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         filesystem_dev = st.st_dev;
 297 }
 298
 299
 300 static int to_wire_mode(mode_t mode)
 301 {
 302         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 303                 return (mode & ~(_S_IFMT)) | 0120000;
 304         return (int) mode;
 305 }
 306
 307 static mode_t from_wire_mode(int mode)
 308 {
 309         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 310                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 311         return (mode_t) mode;
 312 }
 313
 314
 315 static void send_directory(int f, struct file_list *flist, char *dir);
 316
 317 static char *flist_dir;
 318 static int flist_dir_len;
 319
 320
 321 /**
 322  * Make sure @p flist is big enough to hold at least @p flist->count
 323  * entries.
 324  **/
 325 static void flist_expand(struct file_list *flist)
 326 {
 327         if (flist->count >= flist->malloced) {
 328                 void *new_ptr;
 329
 330                 if (flist->malloced < 1000)
 331                         flist->malloced += 1000;
 332                 else
 333                         flist->malloced *= 2;
 334
 335                 if (flist->files) {
 336                         new_ptr = realloc_array(flist->files,
 337                                                 struct file_struct *,
 338                                                 flist->malloced);
 339                 } else {
 340                         new_ptr = new_array(struct file_struct *,
 341                                             flist->malloced);
 342                 }
 343
 344                 if (verbose >= 2) {
 345                         rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 346                                 who_am_i(),
 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 |= XMIT_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 to simplify the test
 399                                          * when writing the data. */
 400                                         flags |= XMIT_SAME_RDEV_pre28
 401                                                | XMIT_SAME_HIGH_RDEV;
 402                                 } else
 403                                         rdev = file->u.rdev;
 404                         } else
 405                                 rdev = 0;
 406                 } else if (IS_DEVICE(mode)) {
 407                         if ((file->u.rdev & ~0xFF) == rdev)
 408                                 flags |= XMIT_SAME_HIGH_RDEV;
 409                         else
 410                                 rdev = file->u.rdev & ~0xFF;
 411                 }
 412         }
 413         if (file->uid == uid)
 414                 flags |= XMIT_SAME_UID;
 415         else
 416                 uid = file->uid;
 417         if (file->gid == gid)
 418                 flags |= XMIT_SAME_GID;
 419         else
 420                 gid = file->gid;
 421         if (file->modtime == modtime)
 422                 flags |= XMIT_SAME_TIME;
 423         else
 424                 modtime = file->modtime;
 425         if (file->link_u.idev) {
 426                 if (file->F_DEV == dev) {
 427                         if (protocol_version >= 28)
 428                                 flags |= XMIT_SAME_DEV;
 429                 } else
 430                         dev = file->F_DEV;
 431                 flags |= XMIT_HAS_IDEV_DATA;
 432         }
 433
 434         for (l1 = 0;
 435              lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 436              l1++) {}
 437         l2 = strlen(fname+l1);
 438
 439         if (l1 > 0)
 440                 flags |= XMIT_SAME_NAME;
 441         if (l2 > 255)
 442                 flags |= XMIT_LONG_NAME;
 443
 444         /* We must make sure we don't send a zero flags byte or
 445          * the other end will terminate the flist transfer. */
 446         if (flags == 0 && !S_ISDIR(mode))
 447                 flags |= XMIT_TOP_DIR; /* NOTE: no meaning for non-dir */
 448         if (protocol_version >= 28) {
 449                 if ((flags & 0xFF00) || flags == 0) {
 450                         flags |= XMIT_EXTENDED_FLAGS;
 451                         write_byte(f, flags);
 452                         write_byte(f, flags >> 8);
 453                 } else
 454                         write_byte(f, flags);
 455         } else {
 456                 if (flags == 0)
 457                         flags |= XMIT_LONG_NAME;
 458                 write_byte(f, flags);
 459         }
 460         if (flags & XMIT_SAME_NAME)
 461                 write_byte(f, l1);
 462         if (flags & XMIT_LONG_NAME)
 463                 write_int(f, l2);
 464         else
 465                 write_byte(f, l2);
 466         write_buf(f, fname + l1, l2);
 467
 468         write_longint(f, file->length);
 469         if (!(flags & XMIT_SAME_TIME))
 470                 write_int(f, modtime);
 471         if (!(flags & XMIT_SAME_MODE))
 472                 write_int(f, to_wire_mode(mode));
 473         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 474                 add_uid(uid);
 475                 write_int(f, uid);
 476         }
 477         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 478                 add_gid(gid);
 479                 write_int(f, gid);
 480         }
 481         if (preserve_devices && IS_DEVICE(mode)) {
 482                 /* If XMIT_SAME_HIGH_RDEV is off, XMIT_SAME_RDEV_pre28 is
 483                  * also off.  Also, avoid using "rdev" because it may be
 484                  * incomplete. */
 485                 if (!(flags & XMIT_SAME_HIGH_RDEV))
 486                         write_int(f, file->u.rdev);
 487                 else if (protocol_version >= 28)
 488                         write_byte(f, file->u.rdev);
 489         }
 490
 491 #if SUPPORT_LINKS
 492         if (preserve_links && S_ISLNK(mode)) {
 493                 write_int(f, strlen(file->u.link));
 494                 write_buf(f, file->u.link, strlen(file->u.link));
 495         }
 496 #endif
 497
 498 #if SUPPORT_HARD_LINKS
 499         if (flags & XMIT_HAS_IDEV_DATA) {
 500                 if (protocol_version < 26) {
 501                         /* 32-bit dev_t and ino_t */
 502                         write_int(f, dev);
 503                         write_int(f, file->F_INODE);
 504                 } else {
 505                         /* 64-bit dev_t and ino_t */
 506                         if (!(flags & XMIT_SAME_DEV))
 507                                 write_longint(f, dev);
 508                         write_longint(f, file->F_INODE);
 509                 }
 510         }
 511 #endif
 512
 513         if (always_checksum) {
 514                 char *sum;
 515                 if (S_ISREG(mode))
 516                         sum = file->u.sum;
 517                 else if (protocol_version < 28) {
 518                         /* Prior to 28, we sent a useless set of nulls. */
 519                         sum = empty_sum;
 520                 } else
 521                         sum = NULL;
 522                 if (sum) {
 523                         write_buf(f, sum, protocol_version < 21? 2
 524                                                         : MD4_SUM_LENGTH);
 525                 }
 526         }
 527
 528         strlcpy(lastname, fname, MAXPATHLEN);
 529
 530         io_write_phase = "unknown";
 531 }
 532
 533
 534
 535 void receive_file_entry(struct file_struct **fptr, unsigned short flags, int f)
 536 {
 537         static time_t modtime;
 538         static mode_t mode;
 539         static DEV64_T rdev;    /* just high bytes in p28 onward */
 540         static DEV64_T dev;
 541         static uid_t uid;
 542         static gid_t gid;
 543         static char lastname[MAXPATHLEN];
 544         char thisname[MAXPATHLEN];
 545         unsigned int l1 = 0, l2 = 0;
 546         char *p;
 547         struct file_struct *file;
 548
 549         if (!fptr) {
 550                 modtime = 0, mode = 0;
 551                 rdev = 0, dev = 0;
 552                 uid = 0, gid = 0;
 553                 *lastname = '\0';
 554                 return;
 555         }
 556
 557         if (flags & XMIT_SAME_NAME)
 558                 l1 = read_byte(f);
 559
 560         if (flags & XMIT_LONG_NAME)
 561                 l2 = read_int(f);
 562         else
 563                 l2 = read_byte(f);
 564
 565         file = new(struct file_struct);
 566         if (!file)
 567                 out_of_memory("receive_file_entry");
 568         memset((char *) file, 0, sizeof(*file));
 569         (*fptr) = file;
 570
 571         if (l2 >= MAXPATHLEN - l1) {
 572                 rprintf(FERROR,
 573                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 574                         flags, l1, l2, lastname);
 575                 overflow("receive_file_entry");
 576         }
 577
 578         strlcpy(thisname, lastname, l1 + 1);
 579         read_sbuf(f, &thisname[l1], l2);
 580         thisname[l1 + l2] = 0;
 581
 582         strlcpy(lastname, thisname, MAXPATHLEN);
 583         lastname[MAXPATHLEN - 1] = 0;
 584
 585         clean_fname(thisname);
 586
 587         if (sanitize_paths) {
 588                 sanitize_path(thisname, NULL);
 589         }
 590
 591         if ((p = strrchr(thisname, '/'))) {
 592                 static char *lastdir;
 593                 *p = 0;
 594                 if (lastdir && strcmp(thisname, lastdir) == 0)
 595                         file->dirname = lastdir;
 596                 else {
 597                         file->dirname = strdup(thisname);
 598                         lastdir = file->dirname;
 599                 }
 600                 file->basename = strdup(p + 1);
 601         } else {
 602                 file->dirname = NULL;
 603                 file->basename = strdup(thisname);
 604         }
 605
 606         if (!file->basename)
 607                 out_of_memory("receive_file_entry 1");
 608
 609         file->flags = flags & XMIT_TOP_DIR ? FLAG_TOP_DIR : 0;
 610         file->length = read_longint(f);
 611         if (!(flags & XMIT_SAME_TIME))
 612                 modtime = (time_t)read_int(f);
 613         file->modtime = modtime;
 614         if (!(flags & XMIT_SAME_MODE))
 615                 mode = from_wire_mode(read_int(f));
 616         file->mode = mode;
 617
 618         if (preserve_uid) {
 619                 if (!(flags & XMIT_SAME_UID))
 620                         uid = (uid_t)read_int(f);
 621                 file->uid = uid;
 622         }
 623         if (preserve_gid) {
 624                 if (!(flags & XMIT_SAME_GID))
 625                         gid = (gid_t)read_int(f);
 626                 file->gid = gid;
 627         }
 628         if (preserve_devices) {
 629                 if (protocol_version < 28) {
 630                         if (IS_DEVICE(mode)) {
 631                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 632                                         rdev = (DEV64_T)read_int(f);
 633                                 file->u.rdev = rdev;
 634                         } else
 635                                 rdev = 0;
 636                 } else if (IS_DEVICE(mode)) {
 637                         if (!(flags & XMIT_SAME_HIGH_RDEV)) {
 638                                 file->u.rdev = (DEV64_T)read_int(f);
 639                                 rdev = file->u.rdev & ~0xFF;
 640                         } else
 641                                 file->u.rdev = rdev | (DEV64_T)read_byte(f);
 642                 }
 643         }
 644
 645         if (preserve_links && S_ISLNK(mode)) {
 646                 int l = read_int(f);
 647                 if (l < 0) {
 648                         rprintf(FERROR, "overflow: l=%d\n", l);
 649                         overflow("receive_file_entry");
 650                 }
 651                 if (!(file->u.link = new_array(char, l + 1)))
 652                         out_of_memory("receive_file_entry 2");
 653                 read_sbuf(f, file->u.link, l);
 654                 if (sanitize_paths)
 655                         sanitize_path(file->u.link, file->dirname);
 656         }
 657 #if SUPPORT_HARD_LINKS
 658         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 659                 flags |= XMIT_HAS_IDEV_DATA;
 660         if (flags & XMIT_HAS_IDEV_DATA) {
 661                 if (!(file->link_u.idev = new(struct idev)))
 662                         out_of_memory("file inode data");
 663                 if (protocol_version < 26) {
 664                         dev = read_int(f);
 665                         file->F_INODE = read_int(f);
 666                 } else {
 667                         if (!(flags & XMIT_SAME_DEV))
 668                                 dev = read_longint(f);
 669                         file->F_INODE = read_longint(f);
 670                 }
 671                 file->F_DEV = dev;
 672         }
 673 #endif
 674
 675         if (always_checksum) {
 676                 char *sum;
 677                 if (S_ISREG(mode)) {
 678                         sum = file->u.sum = new_array(char, MD4_SUM_LENGTH);
 679                         if (!sum)
 680                                 out_of_memory("md4 sum");
 681                 } else if (protocol_version < 28) {
 682                         /* Prior to 28, we get a useless set of nulls. */
 683                         sum = empty_sum;
 684                 } else
 685                         sum = NULL;
 686                 if (sum) {
 687                         read_buf(f, sum, protocol_version < 21? 2
 688                                                 : MD4_SUM_LENGTH);
 689                 }
 690         }
 691
 692         if (!preserve_perms) {
 693                 extern int orig_umask;
 694                 /* set an appropriate set of permissions based on original
 695                  * permissions and umask. This emulates what GNU cp does */
 696                 file->mode &= ~orig_umask;
 697         }
 698 }
 699
 700
 701 #define STRDUP(ap, p)   (ap ? string_area_strdup(ap, p) : strdup(p))
 702 /* IRIX cc cares that the operands to the ternary have the same type. */
 703 #define MALLOC(ap, i)   (ap ? (void*) string_area_malloc(ap, i) : malloc(i))
 704
 705 /**
 706  * Create a file_struct for a named file by reading its stat()
 707  * information and performing extensive checks against global
 708  * options.
 709  *
 710  * @return the new file, or NULL if there was an error or this file
 711  * should be excluded.
 712  *
 713  * @todo There is a small optimization opportunity here to avoid
 714  * stat()ing the file in some circumstances, which has a certain cost.
 715  * We are called immediately after doing readdir(), and so we may
 716  * already know the d_type of the file.  We could for example avoid
 717  * statting directories if we're not recursing, but this is not a very
 718  * important case.  Some systems may not have d_type.
 719  **/
 720 struct file_struct *make_file(char *fname, struct string_area **ap,
 721                               int exclude_level)
 722 {
 723         struct file_struct *file;
 724         STRUCT_STAT st;
 725         char sum[SUM_LENGTH];
 726         char *p;
 727         char thisname[MAXPATHLEN];
 728         char linkname[MAXPATHLEN];
 729         unsigned short flags = 0;
 730
 731         if (strlcpy(thisname, fname, sizeof thisname)
 732             >= sizeof thisname - flist_dir_len) {
 733                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 734                 return NULL;
 735         }
 736         clean_fname(thisname);
 737         if (sanitize_paths)
 738                 sanitize_path(thisname, NULL);
 739
 740         memset(sum, 0, SUM_LENGTH);
 741
 742         if (readlink_stat(thisname, &st, linkname) != 0) {
 743                 int save_errno = errno;
 744                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
 745                         /* either symlink pointing nowhere or file that
 746                          * was removed during rsync run; see if excluded
 747                          * before reporting an error */
 748                         if (check_exclude_file(thisname, 0, exclude_level)) {
 749                                 /* file is excluded anyway, ignore silently */
 750                                 return NULL;
 751                         }
 752                 }
 753                 io_error |= IOERR_GENERAL;
 754                 rprintf(FERROR, "readlink %s failed: %s\n",
 755                         full_fname(thisname), strerror(save_errno));
 756                 return NULL;
 757         }
 758
 759         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 760         if (exclude_level == NO_EXCLUDES)
 761                 goto skip_excludes;
 762
 763         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 764                 rprintf(FINFO, "skipping directory %s\n", thisname);
 765                 return NULL;
 766         }
 767
 768         if (one_file_system && st.st_dev != filesystem_dev) {
 769                 /* We allow a directory though to preserve the mount point.
 770                  * However, flag it so that we don't recurse. */
 771                 if (!S_ISDIR(st.st_mode))
 772                         return NULL;
 773                 flags |= FLAG_MOUNT_POINT;
 774         }
 775
 776         if (check_exclude_file(thisname, S_ISDIR(st.st_mode) != 0, exclude_level))
 777                 return NULL;
 778
 779         if (lp_ignore_nonreadable(module_id) && access(thisname, R_OK) != 0)
 780                 return NULL;
 781
 782       skip_excludes:
 783
 784         if (verbose > 2) {
 785                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 786                         who_am_i(), thisname, exclude_level);
 787         }
 788
 789         file = new(struct file_struct);
 790         if (!file)
 791                 out_of_memory("make_file");
 792         memset((char *) file, 0, sizeof(*file));
 793         file->flags = flags;
 794
 795         if ((p = strrchr(thisname, '/'))) {
 796                 static char *lastdir;
 797                 *p = 0;
 798                 if (lastdir && strcmp(thisname, lastdir) == 0)
 799                         file->dirname = lastdir;
 800                 else {
 801                         file->dirname = strdup(thisname);
 802                         lastdir = file->dirname;
 803                 }
 804                 file->basename = STRDUP(ap, p + 1);
 805                 *p = '/';
 806         } else {
 807                 file->dirname = NULL;
 808                 file->basename = STRDUP(ap, thisname);
 809         }
 810
 811         file->modtime = st.st_mtime;
 812         file->length = st.st_size;
 813         file->mode = st.st_mode;
 814         file->uid = st.st_uid;
 815         file->gid = st.st_gid;
 816         if (preserve_hard_links) {
 817                 if (protocol_version < 28 ? S_ISREG(st.st_mode)
 818                     : !S_ISDIR(st.st_mode) && st.st_nlink > 1) {
 819                         if (!(file->link_u.idev = new(struct idev)))
 820                                 out_of_memory("file inode data");
 821                         file->F_DEV = st.st_dev;
 822                         file->F_INODE = st.st_ino;
 823                 }
 824         }
 825 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 826         if (IS_DEVICE(st.st_mode))
 827                 file->u.rdev = st.st_rdev;
 828 #endif
 829
 830 #if SUPPORT_LINKS
 831         if (S_ISLNK(st.st_mode))
 832                 file->u.link = STRDUP(ap, linkname);
 833 #endif
 834
 835         if (always_checksum && S_ISREG(st.st_mode)) {
 836                 if (!(file->u.sum = (char*)MALLOC(ap, MD4_SUM_LENGTH)))
 837                         out_of_memory("md4 sum");
 838                 file_checksum(thisname, file->u.sum, st.st_size);
 839         }
 840
 841         file->basedir = flist_dir;
 842
 843         if (!S_ISDIR(st.st_mode))
 844                 stats.total_size += st.st_size;
 845
 846         return file;
 847 }
 848
 849
 850 void send_file_name(int f, struct file_list *flist, char *fname,
 851                     int recursive, unsigned short base_flags)
 852 {
 853         struct file_struct *file;
 854         char fbuf[MAXPATHLEN];
 855         extern int delete_excluded;
 856
 857         /* f is set to -1 when calculating deletion file list */
 858         file = make_file(fname, &flist->string_area,
 859                          f == -1 && delete_excluded? SERVER_EXCLUDES
 860                                                    : ALL_EXCLUDES);
 861
 862         if (!file)
 863                 return;
 864
 865         maybe_emit_filelist_progress(flist);
 866
 867         flist_expand(flist);
 868
 869         if (write_batch)
 870                 file->flags |= FLAG_TOP_DIR;
 871
 872         if (file->basename[0]) {
 873                 flist->files[flist->count++] = file;
 874                 send_file_entry(file, f, base_flags);
 875         }
 876
 877         if (recursive && S_ISDIR(file->mode)
 878             && !(file->flags & FLAG_MOUNT_POINT)) {
 879                 struct exclude_struct **last_exclude_list = local_exclude_list;
 880                 send_directory(f, flist, f_name_to(file, fbuf));
 881                 local_exclude_list = last_exclude_list;
 882                 return;
 883         }
 884 }
 885
 886
 887 static void send_directory(int f, struct file_list *flist, char *dir)
 888 {
 889         DIR *d;
 890         struct dirent *di;
 891         char fname[MAXPATHLEN];
 892         unsigned int offset;
 893         char *p;
 894
 895         d = opendir(dir);
 896         if (!d) {
 897                 io_error |= IOERR_GENERAL;
 898                 rprintf(FERROR, "opendir %s failed: %s\n",
 899                         full_fname(dir), strerror(errno));
 900                 return;
 901         }
 902
 903         offset = strlcpy(fname, dir, MAXPATHLEN);
 904         p = fname + offset;
 905         if (offset >= MAXPATHLEN || p[-1] != '/') {
 906                 if (offset >= MAXPATHLEN - 1) {
 907                         io_error |= IOERR_GENERAL;
 908                         rprintf(FERROR, "skipping long-named directory: %s\n",
 909                                 full_fname(fname));
 910                         closedir(d);
 911                         return;
 912                 }
 913                 *p++ = '/';
 914                 offset++;
 915         }
 916
 917         local_exclude_list = NULL;
 918
 919         if (cvs_exclude) {
 920                 if (strlcpy(p, ".cvsignore", MAXPATHLEN - offset)
 921                     < MAXPATHLEN - offset)
 922                         add_exclude_file(&local_exclude_list,fname,MISSING_OK,ADD_EXCLUDE);
 923                 else {
 924                         io_error |= IOERR_GENERAL;
 925                         rprintf(FINFO,
 926                                 "cannot cvs-exclude in long-named directory %s\n",
 927                                 full_fname(fname));
 928                 }
 929         }
 930
 931         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 932                 char *dname = d_name(di);
 933                 if (dname[0] == '.' && (dname[1] == '\0'
 934                     || (dname[1] == '.' && dname[2] == '\0')))
 935                         continue;
 936                 if (strlcpy(p, dname, MAXPATHLEN - offset) < MAXPATHLEN - offset)
 937                         send_file_name(f, flist, fname, recurse, 0);
 938                 else {
 939                         io_error |= IOERR_GENERAL;
 940                         rprintf(FINFO,
 941                                 "cannot send long-named file %s\n",
 942                                 full_fname(fname));
 943                 }
 944         }
 945         if (errno) {
 946                 io_error |= IOERR_GENERAL;
 947                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
 948                         dir, errno, strerror(errno));
 949         }
 950
 951         if (local_exclude_list)
 952                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
 953
 954         closedir(d);
 955 }
 956
 957
 958 /**
 959  * The delete_files() function in receiver.c sets f to -1 so that we just
 960  * construct the file list in memory without sending it over the wire.  It
 961  * also has the side-effect of ignoring user-excludes if delete_excluded
 962  * is set (so that the delete list includes user-excluded files).
 963  **/
 964 struct file_list *send_file_list(int f, int argc, char *argv[])
 965 {
 966         int l;
 967         STRUCT_STAT st;
 968         char *p, *dir, olddir[sizeof curr_dir];
 969         char lastpath[MAXPATHLEN] = "";
 970         struct file_list *flist;
 971         int64 start_write;
 972         int use_ff_fd = 0;
 973
 974         if (show_filelist_p() && f != -1)
 975                 start_filelist_progress("building file list");
 976
 977         start_write = stats.total_written;
 978
 979         flist = flist_new();
 980
 981         if (f != -1) {
 982                 io_start_buffering_out(f);
 983                 if (filesfrom_fd >= 0) {
 984                         if (argv[0] && !push_dir(argv[0])) {
 985                                 rprintf(FERROR, "push_dir %s failed: %s\n",
 986                                         full_fname(argv[0]), strerror(errno));
 987                                 exit_cleanup(RERR_FILESELECT);
 988                         }
 989                         use_ff_fd = 1;
 990                 }
 991         }
 992
 993         while (1) {
 994                 char fname2[MAXPATHLEN];
 995                 char *fname = fname2;
 996
 997                 if (use_ff_fd) {
 998                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
 999                                 break;
1000                         sanitize_path(fname, NULL);
1001                 } else {
1002                         if (argc-- == 0)
1003                                 break;
1004                         strlcpy(fname, *argv++, MAXPATHLEN);
1005                         if (sanitize_paths)
1006                                 sanitize_path(fname, NULL);
1007                 }
1008
1009                 l = strlen(fname);
1010                 if (fname[l - 1] == '/') {
1011                         if (l == 2 && fname[0] == '.') {
1012                                 /* Turn "./" into just "." rather than "./." */
1013                                 fname[1] = '\0';
1014                         } else if (l < MAXPATHLEN) {
1015                                 fname[l++] = '.';
1016                                 fname[l] = '\0';
1017                         }
1018                 }
1019
1020                 if (link_stat(fname, &st) != 0) {
1021                         if (f != -1) {
1022                                 io_error |= IOERR_GENERAL;
1023                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1024                                         full_fname(fname), strerror(errno));
1025                         }
1026                         continue;
1027                 }
1028
1029                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1030                         rprintf(FINFO, "skipping directory %s\n", fname);
1031                         continue;
1032                 }
1033
1034                 dir = NULL;
1035                 olddir[0] = '\0';
1036
1037                 if (!relative_paths) {
1038                         p = strrchr(fname, '/');
1039                         if (p) {
1040                                 *p = 0;
1041                                 if (p == fname)
1042                                         dir = "/";
1043                                 else
1044                                         dir = fname;
1045                                 fname = p + 1;
1046                         }
1047                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1048                         /* this ensures we send the intermediate directories,
1049                            thus getting their permissions right */
1050                         char *lp = lastpath, *fn = fname, *slash = fname;
1051                         *p = 0;
1052                         /* Skip any initial directories in our path that we
1053                          * have in common with lastpath. */
1054                         while (*fn && *lp == *fn) {
1055                                 if (*fn == '/')
1056                                         slash = fn;
1057                                 lp++, fn++;
1058                         }
1059                         *p = '/';
1060                         if (fn != p || (*lp && *lp != '/')) {
1061                                 int copy_links_saved = copy_links;
1062                                 int recurse_saved = recurse;
1063                                 copy_links = copy_unsafe_links;
1064                                 /* set recurse to 1 to prevent make_file
1065                                  * from ignoring directory, but still
1066                                  * turn off the recursive parameter to
1067                                  * send_file_name */
1068                                 recurse = 1;
1069                                 while ((slash = strchr(slash+1, '/')) != 0) {
1070                                         *slash = 0;
1071                                         send_file_name(f, flist, fname, 0, 0);
1072                                         *slash = '/';
1073                                 }
1074                                 copy_links = copy_links_saved;
1075                                 recurse = recurse_saved;
1076                                 *p = 0;
1077                                 strlcpy(lastpath, fname, sizeof lastpath);
1078                                 *p = '/';
1079                         }
1080                 }
1081
1082                 if (!*fname)
1083                         fname = ".";
1084
1085                 if (dir && *dir) {
1086                         static char *lastdir;
1087                         static int lastdir_len;
1088
1089                         strcpy(olddir, curr_dir); /* can't overflow */
1090
1091                         if (!push_dir(dir)) {
1092                                 io_error |= IOERR_GENERAL;
1093                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1094                                         full_fname(dir), strerror(errno));
1095                                 continue;
1096                         }
1097
1098                         if (lastdir && strcmp(lastdir, dir) == 0) {
1099                                 flist_dir = lastdir;
1100                                 flist_dir_len = lastdir_len;
1101                         } else {
1102                                 flist_dir = lastdir = strdup(dir);
1103                                 flist_dir_len = lastdir_len = strlen(dir);
1104                         }
1105                 }
1106
1107                 if (one_file_system)
1108                         set_filesystem(fname);
1109
1110                 send_file_name(f, flist, fname, recurse, XMIT_TOP_DIR);
1111
1112                 if (olddir[0]) {
1113                         flist_dir = NULL;
1114                         flist_dir_len = 0;
1115                         if (!pop_dir(olddir)) {
1116                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1117                                         full_fname(dir), strerror(errno));
1118                                 exit_cleanup(RERR_FILESELECT);
1119                         }
1120                 }
1121         }
1122
1123         if (f != -1) {
1124                 send_file_entry(NULL, f, 0);
1125
1126                 if (show_filelist_p())
1127                         finish_filelist_progress(flist);
1128         }
1129
1130         clean_flist(flist, 0, 0);
1131
1132         if (f != -1) {
1133                 /* Now send the uid/gid list. This was introduced in
1134                  * protocol version 15 */
1135                 send_uid_list(f);
1136
1137                 /* send the io_error flag */
1138                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1139
1140                 io_end_buffering();
1141                 stats.flist_size = stats.total_written - start_write;
1142                 stats.num_files = flist->count;
1143                 if (write_batch)
1144                         write_batch_flist_info(flist->count, flist->files);
1145         }
1146
1147         if (verbose > 2)
1148                 rprintf(FINFO, "send_file_list done\n");
1149
1150         return flist;
1151 }
1152
1153
1154 struct file_list *recv_file_list(int f)
1155 {
1156         struct file_list *flist;
1157         unsigned short flags;
1158         int64 start_read;
1159         extern int list_only;
1160
1161         if (show_filelist_p())
1162                 start_filelist_progress("receiving file list");
1163
1164         start_read = stats.total_read;
1165
1166         flist = new(struct file_list);
1167         if (!flist)
1168                 goto oom;
1169
1170         flist->count = 0;
1171         flist->malloced = 1000;
1172         flist->files = new_array(struct file_struct *, flist->malloced);
1173         if (!flist->files)
1174                 goto oom;
1175
1176
1177         while ((flags = read_byte(f)) != 0) {
1178                 int i = flist->count;
1179
1180                 flist_expand(flist);
1181
1182                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1183                         flags |= read_byte(f) << 8;
1184                 receive_file_entry(&flist->files[i], flags, f);
1185
1186                 if (S_ISREG(flist->files[i]->mode))
1187                         stats.total_size += flist->files[i]->length;
1188
1189                 flist->count++;
1190
1191                 maybe_emit_filelist_progress(flist);
1192
1193                 if (verbose > 2) {
1194                         rprintf(FINFO, "recv_file_name(%s)\n",
1195                                 f_name(flist->files[i]));
1196                 }
1197         }
1198         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1199
1200         if (verbose > 2)
1201                 rprintf(FINFO, "received %d names\n", flist->count);
1202
1203         if (show_filelist_p())
1204                 finish_filelist_progress(flist);
1205
1206         clean_flist(flist, relative_paths, 1);
1207
1208         if (f != -1) {
1209                 /* Now send the uid/gid list. This was introduced in
1210                  * protocol version 15 */
1211                 recv_uid_list(f, flist);
1212
1213                 if (!read_batch) {
1214                         /* Recv the io_error flag */
1215                         if (lp_ignore_errors(module_id) || ignore_errors)
1216                                 read_int(f);
1217                         else
1218                                 io_error |= read_int(f);
1219                 }
1220         }
1221
1222         if (list_only) {
1223                 int i;
1224                 for (i = 0; i < flist->count; i++)
1225                         list_file_entry(flist->files[i]);
1226         }
1227
1228         if (verbose > 2)
1229                 rprintf(FINFO, "recv_file_list done\n");
1230
1231         stats.flist_size = stats.total_read - start_read;
1232         stats.num_files = flist->count;
1233
1234         return flist;
1235
1236       oom:
1237         out_of_memory("recv_file_list");
1238         return NULL;            /* not reached */
1239 }
1240
1241
1242 int file_compare(struct file_struct **file1, struct file_struct **file2)
1243 {
1244         struct file_struct *f1 = *file1;
1245         struct file_struct *f2 = *file2;
1246
1247         if (!f1->basename && !f2->basename)
1248                 return 0;
1249         if (!f1->basename)
1250                 return -1;
1251         if (!f2->basename)
1252                 return 1;
1253         if (f1->dirname == f2->dirname)
1254                 return u_strcmp(f1->basename, f2->basename);
1255         return f_name_cmp(f1, f2);
1256 }
1257
1258
1259 int flist_find(struct file_list *flist, struct file_struct *f)
1260 {
1261         int low = 0, high = flist->count - 1;
1262
1263         while (high >= 0 && !flist->files[high]->basename) high--;
1264
1265         if (high < 0)
1266                 return -1;
1267
1268         while (low != high) {
1269                 int mid = (low + high) / 2;
1270                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1271                 if (ret == 0)
1272                         return flist_up(flist, mid);
1273                 if (ret > 0)
1274                         high = mid;
1275                 else
1276                         low = mid + 1;
1277         }
1278
1279         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1280                 return flist_up(flist, low);
1281         return -1;
1282 }
1283
1284
1285 /*
1286  * free up one file
1287  */
1288 void free_file(struct file_struct *file)
1289 {
1290         if (!file)
1291                 return;
1292         if (file->basename)
1293                 free(file->basename);
1294         if (!IS_DEVICE(file->mode) && file->u.link)
1295                 free(file->u.link); /* Handles u.sum too. */
1296         if (file->link_u.idev)
1297                 free((char*)file->link_u.idev); /* Handles link_u.links too. */
1298         *file = null_file;
1299 }
1300
1301
1302 /*
1303  * allocate a new file list
1304  */
1305 struct file_list *flist_new(void)
1306 {
1307         struct file_list *flist;
1308
1309         flist = new(struct file_list);
1310         if (!flist)
1311                 out_of_memory("send_file_list");
1312
1313         flist->count = 0;
1314         flist->malloced = 0;
1315         flist->files = NULL;
1316
1317 #if ARENA_SIZE > 0
1318         flist->string_area = string_area_new(0);
1319 #else
1320         flist->string_area = NULL;
1321 #endif
1322         return flist;
1323 }
1324
1325 /*
1326  * free up all elements in a flist
1327  */
1328 void flist_free(struct file_list *flist)
1329 {
1330         int i;
1331         for (i = 1; i < flist->count; i++) {
1332                 if (!flist->string_area)
1333                         free_file(flist->files[i]);
1334                 free(flist->files[i]);
1335         }
1336         /* FIXME: I don't think we generally need to blank the flist
1337          * since it's about to be freed.  This will just cause more
1338          * memory traffic.  If you want a freed-memory debugger, you
1339          * know where to get it. */
1340         memset((char *) flist->files, 0,
1341                sizeof(flist->files[0]) * flist->count);
1342         free(flist->files);
1343         if (flist->string_area)
1344                 string_area_free(flist->string_area);
1345         memset((char *) flist, 0, sizeof(*flist));
1346         free(flist);
1347 }
1348
1349
1350 /*
1351  * This routine ensures we don't have any duplicate names in our file list.
1352  * duplicate names can cause corruption because of the pipelining
1353  */
1354 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1355 {
1356         int i, prev_i = 0;
1357
1358         if (!flist || flist->count == 0)
1359                 return;
1360
1361         qsort(flist->files, flist->count,
1362               sizeof(flist->files[0]), (int (*)()) file_compare);
1363
1364         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1365                 if (flist->files[i]->basename) {
1366                         prev_i = i;
1367                         break;
1368                 }
1369         }
1370         while (++i < flist->count) {
1371                 if (!flist->files[i]->basename)
1372                         continue;
1373                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1374                         if (verbose > 1 && !am_server) {
1375                                 rprintf(FINFO,
1376                                         "removing duplicate name %s from file list %d\n",
1377                                         f_name(flist->files[i]), i);
1378                         }
1379                         /* Make sure that if we unduplicate '.', that we don't
1380                          * lose track of a user-specified starting point (or
1381                          * else deletions will mysteriously fail with -R). */
1382                         if (flist->files[i]->flags & FLAG_TOP_DIR)
1383                                 flist->files[prev_i]->flags |= FLAG_TOP_DIR;
1384                         /* it's not great that the flist knows the semantics of
1385                          * the file memory usage, but i'd rather not add a flag
1386                          * byte to that struct.
1387                          * XXX can i use a bit in the flags field? */
1388                         if (flist->string_area)
1389                                 flist->files[i][0] = null_file;
1390                         else
1391                                 free_file(flist->files[i]);
1392                 } else
1393                         prev_i = i;
1394         }
1395
1396         if (strip_root) {
1397                 /* we need to strip off the root directory in the case
1398                    of relative paths, but this must be done _after_
1399                    the sorting phase */
1400                 for (i = 0; i < flist->count; i++) {
1401                         if (flist->files[i]->dirname &&
1402                             flist->files[i]->dirname[0] == '/') {
1403                                 memmove(&flist->files[i]->dirname[0],
1404                                         &flist->files[i]->dirname[1],
1405                                         strlen(flist->files[i]->dirname));
1406                         }
1407
1408                         if (flist->files[i]->dirname &&
1409                             !flist->files[i]->dirname[0]) {
1410                                 flist->files[i]->dirname = NULL;
1411                         }
1412                 }
1413         }
1414
1415         if (verbose <= 3)
1416                 return;
1417
1418         for (i = 0; i < flist->count; i++) {
1419                 rprintf(FINFO, "[%s] i=%d %s %s %s mode=0%o len=%.0f\n",
1420                         who_am_i(), i,
1421                         NS(flist->files[i]->basedir),
1422                         NS(flist->files[i]->dirname),
1423                         NS(flist->files[i]->basename),
1424                         (int) flist->files[i]->mode,
1425                         (double) flist->files[i]->length);
1426         }
1427 }
1428
1429
1430 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1431
1432 /* Compare the names of two file_struct entities, just like strcmp()
1433  * would do if it were operating on the joined strings.  We assume
1434  * that there are no 0-length strings.
1435  */
1436 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1437 {
1438         int dif;
1439         const uchar *c1, *c2;
1440         enum fnc_state state1, state2;
1441
1442         if (!f1 || !f1->basename) {
1443                 if (!f2 || !f2->basename)
1444                         return 0;
1445                 return -1;
1446         }
1447         if (!f2 || !f2->basename)
1448                 return 1;
1449
1450         if (!(c1 = (uchar*)f1->dirname)) {
1451                 state1 = fnc_BASE;
1452                 c1 = (uchar*)f1->basename;
1453         } else
1454                 state1 = fnc_DIR;
1455         if (!(c2 = (uchar*)f2->dirname)) {
1456                 state2 = fnc_BASE;
1457                 c2 = (uchar*)f2->basename;
1458         } else
1459                 state2 = fnc_DIR;
1460
1461         while (1) {
1462                 if ((dif = (int)*c1 - (int)*c2) != 0)
1463                         break;
1464                 if (!*++c1) {
1465                         switch (state1) {
1466                         case fnc_DIR:
1467                                 state1 = fnc_SLASH;
1468                                 c1 = (uchar*)"/";
1469                                 break;
1470                         case fnc_SLASH:
1471                                 state1 = fnc_BASE;
1472                                 c1 = (uchar*)f1->basename;
1473                                 break;
1474                         case fnc_BASE:
1475                                 break;
1476                         }
1477                 }
1478                 if (!*++c2) {
1479                         switch (state2) {
1480                         case fnc_DIR:
1481                                 state2 = fnc_SLASH;
1482                                 c2 = (uchar*)"/";
1483                                 break;
1484                         case fnc_SLASH:
1485                                 state2 = fnc_BASE;
1486                                 c2 = (uchar*)f2->basename;
1487                                 break;
1488                         case fnc_BASE:
1489                                 if (!*c1)
1490                                         return 0;
1491                                 break;
1492                         }
1493                 }
1494         }
1495
1496         return dif;
1497 }
1498
1499
1500 /* Return a copy of the full filename of a flist entry, using the indicated
1501  * buffer.  No size-checking is done because we checked the size when creating
1502  * the file_struct entry.
1503  */
1504 char *f_name_to(struct file_struct *f, char *fbuf)
1505 {
1506         if (!f || !f->basename)
1507                 return NULL;
1508
1509         if (f->dirname) {
1510                 int len = strlen(f->dirname);
1511                 memcpy(fbuf, f->dirname, len);
1512                 fbuf[len] = '/';
1513                 strcpy(fbuf + len + 1, f->basename);
1514         } else
1515                 strcpy(fbuf, f->basename);
1516         return fbuf;
1517 }
1518
1519
1520 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1521  */
1522 char *f_name(struct file_struct *f)
1523 {
1524         static char names[5][MAXPATHLEN];
1525         static unsigned int n;
1526
1527         n = (n + 1) % (sizeof names / sizeof names[0]);
1528
1529         return f_name_to(f, names[n]);
1530 }