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 extern int module_id;
  41 extern int ignore_errors;
  42
  43 extern int cvs_exclude;
  44
  45 extern int recurse;
  46 extern char curr_dir[MAXPATHLEN];
  47 extern char *files_from;
  48 extern int filesfrom_fd;
  49
  50 extern int one_file_system;
  51 extern int make_backups;
  52 extern int preserve_links;
  53 extern int preserve_hard_links;
  54 extern int preserve_perms;
  55 extern int preserve_devices;
  56 extern int preserve_uid;
  57 extern int preserve_gid;
  58 extern int preserve_times;
  59 extern int relative_paths;
  60 extern int implied_dirs;
  61 extern int copy_links;
  62 extern int copy_unsafe_links;
  63 extern int protocol_version;
  64 extern int sanitize_paths;
  65
  66 extern int read_batch;
  67 extern int write_batch;
  68
  69 extern struct exclude_struct **exclude_list;
  70 extern struct exclude_struct **server_exclude_list;
  71 extern struct exclude_struct **local_exclude_list;
  72
  73 int io_error;
  74
  75 static struct file_struct null_file;
  76 static char empty_sum[MD4_SUM_LENGTH];
  77
  78 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  79
  80
  81 static int show_filelist_p(void)
  82 {
  83         return verbose && (recurse || files_from) && !am_server;
  84 }
  85
  86 static void start_filelist_progress(char *kind)
  87 {
  88         rprintf(FINFO, "%s ... ", kind);
  89         if ((verbose > 1) || do_progress)
  90                 rprintf(FINFO, "\n");
  91         rflush(FINFO);
  92 }
  93
  94
  95 static void emit_filelist_progress(const struct file_list *flist)
  96 {
  97         rprintf(FINFO, " %d files...\r", flist->count);
  98 }
  99
 100
 101 static void maybe_emit_filelist_progress(const struct file_list *flist)
 102 {
 103         if (do_progress && show_filelist_p() && ((flist->count % 100) == 0))
 104                 emit_filelist_progress(flist);
 105 }
 106
 107
 108 static void finish_filelist_progress(const struct file_list *flist)
 109 {
 110         if (do_progress) {
 111                 /* This overwrites the progress line */
 112                 rprintf(FINFO, "%d file%sto consider\n",
 113                         flist->count, flist->count == 1 ? " " : "s ");
 114         } else
 115                 rprintf(FINFO, "done\n");
 116 }
 117
 118 void show_flist_stats(void)
 119 {
 120         /* Nothing yet */
 121 }
 122
 123
 124 static struct string_area *string_area_new(int size)
 125 {
 126         struct string_area *a;
 127
 128         if (size <= 0)
 129                 size = ARENA_SIZE;
 130         a = new(struct string_area);
 131         if (!a)
 132                 out_of_memory("string_area_new");
 133         a->current = a->base = new_array(char, size);
 134         if (!a->current)
 135                 out_of_memory("string_area_new buffer");
 136         a->end = a->base + size;
 137         a->next = NULL;
 138
 139         return a;
 140 }
 141
 142 static void string_area_free(struct string_area *a)
 143 {
 144         struct string_area *next;
 145
 146         for (; a; a = next) {
 147                 next = a->next;
 148                 free(a->base);
 149         }
 150 }
 151
 152 static char *string_area_malloc(struct string_area **ap, int size)
 153 {
 154         char *p;
 155         struct string_area *a;
 156
 157         /* does the request fit into the current space? */
 158         a = *ap;
 159         if (a->current + size >= a->end) {
 160                 /* no; get space, move new string_area to front of the list */
 161                 a = string_area_new(size > ARENA_SIZE ? size : ARENA_SIZE);
 162                 a->next = *ap;
 163                 *ap = a;
 164         }
 165
 166         /* have space; do the "allocation." */
 167         p = a->current;
 168         a->current += size;
 169         return p;
 170 }
 171
 172 static char *string_area_strdup(struct string_area **ap, const char *src)
 173 {
 174         char *dest = string_area_malloc(ap, strlen(src) + 1);
 175         return strcpy(dest, src);
 176 }
 177
 178 static void list_file_entry(struct file_struct *f)
 179 {
 180         char perms[11];
 181
 182         if (!f->basename)
 183                 /* this can happen if duplicate names were removed */
 184                 return;
 185
 186         permstring(perms, f->mode);
 187
 188         if (preserve_links && S_ISLNK(f->mode)) {
 189                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 190                         perms,
 191                         (double) f->length, timestring(f->modtime),
 192                         f_name(f), f->u.link);
 193         } else {
 194                 rprintf(FINFO, "%s %11.0f %s %s\n",
 195                         perms,
 196                         (double) f->length, timestring(f->modtime),
 197                         f_name(f));
 198         }
 199 }
 200
 201
 202 /**
 203  * Stat either a symlink or its referent, depending on the settings of
 204  * copy_links, copy_unsafe_links, etc.
 205  *
 206  * @retval -1 on error
 207  *
 208  * @retval 0 for success
 209  *
 210  * @post If @p path is a symlink, then @p linkbuf (of size @c
 211  * MAXPATHLEN) contains the symlink target.
 212  *
 213  * @post @p buffer contains information about the link or the
 214  * referrent as appropriate, if they exist.
 215  **/
 216 int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 217 {
 218 #if SUPPORT_LINKS
 219         if (copy_links)
 220                 return do_stat(path, buffer);
 221         if (do_lstat(path, buffer) == -1)
 222                 return -1;
 223         if (S_ISLNK(buffer->st_mode)) {
 224                 int l = readlink((char *) path, linkbuf, MAXPATHLEN - 1);
 225                 if (l == -1)
 226                         return -1;
 227                 linkbuf[l] = 0;
 228                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 229                         if (verbose > 1) {
 230                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 231                                         path, linkbuf);
 232                         }
 233                         return do_stat(path, buffer);
 234                 }
 235         }
 236         return 0;
 237 #else
 238         return do_stat(path, buffer);
 239 #endif
 240 }
 241
 242 int link_stat(const char *path, STRUCT_STAT * buffer)
 243 {
 244 #if SUPPORT_LINKS
 245         if (copy_links)
 246                 return do_stat(path, buffer);
 247         return do_lstat(path, buffer);
 248 #else
 249         return do_stat(path, buffer);
 250 #endif
 251 }
 252
 253 /*
 254  * This function is used to check if a file should be included/excluded
 255  * from the list of files based on its name and type etc.  The value of
 256  * exclude_level is set to either SERVER_EXCLUDES or ALL_EXCLUDES.
 257  */
 258 static int check_exclude_file(char *fname, int is_dir, int exclude_level)
 259 {
 260 #if 0 /* This currently never happens, so avoid a useless compare. */
 261         if (exclude_level == NO_EXCLUDES)
 262                 return 0;
 263 #endif
 264         if (fname) {
 265                 /* never exclude '.', even if somebody does --exclude '*' */
 266                 if (fname[0] == '.' && !fname[1])
 267                         return 0;
 268                 /* Handle the -R version of the '.' dir. */
 269                 if (fname[0] == '/') {
 270                         int len = strlen(fname);
 271                         if (fname[len-1] == '.' && fname[len-2] == '/')
 272                                 return 0;
 273                 }
 274         }
 275         if (server_exclude_list
 276          && check_exclude(server_exclude_list, fname, is_dir))
 277                 return 1;
 278         if (exclude_level != ALL_EXCLUDES)
 279                 return 0;
 280         if (exclude_list && check_exclude(exclude_list, fname, is_dir))
 281                 return 1;
 282         if (local_exclude_list
 283          && check_exclude(local_exclude_list, fname, is_dir))
 284                 return 1;
 285         return 0;
 286 }
 287
 288 /* used by the one_file_system code */
 289 static dev_t filesystem_dev;
 290
 291 static void set_filesystem(char *fname)
 292 {
 293         STRUCT_STAT st;
 294         if (link_stat(fname, &st) != 0)
 295                 return;
 296
 297         filesystem_dev = st.st_dev;
 298 }
 299
 300
 301 static int to_wire_mode(mode_t mode)
 302 {
 303         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 304                 return (mode & ~(_S_IFMT)) | 0120000;
 305         return (int) mode;
 306 }
 307
 308 static mode_t from_wire_mode(int mode)
 309 {
 310         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 311                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 312         return (mode_t) mode;
 313 }
 314
 315
 316 static void send_directory(int f, struct file_list *flist, char *dir);
 317
 318 static char *flist_dir;
 319 static int flist_dir_len;
 320
 321
 322 /**
 323  * Make sure @p flist is big enough to hold at least @p flist->count
 324  * entries.
 325  **/
 326 static void flist_expand(struct file_list *flist)
 327 {
 328         if (flist->count >= flist->malloced) {
 329                 void *new_ptr;
 330
 331                 if (flist->malloced < 1000)
 332                         flist->malloced += 1000;
 333                 else
 334                         flist->malloced *= 2;
 335
 336                 if (flist->files) {
 337                         new_ptr = realloc_array(flist->files,
 338                                                 struct file_struct *,
 339                                                 flist->malloced);
 340                 } else {
 341                         new_ptr = new_array(struct file_struct *,
 342                                             flist->malloced);
 343                 }
 344
 345                 if (verbose >= 2) {
 346                         rprintf(FINFO, "expand file_list to %.0f bytes, did%s move\n",
 347                                 (double)sizeof(flist->files[0])
 348                                 * flist->malloced,
 349                                 (new_ptr == flist->files) ? " not" : "");
 350                 }
 351
 352                 flist->files = (struct file_struct **) new_ptr;
 353
 354                 if (!flist->files)
 355                         out_of_memory("flist_expand");
 356         }
 357 }
 358
 359 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 360 {
 361         unsigned short flags;
 362         static time_t modtime;
 363         static mode_t mode;
 364         static DEV64_T rdev;    /* just high bytes in p28 onward */
 365         static DEV64_T dev;
 366         static uid_t uid;
 367         static gid_t gid;
 368         static char lastname[MAXPATHLEN];
 369         char *fname, fbuf[MAXPATHLEN];
 370         int l1, l2;
 371
 372         if (f == -1)
 373                 return;
 374
 375         if (!file) {
 376                 write_byte(f, 0);
 377                 modtime = 0, mode = 0;
 378                 rdev = 0, dev = 0;
 379                 uid = 0, gid = 0;
 380                 *lastname = '\0';
 381                 return;
 382         }
 383
 384         io_write_phase = "send_file_entry";
 385
 386         fname = f_name_to(file, fbuf);
 387
 388         flags = base_flags;
 389
 390         if (file->mode == mode)
 391                 flags |= SAME_MODE;
 392         else
 393                 mode = file->mode;
 394         if (preserve_devices) {
 395                 if (protocol_version < 28) {
 396                         if (IS_DEVICE(mode)) {
 397                                 if (file->u.rdev == rdev) {
 398                                         /* Set both flags so that the test when
 399                                          * writing the data is simpler. */
 400                                         flags |= SAME_RDEV_pre28|SAME_HIGH_RDEV;
 401                                 } else
 402                                         rdev = file->u.rdev;
 403                         } else
 404                                 rdev = 0;
 405                 } else if (IS_DEVICE(mode)) {
 406                         if ((file->u.rdev & ~0xFF) == rdev)
 407                                 flags |= SAME_HIGH_RDEV;
 408                         else
 409                                 rdev = file->u.rdev & ~0xFF;
 410                 }
 411         }
 412         if (file->uid == uid)
 413                 flags |= SAME_UID;
 414         else
 415                 uid = file->uid;
 416         if (file->gid == gid)
 417                 flags |= SAME_GID;
 418         else
 419                 gid = file->gid;
 420         if (file->modtime == modtime)
 421                 flags |= SAME_TIME;
 422         else
 423                 modtime = file->modtime;
 424         if (file->link_u.idev) {
 425                 if (file->F_DEV == dev) {
 426                         if (protocol_version >= 28)
 427                                 flags |= SAME_DEV;
 428                 } else
 429                         dev = file->F_DEV;
 430                 flags |= HAS_INODE_DATA;
 431         }
 432
 433         for (l1 = 0;
 434              lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 435              l1++) {}
 436         l2 = strlen(fname+l1);
 437
 438         if (l1 > 0)
 439                 flags |= SAME_NAME;
 440         if (l2 > 255)
 441                 flags |= LONG_NAME;
 442
 443         /* We must make sure we don't send a zero flags byte or
 444          * the other end will terminate the flist transfer. */
 445         if (flags == 0 && !S_ISDIR(mode))
 446                 flags |= FLAG_DELETE; /* NOTE: no meaning for non-dir */
 447         if (protocol_version >= 28) {
 448                 if ((flags & 0xFF00) || flags == 0) {
 449                         flags |= EXTENDED_FLAGS;
 450                         write_byte(f, flags);
 451                         write_byte(f, flags >> 8);
 452                 } else
 453                         write_byte(f, flags);
 454         } else {
 455                 if (flags == 0)
 456                         flags |= LONG_NAME;
 457                 write_byte(f, flags);
 458         }
 459         if (flags & SAME_NAME)
 460                 write_byte(f, l1);
 461         if (flags & LONG_NAME)
 462                 write_int(f, l2);
 463         else
 464                 write_byte(f, l2);
 465         write_buf(f, fname + l1, l2);
 466
 467         write_longint(f, file->length);
 468         if (!(flags & SAME_TIME))
 469                 write_int(f, modtime);
 470         if (!(flags & SAME_MODE))
 471                 write_int(f, to_wire_mode(mode));
 472         if (preserve_uid && !(flags & SAME_UID)) {
 473                 add_uid(uid);
 474                 write_int(f, uid);
 475         }
 476         if (preserve_gid && !(flags & SAME_GID)) {
 477                 add_gid(gid);
 478                 write_int(f, gid);
 479         }
 480         if (preserve_devices && IS_DEVICE(mode)) {
 481                 /* If SAME_HIGH_RDEV is off, SAME_RDEV_pre28 is also off.
 482                  * Also, avoid using "rdev" because it may be incomplete. */
 483                 if (!(flags & SAME_HIGH_RDEV))
 484                         write_int(f, file->u.rdev);
 485                 else if (protocol_version >= 28)
 486                         write_byte(f, file->u.rdev);
 487         }
 488
 489 #if SUPPORT_LINKS
 490         if (preserve_links && S_ISLNK(mode)) {
 491                 write_int(f, strlen(file->u.link));
 492                 write_buf(f, file->u.link, strlen(file->u.link));
 493         }
 494 #endif
 495
 496 #if SUPPORT_HARD_LINKS
 497         if (flags & HAS_INODE_DATA) {
 498                 if (protocol_version < 26) {
 499                         /* 32-bit dev_t and ino_t */
 500                         write_int(f, dev);
 501                         write_int(f, file->F_INODE);
 502                 } else {
 503                         /* 64-bit dev_t and ino_t */
 504                         if (!(flags & SAME_DEV))
 505                                 write_longint(f, dev);
 506                         write_longint(f, file->F_INODE);
 507                 }
 508         }
 509 #endif
 510
 511         if (always_checksum) {
 512                 char *sum;
 513                 if (S_ISREG(mode))
 514                         sum = file->u.sum;
 515                 else if (protocol_version < 28) {
 516                         /* Prior to 28, we sent a useless set of nulls. */
 517                         sum = empty_sum;
 518                 } else
 519                         sum = NULL;
 520                 if (sum) {
 521                         write_buf(f, sum, protocol_version < 21? 2
 522                                                         : MD4_SUM_LENGTH);
 523                 }
 524         }
 525
 526         strlcpy(lastname, fname, MAXPATHLEN);
 527
 528         io_write_phase = "unknown";
 529 }
 530
 531
 532
 533 void receive_file_entry(struct file_struct **fptr, unsigned short flags, int f)
 534 {
 535         static time_t modtime;
 536         static mode_t mode;
 537         static DEV64_T rdev;    /* just high bytes in p28 onward */
 538         static DEV64_T dev;
 539         static uid_t uid;
 540         static gid_t gid;
 541         static char lastname[MAXPATHLEN];
 542         char thisname[MAXPATHLEN];
 543         unsigned int l1 = 0, l2 = 0;
 544         char *p;
 545         struct file_struct *file;
 546
 547         if (!fptr) {
 548                 modtime = 0, mode = 0;
 549                 rdev = 0, dev = 0;
 550                 uid = 0, gid = 0;
 551                 *lastname = '\0';
 552                 return;
 553         }
 554
 555         if (flags & SAME_NAME)
 556                 l1 = read_byte(f);
 557
 558         if (flags & LONG_NAME)
 559                 l2 = read_int(f);
 560         else
 561                 l2 = read_byte(f);
 562
 563         file = new(struct file_struct);
 564         if (!file)
 565                 out_of_memory("receive_file_entry");
 566         memset((char *) file, 0, sizeof(*file));
 567         (*fptr) = file;
 568
 569         if (l2 >= MAXPATHLEN - l1) {
 570                 rprintf(FERROR,
 571                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 572                         flags, l1, l2, lastname);
 573                 overflow("receive_file_entry");
 574         }
 575
 576         strlcpy(thisname, lastname, l1 + 1);
 577         read_sbuf(f, &thisname[l1], l2);
 578         thisname[l1 + l2] = 0;
 579
 580         strlcpy(lastname, thisname, MAXPATHLEN);
 581         lastname[MAXPATHLEN - 1] = 0;
 582
 583         clean_fname(thisname);
 584
 585         if (sanitize_paths) {
 586                 sanitize_path(thisname, NULL);
 587         }
 588
 589         if ((p = strrchr(thisname, '/'))) {
 590                 static char *lastdir;
 591                 *p = 0;
 592                 if (lastdir && strcmp(thisname, lastdir) == 0)
 593                         file->dirname = lastdir;
 594                 else {
 595                         file->dirname = strdup(thisname);
 596                         lastdir = file->dirname;
 597                 }
 598                 file->basename = strdup(p + 1);
 599         } else {
 600                 file->dirname = NULL;
 601                 file->basename = strdup(thisname);
 602         }
 603
 604         if (!file->basename)
 605                 out_of_memory("receive_file_entry 1");
 606
 607         file->flags = flags & LIVE_FLAGS;
 608         file->length = read_longint(f);
 609         if (!(flags & SAME_TIME))
 610                 modtime = (time_t)read_int(f);
 611         file->modtime = modtime;
 612         if (!(flags & SAME_MODE))
 613                 mode = from_wire_mode(read_int(f));
 614         file->mode = mode;
 615
 616         if (preserve_uid) {
 617                 if (!(flags & SAME_UID))
 618                         uid = (uid_t)read_int(f);
 619                 file->uid = uid;
 620         }
 621         if (preserve_gid) {
 622                 if (!(flags & SAME_GID))
 623                         gid = (gid_t)read_int(f);
 624                 file->gid = gid;
 625         }
 626         if (preserve_devices) {
 627                 if (protocol_version < 28) {
 628                         if (IS_DEVICE(mode)) {
 629                                 if (!(flags & SAME_RDEV_pre28))
 630                                         rdev = (DEV64_T)read_int(f);
 631                                 file->u.rdev = rdev;
 632                         } else
 633                                 rdev = 0;
 634                 } else if (IS_DEVICE(mode)) {
 635                         if (!(flags & SAME_HIGH_RDEV)) {
 636                                 file->u.rdev = (DEV64_T)read_int(f);
 637                                 rdev = file->u.rdev & ~0xFF;
 638                         } else
 639                                 file->u.rdev = rdev | (DEV64_T)read_byte(f);
 640                 }
 641         }
 642
 643         if (preserve_links && S_ISLNK(mode)) {
 644                 int l = read_int(f);
 645                 if (l < 0) {
 646                         rprintf(FERROR, "overflow: l=%d\n", l);
 647                         overflow("receive_file_entry");
 648                 }
 649                 if (!(file->u.link = new_array(char, l + 1)))
 650                         out_of_memory("receive_file_entry 2");
 651                 read_sbuf(f, file->u.link, l);
 652                 if (sanitize_paths)
 653                         sanitize_path(file->u.link, file->dirname);
 654         }
 655 #if SUPPORT_HARD_LINKS
 656         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 657                 flags |= HAS_INODE_DATA;
 658         if (flags & HAS_INODE_DATA) {
 659                 if (!(file->link_u.idev = new(struct idev)))
 660                         out_of_memory("file inode data");
 661                 if (protocol_version < 26) {
 662                         dev = read_int(f);
 663                         file->F_INODE = read_int(f);
 664                 } else {
 665                         if (!(flags & SAME_DEV))
 666                                 dev = read_longint(f);
 667                         file->F_INODE = read_longint(f);
 668                 }
 669                 file->F_DEV = dev;
 670         }
 671 #endif
 672
 673         if (always_checksum) {
 674                 char *sum;
 675                 if (S_ISREG(mode)) {
 676                         sum = file->u.sum = new_array(char, MD4_SUM_LENGTH);
 677                         if (!sum)
 678                                 out_of_memory("md4 sum");
 679                 } else if (protocol_version < 28) {
 680                         /* Prior to 28, we get a useless set of nulls. */
 681                         sum = empty_sum;
 682                 } else
 683                         sum = NULL;
 684                 if (sum) {
 685                         read_buf(f, sum, protocol_version < 21? 2
 686                                                 : MD4_SUM_LENGTH);
 687                 }
 688         }
 689
 690         if (!preserve_perms) {
 691                 extern int orig_umask;
 692                 /* set an appropriate set of permissions based on original
 693                  * permissions and umask. This emulates what GNU cp does */
 694                 file->mode &= ~orig_umask;
 695         }
 696 }
 697
 698
 699 /* determine if a file in a different filesystem should be skipped
 700    when one_file_system is set. We bascally only want to include
 701    the mount points - but they can be hard to find! */
 702 static int skip_filesystem(char *fname, STRUCT_STAT * st)
 703 {
 704         STRUCT_STAT st2;
 705
 706         /* skip all but directories */
 707         if (!S_ISDIR(st->st_mode))
 708                 return 1;
 709
 710         /* if its not a subdirectory then allow */
 711         if (!strrchr(fname, '/'))
 712                 return 0;
 713
 714         if (link_stat(fname, &st2) != 0) {
 715                 return 0;
 716         }
 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
 750         if (strlcpy(cleaned_name, fname, sizeof cleaned_name)
 751             >= sizeof cleaned_name - flist_dir_len) {
 752                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 753                 return NULL;
 754         }
 755         clean_fname(cleaned_name);
 756         if (sanitize_paths)
 757                 sanitize_path(cleaned_name, NULL);
 758         fname = cleaned_name;
 759
 760         memset(sum, 0, SUM_LENGTH);
 761
 762         if (readlink_stat(fname, &st, linkbuf) != 0) {
 763                 int save_errno = errno;
 764                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
 765                         /* either symlink pointing nowhere or file that
 766                          * was removed during rsync run; see if excluded
 767                          * before reporting an error */
 768                         if (check_exclude_file(fname, 0, exclude_level)) {
 769                                 /* file is excluded anyway, ignore silently */
 770                                 return NULL;
 771                         }
 772                 }
 773                 io_error |= IOERR_GENERAL;
 774                 rprintf(FERROR, "readlink %s failed: %s\n",
 775                         full_fname(fname), strerror(save_errno));
 776                 return NULL;
 777         }
 778
 779         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 780         if (exclude_level == NO_EXCLUDES)
 781                 goto skip_excludes;
 782
 783         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 784                 rprintf(FINFO, "skipping directory %s\n", fname);
 785                 return NULL;
 786         }
 787
 788         if (one_file_system && st.st_dev != filesystem_dev) {
 789                 if (skip_filesystem(fname, &st))
 790                         return NULL;
 791         }
 792
 793         if (check_exclude_file(fname, S_ISDIR(st.st_mode) != 0, exclude_level))
 794                 return NULL;
 795
 796         if (lp_ignore_nonreadable(module_id) && access(fname, R_OK) != 0)
 797                 return NULL;
 798
 799       skip_excludes:
 800
 801         if (verbose > 2)
 802                 rprintf(FINFO, "make_file(%s,*,%d)\n", fname, exclude_level);
 803
 804         file = new(struct file_struct);
 805         if (!file)
 806                 out_of_memory("make_file");
 807         memset((char *) file, 0, sizeof(*file));
 808
 809         if ((p = strrchr(fname, '/'))) {
 810                 static char *lastdir;
 811                 *p = 0;
 812                 if (lastdir && strcmp(fname, lastdir) == 0)
 813                         file->dirname = lastdir;
 814                 else {
 815                         file->dirname = strdup(fname);
 816                         lastdir = file->dirname;
 817                 }
 818                 file->basename = STRDUP(ap, p + 1);
 819                 *p = '/';
 820         } else {
 821                 file->dirname = NULL;
 822                 file->basename = STRDUP(ap, fname);
 823         }
 824
 825         file->modtime = st.st_mtime;
 826         file->length = st.st_size;
 827         file->mode = st.st_mode;
 828         file->uid = st.st_uid;
 829         file->gid = st.st_gid;
 830         if (preserve_hard_links) {
 831                 if (protocol_version < 28 ? S_ISREG(st.st_mode)
 832                     : !S_ISDIR(st.st_mode) && st.st_nlink > 1) {
 833                         if (!(file->link_u.idev = new(struct idev)))
 834                                 out_of_memory("file inode data");
 835                         file->F_DEV = st.st_dev;
 836                         file->F_INODE = st.st_ino;
 837                 }
 838         }
 839 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 840         if (IS_DEVICE(st.st_mode))
 841                 file->u.rdev = st.st_rdev;
 842 #endif
 843
 844 #if SUPPORT_LINKS
 845         if (S_ISLNK(st.st_mode))
 846                 file->u.link = STRDUP(ap, linkbuf);
 847 #endif
 848
 849         if (always_checksum && S_ISREG(st.st_mode)) {
 850                 if (!(file->u.sum = (char*)MALLOC(ap, MD4_SUM_LENGTH)))
 851                         out_of_memory("md4 sum");
 852                 file_checksum(fname, file->u.sum, st.st_size);
 853         }
 854
 855         file->basedir = flist_dir;
 856
 857         if (!S_ISDIR(st.st_mode))
 858                 stats.total_size += st.st_size;
 859
 860         return file;
 861 }
 862
 863
 864 void send_file_name(int f, struct file_list *flist, char *fname,
 865                     int recursive, unsigned short base_flags)
 866 {
 867         struct file_struct *file;
 868         char fbuf[MAXPATHLEN];
 869         extern int delete_excluded;
 870
 871         /* f is set to -1 when calculating deletion file list */
 872         file = make_file(fname, &flist->string_area,
 873                          f == -1 && delete_excluded? SERVER_EXCLUDES
 874                                                    : ALL_EXCLUDES);
 875
 876         if (!file)
 877                 return;
 878
 879         maybe_emit_filelist_progress(flist);
 880
 881         flist_expand(flist);
 882
 883         if (write_batch)
 884                 file->flags |= FLAG_DELETE;
 885
 886         if (file->basename[0]) {
 887                 flist->files[flist->count++] = file;
 888                 send_file_entry(file, f, base_flags);
 889         }
 890
 891         if (S_ISDIR(file->mode) && recursive) {
 892                 struct exclude_struct **last_exclude_list =
 893                     local_exclude_list;
 894                 send_directory(f, flist, f_name_to(file, fbuf));
 895                 local_exclude_list = last_exclude_list;
 896                 return;
 897         }
 898 }
 899
 900
 901 static void send_directory(int f, struct file_list *flist, char *dir)
 902 {
 903         DIR *d;
 904         struct dirent *di;
 905         char fname[MAXPATHLEN];
 906         unsigned int offset;
 907         char *p;
 908
 909         d = opendir(dir);
 910         if (!d) {
 911                 io_error |= IOERR_GENERAL;
 912                 rprintf(FERROR, "opendir %s failed: %s\n",
 913                         full_fname(dir), strerror(errno));
 914                 return;
 915         }
 916
 917         offset = strlcpy(fname, dir, MAXPATHLEN);
 918         p = fname + offset;
 919         if (offset >= MAXPATHLEN || p[-1] != '/') {
 920                 if (offset >= MAXPATHLEN - 1) {
 921                         io_error |= IOERR_GENERAL;
 922                         rprintf(FERROR, "skipping long-named directory: %s\n",
 923                                 full_fname(fname));
 924                         closedir(d);
 925                         return;
 926                 }
 927                 *p++ = '/';
 928                 offset++;
 929         }
 930
 931         local_exclude_list = NULL;
 932
 933         if (cvs_exclude) {
 934                 if (strlcpy(p, ".cvsignore", MAXPATHLEN - offset)
 935                     < MAXPATHLEN - offset)
 936                         add_exclude_file(&local_exclude_list,fname,MISSING_OK,ADD_EXCLUDE);
 937                 else {
 938                         io_error |= IOERR_GENERAL;
 939                         rprintf(FINFO,
 940                                 "cannot cvs-exclude in long-named directory %s\n",
 941                                 full_fname(fname));
 942                 }
 943         }
 944
 945         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 946                 char *dname = d_name(di);
 947                 if (dname[0] == '.' && (dname[1] == '\0'
 948                     || (dname[1] == '.' && dname[2] == '\0')))
 949                         continue;
 950                 if (strlcpy(p, dname, MAXPATHLEN - offset) < MAXPATHLEN - offset)
 951                         send_file_name(f, flist, fname, recurse, 0);
 952                 else {
 953                         io_error |= IOERR_GENERAL;
 954                         rprintf(FINFO,
 955                                 "cannot send long-named file %s\n",
 956                                 full_fname(fname));
 957                 }
 958         }
 959         if (errno) {
 960                 io_error |= IOERR_GENERAL;
 961                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
 962                         dir, errno, strerror(errno));
 963         }
 964
 965         if (local_exclude_list)
 966                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
 967
 968         closedir(d);
 969 }
 970
 971
 972 /**
 973  * The delete_files() function in receiver.c sets f to -1 so that we just
 974  * construct the file list in memory without sending it over the wire.  It
 975  * also has the side-effect of ignoring user-excludes if delete_excluded
 976  * is set (so that the delete list includes user-excluded files).
 977  **/
 978 struct file_list *send_file_list(int f, int argc, char *argv[])
 979 {
 980         int l;
 981         STRUCT_STAT st;
 982         char *p, *dir, olddir[sizeof curr_dir];
 983         char lastpath[MAXPATHLEN] = "";
 984         struct file_list *flist;
 985         int64 start_write;
 986         int use_ff_fd = 0;
 987
 988         if (show_filelist_p() && f != -1)
 989                 start_filelist_progress("building file list");
 990
 991         start_write = stats.total_written;
 992
 993         flist = flist_new();
 994
 995         if (f != -1) {
 996                 io_start_buffering_out(f);
 997                 if (filesfrom_fd >= 0) {
 998                         if (argv[0] && !push_dir(argv[0])) {
 999                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1000                                         full_fname(argv[0]), strerror(errno));
1001                                 exit_cleanup(RERR_FILESELECT);
1002                         }
1003                         use_ff_fd = 1;
1004                 }
1005         }
1006
1007         while (1) {
1008                 char fname2[MAXPATHLEN];
1009                 char *fname = fname2;
1010
1011                 if (use_ff_fd) {
1012                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1013                                 break;
1014                         sanitize_path(fname, NULL);
1015                 } else {
1016                         if (argc-- == 0)
1017                                 break;
1018                         strlcpy(fname, *argv++, MAXPATHLEN);
1019                         if (sanitize_paths)
1020                                 sanitize_path(fname, NULL);
1021                 }
1022
1023                 l = strlen(fname);
1024                 if (fname[l - 1] == '/') {
1025                         if (l == 2 && fname[0] == '.') {
1026                                 /* Turn "./" into just "." rather than "./." */
1027                                 fname[1] = '\0';
1028                         } else if (l < MAXPATHLEN) {
1029                                 fname[l++] = '.';
1030                                 fname[l] = '\0';
1031                         }
1032                 }
1033
1034                 if (link_stat(fname, &st) != 0) {
1035                         if (f != -1) {
1036                                 io_error |= IOERR_GENERAL;
1037                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1038                                         full_fname(fname), strerror(errno));
1039                         }
1040                         continue;
1041                 }
1042
1043                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1044                         rprintf(FINFO, "skipping directory %s\n", fname);
1045                         continue;
1046                 }
1047
1048                 dir = NULL;
1049                 olddir[0] = '\0';
1050
1051                 if (!relative_paths) {
1052                         p = strrchr(fname, '/');
1053                         if (p) {
1054                                 *p = 0;
1055                                 if (p == fname)
1056                                         dir = "/";
1057                                 else
1058                                         dir = fname;
1059                                 fname = p + 1;
1060                         }
1061                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1062                         /* this ensures we send the intermediate directories,
1063                            thus getting their permissions right */
1064                         char *lp = lastpath, *fn = fname, *slash = fname;
1065                         *p = 0;
1066                         /* Skip any initial directories in our path that we
1067                          * have in common with lastpath. */
1068                         while (*fn && *lp == *fn) {
1069                                 if (*fn == '/')
1070                                         slash = fn;
1071                                 lp++, fn++;
1072                         }
1073                         *p = '/';
1074                         if (fn != p || (*lp && *lp != '/')) {
1075                                 int copy_links_saved = copy_links;
1076                                 int recurse_saved = recurse;
1077                                 copy_links = copy_unsafe_links;
1078                                 /* set recurse to 1 to prevent make_file
1079                                  * from ignoring directory, but still
1080                                  * turn off the recursive parameter to
1081                                  * send_file_name */
1082                                 recurse = 1;
1083                                 while ((slash = strchr(slash+1, '/')) != 0) {
1084                                         *slash = 0;
1085                                         send_file_name(f, flist, fname, 0, 0);
1086                                         *slash = '/';
1087                                 }
1088                                 copy_links = copy_links_saved;
1089                                 recurse = recurse_saved;
1090                                 *p = 0;
1091                                 strlcpy(lastpath, fname, sizeof lastpath);
1092                                 *p = '/';
1093                         }
1094                 }
1095
1096                 if (!*fname)
1097                         fname = ".";
1098
1099                 if (dir && *dir) {
1100                         static char *lastdir;
1101                         static int lastdir_len;
1102
1103                         strcpy(olddir, curr_dir); /* can't overflow */
1104
1105                         if (!push_dir(dir)) {
1106                                 io_error |= IOERR_GENERAL;
1107                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1108                                         full_fname(dir), strerror(errno));
1109                                 continue;
1110                         }
1111
1112                         if (lastdir && strcmp(lastdir, dir) == 0) {
1113                                 flist_dir = lastdir;
1114                                 flist_dir_len = lastdir_len;
1115                         } else {
1116                                 if (lastdir)
1117                                         free(lastdir);
1118                                 flist_dir = lastdir = strdup(dir);
1119                                 flist_dir_len = lastdir_len = strlen(dir);
1120                         }
1121                 }
1122
1123                 if (one_file_system)
1124                         set_filesystem(fname);
1125
1126                 send_file_name(f, flist, fname, recurse, FLAG_DELETE);
1127
1128                 if (olddir[0]) {
1129                         flist_dir = NULL;
1130                         flist_dir_len = 0;
1131                         if (!pop_dir(olddir)) {
1132                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1133                                         full_fname(dir), strerror(errno));
1134                                 exit_cleanup(RERR_FILESELECT);
1135                         }
1136                 }
1137         }
1138
1139         if (f != -1) {
1140                 send_file_entry(NULL, f, 0);
1141
1142                 if (show_filelist_p())
1143                         finish_filelist_progress(flist);
1144         }
1145
1146         clean_flist(flist, 0, 0);
1147
1148         if (f != -1) {
1149                 /* Now send the uid/gid list. This was introduced in
1150                  * protocol version 15 */
1151                 send_uid_list(f);
1152
1153                 /* send the io_error flag */
1154                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1155
1156                 io_end_buffering();
1157                 stats.flist_size = stats.total_written - start_write;
1158                 stats.num_files = flist->count;
1159                 if (write_batch)
1160                         write_batch_flist_info(flist->count, flist->files);
1161         }
1162
1163         if (verbose > 2)
1164                 rprintf(FINFO, "send_file_list done\n");
1165
1166         return flist;
1167 }
1168
1169
1170 struct file_list *recv_file_list(int f)
1171 {
1172         struct file_list *flist;
1173         unsigned short flags;
1174         int64 start_read;
1175         extern int list_only;
1176
1177         if (show_filelist_p())
1178                 start_filelist_progress("receiving file list");
1179
1180         start_read = stats.total_read;
1181
1182         flist = new(struct file_list);
1183         if (!flist)
1184                 goto oom;
1185
1186         flist->count = 0;
1187         flist->malloced = 1000;
1188         flist->files = new_array(struct file_struct *, flist->malloced);
1189         if (!flist->files)
1190                 goto oom;
1191
1192
1193         while ((flags = read_byte(f)) != 0) {
1194                 int i = flist->count;
1195
1196                 flist_expand(flist);
1197
1198                 if (protocol_version >= 28 && (flags & EXTENDED_FLAGS))
1199                         flags |= read_byte(f) << 8;
1200                 receive_file_entry(&flist->files[i], flags, f);
1201
1202                 if (S_ISREG(flist->files[i]->mode))
1203                         stats.total_size += flist->files[i]->length;
1204
1205                 flist->count++;
1206
1207                 maybe_emit_filelist_progress(flist);
1208
1209                 if (verbose > 2) {
1210                         rprintf(FINFO, "recv_file_name(%s)\n",
1211                                 f_name(flist->files[i]));
1212                 }
1213         }
1214         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1215
1216         if (verbose > 2)
1217                 rprintf(FINFO, "received %d names\n", flist->count);
1218
1219         if (show_filelist_p())
1220                 finish_filelist_progress(flist);
1221
1222         clean_flist(flist, relative_paths, 1);
1223
1224         if (f != -1) {
1225                 /* Now send the uid/gid list. This was introduced in
1226                  * protocol version 15 */
1227                 recv_uid_list(f, flist);
1228
1229                 if (!read_batch) {
1230                         /* Recv the io_error flag */
1231                         if (lp_ignore_errors(module_id) || ignore_errors)
1232                                 read_int(f);
1233                         else
1234                                 io_error |= read_int(f);
1235                 }
1236         }
1237
1238         if (list_only) {
1239                 int i;
1240                 for (i = 0; i < flist->count; i++)
1241                         list_file_entry(flist->files[i]);
1242         }
1243
1244         if (verbose > 2)
1245                 rprintf(FINFO, "recv_file_list done\n");
1246
1247         stats.flist_size = stats.total_read - start_read;
1248         stats.num_files = flist->count;
1249
1250         return flist;
1251
1252       oom:
1253         out_of_memory("recv_file_list");
1254         return NULL;            /* not reached */
1255 }
1256
1257
1258 int file_compare(struct file_struct **file1, struct file_struct **file2)
1259 {
1260         struct file_struct *f1 = *file1;
1261         struct file_struct *f2 = *file2;
1262
1263         if (!f1->basename && !f2->basename)
1264                 return 0;
1265         if (!f1->basename)
1266                 return -1;
1267         if (!f2->basename)
1268                 return 1;
1269         if (f1->dirname == f2->dirname)
1270                 return u_strcmp(f1->basename, f2->basename);
1271         return f_name_cmp(f1, f2);
1272 }
1273
1274
1275 int flist_find(struct file_list *flist, struct file_struct *f)
1276 {
1277         int low = 0, high = flist->count - 1;
1278
1279         while (high >= 0 && !flist->files[high]->basename) high--;
1280
1281         if (high < 0)
1282                 return -1;
1283
1284         while (low != high) {
1285                 int mid = (low + high) / 2;
1286                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1287                 if (ret == 0)
1288                         return flist_up(flist, mid);
1289                 if (ret > 0)
1290                         high = mid;
1291                 else
1292                         low = mid + 1;
1293         }
1294
1295         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1296                 return flist_up(flist, low);
1297         return -1;
1298 }
1299
1300
1301 /*
1302  * free up one file
1303  */
1304 void free_file(struct file_struct *file)
1305 {
1306         if (!file)
1307                 return;
1308         if (file->basename)
1309                 free(file->basename);
1310         if (!IS_DEVICE(file->mode) && file->u.link)
1311                 free(file->u.link); /* Handles u.sum too. */
1312         if (file->link_u.idev)
1313                 free((char*)file->link_u.idev); /* Handles link_u.links too. */
1314         *file = null_file;
1315 }
1316
1317
1318 /*
1319  * allocate a new file list
1320  */
1321 struct file_list *flist_new(void)
1322 {
1323         struct file_list *flist;
1324
1325         flist = new(struct file_list);
1326         if (!flist)
1327                 out_of_memory("send_file_list");
1328
1329         flist->count = 0;
1330         flist->malloced = 0;
1331         flist->files = NULL;
1332
1333 #if ARENA_SIZE > 0
1334         flist->string_area = string_area_new(0);
1335 #else
1336         flist->string_area = NULL;
1337 #endif
1338         return flist;
1339 }
1340
1341 /*
1342  * free up all elements in a flist
1343  */
1344 void flist_free(struct file_list *flist)
1345 {
1346         int i;
1347         for (i = 1; i < flist->count; i++) {
1348                 if (!flist->string_area)
1349                         free_file(flist->files[i]);
1350                 free(flist->files[i]);
1351         }
1352         /* FIXME: I don't think we generally need to blank the flist
1353          * since it's about to be freed.  This will just cause more
1354          * memory traffic.  If you want a freed-memory debugger, you
1355          * know where to get it. */
1356         memset((char *) flist->files, 0,
1357                sizeof(flist->files[0]) * flist->count);
1358         free(flist->files);
1359         if (flist->string_area)
1360                 string_area_free(flist->string_area);
1361         memset((char *) flist, 0, sizeof(*flist));
1362         free(flist);
1363 }
1364
1365
1366 /*
1367  * This routine ensures we don't have any duplicate names in our file list.
1368  * duplicate names can cause corruption because of the pipelining
1369  */
1370 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1371 {
1372         int i, prev_i = 0;
1373
1374         if (!flist || flist->count == 0)
1375                 return;
1376
1377         qsort(flist->files, flist->count,
1378               sizeof(flist->files[0]), (int (*)()) file_compare);
1379
1380         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1381                 if (flist->files[i]->basename) {
1382                         prev_i = i;
1383                         break;
1384                 }
1385         }
1386         while (++i < flist->count) {
1387                 if (!flist->files[i]->basename)
1388                         continue;
1389                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1390                         if (verbose > 1 && !am_server) {
1391                                 rprintf(FINFO,
1392                                         "removing duplicate name %s from file list %d\n",
1393                                         f_name(flist->files[i]), i);
1394                         }
1395                         /* Make sure that if we unduplicate '.', that we don't
1396                          * lose track of a user-specified starting point (or
1397                          * else deletions will mysteriously fail with -R). */
1398                         if (flist->files[i]->flags & FLAG_DELETE)
1399                                 flist->files[prev_i]->flags |= FLAG_DELETE;
1400                         /* it's not great that the flist knows the semantics of
1401                          * the file memory usage, but i'd rather not add a flag
1402                          * byte to that struct.
1403                          * XXX can i use a bit in the flags field? */
1404                         if (flist->string_area)
1405                                 flist->files[i][0] = null_file;
1406                         else
1407                                 free_file(flist->files[i]);
1408                 } else
1409                         prev_i = i;
1410         }
1411
1412         if (strip_root) {
1413                 /* we need to strip off the root directory in the case
1414                    of relative paths, but this must be done _after_
1415                    the sorting phase */
1416                 for (i = 0; i < flist->count; i++) {
1417                         if (flist->files[i]->dirname &&
1418                             flist->files[i]->dirname[0] == '/') {
1419                                 memmove(&flist->files[i]->dirname[0],
1420                                         &flist->files[i]->dirname[1],
1421                                         strlen(flist->files[i]->dirname));
1422                         }
1423
1424                         if (flist->files[i]->dirname &&
1425                             !flist->files[i]->dirname[0]) {
1426                                 flist->files[i]->dirname = NULL;
1427                         }
1428                 }
1429         }
1430
1431         if (verbose <= 3)
1432                 return;
1433
1434         for (i = 0; i < flist->count; i++) {
1435                 rprintf(FINFO, "[%ld] i=%d %s %s mode=0%o len=%.0f\n",
1436                         (long) getpid(), i,
1437                         NS(flist->files[i]->dirname),
1438                         NS(flist->files[i]->basename),
1439                         (int) flist->files[i]->mode,
1440                         (double) flist->files[i]->length);
1441         }
1442 }
1443
1444
1445 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1446
1447 /* Compare the names of two file_struct entities, just like strcmp()
1448  * would do if it were operating on the joined strings.  We assume
1449  * that there are no 0-length strings.
1450  */
1451 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1452 {
1453         int dif;
1454         const uchar *c1, *c2;
1455         enum fnc_state state1, state2;
1456
1457         if (!f1 || !f1->basename) {
1458                 if (!f2 || !f2->basename)
1459                         return 0;
1460                 return -1;
1461         }
1462         if (!f2 || !f2->basename)
1463                 return 1;
1464
1465         if (!(c1 = (uchar*)f1->dirname)) {
1466                 state1 = fnc_BASE;
1467                 c1 = (uchar*)f1->basename;
1468         } else
1469                 state1 = fnc_DIR;
1470         if (!(c2 = (uchar*)f2->dirname)) {
1471                 state2 = fnc_BASE;
1472                 c2 = (uchar*)f2->basename;
1473         } else
1474                 state2 = fnc_DIR;
1475
1476         while (1) {
1477                 if ((dif = (int)*c1 - (int)*c2) != 0)
1478                         break;
1479                 if (!*++c1) {
1480                         switch (state1) {
1481                         case fnc_DIR:
1482                                 state1 = fnc_SLASH;
1483                                 c1 = (uchar*)"/";
1484                                 break;
1485                         case fnc_SLASH:
1486                                 state1 = fnc_BASE;
1487                                 c1 = (uchar*)f1->basename;
1488                                 break;
1489                         case fnc_BASE:
1490                                 break;
1491                         }
1492                 }
1493                 if (!*++c2) {
1494                         switch (state2) {
1495                         case fnc_DIR:
1496                                 state2 = fnc_SLASH;
1497                                 c2 = (uchar*)"/";
1498                                 break;
1499                         case fnc_SLASH:
1500                                 state2 = fnc_BASE;
1501                                 c2 = (uchar*)f2->basename;
1502                                 break;
1503                         case fnc_BASE:
1504                                 if (!*c1)
1505                                         return 0;
1506                                 break;
1507                         }
1508                 }
1509         }
1510
1511         return dif;
1512 }
1513
1514
1515 /* Return a copy of the full filename of a flist entry, using the indicated
1516  * buffer.  No size-checking is done because we checked the size when creating
1517  * the file_struct entry.
1518  */
1519 char *f_name_to(struct file_struct *f, char *fbuf)
1520 {
1521         if (!f || !f->basename)
1522                 return NULL;
1523
1524         if (f->dirname) {
1525                 int len = strlen(f->dirname);
1526                 memcpy(fbuf, f->dirname, len);
1527                 fbuf[len] = '/';
1528                 strcpy(fbuf + len + 1, f->basename);
1529         } else
1530                 strcpy(fbuf, f->basename);
1531         return fbuf;
1532 }
1533
1534
1535 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1536  */
1537 char *f_name(struct file_struct *f)
1538 {
1539         static char names[5][MAXPATHLEN];
1540         static unsigned int n;
1541
1542         n = (n + 1) % (sizeof names / sizeof names[0]);
1543
1544         return f_name_to(f, names[n]);
1545 }