flist.c

   1 /*
   2    Copyright (C) Andrew Tridgell 1996
   3    Copyright (C) Paul Mackerras 1996
   4    Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 /** @file flist.c
  22  * Generate and receive file lists
  23  *
  24  * @todo Get rid of the string_area optimization.  Efficiently
  25  * allocating blocks is the responsibility of the system's malloc
  26  * library, not of rsync.
  27  *
  28  * @sa http://lists.samba.org/pipermail/rsync/2000-June/002351.html
  29  *
  30  **/
  31
  32 #include "rsync.h"
  33
  34 extern struct stats stats;
  35
  36 extern int verbose;
  37 extern int do_progress;
  38 extern int am_server;
  39 extern int always_checksum;
  40
  41 extern int cvs_exclude;
  42
  43 extern int recurse;
  44 extern char *files_from;
  45 extern int filesfrom_fd;
  46
  47 extern int one_file_system;
  48 extern int make_backups;
  49 extern int preserve_links;
  50 extern int preserve_hard_links;
  51 extern int preserve_perms;
  52 extern int preserve_devices;
  53 extern int preserve_uid;
  54 extern int preserve_gid;
  55 extern int preserve_times;
  56 extern int relative_paths;
  57 extern int implied_dirs;
  58 extern int copy_links;
  59 extern int copy_unsafe_links;
  60 extern int protocol_version;
  61 extern int sanitize_paths;
  62
  63 extern int read_batch;
  64 extern int write_batch;
  65
  66 extern struct exclude_struct **exclude_list;
  67 extern struct exclude_struct **server_exclude_list;
  68 extern struct exclude_struct **local_exclude_list;
  69
  70 int io_error;
  71
  72 static struct file_struct null_file;
  73 static char empty_sum[MD4_SUM_LENGTH];
  74
  75 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  76
  77
  78 static int show_filelist_p(void)
  79 {
  80         return verbose && (recurse || files_from) && !am_server;
  81 }
  82
  83 static void start_filelist_progress(char *kind)
  84 {
  85         rprintf(FINFO, "%s ... ", kind);
  86         if ((verbose > 1) || do_progress)
  87                 rprintf(FINFO, "\n");
  88         rflush(FINFO);
  89 }
  90
  91
  92 static void emit_filelist_progress(const struct file_list *flist)
  93 {
  94         rprintf(FINFO, " %d files...\r", flist->count);
  95 }
  96
  97
  98 static void maybe_emit_filelist_progress(const struct file_list *flist)
  99 {
 100         if (do_progress && show_filelist_p() && ((flist->count % 100) == 0))
 101                 emit_filelist_progress(flist);
 102 }
 103
 104
 105 static void finish_filelist_progress(const struct file_list *flist)
 106 {
 107         if (do_progress) {
 108                 /* This overwrites the progress line */
 109                 rprintf(FINFO, "%d file%sto consider\n",
 110                         flist->count, flist->count == 1 ? " " : "s ");
 111         } else
 112                 rprintf(FINFO, "done\n");
 113 }
 114
 115 void show_flist_stats(void)
 116 {
 117         /* Nothing yet */
 118 }
 119
 120
 121 static struct string_area *string_area_new(int size)
 122 {
 123         struct string_area *a;
 124
 125         if (size <= 0)
 126                 size = ARENA_SIZE;
 127         a = new(struct string_area);
 128         if (!a)
 129                 out_of_memory("string_area_new");
 130         a->current = a->base = new_array(char, size);
 131         if (!a->current)
 132                 out_of_memory("string_area_new buffer");
 133         a->end = a->base + size;
 134         a->next = NULL;
 135
 136         return a;
 137 }
 138
 139 static void string_area_free(struct string_area *a)
 140 {
 141         struct string_area *next;
 142
 143         for (; a; a = next) {
 144                 next = a->next;
 145                 free(a->base);
 146         }
 147 }
 148
 149 static char *string_area_malloc(struct string_area **ap, int size)
 150 {
 151         char *p;
 152         struct string_area *a;
 153
 154         /* does the request fit into the current space? */
 155         a = *ap;
 156         if (a->current + size >= a->end) {
 157                 /* no; get space, move new string_area to front of the list */
 158                 a = string_area_new(size > ARENA_SIZE ? size : ARENA_SIZE);
 159                 a->next = *ap;
 160                 *ap = a;
 161         }
 162
 163         /* have space; do the "allocation." */
 164         p = a->current;
 165         a->current += size;
 166         return p;
 167 }
 168
 169 static char *string_area_strdup(struct string_area **ap, const char *src)
 170 {
 171         char *dest = string_area_malloc(ap, strlen(src) + 1);
 172         return strcpy(dest, src);
 173 }
 174
 175 static void list_file_entry(struct file_struct *f)
 176 {
 177         char perms[11];
 178
 179         if (!f->basename)
 180                 /* this can happen if duplicate names were removed */
 181                 return;
 182
 183         permstring(perms, f->mode);
 184
 185         if (preserve_links && S_ISLNK(f->mode)) {
 186                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 187                         perms,
 188                         (double) f->length, timestring(f->modtime),
 189                         f_name(f), f->link);
 190         } else {
 191                 rprintf(FINFO, "%s %11.0f %s %s\n",
 192                         perms,
 193                         (double) f->length, timestring(f->modtime),
 194                         f_name(f));
 195         }
 196 }
 197
 198
 199 /**
 200  * Stat either a symlink or its referent, depending on the settings of
 201  * copy_links, copy_unsafe_links, etc.
 202  *
 203  * @retval -1 on error
 204  *
 205  * @retval 0 for success
 206  *
 207  * @post If @p path is a symlink, then @p linkbuf (of size @c
 208  * MAXPATHLEN) contains the symlink target.
 209  *
 210  * @post @p buffer contains information about the link or the
 211  * referrent as appropriate, if they exist.
 212  **/
 213 int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 214 {
 215 #if SUPPORT_LINKS
 216         if (copy_links)
 217                 return do_stat(path, buffer);
 218         if (do_lstat(path, buffer) == -1)
 219                 return -1;
 220         if (S_ISLNK(buffer->st_mode)) {
 221                 int l = readlink((char *) path, linkbuf, MAXPATHLEN - 1);
 222                 if (l == -1)
 223                         return -1;
 224                 linkbuf[l] = 0;
 225                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 226                         if (verbose > 1) {
 227                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 228                                         path, linkbuf);
 229                         }
 230                         return do_stat(path, buffer);
 231                 }
 232         }
 233         return 0;
 234 #else
 235         return do_stat(path, buffer);
 236 #endif
 237 }
 238
 239 int link_stat(const char *path, STRUCT_STAT * buffer)
 240 {
 241 #if SUPPORT_LINKS
 242         if (copy_links)
 243                 return do_stat(path, buffer);
 244         return do_lstat(path, buffer);
 245 #else
 246         return do_stat(path, buffer);
 247 #endif
 248 }
 249
 250 /*
 251  * This function is used to check if a file should be included/excluded
 252  * from the list of files based on its name and type etc.  The value of
 253  * exclude_level is set to either SERVER_EXCLUDES or ALL_EXCLUDES.
 254  */
 255 static int check_exclude_file(char *fname, int is_dir, int exclude_level)
 256 {
 257 #if 0 /* This currently never happens, so avoid a useless compare. */
 258         if (exclude_level == NO_EXCLUDES)
 259                 return 0;
 260 #endif
 261         if (fname) {
 262                 /* never exclude '.', even if somebody does --exclude '*' */
 263                 if (fname[0] == '.' && !fname[1])
 264                         return 0;
 265                 /* Handle the -R version of the '.' dir. */
 266                 if (fname[0] == '/') {
 267                         int len = strlen(fname);
 268                         if (fname[len-1] == '.' && fname[len-2] == '/')
 269                                 return 0;
 270                 }
 271         }
 272         if (server_exclude_list
 273          && check_exclude(server_exclude_list, fname, is_dir))
 274                 return 1;
 275         if (exclude_level != ALL_EXCLUDES)
 276                 return 0;
 277         if (exclude_list && check_exclude(exclude_list, fname, is_dir))
 278                 return 1;
 279         if (local_exclude_list
 280          && check_exclude(local_exclude_list, fname, is_dir))
 281                 return 1;
 282         return 0;
 283 }
 284
 285 /* used by the one_file_system code */
 286 static dev_t filesystem_dev;
 287
 288 static void set_filesystem(char *fname)
 289 {
 290         STRUCT_STAT st;
 291         if (link_stat(fname, &st) != 0)
 292                 return;
 293         filesystem_dev = st.st_dev;
 294 }
 295
 296
 297 static int to_wire_mode(mode_t mode)
 298 {
 299         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 300                 return (mode & ~(_S_IFMT)) | 0120000;
 301         return (int) mode;
 302 }
 303
 304 static mode_t from_wire_mode(int mode)
 305 {
 306         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 307                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 308         return (mode_t) mode;
 309 }
 310
 311
 312 static void send_directory(int f, struct file_list *flist, char *dir);
 313
 314 static char *flist_dir;
 315
 316
 317 /**
 318  * Make sure @p flist is big enough to hold at least @p flist->count
 319  * entries.
 320  **/
 321 static void flist_expand(struct file_list *flist)
 322 {
 323         if (flist->count >= flist->malloced) {
 324                 void *new_ptr;
 325
 326                 if (flist->malloced < 1000)
 327                         flist->malloced += 1000;
 328                 else
 329                         flist->malloced *= 2;
 330
 331                 if (flist->files) {
 332                         new_ptr = realloc_array(flist->files,
 333                                                 struct file_struct *,
 334                                                 flist->malloced);
 335                 } else {
 336                         new_ptr = new_array(struct file_struct *,
 337                                             flist->malloced);
 338                 }
 339
 340                 if (verbose >= 2) {
 341                         rprintf(FINFO, "expand file_list to %.0f bytes, did%s move\n",
 342                                 (double)sizeof(flist->files[0])
 343                                 * flist->malloced,
 344                                 (new_ptr == flist->files) ? " not" : "");
 345                 }
 346
 347                 flist->files = (struct file_struct **) new_ptr;
 348
 349                 if (!flist->files)
 350                         out_of_memory("flist_expand");
 351         }
 352 }
 353
 354 /* These vars are used by both send_file_entry() and receive_file_entry()
 355  * (but just one at a time).  They have been placed outside these functions
 356  * so that we can reset the values when the batch-processing wants to make
 357  * extra use of these functions (which needs to start from a known state). */
 358 static time_t modtime;
 359 static mode_t mode;
 360 static DEV64_T rdev;    /* just high bytes in p28 onward */
 361 static uid_t uid;
 362 static gid_t gid;
 363 static DEV64_T dev;
 364 static char lastname[MAXPATHLEN];
 365
 366 void reset_file_entry_vars(void)
 367 {
 368         modtime = 0;
 369         mode = 0;
 370         rdev = 0;
 371         uid = 0;
 372         gid = 0;
 373         dev = 0;
 374         *lastname = '\0';
 375 }
 376
 377 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 378 {
 379         unsigned short flags;
 380         char *fname, fbuf[MAXPATHLEN];
 381         int l1, l2;
 382
 383         if (f == -1)
 384                 return;
 385
 386         if (!file) {
 387                 write_byte(f, 0);
 388                 return;
 389         }
 390
 391         io_write_phase = "send_file_entry";
 392
 393         fname = f_name_to(file, fbuf, sizeof fbuf);
 394
 395         flags = base_flags;
 396
 397         if (file->mode == mode)
 398                 flags |= SAME_MODE;
 399         else
 400                 mode = file->mode;
 401         if (preserve_devices) {
 402                 if (protocol_version < 28) {
 403                         if (IS_DEVICE(mode) && file->rdev == rdev) {
 404                                 /* Set both flags so that the test when
 405                                  * writing the data is simpler. */
 406                                 flags |= SAME_RDEV_pre28|SAME_HIGH_RDEV;
 407                         }
 408                         else
 409                                 rdev = file->rdev;
 410                 }
 411                 else if (IS_DEVICE(mode)) {
 412                         if ((file->rdev & ~0xFF) == rdev)
 413                                 flags |= SAME_HIGH_RDEV;
 414                         else
 415                                 rdev = file->rdev & ~0xFF;
 416                 }
 417         }
 418         if (file->uid == uid)
 419                 flags |= SAME_UID;
 420         else
 421                 uid = file->uid;
 422         if (file->gid == gid)
 423                 flags |= SAME_GID;
 424         else
 425                 gid = file->gid;
 426         if (file->modtime == modtime)
 427                 flags |= SAME_TIME;
 428         else
 429                 modtime = file->modtime;
 430         if (file->flags & HAS_INODE_DATA) {
 431                 if (file->dev == dev) {
 432                         if (protocol_version >= 28)
 433                                 flags |= SAME_DEV;
 434                 }
 435                 else
 436                         dev = file->dev;
 437                 flags |= HAS_INODE_DATA;
 438         }
 439
 440         for (l1 = 0;
 441              lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 442              l1++) {}
 443         l2 = strlen(fname) - l1;
 444
 445         if (l1 > 0)
 446                 flags |= SAME_NAME;
 447         if (l2 > 255)
 448                 flags |= LONG_NAME;
 449
 450         /* We must make sure we don't send a zero flags byte or
 451          * the other end will terminate the flist transfer. */
 452         if (flags == 0 && !S_ISDIR(mode))
 453                 flags |= FLAG_DELETE; /* NOTE: no meaning for non-dir */
 454         if (protocol_version >= 28) {
 455                 if ((flags & 0xFF00) || flags == 0) {
 456                         flags |= EXTENDED_FLAGS;
 457                         write_byte(f, flags);
 458                         write_byte(f, flags >> 8);
 459                 } else
 460                         write_byte(f, flags);
 461         } else {
 462                 if (flags == 0)
 463                         flags |= LONG_NAME;
 464                 write_byte(f, flags);
 465         }
 466         if (flags & SAME_NAME)
 467                 write_byte(f, l1);
 468         if (flags & LONG_NAME)
 469                 write_int(f, l2);
 470         else
 471                 write_byte(f, l2);
 472         write_buf(f, fname + l1, l2);
 473
 474         write_longint(f, file->length);
 475         if (!(flags & SAME_TIME))
 476                 write_int(f, modtime);
 477         if (!(flags & SAME_MODE))
 478                 write_int(f, to_wire_mode(mode));
 479         if (preserve_uid && !(flags & SAME_UID)) {
 480                 add_uid(uid);
 481                 write_int(f, uid);
 482         }
 483         if (preserve_gid && !(flags & SAME_GID)) {
 484                 add_gid(gid);
 485                 write_int(f, gid);
 486         }
 487         if (preserve_devices && IS_DEVICE(mode)) {
 488                 /* If SAME_HIGH_RDEV is off, SAME_RDEV_pre28 is also off.
 489                  * Also, avoid using "rdev" because it may be incomplete. */
 490                 if (!(flags & SAME_HIGH_RDEV))
 491                         write_int(f, file->rdev);
 492                 else if (protocol_version >= 28)
 493                         write_byte(f, file->rdev);
 494         }
 495
 496 #if SUPPORT_LINKS
 497         if (preserve_links && S_ISLNK(mode)) {
 498                 write_int(f, strlen(file->link));
 499                 write_buf(f, file->link, strlen(file->link));
 500         }
 501 #endif
 502
 503 #if SUPPORT_HARD_LINKS
 504         if (flags & HAS_INODE_DATA) {
 505                 if (protocol_version < 26) {
 506                         /* 32-bit dev_t and ino_t */
 507                         write_int(f, dev);
 508                         write_int(f, file->inode);
 509                 } else {
 510                         /* 64-bit dev_t and ino_t */
 511                         if (!(flags & SAME_DEV))
 512                                 write_longint(f, dev);
 513                         write_longint(f, file->inode);
 514                 }
 515         }
 516 #endif
 517
 518         if (always_checksum && (protocol_version < 28 || S_ISREG(mode))) {
 519                 char *sum = file->sum? file->sum : empty_sum;
 520                 write_buf(f, sum, protocol_version < 21? 2
 521                                                 : MD4_SUM_LENGTH);
 522         }
 523
 524         strlcpy(lastname, fname, MAXPATHLEN);
 525         lastname[MAXPATHLEN - 1] = 0;
 526
 527         io_write_phase = "unknown";
 528 }
 529
 530
 531
 532 void receive_file_entry(struct file_struct **fptr, unsigned short flags, int f)
 533 {
 534         char thisname[MAXPATHLEN];
 535         unsigned int l1 = 0, l2 = 0;
 536         char *p;
 537         struct file_struct *file;
 538
 539         if (flags & SAME_NAME)
 540                 l1 = read_byte(f);
 541
 542         if (flags & LONG_NAME)
 543                 l2 = read_int(f);
 544         else
 545                 l2 = read_byte(f);
 546
 547         file = new(struct file_struct);
 548         if (!file)
 549                 out_of_memory("receive_file_entry");
 550         memset((char *) file, 0, sizeof(*file));
 551         (*fptr) = file;
 552
 553         if (l2 >= MAXPATHLEN - l1) {
 554                 rprintf(FERROR,
 555                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 556                         flags, l1, l2, lastname);
 557                 overflow("receive_file_entry");
 558         }
 559
 560         strlcpy(thisname, lastname, l1 + 1);
 561         read_sbuf(f, &thisname[l1], l2);
 562         thisname[l1 + l2] = 0;
 563
 564         strlcpy(lastname, thisname, MAXPATHLEN);
 565         lastname[MAXPATHLEN - 1] = 0;
 566
 567         clean_fname(thisname);
 568
 569         if (sanitize_paths) {
 570                 sanitize_path(thisname, NULL);
 571         }
 572
 573         if ((p = strrchr(thisname, '/'))) {
 574                 static char *lastdir;
 575                 *p = 0;
 576                 if (lastdir && strcmp(thisname, lastdir) == 0)
 577                         file->dirname = lastdir;
 578                 else {
 579                         file->dirname = strdup(thisname);
 580                         lastdir = file->dirname;
 581                 }
 582                 file->basename = strdup(p + 1);
 583         } else {
 584                 file->dirname = NULL;
 585                 file->basename = strdup(thisname);
 586         }
 587
 588         if (!file->basename)
 589                 out_of_memory("receive_file_entry 1");
 590
 591         file->flags = flags;
 592         file->length = read_longint(f);
 593         if (!(flags & SAME_TIME))
 594                 modtime = (time_t)read_int(f);
 595         file->modtime = modtime;
 596         if (!(flags & SAME_MODE))
 597                 mode = from_wire_mode(read_int(f));
 598         file->mode = mode;
 599
 600         if (preserve_uid) {
 601                 if (!(flags & SAME_UID))
 602                         uid = (uid_t)read_int(f);
 603                 file->uid = uid;
 604         }
 605         if (preserve_gid) {
 606                 if (!(flags & SAME_GID))
 607                         gid = (gid_t)read_int(f);
 608                 file->gid = gid;
 609         }
 610         if (preserve_devices) {
 611                 if (protocol_version < 28) {
 612                         if (IS_DEVICE(mode)) {
 613                                 if (!(flags & SAME_RDEV_pre28))
 614                                         rdev = (DEV64_T)read_int(f);
 615                                 file->rdev = rdev;
 616                         } else
 617                                 rdev = 0;
 618                 } else if (IS_DEVICE(mode)) {
 619                         if (!(flags & SAME_HIGH_RDEV)) {
 620                                 file->rdev = (DEV64_T)read_int(f);
 621                                 rdev = file->rdev & ~0xFF;
 622                         } else
 623                                 file->rdev = rdev | (DEV64_T)read_byte(f);
 624                 }
 625         }
 626
 627         if (preserve_links && S_ISLNK(mode)) {
 628                 int l = read_int(f);
 629                 if (l < 0) {
 630                         rprintf(FERROR, "overflow: l=%d\n", l);
 631                         overflow("receive_file_entry");
 632                 }
 633                 file->link = new_array(char, l + 1);
 634                 if (!file->link)
 635                         out_of_memory("receive_file_entry 2");
 636                 read_sbuf(f, file->link, l);
 637                 if (sanitize_paths)
 638                         sanitize_path(file->link, file->dirname);
 639         }
 640 #if SUPPORT_HARD_LINKS
 641         if (preserve_hard_links && protocol_version < 28
 642             && S_ISREG(mode))
 643                 file->flags |= HAS_INODE_DATA;
 644         if (file->flags & HAS_INODE_DATA) {
 645                 if (protocol_version < 26) {
 646                         dev = read_int(f);
 647                         file->inode = read_int(f);
 648                 } else {
 649                         if (!(flags & SAME_DEV))
 650                                 dev = read_longint(f);
 651                         file->inode = read_longint(f);
 652                 }
 653                 file->dev = dev;
 654         }
 655 #endif
 656
 657         if (always_checksum) {
 658                 char *sum;
 659                 if (S_ISREG(mode)) {
 660                         sum = file->sum = new_array(char, MD4_SUM_LENGTH);
 661                         if (!sum)
 662                                 out_of_memory("md4 sum");
 663                 } else if (protocol_version < 28) {
 664                         /* Prior to 28, we get a useless set of nulls. */
 665                         sum = empty_sum;
 666                 } else
 667                         sum = NULL;
 668                 if (sum) {
 669                         read_buf(f, sum, protocol_version < 21? 2
 670                                                 : MD4_SUM_LENGTH);
 671                 }
 672         }
 673
 674         if (!preserve_perms) {
 675                 extern int orig_umask;
 676                 /* set an appropriate set of permissions based on original
 677                  * permissions and umask. This emulates what GNU cp does */
 678                 file->mode &= ~orig_umask;
 679         }
 680 }
 681
 682
 683 /* determine if a file in a different filesstem should be skipped
 684    when one_file_system is set. We bascally only want to include
 685    the mount points - but they can be hard to find! */
 686 static int skip_filesystem(char *fname, STRUCT_STAT * st)
 687 {
 688         STRUCT_STAT st2;
 689         char *p = strrchr(fname, '/');
 690
 691         /* skip all but directories */
 692         if (!S_ISDIR(st->st_mode))
 693                 return 1;
 694
 695         /* if its not a subdirectory then allow */
 696         if (!p)
 697                 return 0;
 698
 699         *p = 0;
 700         if (link_stat(fname, &st2)) {
 701                 *p = '/';
 702                 return 0;
 703         }
 704         *p = '/';
 705
 706         return (st2.st_dev != filesystem_dev);
 707 }
 708
 709 #define STRDUP(ap, p)   (ap ? string_area_strdup(ap, p) : strdup(p))
 710 /* IRIX cc cares that the operands to the ternary have the same type. */
 711 #define MALLOC(ap, i)   (ap ? (void*) string_area_malloc(ap, i) : malloc(i))
 712
 713 /**
 714  * Create a file_struct for a named file by reading its stat()
 715  * information and performing extensive checks against global
 716  * options.
 717  *
 718  * @return the new file, or NULL if there was an error or this file
 719  * should be excluded.
 720  *
 721  * @todo There is a small optimization opportunity here to avoid
 722  * stat()ing the file in some circumstances, which has a certain cost.
 723  * We are called immediately after doing readdir(), and so we may
 724  * already know the d_type of the file.  We could for example avoid
 725  * statting directories if we're not recursing, but this is not a very
 726  * important case.  Some systems may not have d_type.
 727  **/
 728 struct file_struct *make_file(char *fname, struct string_area **ap,
 729                               int exclude_level)
 730 {
 731         struct file_struct *file;
 732         STRUCT_STAT st;
 733         char sum[SUM_LENGTH];
 734         char *p;
 735         char cleaned_name[MAXPATHLEN];
 736         char linkbuf[MAXPATHLEN];
 737         extern int module_id;
 738
 739         strlcpy(cleaned_name, fname, MAXPATHLEN);
 740         cleaned_name[MAXPATHLEN - 1] = 0;
 741         clean_fname(cleaned_name);
 742         if (sanitize_paths)
 743                 sanitize_path(cleaned_name, NULL);
 744         fname = cleaned_name;
 745
 746         memset(sum, 0, SUM_LENGTH);
 747
 748         if (readlink_stat(fname, &st, linkbuf) != 0) {
 749                 int save_errno = errno;
 750                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
 751                         /* either symlink pointing nowhere or file that
 752                          * was removed during rsync run; see if excluded
 753                          * before reporting an error */
 754                         if (check_exclude_file(fname, 0, exclude_level)) {
 755                                 /* file is excluded anyway, ignore silently */
 756                                 return NULL;
 757                         }
 758                 }
 759                 io_error |= IOERR_GENERAL;
 760                 rprintf(FERROR, "readlink %s failed: %s\n",
 761                         full_fname(fname), strerror(save_errno));
 762                 return NULL;
 763         }
 764
 765         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 766         if (exclude_level == NO_EXCLUDES)
 767                 goto skip_excludes;
 768
 769         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 770                 rprintf(FINFO, "skipping directory %s\n", fname);
 771                 return NULL;
 772         }
 773
 774         if (one_file_system && st.st_dev != filesystem_dev) {
 775                 if (skip_filesystem(fname, &st))
 776                         return NULL;
 777         }
 778
 779         if (check_exclude_file(fname, S_ISDIR(st.st_mode) != 0, exclude_level))
 780                 return NULL;
 781
 782         if (lp_ignore_nonreadable(module_id) && access(fname, R_OK) != 0)
 783                 return NULL;
 784
 785       skip_excludes:
 786
 787         if (verbose > 2)
 788                 rprintf(FINFO, "make_file(%s,*,%d)\n", fname, exclude_level);
 789
 790         file = new(struct file_struct);
 791         if (!file)
 792                 out_of_memory("make_file");
 793         memset((char *) file, 0, sizeof(*file));
 794
 795         if ((p = strrchr(fname, '/'))) {
 796                 static char *lastdir;
 797                 *p = 0;
 798                 if (lastdir && strcmp(fname, lastdir) == 0)
 799                         file->dirname = lastdir;
 800                 else {
 801                         file->dirname = strdup(fname);
 802                         lastdir = file->dirname;
 803                 }
 804                 file->basename = STRDUP(ap, p + 1);
 805                 *p = '/';
 806         } else {
 807                 file->dirname = NULL;
 808                 file->basename = STRDUP(ap, fname);
 809         }
 810
 811         file->modtime = st.st_mtime;
 812         file->length = st.st_size;
 813         file->mode = st.st_mode;
 814         file->uid = st.st_uid;
 815         file->gid = st.st_gid;
 816         if (preserve_hard_links) {
 817                 if (protocol_version < 28? S_ISREG(st.st_mode)
 818                     : !S_ISDIR(st.st_mode) && st.st_nlink > 1) {
 819                         file->dev = st.st_dev;
 820                         file->inode = st.st_ino;
 821                         file->flags |= HAS_INODE_DATA;
 822                 }
 823         }
 824 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 825         file->rdev = st.st_rdev;
 826 #endif
 827
 828 #if SUPPORT_LINKS
 829         if (S_ISLNK(st.st_mode))
 830                 file->link = STRDUP(ap, linkbuf);
 831 #endif
 832
 833         if (always_checksum && S_ISREG(st.st_mode)) {
 834                 file->sum = (char*)MALLOC(ap, MD4_SUM_LENGTH);
 835                 if (!file->sum)
 836                         out_of_memory("md4 sum");
 837                 file_checksum(fname, file->sum, st.st_size);
 838         }
 839
 840         if (flist_dir) {
 841                 static char *lastdir;
 842                 if (lastdir && strcmp(lastdir, flist_dir) == 0)
 843                         file->basedir = lastdir;
 844                 else {
 845                         file->basedir = strdup(flist_dir);
 846                         lastdir = file->basedir;
 847                 }
 848         } else
 849                 file->basedir = NULL;
 850
 851         if (!S_ISDIR(st.st_mode))
 852                 stats.total_size += st.st_size;
 853
 854         return file;
 855 }
 856
 857
 858 void send_file_name(int f, struct file_list *flist, char *fname,
 859                     int recursive, unsigned short base_flags)
 860 {
 861         struct file_struct *file;
 862         char fbuf[MAXPATHLEN];
 863         extern int delete_excluded;
 864
 865         /* f is set to -1 when calculating deletion file list */
 866         file = make_file(fname, &flist->string_area,
 867                          f == -1 && delete_excluded? SERVER_EXCLUDES
 868                                                    : ALL_EXCLUDES);
 869
 870         if (!file)
 871                 return;
 872
 873         maybe_emit_filelist_progress(flist);
 874
 875         flist_expand(flist);
 876
 877         if (write_batch)
 878                 file->flags |= FLAG_DELETE;
 879
 880         if (file->basename[0]) {
 881                 flist->files[flist->count++] = file;
 882                 send_file_entry(file, f, base_flags);
 883         }
 884
 885         if (S_ISDIR(file->mode) && recursive) {
 886                 struct exclude_struct **last_exclude_list =
 887                     local_exclude_list;
 888                 send_directory(f, flist, f_name_to(file, fbuf, sizeof fbuf));
 889                 local_exclude_list = last_exclude_list;
 890                 return;
 891         }
 892 }
 893
 894
 895 static void send_directory(int f, struct file_list *flist, char *dir)
 896 {
 897         DIR *d;
 898         struct dirent *di;
 899         char fname[MAXPATHLEN];
 900         int l;
 901         char *p;
 902
 903         d = opendir(dir);
 904         if (!d) {
 905                 io_error |= IOERR_GENERAL;
 906                 rprintf(FERROR, "opendir %s failed: %s\n",
 907                         full_fname(dir), strerror(errno));
 908                 return;
 909         }
 910
 911         strlcpy(fname, dir, MAXPATHLEN);
 912         l = strlen(fname);
 913         if (fname[l - 1] != '/') {
 914                 if (l == MAXPATHLEN - 1) {
 915                         io_error |= IOERR_GENERAL;
 916                         rprintf(FERROR, "skipping long-named directory: %s\n",
 917                                 full_fname(fname));
 918                         closedir(d);
 919                         return;
 920                 }
 921                 strlcat(fname, "/", MAXPATHLEN);
 922                 l++;
 923         }
 924         p = fname + strlen(fname);
 925
 926         local_exclude_list = NULL;
 927
 928         if (cvs_exclude) {
 929                 if (strlen(fname) + strlen(".cvsignore") <= MAXPATHLEN - 1) {
 930                         strcpy(p, ".cvsignore");
 931                         add_exclude_file(&exclude_list,fname,MISSING_OK,ADD_EXCLUDE);
 932                 } else {
 933                         io_error |= IOERR_GENERAL;
 934                         rprintf(FINFO,
 935                                 "cannot cvs-exclude in long-named directory %s\n",
 936                                 full_fname(fname));
 937                 }
 938         }
 939
 940         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 941                 char *dname = d_name(di);
 942                 if (dname[0] == '.' && (dname[1] == '\0'
 943                     || (dname[1] == '.' && dname[2] == '\0')))
 944                         continue;
 945                 strlcpy(p, dname, MAXPATHLEN - l);
 946                 send_file_name(f, flist, fname, recurse, 0);
 947         }
 948         if (errno) {
 949                 io_error |= IOERR_GENERAL;
 950                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
 951                     dir, errno, strerror(errno));
 952         }
 953
 954         if (local_exclude_list)
 955                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
 956
 957         closedir(d);
 958 }
 959
 960
 961 /**
 962  * The delete_files() function in receiver.c sets f to -1 so that we just
 963  * construct the file list in memory without sending it over the wire.  It
 964  * also has the side-effect of ignoring user-excludes if delete_excluded
 965  * is set (so that the delete list includes user-excluded files).
 966  **/
 967 struct file_list *send_file_list(int f, int argc, char *argv[])
 968 {
 969         int l;
 970         STRUCT_STAT st;
 971         char *p, *dir, *olddir;
 972         char lastpath[MAXPATHLEN] = "";
 973         struct file_list *flist;
 974         int64 start_write;
 975         int use_ff_fd = 0;
 976
 977         if (show_filelist_p() && f != -1)
 978                 start_filelist_progress("building file list");
 979
 980         start_write = stats.total_written;
 981
 982         flist = flist_new();
 983
 984         if (f != -1) {
 985                 io_start_buffering_out(f);
 986                 if (filesfrom_fd >= 0) {
 987                         if (argv[0] && !push_dir(argv[0], 0)) {
 988                                 rprintf(FERROR, "push_dir %s failed: %s\n",
 989                                         full_fname(argv[0]), strerror(errno));
 990                                 exit_cleanup(RERR_FILESELECT);
 991                         }
 992                         use_ff_fd = 1;
 993                 }
 994         }
 995
 996         while (1) {
 997                 char fname2[MAXPATHLEN];
 998                 char *fname = fname2;
 999
1000                 if (use_ff_fd) {
1001                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1002                                 break;
1003                         sanitize_path(fname, NULL);
1004                 } else {
1005                         if (argc-- == 0)
1006                                 break;
1007                         strlcpy(fname, *argv++, MAXPATHLEN);
1008                         if (sanitize_paths)
1009                                 sanitize_path(fname, NULL);
1010                 }
1011
1012                 l = strlen(fname);
1013                 if (fname[l - 1] == '/') {
1014                         if (l == 2 && fname[0] == '.') {
1015                                 /* Turn "./" into just "." rather than "./." */
1016                                 fname[1] = '\0';
1017                         } else {
1018                                 strlcat(fname, ".", MAXPATHLEN);
1019                         }
1020                 }
1021
1022                 if (link_stat(fname, &st) != 0) {
1023                         if (f != -1) {
1024                                 io_error |= IOERR_GENERAL;
1025                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1026                                         full_fname(fname), strerror(errno));
1027                         }
1028                         continue;
1029                 }
1030
1031                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1032                         rprintf(FINFO, "skipping directory %s\n", fname);
1033                         continue;
1034                 }
1035
1036                 dir = NULL;
1037                 olddir = NULL;
1038
1039                 if (!relative_paths) {
1040                         p = strrchr(fname, '/');
1041                         if (p) {
1042                                 *p = 0;
1043                                 if (p == fname)
1044                                         dir = "/";
1045                                 else
1046                                         dir = fname;
1047                                 fname = p + 1;
1048                         }
1049                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1050                         /* this ensures we send the intermediate directories,
1051                            thus getting their permissions right */
1052                         char *lp = lastpath, *fn = fname, *slash = fname;
1053                         *p = 0;
1054                         /* Skip any initial directories in our path that we
1055                          * have in common with lastpath. */
1056                         while (*fn && *lp == *fn) {
1057                                 if (*fn == '/')
1058                                         slash = fn;
1059                                 lp++, fn++;
1060                         }
1061                         *p = '/';
1062                         if (fn != p || (*lp && *lp != '/')) {
1063                                 int copy_links_saved = copy_links;
1064                                 int recurse_saved = recurse;
1065                                 copy_links = copy_unsafe_links;
1066                                 /* set recurse to 1 to prevent make_file
1067                                  * from ignoring directory, but still
1068                                  * turn off the recursive parameter to
1069                                  * send_file_name */
1070                                 recurse = 1;
1071                                 while ((slash = strchr(slash+1, '/')) != 0) {
1072                                         *slash = 0;
1073                                         send_file_name(f, flist, fname, 0, 0);
1074                                         *slash = '/';
1075                                 }
1076                                 copy_links = copy_links_saved;
1077                                 recurse = recurse_saved;
1078                                 *p = 0;
1079                                 strlcpy(lastpath, fname, sizeof lastpath);
1080                                 *p = '/';
1081                         }
1082                 }
1083
1084                 if (!*fname)
1085                         fname = ".";
1086
1087                 if (dir && *dir) {
1088                         olddir = push_dir(dir, 1);
1089
1090                         if (!olddir) {
1091                                 io_error |= IOERR_GENERAL;
1092                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1093                                         full_fname(dir), strerror(errno));
1094                                 continue;
1095                         }
1096
1097                         flist_dir = dir;
1098                 }
1099
1100                 if (one_file_system)
1101                         set_filesystem(fname);
1102
1103                 send_file_name(f, flist, fname, recurse, FLAG_DELETE);
1104
1105                 if (olddir != NULL) {
1106                         flist_dir = NULL;
1107                         if (pop_dir(olddir) != 0) {
1108                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1109                                         full_fname(dir), strerror(errno));
1110                                 exit_cleanup(RERR_FILESELECT);
1111                         }
1112                 }
1113         }
1114
1115         if (f != -1)
1116                 send_file_entry(NULL, f, 0);
1117
1118         if (show_filelist_p() && f != -1)
1119                 finish_filelist_progress(flist);
1120
1121         clean_flist(flist, 0, 0);
1122
1123         /* now send the uid/gid list. This was introduced in protocol
1124            version 15 */
1125         if (f != -1)
1126                 send_uid_list(f);
1127
1128         /* send the io_error flag */
1129         if (f != -1) {
1130                 extern int module_id;
1131                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1132         }
1133
1134         if (f != -1) {
1135                 io_end_buffering();
1136                 stats.flist_size = stats.total_written - start_write;
1137                 stats.num_files = flist->count;
1138                 if (write_batch)
1139                         write_batch_flist_info(flist->count, flist->files);
1140         }
1141
1142         if (verbose > 2)
1143                 rprintf(FINFO, "send_file_list done\n");
1144
1145         return flist;
1146 }
1147
1148
1149 struct file_list *recv_file_list(int f)
1150 {
1151         struct file_list *flist;
1152         unsigned short flags;
1153         int64 start_read;
1154         extern int list_only;
1155
1156         if (show_filelist_p())
1157                 start_filelist_progress("receiving file list");
1158
1159         start_read = stats.total_read;
1160
1161         flist = new(struct file_list);
1162         if (!flist)
1163                 goto oom;
1164
1165         flist->count = 0;
1166         flist->malloced = 1000;
1167         flist->files = new_array(struct file_struct *, flist->malloced);
1168         if (!flist->files)
1169                 goto oom;
1170
1171
1172         while ((flags = read_byte(f)) != 0) {
1173                 int i = flist->count;
1174
1175                 flist_expand(flist);
1176
1177                 if (protocol_version >= 28 && (flags & EXTENDED_FLAGS))
1178                         flags |= read_byte(f) << 8;
1179                 receive_file_entry(&flist->files[i], flags, f);
1180
1181                 if (S_ISREG(flist->files[i]->mode))
1182                         stats.total_size += flist->files[i]->length;
1183
1184                 flist->count++;
1185
1186                 maybe_emit_filelist_progress(flist);
1187
1188                 if (verbose > 2) {
1189                         rprintf(FINFO, "recv_file_name(%s)\n",
1190                                 f_name(flist->files[i]));
1191                 }
1192         }
1193
1194
1195         if (verbose > 2)
1196                 rprintf(FINFO, "received %d names\n", flist->count);
1197
1198         clean_flist(flist, relative_paths, 1);
1199
1200         if (show_filelist_p())
1201                 finish_filelist_progress(flist);
1202
1203         /* now recv the uid/gid list. This was introduced in protocol version 15 */
1204         if (f != -1)
1205                 recv_uid_list(f, flist);
1206
1207         /* recv the io_error flag */
1208         if (f != -1 && !read_batch) {   /* dw-added readbatch */
1209                 extern int module_id;
1210                 extern int ignore_errors;
1211                 if (lp_ignore_errors(module_id) || ignore_errors)
1212                         read_int(f);
1213                 else
1214                         io_error |= read_int(f);
1215         }
1216
1217         if (list_only) {
1218                 int i;
1219                 for (i = 0; i < flist->count; i++)
1220                         list_file_entry(flist->files[i]);
1221         }
1222
1223
1224         if (verbose > 2)
1225                 rprintf(FINFO, "recv_file_list done\n");
1226
1227         stats.flist_size = stats.total_read - start_read;
1228         stats.num_files = flist->count;
1229
1230         return flist;
1231
1232       oom:
1233         out_of_memory("recv_file_list");
1234         return NULL;            /* not reached */
1235 }
1236
1237
1238 int file_compare(struct file_struct **file1, struct file_struct **file2)
1239 {
1240         struct file_struct *f1 = *file1;
1241         struct file_struct *f2 = *file2;
1242
1243         if (!f1->basename && !f2->basename)
1244                 return 0;
1245         if (!f1->basename)
1246                 return -1;
1247         if (!f2->basename)
1248                 return 1;
1249         if (f1->dirname == f2->dirname)
1250                 return u_strcmp(f1->basename, f2->basename);
1251         return f_name_cmp(f1, f2);
1252 }
1253
1254
1255 int flist_find(struct file_list *flist, struct file_struct *f)
1256 {
1257         int low = 0, high = flist->count - 1;
1258
1259         while (high >= 0 && !flist->files[high]->basename) high--;
1260
1261         if (high < 0)
1262                 return -1;
1263
1264         while (low != high) {
1265                 int mid = (low + high) / 2;
1266                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1267                 if (ret == 0)
1268                         return flist_up(flist, mid);
1269                 if (ret > 0)
1270                         high = mid;
1271                 else
1272                         low = mid + 1;
1273         }
1274
1275         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1276                 return flist_up(flist, low);
1277         return -1;
1278 }
1279
1280
1281 /*
1282  * free up one file
1283  */
1284 void free_file(struct file_struct *file)
1285 {
1286         if (!file)
1287                 return;
1288         if (file->basename)
1289                 free(file->basename);
1290         if (file->link)
1291                 free(file->link);
1292         if (file->sum)
1293                 free(file->sum);
1294         *file = null_file;
1295 }
1296
1297
1298 /*
1299  * allocate a new file list
1300  */
1301 struct file_list *flist_new(void)
1302 {
1303         struct file_list *flist;
1304
1305         flist = new(struct file_list);
1306         if (!flist)
1307                 out_of_memory("send_file_list");
1308
1309         flist->count = 0;
1310         flist->malloced = 0;
1311         flist->files = NULL;
1312
1313 #if ARENA_SIZE > 0
1314         flist->string_area = string_area_new(0);
1315 #else
1316         flist->string_area = NULL;
1317 #endif
1318         return flist;
1319 }
1320
1321 /*
1322  * free up all elements in a flist
1323  */
1324 void flist_free(struct file_list *flist)
1325 {
1326         int i;
1327         for (i = 1; i < flist->count; i++) {
1328                 if (!flist->string_area)
1329                         free_file(flist->files[i]);
1330                 free(flist->files[i]);
1331         }
1332         /* FIXME: I don't think we generally need to blank the flist
1333          * since it's about to be freed.  This will just cause more
1334          * memory traffic.  If you want a freed-memory debugger, you
1335          * know where to get it. */
1336         memset((char *) flist->files, 0,
1337                sizeof(flist->files[0]) * flist->count);
1338         free(flist->files);
1339         if (flist->string_area)
1340                 string_area_free(flist->string_area);
1341         memset((char *) flist, 0, sizeof(*flist));
1342         free(flist);
1343 }
1344
1345
1346 /*
1347  * This routine ensures we don't have any duplicate names in our file list.
1348  * duplicate names can cause corruption because of the pipelining
1349  */
1350 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1351 {
1352         int i, prev_i = 0;
1353
1354         if (!flist || flist->count == 0)
1355                 return;
1356
1357         qsort(flist->files, flist->count,
1358               sizeof(flist->files[0]), (int (*)()) file_compare);
1359
1360         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1361                 if (flist->files[i]->basename) {
1362                         prev_i = i;
1363                         break;
1364                 }
1365         }
1366         while (++i < flist->count) {
1367                 if (!flist->files[i]->basename)
1368                         continue;
1369                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1370                         if (verbose > 1 && !am_server) {
1371                                 rprintf(FINFO,
1372                                         "removing duplicate name %s from file list %d\n",
1373                                         f_name(flist->files[i]), i);
1374                         }
1375                         /* Make sure that if we unduplicate '.', that we don't
1376                          * lose track of a user-specified starting point (or
1377                          * else deletions will mysteriously fail with -R). */
1378                         if (flist->files[i]->flags & FLAG_DELETE)
1379                                 flist->files[prev_i]->flags |= FLAG_DELETE;
1380                         /* it's not great that the flist knows the semantics of
1381                          * the file memory usage, but i'd rather not add a flag
1382                          * byte to that struct.
1383                          * XXX can i use a bit in the flags field? */
1384                         if (flist->string_area)
1385                                 flist->files[i][0] = null_file;
1386                         else
1387                                 free_file(flist->files[i]);
1388                 }
1389                 else
1390                         prev_i = i;
1391         }
1392
1393         if (strip_root) {
1394                 /* we need to strip off the root directory in the case
1395                    of relative paths, but this must be done _after_
1396                    the sorting phase */
1397                 for (i = 0; i < flist->count; i++) {
1398                         if (flist->files[i]->dirname &&
1399                             flist->files[i]->dirname[0] == '/') {
1400                                 memmove(&flist->files[i]->dirname[0],
1401                                         &flist->files[i]->dirname[1],
1402                                         strlen(flist->files[i]->dirname));
1403                         }
1404
1405                         if (flist->files[i]->dirname &&
1406                             !flist->files[i]->dirname[0]) {
1407                                 flist->files[i]->dirname = NULL;
1408                         }
1409                 }
1410         }
1411
1412         if (verbose <= 3)
1413                 return;
1414
1415         for (i = 0; i < flist->count; i++) {
1416                 rprintf(FINFO, "[%ld] i=%d %s %s mode=0%o len=%.0f\n",
1417                         (long) getpid(), i,
1418                         NS(flist->files[i]->dirname),
1419                         NS(flist->files[i]->basename),
1420                         (int) flist->files[i]->mode,
1421                         (double) flist->files[i]->length);
1422         }
1423 }
1424
1425
1426 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1427
1428 /* Compare the names of two file_struct entities, just like strcmp()
1429  * would do if it were operating on the joined strings.  We assume
1430  * that there are no 0-length strings.
1431  */
1432 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1433 {
1434         int dif;
1435         const uchar *c1, *c2;
1436         enum fnc_state state1, state2;
1437
1438         if (!f1 || !f1->basename) {
1439                 if (!f2 || !f2->basename)
1440                         return 0;
1441                 return -1;
1442         }
1443         if (!f2 || !f2->basename)
1444                 return 1;
1445
1446         if (!(c1 = (uchar*)f1->dirname)) {
1447                 state1 = fnc_BASE;
1448                 c1 = (uchar*)f1->basename;
1449         }
1450         else
1451                 state1 = fnc_DIR;
1452         if (!(c2 = (uchar*)f2->dirname)) {
1453                 state2 = fnc_BASE;
1454                 c2 = (uchar*)f2->basename;
1455         }
1456         else
1457                 state2 = fnc_DIR;
1458
1459         while (1) {
1460                 if ((dif = (int)*c1 - (int)*c2) != 0)
1461                         break;
1462                 if (!*++c1) {
1463                         switch (state1) {
1464                         case fnc_DIR:
1465                                 state1 = fnc_SLASH;
1466                                 c1 = (uchar*)"/";
1467                                 break;
1468                         case fnc_SLASH:
1469                                 state1 = fnc_BASE;
1470                                 c1 = (uchar*)f1->basename;
1471                                 break;
1472                         case fnc_BASE:
1473                                 break;
1474                         }
1475                 }
1476                 if (!*++c2) {
1477                         switch (state2) {
1478                         case fnc_DIR:
1479                                 state2 = fnc_SLASH;
1480                                 c2 = (uchar*)"/";
1481                                 break;
1482                         case fnc_SLASH:
1483                                 state2 = fnc_BASE;
1484                                 c2 = (uchar*)f2->basename;
1485                                 break;
1486                         case fnc_BASE:
1487                                 if (!*c1)
1488                                         return 0;
1489                                 break;
1490                         }
1491                 }
1492         }
1493
1494         return dif;
1495 }
1496
1497
1498 /* Return a copy of the full filename of a flist entry, using the indicated
1499  * buffer.
1500  */
1501 char *f_name_to(struct file_struct *f, char *fbuf, int bsize)
1502 {
1503         if (!f || !f->basename)
1504                 return NULL;
1505
1506         if (f->dirname) {
1507                 int off = strlcpy(fbuf, f->dirname, bsize);
1508                 off += strlcpy(fbuf + off, "/", bsize - off);
1509                 strlcpy(fbuf + off, f->basename, bsize - off);
1510         } else
1511                 strlcpy(fbuf, f->basename, bsize);
1512         return fbuf;
1513 }
1514
1515
1516 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1517  */
1518 char *f_name(struct file_struct *f)
1519 {
1520         static char names[5][MAXPATHLEN];
1521         static unsigned int n;
1522
1523         n = (n + 1) % (sizeof names / sizeof names[0]);
1524
1525         return f_name_to(f, names[n], sizeof names[0]);
1526 }