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
 355 static void send_file_entry(struct file_struct *file, int f,
 356                             unsigned short base_flags)
 357 {
 358         unsigned short flags;
 359         static time_t modtime;
 360         static mode_t mode;
 361         static DEV64_T rdev;    /* just high bytes in p28 onward */
 362         static uid_t uid;
 363         static gid_t gid;
 364         static DEV64_T dev;
 365         static char lastname[MAXPATHLEN];
 366         char *fname, fbuf[MAXPATHLEN];
 367         int l1, l2;
 368
 369         if (f == -1)
 370                 return;
 371
 372         if (!file) {
 373                 write_byte(f, 0);
 374                 return;
 375         }
 376
 377         io_write_phase = "send_file_entry";
 378
 379         fname = f_name_to(file, fbuf, sizeof fbuf);
 380
 381         flags = base_flags;
 382
 383         if (file->mode == mode)
 384                 flags |= SAME_MODE;
 385         else
 386                 mode = file->mode;
 387         if (preserve_devices) {
 388                 if (protocol_version < 28) {
 389                         if (IS_DEVICE(mode) && file->rdev == rdev) {
 390                                 /* Set both flags so that the test when
 391                                  * writing the data is simpler. */
 392                                 flags |= SAME_RDEV_pre28|SAME_HIGH_RDEV;
 393                         }
 394                         else
 395                                 rdev = file->rdev;
 396                 }
 397                 else if (IS_DEVICE(mode)) {
 398                         if ((file->rdev & ~0xFF) == rdev)
 399                                 flags |= SAME_HIGH_RDEV;
 400                         else
 401                                 rdev = file->rdev & ~0xFF;
 402                 }
 403         }
 404         if (file->uid == uid)
 405                 flags |= SAME_UID;
 406         else
 407                 uid = file->uid;
 408         if (file->gid == gid)
 409                 flags |= SAME_GID;
 410         else
 411                 gid = file->gid;
 412         if (file->modtime == modtime)
 413                 flags |= SAME_TIME;
 414         else
 415                 modtime = file->modtime;
 416         if (file->flags & HAS_INODE_DATA) {
 417                 if (file->dev == dev) {
 418                         if (protocol_version >= 28)
 419                                 flags |= SAME_DEV;
 420                 }
 421                 else
 422                         dev = file->dev;
 423                 flags |= HAS_INODE_DATA;
 424         }
 425
 426         for (l1 = 0;
 427              lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 428              l1++) {}
 429         l2 = strlen(fname) - l1;
 430
 431         if (l1 > 0)
 432                 flags |= SAME_NAME;
 433         if (l2 > 255)
 434                 flags |= LONG_NAME;
 435
 436         /* We must make sure we don't send a zero flags byte or
 437          * the other end will terminate the flist transfer. */
 438         if (flags == 0 && !S_ISDIR(mode))
 439                 flags |= FLAG_DELETE; /* NOTE: no meaning for non-dir */
 440         if (protocol_version >= 28) {
 441                 if ((flags & 0xFF00) || flags == 0) {
 442                         flags |= EXTENDED_FLAGS;
 443                         write_byte(f, flags);
 444                         write_byte(f, flags >> 8);
 445                 } else
 446                         write_byte(f, flags);
 447         } else {
 448                 if (flags == 0)
 449                         flags |= LONG_NAME;
 450                 write_byte(f, flags);
 451         }
 452         if (flags & SAME_NAME)
 453                 write_byte(f, l1);
 454         if (flags & LONG_NAME)
 455                 write_int(f, l2);
 456         else
 457                 write_byte(f, l2);
 458         write_buf(f, fname + l1, l2);
 459
 460         write_longint(f, file->length);
 461         if (!(flags & SAME_TIME))
 462                 write_int(f, modtime);
 463         if (!(flags & SAME_MODE))
 464                 write_int(f, to_wire_mode(mode));
 465         if (preserve_uid && !(flags & SAME_UID)) {
 466                 add_uid(uid);
 467                 write_int(f, uid);
 468         }
 469         if (preserve_gid && !(flags & SAME_GID)) {
 470                 add_gid(gid);
 471                 write_int(f, gid);
 472         }
 473         if (preserve_devices && IS_DEVICE(mode)) {
 474                 /* If SAME_HIGH_RDEV is off, SAME_RDEV_pre28 is also off.
 475                  * Also, avoid using "rdev" because it may be incomplete. */
 476                 if (!(flags & SAME_HIGH_RDEV))
 477                         write_int(f, file->rdev);
 478                 else if (protocol_version >= 28)
 479                         write_byte(f, file->rdev);
 480         }
 481
 482 #if SUPPORT_LINKS
 483         if (preserve_links && S_ISLNK(mode)) {
 484                 write_int(f, strlen(file->link));
 485                 write_buf(f, file->link, strlen(file->link));
 486         }
 487 #endif
 488
 489 #if SUPPORT_HARD_LINKS
 490         if (flags & HAS_INODE_DATA) {
 491                 if (protocol_version < 26) {
 492                         /* 32-bit dev_t and ino_t */
 493                         write_int(f, dev);
 494                         write_int(f, file->inode);
 495                 } else {
 496                         /* 64-bit dev_t and ino_t */
 497                         if (!(flags & SAME_DEV))
 498                                 write_longint(f, dev);
 499                         write_longint(f, file->inode);
 500                 }
 501         }
 502 #endif
 503
 504         if (always_checksum && (protocol_version < 28 || S_ISREG(mode))) {
 505                 char *sum = file->sum? file->sum : empty_sum;
 506                 write_buf(f, sum, protocol_version < 21? 2
 507                                                 : MD4_SUM_LENGTH);
 508         }
 509
 510         strlcpy(lastname, fname, MAXPATHLEN);
 511         lastname[MAXPATHLEN - 1] = 0;
 512
 513         io_write_phase = "unknown";
 514 }
 515
 516
 517
 518 static void receive_file_entry(struct file_struct **fptr,
 519                                unsigned short flags, int f)
 520 {
 521         static time_t modtime;
 522         static mode_t mode;
 523         static DEV64_T rdev;    /* just high bytes in p28 onward */
 524         static uid_t uid;
 525         static gid_t gid;
 526         static DEV64_T dev;
 527         static char lastname[MAXPATHLEN];
 528         char thisname[MAXPATHLEN];
 529         unsigned int l1 = 0, l2 = 0;
 530         char *p;
 531         struct file_struct *file;
 532
 533         if (flags & SAME_NAME)
 534                 l1 = read_byte(f);
 535
 536         if (flags & LONG_NAME)
 537                 l2 = read_int(f);
 538         else
 539                 l2 = read_byte(f);
 540
 541         file = new(struct file_struct);
 542         if (!file)
 543                 out_of_memory("receive_file_entry");
 544         memset((char *) file, 0, sizeof(*file));
 545         (*fptr) = file;
 546
 547         if (l2 >= MAXPATHLEN - l1) {
 548                 rprintf(FERROR,
 549                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 550                         flags, l1, l2, lastname);
 551                 overflow("receive_file_entry");
 552         }
 553
 554         strlcpy(thisname, lastname, l1 + 1);
 555         read_sbuf(f, &thisname[l1], l2);
 556         thisname[l1 + l2] = 0;
 557
 558         strlcpy(lastname, thisname, MAXPATHLEN);
 559         lastname[MAXPATHLEN - 1] = 0;
 560
 561         clean_fname(thisname);
 562
 563         if (sanitize_paths) {
 564                 sanitize_path(thisname, NULL);
 565         }
 566
 567         if ((p = strrchr(thisname, '/'))) {
 568                 static char *lastdir;
 569                 *p = 0;
 570                 if (lastdir && strcmp(thisname, lastdir) == 0)
 571                         file->dirname = lastdir;
 572                 else {
 573                         file->dirname = strdup(thisname);
 574                         lastdir = file->dirname;
 575                 }
 576                 file->basename = strdup(p + 1);
 577         } else {
 578                 file->dirname = NULL;
 579                 file->basename = strdup(thisname);
 580         }
 581
 582         if (!file->basename)
 583                 out_of_memory("receive_file_entry 1");
 584
 585         file->flags = flags;
 586         file->length = read_longint(f);
 587         if (!(flags & SAME_TIME))
 588                 modtime = (time_t)read_int(f);
 589         file->modtime = modtime;
 590         if (!(flags & SAME_MODE))
 591                 mode = from_wire_mode(read_int(f));
 592         file->mode = mode;
 593
 594         if (preserve_uid) {
 595                 if (!(flags & SAME_UID))
 596                         uid = (uid_t)read_int(f);
 597                 file->uid = uid;
 598         }
 599         if (preserve_gid) {
 600                 if (!(flags & SAME_GID))
 601                         gid = (gid_t)read_int(f);
 602                 file->gid = gid;
 603         }
 604         if (preserve_devices) {
 605                 if (protocol_version < 28) {
 606                         if (IS_DEVICE(mode)) {
 607                                 if (!(flags & SAME_RDEV_pre28))
 608                                         rdev = (DEV64_T)read_int(f);
 609                                 file->rdev = rdev;
 610                         } else
 611                                 rdev = 0;
 612                 } else if (IS_DEVICE(mode)) {
 613                         if (!(flags & SAME_HIGH_RDEV)) {
 614                                 file->rdev = (DEV64_T)read_int(f);
 615                                 rdev = file->rdev & ~0xFF;
 616                         } else
 617                                 file->rdev = rdev | (DEV64_T)read_byte(f);
 618                 }
 619         }
 620
 621         if (preserve_links && S_ISLNK(mode)) {
 622                 int l = read_int(f);
 623                 if (l < 0) {
 624                         rprintf(FERROR, "overflow: l=%d\n", l);
 625                         overflow("receive_file_entry");
 626                 }
 627                 file->link = new_array(char, l + 1);
 628                 if (!file->link)
 629                         out_of_memory("receive_file_entry 2");
 630                 read_sbuf(f, file->link, l);
 631                 if (sanitize_paths)
 632                         sanitize_path(file->link, file->dirname);
 633         }
 634 #if SUPPORT_HARD_LINKS
 635         if (preserve_hard_links && protocol_version < 28
 636             && S_ISREG(mode))
 637                 file->flags |= HAS_INODE_DATA;
 638         if (file->flags & HAS_INODE_DATA) {
 639                 if (protocol_version < 26) {
 640                         dev = read_int(f);
 641                         file->inode = read_int(f);
 642                 } else {
 643                         if (!(flags & SAME_DEV))
 644                                 dev = read_longint(f);
 645                         file->inode = read_longint(f);
 646                 }
 647                 file->dev = dev;
 648         }
 649 #endif
 650
 651         if (always_checksum) {
 652                 char tmpsum[MD4_SUM_LENGTH], *sum;
 653                 if (S_ISREG(mode)) {
 654                         sum = file->sum = new_array(char, MD4_SUM_LENGTH);
 655                         if (!sum)
 656                                 out_of_memory("md4 sum");
 657                 } else if (protocol_version < 28) {
 658                         /* Prior to 28, we get a useless set of nulls. */
 659                         sum = tmpsum;
 660                 } else
 661                         sum = NULL;
 662                 if (sum) {
 663                         read_buf(f, sum, protocol_version < 21? 2
 664                                                 : MD4_SUM_LENGTH);
 665                 }
 666         }
 667
 668         if (!preserve_perms) {
 669                 extern int orig_umask;
 670                 /* set an appropriate set of permissions based on original
 671                  * permissions and umask. This emulates what GNU cp does */
 672                 file->mode &= ~orig_umask;
 673         }
 674 }
 675
 676
 677 /* determine if a file in a different filesstem should be skipped
 678    when one_file_system is set. We bascally only want to include
 679    the mount points - but they can be hard to find! */
 680 static int skip_filesystem(char *fname, STRUCT_STAT * st)
 681 {
 682         STRUCT_STAT st2;
 683         char *p = strrchr(fname, '/');
 684
 685         /* skip all but directories */
 686         if (!S_ISDIR(st->st_mode))
 687                 return 1;
 688
 689         /* if its not a subdirectory then allow */
 690         if (!p)
 691                 return 0;
 692
 693         *p = 0;
 694         if (link_stat(fname, &st2)) {
 695                 *p = '/';
 696                 return 0;
 697         }
 698         *p = '/';
 699
 700         return (st2.st_dev != filesystem_dev);
 701 }
 702
 703 #define STRDUP(ap, p)   (ap ? string_area_strdup(ap, p) : strdup(p))
 704 /* IRIX cc cares that the operands to the ternary have the same type. */
 705 #define MALLOC(ap, i)   (ap ? (void*) string_area_malloc(ap, i) : malloc(i))
 706
 707 /**
 708  * Create a file_struct for a named file by reading its stat()
 709  * information and performing extensive checks against global
 710  * options.
 711  *
 712  * @return the new file, or NULL if there was an error or this file
 713  * should be excluded.
 714  *
 715  * @todo There is a small optimization opportunity here to avoid
 716  * stat()ing the file in some circumstances, which has a certain cost.
 717  * We are called immediately after doing readdir(), and so we may
 718  * already know the d_type of the file.  We could for example avoid
 719  * statting directories if we're not recursing, but this is not a very
 720  * important case.  Some systems may not have d_type.
 721  **/
 722 struct file_struct *make_file(char *fname, struct string_area **ap,
 723                               int exclude_level)
 724 {
 725         struct file_struct *file;
 726         STRUCT_STAT st;
 727         char sum[SUM_LENGTH];
 728         char *p;
 729         char cleaned_name[MAXPATHLEN];
 730         char linkbuf[MAXPATHLEN];
 731         extern int module_id;
 732
 733         strlcpy(cleaned_name, fname, MAXPATHLEN);
 734         cleaned_name[MAXPATHLEN - 1] = 0;
 735         clean_fname(cleaned_name);
 736         if (sanitize_paths)
 737                 sanitize_path(cleaned_name, NULL);
 738         fname = cleaned_name;
 739
 740         memset(sum, 0, SUM_LENGTH);
 741
 742         if (readlink_stat(fname, &st, linkbuf) != 0) {
 743                 int save_errno = errno;
 744                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
 745                         /* either symlink pointing nowhere or file that
 746                          * was removed during rsync run; see if excluded
 747                          * before reporting an error */
 748                         if (check_exclude_file(fname, 0, exclude_level)) {
 749                                 /* file is excluded anyway, ignore silently */
 750                                 return NULL;
 751                         }
 752                 }
 753                 io_error |= IOERR_GENERAL;
 754                 rprintf(FERROR, "readlink %s failed: %s\n",
 755                         full_fname(fname), strerror(save_errno));
 756                 return NULL;
 757         }
 758
 759         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 760         if (exclude_level == NO_EXCLUDES)
 761                 goto skip_excludes;
 762
 763         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 764                 rprintf(FINFO, "skipping directory %s\n", fname);
 765                 return NULL;
 766         }
 767
 768         if (one_file_system && st.st_dev != filesystem_dev) {
 769                 if (skip_filesystem(fname, &st))
 770                         return NULL;
 771         }
 772
 773         if (check_exclude_file(fname, S_ISDIR(st.st_mode) != 0, exclude_level))
 774                 return NULL;
 775
 776         if (lp_ignore_nonreadable(module_id) && access(fname, R_OK) != 0)
 777                 return NULL;
 778
 779       skip_excludes:
 780
 781         if (verbose > 2)
 782                 rprintf(FINFO, "make_file(%s,*,%d)\n", fname, exclude_level);
 783
 784         file = new(struct file_struct);
 785         if (!file)
 786                 out_of_memory("make_file");
 787         memset((char *) file, 0, sizeof(*file));
 788
 789         if ((p = strrchr(fname, '/'))) {
 790                 static char *lastdir;
 791                 *p = 0;
 792                 if (lastdir && strcmp(fname, lastdir) == 0)
 793                         file->dirname = lastdir;
 794                 else {
 795                         file->dirname = strdup(fname);
 796                         lastdir = file->dirname;
 797                 }
 798                 file->basename = STRDUP(ap, p + 1);
 799                 *p = '/';
 800         } else {
 801                 file->dirname = NULL;
 802                 file->basename = STRDUP(ap, fname);
 803         }
 804
 805         file->modtime = st.st_mtime;
 806         file->length = st.st_size;
 807         file->mode = st.st_mode;
 808         file->uid = st.st_uid;
 809         file->gid = st.st_gid;
 810         if (preserve_hard_links) {
 811                 if (protocol_version < 28? S_ISREG(st.st_mode)
 812                     : !S_ISDIR(st.st_mode) && st.st_nlink > 1) {
 813                         file->dev = st.st_dev;
 814                         file->inode = st.st_ino;
 815                         file->flags |= HAS_INODE_DATA;
 816                 }
 817         }
 818 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 819         file->rdev = st.st_rdev;
 820 #endif
 821
 822 #if SUPPORT_LINKS
 823         if (S_ISLNK(st.st_mode))
 824                 file->link = STRDUP(ap, linkbuf);
 825 #endif
 826
 827         if (always_checksum && S_ISREG(st.st_mode)) {
 828                 file->sum = (char*)MALLOC(ap, MD4_SUM_LENGTH);
 829                 if (!file->sum)
 830                         out_of_memory("md4 sum");
 831                 file_checksum(fname, file->sum, st.st_size);
 832         }
 833
 834         if (flist_dir) {
 835                 static char *lastdir;
 836                 if (lastdir && strcmp(lastdir, flist_dir) == 0)
 837                         file->basedir = lastdir;
 838                 else {
 839                         file->basedir = strdup(flist_dir);
 840                         lastdir = file->basedir;
 841                 }
 842         } else
 843                 file->basedir = NULL;
 844
 845         if (!S_ISDIR(st.st_mode))
 846                 stats.total_size += st.st_size;
 847
 848         return file;
 849 }
 850
 851
 852 void send_file_name(int f, struct file_list *flist, char *fname,
 853                     int recursive, unsigned short base_flags)
 854 {
 855         struct file_struct *file;
 856         char fbuf[MAXPATHLEN];
 857         extern int delete_excluded;
 858
 859         /* f is set to -1 when calculating deletion file list */
 860         file = make_file(fname, &flist->string_area,
 861                          f == -1 && delete_excluded? SERVER_EXCLUDES
 862                                                    : ALL_EXCLUDES);
 863
 864         if (!file)
 865                 return;
 866
 867         maybe_emit_filelist_progress(flist);
 868
 869         flist_expand(flist);
 870
 871         if (write_batch)
 872                 file->flags |= FLAG_DELETE;
 873
 874         if (file->basename[0]) {
 875                 flist->files[flist->count++] = file;
 876                 send_file_entry(file, f, base_flags);
 877         }
 878
 879         if (S_ISDIR(file->mode) && recursive) {
 880                 struct exclude_struct **last_exclude_list =
 881                     local_exclude_list;
 882                 send_directory(f, flist, f_name_to(file, fbuf, sizeof fbuf));
 883                 local_exclude_list = last_exclude_list;
 884                 return;
 885         }
 886 }
 887
 888
 889 static void send_directory(int f, struct file_list *flist, char *dir)
 890 {
 891         DIR *d;
 892         struct dirent *di;
 893         char fname[MAXPATHLEN];
 894         int l;
 895         char *p;
 896
 897         d = opendir(dir);
 898         if (!d) {
 899                 io_error |= IOERR_GENERAL;
 900                 rprintf(FERROR, "opendir %s failed: %s\n",
 901                         full_fname(dir), strerror(errno));
 902                 return;
 903         }
 904
 905         strlcpy(fname, dir, MAXPATHLEN);
 906         l = strlen(fname);
 907         if (fname[l - 1] != '/') {
 908                 if (l == MAXPATHLEN - 1) {
 909                         io_error |= IOERR_GENERAL;
 910                         rprintf(FERROR, "skipping long-named directory: %s\n",
 911                                 full_fname(fname));
 912                         closedir(d);
 913                         return;
 914                 }
 915                 strlcat(fname, "/", MAXPATHLEN);
 916                 l++;
 917         }
 918         p = fname + strlen(fname);
 919
 920         local_exclude_list = NULL;
 921
 922         if (cvs_exclude) {
 923                 if (strlen(fname) + strlen(".cvsignore") <= MAXPATHLEN - 1) {
 924                         strcpy(p, ".cvsignore");
 925                         add_exclude_file(&exclude_list,fname,MISSING_OK,ADD_EXCLUDE);
 926                 } else {
 927                         io_error |= IOERR_GENERAL;
 928                         rprintf(FINFO,
 929                                 "cannot cvs-exclude in long-named directory %s\n",
 930                                 full_fname(fname));
 931                 }
 932         }
 933
 934         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 935                 char *dname = d_name(di);
 936                 if (dname[0] == '.' && (dname[1] == '\0'
 937                     || (dname[1] == '.' && dname[2] == '\0')))
 938                         continue;
 939                 strlcpy(p, dname, MAXPATHLEN - l);
 940                 send_file_name(f, flist, fname, recurse, 0);
 941         }
 942         if (errno) {
 943                 io_error |= IOERR_GENERAL;
 944                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
 945                     dir, errno, strerror(errno));
 946         }
 947
 948         if (local_exclude_list)
 949                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
 950
 951         closedir(d);
 952 }
 953
 954
 955 /**
 956  * The delete_files() function in receiver.c sets f to -1 so that we just
 957  * construct the file list in memory without sending it over the wire.  It
 958  * also has the side-effect of ignoring user-excludes if delete_excluded
 959  * is set (so that the delete list includes user-excluded files).
 960  **/
 961 struct file_list *send_file_list(int f, int argc, char *argv[])
 962 {
 963         int l;
 964         STRUCT_STAT st;
 965         char *p, *dir, *olddir;
 966         char lastpath[MAXPATHLEN] = "";
 967         struct file_list *flist;
 968         int64 start_write;
 969         int use_ff_fd = 0;
 970
 971         if (show_filelist_p() && f != -1)
 972                 start_filelist_progress("building file list");
 973
 974         start_write = stats.total_written;
 975
 976         flist = flist_new();
 977
 978         if (f != -1) {
 979                 io_start_buffering_out(f);
 980                 if (filesfrom_fd >= 0) {
 981                         if (argv[0] && !push_dir(argv[0], 0)) {
 982                                 rprintf(FERROR, "push_dir %s failed: %s\n",
 983                                         full_fname(argv[0]), strerror(errno));
 984                                 exit_cleanup(RERR_FILESELECT);
 985                         }
 986                         use_ff_fd = 1;
 987                 }
 988         }
 989
 990         while (1) {
 991                 char fname2[MAXPATHLEN];
 992                 char *fname = fname2;
 993
 994                 if (use_ff_fd) {
 995                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
 996                                 break;
 997                         sanitize_path(fname, NULL);
 998                 } else {
 999                         if (argc-- == 0)
1000                                 break;
1001                         strlcpy(fname, *argv++, MAXPATHLEN);
1002                         if (sanitize_paths)
1003                                 sanitize_path(fname, NULL);
1004                 }
1005
1006                 l = strlen(fname);
1007                 if (fname[l - 1] == '/') {
1008                         if (l == 2 && fname[0] == '.') {
1009                                 /* Turn "./" into just "." rather than "./." */
1010                                 fname[1] = '\0';
1011                         } else {
1012                                 strlcat(fname, ".", MAXPATHLEN);
1013                         }
1014                 }
1015
1016                 if (link_stat(fname, &st) != 0) {
1017                         if (f != -1) {
1018                                 io_error |= IOERR_GENERAL;
1019                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1020                                         full_fname(fname), strerror(errno));
1021                         }
1022                         continue;
1023                 }
1024
1025                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1026                         rprintf(FINFO, "skipping directory %s\n", fname);
1027                         continue;
1028                 }
1029
1030                 dir = NULL;
1031                 olddir = NULL;
1032
1033                 if (!relative_paths) {
1034                         p = strrchr(fname, '/');
1035                         if (p) {
1036                                 *p = 0;
1037                                 if (p == fname)
1038                                         dir = "/";
1039                                 else
1040                                         dir = fname;
1041                                 fname = p + 1;
1042                         }
1043                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1044                         /* this ensures we send the intermediate directories,
1045                            thus getting their permissions right */
1046                         char *lp = lastpath, *fn = fname, *slash = fname;
1047                         *p = 0;
1048                         /* Skip any initial directories in our path that we
1049                          * have in common with lastpath. */
1050                         while (*fn && *lp == *fn) {
1051                                 if (*fn == '/')
1052                                         slash = fn;
1053                                 lp++, fn++;
1054                         }
1055                         *p = '/';
1056                         if (fn != p || (*lp && *lp != '/')) {
1057                                 int copy_links_saved = copy_links;
1058                                 int recurse_saved = recurse;
1059                                 copy_links = copy_unsafe_links;
1060                                 /* set recurse to 1 to prevent make_file
1061                                  * from ignoring directory, but still
1062                                  * turn off the recursive parameter to
1063                                  * send_file_name */
1064                                 recurse = 1;
1065                                 while ((slash = strchr(slash+1, '/')) != 0) {
1066                                         *slash = 0;
1067                                         send_file_name(f, flist, fname, 0, 0);
1068                                         *slash = '/';
1069                                 }
1070                                 copy_links = copy_links_saved;
1071                                 recurse = recurse_saved;
1072                                 *p = 0;
1073                                 strlcpy(lastpath, fname, sizeof lastpath);
1074                                 *p = '/';
1075                         }
1076                 }
1077
1078                 if (!*fname)
1079                         fname = ".";
1080
1081                 if (dir && *dir) {
1082                         olddir = push_dir(dir, 1);
1083
1084                         if (!olddir) {
1085                                 io_error |= IOERR_GENERAL;
1086                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1087                                         full_fname(dir), strerror(errno));
1088                                 continue;
1089                         }
1090
1091                         flist_dir = dir;
1092                 }
1093
1094                 if (one_file_system)
1095                         set_filesystem(fname);
1096
1097                 send_file_name(f, flist, fname, recurse, FLAG_DELETE);
1098
1099                 if (olddir != NULL) {
1100                         flist_dir = NULL;
1101                         if (pop_dir(olddir) != 0) {
1102                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1103                                         full_fname(dir), strerror(errno));
1104                                 exit_cleanup(RERR_FILESELECT);
1105                         }
1106                 }
1107         }
1108
1109         if (f != -1)
1110                 send_file_entry(NULL, f, 0);
1111
1112         if (show_filelist_p() && f != -1)
1113                 finish_filelist_progress(flist);
1114
1115         clean_flist(flist, 0, 0);
1116
1117         /* now send the uid/gid list. This was introduced in protocol
1118            version 15 */
1119         if (f != -1)
1120                 send_uid_list(f);
1121
1122         /* send the io_error flag */
1123         if (f != -1) {
1124                 extern int module_id;
1125                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1126         }
1127
1128         if (f != -1) {
1129                 io_end_buffering();
1130                 stats.flist_size = stats.total_written - start_write;
1131                 stats.num_files = flist->count;
1132                 if (write_batch)
1133                         write_batch_flist_info(flist->count, flist->files);
1134         }
1135
1136         if (verbose > 2)
1137                 rprintf(FINFO, "send_file_list done\n");
1138
1139         return flist;
1140 }
1141
1142
1143 struct file_list *recv_file_list(int f)
1144 {
1145         struct file_list *flist;
1146         unsigned short flags;
1147         int64 start_read;
1148         extern int list_only;
1149
1150         if (show_filelist_p())
1151                 start_filelist_progress("receiving file list");
1152
1153         start_read = stats.total_read;
1154
1155         flist = new(struct file_list);
1156         if (!flist)
1157                 goto oom;
1158
1159         flist->count = 0;
1160         flist->malloced = 1000;
1161         flist->files = new_array(struct file_struct *, flist->malloced);
1162         if (!flist->files)
1163                 goto oom;
1164
1165
1166         while ((flags = read_byte(f)) != 0) {
1167                 int i = flist->count;
1168
1169                 flist_expand(flist);
1170
1171                 if (protocol_version >= 28 && (flags & EXTENDED_FLAGS))
1172                         flags |= read_byte(f) << 8;
1173                 receive_file_entry(&flist->files[i], flags, f);
1174
1175                 if (S_ISREG(flist->files[i]->mode))
1176                         stats.total_size += flist->files[i]->length;
1177
1178                 flist->count++;
1179
1180                 maybe_emit_filelist_progress(flist);
1181
1182                 if (verbose > 2) {
1183                         rprintf(FINFO, "recv_file_name(%s)\n",
1184                                 f_name(flist->files[i]));
1185                 }
1186         }
1187
1188
1189         if (verbose > 2)
1190                 rprintf(FINFO, "received %d names\n", flist->count);
1191
1192         clean_flist(flist, relative_paths, 1);
1193
1194         if (show_filelist_p())
1195                 finish_filelist_progress(flist);
1196
1197         /* now recv the uid/gid list. This was introduced in protocol version 15 */
1198         if (f != -1)
1199                 recv_uid_list(f, flist);
1200
1201         /* recv the io_error flag */
1202         if (f != -1 && !read_batch) {   /* dw-added readbatch */
1203                 extern int module_id;
1204                 extern int ignore_errors;
1205                 if (lp_ignore_errors(module_id) || ignore_errors)
1206                         read_int(f);
1207                 else
1208                         io_error |= read_int(f);
1209         }
1210
1211         if (list_only) {
1212                 int i;
1213                 for (i = 0; i < flist->count; i++)
1214                         list_file_entry(flist->files[i]);
1215         }
1216
1217
1218         if (verbose > 2)
1219                 rprintf(FINFO, "recv_file_list done\n");
1220
1221         stats.flist_size = stats.total_read - start_read;
1222         stats.num_files = flist->count;
1223
1224         return flist;
1225
1226       oom:
1227         out_of_memory("recv_file_list");
1228         return NULL;            /* not reached */
1229 }
1230
1231
1232 int file_compare(struct file_struct **file1, struct file_struct **file2)
1233 {
1234         struct file_struct *f1 = *file1;
1235         struct file_struct *f2 = *file2;
1236
1237         if (!f1->basename && !f2->basename)
1238                 return 0;
1239         if (!f1->basename)
1240                 return -1;
1241         if (!f2->basename)
1242                 return 1;
1243         if (f1->dirname == f2->dirname)
1244                 return u_strcmp(f1->basename, f2->basename);
1245         return f_name_cmp(f1, f2);
1246 }
1247
1248
1249 int flist_find(struct file_list *flist, struct file_struct *f)
1250 {
1251         int low = 0, high = flist->count - 1;
1252
1253         while (high >= 0 && !flist->files[high]->basename) high--;
1254
1255         if (high < 0)
1256                 return -1;
1257
1258         while (low != high) {
1259                 int mid = (low + high) / 2;
1260                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1261                 if (ret == 0)
1262                         return flist_up(flist, mid);
1263                 if (ret > 0)
1264                         high = mid;
1265                 else
1266                         low = mid + 1;
1267         }
1268
1269         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1270                 return flist_up(flist, low);
1271         return -1;
1272 }
1273
1274
1275 /*
1276  * free up one file
1277  */
1278 void free_file(struct file_struct *file)
1279 {
1280         if (!file)
1281                 return;
1282         if (file->basename)
1283                 free(file->basename);
1284         if (file->link)
1285                 free(file->link);
1286         if (file->sum)
1287                 free(file->sum);
1288         *file = null_file;
1289 }
1290
1291
1292 /*
1293  * allocate a new file list
1294  */
1295 struct file_list *flist_new(void)
1296 {
1297         struct file_list *flist;
1298
1299         flist = new(struct file_list);
1300         if (!flist)
1301                 out_of_memory("send_file_list");
1302
1303         flist->count = 0;
1304         flist->malloced = 0;
1305         flist->files = NULL;
1306
1307 #if ARENA_SIZE > 0
1308         flist->string_area = string_area_new(0);
1309 #else
1310         flist->string_area = NULL;
1311 #endif
1312         return flist;
1313 }
1314
1315 /*
1316  * free up all elements in a flist
1317  */
1318 void flist_free(struct file_list *flist)
1319 {
1320         int i;
1321         for (i = 1; i < flist->count; i++) {
1322                 if (!flist->string_area)
1323                         free_file(flist->files[i]);
1324                 free(flist->files[i]);
1325         }
1326         /* FIXME: I don't think we generally need to blank the flist
1327          * since it's about to be freed.  This will just cause more
1328          * memory traffic.  If you want a freed-memory debugger, you
1329          * know where to get it. */
1330         memset((char *) flist->files, 0,
1331                sizeof(flist->files[0]) * flist->count);
1332         free(flist->files);
1333         if (flist->string_area)
1334                 string_area_free(flist->string_area);
1335         memset((char *) flist, 0, sizeof(*flist));
1336         free(flist);
1337 }
1338
1339
1340 /*
1341  * This routine ensures we don't have any duplicate names in our file list.
1342  * duplicate names can cause corruption because of the pipelining
1343  */
1344 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1345 {
1346         int i, prev_i = 0;
1347
1348         if (!flist || flist->count == 0)
1349                 return;
1350
1351         qsort(flist->files, flist->count,
1352               sizeof(flist->files[0]), (int (*)()) file_compare);
1353
1354         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1355                 if (flist->files[i]->basename) {
1356                         prev_i = i;
1357                         break;
1358                 }
1359         }
1360         while (++i < flist->count) {
1361                 if (!flist->files[i]->basename)
1362                         continue;
1363                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1364                         if (verbose > 1 && !am_server) {
1365                                 rprintf(FINFO,
1366                                         "removing duplicate name %s from file list %d\n",
1367                                         f_name(flist->files[i]), i);
1368                         }
1369                         /* Make sure that if we unduplicate '.', that we don't
1370                          * lose track of a user-specified starting point (or
1371                          * else deletions will mysteriously fail with -R). */
1372                         if (flist->files[i]->flags & FLAG_DELETE)
1373                                 flist->files[prev_i]->flags |= FLAG_DELETE;
1374                         /* it's not great that the flist knows the semantics of
1375                          * the file memory usage, but i'd rather not add a flag
1376                          * byte to that struct.
1377                          * XXX can i use a bit in the flags field? */
1378                         if (flist->string_area)
1379                                 flist->files[i][0] = null_file;
1380                         else
1381                                 free_file(flist->files[i]);
1382                 }
1383                 else
1384                         prev_i = i;
1385         }
1386
1387         if (strip_root) {
1388                 /* we need to strip off the root directory in the case
1389                    of relative paths, but this must be done _after_
1390                    the sorting phase */
1391                 for (i = 0; i < flist->count; i++) {
1392                         if (flist->files[i]->dirname &&
1393                             flist->files[i]->dirname[0] == '/') {
1394                                 memmove(&flist->files[i]->dirname[0],
1395                                         &flist->files[i]->dirname[1],
1396                                         strlen(flist->files[i]->dirname));
1397                         }
1398
1399                         if (flist->files[i]->dirname &&
1400                             !flist->files[i]->dirname[0]) {
1401                                 flist->files[i]->dirname = NULL;
1402                         }
1403                 }
1404         }
1405
1406         if (verbose <= 3)
1407                 return;
1408
1409         for (i = 0; i < flist->count; i++) {
1410                 rprintf(FINFO, "[%ld] i=%d %s %s mode=0%o len=%.0f\n",
1411                         (long) getpid(), i,
1412                         NS(flist->files[i]->dirname),
1413                         NS(flist->files[i]->basename),
1414                         (int) flist->files[i]->mode,
1415                         (double) flist->files[i]->length);
1416         }
1417 }
1418
1419
1420 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1421
1422 /* Compare the names of two file_struct entities, just like strcmp()
1423  * would do if it were operating on the joined strings.  We assume
1424  * that there are no 0-length strings.
1425  */
1426 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1427 {
1428         int dif;
1429         const uchar *c1, *c2;
1430         enum fnc_state state1, state2;
1431
1432         if (!f1 || !f1->basename) {
1433                 if (!f2 || !f2->basename)
1434                         return 0;
1435                 return -1;
1436         }
1437         if (!f2 || !f2->basename)
1438                 return 1;
1439
1440         if (!(c1 = (uchar*)f1->dirname)) {
1441                 state1 = fnc_BASE;
1442                 c1 = (uchar*)f1->basename;
1443         }
1444         else
1445                 state1 = fnc_DIR;
1446         if (!(c2 = (uchar*)f2->dirname)) {
1447                 state2 = fnc_BASE;
1448                 c2 = (uchar*)f2->basename;
1449         }
1450         else
1451                 state2 = fnc_DIR;
1452
1453         while (1) {
1454                 if ((dif = (int)*c1 - (int)*c2) != 0)
1455                         break;
1456                 if (!*++c1) {
1457                         switch (state1) {
1458                         case fnc_DIR:
1459                                 state1 = fnc_SLASH;
1460                                 c1 = (uchar*)"/";
1461                                 break;
1462                         case fnc_SLASH:
1463                                 state1 = fnc_BASE;
1464                                 c1 = (uchar*)f1->basename;
1465                                 break;
1466                         case fnc_BASE:
1467                                 break;
1468                         }
1469                 }
1470                 if (!*++c2) {
1471                         switch (state2) {
1472                         case fnc_DIR:
1473                                 state2 = fnc_SLASH;
1474                                 c2 = (uchar*)"/";
1475                                 break;
1476                         case fnc_SLASH:
1477                                 state2 = fnc_BASE;
1478                                 c2 = (uchar*)f2->basename;
1479                                 break;
1480                         case fnc_BASE:
1481                                 if (!*c1)
1482                                         return 0;
1483                                 break;
1484                         }
1485                 }
1486         }
1487
1488         return dif;
1489 }
1490
1491
1492 /* Return a copy of the full filename of a flist entry, using the indicated
1493  * buffer.
1494  */
1495 char *f_name_to(struct file_struct *f, char *fbuf, int bsize)
1496 {
1497         if (!f || !f->basename)
1498                 return NULL;
1499
1500         if (f->dirname) {
1501                 int off = strlcpy(fbuf, f->dirname, bsize);
1502                 off += strlcpy(fbuf + off, "/", bsize - off);
1503                 strlcpy(fbuf + off, f->basename, bsize - off);
1504         } else
1505                 strlcpy(fbuf, f->basename, bsize);
1506         return fbuf;
1507 }
1508
1509
1510 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1511  */
1512 char *f_name(struct file_struct *f)
1513 {
1514         static char names[5][MAXPATHLEN];
1515         static unsigned int n;
1516
1517         n = (n + 1) % (sizeof names / sizeof names[0]);
1518
1519         return f_name_to(f, names[n], sizeof names[0]);
1520 }