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->u.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)) {
 392                                 if (file->u.rdev == rdev) {
 393                                         /* Set both flags so that the test when
 394                                          * writing the data is simpler. */
 395                                         flags |= SAME_RDEV_pre28|SAME_HIGH_RDEV;
 396                                 } else
 397                                         rdev = file->u.rdev;
 398                         } else
 399                                 rdev = 0;
 400                 } else if (IS_DEVICE(mode)) {
 401                         if ((file->u.rdev & ~0xFF) == rdev)
 402                                 flags |= SAME_HIGH_RDEV;
 403                         else
 404                                 rdev = file->u.rdev & ~0xFF;
 405                 }
 406         }
 407         if (file->uid == uid)
 408                 flags |= SAME_UID;
 409         else
 410                 uid = file->uid;
 411         if (file->gid == gid)
 412                 flags |= SAME_GID;
 413         else
 414                 gid = file->gid;
 415         if (file->modtime == modtime)
 416                 flags |= SAME_TIME;
 417         else
 418                 modtime = file->modtime;
 419         if (file->link_u.idev) {
 420                 if (file->F_DEV == dev) {
 421                         if (protocol_version >= 28)
 422                                 flags |= SAME_DEV;
 423                 } else
 424                         dev = file->F_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->u.rdev);
 480                 else if (protocol_version >= 28)
 481                         write_byte(f, file->u.rdev);
 482         }
 483
 484 #if SUPPORT_LINKS
 485         if (preserve_links && S_ISLNK(mode)) {
 486                 write_int(f, strlen(file->u.link));
 487                 write_buf(f, file->u.link, strlen(file->u.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->F_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->F_INODE);
 502                 }
 503         }
 504 #endif
 505
 506         if (always_checksum) {
 507                 char *sum;
 508                 if (S_ISREG(mode))
 509                         sum = file->u.sum;
 510                 else if (protocol_version < 28) {
 511                         /* Prior to 28, we sent a useless set of nulls. */
 512                         sum = empty_sum;
 513                 } else
 514                         sum = NULL;
 515                 if (sum) {
 516                         write_buf(f, sum, protocol_version < 21? 2
 517                                                         : MD4_SUM_LENGTH);
 518                 }
 519         }
 520
 521         strlcpy(lastname, fname, MAXPATHLEN);
 522         lastname[MAXPATHLEN - 1] = 0;
 523
 524         io_write_phase = "unknown";
 525 }
 526
 527
 528
 529 void receive_file_entry(struct file_struct **fptr, unsigned short flags, int f)
 530 {
 531         static time_t modtime;
 532         static mode_t mode;
 533         static DEV64_T rdev;    /* just high bytes in p28 onward */
 534         static DEV64_T dev;
 535         static uid_t uid;
 536         static gid_t gid;
 537         static char lastname[MAXPATHLEN];
 538         char thisname[MAXPATHLEN];
 539         unsigned int l1 = 0, l2 = 0;
 540         char *p;
 541         struct file_struct *file;
 542
 543         if (!fptr) {
 544                 modtime = 0, mode = 0;
 545                 rdev = 0, dev = 0;
 546                 uid = 0, gid = 0;
 547                 *lastname = '\0';
 548                 return;
 549         }
 550
 551         if (flags & SAME_NAME)
 552                 l1 = read_byte(f);
 553
 554         if (flags & LONG_NAME)
 555                 l2 = read_int(f);
 556         else
 557                 l2 = read_byte(f);
 558
 559         file = new(struct file_struct);
 560         if (!file)
 561                 out_of_memory("receive_file_entry");
 562         memset((char *) file, 0, sizeof(*file));
 563         (*fptr) = file;
 564
 565         if (l2 >= MAXPATHLEN - l1) {
 566                 rprintf(FERROR,
 567                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 568                         flags, l1, l2, lastname);
 569                 overflow("receive_file_entry");
 570         }
 571
 572         strlcpy(thisname, lastname, l1 + 1);
 573         read_sbuf(f, &thisname[l1], l2);
 574         thisname[l1 + l2] = 0;
 575
 576         strlcpy(lastname, thisname, MAXPATHLEN);
 577         lastname[MAXPATHLEN - 1] = 0;
 578
 579         clean_fname(thisname);
 580
 581         if (sanitize_paths) {
 582                 sanitize_path(thisname, NULL);
 583         }
 584
 585         if ((p = strrchr(thisname, '/'))) {
 586                 static char *lastdir;
 587                 *p = 0;
 588                 if (lastdir && strcmp(thisname, lastdir) == 0)
 589                         file->dirname = lastdir;
 590                 else {
 591                         file->dirname = strdup(thisname);
 592                         lastdir = file->dirname;
 593                 }
 594                 file->basename = strdup(p + 1);
 595         } else {
 596                 file->dirname = NULL;
 597                 file->basename = strdup(thisname);
 598         }
 599
 600         if (!file->basename)
 601                 out_of_memory("receive_file_entry 1");
 602
 603         file->flags = flags;
 604         file->length = read_longint(f);
 605         if (!(flags & SAME_TIME))
 606                 modtime = (time_t)read_int(f);
 607         file->modtime = modtime;
 608         if (!(flags & SAME_MODE))
 609                 mode = from_wire_mode(read_int(f));
 610         file->mode = mode;
 611
 612         if (preserve_uid) {
 613                 if (!(flags & SAME_UID))
 614                         uid = (uid_t)read_int(f);
 615                 file->uid = uid;
 616         }
 617         if (preserve_gid) {
 618                 if (!(flags & SAME_GID))
 619                         gid = (gid_t)read_int(f);
 620                 file->gid = gid;
 621         }
 622         if (preserve_devices) {
 623                 if (protocol_version < 28) {
 624                         if (IS_DEVICE(mode)) {
 625                                 if (!(flags & SAME_RDEV_pre28))
 626                                         rdev = (DEV64_T)read_int(f);
 627                                 file->u.rdev = rdev;
 628                         } else
 629                                 rdev = 0;
 630                 } else if (IS_DEVICE(mode)) {
 631                         if (!(flags & SAME_HIGH_RDEV)) {
 632                                 file->u.rdev = (DEV64_T)read_int(f);
 633                                 rdev = file->u.rdev & ~0xFF;
 634                         } else
 635                                 file->u.rdev = rdev | (DEV64_T)read_byte(f);
 636                 }
 637         }
 638
 639         if (preserve_links && S_ISLNK(mode)) {
 640                 int l = read_int(f);
 641                 if (l < 0) {
 642                         rprintf(FERROR, "overflow: l=%d\n", l);
 643                         overflow("receive_file_entry");
 644                 }
 645                 if (!(file->u.link = new_array(char, l + 1)))
 646                         out_of_memory("receive_file_entry 2");
 647                 read_sbuf(f, file->u.link, l);
 648                 if (sanitize_paths)
 649                         sanitize_path(file->u.link, file->dirname);
 650         }
 651 #if SUPPORT_HARD_LINKS
 652         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 653                 flags |= HAS_INODE_DATA;
 654         if (flags & HAS_INODE_DATA) {
 655                 if (!(file->link_u.idev = new(struct idev)))
 656                         out_of_memory("file inode data");
 657                 if (protocol_version < 26) {
 658                         dev = read_int(f);
 659                         file->F_INODE = read_int(f);
 660                 } else {
 661                         if (!(flags & SAME_DEV))
 662                                 dev = read_longint(f);
 663                         file->F_INODE = read_longint(f);
 664                 }
 665                 file->F_DEV = dev;
 666         }
 667 #endif
 668
 669         if (always_checksum) {
 670                 char *sum;
 671                 if (S_ISREG(mode)) {
 672                         sum = file->u.sum = new_array(char, MD4_SUM_LENGTH);
 673                         if (!sum)
 674                                 out_of_memory("md4 sum");
 675                 } else if (protocol_version < 28) {
 676                         /* Prior to 28, we get a useless set of nulls. */
 677                         sum = empty_sum;
 678                 } else
 679                         sum = NULL;
 680                 if (sum) {
 681                         read_buf(f, sum, protocol_version < 21? 2
 682                                                 : MD4_SUM_LENGTH);
 683                 }
 684         }
 685
 686         if (!preserve_perms) {
 687                 extern int orig_umask;
 688                 /* set an appropriate set of permissions based on original
 689                  * permissions and umask. This emulates what GNU cp does */
 690                 file->mode &= ~orig_umask;
 691         }
 692 }
 693
 694
 695 /* determine if a file in a different filesstem should be skipped
 696    when one_file_system is set. We bascally only want to include
 697    the mount points - but they can be hard to find! */
 698 static int skip_filesystem(char *fname, STRUCT_STAT * st)
 699 {
 700         STRUCT_STAT st2;
 701         char *p = strrchr(fname, '/');
 702
 703         /* skip all but directories */
 704         if (!S_ISDIR(st->st_mode))
 705                 return 1;
 706
 707         /* if its not a subdirectory then allow */
 708         if (!p)
 709                 return 0;
 710
 711         *p = 0;
 712         if (link_stat(fname, &st2)) {
 713                 *p = '/';
 714                 return 0;
 715         }
 716         *p = '/';
 717
 718         return (st2.st_dev != filesystem_dev);
 719 }
 720
 721 #define STRDUP(ap, p)   (ap ? string_area_strdup(ap, p) : strdup(p))
 722 /* IRIX cc cares that the operands to the ternary have the same type. */
 723 #define MALLOC(ap, i)   (ap ? (void*) string_area_malloc(ap, i) : malloc(i))
 724
 725 /**
 726  * Create a file_struct for a named file by reading its stat()
 727  * information and performing extensive checks against global
 728  * options.
 729  *
 730  * @return the new file, or NULL if there was an error or this file
 731  * should be excluded.
 732  *
 733  * @todo There is a small optimization opportunity here to avoid
 734  * stat()ing the file in some circumstances, which has a certain cost.
 735  * We are called immediately after doing readdir(), and so we may
 736  * already know the d_type of the file.  We could for example avoid
 737  * statting directories if we're not recursing, but this is not a very
 738  * important case.  Some systems may not have d_type.
 739  **/
 740 struct file_struct *make_file(char *fname, struct string_area **ap,
 741                               int exclude_level)
 742 {
 743         struct file_struct *file;
 744         STRUCT_STAT st;
 745         char sum[SUM_LENGTH];
 746         char *p;
 747         char cleaned_name[MAXPATHLEN];
 748         char linkbuf[MAXPATHLEN];
 749         extern int module_id;
 750
 751         strlcpy(cleaned_name, fname, MAXPATHLEN);
 752         cleaned_name[MAXPATHLEN - 1] = 0;
 753         clean_fname(cleaned_name);
 754         if (sanitize_paths)
 755                 sanitize_path(cleaned_name, NULL);
 756         fname = cleaned_name;
 757
 758         memset(sum, 0, SUM_LENGTH);
 759
 760         if (readlink_stat(fname, &st, linkbuf) != 0) {
 761                 int save_errno = errno;
 762                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
 763                         /* either symlink pointing nowhere or file that
 764                          * was removed during rsync run; see if excluded
 765                          * before reporting an error */
 766                         if (check_exclude_file(fname, 0, exclude_level)) {
 767                                 /* file is excluded anyway, ignore silently */
 768                                 return NULL;
 769                         }
 770                 }
 771                 io_error |= IOERR_GENERAL;
 772                 rprintf(FERROR, "readlink %s failed: %s\n",
 773                         full_fname(fname), strerror(save_errno));
 774                 return NULL;
 775         }
 776
 777         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 778         if (exclude_level == NO_EXCLUDES)
 779                 goto skip_excludes;
 780
 781         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 782                 rprintf(FINFO, "skipping directory %s\n", fname);
 783                 return NULL;
 784         }
 785
 786         if (one_file_system && st.st_dev != filesystem_dev) {
 787                 if (skip_filesystem(fname, &st))
 788                         return NULL;
 789         }
 790
 791         if (check_exclude_file(fname, S_ISDIR(st.st_mode) != 0, exclude_level))
 792                 return NULL;
 793
 794         if (lp_ignore_nonreadable(module_id) && access(fname, R_OK) != 0)
 795                 return NULL;
 796
 797       skip_excludes:
 798
 799         if (verbose > 2)
 800                 rprintf(FINFO, "make_file(%s,*,%d)\n", fname, exclude_level);
 801
 802         file = new(struct file_struct);
 803         if (!file)
 804                 out_of_memory("make_file");
 805         memset((char *) file, 0, sizeof(*file));
 806
 807         if ((p = strrchr(fname, '/'))) {
 808                 static char *lastdir;
 809                 *p = 0;
 810                 if (lastdir && strcmp(fname, lastdir) == 0)
 811                         file->dirname = lastdir;
 812                 else {
 813                         file->dirname = strdup(fname);
 814                         lastdir = file->dirname;
 815                 }
 816                 file->basename = STRDUP(ap, p + 1);
 817                 *p = '/';
 818         } else {
 819                 file->dirname = NULL;
 820                 file->basename = STRDUP(ap, fname);
 821         }
 822
 823         file->modtime = st.st_mtime;
 824         file->length = st.st_size;
 825         file->mode = st.st_mode;
 826         file->uid = st.st_uid;
 827         file->gid = st.st_gid;
 828         if (preserve_hard_links) {
 829                 if (protocol_version < 28 ? S_ISREG(st.st_mode)
 830                     : !S_ISDIR(st.st_mode) && st.st_nlink > 1) {
 831                         if (!(file->link_u.idev = new(struct idev)))
 832                                 out_of_memory("file inode data");
 833                         file->F_DEV = st.st_dev;
 834                         file->F_INODE = st.st_ino;
 835                 }
 836         }
 837 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 838         if (IS_DEVICE(st.st_mode))
 839                 file->u.rdev = st.st_rdev;
 840 #endif
 841
 842 #if SUPPORT_LINKS
 843         if (S_ISLNK(st.st_mode))
 844                 file->u.link = STRDUP(ap, linkbuf);
 845 #endif
 846
 847         if (always_checksum && S_ISREG(st.st_mode)) {
 848                 if (!(file->u.sum = (char*)MALLOC(ap, MD4_SUM_LENGTH)))
 849                         out_of_memory("md4 sum");
 850                 file_checksum(fname, file->u.sum, st.st_size);
 851         }
 852
 853         if (flist_dir) {
 854                 static char *lastdir;
 855                 if (lastdir && strcmp(lastdir, flist_dir) == 0)
 856                         file->basedir = lastdir;
 857                 else {
 858                         file->basedir = strdup(flist_dir);
 859                         lastdir = file->basedir;
 860                 }
 861         } else
 862                 file->basedir = NULL;
 863
 864         if (!S_ISDIR(st.st_mode))
 865                 stats.total_size += st.st_size;
 866
 867         return file;
 868 }
 869
 870
 871 void send_file_name(int f, struct file_list *flist, char *fname,
 872                     int recursive, unsigned short base_flags)
 873 {
 874         struct file_struct *file;
 875         char fbuf[MAXPATHLEN];
 876         extern int delete_excluded;
 877
 878         /* f is set to -1 when calculating deletion file list */
 879         file = make_file(fname, &flist->string_area,
 880                          f == -1 && delete_excluded? SERVER_EXCLUDES
 881                                                    : ALL_EXCLUDES);
 882
 883         if (!file)
 884                 return;
 885
 886         maybe_emit_filelist_progress(flist);
 887
 888         flist_expand(flist);
 889
 890         if (write_batch)
 891                 file->flags |= FLAG_DELETE;
 892
 893         if (file->basename[0]) {
 894                 flist->files[flist->count++] = file;
 895                 send_file_entry(file, f, base_flags);
 896         }
 897
 898         if (S_ISDIR(file->mode) && recursive) {
 899                 struct exclude_struct **last_exclude_list =
 900                     local_exclude_list;
 901                 send_directory(f, flist, f_name_to(file, fbuf, sizeof fbuf));
 902                 local_exclude_list = last_exclude_list;
 903                 return;
 904         }
 905 }
 906
 907
 908 static void send_directory(int f, struct file_list *flist, char *dir)
 909 {
 910         DIR *d;
 911         struct dirent *di;
 912         char fname[MAXPATHLEN];
 913         int l;
 914         char *p;
 915
 916         d = opendir(dir);
 917         if (!d) {
 918                 io_error |= IOERR_GENERAL;
 919                 rprintf(FERROR, "opendir %s failed: %s\n",
 920                         full_fname(dir), strerror(errno));
 921                 return;
 922         }
 923
 924         strlcpy(fname, dir, MAXPATHLEN);
 925         l = strlen(fname);
 926         if (fname[l - 1] != '/') {
 927                 if (l == MAXPATHLEN - 1) {
 928                         io_error |= IOERR_GENERAL;
 929                         rprintf(FERROR, "skipping long-named directory: %s\n",
 930                                 full_fname(fname));
 931                         closedir(d);
 932                         return;
 933                 }
 934                 strlcat(fname, "/", MAXPATHLEN);
 935                 l++;
 936         }
 937         p = fname + strlen(fname);
 938
 939         local_exclude_list = NULL;
 940
 941         if (cvs_exclude) {
 942                 if (strlen(fname) + strlen(".cvsignore") <= MAXPATHLEN - 1) {
 943                         strcpy(p, ".cvsignore");
 944                         add_exclude_file(&exclude_list,fname,MISSING_OK,ADD_EXCLUDE);
 945                 } else {
 946                         io_error |= IOERR_GENERAL;
 947                         rprintf(FINFO,
 948                                 "cannot cvs-exclude in long-named directory %s\n",
 949                                 full_fname(fname));
 950                 }
 951         }
 952
 953         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 954                 char *dname = d_name(di);
 955                 if (dname[0] == '.' && (dname[1] == '\0'
 956                     || (dname[1] == '.' && dname[2] == '\0')))
 957                         continue;
 958                 strlcpy(p, dname, MAXPATHLEN - l);
 959                 send_file_name(f, flist, fname, recurse, 0);
 960         }
 961         if (errno) {
 962                 io_error |= IOERR_GENERAL;
 963                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
 964                     dir, errno, strerror(errno));
 965         }
 966
 967         if (local_exclude_list)
 968                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
 969
 970         closedir(d);
 971 }
 972
 973
 974 /**
 975  * The delete_files() function in receiver.c sets f to -1 so that we just
 976  * construct the file list in memory without sending it over the wire.  It
 977  * also has the side-effect of ignoring user-excludes if delete_excluded
 978  * is set (so that the delete list includes user-excluded files).
 979  **/
 980 struct file_list *send_file_list(int f, int argc, char *argv[])
 981 {
 982         int l;
 983         STRUCT_STAT st;
 984         char *p, *dir, *olddir;
 985         char lastpath[MAXPATHLEN] = "";
 986         struct file_list *flist;
 987         int64 start_write;
 988         int use_ff_fd = 0;
 989
 990         if (show_filelist_p() && f != -1)
 991                 start_filelist_progress("building file list");
 992
 993         start_write = stats.total_written;
 994
 995         flist = flist_new();
 996
 997         if (f != -1) {
 998                 io_start_buffering_out(f);
 999                 if (filesfrom_fd >= 0) {
1000                         if (argv[0] && !push_dir(argv[0], 0)) {
1001                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1002                                         full_fname(argv[0]), strerror(errno));
1003                                 exit_cleanup(RERR_FILESELECT);
1004                         }
1005                         use_ff_fd = 1;
1006                 }
1007         }
1008
1009         while (1) {
1010                 char fname2[MAXPATHLEN];
1011                 char *fname = fname2;
1012
1013                 if (use_ff_fd) {
1014                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1015                                 break;
1016                         sanitize_path(fname, NULL);
1017                 } else {
1018                         if (argc-- == 0)
1019                                 break;
1020                         strlcpy(fname, *argv++, MAXPATHLEN);
1021                         if (sanitize_paths)
1022                                 sanitize_path(fname, NULL);
1023                 }
1024
1025                 l = strlen(fname);
1026                 if (fname[l - 1] == '/') {
1027                         if (l == 2 && fname[0] == '.') {
1028                                 /* Turn "./" into just "." rather than "./." */
1029                                 fname[1] = '\0';
1030                         } else {
1031                                 strlcat(fname, ".", MAXPATHLEN);
1032                         }
1033                 }
1034
1035                 if (link_stat(fname, &st) != 0) {
1036                         if (f != -1) {
1037                                 io_error |= IOERR_GENERAL;
1038                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1039                                         full_fname(fname), strerror(errno));
1040                         }
1041                         continue;
1042                 }
1043
1044                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1045                         rprintf(FINFO, "skipping directory %s\n", fname);
1046                         continue;
1047                 }
1048
1049                 dir = NULL;
1050                 olddir = NULL;
1051
1052                 if (!relative_paths) {
1053                         p = strrchr(fname, '/');
1054                         if (p) {
1055                                 *p = 0;
1056                                 if (p == fname)
1057                                         dir = "/";
1058                                 else
1059                                         dir = fname;
1060                                 fname = p + 1;
1061                         }
1062                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1063                         /* this ensures we send the intermediate directories,
1064                            thus getting their permissions right */
1065                         char *lp = lastpath, *fn = fname, *slash = fname;
1066                         *p = 0;
1067                         /* Skip any initial directories in our path that we
1068                          * have in common with lastpath. */
1069                         while (*fn && *lp == *fn) {
1070                                 if (*fn == '/')
1071                                         slash = fn;
1072                                 lp++, fn++;
1073                         }
1074                         *p = '/';
1075                         if (fn != p || (*lp && *lp != '/')) {
1076                                 int copy_links_saved = copy_links;
1077                                 int recurse_saved = recurse;
1078                                 copy_links = copy_unsafe_links;
1079                                 /* set recurse to 1 to prevent make_file
1080                                  * from ignoring directory, but still
1081                                  * turn off the recursive parameter to
1082                                  * send_file_name */
1083                                 recurse = 1;
1084                                 while ((slash = strchr(slash+1, '/')) != 0) {
1085                                         *slash = 0;
1086                                         send_file_name(f, flist, fname, 0, 0);
1087                                         *slash = '/';
1088                                 }
1089                                 copy_links = copy_links_saved;
1090                                 recurse = recurse_saved;
1091                                 *p = 0;
1092                                 strlcpy(lastpath, fname, sizeof lastpath);
1093                                 *p = '/';
1094                         }
1095                 }
1096
1097                 if (!*fname)
1098                         fname = ".";
1099
1100                 if (dir && *dir) {
1101                         olddir = push_dir(dir, 1);
1102
1103                         if (!olddir) {
1104                                 io_error |= IOERR_GENERAL;
1105                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1106                                         full_fname(dir), strerror(errno));
1107                                 continue;
1108                         }
1109
1110                         flist_dir = dir;
1111                 }
1112
1113                 if (one_file_system)
1114                         set_filesystem(fname);
1115
1116                 send_file_name(f, flist, fname, recurse, FLAG_DELETE);
1117
1118                 if (olddir != NULL) {
1119                         flist_dir = NULL;
1120                         if (pop_dir(olddir) != 0) {
1121                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1122                                         full_fname(dir), strerror(errno));
1123                                 exit_cleanup(RERR_FILESELECT);
1124                         }
1125                 }
1126         }
1127
1128         if (f != -1)
1129                 send_file_entry(NULL, f, 0);
1130
1131         if (show_filelist_p() && f != -1)
1132                 finish_filelist_progress(flist);
1133
1134         clean_flist(flist, 0, 0);
1135
1136         /* now send the uid/gid list. This was introduced in protocol
1137            version 15 */
1138         if (f != -1)
1139                 send_uid_list(f);
1140
1141         /* send the io_error flag */
1142         if (f != -1) {
1143                 extern int module_id;
1144                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1145         }
1146
1147         if (f != -1) {
1148                 io_end_buffering();
1149                 stats.flist_size = stats.total_written - start_write;
1150                 stats.num_files = flist->count;
1151                 if (write_batch)
1152                         write_batch_flist_info(flist->count, flist->files);
1153         }
1154
1155         if (verbose > 2)
1156                 rprintf(FINFO, "send_file_list done\n");
1157
1158         return flist;
1159 }
1160
1161
1162 struct file_list *recv_file_list(int f)
1163 {
1164         struct file_list *flist;
1165         unsigned short flags;
1166         int64 start_read;
1167         extern int list_only;
1168
1169         if (show_filelist_p())
1170                 start_filelist_progress("receiving file list");
1171
1172         start_read = stats.total_read;
1173
1174         flist = new(struct file_list);
1175         if (!flist)
1176                 goto oom;
1177
1178         flist->count = 0;
1179         flist->malloced = 1000;
1180         flist->files = new_array(struct file_struct *, flist->malloced);
1181         if (!flist->files)
1182                 goto oom;
1183
1184
1185         while ((flags = read_byte(f)) != 0) {
1186                 int i = flist->count;
1187
1188                 flist_expand(flist);
1189
1190                 if (protocol_version >= 28 && (flags & EXTENDED_FLAGS))
1191                         flags |= read_byte(f) << 8;
1192                 receive_file_entry(&flist->files[i], flags, f);
1193
1194                 if (S_ISREG(flist->files[i]->mode))
1195                         stats.total_size += flist->files[i]->length;
1196
1197                 flist->count++;
1198
1199                 maybe_emit_filelist_progress(flist);
1200
1201                 if (verbose > 2) {
1202                         rprintf(FINFO, "recv_file_name(%s)\n",
1203                                 f_name(flist->files[i]));
1204                 }
1205         }
1206         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1207
1208         if (verbose > 2)
1209                 rprintf(FINFO, "received %d names\n", flist->count);
1210
1211         clean_flist(flist, relative_paths, 1);
1212
1213         if (show_filelist_p())
1214                 finish_filelist_progress(flist);
1215
1216         /* now recv the uid/gid list. This was introduced in protocol version 15 */
1217         if (f != -1)
1218                 recv_uid_list(f, flist);
1219
1220         /* recv the io_error flag */
1221         if (f != -1 && !read_batch) {   /* dw-added readbatch */
1222                 extern int module_id;
1223                 extern int ignore_errors;
1224                 if (lp_ignore_errors(module_id) || ignore_errors)
1225                         read_int(f);
1226                 else
1227                         io_error |= read_int(f);
1228         }
1229
1230         if (list_only) {
1231                 int i;
1232                 for (i = 0; i < flist->count; i++)
1233                         list_file_entry(flist->files[i]);
1234         }
1235
1236
1237         if (verbose > 2)
1238                 rprintf(FINFO, "recv_file_list done\n");
1239
1240         stats.flist_size = stats.total_read - start_read;
1241         stats.num_files = flist->count;
1242
1243         return flist;
1244
1245       oom:
1246         out_of_memory("recv_file_list");
1247         return NULL;            /* not reached */
1248 }
1249
1250
1251 int file_compare(struct file_struct **file1, struct file_struct **file2)
1252 {
1253         struct file_struct *f1 = *file1;
1254         struct file_struct *f2 = *file2;
1255
1256         if (!f1->basename && !f2->basename)
1257                 return 0;
1258         if (!f1->basename)
1259                 return -1;
1260         if (!f2->basename)
1261                 return 1;
1262         if (f1->dirname == f2->dirname)
1263                 return u_strcmp(f1->basename, f2->basename);
1264         return f_name_cmp(f1, f2);
1265 }
1266
1267
1268 int flist_find(struct file_list *flist, struct file_struct *f)
1269 {
1270         int low = 0, high = flist->count - 1;
1271
1272         while (high >= 0 && !flist->files[high]->basename) high--;
1273
1274         if (high < 0)
1275                 return -1;
1276
1277         while (low != high) {
1278                 int mid = (low + high) / 2;
1279                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1280                 if (ret == 0)
1281                         return flist_up(flist, mid);
1282                 if (ret > 0)
1283                         high = mid;
1284                 else
1285                         low = mid + 1;
1286         }
1287
1288         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1289                 return flist_up(flist, low);
1290         return -1;
1291 }
1292
1293
1294 /*
1295  * free up one file
1296  */
1297 void free_file(struct file_struct *file)
1298 {
1299         if (!file)
1300                 return;
1301         if (file->basename)
1302                 free(file->basename);
1303         if (!IS_DEVICE(file->mode) && file->u.link)
1304                 free(file->u.link); /* Handles u.sum too. */
1305         if (file->link_u.idev)
1306                 free((char*)file->link_u.idev); /* Handles link_u.links too. */
1307         *file = null_file;
1308 }
1309
1310
1311 /*
1312  * allocate a new file list
1313  */
1314 struct file_list *flist_new(void)
1315 {
1316         struct file_list *flist;
1317
1318         flist = new(struct file_list);
1319         if (!flist)
1320                 out_of_memory("send_file_list");
1321
1322         flist->count = 0;
1323         flist->malloced = 0;
1324         flist->files = NULL;
1325
1326 #if ARENA_SIZE > 0
1327         flist->string_area = string_area_new(0);
1328 #else
1329         flist->string_area = NULL;
1330 #endif
1331         return flist;
1332 }
1333
1334 /*
1335  * free up all elements in a flist
1336  */
1337 void flist_free(struct file_list *flist)
1338 {
1339         int i;
1340         for (i = 1; i < flist->count; i++) {
1341                 if (!flist->string_area)
1342                         free_file(flist->files[i]);
1343                 free(flist->files[i]);
1344         }
1345         /* FIXME: I don't think we generally need to blank the flist
1346          * since it's about to be freed.  This will just cause more
1347          * memory traffic.  If you want a freed-memory debugger, you
1348          * know where to get it. */
1349         memset((char *) flist->files, 0,
1350                sizeof(flist->files[0]) * flist->count);
1351         free(flist->files);
1352         if (flist->string_area)
1353                 string_area_free(flist->string_area);
1354         memset((char *) flist, 0, sizeof(*flist));
1355         free(flist);
1356 }
1357
1358
1359 /*
1360  * This routine ensures we don't have any duplicate names in our file list.
1361  * duplicate names can cause corruption because of the pipelining
1362  */
1363 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1364 {
1365         int i, prev_i = 0;
1366
1367         if (!flist || flist->count == 0)
1368                 return;
1369
1370         qsort(flist->files, flist->count,
1371               sizeof(flist->files[0]), (int (*)()) file_compare);
1372
1373         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1374                 if (flist->files[i]->basename) {
1375                         prev_i = i;
1376                         break;
1377                 }
1378         }
1379         while (++i < flist->count) {
1380                 if (!flist->files[i]->basename)
1381                         continue;
1382                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1383                         if (verbose > 1 && !am_server) {
1384                                 rprintf(FINFO,
1385                                         "removing duplicate name %s from file list %d\n",
1386                                         f_name(flist->files[i]), i);
1387                         }
1388                         /* Make sure that if we unduplicate '.', that we don't
1389                          * lose track of a user-specified starting point (or
1390                          * else deletions will mysteriously fail with -R). */
1391                         if (flist->files[i]->flags & FLAG_DELETE)
1392                                 flist->files[prev_i]->flags |= FLAG_DELETE;
1393                         /* it's not great that the flist knows the semantics of
1394                          * the file memory usage, but i'd rather not add a flag
1395                          * byte to that struct.
1396                          * XXX can i use a bit in the flags field? */
1397                         if (flist->string_area)
1398                                 flist->files[i][0] = null_file;
1399                         else
1400                                 free_file(flist->files[i]);
1401                 } else
1402                         prev_i = i;
1403         }
1404
1405         if (strip_root) {
1406                 /* we need to strip off the root directory in the case
1407                    of relative paths, but this must be done _after_
1408                    the sorting phase */
1409                 for (i = 0; i < flist->count; i++) {
1410                         if (flist->files[i]->dirname &&
1411                             flist->files[i]->dirname[0] == '/') {
1412                                 memmove(&flist->files[i]->dirname[0],
1413                                         &flist->files[i]->dirname[1],
1414                                         strlen(flist->files[i]->dirname));
1415                         }
1416
1417                         if (flist->files[i]->dirname &&
1418                             !flist->files[i]->dirname[0]) {
1419                                 flist->files[i]->dirname = NULL;
1420                         }
1421                 }
1422         }
1423
1424         if (verbose <= 3)
1425                 return;
1426
1427         for (i = 0; i < flist->count; i++) {
1428                 rprintf(FINFO, "[%ld] i=%d %s %s mode=0%o len=%.0f\n",
1429                         (long) getpid(), i,
1430                         NS(flist->files[i]->dirname),
1431                         NS(flist->files[i]->basename),
1432                         (int) flist->files[i]->mode,
1433                         (double) flist->files[i]->length);
1434         }
1435 }
1436
1437
1438 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1439
1440 /* Compare the names of two file_struct entities, just like strcmp()
1441  * would do if it were operating on the joined strings.  We assume
1442  * that there are no 0-length strings.
1443  */
1444 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1445 {
1446         int dif;
1447         const uchar *c1, *c2;
1448         enum fnc_state state1, state2;
1449
1450         if (!f1 || !f1->basename) {
1451                 if (!f2 || !f2->basename)
1452                         return 0;
1453                 return -1;
1454         }
1455         if (!f2 || !f2->basename)
1456                 return 1;
1457
1458         if (!(c1 = (uchar*)f1->dirname)) {
1459                 state1 = fnc_BASE;
1460                 c1 = (uchar*)f1->basename;
1461         } else
1462                 state1 = fnc_DIR;
1463         if (!(c2 = (uchar*)f2->dirname)) {
1464                 state2 = fnc_BASE;
1465                 c2 = (uchar*)f2->basename;
1466         } else
1467                 state2 = fnc_DIR;
1468
1469         while (1) {
1470                 if ((dif = (int)*c1 - (int)*c2) != 0)
1471                         break;
1472                 if (!*++c1) {
1473                         switch (state1) {
1474                         case fnc_DIR:
1475                                 state1 = fnc_SLASH;
1476                                 c1 = (uchar*)"/";
1477                                 break;
1478                         case fnc_SLASH:
1479                                 state1 = fnc_BASE;
1480                                 c1 = (uchar*)f1->basename;
1481                                 break;
1482                         case fnc_BASE:
1483                                 break;
1484                         }
1485                 }
1486                 if (!*++c2) {
1487                         switch (state2) {
1488                         case fnc_DIR:
1489                                 state2 = fnc_SLASH;
1490                                 c2 = (uchar*)"/";
1491                                 break;
1492                         case fnc_SLASH:
1493                                 state2 = fnc_BASE;
1494                                 c2 = (uchar*)f2->basename;
1495                                 break;
1496                         case fnc_BASE:
1497                                 if (!*c1)
1498                                         return 0;
1499                                 break;
1500                         }
1501                 }
1502         }
1503
1504         return dif;
1505 }
1506
1507
1508 /* Return a copy of the full filename of a flist entry, using the indicated
1509  * buffer.
1510  */
1511 char *f_name_to(struct file_struct *f, char *fbuf, int bsize)
1512 {
1513         if (!f || !f->basename)
1514                 return NULL;
1515
1516         if (f->dirname) {
1517                 int off = strlcpy(fbuf, f->dirname, bsize);
1518                 off += strlcpy(fbuf + off, "/", bsize - off);
1519                 strlcpy(fbuf + off, f->basename, bsize - off);
1520         } else
1521                 strlcpy(fbuf, f->basename, bsize);
1522         return fbuf;
1523 }
1524
1525
1526 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1527  */
1528 char *f_name(struct file_struct *f)
1529 {
1530         static char names[5][MAXPATHLEN];
1531         static unsigned int n;
1532
1533         n = (n + 1) % (sizeof names / sizeof names[0]);
1534
1535         return f_name_to(f, names[n], sizeof names[0]);
1536 }