff_type == CONTEXT_DIFF && 825 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 826 if (verbose) 827 say("%s\n%s\n%s\n", 828 "(Fascinating--this is really a new-style context diff but without", 829 "the telltale extra asterisks on the *** line that usually indicate", 830 "the new style...)"); 831 diff_type = NEW_CONTEXT_DIFF; 832 } 833 /* if there were omitted context lines, fill them in now */ 834 if (fillcnt) { 835 p_bfake = filldst; /* remember where not to free() */ 836 p_efake = filldst + fillcnt - 1; 837 while (fillcnt-- > 0) { 838 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 839 fillsrc++; 840 if (fillsrc > p_end) 841 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 842 p_hunk_beg); 843 p_line[filldst] = p_line[fillsrc]; 844 p_char[filldst] = p_char[fillsrc]; 845 p_len[filldst] = p_len[fillsrc]; 846 fillsrc++; 847 filldst++; 848 } 849 while (fillsrc <= p_end && fillsrc != repl_beginning && 850 p_char[fillsrc] != ' ') 851 fillsrc++; 852 #ifdef DEBUGGING 853 if (debug & 64) 854 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 855 fillsrc, filldst, repl_beginning, p_end + 1); 856 #endif 857 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 858 malformed(); 859 if (filldst != p_end + 1 && filldst != repl_beginning) 860 malformed(); 861 } 862 if (p_line[p_end] != NULL) { 863 if (remove_special_line()) { 864 p_len[p_end] -= 1; 865 (p_line[p_end])[p_len[p_end]] = 0; 866 } 867 } 868 } else if (diff_type == UNI_DIFF) { 869 LINENUM fillold; /* index of old lines */ 870 LINENUM fillnew; /* index of new lines */ 871 char ch; 872 873 line_beginning = ftell(pfp); /* file pos of the current line */ 874 ret = pgets(buf, buf_len, pfp); 875 p_input_line++; 876 if (ret == NULL || strnNE(buf, "@@ -", 4)) { 877 next_intuit_at(line_beginning, p_input_line); 878 return false; 879 } 880 s = buf + 4; 881 if (!*s) 882 malformed(); 883 p_first = getskiplinenum(&s); 884 if (*s == ',') { 885 s++; 886 p_ptrn_lines = getskiplinenum(&s); 887 } else 888 p_ptrn_lines = 1; 889 if (p_first >= LINENUM_MAX - p_ptrn_lines) 890 malformed(); 891 if (*s == ' ') 892 s++; 893 if (*s != '+' || !*++s) 894 malformed(); 895 p_newfirst = getskiplinenum(&s); 896 if (*s == ',') { 897 s++; 898 p_repl_lines = getskiplinenum(&s); 899 } else 900 p_repl_lines = 1; 901 if (*s == ' ') 902 s++; 903 if (*s != '@') 904 malformed(); 905 if (p_first >= LINENUM_MAX - p_ptrn_lines || 906 p_newfirst > LINENUM_MAX - p_repl_lines || 907 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 908 malformed(); 909 if (!p_ptrn_lines) 910 p_first++; /* do append rather than insert */ 911 p_max = p_ptrn_lines + p_repl_lines + 1; 912 while (p_max >= hunkmax) 913 grow_hunkmax(); 914 fillold = 1; 915 fillnew = fillold + p_ptrn_lines; 916 p_end = fillnew + p_repl_lines; 917 snprintf(buf, buf_len, "*** %ld,%ld ****\n", p_first, 918 p_first + p_ptrn_lines - 1); 919 p_line[0] = savestr(buf); 920 if (out_of_mem) { 921 p_end = -1; 922 return false; 923 } 924 p_char[0] = '*'; 925 snprintf(buf, buf_len, "--- %ld,%ld ----\n", p_newfirst, 926 p_newfirst + p_repl_lines - 1); 927 p_line[fillnew] = savestr(buf); 928 if (out_of_mem) { 929 p_end = 0; 930 return false; 931 } 932 p_char[fillnew++] = '='; 933 p_context = 100; 934 context = 0; 935 p_hunk_beg = p_input_line + 1; 936 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 937 line_beginning = ftell(pfp); 938 ret = pgets(buf, buf_len, pfp); 939 p_input_line++; 940 if (ret == NULL) { 941 if (p_max - fillnew < 3) { 942 /* assume blank lines got chopped */ 943 strlcpy(buf, " \n", buf_len); 944 } else { 945 fatal("unexpected end of file in patch\n"); 946 } 947 } 948 if (*buf == '\t' || *buf == '\n') { 949 ch = ' '; /* assume the space got eaten */ 950 s = savestr(buf); 951 } else { 952 ch = *buf; 953 s = savestr(buf + 1); 954 } 955 if (out_of_mem) { 956 while (--fillnew > p_ptrn_lines) 957 free(p_line[fillnew]); 958 p_end = fillold - 1; 959 return false; 960 } 961 switch (ch) { 962 case '-': 963 if (fillold > p_ptrn_lines) { 964 free(s); 965 p_end = fillnew - 1; 966 malformed(); 967 } 968 p_char[fillold] = ch; 969 p_line[fillold] = s; 970 p_len[fillold++] = strlen(s); 971 if (fillold > p_ptrn_lines) { 972 if (remove_special_line()) { 973 p_len[fillold - 1] -= 1; 974 s[p_len[fillold - 1]] = 0; 975 } 976 } 977 break; 978 case '=': 979 ch = ' '; 980 /* FALL THROUGH */ 981 case ' ': 982 if (fillold > p_ptrn_lines) { 983 free(s); 984 while (--fillnew > p_ptrn_lines) 985 free(p_line[fillnew]); 986 p_end = fillold - 1; 987 malformed(); 988 } 989 context++; 990 p_char[fillold] = ch; 991 p_line[fillold] = s; 992 p_len[fillold++] = strlen(s); 993 s = savestr(s); 994 if (out_of_mem) { 995 while (--fillnew > p_ptrn_lines) 996 free(p_line[fillnew]); 997 p_end = fillold - 1; 998 return false; 999 } 1000 if (fillold > p_ptrn_lines) { 1001 if (remove_special_line()) { 1002 p_len[fillold - 1] -= 1; 1003 s[p_len[fillold - 1]] = 0; 1004 } 1005 } 1006 /* FALL THROUGH */ 1007 case '+': 1008 if (fillnew > p_end) { 1009 free(s); 1010 while (--fillnew > p_ptrn_lines) 1011 free(p_line[fillnew]); 1012 p_end = fillold - 1; 1013 malformed(); 1014 } 1015 p_char[fillnew] = ch; 1016 p_line[fillnew] = s; 1017 p_len[fillnew++] = strlen(s); 1018 if (fillold > p_ptrn_lines) { 1019 if (remove_special_line()) { 1020 p_len[fillnew - 1] -= 1; 1021 s[p_len[fillnew - 1]] = 0; 1022 } 1023 } 1024 break; 1025 default: 1026 p_end = fillnew; 1027 malformed(); 1028 } 1029 if (ch != ' ' && context > 0) { 1030 if (context < p_context) 1031 p_context = context; 1032 context = -1000; 1033 } 1034 } /* while */ 1035 } else { /* normal diff--fake it up */ 1036 char hunk_type; 1037 int i; 1038 LINENUM min, max; 1039 1040 line_beginning = ftell(pfp); 1041 p_context = 0; 1042 ret = pgets(buf, buf_len, pfp); 1043 p_input_line++; 1044 if (ret == NULL || !isdigit((unsigned char)*buf)) { 1045 next_intuit_at(line_beginning, p_input_line); 1046 return false; 1047 } 1048 s = buf; 1049 p_first = getskiplinenum(&s); 1050 if (*s == ',') { 1051 s++; 1052 p_ptrn_lines = getskiplinenum(&s) - p_first + 1; 1053 } else 1054 p_ptrn_lines = (*s != 'a'); 1055 if (p_first >= LINENUM_MAX - p_ptrn_lines) 1056 malformed(); 1057 hunk_type = *s++; 1058 if (hunk_type == 'a') 1059 p_first++; /* do append rather than insert */ 1060 min = getskiplinenum(&s); 1061 if (*s == ',') 1062 max = getlinenum(++s); 1063 else 1064 max = min; 1065 if (min < 0 || min > max || max - min == LINENUM_MAX) 1066 malformed(); 1067 if (hunk_type == 'd') 1068 min++; 1069 p_end = p_ptrn_lines + 1 + max - min + 1; 1070 p_newfirst = min; 1071 p_repl_lines = max - min + 1; 1072 if (p_newfirst > LINENUM_MAX - p_repl_lines || 1073 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1074 malformed(); 1075 p_end = p_ptrn_lines + p_repl_lines + 1; 1076 if (p_end > MAXHUNKSIZE) 1077 fatal("hunk too large (%ld lines) at line %ld: %s", 1078 p_end, p_input_line, buf); 1079 while (p_end >= hunkmax) 1080 grow_hunkmax(); 1081 snprintf(buf, buf_len, "*** %ld,%ld\n", p_first, 1082 p_first + p_ptrn_lines - 1); 1083 p_line[0] = savestr(buf); 1084 if (out_of_mem) { 1085 p_end = -1; 1086 return false; 1087 } 1088 p_char[0] = '*'; 1089 for (i = 1; i <= p_ptrn_lines; i++) { 1090 ret = pgets(buf, buf_len, pfp); 1091 p_input_line++; 1092 if (ret == NULL) 1093 fatal("unexpected end of file in patch at line %ld\n", 1094 p_input_line); 1095 if (*buf != '<') 1096 fatal("< expected at line %ld of patch\n", 1097 p_input_line); 1098 p_line[i] = savestr(buf + 2); 1099 if (out_of_mem) { 1100 p_end = i - 1; 1101 return false; 1102 } 1103 p_len[i] = strlen(p_line[i]); 1104 p_char[i] = '-'; 1105 } 1106 1107 if (remove_special_line()) { 1108 p_len[i - 1] -= 1; 1109 (p_line[i - 1])[p_len[i - 1]] = 0; 1110 } 1111 if (hunk_type == 'c') { 1112 ret = pgets(buf, buf_len, pfp); 1113 p_input_line++; 1114 if (ret == NULL) 1115 fatal("unexpected end of file in patch at line %ld\n", 1116 p_input_line); 1117 if (*buf != '-') 1118 fatal("--- expected at line %ld of patch\n", 1119 p_input_line); 1120 } 1121 snprintf(buf, buf_len, "--- %ld,%ld\n", min, max); 1122 p_line[i] = savestr(buf); 1123 if (out_of_mem) { 1124 p_end = i - 1; 1125 return false; 1126 } 1127 p_char[i] = '='; 1128 for (i++; i <= p_end; i++) { 1129 ret = pgets(buf, buf_len, pfp); 1130 p_input_line++; 1131 if (ret == NULL) 1132 fatal("unexpected end of file in patch at line %ld\n", 1133 p_input_line); 1134 if (*buf != '>') 1135 fatal("> expected at line %ld of patch\n", 1136 p_input_line); 1137 p_line[i] = savestr(buf + 2); 1138 if (out_of_mem) { 1139 p_end = i - 1; 1140 return false; 1141 } 1142 p_len[i] = strlen(p_line[i]); 1143 p_char[i] = '+'; 1144 } 1145 1146 if (remove_special_line()) { 1147 p_len[i - 1] -= 1; 1148 (p_line[i - 1])[p_len[i - 1]] = 0; 1149 } 1150 } 1151 if (reverse) /* backwards patch? */ 1152 if (!pch_swap()) 1153 say("Not enough memory to swap next hunk!\n"); 1154 #ifdef DEBUGGING 1155 if (debug & 2) { 1156 int i; 1157 char special; 1158 1159 for (i = 0; i <= p_end; i++) { 1160 if (i == p_ptrn_lines) 1161 special = '^'; 1162 else 1163 special = ' '; 1164 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1165 special, p_line[i]); 1166 fflush(stderr); 1167 } 1168 } 1169 #endif 1170 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1171 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1172 return true; 1173 } 1174 1175 /* 1176 * Input a line from the patch file, worrying about indentation. 1177 */ 1178 static char * 1179 pgets(char *bf, int sz, FILE *fp) 1180 { 1181 char *s, *ret = fgets(bf, sz, fp); 1182 int indent = 0; 1183 1184 if (p_indent && ret != NULL) { 1185 for (s = buf; 1186 indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X'); 1187 s++) { 1188 if (*s == '\t') 1189 indent += 8 - (indent % 7); 1190 else 1191 indent++; 1192 } 1193 if (buf != s && strlcpy(buf, s, buf_len) >= buf_len) 1194 fatal("buffer too small in pgets()\n"); 1195 } 1196 return ret; 1197 } 1198 1199 /* 1200 * Reverse the old and new portions of the current hunk. 1201 */ 1202 bool 1203 pch_swap(void) 1204 { 1205 char **tp_line; /* the text of the hunk */ 1206 short *tp_len; /* length of each line */ 1207 char *tp_char; /* +, -, and ! */ 1208 LINENUM i; 1209 LINENUM n; 1210 bool blankline = false; 1211 char *s; 1212 1213 i = p_first; 1214 p_first = p_newfirst; 1215 p_newfirst = i; 1216 1217 /* make a scratch copy */ 1218 1219 tp_line = p_line; 1220 tp_len = p_len; 1221 tp_char = p_char; 1222 p_line = NULL; /* force set_hunkmax to allocate again */ 1223 p_len = NULL; 1224 p_char = NULL; 1225 set_hunkmax(); 1226 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1227 1228 free(p_line); 1229 p_line = tp_line; 1230 free(p_len); 1231 p_len = tp_len; 1232 free(p_char); 1233 p_char = tp_char; 1234 return false; /* not enough memory to swap hunk! */ 1235 } 1236 /* now turn the new into the old */ 1237 1238 i = p_ptrn_lines + 1; 1239 if (tp_char[i] == '\n') { /* account for possible blank line */ 1240 blankline = true; 1241 i++; 1242 } 1243 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1244 if (p_efake <= i) 1245 n = p_end - i + 1; 1246 else 1247 n = -i; 1248 p_efake += n; 1249 p_bfake += n; 1250 } 1251 for (n = 0; i <= p_end; i++, n++) { 1252 p_line[n] = tp_line[i]; 1253 p_char[n] = tp_char[i]; 1254 if (p_char[n] == '+') 1255 p_char[n] = '-'; 1256 p_len[n] = tp_len[i]; 1257 } 1258 if (blankline) { 1259 i = p_ptrn_lines + 1; 1260 p_line[n] = tp_line[i]; 1261 p_char[n] = tp_char[i]; 1262 p_len[n] = tp_len[i]; 1263 n++; 1264 } 1265 if (p_char[0] != '=') 1266 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1267 p_input_line, p_char[0]); 1268 p_char[0] = '*'; 1269 for (s = p_line[0]; *s; s++) 1270 if (*s == '-') 1271 *s = '*'; 1272 1273 /* now turn the old into the new */ 1274 1275 if (p_char[0] != '*') 1276 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1277 p_input_line, p_char[0]); 1278 tp_char[0] = '='; 1279 for (s = tp_line[0]; *s; s++) 1280 if (*s == '*') 1281 *s = '-'; 1282 for (i = 0; n <= p_end; i++, n++) { 1283 p_line[n] = tp_line[i]; 1284 p_char[n] = tp_char[i]; 1285 if (p_char[n] == '-') 1286 p_char[n] = '+'; 1287 p_len[n] = tp_len[i]; 1288 } 1289 1290 if (i != p_ptrn_lines + 1) 1291 fatal("Malformed patch at line %ld: expected %ld lines, " 1292 "got %ld\n", 1293 p_input_line, p_ptrn_lines + 1, i); 1294 1295 i = p_ptrn_lines; 1296 p_ptrn_lines = p_repl_lines; 1297 p_repl_lines = i; 1298 1299 free(tp_line); 1300 free(tp_len); 1301 free(tp_char); 1302 1303 return true; 1304 } 1305 1306 /* 1307 * Return the specified line position in the old file of the old context. 1308 */ 1309 LINENUM 1310 pch_first(void) 1311 { 1312 return p_first; 1313 } 1314 1315 /* 1316 * Return the number of lines of old context. 1317 */ 1318 LINENUM 1319 pch_ptrn_lines(void) 1320 { 1321 return p_ptrn_lines; 1322 } 1323 1324 /* 1325 * Return the probable line position in the new file of the first line. 1326 */ 1327 LINENUM 1328 pch_newfirst(void) 1329 { 1330 return p_newfirst; 1331 } 1332 1333 /* 1334 * Return the number of lines in the replacement text including context. 1335 */ 1336 LINENUM 1337 pch_repl_lines(void) 1338 { 1339 return p_repl_lines; 1340 } 1341 1342 /* 1343 * Return the number of lines in the whole hunk. 1344 */ 1345 LINENUM 1346 pch_end(void) 1347 { 1348 return p_end; 1349 } 1350 1351 /* 1352 * Return the number of context lines before the first changed line. 1353 */ 1354 LINENUM 1355 pch_context(void) 1356 { 1357 return p_context; 1358 } 1359 1360 /* 1361 * Return the length of a particular patch line. 1362 */ 1363 short 1364 pch_line_len(LINENUM line) 1365 { 1366 return p_len[line]; 1367 } 1368 1369 /* 1370 * Return the control character (+, -, *, !, etc) for a patch line. 1371 */ 1372 char 1373 pch_char(LINENUM line) 1374 { 1375 return p_char[line]; 1376 } 1377 1378 /* 1379 * Return a pointer to a particular patch line. 1380 */ 1381 char * 1382 pfetch(LINENUM line) 1383 { 1384 return p_line[line]; 1385 } 1386 1387 /* 1388 * Return where in the patch file this hunk began, for error messages. 1389 */ 1390 LINENUM 1391 pch_hunk_beg(void) 1392 { 1393 return p_hunk_beg; 1394 } 1395 1396 /* 1397 * Apply an ed script by feeding ed itself. 1398 */ 1399 void 1400 do_ed_script(void) 1401 { 1402 char *t; 1403 long beginning_of_this_line; 1404 FILE *pipefp = NULL; 1405 int continuation; 1406 1407 if (!skip_rest_of_patch) { 1408 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1409 unlink(TMPOUTNAME); 1410 fatal("can't create temp file %s", TMPOUTNAME); 1411 } 1412 snprintf(buf, buf_len, "%s -S%s %s", _PATH_ED, 1413 verbose ? "" : "s", TMPOUTNAME); 1414 pipefp = popen(buf, "w"); 1415 } 1416 for (;;) { 1417 beginning_of_this_line = ftell(pfp); 1418 if (pgets(buf, buf_len, pfp) == NULL) { 1419 next_intuit_at(beginning_of_this_line, p_input_line); 1420 break; 1421 } 1422 p_input_line++; 1423 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1424 ; 1425 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1426 if (isdigit((unsigned char)*buf) && (*t == 'a' || *t == 'c' || 1427 *t == 'd' || *t == 'i' || *t == 's')) { 1428 if (pipefp != NULL) 1429 fputs(buf, pipefp); 1430 if (*t == 's') { 1431 for (;;) { 1432 continuation = 0; 1433 t = strchr(buf, '\0') - 1; 1434 while (--t >= buf && *t == '\\') 1435 continuation = !continuation; 1436 if (!continuation || 1437 pgets(buf, sizeof buf, pfp) == NULL) 1438 break; 1439 if (pipefp != NULL) 1440 fputs(buf, pipefp); 1441 } 1442 } else if (*t != 'd') { 1443 while (pgets(buf, buf_len, pfp) != NULL) { 1444 p_input_line++; 1445 if (pipefp != NULL) 1446 fputs(buf, pipefp); 1447 if (strEQ(buf, ".\n")) 1448 break; 1449 } 1450 } 1451 } else { 1452 next_intuit_at(beginning_of_this_line, p_input_line); 1453 break; 1454 } 1455 } 1456 if (pipefp == NULL) 1457 return; 1458 fprintf(pipefp, "w\n"); 1459 fprintf(pipefp, "q\n"); 1460 fflush(pipefp); 1461 pclose(pipefp); 1462 ignore_signals(); 1463 if (!check_only) { 1464 if (move_file(TMPOUTNAME, outname) < 0) { 1465 toutkeep = true; 1466 chmod(TMPOUTNAME, filemode); 1467 } else 1468 chmod(outname, filemode); 1469 } 1470 set_signals(1); 1471 } 1472 1473 /* 1474 * Choose the name of the file to be patched based on POSIX rules. 1475 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1476 * if the user specified --posix or set POSIXLY_CORRECT. 1477 */ 1478 static char * 1479 posix_name(const struct file_name *names, bool assume_exists) 1480 { 1481 char *path = NULL; 1482 int i; 1483 1484 /* 1485 * POSIX states that the filename will be chosen from one 1486 * of the old, new and index names (in that order) if 1487 * the file exists relative to CWD after -p stripping. 1488 */ 1489 for (i = 0; i < MAX_FILE; i++) { 1490 if (names[i].path != NULL && names[i].exists) { 1491 path = names[i].path; 1492 break; 1493 } 1494 } 1495 if (path == NULL && !assume_exists) { 1496 /* 1497 * No files found, look for something we can checkout from 1498 * RCS/SCCS dirs. Same order as above. 1499 */ 1500 for (i = 0; i < MAX_FILE; i++) { 1501 if (names[i].path != NULL && 1502 (path = checked_in(names[i].path)) != NULL) 1503 break; 1504 } 1505 /* 1506 * Still no match? Check to see if the diff could be creating 1507 * a new file. 1508 */ 1509 if (path == NULL && ok_to_create_file && 1510 names[NEW_FILE].path != NULL) 1511 path = names[NEW_FILE].path; 1512 } 1513 1514 return path ? savestr(path) : NULL; 1515 } 1516 1517 /* 1518 * Choose the name of the file to be patched based the "best" one 1519 * available. 1520 */ 1521 static char * 1522 best_name(const struct file_name *names, bool assume_exists) 1523 { 1524 size_t min_components, min_baselen, min_len, tmp; 1525 char *best = NULL; 1526 int i; 1527 1528 /* 1529 * The "best" name is the one with the fewest number of path 1530 * components, the shortest basename length, and the shortest 1531 * overall length (in that order). We only use the Index: file 1532 * if neither of the old or new files could be intuited from 1533 * the diff header. 1534 */ 1535 min_components = min_baselen = min_len = SIZE_MAX; 1536 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1537 if (names[i].path == NULL || 1538 (!names[i].exists && !assume_exists)) 1539 continue; 1540 if ((tmp = num_components(names[i].path)) > min_components) 1541 continue; 1542 min_components = tmp; 1543 if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1544 continue; 1545 min_baselen = tmp; 1546 if ((tmp = strlen(names[i].path)) > min_len) 1547 continue; 1548 min_len = tmp; 1549 best = names[i].path; 1550 } 1551 if (best == NULL) { 1552 /* 1553 * No files found, look for something we can checkout from 1554 * RCS/SCCS dirs. Logic is identical to that above... 1555 */ 1556 min_components = min_baselen = min_len = SIZE_MAX; 1557 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1558 if (names[i].path == NULL || 1559 checked_in(names[i].path) == NULL) 1560 continue; 1561 if ((tmp = num_components(names[i].path)) > min_components) 1562 continue; 1563 min_components = tmp; 1564 if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1565 continue; 1566 min_baselen = tmp; 1567 if ((tmp = strlen(names[i].path)) > min_len) 1568 continue; 1569 min_len = tmp; 1570 best = names[i].path; 1571 } 1572 /* 1573 * Still no match? Check to see if the diff could be creating 1574 * a new file. 1575 */ 1576 if (best == NULL && ok_to_create_file && 1577 names[NEW_FILE].path != NULL) 1578 best = names[NEW_FILE].path; 1579 } 1580 1581 return best ? savestr(best) : NULL; 1582 } 1583 1584 static size_t 1585 num_components(const char *path) 1586 { 1587 size_t n; 1588 const char *cp; 1589 1590 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1591 while (*cp == '/') 1592 cp++; /* skip consecutive slashes */ 1593 } 1594 return n; 1595 } 1596