1 /* 2 * Copyright (C) 1986-2005 The Free Software Foundation, Inc. 3 * 4 * Portions Copyright (C) 1998-2005 Derek Price, Ximbiot <http://ximbiot.com>, 5 * and others. 6 * 7 * Portions Copyright (C) 1992, Brian Berliner and Jeff Polk 8 * Portions Copyright (C) 1989-1992, Brian Berliner 9 * 10 * You may distribute under the terms of the GNU General Public License as 11 * specified in the README file that comes with the CVS source distribution. 12 * 13 * Difference 14 * 15 * Run diff against versions in the repository. Options that are specified are 16 * passed on directly to "rcsdiff". 17 * 18 * Without any file arguments, runs diff against all the currently modified 19 * files. 20 */ 21 22 #include "cvs.h" 23 24 enum diff_file 25 { 26 DIFF_ERROR, 27 DIFF_ADDED, 28 DIFF_REMOVED, 29 DIFF_DIFFERENT, 30 DIFF_SAME 31 }; 32 33 static Dtype diff_dirproc (void *callerdat, const char *dir, 34 const char *pos_repos, const char *update_dir, 35 List *entries); 36 static int diff_filesdoneproc (void *callerdat, int err, 37 const char *repos, const char *update_dir, 38 List *entries); 39 static int diff_dirleaveproc (void *callerdat, const char *dir, 40 int err, const char *update_dir, 41 List *entries); 42 static enum diff_file diff_file_nodiff (struct file_info *finfo, Vers_TS *vers, 43 enum diff_file, char **rev1_cache ); 44 static int diff_fileproc (void *callerdat, struct file_info *finfo); 45 static void diff_mark_errors (int err); 46 47 48 /* Global variables. Would be cleaner if we just put this stuff in a 49 struct like log.c does. */ 50 51 /* Command line tags, from -r option. Points into argv. */ 52 static char *diff_rev1, *diff_rev2; 53 /* Command line dates, from -D option. Malloc'd. */ 54 static char *diff_date1, *diff_date2; 55 static char *use_rev1, *use_rev2; 56 static int have_rev1_label, have_rev2_label; 57 58 /* Revision of the user file, if it is unchanged from something in the 59 repository and we want to use that fact. */ 60 static char *user_file_rev; 61 62 static char *options; 63 static char **diff_argv; 64 static int diff_argc; 65 static size_t diff_arg_allocated; 66 static int diff_errors; 67 static int empty_files; 68 69 static const char *const diff_usage[] = 70 { 71 "Usage: %s %s [-lR] [-k kopt] [format_options]\n", 72 " [[-r rev1 | -D date1] [-r rev2 | -D date2]] [files...] \n", 73 "\t-l\tLocal directory only, not recursive\n", 74 "\t-R\tProcess directories recursively.\n", 75 "\t-k kopt\tSpecify keyword expansion mode.\n", 76 "\t-D d1\tDiff revision for date against working file.\n", 77 "\t-D d2\tDiff rev1/date1 against date2.\n", 78 "\t-r rev1\tDiff revision for rev1 against working file.\n", 79 "\t-r rev2\tDiff rev1/date1 against rev2.\n", 80 "\nformat_options:\n", 81 " -i --ignore-case Consider upper- and lower-case to be the same.\n", 82 " -w --ignore-all-space Ignore all white space.\n", 83 " -b --ignore-space-change Ignore changes in the amount of white space.\n", 84 " -B --ignore-blank-lines Ignore changes whose lines are all blank.\n", 85 " -I RE --ignore-matching-lines=RE Ignore changes whose lines all match RE.\n", 86 " --binary Read and write data in binary mode.\n", 87 " -a --text Treat all files as text.\n\n", 88 " -c -C NUM --context[=NUM] Output NUM (default 2) lines of copied context.\n", 89 " -u -U NUM --unified[=NUM] Output NUM (default 2) lines of unified context.\n", 90 " -NUM Use NUM context lines.\n", 91 " -L LABEL --label LABEL Use LABEL instead of file name.\n", 92 " -p --show-c-function Show which C function each change is in.\n", 93 " -F RE --show-function-line=RE Show the most recent line matching RE.\n", 94 " --brief Output only whether files differ.\n", 95 " -e --ed Output an ed script.\n", 96 " -f --forward-ed Output something like an ed script in forward order.\n", 97 " -n --rcs Output an RCS format diff.\n", 98 " -y --side-by-side Output in two columns.\n", 99 " -W NUM --width=NUM Output at most NUM (default 130) characters per line.\n", 100 " --left-column Output only the left column of common lines.\n", 101 " --suppress-common-lines Do not output common lines.\n", 102 " --ifdef=NAME Output merged file to show `#ifdef NAME' diffs.\n", 103 " --GTYPE-group-format=GFMT Similar, but format GTYPE input groups with GFMT.\n", 104 " --line-format=LFMT Similar, but format all input lines with LFMT.\n", 105 " --LTYPE-line-format=LFMT Similar, but format LTYPE input lines with LFMT.\n", 106 " LTYPE is `old', `new', or `unchanged'. GTYPE is LTYPE or `changed'.\n", 107 " GFMT may contain:\n", 108 " %%< lines from FILE1\n", 109 " %%> lines from FILE2\n", 110 " %%= lines common to FILE1 and FILE2\n", 111 " %%[-][WIDTH][.[PREC]]{doxX}LETTER printf-style spec for LETTER\n", 112 " LETTERs are as follows for new group, lower case for old group:\n", 113 " F first line number\n", 114 " L last line number\n", 115 " N number of lines = L-F+1\n", 116 " E F-1\n", 117 " M L+1\n", 118 " LFMT may contain:\n", 119 " %%L contents of line\n", 120 " %%l contents of line, excluding any trailing newline\n", 121 " %%[-][WIDTH][.[PREC]]{doxX}n printf-style spec for input line number\n", 122 " Either GFMT or LFMT may contain:\n", 123 " %%%% %%\n", 124 " %%c'C' the single character C\n", 125 " %%c'\\OOO' the character with octal code OOO\n\n", 126 " -t --expand-tabs Expand tabs to spaces in output.\n", 127 " -T --initial-tab Make tabs line up by prepending a tab.\n\n", 128 " -N --new-file Treat absent files as empty.\n", 129 " -s --report-identical-files Report when two files are the same.\n", 130 " --horizon-lines=NUM Keep NUM lines of the common prefix and suffix.\n", 131 " -d --minimal Try hard to find a smaller set of changes.\n", 132 " -H --speed-large-files Assume large files and many scattered small changes.\n", 133 "\n(Specify the --help global option for a list of other help options)\n", 134 NULL 135 }; 136 137 /* I copied this array directly out of diff.c in diffutils 2.7, after 138 removing the following entries, none of which seem relevant to use 139 with CVS: 140 --help 141 --version (-v) 142 --recursive (-r) 143 --unidirectional-new-file (-P) 144 --starting-file (-S) 145 --exclude (-x) 146 --exclude-from (-X) 147 --sdiff-merge-assist 148 --paginate (-l) (doesn't work with library callbacks) 149 150 I changed the options which take optional arguments (--context and 151 --unified) to return a number rather than a letter, so that the 152 optional argument could be handled more easily. I changed the 153 --brief and --ifdef options to return numbers, since -q and -D mean 154 something else to cvs diff. 155 156 The numbers 129- that appear in the fourth element of some entries 157 tell the big switch in `diff' how to process those options. -- Ian 158 159 The following options, which diff lists as "An alias, no longer 160 recommended" have been removed: --file-label --entire-new-file 161 --ascii --print. */ 162 163 static struct option const longopts[] = 164 { 165 {"ignore-blank-lines", 0, 0, 'B'}, 166 {"context", 2, 0, 143}, 167 {"ifdef", 1, 0, 131}, 168 {"show-function-line", 1, 0, 'F'}, 169 {"speed-large-files", 0, 0, 'H'}, 170 {"ignore-matching-lines", 1, 0, 'I'}, 171 {"label", 1, 0, 'L'}, 172 {"new-file", 0, 0, 'N'}, 173 {"initial-tab", 0, 0, 'T'}, 174 {"width", 1, 0, 'W'}, 175 {"text", 0, 0, 'a'}, 176 {"ignore-space-change", 0, 0, 'b'}, 177 {"minimal", 0, 0, 'd'}, 178 {"ed", 0, 0, 'e'}, 179 {"forward-ed", 0, 0, 'f'}, 180 {"ignore-case", 0, 0, 'i'}, 181 {"rcs", 0, 0, 'n'}, 182 {"show-c-function", 0, 0, 'p'}, 183 184 /* This is a potentially very useful option, except the output is so 185 silly. It would be much better for it to look like "cvs rdiff -s" 186 which displays all the same info, minus quite a few lines of 187 extraneous garbage. */ 188 {"brief", 0, 0, 145}, 189 190 {"report-identical-files", 0, 0, 's'}, 191 {"expand-tabs", 0, 0, 't'}, 192 {"ignore-all-space", 0, 0, 'w'}, 193 {"side-by-side", 0, 0, 'y'}, 194 {"unified", 2, 0, 146}, 195 {"left-column", 0, 0, 129}, 196 {"suppress-common-lines", 0, 0, 130}, 197 {"old-line-format", 1, 0, 132}, 198 {"new-line-format", 1, 0, 133}, 199 {"unchanged-line-format", 1, 0, 134}, 200 {"line-format", 1, 0, 135}, 201 {"old-group-format", 1, 0, 136}, 202 {"new-group-format", 1, 0, 137}, 203 {"unchanged-group-format", 1, 0, 138}, 204 {"changed-group-format", 1, 0, 139}, 205 {"horizon-lines", 1, 0, 140}, 206 {"binary", 0, 0, 142}, 207 {0, 0, 0, 0} 208 }; 209 210 211 212 /* Add one of OPT or LONGOPT, and ARGUMENT, when present, to global DIFF_ARGV. 213 * 214 * INPUTS 215 * opt A character option representation. 216 * longopt A long option name. 217 * argument Optional option argument. 218 * 219 * GLOBALS 220 * diff_argc The number of arguments in DIFF_ARGV. 221 * diff_argv Array of argument strings. 222 * diff_arg_allocated Allocated length of DIFF_ARGV. 223 * 224 * NOTES 225 * Behavior when both OPT & LONGOPT are provided is undefined. 226 * 227 * RETURNS 228 * Nothing. 229 */ 230 static void 231 add_diff_args (char opt, const char *longopt, const char *argument) 232 { 233 char *tmp; 234 235 /* Add opt or longopt to diff_arv. */ 236 assert (opt || (longopt && *longopt)); 237 assert (!(opt && (longopt && *longopt))); 238 if (opt) tmp = Xasprintf ("-%c", opt); 239 else tmp = Xasprintf ("--%s", longopt); 240 run_add_arg_p (&diff_argc, &diff_arg_allocated, &diff_argv, tmp); 241 free (tmp); 242 243 /* When present, add ARGUMENT to DIFF_ARGV. */ 244 if (argument) 245 run_add_arg_p (&diff_argc, &diff_arg_allocated, &diff_argv, argument); 246 } 247 248 249 250 /* CVS 1.9 and similar versions seemed to have pretty weird handling 251 of -y and -T. In the cases where it called rcsdiff, 252 they would have the meanings mentioned below. In the cases where it 253 called diff, they would have the meanings mentioned in "longopts". 254 Noone seems to have missed them, so I think the right thing to do is 255 just to remove the options altogether (which I have done). 256 257 In the case of -z and -q, "cvs diff" did not accept them even back 258 when we called rcsdiff (at least, it hasn't accepted them 259 recently). 260 261 In comparing rcsdiff to the new CVS implementation, I noticed that 262 the following rcsdiff flags are not handled by CVS diff: 263 264 -y: perform diff even when the requested revisions are the 265 same revision number 266 -q: run quietly 267 -T: preserve modification time on the RCS file 268 -z: specify timezone for use in file labels 269 270 I think these are not really relevant. -y is undocumented even in 271 RCS 5.7, and seems like a minor change at best. According to RCS 272 documentation, -T only applies when a RCS file has been modified 273 because of lock changes; doesn't CVS sidestep RCS's entire lock 274 structure? -z seems to be unsupported by CVS diff, and has a 275 different meaning as a global option anyway. (Adding it could be 276 a feature, but if it is left out for now, it should not break 277 anything.) For the purposes of producing output, CVS diff appears 278 mostly to ignore -q. Maybe this should be fixed, but I think it's 279 a larger issue than the changes included here. */ 280 281 int 282 diff (int argc, char **argv) 283 { 284 int c, err = 0; 285 int local = 0; 286 int which; 287 int option_index; 288 char *diff_orig1, *diff_orig2; 289 290 if (argc == -1) 291 usage (diff_usage); 292 293 have_rev1_label = have_rev2_label = 0; 294 295 /* 296 * Note that we catch all the valid arguments here, so that we can 297 * intercept the -r arguments for doing revision diffs; and -l/-R for a 298 * non-recursive/recursive diff. 299 */ 300 301 /* Clean out our global variables (multiroot can call us multiple 302 times and the server can too, if the client sends several 303 diff commands). */ 304 run_arg_free_p (diff_argc, diff_argv); 305 diff_argc = 0; 306 307 diff_orig1 = NULL; 308 diff_orig2 = NULL; 309 diff_rev1 = NULL; 310 diff_rev2 = NULL; 311 diff_date1 = NULL; 312 diff_date2 = NULL; 313 314 optind = 0; 315 /* FIXME: This should really be allocating an argv to be passed to diff 316 * later rather than strcatting onto the opts variable. We have some 317 * handling routines that can already handle most of the argc/argv 318 * maintenance for us and currently, if anyone were to attempt to pass a 319 * quoted string in here, it would be split on spaces and tabs on its way 320 * to diff. 321 */ 322 while ((c = getopt_long (argc, argv, 323 "+abcdefhilnpstuwy0123456789BHNRTC:D:F:I:L:U:W:k:r:", 324 longopts, &option_index)) != -1) 325 { 326 switch (c) 327 { 328 case 'y': 329 add_diff_args (0, "side-by-side", NULL); 330 break; 331 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': 332 case 'h': case 'i': case 'n': case 'p': case 's': case 't': 333 case 'u': case 'w': 334 case '0': case '1': case '2': case '3': case '4': case '5': 335 case '6': case '7': case '8': case '9': 336 case 'B': case 'H': case 'T': 337 add_diff_args (c, NULL, NULL); 338 break; 339 case 'L': 340 if (have_rev1_label++) 341 if (have_rev2_label++) 342 { 343 error (0, 0, "extra -L arguments ignored"); 344 break; 345 } 346 /* Fall through. */ 347 case 'C': case 'F': case 'I': case 'U': case 'W': 348 add_diff_args (c, NULL, optarg); 349 break; 350 case 129: case 130: case 131: case 132: case 133: case 134: 351 case 135: case 136: case 137: case 138: case 139: case 140: 352 case 141: case 142: case 143: case 145: case 146: 353 add_diff_args (0, longopts[option_index].name, 354 longopts[option_index].has_arg ? optarg : NULL); 355 break; 356 case 'R': 357 local = 0; 358 break; 359 case 'l': 360 local = 1; 361 break; 362 case 'k': 363 if (options) 364 free (options); 365 options = RCS_check_kflag (optarg); 366 break; 367 case 'r': 368 if (diff_rev2 || diff_date2) 369 error (1, 0, 370 "no more than two revisions/dates can be specified"); 371 if (diff_rev1 || diff_date1) 372 { 373 diff_orig2 = xstrdup (optarg); 374 parse_tagdate (&diff_rev2, &diff_date2, optarg); 375 } 376 else 377 { 378 diff_orig1 = xstrdup (optarg); 379 parse_tagdate (&diff_rev1, &diff_date1, optarg); 380 } 381 break; 382 case 'D': 383 if (diff_rev2 || diff_date2) 384 error (1, 0, 385 "no more than two revisions/dates can be specified"); 386 if (diff_rev1 || diff_date1) 387 diff_date2 = Make_Date (optarg); 388 else 389 diff_date1 = Make_Date (optarg); 390 break; 391 case 'N': 392 empty_files = 1; 393 break; 394 case '?': 395 default: 396 usage (diff_usage); 397 break; 398 } 399 } 400 argc -= optind; 401 argv += optind; 402 403 /* make sure options is non-null */ 404 if (!options) 405 options = xstrdup (""); 406 407 #ifdef CLIENT_SUPPORT 408 if (current_parsed_root->isremote) { 409 /* We're the client side. Fire up the remote server. */ 410 start_server (); 411 412 ign_setup (); 413 414 if (local) 415 send_arg("-l"); 416 if (empty_files) 417 send_arg("-N"); 418 send_options (diff_argc, diff_argv); 419 if (options[0] != '\0') 420 send_arg (options); 421 if (diff_orig1) 422 option_with_arg ("-r", diff_orig1); 423 else if (diff_date1) 424 client_senddate (diff_date1); 425 if (diff_orig2) 426 option_with_arg ("-r", diff_orig2); 427 else if (diff_date2) 428 client_senddate (diff_date2); 429 send_arg ("--"); 430 431 /* Send the current files unless diffing two revs from the archive */ 432 if (!diff_rev2 && !diff_date2) 433 send_files (argc, argv, local, 0, 0); 434 else 435 send_files (argc, argv, local, 0, SEND_NO_CONTENTS); 436 437 send_file_names (argc, argv, SEND_EXPAND_WILD); 438 439 send_to_server ("diff\012", 0); 440 err = get_responses_and_close (); 441 free (options); 442 options = NULL; 443 return err; 444 } 445 #endif 446 447 if (diff_rev1 != NULL) 448 tag_check_valid (diff_rev1, argc, argv, local, 0, "", false); 449 if (diff_rev2 != NULL) 450 tag_check_valid (diff_rev2, argc, argv, local, 0, "", false); 451 452 which = W_LOCAL; 453 if (diff_rev1 || diff_date1) 454 which |= W_REPOS | W_ATTIC; 455 456 wrap_setup (); 457 458 /* start the recursion processor */ 459 err = start_recursion (diff_fileproc, diff_filesdoneproc, diff_dirproc, 460 diff_dirleaveproc, NULL, argc, argv, local, 461 which, 0, CVS_LOCK_READ, NULL, 1, NULL); 462 463 /* clean up */ 464 free (options); 465 options = NULL; 466 467 if (diff_date1 != NULL) 468 free (diff_date1); 469 if (diff_date2 != NULL) 470 free (diff_date2); 471 472 return err; 473 } 474 475 476 477 /* 478 * Do a file diff 479 */ 480 /* ARGSUSED */ 481 static int 482 diff_fileproc (void *callerdat, struct file_info *finfo) 483 { 484 int status, err = 2; /* 2 == trouble, like rcsdiff */ 485 Vers_TS *vers; 486 enum diff_file empty_file = DIFF_DIFFERENT; 487 char *tmp = NULL; 488 char *tocvsPath = NULL; 489 char *fname = NULL; 490 char *label1; 491 char *label2; 492 char *rev1_cache = NULL; 493 494 user_file_rev = 0; 495 vers = Version_TS (finfo, NULL, NULL, NULL, 1, 0); 496 497 if (diff_rev2 || diff_date2) 498 { 499 /* Skip all the following checks regarding the user file; we're 500 not using it. */ 501 } 502 else if (vers->vn_user == NULL) 503 { 504 /* The file does not exist in the working directory. */ 505 if ((diff_rev1 || diff_date1) 506 && vers->srcfile != NULL) 507 { 508 /* The file does exist in the repository. */ 509 if (empty_files) 510 empty_file = DIFF_REMOVED; 511 else 512 { 513 int exists; 514 515 exists = 0; 516 /* special handling for TAG_HEAD */ 517 if (diff_rev1 && strcmp (diff_rev1, TAG_HEAD) == 0) 518 { 519 char *head = 520 (vers->vn_rcs == NULL 521 ? NULL 522 : RCS_branch_head (vers->srcfile, vers->vn_rcs)); 523 exists = head != NULL && !RCS_isdead (vers->srcfile, head); 524 if (head != NULL) 525 free (head); 526 } 527 else 528 { 529 Vers_TS *xvers; 530 531 xvers = Version_TS (finfo, NULL, diff_rev1, diff_date1, 532 1, 0); 533 exists = xvers->vn_rcs && !RCS_isdead (xvers->srcfile, 534 xvers->vn_rcs); 535 freevers_ts (&xvers); 536 } 537 if (exists) 538 error (0, 0, 539 "%s no longer exists, no comparison available", 540 finfo->fullname); 541 goto out; 542 } 543 } 544 else 545 { 546 error (0, 0, "I know nothing about %s", finfo->fullname); 547 goto out; 548 } 549 } 550 else if (vers->vn_user[0] == '0' && vers->vn_user[1] == '\0') 551 { 552 /* The file was added locally. */ 553 int exists = 0; 554 555 if (vers->srcfile != NULL) 556 { 557 /* The file does exist in the repository. */ 558 559 if (diff_rev1 || diff_date1) 560 { 561 /* special handling for TAG_HEAD */ 562 if (diff_rev1 && strcmp (diff_rev1, TAG_HEAD) == 0) 563 { 564 char *head = 565 (vers->vn_rcs == NULL 566 ? NULL 567 : RCS_branch_head (vers->srcfile, vers->vn_rcs)); 568 exists = head && !RCS_isdead (vers->srcfile, head); 569 if (head != NULL) 570 free (head); 571 } 572 else 573 { 574 Vers_TS *xvers; 575 576 xvers = Version_TS (finfo, NULL, diff_rev1, diff_date1, 577 1, 0); 578 exists = xvers->vn_rcs 579 && !RCS_isdead (xvers->srcfile, xvers->vn_rcs); 580 freevers_ts (&xvers); 581 } 582 } 583 else 584 { 585 /* The file was added locally, but an RCS archive exists. Our 586 * base revision must be dead. 587 */ 588 /* No need to set, exists = 0, here. That's the default. */ 589 } 590 } 591 if (!exists) 592 { 593 /* If we got here, then either the RCS archive does not exist or 594 * the relevant revision is dead. 595 */ 596 if (empty_files) 597 empty_file = DIFF_ADDED; 598 else 599 { 600 error (0, 0, "%s is a new entry, no comparison available", 601 finfo->fullname); 602 goto out; 603 } 604 } 605 } 606 else if (vers->vn_user[0] == '-') 607 { 608 if (empty_files) 609 empty_file = DIFF_REMOVED; 610 else 611 { 612 error (0, 0, "%s was removed, no comparison available", 613 finfo->fullname); 614 goto out; 615 } 616 } 617 else 618 { 619 if (!vers->vn_rcs && !vers->srcfile) 620 { 621 error (0, 0, "cannot find revision control file for %s", 622 finfo->fullname); 623 goto out; 624 } 625 else 626 { 627 if (vers->ts_user == NULL) 628 { 629 error (0, 0, "cannot find %s", finfo->fullname); 630 goto out; 631 } 632 else if (!strcmp (vers->ts_user, vers->ts_rcs)) 633 { 634 /* The user file matches some revision in the repository 635 Diff against the repository (for remote CVS, we might not 636 have a copy of the user file around). */ 637 user_file_rev = vers->vn_user; 638 } 639 } 640 } 641 642 empty_file = diff_file_nodiff (finfo, vers, empty_file, &rev1_cache); 643 if (empty_file == DIFF_SAME) 644 { 645 /* In the server case, would be nice to send a "Checked-in" 646 response, so that the client can rewrite its timestamp. 647 server_checked_in by itself isn't the right thing (it 648 needs a server_register), but I'm not sure what is. 649 It isn't clear to me how "cvs status" handles this (that 650 is, for a client which sends Modified not Is-modified to 651 "cvs status"), but it does. */ 652 err = 0; 653 goto out; 654 } 655 else if (empty_file == DIFF_ERROR) 656 goto out; 657 658 /* Output an "Index:" line for patch to use */ 659 cvs_output ("Index: ", 0); 660 cvs_output (finfo->fullname, 0); 661 cvs_output ("\n", 1); 662 663 tocvsPath = wrap_tocvs_process_file (finfo->file); 664 if (tocvsPath) 665 { 666 /* Backup the current version of the file to CVS/,,filename */ 667 fname = Xasprintf (fname, "%s/%s%s", CVSADM, CVSPREFIX, finfo->file); 668 if (unlink_file_dir (fname) < 0) 669 if (!existence_error (errno)) 670 error (1, errno, "cannot remove %s", fname); 671 rename_file (finfo->file, fname); 672 /* Copy the wrapped file to the current directory then go to work */ 673 copy_file (tocvsPath, finfo->file); 674 } 675 676 /* Set up file labels appropriate for compatibility with the Larry Wall 677 * implementation of patch if the user didn't specify. This is irrelevant 678 * according to the POSIX.2 specification. 679 */ 680 label1 = NULL; 681 label2 = NULL; 682 /* The user cannot set the rev2 label without first setting the rev1 683 * label. 684 */ 685 if (!have_rev2_label) 686 { 687 if (empty_file == DIFF_REMOVED) 688 label2 = make_file_label (DEVNULL, NULL, NULL); 689 else 690 label2 = make_file_label (finfo->fullname, use_rev2, 691 vers->srcfile); 692 if (!have_rev1_label) 693 { 694 if (empty_file == DIFF_ADDED) 695 label1 = make_file_label (DEVNULL, NULL, NULL); 696 else 697 label1 = make_file_label (finfo->fullname, use_rev1, 698 vers->srcfile); 699 } 700 } 701 702 if (empty_file == DIFF_ADDED || empty_file == DIFF_REMOVED) 703 { 704 /* This is fullname, not file, possibly despite the POSIX.2 705 * specification, because that's the way all the Larry Wall 706 * implementations of patch (are there other implementations?) want 707 * things and the POSIX.2 spec appears to leave room for this. 708 */ 709 cvs_output ("\ 710 ===================================================================\n\ 711 RCS file: ", 0); 712 cvs_output (finfo->fullname, 0); 713 cvs_output ("\n", 1); 714 715 cvs_output ("diff -N ", 0); 716 cvs_output (finfo->fullname, 0); 717 cvs_output ("\n", 1); 718 719 if (empty_file == DIFF_ADDED) 720 { 721 if (use_rev2 == NULL) 722 status = diff_exec (DEVNULL, finfo->file, label1, label2, 723 diff_argc, diff_argv, RUN_TTY); 724 else 725 { 726 int retcode; 727 728 tmp = cvs_temp_name (); 729 retcode = RCS_checkout (vers->srcfile, NULL, use_rev2, NULL, 730 *options ? options : vers->options, 731 tmp, NULL, NULL); 732 if (retcode != 0) 733 goto out; 734 735 status = diff_exec (DEVNULL, tmp, label1, label2, 736 diff_argc, diff_argv, RUN_TTY); 737 } 738 } 739 else 740 { 741 int retcode; 742 743 tmp = cvs_temp_name (); 744 retcode = RCS_checkout (vers->srcfile, NULL, use_rev1, NULL, 745 *options ? options : vers->options, 746 tmp, NULL, NULL); 747 if (retcode != 0) 748 goto out; 749 750 status = diff_exec (tmp, DEVNULL, label1, label2, 751 diff_argc, diff_argv, RUN_TTY); 752 } 753 } 754 else 755 { 756 status = RCS_exec_rcsdiff (vers->srcfile, diff_argc, diff_argv, 757 *options ? options : vers->options, 758 use_rev1, rev1_cache, use_rev2, 759 label1, label2, finfo->file); 760 761 } 762 763 if (label1) free (label1); 764 if (label2) free (label2); 765 766 switch (status) 767 { 768 case -1: /* fork failed */ 769 error (1, errno, "fork failed while diffing %s", 770 vers->srcfile->path); 771 case 0: /* everything ok */ 772 err = 0; 773 break; 774 default: /* other error */ 775 err = status; 776 break; 777 } 778 779 out: 780 if( tocvsPath != NULL ) 781 { 782 if (unlink_file_dir (finfo->file) < 0) 783 if (! existence_error (errno)) 784 error (1, errno, "cannot remove %s", finfo->file); 785 786 rename_file (fname, finfo->file); 787 if (unlink_file (tocvsPath) < 0) 788 error (1, errno, "cannot remove %s", tocvsPath); 789 free (fname); 790 } 791 792 /* Call CVS_UNLINK() rather than unlink_file() below to avoid the check 793 * for noexec. 794 */ 795 if (tmp != NULL) 796 { 797 if (CVS_UNLINK (tmp) < 0) 798 error (0, errno, "cannot remove %s", tmp); 799 free (tmp); 800 } 801 if (rev1_cache != NULL) 802 { 803 if (CVS_UNLINK (rev1_cache) < 0) 804 error (0, errno, "cannot remove %s", rev1_cache); 805 free (rev1_cache); 806 } 807 808 freevers_ts (&vers); 809 diff_mark_errors (err); 810 return err; 811 } 812 813 814 815 /* 816 * Remember the exit status for each file. 817 */ 818 static void 819 diff_mark_errors (int err) 820 { 821 if (err > diff_errors) 822 diff_errors = err; 823 } 824 825 826 827 /* 828 * Print a warm fuzzy message when we enter a dir 829 * 830 * Don't try to diff directories that don't exist! -- DW 831 */ 832 /* ARGSUSED */ 833 static Dtype 834 diff_dirproc (void *callerdat, const char *dir, const char *pos_repos, 835 const char *update_dir, List *entries) 836 { 837 /* XXX - check for dirs we don't want to process??? */ 838 839 /* YES ... for instance dirs that don't exist!!! -- DW */ 840 if (!isdir (dir)) 841 return R_SKIP_ALL; 842 843 if (!quiet) 844 error (0, 0, "Diffing %s", update_dir); 845 return R_PROCESS; 846 } 847 848 849 850 /* 851 * Concoct the proper exit status - done with files 852 */ 853 /* ARGSUSED */ 854 static int 855 diff_filesdoneproc (void *callerdat, int err, const char *repos, 856 const char *update_dir, List *entries) 857 { 858 return diff_errors; 859 } 860 861 862 863 /* 864 * Concoct the proper exit status - leaving directories 865 */ 866 /* ARGSUSED */ 867 static int 868 diff_dirleaveproc (void *callerdat, const char *dir, int err, 869 const char *update_dir, List *entries) 870 { 871 return diff_errors; 872 } 873 874 875 876 /* 877 * verify that a file is different 878 * 879 * INPUTS 880 * finfo 881 * vers 882 * empty_file 883 * 884 * OUTPUTS 885 * rev1_cache Cache the contents of rev1 if we look it up. 886 */ 887 static enum diff_file 888 diff_file_nodiff (struct file_info *finfo, Vers_TS *vers, 889 enum diff_file empty_file, char **rev1_cache) 890 { 891 Vers_TS *xvers; 892 int retcode; 893 894 TRACE (TRACE_FUNCTION, "diff_file_nodiff (%s, %d)", 895 finfo->fullname ? finfo->fullname : "(null)", empty_file); 896 897 /* free up any old use_rev* variables and reset 'em */ 898 if (use_rev1) 899 free (use_rev1); 900 if (use_rev2) 901 free (use_rev2); 902 use_rev1 = use_rev2 = NULL; 903 904 if (diff_rev1 || diff_date1) 905 { 906 /* special handling for TAG_HEAD */ 907 if (diff_rev1 && strcmp (diff_rev1, TAG_HEAD) == 0) 908 { 909 if (vers->vn_rcs != NULL && vers->srcfile != NULL) 910 use_rev1 = RCS_branch_head (vers->srcfile, vers->vn_rcs); 911 } 912 else 913 { 914 xvers = Version_TS (finfo, NULL, diff_rev1, diff_date1, 1, 0); 915 if (xvers->vn_rcs != NULL) 916 use_rev1 = xstrdup (xvers->vn_rcs); 917 freevers_ts (&xvers); 918 } 919 } 920 if (diff_rev2 || diff_date2) 921 { 922 /* special handling for TAG_HEAD */ 923 if (diff_rev2 && strcmp (diff_rev2, TAG_HEAD) == 0) 924 { 925 if (vers->vn_rcs && vers->srcfile) 926 use_rev2 = RCS_branch_head (vers->srcfile, vers->vn_rcs); 927 } 928 else 929 { 930 xvers = Version_TS (finfo, NULL, diff_rev2, diff_date2, 1, 0); 931 if (xvers->vn_rcs != NULL) 932 use_rev2 = xstrdup (xvers->vn_rcs); 933 freevers_ts (&xvers); 934 } 935 936 if (use_rev1 == NULL || RCS_isdead (vers->srcfile, use_rev1)) 937 { 938 /* The first revision does not exist. If EMPTY_FILES is 939 true, treat this as an added file. Otherwise, warn 940 about the missing tag. */ 941 if (use_rev2 == NULL || RCS_isdead (vers->srcfile, use_rev2)) 942 /* At least in the case where DIFF_REV1 and DIFF_REV2 943 * are both numeric (and non-existant (NULL), as opposed to 944 * dead?), we should be returning some kind of error (see 945 * basicb-8a0 in testsuite). The symbolic case may be more 946 * complicated. 947 */ 948 return DIFF_SAME; 949 if (empty_files) 950 return DIFF_ADDED; 951 if (use_rev1 != NULL) 952 { 953 if (diff_rev1) 954 { 955 error (0, 0, 956 "Tag %s refers to a dead (removed) revision in file `%s'.", 957 diff_rev1, finfo->fullname); 958 } 959 else 960 { 961 error (0, 0, 962 "Date %s refers to a dead (removed) revision in file `%s'.", 963 diff_date1, finfo->fullname); 964 } 965 error (0, 0, 966 "No comparison available. Pass `-N' to `%s diff'?", 967 program_name); 968 } 969 else if (diff_rev1) 970 error (0, 0, "tag %s is not in file %s", diff_rev1, 971 finfo->fullname); 972 else 973 error (0, 0, "no revision for date %s in file %s", 974 diff_date1, finfo->fullname); 975 return DIFF_ERROR; 976 } 977 978 assert( use_rev1 != NULL ); 979 if( use_rev2 == NULL || RCS_isdead( vers->srcfile, use_rev2 ) ) 980 { 981 /* The second revision does not exist. If EMPTY_FILES is 982 true, treat this as a removed file. Otherwise warn 983 about the missing tag. */ 984 if (empty_files) 985 return DIFF_REMOVED; 986 if( use_rev2 != NULL ) 987 { 988 if (diff_rev2) 989 { 990 error( 0, 0, 991 "Tag %s refers to a dead (removed) revision in file `%s'.", 992 diff_rev2, finfo->fullname ); 993 } 994 else 995 { 996 error( 0, 0, 997 "Date %s refers to a dead (removed) revision in file `%s'.", 998 diff_date2, finfo->fullname ); 999 } 1000 error( 0, 0, 1001 "No comparison available. Pass `-N' to `%s diff'?", 1002 program_name ); 1003 } 1004 else if (diff_rev2) 1005 error (0, 0, "tag %s is not in file %s", diff_rev2, 1006 finfo->fullname); 1007 else 1008 error (0, 0, "no revision for date %s in file %s", 1009 diff_date2, finfo->fullname); 1010 return DIFF_ERROR; 1011 } 1012 /* Now, see if we really need to do the diff. We can't assume that the 1013 * files are different when the revs are. 1014 */ 1015 assert( use_rev2 != NULL ); 1016 if( strcmp (use_rev1, use_rev2) == 0 ) 1017 return DIFF_SAME; 1018 /* else fall through and do the diff */ 1019 } 1020 1021 /* If we had a r1/d1 & r2/d2, then at this point we must have a C3P0... 1022 * err... ok, then both rev1 & rev2 must have resolved to an existing, 1023 * live version due to if statement we just closed. 1024 */ 1025 assert (!(diff_rev2 || diff_date2) || (use_rev1 && use_rev2)); 1026 1027 if ((diff_rev1 || diff_date1) && 1028 (use_rev1 == NULL || RCS_isdead (vers->srcfile, use_rev1))) 1029 { 1030 /* The first revision does not exist, and no second revision 1031 was given. */ 1032 if (empty_files) 1033 { 1034 if (empty_file == DIFF_REMOVED) 1035 return DIFF_SAME; 1036 if( user_file_rev && use_rev2 == NULL ) 1037 use_rev2 = xstrdup( user_file_rev ); 1038 return DIFF_ADDED; 1039 } 1040 if( use_rev1 != NULL ) 1041 { 1042 if (diff_rev1) 1043 { 1044 error( 0, 0, 1045 "Tag %s refers to a dead (removed) revision in file `%s'.", 1046 diff_rev1, finfo->fullname ); 1047 } 1048 else 1049 { 1050 error( 0, 0, 1051 "Date %s refers to a dead (removed) revision in file `%s'.", 1052 diff_date1, finfo->fullname ); 1053 } 1054 error( 0, 0, 1055 "No comparison available. Pass `-N' to `%s diff'?", 1056 program_name ); 1057 } 1058 else if ( diff_rev1 ) 1059 error( 0, 0, "tag %s is not in file %s", diff_rev1, 1060 finfo->fullname ); 1061 else 1062 error( 0, 0, "no revision for date %s in file %s", 1063 diff_date1, finfo->fullname ); 1064 return DIFF_ERROR; 1065 } 1066 1067 assert( !diff_rev1 || use_rev1 ); 1068 1069 if (user_file_rev) 1070 { 1071 /* drop user_file_rev into first unused use_rev */ 1072 if (!use_rev1) 1073 use_rev1 = xstrdup (user_file_rev); 1074 else if (!use_rev2) 1075 use_rev2 = xstrdup (user_file_rev); 1076 /* and if not, it wasn't needed anyhow */ 1077 user_file_rev = NULL; 1078 } 1079 1080 /* Now, see if we really need to do the diff. We can't assume that the 1081 * files are different when the revs are. 1082 */ 1083 if( use_rev1 && use_rev2) 1084 { 1085 if (strcmp (use_rev1, use_rev2) == 0) 1086 return DIFF_SAME; 1087 /* Fall through and do the diff. */ 1088 } 1089 /* Don't want to do the timestamp check with both use_rev1 & use_rev2 set. 1090 * The timestamp check is just for the default case of diffing the 1091 * workspace file against its base revision. 1092 */ 1093 else if( use_rev1 == NULL 1094 || ( vers->vn_user != NULL 1095 && strcmp( use_rev1, vers->vn_user ) == 0 ) ) 1096 { 1097 if (empty_file == DIFF_DIFFERENT 1098 && vers->ts_user != NULL 1099 && strcmp (vers->ts_rcs, vers->ts_user) == 0 1100 && (!(*options) || strcmp (options, vers->options) == 0)) 1101 { 1102 return DIFF_SAME; 1103 } 1104 if (use_rev1 == NULL 1105 && (vers->vn_user[0] != '0' || vers->vn_user[1] != '\0')) 1106 { 1107 if (vers->vn_user[0] == '-') 1108 use_rev1 = xstrdup (vers->vn_user + 1); 1109 else 1110 use_rev1 = xstrdup (vers->vn_user); 1111 } 1112 } 1113 1114 /* If we already know that the file is being added or removed, 1115 then we don't want to do an actual file comparison here. */ 1116 if (empty_file != DIFF_DIFFERENT) 1117 return empty_file; 1118 1119 /* 1120 * Run a quick cmp to see if we should bother with a full diff. 1121 */ 1122 1123 retcode = RCS_cmp_file( vers->srcfile, use_rev1, rev1_cache, 1124 use_rev2, *options ? options : vers->options, 1125 finfo->file ); 1126 1127 return retcode == 0 ? DIFF_SAME : DIFF_DIFFERENT; 1128 } 1129