pch.c revision 287223
1100280Sgordon/*- 2100280Sgordon * Copyright 1986, Larry Wall 3118638Sfjoe * 466830Sobrien * Redistribution and use in source and binary forms, with or without 566830Sobrien * modification, are permitted provided that the following condition is met: 666830Sobrien * 1. Redistributions of source code must retain the above copyright notice, 766830Sobrien * this condition and the following disclaimer. 866830Sobrien * 966830Sobrien * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 1066830Sobrien * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 1166830Sobrien * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 1266830Sobrien * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 1366830Sobrien * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1466830Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 1566830Sobrien * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 1666830Sobrien * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 1766830Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 1866830Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 1966830Sobrien * SUCH DAMAGE. 2066830Sobrien * 2166830Sobrien * patch - a program to apply diffs to original files 2266830Sobrien * 2366830Sobrien * -C option added in 1998, original code by Marc Espie, based on FreeBSD 2466830Sobrien * behaviour 2566830Sobrien * 2666830Sobrien * $OpenBSD: pch.c,v 1.43 2014/11/18 17:03:35 tobias Exp $ 2751231Ssheldonh * $FreeBSD: stable/10/usr.bin/patch/pch.c 287223 2015-08-27 21:52:09Z delphij $ 2851231Ssheldonh */ 29100280Sgordon 30100280Sgordon#include <sys/types.h> 31100280Sgordon#include <sys/stat.h> 32108191Sdillon 33108191Sdillon#include <ctype.h> 34108191Sdillon#include <libgen.h> 35108191Sdillon#include <limits.h> 36108191Sdillon#include <stdint.h> 37108191Sdillon#include <stdio.h> 38108191Sdillon#include <stdlib.h> 39108191Sdillon#include <string.h> 40108191Sdillon#include <unistd.h> 41108191Sdillon 42108191Sdillon#include "common.h" 43108191Sdillon#include "util.h" 44108191Sdillon#include "pch.h" 45108191Sdillon#include "pathnames.h" 46108191Sdillon 47108191Sdillon/* Patch (diff listing) abstract type. */ 48108191Sdillon 49108191Sdillonstatic off_t p_filesize; /* size of the patch file */ 50108191Sdillonstatic LINENUM p_first; /* 1st line number */ 51108191Sdillonstatic LINENUM p_newfirst; /* 1st line number of replacement */ 52108191Sdillonstatic LINENUM p_ptrn_lines; /* # lines in pattern */ 53108191Sdillonstatic LINENUM p_repl_lines; /* # lines in replacement text */ 54108191Sdillonstatic LINENUM p_end = -1; /* last line in hunk */ 55108191Sdillonstatic LINENUM p_max; /* max allowed value of p_end */ 56108191Sdillonstatic LINENUM p_context = 3; /* # of context lines */ 57108191Sdillonstatic LINENUM p_input_line = 0; /* current line # from patch file */ 58108191Sdillonstatic char **p_line = NULL;/* the text of the hunk */ 59108191Sdillonstatic unsigned short *p_len = NULL; /* length of each line */ 60108191Sdillonstatic char *p_char = NULL; /* +, -, and ! */ 61108191Sdillonstatic int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 62108191Sdillonstatic int p_indent; /* indent to patch */ 63108191Sdillonstatic off_t p_base; /* where to intuit this time */ 64108191Sdillonstatic LINENUM p_bline; /* line # of p_base */ 65108191Sdillonstatic off_t p_start; /* where intuit found a patch */ 66108191Sdillonstatic LINENUM p_sline; /* and the line number for it */ 67108191Sdillonstatic LINENUM p_hunk_beg; /* line number of current hunk */ 68108191Sdillonstatic LINENUM p_efake = -1; /* end of faked up lines--don't free */ 69108191Sdillonstatic LINENUM p_bfake = -1; /* beg of faked up lines */ 70108191Sdillonstatic FILE *pfp = NULL; /* patch file pointer */ 71108191Sdillonstatic char *bestguess = NULL; /* guess at correct filename */ 72108191Sdillon 73108191Sdillonstatic void grow_hunkmax(void); 74108191Sdillonstatic int intuit_diff_type(void); 75108191Sdillonstatic void next_intuit_at(off_t, LINENUM); 76108191Sdillonstatic void skip_to(off_t, LINENUM); 77108191Sdillonstatic size_t pgets(bool _do_indent); 78108191Sdillonstatic char *best_name(const struct file_name *, bool); 79108191Sdillonstatic char *posix_name(const struct file_name *, bool); 80108191Sdillonstatic size_t num_components(const char *); 81108191Sdillonstatic LINENUM strtolinenum(char *, char **); 82100280Sgordon 83100280Sgordon/* 84100280Sgordon * Prepare to look for the next patch in the patch file. 8543803Sdillon */ 8643803Sdillonvoid 8743803Sdillonre_patch(void) 8843803Sdillon{ 8943803Sdillon p_first = 0; 9043803Sdillon p_newfirst = 0; 9151231Ssheldonh p_ptrn_lines = 0; 92108191Sdillon p_repl_lines = 0; 93108191Sdillon p_end = (LINENUM) - 1; 94108191Sdillon p_max = 0; 95108191Sdillon p_indent = 0; 96108191Sdillon} 97108191Sdillon 98108191Sdillon/* 99108191Sdillon * Open the patch file at the beginning of time. 100108191Sdillon */ 101108191Sdillonvoid 10243803Sdillonopen_patch_file(const char *filename) 10343803Sdillon{ 104108191Sdillon struct stat filestat; 105108191Sdillon int nr, nw; 106108191Sdillon 107108191Sdillon if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 10875931Simp pfp = fopen(TMPPATNAME, "w"); 10975931Simp if (pfp == NULL) 110108191Sdillon pfatal("can't create %s", TMPPATNAME); 111108191Sdillon while ((nr = fread(buf, 1, buf_size, stdin)) > 0) { 112108191Sdillon nw = fwrite(buf, 1, nr, pfp); 113108191Sdillon if (nr != nw) 114110942Sjhay pfatal("write error to %s", TMPPATNAME); 115108191Sdillon } 116108191Sdillon if (ferror(pfp) || fclose(pfp)) 117108191Sdillon pfatal("can't write %s", TMPPATNAME); 118108191Sdillon filename = TMPPATNAME; 119108191Sdillon } 120108191Sdillon pfp = fopen(filename, "r"); 121108191Sdillon if (pfp == NULL) 122108191Sdillon pfatal("patch file %s not found", filename); 123108191Sdillon if (fstat(fileno(pfp), &filestat)) 124108191Sdillon pfatal("can't stat %s", filename); 12543803Sdillon p_filesize = filestat.st_size; 12643803Sdillon next_intuit_at(0, 1L); /* start at the beginning */ 12755520Sluigi set_hunkmax(); 12843803Sdillon} 12951231Ssheldonh 13043803Sdillon/* 13155520Sluigi * Make sure our dynamically realloced tables are malloced to begin with. 13255520Sluigi */ 13355520Sluigivoid 13455520Sluigiset_hunkmax(void) 13555520Sluigi{ 136108191Sdillon if (p_line == NULL) 137108191Sdillon p_line = malloc(hunkmax * sizeof(char *)); 138108191Sdillon if (p_len == NULL) 139108191Sdillon p_len = malloc(hunkmax * sizeof(unsigned short)); 140108191Sdillon if (p_char == NULL) 141108191Sdillon p_char = malloc(hunkmax * sizeof(char)); 142108191Sdillon} 143108191Sdillon 144108191Sdillon/* 145108191Sdillon * Enlarge the arrays containing the current hunk of patch. 146108191Sdillon */ 147108191Sdillonstatic void 148108191Sdillongrow_hunkmax(void) 14955520Sluigi{ 15055520Sluigi int new_hunkmax = hunkmax * 2; 15143803Sdillon 152117087Sbrooks if (p_line == NULL || p_len == NULL || p_char == NULL) 153117087Sbrooks fatal("Internal memory allocation error\n"); 154117087Sbrooks 155117087Sbrooks p_line = reallocf(p_line, new_hunkmax * sizeof(char *)); 156117087Sbrooks p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short)); 157117087Sbrooks p_char = reallocf(p_char, new_hunkmax * sizeof(char)); 158117087Sbrooks 159117087Sbrooks if (p_line != NULL && p_len != NULL && p_char != NULL) { 160117087Sbrooks hunkmax = new_hunkmax; 161117087Sbrooks return; 162117087Sbrooks } 163108191Sdillon 164108191Sdillon if (!using_plan_a) 165108191Sdillon fatal("out of memory\n"); 16643803Sdillon out_of_mem = true; /* whatever is null will be allocated again */ 167108191Sdillon /* from within plan_a(), of all places */ 168108191Sdillon} 169108191Sdillon 170108191Sdillon/* True if the remainder of the patch file contains a diff of some sort. */ 171108191Sdillon 172108191Sdillonbool 173108191Sdillonthere_is_another_patch(void) 174108191Sdillon{ 175108191Sdillon bool exists = false; 176108191Sdillon 177108191Sdillon if (p_base != 0 && p_base >= p_filesize) { 178117087Sbrooks if (verbose) 179117087Sbrooks say("done\n"); 180117087Sbrooks return false; 181117087Sbrooks } 182108191Sdillon if (verbose) 183108191Sdillon say("Hmm..."); 184108191Sdillon diff_type = intuit_diff_type(); 185108191Sdillon if (!diff_type) { 186108191Sdillon if (p_base != 0) { 187108191Sdillon if (verbose) 188108191Sdillon say(" Ignoring the trailing garbage.\ndone\n"); 189108191Sdillon } else 190108191Sdillon say(" I can't seem to find a patch in there anywhere.\n"); 19143803Sdillon return false; 192108191Sdillon } 193108191Sdillon if (verbose) 194108191Sdillon say(" %sooks like %s to me...\n", 195108191Sdillon (p_base == 0 ? "L" : "The next patch l"), 196117087Sbrooks diff_type == UNI_DIFF ? "a unified diff" : 197117087Sbrooks diff_type == CONTEXT_DIFF ? "a context diff" : 198117087Sbrooks diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 199108191Sdillon diff_type == NORMAL_DIFF ? "a normal diff" : 200108191Sdillon "an ed script"); 20175746Sbsd if (p_indent && verbose) 202108191Sdillon say("(Patch is indented %d space%s.)\n", p_indent, 20375746Sbsd p_indent == 1 ? "" : "s"); 20475746Sbsd skip_to(p_start, p_sline); 205108191Sdillon while (filearg[0] == NULL) { 206108191Sdillon if (force || batch) { 207108191Sdillon say("No file to patch. Skipping...\n"); 208108191Sdillon filearg[0] = xstrdup(bestguess); 20995280Sobrien skip_rest_of_patch = true; 210108191Sdillon return true; 211108191Sdillon } 212108191Sdillon ask("File to patch: "); 21395280Sobrien if (*buf != '\n') { 214108191Sdillon free(bestguess); 215108191Sdillon bestguess = xstrdup(buf); 216108191Sdillon filearg[0] = fetchname(buf, &exists, 0); 217108191Sdillon } 218108191Sdillon if (!exists) { 219108191Sdillon ask("No file found--skip this patch? [n] "); 220108191Sdillon if (*buf != 'y') 221108191Sdillon continue; 222108191Sdillon if (verbose) 223108191Sdillon say("Skipping patch...\n"); 224108191Sdillon free(filearg[0]); 225108191Sdillon filearg[0] = fetchname(bestguess, &exists, 0); 226108191Sdillon skip_rest_of_patch = true; 227108191Sdillon return true; 228108191Sdillon } 229108191Sdillon } 230108191Sdillon return true; 231108191Sdillon} 232108191Sdillon 233108191Sdillonstatic void 234108191Sdillonp4_fetchname(struct file_name *name, char *str) 235108191Sdillon{ 236108191Sdillon char *t, *h; 237108191Sdillon 238108191Sdillon /* Skip leading whitespace. */ 239108191Sdillon while (isspace((unsigned char)*str)) 240108191Sdillon str++; 241104334Sdd 242 /* Remove the file revision number. */ 243 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 244 if (*t == '#') 245 h = t; 246 if (h != NULL) 247 *h = '\0'; 248 249 name->path = fetchname(str, &name->exists, strippath); 250} 251 252/* Determine what kind of diff is in the remaining part of the patch file. */ 253 254static int 255intuit_diff_type(void) 256{ 257 off_t this_line = 0, previous_line; 258 off_t first_command_line = -1; 259 LINENUM fcl_line = -1; 260 bool last_line_was_command = false, this_is_a_command = false; 261 bool stars_last_line = false, stars_this_line = false; 262 char *s, *t; 263 int indent, retval; 264 struct file_name names[MAX_FILE]; 265 266 memset(names, 0, sizeof(names)); 267 ok_to_create_file = false; 268 fseeko(pfp, p_base, SEEK_SET); 269 p_input_line = p_bline - 1; 270 for (;;) { 271 previous_line = this_line; 272 last_line_was_command = this_is_a_command; 273 stars_last_line = stars_this_line; 274 this_line = ftello(pfp); 275 indent = 0; 276 p_input_line++; 277 if (pgets(false) == 0) { 278 if (first_command_line >= 0) { 279 /* nothing but deletes!? */ 280 p_start = first_command_line; 281 p_sline = fcl_line; 282 retval = ED_DIFF; 283 goto scan_exit; 284 } else { 285 p_start = this_line; 286 p_sline = p_input_line; 287 retval = 0; 288 goto scan_exit; 289 } 290 } 291 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 292 if (*s == '\t') 293 indent += 8 - (indent % 8); 294 else 295 indent++; 296 } 297 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 298 ; 299 this_is_a_command = (isdigit((unsigned char)*s) && 300 (*t == 'd' || *t == 'c' || *t == 'a')); 301 if (first_command_line < 0 && this_is_a_command) { 302 first_command_line = this_line; 303 fcl_line = p_input_line; 304 p_indent = indent; /* assume this for now */ 305 } 306 if (!stars_last_line && strnEQ(s, "*** ", 4)) 307 names[OLD_FILE].path = fetchname(s + 4, 308 &names[OLD_FILE].exists, strippath); 309 else if (strnEQ(s, "--- ", 4)) 310 names[NEW_FILE].path = fetchname(s + 4, 311 &names[NEW_FILE].exists, strippath); 312 else if (strnEQ(s, "+++ ", 4)) 313 /* pretend it is the old name */ 314 names[OLD_FILE].path = fetchname(s + 4, 315 &names[OLD_FILE].exists, strippath); 316 else if (strnEQ(s, "Index:", 6)) 317 names[INDEX_FILE].path = fetchname(s + 6, 318 &names[INDEX_FILE].exists, strippath); 319 else if (strnEQ(s, "Prereq:", 7)) { 320 for (t = s + 7; isspace((unsigned char)*t); t++) 321 ; 322 revision = xstrdup(t); 323 for (t = revision; 324 *t && !isspace((unsigned char)*t); t++) 325 ; 326 *t = '\0'; 327 if (*revision == '\0') { 328 free(revision); 329 revision = NULL; 330 } 331 } else if (strnEQ(s, "==== ", 5)) { 332 /* Perforce-style diffs. */ 333 if ((t = strstr(s + 5, " - ")) != NULL) 334 p4_fetchname(&names[NEW_FILE], t + 3); 335 p4_fetchname(&names[OLD_FILE], s + 5); 336 } 337 if ((!diff_type || diff_type == ED_DIFF) && 338 first_command_line >= 0 && 339 strEQ(s, ".\n")) { 340 p_indent = indent; 341 p_start = first_command_line; 342 p_sline = fcl_line; 343 retval = ED_DIFF; 344 goto scan_exit; 345 } 346 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 347 if (strnEQ(s + 4, "0,0", 3)) 348 ok_to_create_file = true; 349 p_indent = indent; 350 p_start = this_line; 351 p_sline = p_input_line; 352 retval = UNI_DIFF; 353 goto scan_exit; 354 } 355 stars_this_line = strnEQ(s, "********", 8); 356 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 357 strnEQ(s, "*** ", 4)) { 358 if (strtolinenum(s + 4, &s) == 0) 359 ok_to_create_file = true; 360 /* 361 * If this is a new context diff the character just 362 * at the end of the line is a '*'. 363 */ 364 while (*s && *s != '\n') 365 s++; 366 p_indent = indent; 367 p_start = previous_line; 368 p_sline = p_input_line - 1; 369 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 370 goto scan_exit; 371 } 372 if ((!diff_type || diff_type == NORMAL_DIFF) && 373 last_line_was_command && 374 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 375 p_start = previous_line; 376 p_sline = p_input_line - 1; 377 p_indent = indent; 378 retval = NORMAL_DIFF; 379 goto scan_exit; 380 } 381 } 382scan_exit: 383 if (retval == UNI_DIFF) { 384 /* unswap old and new */ 385 struct file_name tmp = names[OLD_FILE]; 386 names[OLD_FILE] = names[NEW_FILE]; 387 names[NEW_FILE] = tmp; 388 } 389 if (filearg[0] == NULL) { 390 if (posix) 391 filearg[0] = posix_name(names, ok_to_create_file); 392 else { 393 /* Ignore the Index: name for context diffs, like GNU */ 394 if (names[OLD_FILE].path != NULL || 395 names[NEW_FILE].path != NULL) { 396 free(names[INDEX_FILE].path); 397 names[INDEX_FILE].path = NULL; 398 } 399 filearg[0] = best_name(names, ok_to_create_file); 400 } 401 } 402 403 free(bestguess); 404 bestguess = NULL; 405 if (filearg[0] != NULL) 406 bestguess = xstrdup(filearg[0]); 407 else if (!ok_to_create_file) { 408 /* 409 * We don't want to create a new file but we need a 410 * filename to set bestguess. Avoid setting filearg[0] 411 * so the file is not created automatically. 412 */ 413 if (posix) 414 bestguess = posix_name(names, true); 415 else 416 bestguess = best_name(names, true); 417 } 418 free(names[OLD_FILE].path); 419 free(names[NEW_FILE].path); 420 free(names[INDEX_FILE].path); 421 return retval; 422} 423 424/* 425 * Remember where this patch ends so we know where to start up again. 426 */ 427static void 428next_intuit_at(off_t file_pos, LINENUM file_line) 429{ 430 p_base = file_pos; 431 p_bline = file_line; 432} 433 434/* 435 * Basically a verbose fseeko() to the actual diff listing. 436 */ 437static void 438skip_to(off_t file_pos, LINENUM file_line) 439{ 440 size_t len; 441 442 if (p_base > file_pos) 443 fatal("Internal error: seek %lld>%lld\n", 444 (long long)p_base, (long long)file_pos); 445 if (verbose && p_base < file_pos) { 446 fseeko(pfp, p_base, SEEK_SET); 447 say("The text leading up to this was:\n--------------------------\n"); 448 while (ftello(pfp) < file_pos) { 449 len = pgets(false); 450 if (len == 0) 451 fatal("Unexpected end of file\n"); 452 say("|%s", buf); 453 } 454 say("--------------------------\n"); 455 } else 456 fseeko(pfp, file_pos, SEEK_SET); 457 p_input_line = file_line - 1; 458} 459 460/* Make this a function for better debugging. */ 461static void 462malformed(void) 463{ 464 fatal("malformed patch at line %ld: %s", p_input_line, buf); 465 /* about as informative as "Syntax error" in C */ 466} 467 468/* 469 * True if the line has been discarded (i.e. it is a line saying 470 * "\ No newline at end of file".) 471 */ 472static bool 473remove_special_line(void) 474{ 475 int c; 476 477 c = fgetc(pfp); 478 if (c == '\\') { 479 do { 480 c = fgetc(pfp); 481 } while (c != EOF && c != '\n'); 482 483 return true; 484 } 485 if (c != EOF) 486 fseeko(pfp, -1, SEEK_CUR); 487 488 return false; 489} 490 491/* 492 * True if there is more of the current diff listing to process. 493 */ 494bool 495another_hunk(void) 496{ 497 off_t line_beginning; /* file pos of the current line */ 498 LINENUM repl_beginning; /* index of --- line */ 499 LINENUM fillcnt; /* #lines of missing ptrn or repl */ 500 LINENUM fillsrc; /* index of first line to copy */ 501 LINENUM filldst; /* index of first missing line */ 502 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 503 bool repl_could_be_missing; /* no + or ! lines in this hunk */ 504 bool repl_missing; /* we are now backtracking */ 505 off_t repl_backtrack_position; /* file pos of first repl line */ 506 LINENUM repl_patch_line; /* input line number for same */ 507 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 508 char *s; 509 size_t len; 510 int context = 0; 511 512 while (p_end >= 0) { 513 if (p_end == p_efake) 514 p_end = p_bfake; /* don't free twice */ 515 else 516 free(p_line[p_end]); 517 p_end--; 518 } 519 p_efake = -1; 520 521 p_max = hunkmax; /* gets reduced when --- found */ 522 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 523 line_beginning = ftello(pfp); 524 repl_beginning = 0; 525 fillcnt = 0; 526 fillsrc = 0; 527 filldst = 0; 528 ptrn_spaces_eaten = false; 529 repl_could_be_missing = true; 530 repl_missing = false; 531 repl_backtrack_position = 0; 532 repl_patch_line = 0; 533 ptrn_copiable = 0; 534 535 len = pgets(true); 536 p_input_line++; 537 if (len == 0 || strnNE(buf, "********", 8)) { 538 next_intuit_at(line_beginning, p_input_line); 539 return false; 540 } 541 p_context = 100; 542 p_hunk_beg = p_input_line + 1; 543 while (p_end < p_max) { 544 line_beginning = ftello(pfp); 545 len = pgets(true); 546 p_input_line++; 547 if (len == 0) { 548 if (p_max - p_end < 4) { 549 /* assume blank lines got chopped */ 550 strlcpy(buf, " \n", buf_size); 551 } else { 552 if (repl_beginning && repl_could_be_missing) { 553 repl_missing = true; 554 goto hunk_done; 555 } 556 fatal("unexpected end of file in patch\n"); 557 } 558 } 559 p_end++; 560 if (p_end >= hunkmax) 561 fatal("Internal error: hunk larger than hunk " 562 "buffer size"); 563 p_char[p_end] = *buf; 564 p_line[p_end] = NULL; 565 switch (*buf) { 566 case '*': 567 if (strnEQ(buf, "********", 8)) { 568 if (repl_beginning && repl_could_be_missing) { 569 repl_missing = true; 570 goto hunk_done; 571 } else 572 fatal("unexpected end of hunk " 573 "at line %ld\n", 574 p_input_line); 575 } 576 if (p_end != 0) { 577 if (repl_beginning && repl_could_be_missing) { 578 repl_missing = true; 579 goto hunk_done; 580 } 581 fatal("unexpected *** at line %ld: %s", 582 p_input_line, buf); 583 } 584 context = 0; 585 p_line[p_end] = savestr(buf); 586 if (out_of_mem) { 587 p_end--; 588 return false; 589 } 590 for (s = buf; 591 *s && !isdigit((unsigned char)*s); s++) 592 ; 593 if (!*s) 594 malformed(); 595 if (strnEQ(s, "0,0", 3)) 596 memmove(s, s + 2, strlen(s + 2) + 1); 597 p_first = strtolinenum(s, &s); 598 if (*s == ',') { 599 for (; 600 *s && !isdigit((unsigned char)*s); s++) 601 ; 602 if (!*s) 603 malformed(); 604 p_ptrn_lines = strtolinenum(s, &s) - p_first + 1; 605 if (p_ptrn_lines < 0) 606 malformed(); 607 } else if (p_first) 608 p_ptrn_lines = 1; 609 else { 610 p_ptrn_lines = 0; 611 p_first = 1; 612 } 613 if (p_first >= LINENUM_MAX - p_ptrn_lines || 614 p_ptrn_lines >= LINENUM_MAX - 6) 615 malformed(); 616 617 /* we need this much at least */ 618 p_max = p_ptrn_lines + 6; 619 while (p_max >= hunkmax) 620 grow_hunkmax(); 621 p_max = hunkmax; 622 break; 623 case '-': 624 if (buf[1] == '-') { 625 if (repl_beginning || 626 (p_end != p_ptrn_lines + 1 + 627 (p_char[p_end - 1] == '\n'))) { 628 if (p_end == 1) { 629 /* 630 * `old' lines were omitted; 631 * set up to fill them in 632 * from 'new' context lines. 633 */ 634 p_end = p_ptrn_lines + 1; 635 fillsrc = p_end + 1; 636 filldst = 1; 637 fillcnt = p_ptrn_lines; 638 } else { 639 if (repl_beginning) { 640 if (repl_could_be_missing) { 641 repl_missing = true; 642 goto hunk_done; 643 } 644 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 645 p_input_line, p_hunk_beg + repl_beginning); 646 } else { 647 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 648 (p_end <= p_ptrn_lines 649 ? "Premature" 650 : "Overdue"), 651 p_input_line, p_hunk_beg); 652 } 653 } 654 } 655 repl_beginning = p_end; 656 repl_backtrack_position = ftello(pfp); 657 repl_patch_line = p_input_line; 658 p_line[p_end] = savestr(buf); 659 if (out_of_mem) { 660 p_end--; 661 return false; 662 } 663 p_char[p_end] = '='; 664 for (s = buf; *s && !isdigit((unsigned char)*s); s++) 665 ; 666 if (!*s) 667 malformed(); 668 p_newfirst = strtolinenum(s, &s); 669 if (*s == ',') { 670 for (; *s && !isdigit((unsigned char)*s); s++) 671 ; 672 if (!*s) 673 malformed(); 674 p_repl_lines = strtolinenum(s, &s) - 675 p_newfirst + 1; 676 if (p_repl_lines < 0) 677 malformed(); 678 } else if (p_newfirst) 679 p_repl_lines = 1; 680 else { 681 p_repl_lines = 0; 682 p_newfirst = 1; 683 } 684 if (p_newfirst >= LINENUM_MAX - p_repl_lines || 685 p_repl_lines >= LINENUM_MAX - p_end) 686 malformed(); 687 p_max = p_repl_lines + p_end; 688 if (p_max > MAXHUNKSIZE) 689 fatal("hunk too large (%ld lines) at line %ld: %s", 690 p_max, p_input_line, buf); 691 while (p_max >= hunkmax) 692 grow_hunkmax(); 693 if (p_repl_lines != ptrn_copiable && 694 (p_context != 0 || p_repl_lines != 1)) 695 repl_could_be_missing = false; 696 break; 697 } 698 goto change_line; 699 case '+': 700 case '!': 701 repl_could_be_missing = false; 702 change_line: 703 if (buf[1] == '\n' && canonicalize) 704 strlcpy(buf + 1, " \n", buf_size - 1); 705 if (!isspace((unsigned char)buf[1]) && 706 buf[1] != '>' && buf[1] != '<' && 707 repl_beginning && repl_could_be_missing) { 708 repl_missing = true; 709 goto hunk_done; 710 } 711 if (context >= 0) { 712 if (context < p_context) 713 p_context = context; 714 context = -1000; 715 } 716 p_line[p_end] = savestr(buf + 2); 717 if (out_of_mem) { 718 p_end--; 719 return false; 720 } 721 if (p_end == p_ptrn_lines) { 722 if (remove_special_line()) { 723 int l; 724 725 l = strlen(p_line[p_end]) - 1; 726 (p_line[p_end])[l] = 0; 727 } 728 } 729 break; 730 case '\t': 731 case '\n': /* assume the 2 spaces got eaten */ 732 if (repl_beginning && repl_could_be_missing && 733 (!ptrn_spaces_eaten || 734 diff_type == NEW_CONTEXT_DIFF)) { 735 repl_missing = true; 736 goto hunk_done; 737 } 738 p_line[p_end] = savestr(buf); 739 if (out_of_mem) { 740 p_end--; 741 return false; 742 } 743 if (p_end != p_ptrn_lines + 1) { 744 ptrn_spaces_eaten |= (repl_beginning != 0); 745 context++; 746 if (!repl_beginning) 747 ptrn_copiable++; 748 p_char[p_end] = ' '; 749 } 750 break; 751 case ' ': 752 if (!isspace((unsigned char)buf[1]) && 753 repl_beginning && repl_could_be_missing) { 754 repl_missing = true; 755 goto hunk_done; 756 } 757 context++; 758 if (!repl_beginning) 759 ptrn_copiable++; 760 p_line[p_end] = savestr(buf + 2); 761 if (out_of_mem) { 762 p_end--; 763 return false; 764 } 765 break; 766 default: 767 if (repl_beginning && repl_could_be_missing) { 768 repl_missing = true; 769 goto hunk_done; 770 } 771 malformed(); 772 } 773 /* set up p_len for strncmp() so we don't have to */ 774 /* assume null termination */ 775 if (p_line[p_end]) 776 p_len[p_end] = strlen(p_line[p_end]); 777 else 778 p_len[p_end] = 0; 779 } 780 781hunk_done: 782 if (p_end >= 0 && !repl_beginning) 783 fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 784 785 if (repl_missing) { 786 787 /* reset state back to just after --- */ 788 p_input_line = repl_patch_line; 789 for (p_end--; p_end > repl_beginning; p_end--) 790 free(p_line[p_end]); 791 fseeko(pfp, repl_backtrack_position, SEEK_SET); 792 793 /* redundant 'new' context lines were omitted - set */ 794 /* up to fill them in from the old file context */ 795 if (!p_context && p_repl_lines == 1) { 796 p_repl_lines = 0; 797 p_max--; 798 } 799 fillsrc = 1; 800 filldst = repl_beginning + 1; 801 fillcnt = p_repl_lines; 802 p_end = p_max; 803 } else if (!p_context && fillcnt == 1) { 804 /* the first hunk was a null hunk with no context */ 805 /* and we were expecting one line -- fix it up. */ 806 while (filldst < p_end) { 807 p_line[filldst] = p_line[filldst + 1]; 808 p_char[filldst] = p_char[filldst + 1]; 809 p_len[filldst] = p_len[filldst + 1]; 810 filldst++; 811 } 812#if 0 813 repl_beginning--; /* this doesn't need to be fixed */ 814#endif 815 p_end--; 816 p_first++; /* do append rather than insert */ 817 fillcnt = 0; 818 p_ptrn_lines = 0; 819 } 820 if (diff_type == CONTEXT_DIFF && 821 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 822 if (verbose) 823 say("%s\n%s\n%s\n", 824 "(Fascinating--this is really a new-style context diff but without", 825 "the telltale extra asterisks on the *** line that usually indicate", 826 "the new style...)"); 827 diff_type = NEW_CONTEXT_DIFF; 828 } 829 /* if there were omitted context lines, fill them in now */ 830 if (fillcnt) { 831 p_bfake = filldst; /* remember where not to free() */ 832 p_efake = filldst + fillcnt - 1; 833 while (fillcnt-- > 0) { 834 while (fillsrc <= p_end && p_char[fillsrc] != ' ') 835 fillsrc++; 836 if (fillsrc > p_end) 837 fatal("replacement text or line numbers mangled in hunk at line %ld\n", 838 p_hunk_beg); 839 p_line[filldst] = p_line[fillsrc]; 840 p_char[filldst] = p_char[fillsrc]; 841 p_len[filldst] = p_len[fillsrc]; 842 fillsrc++; 843 filldst++; 844 } 845 while (fillsrc <= p_end && fillsrc != repl_beginning && 846 p_char[fillsrc] != ' ') 847 fillsrc++; 848#ifdef DEBUGGING 849 if (debug & 64) 850 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 851 fillsrc, filldst, repl_beginning, p_end + 1); 852#endif 853 if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 854 malformed(); 855 if (filldst != p_end + 1 && filldst != repl_beginning) 856 malformed(); 857 } 858 if (p_line[p_end] != NULL) { 859 if (remove_special_line()) { 860 p_len[p_end] -= 1; 861 (p_line[p_end])[p_len[p_end]] = 0; 862 } 863 } 864 } else if (diff_type == UNI_DIFF) { 865 LINENUM fillold; /* index of old lines */ 866 LINENUM fillnew; /* index of new lines */ 867 char ch; 868 869 line_beginning = ftello(pfp); /* file pos of the current line */ 870 len = pgets(true); 871 p_input_line++; 872 if (len == 0 || strnNE(buf, "@@ -", 4)) { 873 next_intuit_at(line_beginning, p_input_line); 874 return false; 875 } 876 s = buf + 4; 877 if (!*s) 878 malformed(); 879 p_first = strtolinenum(s, &s); 880 if (*s == ',') { 881 p_ptrn_lines = strtolinenum(s + 1, &s); 882 } else 883 p_ptrn_lines = 1; 884 if (*s == ' ') 885 s++; 886 if (*s != '+' || !*++s) 887 malformed(); 888 p_newfirst = strtolinenum(s, &s); 889 if (*s == ',') { 890 p_repl_lines = strtolinenum(s + 1, &s); 891 } else 892 p_repl_lines = 1; 893 if (*s == ' ') 894 s++; 895 if (*s != '@') 896 malformed(); 897 if (p_first >= LINENUM_MAX - p_ptrn_lines || 898 p_newfirst > LINENUM_MAX - p_repl_lines || 899 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 900 malformed(); 901 if (!p_ptrn_lines) 902 p_first++; /* do append rather than insert */ 903 p_max = p_ptrn_lines + p_repl_lines + 1; 904 while (p_max >= hunkmax) 905 grow_hunkmax(); 906 fillold = 1; 907 fillnew = fillold + p_ptrn_lines; 908 p_end = fillnew + p_repl_lines; 909 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 910 p_first + p_ptrn_lines - 1); 911 p_line[0] = savestr(buf); 912 if (out_of_mem) { 913 p_end = -1; 914 return false; 915 } 916 p_char[0] = '*'; 917 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 918 p_newfirst + p_repl_lines - 1); 919 p_line[fillnew] = savestr(buf); 920 if (out_of_mem) { 921 p_end = 0; 922 return false; 923 } 924 p_char[fillnew++] = '='; 925 p_context = 100; 926 context = 0; 927 p_hunk_beg = p_input_line + 1; 928 while (fillold <= p_ptrn_lines || fillnew <= p_end) { 929 line_beginning = ftello(pfp); 930 len = pgets(true); 931 p_input_line++; 932 if (len == 0) { 933 if (p_max - fillnew < 3) { 934 /* assume blank lines got chopped */ 935 strlcpy(buf, " \n", buf_size); 936 } else { 937 fatal("unexpected end of file in patch\n"); 938 } 939 } 940 if (*buf == '\t' || *buf == '\n') { 941 ch = ' '; /* assume the space got eaten */ 942 s = savestr(buf); 943 } else { 944 ch = *buf; 945 s = savestr(buf + 1); 946 } 947 if (out_of_mem) { 948 while (--fillnew > p_ptrn_lines) 949 free(p_line[fillnew]); 950 p_end = fillold - 1; 951 return false; 952 } 953 switch (ch) { 954 case '-': 955 if (fillold > p_ptrn_lines) { 956 free(s); 957 p_end = fillnew - 1; 958 malformed(); 959 } 960 p_char[fillold] = ch; 961 p_line[fillold] = s; 962 p_len[fillold++] = strlen(s); 963 if (fillold > p_ptrn_lines) { 964 if (remove_special_line()) { 965 p_len[fillold - 1] -= 1; 966 s[p_len[fillold - 1]] = 0; 967 } 968 } 969 break; 970 case '=': 971 ch = ' '; 972 /* FALL THROUGH */ 973 case ' ': 974 if (fillold > p_ptrn_lines) { 975 free(s); 976 while (--fillnew > p_ptrn_lines) 977 free(p_line[fillnew]); 978 p_end = fillold - 1; 979 malformed(); 980 } 981 context++; 982 p_char[fillold] = ch; 983 p_line[fillold] = s; 984 p_len[fillold++] = strlen(s); 985 s = savestr(s); 986 if (out_of_mem) { 987 while (--fillnew > p_ptrn_lines) 988 free(p_line[fillnew]); 989 p_end = fillold - 1; 990 return false; 991 } 992 if (fillold > p_ptrn_lines) { 993 if (remove_special_line()) { 994 p_len[fillold - 1] -= 1; 995 s[p_len[fillold - 1]] = 0; 996 } 997 } 998 /* FALL THROUGH */ 999 case '+': 1000 if (fillnew > p_end) { 1001 free(s); 1002 while (--fillnew > p_ptrn_lines) 1003 free(p_line[fillnew]); 1004 p_end = fillold - 1; 1005 malformed(); 1006 } 1007 p_char[fillnew] = ch; 1008 p_line[fillnew] = s; 1009 p_len[fillnew++] = strlen(s); 1010 if (fillold > p_ptrn_lines) { 1011 if (remove_special_line()) { 1012 p_len[fillnew - 1] -= 1; 1013 s[p_len[fillnew - 1]] = 0; 1014 } 1015 } 1016 break; 1017 default: 1018 p_end = fillnew; 1019 malformed(); 1020 } 1021 if (ch != ' ' && context > 0) { 1022 if (context < p_context) 1023 p_context = context; 1024 context = -1000; 1025 } 1026 } /* while */ 1027 } else { /* normal diff--fake it up */ 1028 char hunk_type; 1029 int i; 1030 LINENUM min, max; 1031 1032 line_beginning = ftello(pfp); 1033 p_context = 0; 1034 len = pgets(true); 1035 p_input_line++; 1036 if (len == 0 || !isdigit((unsigned char)*buf)) { 1037 next_intuit_at(line_beginning, p_input_line); 1038 return false; 1039 } 1040 p_first = strtolinenum(buf, &s); 1041 if (*s == ',') { 1042 p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1; 1043 if (p_ptrn_lines < 0) 1044 malformed(); 1045 } else 1046 p_ptrn_lines = (*s != 'a'); 1047 hunk_type = *s; 1048 if (hunk_type == 'a') 1049 p_first++; /* do append rather than insert */ 1050 min = strtolinenum(s + 1, &s); 1051 if (*s == ',') 1052 max = strtolinenum(s + 1, &s); 1053 else 1054 max = min; 1055 if (min < 0 || min > max || max - min == LINENUM_MAX) 1056 malformed(); 1057 if (hunk_type == 'd') 1058 min++; 1059 p_newfirst = min; 1060 p_repl_lines = max - min + 1; 1061 if (p_newfirst > LINENUM_MAX - p_repl_lines || 1062 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1063 malformed(); 1064 p_end = p_ptrn_lines + p_repl_lines + 1; 1065 if (p_end > MAXHUNKSIZE) 1066 fatal("hunk too large (%ld lines) at line %ld: %s", 1067 p_end, p_input_line, buf); 1068 while (p_end >= hunkmax) 1069 grow_hunkmax(); 1070 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1071 p_first + p_ptrn_lines - 1); 1072 p_line[0] = savestr(buf); 1073 if (out_of_mem) { 1074 p_end = -1; 1075 return false; 1076 } 1077 p_char[0] = '*'; 1078 for (i = 1; i <= p_ptrn_lines; i++) { 1079 len = pgets(true); 1080 p_input_line++; 1081 if (len == 0) 1082 fatal("unexpected end of file in patch at line %ld\n", 1083 p_input_line); 1084 if (*buf != '<') 1085 fatal("< expected at line %ld of patch\n", 1086 p_input_line); 1087 p_line[i] = savestr(buf + 2); 1088 if (out_of_mem) { 1089 p_end = i - 1; 1090 return false; 1091 } 1092 p_len[i] = strlen(p_line[i]); 1093 p_char[i] = '-'; 1094 } 1095 1096 if (remove_special_line()) { 1097 p_len[i - 1] -= 1; 1098 (p_line[i - 1])[p_len[i - 1]] = 0; 1099 } 1100 if (hunk_type == 'c') { 1101 len = pgets(true); 1102 p_input_line++; 1103 if (len == 0) 1104 fatal("unexpected end of file in patch at line %ld\n", 1105 p_input_line); 1106 if (*buf != '-') 1107 fatal("--- expected at line %ld of patch\n", 1108 p_input_line); 1109 } 1110 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1111 p_line[i] = savestr(buf); 1112 if (out_of_mem) { 1113 p_end = i - 1; 1114 return false; 1115 } 1116 p_char[i] = '='; 1117 for (i++; i <= p_end; i++) { 1118 len = pgets(true); 1119 p_input_line++; 1120 if (len == 0) 1121 fatal("unexpected end of file in patch at line %ld\n", 1122 p_input_line); 1123 if (*buf != '>') 1124 fatal("> expected at line %ld of patch\n", 1125 p_input_line); 1126 p_line[i] = savestr(buf + 2); 1127 if (out_of_mem) { 1128 p_end = i - 1; 1129 return false; 1130 } 1131 p_len[i] = strlen(p_line[i]); 1132 p_char[i] = '+'; 1133 } 1134 1135 if (remove_special_line()) { 1136 p_len[i - 1] -= 1; 1137 (p_line[i - 1])[p_len[i - 1]] = 0; 1138 } 1139 } 1140 if (reverse) /* backwards patch? */ 1141 if (!pch_swap()) 1142 say("Not enough memory to swap next hunk!\n"); 1143#ifdef DEBUGGING 1144 if (debug & 2) { 1145 int i; 1146 char special; 1147 1148 for (i = 0; i <= p_end; i++) { 1149 if (i == p_ptrn_lines) 1150 special = '^'; 1151 else 1152 special = ' '; 1153 fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1154 special, p_line[i]); 1155 fflush(stderr); 1156 } 1157 } 1158#endif 1159 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1160 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1161 return true; 1162} 1163 1164/* 1165 * Input a line from the patch file. 1166 * Worry about indentation if do_indent is true. 1167 * The line is read directly into the buf global variable which 1168 * is resized if necessary in order to hold the complete line. 1169 * Returns the number of characters read including the terminating 1170 * '\n', if any. 1171 */ 1172size_t 1173pgets(bool do_indent) 1174{ 1175 char *line; 1176 size_t len; 1177 int indent = 0, skipped = 0; 1178 1179 line = fgetln(pfp, &len); 1180 if (line != NULL) { 1181 if (len + 1 > buf_size) { 1182 while (len + 1 > buf_size) 1183 buf_size *= 2; 1184 free(buf); 1185 buf = malloc(buf_size); 1186 if (buf == NULL) 1187 fatal("out of memory\n"); 1188 } 1189 if (do_indent == 1 && p_indent) { 1190 for (; 1191 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1192 line++, skipped++) { 1193 if (*line == '\t') 1194 indent += 8 - (indent %7); 1195 else 1196 indent++; 1197 } 1198 } 1199 memcpy(buf, line, len - skipped); 1200 buf[len - skipped] = '\0'; 1201 } 1202 return len; 1203} 1204 1205 1206/* 1207 * Reverse the old and new portions of the current hunk. 1208 */ 1209bool 1210pch_swap(void) 1211{ 1212 char **tp_line; /* the text of the hunk */ 1213 unsigned short *tp_len;/* length of each line */ 1214 char *tp_char; /* +, -, and ! */ 1215 LINENUM i; 1216 LINENUM n; 1217 bool blankline = false; 1218 char *s; 1219 1220 i = p_first; 1221 p_first = p_newfirst; 1222 p_newfirst = i; 1223 1224 /* make a scratch copy */ 1225 1226 tp_line = p_line; 1227 tp_len = p_len; 1228 tp_char = p_char; 1229 p_line = NULL; /* force set_hunkmax to allocate again */ 1230 p_len = NULL; 1231 p_char = NULL; 1232 set_hunkmax(); 1233 if (p_line == NULL || p_len == NULL || p_char == NULL) { 1234 1235 free(p_line); 1236 p_line = tp_line; 1237 free(p_len); 1238 p_len = tp_len; 1239 free(p_char); 1240 p_char = tp_char; 1241 return false; /* not enough memory to swap hunk! */ 1242 } 1243 /* now turn the new into the old */ 1244 1245 i = p_ptrn_lines + 1; 1246 if (tp_char[i] == '\n') { /* account for possible blank line */ 1247 blankline = true; 1248 i++; 1249 } 1250 if (p_efake >= 0) { /* fix non-freeable ptr range */ 1251 if (p_efake <= i) 1252 n = p_end - i + 1; 1253 else 1254 n = -i; 1255 p_efake += n; 1256 p_bfake += n; 1257 } 1258 for (n = 0; i <= p_end; i++, n++) { 1259 p_line[n] = tp_line[i]; 1260 p_char[n] = tp_char[i]; 1261 if (p_char[n] == '+') 1262 p_char[n] = '-'; 1263 p_len[n] = tp_len[i]; 1264 } 1265 if (blankline) { 1266 i = p_ptrn_lines + 1; 1267 p_line[n] = tp_line[i]; 1268 p_char[n] = tp_char[i]; 1269 p_len[n] = tp_len[i]; 1270 n++; 1271 } 1272 if (p_char[0] != '=') 1273 fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1274 p_input_line, p_char[0]); 1275 p_char[0] = '*'; 1276 for (s = p_line[0]; *s; s++) 1277 if (*s == '-') 1278 *s = '*'; 1279 1280 /* now turn the old into the new */ 1281 1282 if (p_char[0] != '*') 1283 fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1284 p_input_line, p_char[0]); 1285 tp_char[0] = '='; 1286 for (s = tp_line[0]; *s; s++) 1287 if (*s == '*') 1288 *s = '-'; 1289 for (i = 0; n <= p_end; i++, n++) { 1290 p_line[n] = tp_line[i]; 1291 p_char[n] = tp_char[i]; 1292 if (p_char[n] == '-') 1293 p_char[n] = '+'; 1294 p_len[n] = tp_len[i]; 1295 } 1296 1297 if (i != p_ptrn_lines + 1) 1298 fatal("Malformed patch at line %ld: expected %ld lines, " 1299 "got %ld\n", 1300 p_input_line, p_ptrn_lines + 1, i); 1301 1302 i = p_ptrn_lines; 1303 p_ptrn_lines = p_repl_lines; 1304 p_repl_lines = i; 1305 1306 free(tp_line); 1307 free(tp_len); 1308 free(tp_char); 1309 1310 return true; 1311} 1312 1313/* 1314 * Return the specified line position in the old file of the old context. 1315 */ 1316LINENUM 1317pch_first(void) 1318{ 1319 return p_first; 1320} 1321 1322/* 1323 * Return the number of lines of old context. 1324 */ 1325LINENUM 1326pch_ptrn_lines(void) 1327{ 1328 return p_ptrn_lines; 1329} 1330 1331/* 1332 * Return the probable line position in the new file of the first line. 1333 */ 1334LINENUM 1335pch_newfirst(void) 1336{ 1337 return p_newfirst; 1338} 1339 1340/* 1341 * Return the number of lines in the replacement text including context. 1342 */ 1343LINENUM 1344pch_repl_lines(void) 1345{ 1346 return p_repl_lines; 1347} 1348 1349/* 1350 * Return the number of lines in the whole hunk. 1351 */ 1352LINENUM 1353pch_end(void) 1354{ 1355 return p_end; 1356} 1357 1358/* 1359 * Return the number of context lines before the first changed line. 1360 */ 1361LINENUM 1362pch_context(void) 1363{ 1364 return p_context; 1365} 1366 1367/* 1368 * Return the length of a particular patch line. 1369 */ 1370unsigned short 1371pch_line_len(LINENUM line) 1372{ 1373 return p_len[line]; 1374} 1375 1376/* 1377 * Return the control character (+, -, *, !, etc) for a patch line. 1378 */ 1379char 1380pch_char(LINENUM line) 1381{ 1382 return p_char[line]; 1383} 1384 1385/* 1386 * Return a pointer to a particular patch line. 1387 */ 1388char * 1389pfetch(LINENUM line) 1390{ 1391 return p_line[line]; 1392} 1393 1394/* 1395 * Return where in the patch file this hunk began, for error messages. 1396 */ 1397LINENUM 1398pch_hunk_beg(void) 1399{ 1400 return p_hunk_beg; 1401} 1402 1403/* 1404 * Apply an ed script by feeding ed itself. 1405 */ 1406void 1407do_ed_script(void) 1408{ 1409 char *t; 1410 off_t beginning_of_this_line; 1411 FILE *pipefp = NULL; 1412 int continuation; 1413 1414 if (!skip_rest_of_patch) { 1415 if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1416 unlink(TMPOUTNAME); 1417 fatal("can't create temp file %s", TMPOUTNAME); 1418 } 1419 snprintf(buf, buf_size, "%s%s%s", _PATH_RED, 1420 verbose ? " " : " -s ", TMPOUTNAME); 1421 pipefp = popen(buf, "w"); 1422 } 1423 for (;;) { 1424 beginning_of_this_line = ftello(pfp); 1425 if (pgets(true) == 0) { 1426 next_intuit_at(beginning_of_this_line, p_input_line); 1427 break; 1428 } 1429 p_input_line++; 1430 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1431 ; 1432 /* POSIX defines allowed commands as {a,c,d,i,s} */ 1433 if (isdigit((unsigned char)*buf) && 1434 (*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) { 1435 if (pipefp != NULL) 1436 fputs(buf, pipefp); 1437 if (*t == 's') { 1438 for (;;) { 1439 continuation = 0; 1440 t = strchr(buf, '\0') - 1; 1441 while (--t >= buf && *t == '\\') 1442 continuation = !continuation; 1443 if (!continuation || 1444 pgets(true) == 0) 1445 break; 1446 if (pipefp != NULL) 1447 fputs(buf, pipefp); 1448 } 1449 } else if (*t != 'd') { 1450 while (pgets(true)) { 1451 p_input_line++; 1452 if (pipefp != NULL) 1453 fputs(buf, pipefp); 1454 if (strEQ(buf, ".\n")) 1455 break; 1456 } 1457 } 1458 } else { 1459 next_intuit_at(beginning_of_this_line, p_input_line); 1460 break; 1461 } 1462 } 1463 if (pipefp == NULL) 1464 return; 1465 fprintf(pipefp, "w\n"); 1466 fprintf(pipefp, "q\n"); 1467 fflush(pipefp); 1468 pclose(pipefp); 1469 ignore_signals(); 1470 if (!check_only) { 1471 if (move_file(TMPOUTNAME, outname) < 0) { 1472 toutkeep = true; 1473 chmod(TMPOUTNAME, filemode); 1474 } else 1475 chmod(outname, filemode); 1476 } 1477 set_signals(1); 1478} 1479 1480/* 1481 * Choose the name of the file to be patched based on POSIX rules. 1482 * NOTE: the POSIX rules are amazingly stupid and we only follow them 1483 * if the user specified --posix or set POSIXLY_CORRECT. 1484 */ 1485static char * 1486posix_name(const struct file_name *names, bool assume_exists) 1487{ 1488 char *path = NULL; 1489 int i; 1490 1491 /* 1492 * POSIX states that the filename will be chosen from one 1493 * of the old, new and index names (in that order) if 1494 * the file exists relative to CWD after -p stripping. 1495 */ 1496 for (i = 0; i < MAX_FILE; i++) { 1497 if (names[i].path != NULL && names[i].exists) { 1498 path = names[i].path; 1499 break; 1500 } 1501 } 1502 if (path == NULL && !assume_exists) { 1503 /* 1504 * No files found, look for something we can checkout from 1505 * RCS/SCCS dirs. Same order as above. 1506 */ 1507 for (i = 0; i < MAX_FILE; i++) { 1508 if (names[i].path != NULL && 1509 (path = checked_in(names[i].path)) != NULL) 1510 break; 1511 } 1512 /* 1513 * Still no match? Check to see if the diff could be creating 1514 * a new file. 1515 */ 1516 if (path == NULL && ok_to_create_file && 1517 names[NEW_FILE].path != NULL) 1518 path = names[NEW_FILE].path; 1519 } 1520 1521 return path ? xstrdup(path) : NULL; 1522} 1523 1524static char * 1525compare_names(const struct file_name *names, bool assume_exists, int phase) 1526{ 1527 size_t min_components, min_baselen, min_len, tmp; 1528 char *best = NULL; 1529 char *path; 1530 int i; 1531 1532 /* 1533 * The "best" name is the one with the fewest number of path 1534 * components, the shortest basename length, and the shortest 1535 * overall length (in that order). We only use the Index: file 1536 * if neither of the old or new files could be intuited from 1537 * the diff header. 1538 */ 1539 min_components = min_baselen = min_len = SIZE_MAX; 1540 for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1541 path = names[i].path; 1542 if (path == NULL || 1543 (phase == 1 && !names[i].exists && !assume_exists) || 1544 (phase == 2 && checked_in(path) == NULL)) 1545 continue; 1546 if ((tmp = num_components(path)) > min_components) 1547 continue; 1548 if (tmp < min_components) { 1549 min_components = tmp; 1550 best = path; 1551 } 1552 if ((tmp = strlen(basename(path))) > min_baselen) 1553 continue; 1554 if (tmp < min_baselen) { 1555 min_baselen = tmp; 1556 best = path; 1557 } 1558 if ((tmp = strlen(path)) > min_len) 1559 continue; 1560 min_len = tmp; 1561 best = path; 1562 } 1563 return best; 1564} 1565 1566/* 1567 * Choose the name of the file to be patched based the "best" one 1568 * available. 1569 */ 1570static char * 1571best_name(const struct file_name *names, bool assume_exists) 1572{ 1573 char *best; 1574 1575 best = compare_names(names, assume_exists, 1); 1576 if (best == NULL) { 1577 best = compare_names(names, assume_exists, 2); 1578 /* 1579 * Still no match? Check to see if the diff could be creating 1580 * a new file. 1581 */ 1582 if (best == NULL && ok_to_create_file && 1583 names[NEW_FILE].path != NULL) 1584 best = names[NEW_FILE].path; 1585 } 1586 1587 return best ? xstrdup(best) : NULL; 1588} 1589 1590static size_t 1591num_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 */ 1608static LINENUM 1609strtolinenum(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