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 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 355 {
 356         unsigned short flags;
 357         static time_t modtime;
 358         static mode_t mode;
 359         static DEV64_T rdev;    /* just high bytes in p28 onward */
 360         static DEV64_T dev;
 361         static uid_t uid;
 362         static gid_t gid;
 363         static char lastname[MAXPATHLEN];
 364         char *fname, fbuf[MAXPATHLEN];
 365         int l1, l2;
 366
 367         if (f == -1)
 368                 return;
 369
 370         if (!file) {
 371                 write_byte(f, 0);
 372                 modtime = 0, mode = 0;
 373                 rdev = 0, dev = 0;
 374                 uid = 0, gid = 0;
 375                 *lastname = '\0';
 376                 return;
 377         }
 378
 379         io_write_phase = "send_file_entry";
 380
 381         fname = f_name_to(file, fbuf, sizeof fbuf);
 382
 383         flags = base_flags;
 384
 385         if (file->mode == mode)
 386                 flags |= SAME_MODE;
 387         else
 388                 mode = file->mode;
 389         if (preserve_devices) {
 390                 if (protocol_version < 28) {
 391                         if (IS_DEVICE(mode) && file->rdev == rdev) {
 392                                 /* Set both flags so that the test when
 393                                  * writing the data is simpler. */
 394                                 flags |= SAME_RDEV_pre28|SAME_HIGH_RDEV;
 395                         }
 396                         else
 397                                 rdev = file->rdev;
 398                 }
 399                 else if (IS_DEVICE(mode)) {
 400                         if ((file->rdev & ~0xFF) == rdev)
 401                                 flags |= SAME_HIGH_RDEV;
 402                         else
 403                                 rdev = file->rdev & ~0xFF;
 404                 }
 405         }
 406         if (file->uid == uid)
 407                 flags |= SAME_UID;
 408         else
 409                 uid = file->uid;
 410         if (file->gid == gid)
 411                 flags |= SAME_GID;
 412         else
 413                 gid = file->gid;
 414         if (file->modtime == modtime)
 415                 flags |= SAME_TIME;
 416         else
 417                 modtime = file->modtime;
 418         if (file->flags & HAS_INODE_DATA) {
 419                 if (file->dev == dev) {
 420                         if (protocol_version >= 28)
 421                                 flags |= SAME_DEV;
 422                 }
 423                 else
 424                         dev = file->dev;
 425                 flags |= HAS_INODE_DATA;
 426         }
 427
 428         for (l1 = 0;
 429              lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 430              l1++) {}
 431         l2 = strlen(fname) - l1;
 432
 433         if (l1 > 0)
 434                 flags |= SAME_NAME;
 435         if (l2 > 255)
 436                 flags |= LONG_NAME;
 437
 438         /* We must make sure we don't send a zero flags byte or
 439          * the other end will terminate the flist transfer. */
 440         if (flags == 0 && !S_ISDIR(mode))
 441                 flags |= FLAG_DELETE; /* NOTE: no meaning for non-dir */
 442         if (protocol_version >= 28) {
 443                 if ((flags & 0xFF00) || flags == 0) {
 444                         flags |= EXTENDED_FLAGS;
 445                         write_byte(f, flags);
 446                         write_byte(f, flags >> 8);
 447                 } else
 448                         write_byte(f, flags);
 449         } else {
 450                 if (flags == 0)
 451                         flags |= LONG_NAME;
 452                 write_byte(f, flags);
 453         }
 454         if (flags & SAME_NAME)
 455                 write_byte(f, l1);
 456         if (flags & LONG_NAME)
 457                 write_int(f, l2);
 458         else
 459                 write_byte(f, l2);
 460         write_buf(f, fname + l1, l2);
 461
 462         write_longint(f, file->length);
 463         if (!(flags & SAME_TIME))
 464                 write_int(f, modtime);
 465         if (!(flags & SAME_MODE))
 466                 write_int(f, to_wire_mode(mode));
 467         if (preserve_uid && !(flags & SAME_UID)) {
 468                 add_uid(uid);
 469                 write_int(f, uid);
 470         }
 471         if (preserve_gid && !(flags & SAME_GID)) {
 472                 add_gid(gid);
 473                 write_int(f, gid);
 474         }
 475         if (preserve_devices && IS_DEVICE(mode)) {
 476                 /* If SAME_HIGH_RDEV is off, SAME_RDEV_pre28 is also off.
 477                  * Also, avoid using "rdev" because it may be incomplete. */
 478                 if (!(flags & SAME_HIGH_RDEV))
 479                         write_int(f, file->rdev);
 480                 else if (protocol_version >= 28)
 481                         write_byte(f, file->rdev);
 482         }
 483
 484 #if SUPPORT_LINKS
 485         if (preserve_links && S_ISLNK(mode)) {
 486                 write_int(f, strlen(file->link));
 487                 write_buf(f, file->link, strlen(file->link));
 488         }
 489 #endif
 490
 491 #if SUPPORT_HARD_LINKS
 492         if (flags & HAS_INODE_DATA) {
 493                 if (protocol_version < 26) {
 494                         /* 32-bit dev_t and ino_t */
 495                         write_int(f, dev);
 496                         write_int(f, file->inode);
 497                 } else {
 498                         /* 64-bit dev_t and ino_t */
 499                         if (!(flags & SAME_DEV))
 500                                 write_longint(f, dev);
 501                         write_longint(f, file->inode);
 502                 }
 503         }
 504 #endif
 505
 506         if (always_checksum && (protocol_version < 28 || S_ISREG(mode))) {
 507                 char *sum = file->sum? file->sum : empty_sum;
 508                 write_buf(f, sum, protocol_version < 21? 2
 509                                                 : MD4_SUM_LENGTH);
 510         }
 511
 512         strlcpy(lastname, fname, MAXPATHLEN);
 513         lastname[MAXPATHLEN - 1] = 0;
 514
 515         io_write_phase = "unknown";
 516 }
 517
 518
 519
 520 void receive_file_entry(struct file_struct **fptr, unsigned short flags, int f)
 521 {
 522         static time_t modtime;
 523         static mode_t mode;
 524         static DEV64_T rdev;    /* just high bytes in p28 onward */
 525         static DEV64_T dev;
 526         static uid_t uid;
 527         static gid_t gid;
 528         static char lastname[MAXPATHLEN];
 529         char thisname[MAXPATHLEN];
 530         unsigned int l1 = 0, l2 = 0;
 531         char *p;
 532         struct file_struct *file;
 533
 534         if (!fptr) {
 535                 modtime = 0, mode = 0;
 536                 rdev = 0, dev = 0;
 537                 uid = 0, gid = 0;
 538                 *lastname = '\0';
 539                 return;
 540         }
 541
 542         if (flags & SAME_NAME)
 543                 l1 = read_byte(f);
 544
 545         if (flags & LONG_NAME)
 546                 l2 = read_int(f);
 547         else
 548                 l2 = read_byte(f);
 549
 550         file = new(struct file_struct);
 551         if (!file)
 552                 out_of_memory("receive_file_entry");
 553         memset((char *) file, 0, sizeof(*file));
 554         (*fptr) = file;
 555
 556         if (l2 >= MAXPATHLEN - l1) {
 557                 rprintf(FERROR,
 558                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 559                         flags, l1, l2, lastname);
 560                 overflow("receive_file_entry");
 561         }
 562
 563         strlcpy(thisname, lastname, l1 + 1);
 564         read_sbuf(f, &thisname[l1], l2);
 565         thisname[l1 + l2] = 0;
 566
 567         strlcpy(lastname, thisname, MAXPATHLEN);
 568         lastname[MAXPATHLEN - 1] = 0;
 569
 570         clean_fname(thisname);
 571
 572         if (sanitize_paths) {
 573                 sanitize_path(thisname, NULL);
 574         }
 575
 576         if ((p = strrchr(thisname, '/'))) {
 577                 static char *lastdir;
 578                 *p = 0;
 579                 if (lastdir && strcmp(thisname, lastdir) == 0)
 580                         file->dirname = lastdir;
 581                 else {
 582                         file->dirname = strdup(thisname);
 583                         lastdir = file->dirname;
 584                 }
 585                 file->basename = strdup(p + 1);
 586         } else {
 587                 file->dirname = NULL;
 588                 file->basename = strdup(thisname);
 589         }
 590
 591         if (!file->basename)
 592                 out_of_memory("receive_file_entry 1");
 593
 594         file->flags = flags;
 595         file->length = read_longint(f);
 596         if (!(flags & SAME_TIME))
 597                 modtime = (time_t)read_int(f);
 598         file->modtime = modtime;
 599         if (!(flags & SAME_MODE))
 600                 mode = from_wire_mode(read_int(f));
 601         file->mode = mode;
 602
 603         if (preserve_uid) {
 604                 if (!(flags & SAME_UID))
 605                         uid = (uid_t)read_int(f);
 606                 file->uid = uid;
 607         }
 608         if (preserve_gid) {
 609                 if (!(flags & SAME_GID))
 610                         gid = (gid_t)read_int(f);
 611                 file->gid = gid;
 612         }
 613         if (preserve_devices) {
 614                 if (protocol_version < 28) {
 615                         if (IS_DEVICE(mode)) {
 616                                 if (!(flags & SAME_RDEV_pre28))
 617                                         rdev = (DEV64_T)read_int(f);
 618                                 file->rdev = rdev;
 619                         } else
 620                                 rdev = 0;
 621                 } else if (IS_DEVICE(mode)) {
 622                         if (!(flags & SAME_HIGH_RDEV)) {
 623                                 file->rdev = (DEV64_T)read_int(f);
 624                                 rdev = file->rdev & ~0xFF;
 625                         } else
 626                                 file->rdev = rdev | (DEV64_T)read_byte(f);
 627                 }
 628         }
 629
 630         if (preserve_links && S_ISLNK(mode)) {
 631                 int l = read_int(f);
 632                 if (l < 0) {
 633                         rprintf(FERROR, "overflow: l=%d\n", l);
 634                         overflow("receive_file_entry");
 635                 }
 636                 file->link = new_array(char, l + 1);
 637                 if (!file->link)
 638                         out_of_memory("receive_file_entry 2");
 639                 read_sbuf(f, file->link, l);
 640                 if (sanitize_paths)
 641                         sanitize_path(file->link, file->dirname);
 642         }
 643 #if SUPPORT_HARD_LINKS
 644         if (preserve_hard_links && protocol_version < 28
 645             && S_ISREG(mode))
 646                 file->flags |= HAS_INODE_DATA;
 647         if (file->flags & HAS_INODE_DATA) {
 648                 if (protocol_version < 26) {
 649                         dev = read_int(f);
 650                         file->inode = read_int(f);
 651                 } else {
 652                         if (!(flags & SAME_DEV))
 653                                 dev = read_longint(f);
 654                         file->inode = read_longint(f);
 655                 }
 656                 file->dev = dev;
 657         }
 658 #endif
 659
 660         if (always_checksum) {
 661                 char *sum;
 662                 if (S_ISREG(mode)) {
 663                         sum = file->sum = new_array(char, MD4_SUM_LENGTH);
 664                         if (!sum)
 665                                 out_of_memory("md4 sum");
 666                 } else if (protocol_version < 28) {
 667                         /* Prior to 28, we get a useless set of nulls. */
 668                         sum = empty_sum;
 669                 } else
 670                         sum = NULL;
 671                 if (sum) {
 672                         read_buf(f, sum, protocol_version < 21? 2
 673                                                 : MD4_SUM_LENGTH);
 674                 }
 675         }
 676
 677         if (!preserve_perms) {
 678                 extern int orig_umask;
 679                 /* set an appropriate set of permissions based on original
 680                  * permissions and umask. This emulates what GNU cp does */
 681                 file->mode &= ~orig_umask;
 682         }
 683 }
 684
 685
 686 /* determine if a file in a different filesstem should be skipped
 687    when one_file_system is set. We bascally only want to include
 688    the mount points - but they can be hard to find! */
 689 static int skip_filesystem(char *fname, STRUCT_STAT * st)
 690 {
 691         STRUCT_STAT st2;
 692         char *p = strrchr(fname, '/');
 693
 694         /* skip all but directories */
 695         if (!S_ISDIR(st->st_mode))
 696                 return 1;
 697
 698         /* if its not a subdirectory then allow */
 699         if (!p)
 700                 return 0;
 701
 702         *p = 0;
 703         if (link_stat(fname, &st2)) {
 704                 *p = '/';
 705                 return 0;
 706         }
 707         *p = '/';
 708
 709         return (st2.st_dev != filesystem_dev);
 710 }
 711
 712 #define STRDUP(ap, p)   (ap ? string_area_strdup(ap, p) : strdup(p))
 713 /* IRIX cc cares that the operands to the ternary have the same type. */
 714 #define MALLOC(ap, i)   (ap ? (void*) string_area_malloc(ap, i) : malloc(i))
 715
 716 /**
 717  * Create a file_struct for a named file by reading its stat()
 718  * information and performing extensive checks against global
 719  * options.
 720  *
 721  * @return the new file, or NULL if there was an error or this file
 722  * should be excluded.
 723  *
 724  * @todo There is a small optimization opportunity here to avoid
 725  * stat()ing the file in some circumstances, which has a certain cost.
 726  * We are called immediately after doing readdir(), and so we may
 727  * already know the d_type of the file.  We could for example avoid
 728  * statting directories if we're not recursing, but this is not a very
 729  * important case.  Some systems may not have d_type.
 730  **/
 731 struct file_struct *make_file(char *fname, struct string_area **ap,
 732                               int exclude_level)
 733 {
 734         struct file_struct *file;
 735         STRUCT_STAT st;
 736         char sum[SUM_LENGTH];
 737         char *p;
 738         char cleaned_name[MAXPATHLEN];
 739         char linkbuf[MAXPATHLEN];
 740         extern int module_id;
 741
 742         strlcpy(cleaned_name, fname, MAXPATHLEN);
 743         cleaned_name[MAXPATHLEN - 1] = 0;
 744         clean_fname(cleaned_name);
 745         if (sanitize_paths)
 746                 sanitize_path(cleaned_name, NULL);
 747         fname = cleaned_name;
 748
 749         memset(sum, 0, SUM_LENGTH);
 750
 751         if (readlink_stat(fname, &st, linkbuf) != 0) {
 752                 int save_errno = errno;
 753                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
 754                         /* either symlink pointing nowhere or file that
 755                          * was removed during rsync run; see if excluded
 756                          * before reporting an error */
 757                         if (check_exclude_file(fname, 0, exclude_level)) {
 758                                 /* file is excluded anyway, ignore silently */
 759                                 return NULL;
 760                         }
 761                 }
 762                 io_error |= IOERR_GENERAL;
 763                 rprintf(FERROR, "readlink %s failed: %s\n",
 764                         full_fname(fname), strerror(save_errno));
 765                 return NULL;
 766         }
 767
 768         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 769         if (exclude_level == NO_EXCLUDES)
 770                 goto skip_excludes;
 771
 772         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 773                 rprintf(FINFO, "skipping directory %s\n", fname);
 774                 return NULL;
 775         }
 776
 777         if (one_file_system && st.st_dev != filesystem_dev) {
 778                 if (skip_filesystem(fname, &st))
 779                         return NULL;
 780         }
 781
 782         if (check_exclude_file(fname, S_ISDIR(st.st_mode) != 0, exclude_level))
 783                 return NULL;
 784
 785         if (lp_ignore_nonreadable(module_id) && access(fname, R_OK) != 0)
 786                 return NULL;
 787
 788       skip_excludes:
 789
 790         if (verbose > 2)
 791                 rprintf(FINFO, "make_file(%s,*,%d)\n", fname, exclude_level);
 792
 793         file = new(struct file_struct);
 794         if (!file)
 795                 out_of_memory("make_file");
 796         memset((char *) file, 0, sizeof(*file));
 797
 798         if ((p = strrchr(fname, '/'))) {
 799                 static char *lastdir;
 800                 *p = 0;
 801                 if (lastdir && strcmp(fname, lastdir) == 0)
 802                         file->dirname = lastdir;
 803                 else {
 804                         file->dirname = strdup(fname);
 805                         lastdir = file->dirname;
 806                 }
 807                 file->basename = STRDUP(ap, p + 1);
 808                 *p = '/';
 809         } else {
 810                 file->dirname = NULL;
 811                 file->basename = STRDUP(ap, fname);
 812         }
 813
 814         file->modtime = st.st_mtime;
 815         file->length = st.st_size;
 816         file->mode = st.st_mode;
 817         file->uid = st.st_uid;
 818         file->gid = st.st_gid;
 819         if (preserve_hard_links) {
 820                 if (protocol_version < 28? S_ISREG(st.st_mode)
 821                     : !S_ISDIR(st.st_mode) && st.st_nlink > 1) {
 822                         file->dev = st.st_dev;
 823                         file->inode = st.st_ino;
 824                         file->flags |= HAS_INODE_DATA;
 825                 }
 826         }
 827 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 828         file->rdev = st.st_rdev;
 829 #endif
 830
 831 #if SUPPORT_LINKS
 832         if (S_ISLNK(st.st_mode))
 833                 file->link = STRDUP(ap, linkbuf);
 834 #endif
 835
 836         if (always_checksum && S_ISREG(st.st_mode)) {
 837                 file->sum = (char*)MALLOC(ap, MD4_SUM_LENGTH);
 838                 if (!file->sum)
 839                         out_of_memory("md4 sum");
 840                 file_checksum(fname, file->sum, st.st_size);
 841         }
 842
 843         if (flist_dir) {
 844                 static char *lastdir;
 845                 if (lastdir && strcmp(lastdir, flist_dir) == 0)
 846                         file->basedir = lastdir;
 847                 else {
 848                         file->basedir = strdup(flist_dir);
 849                         lastdir = file->basedir;
 850                 }
 851         } else
 852                 file->basedir = NULL;
 853
 854         if (!S_ISDIR(st.st_mode))
 855                 stats.total_size += st.st_size;
 856
 857         return file;
 858 }
 859
 860
 861 void send_file_name(int f, struct file_list *flist, char *fname,
 862                     int recursive, unsigned short base_flags)
 863 {
 864         struct file_struct *file;
 865         char fbuf[MAXPATHLEN];
 866         extern int delete_excluded;
 867
 868         /* f is set to -1 when calculating deletion file list */
 869         file = make_file(fname, &flist->string_area,
 870                          f == -1 && delete_excluded? SERVER_EXCLUDES
 871                                                    : ALL_EXCLUDES);
 872
 873         if (!file)
 874                 return;
 875
 876         maybe_emit_filelist_progress(flist);
 877
 878         flist_expand(flist);
 879
 880         if (write_batch)
 881                 file->flags |= FLAG_DELETE;
 882
 883         if (file->basename[0]) {
 884                 flist->files[flist->count++] = file;
 885                 send_file_entry(file, f, base_flags);
 886         }
 887
 888         if (S_ISDIR(file->mode) && recursive) {
 889                 struct exclude_struct **last_exclude_list =
 890                     local_exclude_list;
 891                 send_directory(f, flist, f_name_to(file, fbuf, sizeof fbuf));
 892                 local_exclude_list = last_exclude_list;
 893                 return;
 894         }
 895 }
 896
 897
 898 static void send_directory(int f, struct file_list *flist, char *dir)
 899 {
 900         DIR *d;
 901         struct dirent *di;
 902         char fname[MAXPATHLEN];
 903         int l;
 904         char *p;
 905
 906         d = opendir(dir);
 907         if (!d) {
 908                 io_error |= IOERR_GENERAL;
 909                 rprintf(FERROR, "opendir %s failed: %s\n",
 910                         full_fname(dir), strerror(errno));
 911                 return;
 912         }
 913
 914         strlcpy(fname, dir, MAXPATHLEN);
 915         l = strlen(fname);
 916         if (fname[l - 1] != '/') {
 917                 if (l == MAXPATHLEN - 1) {
 918                         io_error |= IOERR_GENERAL;
 919                         rprintf(FERROR, "skipping long-named directory: %s\n",
 920                                 full_fname(fname));
 921                         closedir(d);
 922                         return;
 923                 }
 924                 strlcat(fname, "/", MAXPATHLEN);
 925                 l++;
 926         }
 927         p = fname + strlen(fname);
 928
 929         local_exclude_list = NULL;
 930
 931         if (cvs_exclude) {
 932                 if (strlen(fname) + strlen(".cvsignore") <= MAXPATHLEN - 1) {
 933                         strcpy(p, ".cvsignore");
 934                         add_exclude_file(&exclude_list,fname,MISSING_OK,ADD_EXCLUDE);
 935                 } else {
 936                         io_error |= IOERR_GENERAL;
 937                         rprintf(FINFO,
 938                                 "cannot cvs-exclude in long-named directory %s\n",
 939                                 full_fname(fname));
 940                 }
 941         }
 942
 943         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 944                 char *dname = d_name(di);
 945                 if (dname[0] == '.' && (dname[1] == '\0'
 946                     || (dname[1] == '.' && dname[2] == '\0')))
 947                         continue;
 948                 strlcpy(p, dname, MAXPATHLEN - l);
 949                 send_file_name(f, flist, fname, recurse, 0);
 950         }
 951         if (errno) {
 952                 io_error |= IOERR_GENERAL;
 953                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
 954                     dir, errno, strerror(errno));
 955         }
 956
 957         if (local_exclude_list)
 958                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
 959
 960         closedir(d);
 961 }
 962
 963
 964 /**
 965  * The delete_files() function in receiver.c sets f to -1 so that we just
 966  * construct the file list in memory without sending it over the wire.  It
 967  * also has the side-effect of ignoring user-excludes if delete_excluded
 968  * is set (so that the delete list includes user-excluded files).
 969  **/
 970 struct file_list *send_file_list(int f, int argc, char *argv[])
 971 {
 972         int l;
 973         STRUCT_STAT st;
 974         char *p, *dir, *olddir;
 975         char lastpath[MAXPATHLEN] = "";
 976         struct file_list *flist;
 977         int64 start_write;
 978         int use_ff_fd = 0;
 979
 980         if (show_filelist_p() && f != -1)
 981                 start_filelist_progress("building file list");
 982
 983         start_write = stats.total_written;
 984
 985         flist = flist_new();
 986
 987         if (f != -1) {
 988                 io_start_buffering_out(f);
 989                 if (filesfrom_fd >= 0) {
 990                         if (argv[0] && !push_dir(argv[0], 0)) {
 991                                 rprintf(FERROR, "push_dir %s failed: %s\n",
 992                                         full_fname(argv[0]), strerror(errno));
 993                                 exit_cleanup(RERR_FILESELECT);
 994                         }
 995                         use_ff_fd = 1;
 996                 }
 997         }
 998
 999         while (1) {
1000                 char fname2[MAXPATHLEN];
1001                 char *fname = fname2;
1002
1003                 if (use_ff_fd) {
1004                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1005                                 break;
1006                         sanitize_path(fname, NULL);
1007                 } else {
1008                         if (argc-- == 0)
1009                                 break;
1010                         strlcpy(fname, *argv++, MAXPATHLEN);
1011                         if (sanitize_paths)
1012                                 sanitize_path(fname, NULL);
1013                 }
1014
1015                 l = strlen(fname);
1016                 if (fname[l - 1] == '/') {
1017                         if (l == 2 && fname[0] == '.') {
1018                                 /* Turn "./" into just "." rather than "./." */
1019                                 fname[1] = '\0';
1020                         } else {
1021                                 strlcat(fname, ".", MAXPATHLEN);
1022                         }
1023                 }
1024
1025                 if (link_stat(fname, &st) != 0) {
1026                         if (f != -1) {
1027                                 io_error |= IOERR_GENERAL;
1028                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1029                                         full_fname(fname), strerror(errno));
1030                         }
1031                         continue;
1032                 }
1033
1034                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1035                         rprintf(FINFO, "skipping directory %s\n", fname);
1036                         continue;
1037                 }
1038
1039                 dir = NULL;
1040                 olddir = NULL;
1041
1042                 if (!relative_paths) {
1043                         p = strrchr(fname, '/');
1044                         if (p) {
1045                                 *p = 0;
1046                                 if (p == fname)
1047                                         dir = "/";
1048                                 else
1049                                         dir = fname;
1050                                 fname = p + 1;
1051                         }
1052                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1053                         /* this ensures we send the intermediate directories,
1054                            thus getting their permissions right */
1055                         char *lp = lastpath, *fn = fname, *slash = fname;
1056                         *p = 0;
1057                         /* Skip any initial directories in our path that we
1058                          * have in common with lastpath. */
1059                         while (*fn && *lp == *fn) {
1060                                 if (*fn == '/')
1061                                         slash = fn;
1062                                 lp++, fn++;
1063                         }
1064                         *p = '/';
1065                         if (fn != p || (*lp && *lp != '/')) {
1066                                 int copy_links_saved = copy_links;
1067                                 int recurse_saved = recurse;
1068                                 copy_links = copy_unsafe_links;
1069                                 /* set recurse to 1 to prevent make_file
1070                                  * from ignoring directory, but still
1071                                  * turn off the recursive parameter to
1072                                  * send_file_name */
1073                                 recurse = 1;
1074                                 while ((slash = strchr(slash+1, '/')) != 0) {
1075                                         *slash = 0;
1076                                         send_file_name(f, flist, fname, 0, 0);
1077                                         *slash = '/';
1078                                 }
1079                                 copy_links = copy_links_saved;
1080                                 recurse = recurse_saved;
1081                                 *p = 0;
1082                                 strlcpy(lastpath, fname, sizeof lastpath);
1083                                 *p = '/';
1084                         }
1085                 }
1086
1087                 if (!*fname)
1088                         fname = ".";
1089
1090                 if (dir && *dir) {
1091                         olddir = push_dir(dir, 1);
1092
1093                         if (!olddir) {
1094                                 io_error |= IOERR_GENERAL;
1095                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1096                                         full_fname(dir), strerror(errno));
1097                                 continue;
1098                         }
1099
1100                         flist_dir = dir;
1101                 }
1102
1103                 if (one_file_system)
1104                         set_filesystem(fname);
1105
1106                 send_file_name(f, flist, fname, recurse, FLAG_DELETE);
1107
1108                 if (olddir != NULL) {
1109                         flist_dir = NULL;
1110                         if (pop_dir(olddir) != 0) {
1111                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1112                                         full_fname(dir), strerror(errno));
1113                                 exit_cleanup(RERR_FILESELECT);
1114                         }
1115                 }
1116         }
1117
1118         if (f != -1)
1119                 send_file_entry(NULL, f, 0);
1120
1121         if (show_filelist_p() && f != -1)
1122                 finish_filelist_progress(flist);
1123
1124         clean_flist(flist, 0, 0);
1125
1126         /* now send the uid/gid list. This was introduced in protocol
1127            version 15 */
1128         if (f != -1)
1129                 send_uid_list(f);
1130
1131         /* send the io_error flag */
1132         if (f != -1) {
1133                 extern int module_id;
1134                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1135         }
1136
1137         if (f != -1) {
1138                 io_end_buffering();
1139                 stats.flist_size = stats.total_written - start_write;
1140                 stats.num_files = flist->count;
1141                 if (write_batch)
1142                         write_batch_flist_info(flist->count, flist->files);
1143         }
1144
1145         if (verbose > 2)
1146                 rprintf(FINFO, "send_file_list done\n");
1147
1148         return flist;
1149 }
1150
1151
1152 struct file_list *recv_file_list(int f)
1153 {
1154         struct file_list *flist;
1155         unsigned short flags;
1156         int64 start_read;
1157         extern int list_only;
1158
1159         if (show_filelist_p())
1160                 start_filelist_progress("receiving file list");
1161
1162         start_read = stats.total_read;
1163
1164         flist = new(struct file_list);
1165         if (!flist)
1166                 goto oom;
1167
1168         flist->count = 0;
1169         flist->malloced = 1000;
1170         flist->files = new_array(struct file_struct *, flist->malloced);
1171         if (!flist->files)
1172                 goto oom;
1173
1174
1175         while ((flags = read_byte(f)) != 0) {
1176                 int i = flist->count;
1177
1178                 flist_expand(flist);
1179
1180                 if (protocol_version >= 28 && (flags & EXTENDED_FLAGS))
1181                         flags |= read_byte(f) << 8;
1182                 receive_file_entry(&flist->files[i], flags, f);
1183
1184                 if (S_ISREG(flist->files[i]->mode))
1185                         stats.total_size += flist->files[i]->length;
1186
1187                 flist->count++;
1188
1189                 maybe_emit_filelist_progress(flist);
1190
1191                 if (verbose > 2) {
1192                         rprintf(FINFO, "recv_file_name(%s)\n",
1193                                 f_name(flist->files[i]));
1194                 }
1195         }
1196         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1197
1198         if (verbose > 2)
1199                 rprintf(FINFO, "received %d names\n", flist->count);
1200
1201         clean_flist(flist, relative_paths, 1);
1202
1203         if (show_filelist_p())
1204                 finish_filelist_progress(flist);
1205
1206         /* now recv the uid/gid list. This was introduced in protocol version 15 */
1207         if (f != -1)
1208                 recv_uid_list(f, flist);
1209
1210         /* recv the io_error flag */
1211         if (f != -1 && !read_batch) {   /* dw-added readbatch */
1212                 extern int module_id;
1213                 extern int ignore_errors;
1214                 if (lp_ignore_errors(module_id) || ignore_errors)
1215                         read_int(f);
1216                 else
1217                         io_error |= read_int(f);
1218         }
1219
1220         if (list_only) {
1221                 int i;
1222                 for (i = 0; i < flist->count; i++)
1223                         list_file_entry(flist->files[i]);
1224         }
1225
1226
1227         if (verbose > 2)
1228                 rprintf(FINFO, "recv_file_list done\n");
1229
1230         stats.flist_size = stats.total_read - start_read;
1231         stats.num_files = flist->count;
1232
1233         return flist;
1234
1235       oom:
1236         out_of_memory("recv_file_list");
1237         return NULL;            /* not reached */
1238 }
1239
1240
1241 int file_compare(struct file_struct **file1, struct file_struct **file2)
1242 {
1243         struct file_struct *f1 = *file1;
1244         struct file_struct *f2 = *file2;
1245
1246         if (!f1->basename && !f2->basename)
1247                 return 0;
1248         if (!f1->basename)
1249                 return -1;
1250         if (!f2->basename)
1251                 return 1;
1252         if (f1->dirname == f2->dirname)
1253                 return u_strcmp(f1->basename, f2->basename);
1254         return f_name_cmp(f1, f2);
1255 }
1256
1257
1258 int flist_find(struct file_list *flist, struct file_struct *f)
1259 {
1260         int low = 0, high = flist->count - 1;
1261
1262         while (high >= 0 && !flist->files[high]->basename) high--;
1263
1264         if (high < 0)
1265                 return -1;
1266
1267         while (low != high) {
1268                 int mid = (low + high) / 2;
1269                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1270                 if (ret == 0)
1271                         return flist_up(flist, mid);
1272                 if (ret > 0)
1273                         high = mid;
1274                 else
1275                         low = mid + 1;
1276         }
1277
1278         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1279                 return flist_up(flist, low);
1280         return -1;
1281 }
1282
1283
1284 /*
1285  * free up one file
1286  */
1287 void free_file(struct file_struct *file)
1288 {
1289         if (!file)
1290                 return;
1291         if (file->basename)
1292                 free(file->basename);
1293         if (file->link)
1294                 free(file->link);
1295         if (file->sum)
1296                 free(file->sum);
1297         *file = null_file;
1298 }
1299
1300
1301 /*
1302  * allocate a new file list
1303  */
1304 struct file_list *flist_new(void)
1305 {
1306         struct file_list *flist;
1307
1308         flist = new(struct file_list);
1309         if (!flist)
1310                 out_of_memory("send_file_list");
1311
1312         flist->count = 0;
1313         flist->malloced = 0;
1314         flist->files = NULL;
1315
1316 #if ARENA_SIZE > 0
1317         flist->string_area = string_area_new(0);
1318 #else
1319         flist->string_area = NULL;
1320 #endif
1321         return flist;
1322 }
1323
1324 /*
1325  * free up all elements in a flist
1326  */
1327 void flist_free(struct file_list *flist)
1328 {
1329         int i;
1330         for (i = 1; i < flist->count; i++) {
1331                 if (!flist->string_area)
1332                         free_file(flist->files[i]);
1333                 free(flist->files[i]);
1334         }
1335         /* FIXME: I don't think we generally need to blank the flist
1336          * since it's about to be freed.  This will just cause more
1337          * memory traffic.  If you want a freed-memory debugger, you
1338          * know where to get it. */
1339         memset((char *) flist->files, 0,
1340                sizeof(flist->files[0]) * flist->count);
1341         free(flist->files);
1342         if (flist->string_area)
1343                 string_area_free(flist->string_area);
1344         memset((char *) flist, 0, sizeof(*flist));
1345         free(flist);
1346 }
1347
1348
1349 /*
1350  * This routine ensures we don't have any duplicate names in our file list.
1351  * duplicate names can cause corruption because of the pipelining
1352  */
1353 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1354 {
1355         int i, prev_i = 0;
1356
1357         if (!flist || flist->count == 0)
1358                 return;
1359
1360         qsort(flist->files, flist->count,
1361               sizeof(flist->files[0]), (int (*)()) file_compare);
1362
1363         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1364                 if (flist->files[i]->basename) {
1365                         prev_i = i;
1366                         break;
1367                 }
1368         }
1369         while (++i < flist->count) {
1370                 if (!flist->files[i]->basename)
1371                         continue;
1372                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1373                         if (verbose > 1 && !am_server) {
1374                                 rprintf(FINFO,
1375                                         "removing duplicate name %s from file list %d\n",
1376                                         f_name(flist->files[i]), i);
1377                         }
1378                         /* Make sure that if we unduplicate '.', that we don't
1379                          * lose track of a user-specified starting point (or
1380                          * else deletions will mysteriously fail with -R). */
1381                         if (flist->files[i]->flags & FLAG_DELETE)
1382                                 flist->files[prev_i]->flags |= FLAG_DELETE;
1383                         /* it's not great that the flist knows the semantics of
1384                          * the file memory usage, but i'd rather not add a flag
1385                          * byte to that struct.
1386                          * XXX can i use a bit in the flags field? */
1387                         if (flist->string_area)
1388                                 flist->files[i][0] = null_file;
1389                         else
1390                                 free_file(flist->files[i]);
1391                 }
1392                 else
1393                         prev_i = i;
1394         }
1395
1396         if (strip_root) {
1397                 /* we need to strip off the root directory in the case
1398                    of relative paths, but this must be done _after_
1399                    the sorting phase */
1400                 for (i = 0; i < flist->count; i++) {
1401                         if (flist->files[i]->dirname &&
1402                             flist->files[i]->dirname[0] == '/') {
1403                                 memmove(&flist->files[i]->dirname[0],
1404                                         &flist->files[i]->dirname[1],
1405                                         strlen(flist->files[i]->dirname));
1406                         }
1407
1408                         if (flist->files[i]->dirname &&
1409                             !flist->files[i]->dirname[0]) {
1410                                 flist->files[i]->dirname = NULL;
1411                         }
1412                 }
1413         }
1414
1415         if (verbose <= 3)
1416                 return;
1417
1418         for (i = 0; i < flist->count; i++) {
1419                 rprintf(FINFO, "[%ld] i=%d %s %s mode=0%o len=%.0f\n",
1420                         (long) getpid(), i,
1421                         NS(flist->files[i]->dirname),
1422                         NS(flist->files[i]->basename),
1423                         (int) flist->files[i]->mode,
1424                         (double) flist->files[i]->length);
1425         }
1426 }
1427
1428
1429 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1430
1431 /* Compare the names of two file_struct entities, just like strcmp()
1432  * would do if it were operating on the joined strings.  We assume
1433  * that there are no 0-length strings.
1434  */
1435 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1436 {
1437         int dif;
1438         const uchar *c1, *c2;
1439         enum fnc_state state1, state2;
1440
1441         if (!f1 || !f1->basename) {
1442                 if (!f2 || !f2->basename)
1443                         return 0;
1444                 return -1;
1445         }
1446         if (!f2 || !f2->basename)
1447                 return 1;
1448
1449         if (!(c1 = (uchar*)f1->dirname)) {
1450                 state1 = fnc_BASE;
1451                 c1 = (uchar*)f1->basename;
1452         }
1453         else
1454                 state1 = fnc_DIR;
1455         if (!(c2 = (uchar*)f2->dirname)) {
1456                 state2 = fnc_BASE;
1457                 c2 = (uchar*)f2->basename;
1458         }
1459         else
1460                 state2 = fnc_DIR;
1461
1462         while (1) {
1463                 if ((dif = (int)*c1 - (int)*c2) != 0)
1464                         break;
1465                 if (!*++c1) {
1466                         switch (state1) {
1467                         case fnc_DIR:
1468                                 state1 = fnc_SLASH;
1469                                 c1 = (uchar*)"/";
1470                                 break;
1471                         case fnc_SLASH:
1472                                 state1 = fnc_BASE;
1473                                 c1 = (uchar*)f1->basename;
1474                                 break;
1475                         case fnc_BASE:
1476                                 break;
1477                         }
1478                 }
1479                 if (!*++c2) {
1480                         switch (state2) {
1481                         case fnc_DIR:
1482                                 state2 = fnc_SLASH;
1483                                 c2 = (uchar*)"/";
1484                                 break;
1485                         case fnc_SLASH:
1486                                 state2 = fnc_BASE;
1487                                 c2 = (uchar*)f2->basename;
1488                                 break;
1489                         case fnc_BASE:
1490                                 if (!*c1)
1491                                         return 0;
1492                                 break;
1493                         }
1494                 }
1495         }
1496
1497         return dif;
1498 }
1499
1500
1501 /* Return a copy of the full filename of a flist entry, using the indicated
1502  * buffer.
1503  */
1504 char *f_name_to(struct file_struct *f, char *fbuf, int bsize)
1505 {
1506         if (!f || !f->basename)
1507                 return NULL;
1508
1509         if (f->dirname) {
1510                 int off = strlcpy(fbuf, f->dirname, bsize);
1511                 off += strlcpy(fbuf + off, "/", bsize - off);
1512                 strlcpy(fbuf + off, f->basename, bsize - off);
1513         } else
1514                 strlcpy(fbuf, f->basename, bsize);
1515         return fbuf;
1516 }
1517
1518
1519 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1520  */
1521 char *f_name(struct file_struct *f)
1522 {
1523         static char names[5][MAXPATHLEN];
1524         static unsigned int n;
1525
1526         n = (n + 1) % (sizeof names / sizeof names[0]);
1527
1528         return f_name_to(f, names[n], sizeof names[0]);
1529 }