1/* RCS stream editor */ 2 3/****************************************************************************** 4 * edits the input file according to a 5 * script from stdin, generated by diff -n 6 * performs keyword expansion 7 ****************************************************************************** 8 */ 9 10/* Copyright 1982, 1988, 1989 Walter Tichy 11 Copyright 1990, 1991, 1992, 1993, 1994, 1995 Paul Eggert 12 Distributed under license by the Free Software Foundation, Inc. 13 14This file is part of RCS. 15 16RCS is free software; you can redistribute it and/or modify 17it under the terms of the GNU General Public License as published by 18the Free Software Foundation; either version 2, or (at your option) 19any later version. 20 21RCS is distributed in the hope that it will be useful, 22but WITHOUT ANY WARRANTY; without even the implied warranty of 23MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 24GNU General Public License for more details. 25 26You should have received a copy of the GNU General Public License 27along with RCS; see the file COPYING. 28If not, write to the Free Software Foundation, 2959 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 30 31Report problems and direct all questions to: 32 33 rcs-bugs@cs.purdue.edu 34 35*/ 36 37/* 38 * Revision 5.19 1995/06/16 06:19:24 eggert 39 * Update FSF address. 40 * 41 * Revision 5.18 1995/06/01 16:23:43 eggert 42 * (dirtpname): No longer external. 43 * (do_link): Simplify logic. 44 * (finisheditline, finishedit): Replace Iseek/Itell with what they stand for. 45 * (fopen_update_truncate): Replace `#if' with `if'. 46 * (keyreplace, makedirtemp): dirlen(x) -> basefilename(x)-x. 47 * 48 * (edit_string): Fix bug: if !large_memory, a bogus trailing `@' was output 49 * at the end of incomplete lines. 50 * 51 * (keyreplace): Do not assume that seeking backwards 52 * at the start of a file will fail; on some systems it succeeds. 53 * Convert C- and Pascal-style comment starts to ` *' in comment leader. 54 * 55 * (rcswriteopen): Use fdSafer to get safer file descriptor. 56 * Open RCS file with FOPEN_RB. 57 * 58 * (chnamemod): Work around bad_NFS_rename bug; don't ignore un_link result. 59 * Fall back on chmod if fchmod fails, since it might be ENOSYS. 60 * 61 * (aflush): Move to rcslex.c. 62 * 63 * Revision 5.17 1994/03/20 04:52:58 eggert 64 * Normally calculate the $Log prefix from context, not from RCS file. 65 * Move setmtime here from rcsutil.c. Add ORCSerror. Remove lint. 66 * 67 * Revision 5.16 1993/11/03 17:42:27 eggert 68 * Add -z. Add Name keyword. If bad_unlink, ignore errno when unlink fails. 69 * Escape white space, $, and \ in keyword string file names. 70 * Don't output 2 spaces between date and time after Log. 71 * 72 * Revision 5.15 1992/07/28 16:12:44 eggert 73 * Some hosts have readlink but not ELOOP. Avoid `unsigned'. 74 * Preserve dates more systematically. Statement macro names now end in _. 75 * 76 * Revision 5.14 1992/02/17 23:02:24 eggert 77 * Add -T support. 78 * 79 * Revision 5.13 1992/01/24 18:44:19 eggert 80 * Add support for bad_chmod_close, bad_creat0. 81 * 82 * Revision 5.12 1992/01/06 02:42:34 eggert 83 * Add setmode parameter to chnamemod. addsymbol now reports changes. 84 * while (E) ; -> while (E) continue; 85 * 86 * Revision 5.11 1991/11/03 01:11:44 eggert 87 * Move the warning about link breaking to where they're actually being broken. 88 * 89 * Revision 5.10 1991/10/07 17:32:46 eggert 90 * Support piece tables even if !has_mmap. Fix rare NFS bugs. 91 * 92 * Revision 5.9 1991/09/17 19:07:40 eggert 93 * SGI readlink() yields ENXIO, not EINVAL, for nonlinks. 94 * 95 * Revision 5.8 1991/08/19 03:13:55 eggert 96 * Add piece tables, NFS bug workarounds. Catch odd filenames. Tune. 97 * 98 * Revision 5.7 1991/04/21 11:58:21 eggert 99 * Fix errno bugs. Add -x, RCSINIT, MS-DOS support. 100 * 101 * Revision 5.6 1991/02/25 07:12:40 eggert 102 * Fix setuid bug. Support new link behavior. Work around broken "w+" fopen. 103 * 104 * Revision 5.5 1990/12/30 05:07:35 eggert 105 * Fix report of busy RCS files when !defined(O_CREAT) | !defined(O_EXCL). 106 * 107 * Revision 5.4 1990/11/01 05:03:40 eggert 108 * Permit arbitrary data in comment leaders. 109 * 110 * Revision 5.3 1990/09/11 02:41:13 eggert 111 * Tune expandline(). 112 * 113 * Revision 5.2 1990/09/04 08:02:21 eggert 114 * Count RCS lines better. Improve incomplete line handling. 115 * 116 * Revision 5.1 1990/08/29 07:13:56 eggert 117 * Add -kkvl. 118 * Fix bug when getting revisions to files ending in incomplete lines. 119 * Fix bug in comment leader expansion. 120 * 121 * Revision 5.0 1990/08/22 08:12:47 eggert 122 * Don't require final newline. 123 * Don't append "checked in with -k by " to logs, 124 * so that checking in a program with -k doesn't change it. 125 * Don't generate trailing white space for empty comment leader. 126 * Remove compile-time limits; use malloc instead. Add -k, -V. 127 * Permit dates past 1999/12/31. Make lock and temp files faster and safer. 128 * Ansify and Posixate. Check diff's output. 129 * 130 * Revision 4.8 89/05/01 15:12:35 narten 131 * changed copyright header to reflect current distribution rules 132 * 133 * Revision 4.7 88/11/08 13:54:14 narten 134 * misplaced semicolon caused infinite loop 135 * 136 * Revision 4.6 88/08/09 19:12:45 eggert 137 * Shrink stdio code size; allow cc -R. 138 * 139 * Revision 4.5 87/12/18 11:38:46 narten 140 * Changes from the 43. version. Don't know the significance of the 141 * first change involving "rewind". Also, additional "lint" cleanup. 142 * (Guy Harris) 143 * 144 * Revision 4.4 87/10/18 10:32:21 narten 145 * Updating version numbers. Changes relative to version 1.1 actually 146 * relative to 4.1 147 * 148 * Revision 1.4 87/09/24 13:59:29 narten 149 * Sources now pass through lint (if you ignore printf/sprintf/fprintf 150 * warnings) 151 * 152 * Revision 1.3 87/09/15 16:39:39 shepler 153 * added an initializatin of the variables editline and linecorr 154 * this will be done each time a file is processed. 155 * (there was an obscure bug where if co was used to retrieve multiple files 156 * it would dump) 157 * fix attributed to Roy Morris @FileNet Corp ...!felix!roy 158 * 159 * Revision 1.2 87/03/27 14:22:17 jenkins 160 * Port to suns 161 * 162 * Revision 4.1 83/05/12 13:10:30 wft 163 * Added new markers Id and RCSfile; added locker to Header and Id. 164 * Overhauled expandline completely() (problem with $01234567890123456789@). 165 * Moved trymatch() and marker table to rcskeys.c. 166 * 167 * Revision 3.7 83/05/12 13:04:39 wft 168 * Added retry to expandline to resume after failed match which ended in $. 169 * Fixed truncation problem for $19chars followed by@@. 170 * Log no longer expands full path of RCS file. 171 * 172 * Revision 3.6 83/05/11 16:06:30 wft 173 * added retry to expandline to resume after failed match which ended in $. 174 * Fixed truncation problem for $19chars followed by@@. 175 * 176 * Revision 3.5 82/12/04 13:20:56 wft 177 * Added expansion of keyword Locker. 178 * 179 * Revision 3.4 82/12/03 12:26:54 wft 180 * Added line number correction in case editing does not start at the 181 * beginning of the file. 182 * Changed keyword expansion to always print a space before closing KDELIM; 183 * Expansion for Header shortened. 184 * 185 * Revision 3.3 82/11/14 14:49:30 wft 186 * removed Suffix from keyword expansion. Replaced fclose with ffclose. 187 * keyreplace() gets log message from delta, not from curlogmsg. 188 * fixed expression overflow in while(c=putc(GETC.... 189 * checked nil printing. 190 * 191 * Revision 3.2 82/10/18 21:13:39 wft 192 * I added checks for write errors during the co process, and renamed 193 * expandstring() to xpandstring(). 194 * 195 * Revision 3.1 82/10/13 15:52:55 wft 196 * changed type of result of getc() from char to int. 197 * made keyword expansion loop in expandline() portable to machines 198 * without sign-extension. 199 */ 200 201 202#include "rcsbase.h" 203 204libId(editId, "$FreeBSD: releng/10.2/gnu/usr.bin/rcs/lib/rcsedit.c 76301 2001-05-06 03:07:12Z kris $") 205 206static void editEndsPrematurely P((void)) exiting; 207static void editLineNumberOverflow P((void)) exiting; 208static void escape_string P((FILE*,char const*)); 209static void keyreplace P((enum markers,struct hshentry const*,int,RILE*,FILE*,int)); 210 211FILE *fcopy; /* result file descriptor */ 212char const *resultname; /* result pathname */ 213int locker_expansion; /* should the locker name be appended to Id val? */ 214#if !large_memory 215 static RILE *fedit; /* edit file descriptor */ 216 static char const *editname; /* edit pathname */ 217#endif 218static long editline; /* edit line counter; #lines before cursor */ 219static long linecorr; /* #adds - #deletes in each edit run. */ 220 /*used to correct editline in case file is not rewound after */ 221 /* applying one delta */ 222 223/* indexes into dirtpname */ 224#define lockdirtp_index 0 225#define newRCSdirtp_index bad_creat0 226#define newworkdirtp_index (newRCSdirtp_index+1) 227#define DIRTEMPNAMES (newworkdirtp_index + 1) 228 229enum maker {notmade, real, effective}; 230static struct buf dirtpname[DIRTEMPNAMES]; /* unlink these when done */ 231static enum maker volatile dirtpmaker[DIRTEMPNAMES]; /* if these are set */ 232#define lockname (dirtpname[lockdirtp_index].string) 233#define newRCSname (dirtpname[newRCSdirtp_index].string) 234 235 236#if has_NFS || bad_unlink 237 int 238un_link(s) 239 char const *s; 240/* 241 * Remove S, even if it is unwritable. 242 * Ignore unlink() ENOENT failures; NFS generates bogus ones. 243 */ 244{ 245# if bad_unlink 246 if (unlink(s) == 0) 247 return 0; 248 else { 249 int e = errno; 250 /* 251 * Forge ahead even if errno == ENOENT; some completely 252 * brain-damaged hosts (e.g. PCTCP 2.2) yield ENOENT 253 * even for existing unwritable files. 254 */ 255 if (chmod(s, S_IWUSR) != 0) { 256 errno = e; 257 return -1; 258 } 259 } 260# endif 261# if has_NFS 262 return unlink(s)==0 || errno==ENOENT ? 0 : -1; 263# else 264 return unlink(s); 265# endif 266} 267#endif 268 269#if !has_rename 270# if !has_NFS 271# define do_link(s,t) link(s,t) 272# else 273 static int do_link P((char const*,char const*)); 274 static int 275do_link(s, t) 276 char const *s, *t; 277/* Link S to T, ignoring bogus EEXIST problems due to NFS failures. */ 278{ 279 int r = link(s, t); 280 281 if (r != 0 && errno == EEXIST) { 282 struct stat sb, tb; 283 if ( 284 stat(s, &sb) == 0 && 285 stat(t, &tb) == 0 && 286 same_file(sb, tb, 0) 287 ) 288 r = 0; 289 errno = EEXIST; 290 } 291 return r; 292} 293# endif 294#endif 295 296 297 static void 298editEndsPrematurely() 299{ 300 fatserror("edit script ends prematurely"); 301} 302 303 static void 304editLineNumberOverflow() 305{ 306 fatserror("edit script refers to line past end of file"); 307} 308 309 310#if large_memory 311 312#if has_memmove 313# define movelines(s1, s2, n) VOID memmove(s1, s2, (n)*sizeof(Iptr_type)) 314#else 315 static void movelines P((Iptr_type*,Iptr_type const*,long)); 316 static void 317movelines(s1, s2, n) 318 register Iptr_type *s1; 319 register Iptr_type const *s2; 320 register long n; 321{ 322 if (s1 < s2) 323 do { 324 *s1++ = *s2++; 325 } while (--n); 326 else { 327 s1 += n; 328 s2 += n; 329 do { 330 *--s1 = *--s2; 331 } while (--n); 332 } 333} 334#endif 335 336static void deletelines P((long,long)); 337static void finisheditline P((RILE*,FILE*,Iptr_type,struct hshentry const*)); 338static void insertline P((long,Iptr_type)); 339static void snapshotline P((FILE*,Iptr_type)); 340 341/* 342 * `line' contains pointers to the lines in the currently `edited' file. 343 * It is a 0-origin array that represents linelim-gapsize lines. 344 * line[0 .. gap-1] and line[gap+gapsize .. linelim-1] hold pointers to lines. 345 * line[gap .. gap+gapsize-1] contains garbage. 346 * 347 * Any @s in lines are duplicated. 348 * Lines are terminated by \n, or (for a last partial line only) by single @. 349 */ 350static Iptr_type *line; 351static size_t gap, gapsize, linelim; 352 353 static void 354insertline(n, l) 355 long n; 356 Iptr_type l; 357/* Before line N, insert line L. N is 0-origin. */ 358{ 359 if (linelim-gapsize < n) 360 editLineNumberOverflow(); 361 if (!gapsize) 362 line = 363 !linelim ? 364 tnalloc(Iptr_type, linelim = gapsize = 1024) 365 : ( 366 gap = gapsize = linelim, 367 trealloc(Iptr_type, line, linelim <<= 1) 368 ); 369 if (n < gap) 370 movelines(line+n+gapsize, line+n, gap-n); 371 else if (gap < n) 372 movelines(line+gap, line+gap+gapsize, n-gap); 373 374 line[n] = l; 375 gap = n + 1; 376 gapsize--; 377} 378 379 static void 380deletelines(n, nlines) 381 long n, nlines; 382/* Delete lines N through N+NLINES-1. N is 0-origin. */ 383{ 384 long l = n + nlines; 385 if (linelim-gapsize < l || l < n) 386 editLineNumberOverflow(); 387 if (l < gap) 388 movelines(line+l+gapsize, line+l, gap-l); 389 else if (gap < n) 390 movelines(line+gap, line+gap+gapsize, n-gap); 391 392 gap = n; 393 gapsize += nlines; 394} 395 396 static void 397snapshotline(f, l) 398 register FILE *f; 399 register Iptr_type l; 400{ 401 register int c; 402 do { 403 if ((c = *l++) == SDELIM && *l++ != SDELIM) 404 return; 405 aputc_(c, f) 406 } while (c != '\n'); 407} 408 409 void 410snapshotedit(f) 411 FILE *f; 412/* Copy the current state of the edits to F. */ 413{ 414 register Iptr_type *p, *lim, *l=line; 415 for (p=l, lim=l+gap; p<lim; ) 416 snapshotline(f, *p++); 417 for (p+=gapsize, lim=l+linelim; p<lim; ) 418 snapshotline(f, *p++); 419} 420 421 static void 422finisheditline(fin, fout, l, delta) 423 RILE *fin; 424 FILE *fout; 425 Iptr_type l; 426 struct hshentry const *delta; 427{ 428 fin->ptr = l; 429 if (expandline(fin, fout, delta, true, (FILE*)0, true) < 0) 430 faterror("finisheditline internal error"); 431} 432 433 void 434finishedit(delta, outfile, done) 435 struct hshentry const *delta; 436 FILE *outfile; 437 int done; 438/* 439 * Doing expansion if DELTA is set, output the state of the edits to OUTFILE. 440 * But do nothing unless DONE is set (which means we are on the last pass). 441 */ 442{ 443 if (done) { 444 openfcopy(outfile); 445 outfile = fcopy; 446 if (!delta) 447 snapshotedit(outfile); 448 else { 449 register Iptr_type *p, *lim, *l = line; 450 register RILE *fin = finptr; 451 Iptr_type here = fin->ptr; 452 for (p=l, lim=l+gap; p<lim; ) 453 finisheditline(fin, outfile, *p++, delta); 454 for (p+=gapsize, lim=l+linelim; p<lim; ) 455 finisheditline(fin, outfile, *p++, delta); 456 fin->ptr = here; 457 } 458 } 459} 460 461/* Open a temporary NAME for output, truncating any previous contents. */ 462# define fopen_update_truncate(name) fopenSafer(name, FOPEN_W_WORK) 463#else /* !large_memory */ 464 static FILE * fopen_update_truncate P((char const*)); 465 static FILE * 466fopen_update_truncate(name) 467 char const *name; 468{ 469 if (bad_fopen_wplus && un_link(name) != 0) 470 efaterror(name); 471 return fopenSafer(name, FOPEN_WPLUS_WORK); 472} 473#endif 474 475 476 void 477openfcopy(f) 478 FILE *f; 479{ 480 if (!(fcopy = f)) { 481 if (!resultname) 482 resultname = maketemp(2); 483 if (!(fcopy = fopen_update_truncate(resultname))) 484 efaterror(resultname); 485 } 486} 487 488 489#if !large_memory 490 491 static void swapeditfiles P((FILE*)); 492 static void 493swapeditfiles(outfile) 494 FILE *outfile; 495/* Function: swaps resultname and editname, assigns fedit=fcopy, 496 * and rewinds fedit for reading. Set fcopy to outfile if nonnull; 497 * otherwise, set fcopy to be resultname opened for reading and writing. 498 */ 499{ 500 char const *tmpptr; 501 502 editline = 0; linecorr = 0; 503 Orewind(fcopy); 504 fedit = fcopy; 505 tmpptr=editname; editname=resultname; resultname=tmpptr; 506 openfcopy(outfile); 507} 508 509 void 510snapshotedit(f) 511 FILE *f; 512/* Copy the current state of the edits to F. */ 513{ 514 finishedit((struct hshentry *)0, (FILE*)0, false); 515 fastcopy(fedit, f); 516 Irewind(fedit); 517} 518 519 void 520finishedit(delta, outfile, done) 521 struct hshentry const *delta; 522 FILE *outfile; 523 int done; 524/* copy the rest of the edit file and close it (if it exists). 525 * if delta, perform keyword substitution at the same time. 526 * If DONE is set, we are finishing the last pass. 527 */ 528{ 529 register RILE *fe; 530 register FILE *fc; 531 532 fe = fedit; 533 if (fe) { 534 fc = fcopy; 535 if (delta) { 536 while (1 < expandline(fe,fc,delta,false,(FILE*)0,true)) 537 ; 538 } else { 539 fastcopy(fe,fc); 540 } 541 Ifclose(fe); 542 } 543 if (!done) 544 swapeditfiles(outfile); 545} 546#endif 547 548 549 550#if large_memory 551# define copylines(upto,delta) (editline = (upto)) 552#else 553 static void copylines P((long,struct hshentry const*)); 554 static void 555copylines(upto, delta) 556 register long upto; 557 struct hshentry const *delta; 558/* 559 * Copy input lines editline+1..upto from fedit to fcopy. 560 * If delta, keyword expansion is done simultaneously. 561 * editline is updated. Rewinds a file only if necessary. 562 */ 563{ 564 register int c; 565 declarecache; 566 register FILE *fc; 567 register RILE *fe; 568 569 if (upto < editline) { 570 /* swap files */ 571 finishedit((struct hshentry *)0, (FILE*)0, false); 572 /* assumes edit only during last pass, from the beginning*/ 573 } 574 fe = fedit; 575 fc = fcopy; 576 if (editline < upto) 577 if (delta) 578 do { 579 if (expandline(fe,fc,delta,false,(FILE*)0,true) <= 1) 580 editLineNumberOverflow(); 581 } while (++editline < upto); 582 else { 583 setupcache(fe); cache(fe); 584 do { 585 do { 586 cachegeteof_(c, editLineNumberOverflow();) 587 aputc_(c, fc) 588 } while (c != '\n'); 589 } while (++editline < upto); 590 uncache(fe); 591 } 592} 593#endif 594 595 596 597 void 598xpandstring(delta) 599 struct hshentry const *delta; 600/* Function: Reads a string terminated by SDELIM from finptr and writes it 601 * to fcopy. Double SDELIM is replaced with single SDELIM. 602 * Keyword expansion is performed with data from delta. 603 * If foutptr is nonnull, the string is also copied unchanged to foutptr. 604 */ 605{ 606 while (1 < expandline(finptr,fcopy,delta,true,foutptr,true)) 607 continue; 608} 609 610 611 void 612copystring() 613/* Function: copies a string terminated with a single SDELIM from finptr to 614 * fcopy, replacing all double SDELIM with a single SDELIM. 615 * If foutptr is nonnull, the string also copied unchanged to foutptr. 616 * editline is incremented by the number of lines copied. 617 * Assumption: next character read is first string character. 618 */ 619{ register c; 620 declarecache; 621 register FILE *frew, *fcop; 622 register int amidline; 623 register RILE *fin; 624 625 fin = finptr; 626 setupcache(fin); cache(fin); 627 frew = foutptr; 628 fcop = fcopy; 629 amidline = false; 630 for (;;) { 631 GETC_(frew,c) 632 switch (c) { 633 case '\n': 634 ++editline; 635 ++rcsline; 636 amidline = false; 637 break; 638 case SDELIM: 639 GETC_(frew,c) 640 if (c != SDELIM) { 641 /* end of string */ 642 nextc = c; 643 editline += amidline; 644 uncache(fin); 645 return; 646 } 647 /* fall into */ 648 default: 649 amidline = true; 650 break; 651 } 652 aputc_(c,fcop) 653 } 654} 655 656 657 void 658enterstring() 659/* Like copystring, except the string is put into the edit data structure. */ 660{ 661#if !large_memory 662 editname = 0; 663 fedit = 0; 664 editline = linecorr = 0; 665 resultname = maketemp(1); 666 if (!(fcopy = fopen_update_truncate(resultname))) 667 efaterror(resultname); 668 copystring(); 669#else 670 register int c; 671 declarecache; 672 register FILE *frew; 673 register long e, oe; 674 register int amidline, oamidline; 675 register Iptr_type optr; 676 register RILE *fin; 677 678 e = 0; 679 gap = 0; 680 gapsize = linelim; 681 fin = finptr; 682 setupcache(fin); cache(fin); 683 advise_access(fin, MADV_NORMAL); 684 frew = foutptr; 685 amidline = false; 686 for (;;) { 687 optr = cacheptr(); 688 GETC_(frew,c) 689 oamidline = amidline; 690 oe = e; 691 switch (c) { 692 case '\n': 693 ++e; 694 ++rcsline; 695 amidline = false; 696 break; 697 case SDELIM: 698 GETC_(frew,c) 699 if (c != SDELIM) { 700 /* end of string */ 701 nextc = c; 702 editline = e + amidline; 703 linecorr = 0; 704 uncache(fin); 705 return; 706 } 707 /* fall into */ 708 default: 709 amidline = true; 710 break; 711 } 712 if (!oamidline) 713 insertline(oe, optr); 714 } 715#endif 716} 717 718 719 720 721 void 722#if large_memory 723edit_string() 724#else 725 editstring(delta) 726 struct hshentry const *delta; 727#endif 728/* 729 * Read an edit script from finptr and applies it to the edit file. 730#if !large_memory 731 * The result is written to fcopy. 732 * If delta, keyword expansion is performed simultaneously. 733 * If running out of lines in fedit, fedit and fcopy are swapped. 734 * editname is the name of the file that goes with fedit. 735#endif 736 * If foutptr is set, the edit script is also copied verbatim to foutptr. 737 * Assumes that all these files are open. 738 * resultname is the name of the file that goes with fcopy. 739 * Assumes the next input character from finptr is the first character of 740 * the edit script. Resets nextc on exit. 741 */ 742{ 743 int ed; /* editor command */ 744 register int c; 745 declarecache; 746 register FILE *frew; 747# if !large_memory 748 register FILE *f; 749 long line_lim = LONG_MAX; 750 register RILE *fe; 751# endif 752 register long i; 753 register RILE *fin; 754# if large_memory 755 register long j; 756# endif 757 struct diffcmd dc; 758 759 editline += linecorr; linecorr=0; /*correct line number*/ 760 frew = foutptr; 761 fin = finptr; 762 setupcache(fin); 763 initdiffcmd(&dc); 764 while (0 <= (ed = getdiffcmd(fin,true,frew,&dc))) 765#if !large_memory 766 if (line_lim <= dc.line1) 767 editLineNumberOverflow(); 768 else 769#endif 770 if (!ed) { 771 copylines(dc.line1-1, delta); 772 /* skip over unwanted lines */ 773 i = dc.nlines; 774 linecorr -= i; 775 editline += i; 776# if large_memory 777 deletelines(editline+linecorr, i); 778# else 779 fe = fedit; 780 do { 781 /*skip next line*/ 782 do { 783 Igeteof_(fe, c, { if (i!=1) editLineNumberOverflow(); line_lim = dc.dafter; break; } ) 784 } while (c != '\n'); 785 } while (--i); 786# endif 787 } else { 788 /* Copy lines without deleting any. */ 789 copylines(dc.line1, delta); 790 i = dc.nlines; 791# if large_memory 792 j = editline+linecorr; 793# endif 794 linecorr += i; 795#if !large_memory 796 f = fcopy; 797 if (delta) 798 do { 799 switch (expandline(fin,f,delta,true,frew,true)){ 800 case 0: case 1: 801 if (i==1) 802 return; 803 /* fall into */ 804 case -1: 805 editEndsPrematurely(); 806 } 807 } while (--i); 808 else 809#endif 810 { 811 cache(fin); 812 do { 813# if large_memory 814 insertline(j++, cacheptr()); 815# endif 816 for (;;) { 817 GETC_(frew, c) 818 if (c==SDELIM) { 819 GETC_(frew, c) 820 if (c!=SDELIM) { 821 if (--i) 822 editEndsPrematurely(); 823 nextc = c; 824 uncache(fin); 825 return; 826 } 827 } 828# if !large_memory 829 aputc_(c, f) 830# endif 831 if (c == '\n') 832 break; 833 } 834 ++rcsline; 835 } while (--i); 836 uncache(fin); 837 } 838 } 839} 840 841 842 843/* The rest is for keyword expansion */ 844 845 846 847 int 848expandline(infile, outfile, delta, delimstuffed, frewfile, dolog) 849 RILE *infile; 850 FILE *outfile, *frewfile; 851 struct hshentry const *delta; 852 int delimstuffed, dolog; 853/* 854 * Read a line from INFILE and write it to OUTFILE. 855 * Do keyword expansion with data from DELTA. 856 * If DELIMSTUFFED is true, double SDELIM is replaced with single SDELIM. 857 * If FREWFILE is set, copy the line unchanged to FREWFILE. 858 * DELIMSTUFFED must be true if FREWFILE is set. 859 * Append revision history to log only if DOLOG is set. 860 * Yields -1 if no data is copied, 0 if an incomplete line is copied, 861 * 2 if a complete line is copied; adds 1 to yield if expansion occurred. 862 */ 863{ 864 register c; 865 declarecache; 866 register FILE *out, *frew; 867 register char * tp; 868 register int e, ds, r; 869 char const *tlim; 870 static struct buf keyval; 871 enum markers matchresult; 872 873 setupcache(infile); cache(infile); 874 out = outfile; 875 frew = frewfile; 876 ds = delimstuffed; 877 bufalloc(&keyval, keylength+3); 878 e = 0; 879 r = -1; 880 881 for (;;) { 882 if (ds) 883 GETC_(frew, c) 884 else 885 cachegeteof_(c, goto uncache_exit;) 886 for (;;) { 887 switch (c) { 888 case SDELIM: 889 if (ds) { 890 GETC_(frew, c) 891 if (c != SDELIM) { 892 /* end of string */ 893 nextc=c; 894 goto uncache_exit; 895 } 896 } 897 /* fall into */ 898 default: 899 aputc_(c,out) 900 r = 0; 901 break; 902 903 case '\n': 904 rcsline += ds; 905 aputc_(c,out) 906 r = 2; 907 goto uncache_exit; 908 909 case KDELIM: 910 r = 0; 911 /* check for keyword */ 912 /* first, copy a long enough string into keystring */ 913 tp = keyval.string; 914 *tp++ = KDELIM; 915 for (;;) { 916 if (ds) 917 GETC_(frew, c) 918 else 919 cachegeteof_(c, goto keystring_eof;) 920 if (tp <= &keyval.string[keylength]) 921 switch (ctab[c]) { 922 case LETTER: case Letter: 923 *tp++ = c; 924 continue; 925 default: 926 break; 927 } 928 break; 929 } 930 *tp++ = c; *tp = '\0'; 931 matchresult = trymatch(keyval.string+1); 932 if (matchresult==Nomatch) { 933 tp[-1] = 0; 934 aputs(keyval.string, out); 935 continue; /* last c handled properly */ 936 } 937 938 /* Now we have a keyword terminated with a K/VDELIM */ 939 if (c==VDELIM) { 940 /* try to find closing KDELIM, and replace value */ 941 tlim = keyval.string + keyval.size; 942 for (;;) { 943 if (ds) 944 GETC_(frew, c) 945 else 946 cachegeteof_(c, goto keystring_eof;) 947 if (c=='\n' || c==KDELIM) 948 break; 949 *tp++ =c; 950 if (tlim <= tp) 951 tp = bufenlarge(&keyval, &tlim); 952 if (c==SDELIM && ds) { /*skip next SDELIM */ 953 GETC_(frew, c) 954 if (c != SDELIM) { 955 /* end of string before closing KDELIM or newline */ 956 nextc = c; 957 goto keystring_eof; 958 } 959 } 960 } 961 if (c!=KDELIM) { 962 /* couldn't find closing KDELIM -- give up */ 963 *tp = 0; 964 aputs(keyval.string, out); 965 continue; /* last c handled properly */ 966 } 967 } 968 /* now put out the new keyword value */ 969 uncache(infile); 970 keyreplace(matchresult, delta, ds, infile, out, dolog); 971 cache(infile); 972 e = 1; 973 break; 974 } 975 break; 976 } 977 } 978 979 keystring_eof: 980 *tp = 0; 981 aputs(keyval.string, out); 982 uncache_exit: 983 uncache(infile); 984 return r + e; 985} 986 987 988 static void 989escape_string(out, s) 990 register FILE *out; 991 register char const *s; 992/* Output to OUT the string S, escaping chars that would break `ci -k'. */ 993{ 994 register char c; 995 for (;;) 996 switch ((c = *s++)) { 997 case 0: return; 998 case '\t': aputs("\\t", out); break; 999 case '\n': aputs("\\n", out); break; 1000 case ' ': aputs("\\040", out); break; 1001 case KDELIM: aputs("\\044", out); break; 1002 case '\\': if (VERSION(5)<=RCSversion) {aputs("\\\\", out); break;} 1003 /* fall into */ 1004 default: aputc_(c, out) break; 1005 } 1006} 1007 1008char const ciklog[ciklogsize] = "checked in with -k by "; 1009 1010 static void 1011keyreplace(marker, delta, delimstuffed, infile, out, dolog) 1012 enum markers marker; 1013 register struct hshentry const *delta; 1014 int delimstuffed; 1015 RILE *infile; 1016 register FILE *out; 1017 int dolog; 1018/* function: outputs the keyword value(s) corresponding to marker. 1019 * Attributes are derived from delta. 1020 */ 1021{ 1022 register char const *sp, *cp, *date; 1023 register int c; 1024 register size_t cs, cw, ls; 1025 char const *sp1; 1026 char datebuf[datesize + zonelenmax]; 1027 int RCSv; 1028 int exp; 1029 1030 sp = Keyword[(int)marker]; 1031 exp = Expand; 1032 date = delta->date; 1033 RCSv = RCSversion; 1034 1035 if (exp != VAL_EXPAND) 1036 aprintf(out, "%c%s", KDELIM, sp); 1037 if (exp != KEY_EXPAND) { 1038 1039 if (exp != VAL_EXPAND) 1040 aprintf(out, "%c%c", VDELIM, 1041 marker==Log && RCSv<VERSION(5) ? '\t' : ' ' 1042 ); 1043 1044 switch (marker) { 1045 case Author: 1046 aputs(delta->author, out); 1047 break; 1048 case Date: 1049 aputs(date2str(date,datebuf), out); 1050 break; 1051 case Id: 1052 case LocalId: 1053 case Header: 1054 case CVSHeader: 1055 if (marker == Id || RCSv < VERSION(4) || 1056 (marker == LocalId && LocalIdMode == Id)) 1057 escape_string(out, basefilename(RCSname)); 1058 else if (marker == CVSHeader || 1059 (marker == LocalId && LocalIdMode == CVSHeader)) 1060 escape_string(out, getfullCVSname()); 1061 else 1062 escape_string(out, getfullRCSname()); 1063 aprintf(out, " %s %s %s %s", 1064 delta->num, 1065 date2str(date, datebuf), 1066 delta->author, 1067 RCSv==VERSION(3) && delta->lockedby ? "Locked" 1068 : delta->state 1069 ); 1070 if (delta->lockedby) 1071 if (VERSION(5) <= RCSv) { 1072 if (locker_expansion || exp==KEYVALLOCK_EXPAND) 1073 aprintf(out, " %s", delta->lockedby); 1074 } else if (RCSv == VERSION(4)) 1075 aprintf(out, " Locker: %s", delta->lockedby); 1076 break; 1077 case Locker: 1078 if (delta->lockedby) 1079 if ( 1080 locker_expansion 1081 || exp == KEYVALLOCK_EXPAND 1082 || RCSv <= VERSION(4) 1083 ) 1084 aputs(delta->lockedby, out); 1085 break; 1086 case Log: 1087 case RCSfile: 1088 escape_string(out, basefilename(RCSname)); 1089 break; 1090 case Name: 1091 if (delta->name) 1092 aputs(delta->name, out); 1093 break; 1094 case Revision: 1095 aputs(delta->num, out); 1096 break; 1097 case Source: 1098 escape_string(out, getfullRCSname()); 1099 break; 1100 case State: 1101 aputs(delta->state, out); 1102 break; 1103 default: 1104 break; 1105 } 1106 if (exp != VAL_EXPAND) 1107 afputc(' ', out); 1108 } 1109 if (exp != VAL_EXPAND) 1110 afputc(KDELIM, out); 1111 1112 if (marker == Log && dolog) { 1113 struct buf leader; 1114 1115 sp = delta->log.string; 1116 ls = delta->log.size; 1117 if (sizeof(ciklog)-1<=ls && !memcmp(sp,ciklog,sizeof(ciklog)-1)) 1118 return; 1119 bufautobegin(&leader); 1120 if (RCSversion < VERSION(5)) { 1121 cp = Comment.string; 1122 cs = Comment.size; 1123 } else { 1124 int kdelim_found = 0; 1125 Ioffset_type chars_read = Itell(infile); 1126 declarecache; 1127 setupcache(infile); cache(infile); 1128 1129 c = 0; /* Pacify `gcc -Wall'. */ 1130 1131 /* 1132 * Back up to the start of the current input line, 1133 * setting CS to the number of characters before `$Log'. 1134 */ 1135 cs = 0; 1136 for (;;) { 1137 if (!--chars_read) 1138 goto done_backing_up; 1139 cacheunget_(infile, c) 1140 if (c == '\n') 1141 break; 1142 if (c == SDELIM && delimstuffed) { 1143 if (!--chars_read) 1144 break; 1145 cacheunget_(infile, c) 1146 if (c != SDELIM) { 1147 cacheget_(c) 1148 break; 1149 } 1150 } 1151 cs += kdelim_found; 1152 kdelim_found |= c==KDELIM; 1153 } 1154 cacheget_(c) 1155 done_backing_up:; 1156 1157 /* Copy characters before `$Log' into LEADER. */ 1158 bufalloc(&leader, cs); 1159 cp = leader.string; 1160 for (cw = 0; cw < cs; cw++) { 1161 leader.string[cw] = c; 1162 if (c == SDELIM && delimstuffed) 1163 cacheget_(c) 1164 cacheget_(c) 1165 } 1166 1167 /* Convert traditional C or Pascal leader to ` *'. */ 1168 for (cw = 0; cw < cs; cw++) 1169 if (ctab[(unsigned char) cp[cw]] != SPACE) 1170 break; 1171 if ( 1172 cw+1 < cs 1173 && cp[cw+1] == '*' 1174 && (cp[cw] == '/' || cp[cw] == '(') 1175 ) { 1176 size_t i = cw+1; 1177 for (;;) 1178 if (++i == cs) { 1179 warn( 1180 "`%c* $Log' is obsolescent; use ` * $Log'.", 1181 cp[cw] 1182 ); 1183 leader.string[cw] = ' '; 1184 break; 1185 } else if (ctab[(unsigned char) cp[i]] != SPACE) 1186 break; 1187 } 1188 1189 /* Skip `$Log ... $' string. */ 1190 do { 1191 cacheget_(c) 1192 } while (c != KDELIM); 1193 uncache(infile); 1194 } 1195 afputc('\n', out); 1196 awrite(cp, cs, out); 1197 sp1 = date2str(date, datebuf); 1198 if (VERSION(5) <= RCSv) { 1199 aprintf(out, "Revision %s %s %s", 1200 delta->num, sp1, delta->author 1201 ); 1202 } else { 1203 /* oddity: 2 spaces between date and time, not 1 as usual */ 1204 sp1 = strchr(sp1, ' '); 1205 aprintf(out, "Revision %s %.*s %s %s", 1206 delta->num, (int)(sp1-datebuf), datebuf, sp1, 1207 delta->author 1208 ); 1209 } 1210 /* Do not include state: it may change and is not updated. */ 1211 cw = cs; 1212 if (VERSION(5) <= RCSv) 1213 for (; cw && (cp[cw-1]==' ' || cp[cw-1]=='\t'); --cw) 1214 continue; 1215 for (;;) { 1216 afputc('\n', out); 1217 awrite(cp, cw, out); 1218 if (!ls) 1219 break; 1220 --ls; 1221 c = *sp++; 1222 if (c != '\n') { 1223 awrite(cp+cw, cs-cw, out); 1224 do { 1225 afputc(c,out); 1226 if (!ls) 1227 break; 1228 --ls; 1229 c = *sp++; 1230 } while (c != '\n'); 1231 } 1232 } 1233 bufautoend(&leader); 1234 } 1235} 1236 1237#if has_readlink 1238 static int resolve_symlink P((struct buf*)); 1239 static int 1240resolve_symlink(L) 1241 struct buf *L; 1242/* 1243 * If L is a symbolic link, resolve it to the name that it points to. 1244 * If unsuccessful, set errno and yield -1. 1245 * If it points to an existing file, yield 1. 1246 * Otherwise, set errno=ENOENT and yield 0. 1247 */ 1248{ 1249 char *b, a[SIZEABLE_PATH]; 1250 int e; 1251 size_t s; 1252 ssize_t r; 1253 struct buf bigbuf; 1254 int linkcount = MAXSYMLINKS; 1255 1256 b = a; 1257 s = sizeof(a); 1258 bufautobegin(&bigbuf); 1259 while ((r = readlink(L->string,b,s)) != -1) 1260 if (r == s) { 1261 bufalloc(&bigbuf, s<<1); 1262 b = bigbuf.string; 1263 s = bigbuf.size; 1264 } else if (!linkcount--) { 1265# ifndef ELOOP 1266 /* 1267 * Some pedantic Posix 1003.1-1990 hosts have readlink 1268 * but not ELOOP. Approximate ELOOP with EMLINK. 1269 */ 1270# define ELOOP EMLINK 1271# endif 1272 errno = ELOOP; 1273 return -1; 1274 } else { 1275 /* Splice symbolic link into L. */ 1276 b[r] = '\0'; 1277 L->string[ 1278 ROOTPATH(b) ? 0 : basefilename(L->string) - L->string 1279 ] = '\0'; 1280 bufscat(L, b); 1281 } 1282 e = errno; 1283 bufautoend(&bigbuf); 1284 errno = e; 1285 switch (e) { 1286 case readlink_isreg_errno: return 1; 1287 case ENOENT: return 0; 1288 default: return -1; 1289 } 1290} 1291#endif 1292 1293 RILE * 1294rcswriteopen(RCSbuf, status, mustread) 1295 struct buf *RCSbuf; 1296 struct stat *status; 1297 int mustread; 1298/* 1299 * Create the lock file corresponding to RCSBUF. 1300 * Then try to open RCSBUF for reading and yield its RILE* descriptor. 1301 * Put its status into *STATUS too. 1302 * MUSTREAD is true if the file must already exist, too. 1303 * If all goes well, discard any previously acquired locks, 1304 * and set fdlock to the file descriptor of the RCS lockfile. 1305 */ 1306{ 1307 register char *tp; 1308 register char const *sp, *RCSpath, *x; 1309 RILE *f; 1310 size_t l; 1311 int e, exists, fdesc, fdescSafer, r, waslocked; 1312 struct buf *dirt; 1313 struct stat statbuf; 1314 1315 waslocked = 0 <= fdlock; 1316 exists = 1317# if has_readlink 1318 resolve_symlink(RCSbuf); 1319# else 1320 stat(RCSbuf->string, &statbuf) == 0 ? 1 1321 : errno==ENOENT ? 0 : -1; 1322# endif 1323 if (exists < (mustread|waslocked)) 1324 /* 1325 * There's an unusual problem with the RCS file; 1326 * or the RCS file doesn't exist, 1327 * and we must read or we already have a lock elsewhere. 1328 */ 1329 return 0; 1330 1331 RCSpath = RCSbuf->string; 1332 sp = basefilename(RCSpath); 1333 l = sp - RCSpath; 1334 dirt = &dirtpname[waslocked]; 1335 bufscpy(dirt, RCSpath); 1336 tp = dirt->string + l; 1337 x = rcssuffix(RCSpath); 1338# if has_readlink 1339 if (!x) { 1340 error("symbolic link to non RCS file `%s'", RCSpath); 1341 errno = EINVAL; 1342 return 0; 1343 } 1344# endif 1345 if (*sp == *x) { 1346 error("RCS pathname `%s' incompatible with suffix `%s'", sp, x); 1347 errno = EINVAL; 1348 return 0; 1349 } 1350 /* Create a lock filename that is a function of the RCS filename. */ 1351 if (*x) { 1352 /* 1353 * The suffix is nonempty. 1354 * The lock filename is the first char of of the suffix, 1355 * followed by the RCS filename with last char removed. E.g.: 1356 * foo,v RCS filename with suffix ,v 1357 * ,foo, lock filename 1358 */ 1359 *tp++ = *x; 1360 while (*sp) 1361 *tp++ = *sp++; 1362 *--tp = 0; 1363 } else { 1364 /* 1365 * The suffix is empty. 1366 * The lock filename is the RCS filename 1367 * with last char replaced by '_'. 1368 */ 1369 while ((*tp++ = *sp++)) 1370 continue; 1371 tp -= 2; 1372 if (*tp == '_') { 1373 error("RCS pathname `%s' ends with `%c'", RCSpath, *tp); 1374 errno = EINVAL; 1375 return 0; 1376 } 1377 *tp = '_'; 1378 } 1379 1380 sp = dirt->string; 1381 1382 f = 0; 1383 1384 /* 1385 * good news: 1386 * open(f, O_CREAT|O_EXCL|O_TRUNC|..., OPEN_CREAT_READONLY) 1387 * is atomic according to Posix 1003.1-1990. 1388 * bad news: 1389 * NFS ignores O_EXCL and doesn't comply with Posix 1003.1-1990. 1390 * good news: 1391 * (O_TRUNC,OPEN_CREAT_READONLY) normally guarantees atomicity 1392 * even with NFS. 1393 * bad news: 1394 * If you're root, (O_TRUNC,OPEN_CREAT_READONLY) doesn't 1395 * guarantee atomicity. 1396 * good news: 1397 * Root-over-the-wire NFS access is rare for security reasons. 1398 * This bug has never been reported in practice with RCS. 1399 * So we don't worry about this bug. 1400 * 1401 * An even rarer NFS bug can occur when clients retry requests. 1402 * This can happen in the usual case of NFS over UDP. 1403 * Suppose client A releases a lock by renaming ",f," to "f,v" at 1404 * about the same time that client B obtains a lock by creating ",f,", 1405 * and suppose A's first rename request is delayed, so A reissues it. 1406 * The sequence of events might be: 1407 * A sends rename(",f,", "f,v") 1408 * B sends create(",f,") 1409 * A sends retry of rename(",f,", "f,v") 1410 * server receives, does, and acknowledges A's first rename() 1411 * A receives acknowledgment, and its RCS program exits 1412 * server receives, does, and acknowledges B's create() 1413 * server receives, does, and acknowledges A's retry of rename() 1414 * This not only wrongly deletes B's lock, it removes the RCS file! 1415 * Most NFS implementations have idempotency caches that usually prevent 1416 * this scenario, but such caches are finite and can be overrun. 1417 * This problem afflicts not only RCS, which uses open() and rename() 1418 * to get and release locks; it also afflicts the traditional 1419 * Unix method of using link() and unlink() to get and release locks, 1420 * and the less traditional method of using mkdir() and rmdir(). 1421 * There is no easy workaround. 1422 * Any new method based on lockf() seemingly would be incompatible with 1423 * the old methods; besides, lockf() is notoriously buggy under NFS. 1424 * Since this problem afflicts scads of Unix programs, but is so rare 1425 * that nobody seems to be worried about it, we won't worry either. 1426 */ 1427# if !open_can_creat 1428# define create(f) creat(f, OPEN_CREAT_READONLY) 1429# else 1430# define create(f) open(f, OPEN_O_BINARY|OPEN_O_LOCK|OPEN_O_WRONLY|O_CREAT|O_EXCL|O_TRUNC, OPEN_CREAT_READONLY) 1431# endif 1432 1433 catchints(); 1434 ignoreints(); 1435 1436 /* 1437 * Create a lock file for an RCS file. This should be atomic, i.e. 1438 * if two processes try it simultaneously, at most one should succeed. 1439 */ 1440 seteid(); 1441 fdesc = create(sp); 1442 fdescSafer = fdSafer(fdesc); /* Do it now; setrid might use stderr. */ 1443 e = errno; 1444 setrid(); 1445 1446 if (0 <= fdesc) 1447 dirtpmaker[0] = effective; 1448 1449 if (fdescSafer < 0) { 1450 if (e == EACCES && stat(sp,&statbuf) == 0) 1451 /* The RCS file is busy. */ 1452 e = EEXIST; 1453 } else { 1454 e = ENOENT; 1455 if (exists) { 1456 f = Iopen(RCSpath, FOPEN_RB, status); 1457 e = errno; 1458 if (f && waslocked) { 1459 /* Discard the previous lock in favor of this one. */ 1460 ORCSclose(); 1461 seteid(); 1462 r = un_link(lockname); 1463 e = errno; 1464 setrid(); 1465 if (r != 0) 1466 enfaterror(e, lockname); 1467 bufscpy(&dirtpname[lockdirtp_index], sp); 1468 } 1469 } 1470 fdlock = fdescSafer; 1471 } 1472 1473 restoreints(); 1474 1475 errno = e; 1476 return f; 1477} 1478 1479 void 1480keepdirtemp(name) 1481 char const *name; 1482/* Do not unlink name, either because it's not there any more, 1483 * or because it has already been unlinked. 1484 */ 1485{ 1486 register int i; 1487 for (i=DIRTEMPNAMES; 0<=--i; ) 1488 if (dirtpname[i].string == name) { 1489 dirtpmaker[i] = notmade; 1490 return; 1491 } 1492 faterror("keepdirtemp"); 1493} 1494 1495 char const * 1496makedirtemp(isworkfile) 1497 int isworkfile; 1498/* 1499 * Create a unique pathname and store it into dirtpname. 1500 * Because of storage in tpnames, dirtempunlink() can unlink the file later. 1501 * Return a pointer to the pathname created. 1502 * If ISWORKFILE is 1, put it into the working file's directory; 1503 * if 0, put the unique file in RCSfile's directory. 1504 */ 1505{ 1506 register char *tp, *np; 1507 register size_t dl; 1508 register struct buf *bn; 1509 register char const *name = isworkfile ? workname : RCSname; 1510# if has_mktemp 1511 int fd; 1512# endif 1513 1514 dl = basefilename(name) - name; 1515 bn = &dirtpname[newRCSdirtp_index + isworkfile]; 1516 bufalloc(bn, 1517# if has_mktemp 1518 dl + 9 1519# else 1520 strlen(name) + 3 1521# endif 1522 ); 1523 bufscpy(bn, name); 1524 np = tp = bn->string; 1525 tp += dl; 1526 *tp++ = '_'; 1527 *tp++ = '0'+isworkfile; 1528 catchints(); 1529# if has_mktemp 1530 VOID strcpy(tp, "XXXXXX"); 1531 fd = mkstemp(np); 1532 if (fd < 0 || !*np) 1533 faterror("can't make temporary pathname `%.*s_%cXXXXXX'", 1534 (int)dl, name, '0'+isworkfile 1535 ); 1536 close(fd); 1537# else 1538 /* 1539 * Posix 1003.1-1990 has no reliable way 1540 * to create a unique file in a named directory. 1541 * We fudge here. If the filename is abcde, 1542 * the temp filename is _Ncde where N is a digit. 1543 */ 1544 name += dl; 1545 if (*name) name++; 1546 if (*name) name++; 1547 VOID strcpy(tp, name); 1548# endif 1549 dirtpmaker[newRCSdirtp_index + isworkfile] = real; 1550 return np; 1551} 1552 1553 void 1554dirtempunlink() 1555/* Clean up makedirtemp() files. May be invoked by signal handler. */ 1556{ 1557 register int i; 1558 enum maker m; 1559 1560 for (i = DIRTEMPNAMES; 0 <= --i; ) 1561 if ((m = dirtpmaker[i]) != notmade) { 1562 if (m == effective) 1563 seteid(); 1564 VOID un_link(dirtpname[i].string); 1565 if (m == effective) 1566 setrid(); 1567 dirtpmaker[i] = notmade; 1568 } 1569} 1570 1571 1572 int 1573#if has_prototypes 1574chnamemod( 1575 FILE **fromp, char const *from, char const *to, 1576 int set_mode, mode_t mode, time_t mtime 1577) 1578 /* The `#if has_prototypes' is needed because mode_t might promote to int. */ 1579#else 1580 chnamemod(fromp, from, to, set_mode, mode, mtime) 1581 FILE **fromp; char const *from,*to; 1582 int set_mode; mode_t mode; time_t mtime; 1583#endif 1584/* 1585 * Rename a file (with stream pointer *FROMP) from FROM to TO. 1586 * FROM already exists. 1587 * If 0 < SET_MODE, change the mode to MODE, before renaming if possible. 1588 * If MTIME is not -1, change its mtime to MTIME before renaming. 1589 * Close and clear *FROMP before renaming it. 1590 * Unlink TO if it already exists. 1591 * Return -1 on error (setting errno), 0 otherwise. 1592 */ 1593{ 1594 mode_t mode_while_renaming = mode; 1595 int fchmod_set_mode = 0; 1596 1597# if bad_a_rename || bad_NFS_rename 1598 struct stat st; 1599 if (bad_NFS_rename || (bad_a_rename && set_mode <= 0)) { 1600 if (fstat(fileno(*fromp), &st) != 0) 1601 return -1; 1602 if (bad_a_rename && set_mode <= 0) 1603 mode = st.st_mode; 1604 } 1605# endif 1606 1607# if bad_a_rename 1608 /* 1609 * There's a short window of inconsistency 1610 * during which the lock file is writable. 1611 */ 1612 mode_while_renaming = mode|S_IWUSR; 1613 if (mode != mode_while_renaming) 1614 set_mode = 1; 1615# endif 1616 1617# if has_fchmod 1618 if (0<set_mode && fchmod(fileno(*fromp),mode_while_renaming) == 0) 1619 fchmod_set_mode = set_mode; 1620# endif 1621 /* If bad_chmod_close, we must close before chmod. */ 1622 Ozclose(fromp); 1623 if (fchmod_set_mode<set_mode && chmod(from, mode_while_renaming) != 0) 1624 return -1; 1625 1626 if (setmtime(from, mtime) != 0) 1627 return -1; 1628 1629# if !has_rename || bad_b_rename 1630 /* 1631 * There's a short window of inconsistency 1632 * during which TO does not exist. 1633 */ 1634 if (un_link(to) != 0 && errno != ENOENT) 1635 return -1; 1636# endif 1637 1638# if has_rename 1639 if (rename(from,to) != 0 && !(has_NFS && errno==ENOENT)) 1640 return -1; 1641# else 1642 if (do_link(from,to) != 0 || un_link(from) != 0) 1643 return -1; 1644# endif 1645 1646# if bad_NFS_rename 1647 { 1648 /* 1649 * Check whether the rename falsely reported success. 1650 * A race condition can occur between the rename and the stat. 1651 */ 1652 struct stat tostat; 1653 if (stat(to, &tostat) != 0) 1654 return -1; 1655 if (! same_file(st, tostat, 0)) { 1656 errno = EIO; 1657 return -1; 1658 } 1659 } 1660# endif 1661 1662# if bad_a_rename 1663 if (0 < set_mode && chmod(to, mode) != 0) 1664 return -1; 1665# endif 1666 1667 return 0; 1668} 1669 1670 int 1671setmtime(file, mtime) 1672 char const *file; 1673 time_t mtime; 1674/* Set FILE's last modified time to MTIME, but do nothing if MTIME is -1. */ 1675{ 1676 static struct utimbuf amtime; /* static so unused fields are zero */ 1677 if (mtime == -1) 1678 return 0; 1679 amtime.actime = now(); 1680 amtime.modtime = mtime; 1681 return utime(file, &amtime); 1682} 1683 1684 1685 1686 int 1687findlock(delete, target) 1688 int delete; 1689 struct hshentry **target; 1690/* 1691 * Find the first lock held by caller and return a pointer 1692 * to the locked delta; also removes the lock if DELETE. 1693 * If one lock, put it into *TARGET. 1694 * Return 0 for no locks, 1 for one, 2 for two or more. 1695 */ 1696{ 1697 register struct rcslock *next, **trail, **found; 1698 1699 found = 0; 1700 for (trail = &Locks; (next = *trail); trail = &next->nextlock) 1701 if (strcmp(getcaller(), next->login) == 0) { 1702 if (found) { 1703 rcserror("multiple revisions locked by %s; please specify one", getcaller()); 1704 return 2; 1705 } 1706 found = trail; 1707 } 1708 if (!found) 1709 return 0; 1710 next = *found; 1711 *target = next->delta; 1712 if (delete) { 1713 next->delta->lockedby = 0; 1714 *found = next->nextlock; 1715 } 1716 return 1; 1717} 1718 1719 int 1720addlock(delta, verbose) 1721 struct hshentry * delta; 1722 int verbose; 1723/* 1724 * Add a lock held by caller to DELTA and yield 1 if successful. 1725 * Print an error message if verbose and yield -1 if no lock is added because 1726 * DELTA is locked by somebody other than caller. 1727 * Return 0 if the caller already holds the lock. 1728 */ 1729{ 1730 register struct rcslock *next; 1731 1732 for (next = Locks; next; next = next->nextlock) 1733 if (cmpnum(delta->num, next->delta->num) == 0) 1734 if (strcmp(getcaller(), next->login) == 0) 1735 return 0; 1736 else { 1737 if (verbose) 1738 rcserror("Revision %s is already locked by %s.", 1739 delta->num, next->login 1740 ); 1741 return -1; 1742 } 1743 next = ftalloc(struct rcslock); 1744 delta->lockedby = next->login = getcaller(); 1745 next->delta = delta; 1746 next->nextlock = Locks; 1747 Locks = next; 1748 return 1; 1749} 1750 1751 1752 int 1753addsymbol(num, name, rebind) 1754 char const *num, *name; 1755 int rebind; 1756/* 1757 * Associate with revision NUM the new symbolic NAME. 1758 * If NAME already exists and REBIND is set, associate NAME with NUM; 1759 * otherwise, print an error message and return false; 1760 * Return -1 if unsuccessful, 0 if no change, 1 if change. 1761 */ 1762{ 1763 register struct assoc *next; 1764 1765 for (next = Symbols; next; next = next->nextassoc) 1766 if (strcmp(name, next->symbol) == 0) 1767 if (strcmp(next->num,num) == 0) 1768 return 0; 1769 else if (rebind) { 1770 next->num = num; 1771 return 1; 1772 } else { 1773 rcserror("symbolic name %s already bound to %s", 1774 name, next->num 1775 ); 1776 return -1; 1777 } 1778 next = ftalloc(struct assoc); 1779 next->symbol = name; 1780 next->num = num; 1781 next->nextassoc = Symbols; 1782 Symbols = next; 1783 return 1; 1784} 1785 1786 1787 1788 char const * 1789getcaller() 1790/* Get the caller's login name. */ 1791{ 1792# if has_setuid 1793 return getusername(euid()!=ruid()); 1794# else 1795 return getusername(false); 1796# endif 1797} 1798 1799 1800 int 1801checkaccesslist() 1802/* 1803 * Return true if caller is the superuser, the owner of the 1804 * file, the access list is empty, or caller is on the access list. 1805 * Otherwise, print an error message and return false. 1806 */ 1807{ 1808 register struct access const *next; 1809 1810 if (!AccessList || myself(RCSstat.st_uid) || strcmp(getcaller(),"root")==0) 1811 return true; 1812 1813 next = AccessList; 1814 do { 1815 if (strcmp(getcaller(), next->login) == 0) 1816 return true; 1817 } while ((next = next->nextaccess)); 1818 1819 rcserror("user %s not on the access list", getcaller()); 1820 return false; 1821} 1822 1823 1824 int 1825dorewrite(lockflag, changed) 1826 int lockflag, changed; 1827/* 1828 * Do nothing if LOCKFLAG is zero. 1829 * Prepare to rewrite an RCS file if CHANGED is positive. 1830 * Stop rewriting if CHANGED is zero, because there won't be any changes. 1831 * Fail if CHANGED is negative. 1832 * Return 0 on success, -1 on failure. 1833 */ 1834{ 1835 int r = 0, e; 1836 1837 if (lockflag) 1838 if (changed) { 1839 if (changed < 0) 1840 return -1; 1841 putadmin(); 1842 puttree(Head, frewrite); 1843 aprintf(frewrite, "\n\n%s%c", Kdesc, nextc); 1844 foutptr = frewrite; 1845 } else { 1846# if bad_creat0 1847 int nr = !!frewrite, ne = 0; 1848# endif 1849 ORCSclose(); 1850 seteid(); 1851 ignoreints(); 1852# if bad_creat0 1853 if (nr) { 1854 nr = un_link(newRCSname); 1855 ne = errno; 1856 keepdirtemp(newRCSname); 1857 } 1858# endif 1859 r = un_link(lockname); 1860 e = errno; 1861 keepdirtemp(lockname); 1862 restoreints(); 1863 setrid(); 1864 if (r != 0) 1865 enerror(e, lockname); 1866# if bad_creat0 1867 if (nr != 0) { 1868 enerror(ne, newRCSname); 1869 r = -1; 1870 } 1871# endif 1872 } 1873 return r; 1874} 1875 1876 int 1877donerewrite(changed, newRCStime) 1878 int changed; 1879 time_t newRCStime; 1880/* 1881 * Finish rewriting an RCS file if CHANGED is nonzero. 1882 * Set its mode if CHANGED is positive. 1883 * Set its modification time to NEWRCSTIME unless it is -1. 1884 * Return 0 on success, -1 on failure. 1885 */ 1886{ 1887 int r = 0, e = 0; 1888# if bad_creat0 1889 int lr, le; 1890# endif 1891 1892 if (changed && !nerror) { 1893 if (finptr) { 1894 fastcopy(finptr, frewrite); 1895 Izclose(&finptr); 1896 } 1897 if (1 < RCSstat.st_nlink) 1898 rcswarn("breaking hard link"); 1899 aflush(frewrite); 1900 seteid(); 1901 ignoreints(); 1902 r = chnamemod( 1903 &frewrite, newRCSname, RCSname, changed, 1904 RCSstat.st_mode & (mode_t)~(S_IWUSR|S_IWGRP|S_IWOTH), 1905 newRCStime 1906 ); 1907 e = errno; 1908 keepdirtemp(newRCSname); 1909# if bad_creat0 1910 lr = un_link(lockname); 1911 le = errno; 1912 keepdirtemp(lockname); 1913# endif 1914 restoreints(); 1915 setrid(); 1916 if (r != 0) { 1917 enerror(e, RCSname); 1918 error("saved in %s", newRCSname); 1919 } 1920# if bad_creat0 1921 if (lr != 0) { 1922 enerror(le, lockname); 1923 r = -1; 1924 } 1925# endif 1926 } 1927 return r; 1928} 1929 1930 void 1931ORCSclose() 1932{ 1933 if (0 <= fdlock) { 1934 if (close(fdlock) != 0) 1935 efaterror(lockname); 1936 fdlock = -1; 1937 } 1938 Ozclose(&frewrite); 1939} 1940 1941 void 1942ORCSerror() 1943/* 1944* Like ORCSclose, except we are cleaning up after an interrupt or fatal error. 1945* Do not report errors, since this may loop. This is needed only because 1946* some brain-damaged hosts (e.g. OS/2) cannot unlink files that are open, and 1947* some nearly-Posix hosts (e.g. NFS) work better if the files are closed first. 1948* This isn't a completely reliable away to work around brain-damaged hosts, 1949* because of the gap between actual file opening and setting frewrite etc., 1950* but it's better than nothing. 1951*/ 1952{ 1953 if (0 <= fdlock) 1954 VOID close(fdlock); 1955 if (frewrite) 1956 /* Avoid fclose, since stdio may not be reentrant. */ 1957 VOID close(fileno(frewrite)); 1958} 1959