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 *files_from;
  47 extern int filesfrom_fd;
  48
  49 extern int one_file_system;
  50 extern int make_backups;
  51 extern int preserve_links;
  52 extern int preserve_hard_links;
  53 extern int preserve_perms;
  54 extern int preserve_devices;
  55 extern int preserve_uid;
  56 extern int preserve_gid;
  57 extern int preserve_times;
  58 extern int relative_paths;
  59 extern int implied_dirs;
  60 extern int copy_links;
  61 extern int copy_unsafe_links;
  62 extern int protocol_version;
  63 extern int sanitize_paths;
  64
  65 extern int read_batch;
  66 extern int write_batch;
  67
  68 extern struct exclude_struct **exclude_list;
  69 extern struct exclude_struct **server_exclude_list;
  70 extern struct exclude_struct **local_exclude_list;
  71
  72 int io_error;
  73
  74 static struct file_struct null_file;
  75 static char empty_sum[MD4_SUM_LENGTH];
  76
  77 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  78
  79
  80 static int show_filelist_p(void)
  81 {
  82         return verbose && (recurse || files_from) && !am_server;
  83 }
  84
  85 static void start_filelist_progress(char *kind)
  86 {
  87         rprintf(FINFO, "%s ... ", kind);
  88         if ((verbose > 1) || do_progress)
  89                 rprintf(FINFO, "\n");
  90         rflush(FINFO);
  91 }
  92
  93
  94 static void emit_filelist_progress(const struct file_list *flist)
  95 {
  96         rprintf(FINFO, " %d files...\r", flist->count);
  97 }
  98
  99
 100 static void maybe_emit_filelist_progress(const struct file_list *flist)
 101 {
 102         if (do_progress && show_filelist_p() && ((flist->count % 100) == 0))
 103                 emit_filelist_progress(flist);
 104 }
 105
 106
 107 static void finish_filelist_progress(const struct file_list *flist)
 108 {
 109         if (do_progress) {
 110                 /* This overwrites the progress line */
 111                 rprintf(FINFO, "%d file%sto consider\n",
 112                         flist->count, flist->count == 1 ? " " : "s ");
 113         } else
 114                 rprintf(FINFO, "done\n");
 115 }
 116
 117 void show_flist_stats(void)
 118 {
 119         /* Nothing yet */
 120 }
 121
 122
 123 static struct string_area *string_area_new(int size)
 124 {
 125         struct string_area *a;
 126
 127         if (size <= 0)
 128                 size = ARENA_SIZE;
 129         a = new(struct string_area);
 130         if (!a)
 131                 out_of_memory("string_area_new");
 132         a->current = a->base = new_array(char, size);
 133         if (!a->current)
 134                 out_of_memory("string_area_new buffer");
 135         a->end = a->base + size;
 136         a->next = NULL;
 137
 138         return a;
 139 }
 140
 141 static void string_area_free(struct string_area *a)
 142 {
 143         struct string_area *next;
 144
 145         for (; a; a = next) {
 146                 next = a->next;
 147                 free(a->base);
 148         }
 149 }
 150
 151 static char *string_area_malloc(struct string_area **ap, int size)
 152 {
 153         char *p;
 154         struct string_area *a;
 155
 156         /* does the request fit into the current space? */
 157         a = *ap;
 158         if (a->current + size >= a->end) {
 159                 /* no; get space, move new string_area to front of the list */
 160                 a = string_area_new(size > ARENA_SIZE ? size : ARENA_SIZE);
 161                 a->next = *ap;
 162                 *ap = a;
 163         }
 164
 165         /* have space; do the "allocation." */
 166         p = a->current;
 167         a->current += size;
 168         return p;
 169 }
 170
 171 static char *string_area_strdup(struct string_area **ap, const char *src)
 172 {
 173         char *dest = string_area_malloc(ap, strlen(src) + 1);
 174         return strcpy(dest, src);
 175 }
 176
 177 static void list_file_entry(struct file_struct *f)
 178 {
 179         char perms[11];
 180
 181         if (!f->basename)
 182                 /* this can happen if duplicate names were removed */
 183                 return;
 184
 185         permstring(perms, f->mode);
 186
 187         if (preserve_links && S_ISLNK(f->mode)) {
 188                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 189                         perms,
 190                         (double) f->length, timestring(f->modtime),
 191                         f_name(f), f->u.link);
 192         } else {
 193                 rprintf(FINFO, "%s %11.0f %s %s\n",
 194                         perms,
 195                         (double) f->length, timestring(f->modtime),
 196                         f_name(f));
 197         }
 198 }
 199
 200
 201 /**
 202  * Stat either a symlink or its referent, depending on the settings of
 203  * copy_links, copy_unsafe_links, etc.
 204  *
 205  * @retval -1 on error
 206  *
 207  * @retval 0 for success
 208  *
 209  * @post If @p path is a symlink, then @p linkbuf (of size @c
 210  * MAXPATHLEN) contains the symlink target.
 211  *
 212  * @post @p buffer contains information about the link or the
 213  * referrent as appropriate, if they exist.
 214  **/
 215 int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 216 {
 217 #if SUPPORT_LINKS
 218         if (copy_links)
 219                 return do_stat(path, buffer);
 220         if (do_lstat(path, buffer) == -1)
 221                 return -1;
 222         if (S_ISLNK(buffer->st_mode)) {
 223                 int l = readlink((char *) path, linkbuf, MAXPATHLEN - 1);
 224                 if (l == -1)
 225                         return -1;
 226                 linkbuf[l] = 0;
 227                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 228                         if (verbose > 1) {
 229                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 230                                         path, linkbuf);
 231                         }
 232                         return do_stat(path, buffer);
 233                 }
 234         }
 235         return 0;
 236 #else
 237         return do_stat(path, buffer);
 238 #endif
 239 }
 240
 241 int link_stat(const char *path, STRUCT_STAT * buffer)
 242 {
 243 #if SUPPORT_LINKS
 244         if (copy_links)
 245                 return do_stat(path, buffer);
 246         return do_lstat(path, buffer);
 247 #else
 248         return do_stat(path, buffer);
 249 #endif
 250 }
 251
 252 /*
 253  * This function is used to check if a file should be included/excluded
 254  * from the list of files based on its name and type etc.  The value of
 255  * exclude_level is set to either SERVER_EXCLUDES or ALL_EXCLUDES.
 256  */
 257 static int check_exclude_file(char *fname, int is_dir, int exclude_level)
 258 {
 259 #if 0 /* This currently never happens, so avoid a useless compare. */
 260         if (exclude_level == NO_EXCLUDES)
 261                 return 0;
 262 #endif
 263         if (fname) {
 264                 /* never exclude '.', even if somebody does --exclude '*' */
 265                 if (fname[0] == '.' && !fname[1])
 266                         return 0;
 267                 /* Handle the -R version of the '.' dir. */
 268                 if (fname[0] == '/') {
 269                         int len = strlen(fname);
 270                         if (fname[len-1] == '.' && fname[len-2] == '/')
 271                                 return 0;
 272                 }
 273         }
 274         if (server_exclude_list
 275          && check_exclude(server_exclude_list, fname, is_dir))
 276                 return 1;
 277         if (exclude_level != ALL_EXCLUDES)
 278                 return 0;
 279         if (exclude_list && check_exclude(exclude_list, fname, is_dir))
 280                 return 1;
 281         if (local_exclude_list
 282          && check_exclude(local_exclude_list, fname, is_dir))
 283                 return 1;
 284         return 0;
 285 }
 286
 287 /* used by the one_file_system code */
 288 static dev_t filesystem_dev;
 289
 290 static void set_filesystem(char *fname)
 291 {
 292         STRUCT_STAT st;
 293         if (link_stat(fname, &st) != 0)
 294                 return;
 295         filesystem_dev = st.st_dev;
 296 }
 297
 298
 299 static int to_wire_mode(mode_t mode)
 300 {
 301         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 302                 return (mode & ~(_S_IFMT)) | 0120000;
 303         return (int) mode;
 304 }
 305
 306 static mode_t from_wire_mode(int mode)
 307 {
 308         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 309                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 310         return (mode_t) mode;
 311 }
 312
 313
 314 static void send_directory(int f, struct file_list *flist, char *dir);
 315
 316 static char *flist_dir;
 317
 318
 319 /**
 320  * Make sure @p flist is big enough to hold at least @p flist->count
 321  * entries.
 322  **/
 323 static void flist_expand(struct file_list *flist)
 324 {
 325         if (flist->count >= flist->malloced) {
 326                 void *new_ptr;
 327
 328                 if (flist->malloced < 1000)
 329                         flist->malloced += 1000;
 330                 else
 331                         flist->malloced *= 2;
 332
 333                 if (flist->files) {
 334                         new_ptr = realloc_array(flist->files,
 335                                                 struct file_struct *,
 336                                                 flist->malloced);
 337                 } else {
 338                         new_ptr = new_array(struct file_struct *,
 339                                             flist->malloced);
 340                 }
 341
 342                 if (verbose >= 2) {
 343                         rprintf(FINFO, "expand file_list to %.0f bytes, did%s move\n",
 344                                 (double)sizeof(flist->files[0])
 345                                 * flist->malloced,
 346                                 (new_ptr == flist->files) ? " not" : "");
 347                 }
 348
 349                 flist->files = (struct file_struct **) new_ptr;
 350
 351                 if (!flist->files)
 352                         out_of_memory("flist_expand");
 353         }
 354 }
 355
 356 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 357 {
 358         unsigned short flags;
 359         static time_t modtime;
 360         static mode_t mode;
 361         static DEV64_T rdev;    /* just high bytes in p28 onward */
 362         static DEV64_T dev;
 363         static uid_t uid;
 364         static gid_t gid;
 365         static char lastname[MAXPATHLEN];
 366         char *fname, fbuf[MAXPATHLEN];
 367         int l1, l2;
 368
 369         if (f == -1)
 370                 return;
 371
 372         if (!file) {
 373                 write_byte(f, 0);
 374                 modtime = 0, mode = 0;
 375                 rdev = 0, dev = 0;
 376                 uid = 0, gid = 0;
 377                 *lastname = '\0';
 378                 return;
 379         }
 380
 381         io_write_phase = "send_file_entry";
 382
 383         fname = f_name_to(file, fbuf, sizeof fbuf);
 384
 385         flags = base_flags;
 386
 387         if (file->mode == mode)
 388                 flags |= SAME_MODE;
 389         else
 390                 mode = file->mode;
 391         if (preserve_devices) {
 392                 if (protocol_version < 28) {
 393                         if (IS_DEVICE(mode)) {
 394                                 if (file->u.rdev == rdev) {
 395                                         /* Set both flags so that the test when
 396                                          * writing the data is simpler. */
 397                                         flags |= SAME_RDEV_pre28|SAME_HIGH_RDEV;
 398                                 } else
 399                                         rdev = file->u.rdev;
 400                         } else
 401                                 rdev = 0;
 402                 } else if (IS_DEVICE(mode)) {
 403                         if ((file->u.rdev & ~0xFF) == rdev)
 404                                 flags |= SAME_HIGH_RDEV;
 405                         else
 406                                 rdev = file->u.rdev & ~0xFF;
 407                 }
 408         }
 409         if (file->uid == uid)
 410                 flags |= SAME_UID;
 411         else
 412                 uid = file->uid;
 413         if (file->gid == gid)
 414                 flags |= SAME_GID;
 415         else
 416                 gid = file->gid;
 417         if (file->modtime == modtime)
 418                 flags |= SAME_TIME;
 419         else
 420                 modtime = file->modtime;
 421         if (file->link_u.idev) {
 422                 if (file->F_DEV == dev) {
 423                         if (protocol_version >= 28)
 424                                 flags |= SAME_DEV;
 425                 } else
 426                         dev = file->F_DEV;
 427                 flags |= HAS_INODE_DATA;
 428         }
 429
 430         for (l1 = 0;
 431              lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 432              l1++) {}
 433         l2 = strlen(fname) - l1;
 434
 435         if (l1 > 0)
 436                 flags |= SAME_NAME;
 437         if (l2 > 255)
 438                 flags |= LONG_NAME;
 439
 440         /* We must make sure we don't send a zero flags byte or
 441          * the other end will terminate the flist transfer. */
 442         if (flags == 0 && !S_ISDIR(mode))
 443                 flags |= FLAG_DELETE; /* NOTE: no meaning for non-dir */
 444         if (protocol_version >= 28) {
 445                 if ((flags & 0xFF00) || flags == 0) {
 446                         flags |= EXTENDED_FLAGS;
 447                         write_byte(f, flags);
 448                         write_byte(f, flags >> 8);
 449                 } else
 450                         write_byte(f, flags);
 451         } else {
 452                 if (flags == 0)
 453                         flags |= LONG_NAME;
 454                 write_byte(f, flags);
 455         }
 456         if (flags & SAME_NAME)
 457                 write_byte(f, l1);
 458         if (flags & LONG_NAME)
 459                 write_int(f, l2);
 460         else
 461                 write_byte(f, l2);
 462         write_buf(f, fname + l1, l2);
 463
 464         write_longint(f, file->length);
 465         if (!(flags & SAME_TIME))
 466                 write_int(f, modtime);
 467         if (!(flags & SAME_MODE))
 468                 write_int(f, to_wire_mode(mode));
 469         if (preserve_uid && !(flags & SAME_UID)) {
 470                 add_uid(uid);
 471                 write_int(f, uid);
 472         }
 473         if (preserve_gid && !(flags & SAME_GID)) {
 474                 add_gid(gid);
 475                 write_int(f, gid);
 476         }
 477         if (preserve_devices && IS_DEVICE(mode)) {
 478                 /* If SAME_HIGH_RDEV is off, SAME_RDEV_pre28 is also off.
 479                  * Also, avoid using "rdev" because it may be incomplete. */
 480                 if (!(flags & SAME_HIGH_RDEV))
 481                         write_int(f, file->u.rdev);
 482                 else if (protocol_version >= 28)
 483                         write_byte(f, file->u.rdev);
 484         }
 485
 486 #if SUPPORT_LINKS
 487         if (preserve_links && S_ISLNK(mode)) {
 488                 write_int(f, strlen(file->u.link));
 489                 write_buf(f, file->u.link, strlen(file->u.link));
 490         }
 491 #endif
 492
 493 #if SUPPORT_HARD_LINKS
 494         if (flags & HAS_INODE_DATA) {
 495                 if (protocol_version < 26) {
 496                         /* 32-bit dev_t and ino_t */
 497                         write_int(f, dev);
 498                         write_int(f, file->F_INODE);
 499                 } else {
 500                         /* 64-bit dev_t and ino_t */
 501                         if (!(flags & SAME_DEV))
 502                                 write_longint(f, dev);
 503                         write_longint(f, file->F_INODE);
 504                 }
 505         }
 506 #endif
 507
 508         if (always_checksum) {
 509                 char *sum;
 510                 if (S_ISREG(mode))
 511                         sum = file->u.sum;
 512                 else if (protocol_version < 28) {
 513                         /* Prior to 28, we sent a useless set of nulls. */
 514                         sum = empty_sum;
 515                 } else
 516                         sum = NULL;
 517                 if (sum) {
 518                         write_buf(f, sum, protocol_version < 21? 2
 519                                                         : MD4_SUM_LENGTH);
 520                 }
 521         }
 522
 523         strlcpy(lastname, fname, MAXPATHLEN);
 524         lastname[MAXPATHLEN - 1] = 0;
 525
 526         io_write_phase = "unknown";
 527 }
 528
 529
 530
 531 void receive_file_entry(struct file_struct **fptr, unsigned short flags, int f)
 532 {
 533         static time_t modtime;
 534         static mode_t mode;
 535         static DEV64_T rdev;    /* just high bytes in p28 onward */
 536         static DEV64_T dev;
 537         static uid_t uid;
 538         static gid_t gid;
 539         static char lastname[MAXPATHLEN];
 540         char thisname[MAXPATHLEN];
 541         unsigned int l1 = 0, l2 = 0;
 542         char *p;
 543         struct file_struct *file;
 544
 545         if (!fptr) {
 546                 modtime = 0, mode = 0;
 547                 rdev = 0, dev = 0;
 548                 uid = 0, gid = 0;
 549                 *lastname = '\0';
 550                 return;
 551         }
 552
 553         if (flags & SAME_NAME)
 554                 l1 = read_byte(f);
 555
 556         if (flags & LONG_NAME)
 557                 l2 = read_int(f);
 558         else
 559                 l2 = read_byte(f);
 560
 561         file = new(struct file_struct);
 562         if (!file)
 563                 out_of_memory("receive_file_entry");
 564         memset((char *) file, 0, sizeof(*file));
 565         (*fptr) = file;
 566
 567         if (l2 >= MAXPATHLEN - l1) {
 568                 rprintf(FERROR,
 569                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 570                         flags, l1, l2, lastname);
 571                 overflow("receive_file_entry");
 572         }
 573
 574         strlcpy(thisname, lastname, l1 + 1);
 575         read_sbuf(f, &thisname[l1], l2);
 576         thisname[l1 + l2] = 0;
 577
 578         strlcpy(lastname, thisname, MAXPATHLEN);
 579         lastname[MAXPATHLEN - 1] = 0;
 580
 581         clean_fname(thisname);
 582
 583         if (sanitize_paths) {
 584                 sanitize_path(thisname, NULL);
 585         }
 586
 587         if ((p = strrchr(thisname, '/'))) {
 588                 static char *lastdir;
 589                 *p = 0;
 590                 if (lastdir && strcmp(thisname, lastdir) == 0)
 591                         file->dirname = lastdir;
 592                 else {
 593                         file->dirname = strdup(thisname);
 594                         lastdir = file->dirname;
 595                 }
 596                 file->basename = strdup(p + 1);
 597         } else {
 598                 file->dirname = NULL;
 599                 file->basename = strdup(thisname);
 600         }
 601
 602         if (!file->basename)
 603                 out_of_memory("receive_file_entry 1");
 604
 605         file->flags = flags;
 606         file->length = read_longint(f);
 607         if (!(flags & SAME_TIME))
 608                 modtime = (time_t)read_int(f);
 609         file->modtime = modtime;
 610         if (!(flags & SAME_MODE))
 611                 mode = from_wire_mode(read_int(f));
 612         file->mode = mode;
 613
 614         if (preserve_uid) {
 615                 if (!(flags & SAME_UID))
 616                         uid = (uid_t)read_int(f);
 617                 file->uid = uid;
 618         }
 619         if (preserve_gid) {
 620                 if (!(flags & SAME_GID))
 621                         gid = (gid_t)read_int(f);
 622                 file->gid = gid;
 623         }
 624         if (preserve_devices) {
 625                 if (protocol_version < 28) {
 626                         if (IS_DEVICE(mode)) {
 627                                 if (!(flags & SAME_RDEV_pre28))
 628                                         rdev = (DEV64_T)read_int(f);
 629                                 file->u.rdev = rdev;
 630                         } else
 631                                 rdev = 0;
 632                 } else if (IS_DEVICE(mode)) {
 633                         if (!(flags & SAME_HIGH_RDEV)) {
 634                                 file->u.rdev = (DEV64_T)read_int(f);
 635                                 rdev = file->u.rdev & ~0xFF;
 636                         } else
 637                                 file->u.rdev = rdev | (DEV64_T)read_byte(f);
 638                 }
 639         }
 640
 641         if (preserve_links && S_ISLNK(mode)) {
 642                 int l = read_int(f);
 643                 if (l < 0) {
 644                         rprintf(FERROR, "overflow: l=%d\n", l);
 645                         overflow("receive_file_entry");
 646                 }
 647                 if (!(file->u.link = new_array(char, l + 1)))
 648                         out_of_memory("receive_file_entry 2");
 649                 read_sbuf(f, file->u.link, l);
 650                 if (sanitize_paths)
 651                         sanitize_path(file->u.link, file->dirname);
 652         }
 653 #if SUPPORT_HARD_LINKS
 654         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 655                 flags |= HAS_INODE_DATA;
 656         if (flags & HAS_INODE_DATA) {
 657                 if (!(file->link_u.idev = new(struct idev)))
 658                         out_of_memory("file inode data");
 659                 if (protocol_version < 26) {
 660                         dev = read_int(f);
 661                         file->F_INODE = read_int(f);
 662                 } else {
 663                         if (!(flags & SAME_DEV))
 664                                 dev = read_longint(f);
 665                         file->F_INODE = read_longint(f);
 666                 }
 667                 file->F_DEV = dev;
 668         }
 669 #endif
 670
 671         if (always_checksum) {
 672                 char *sum;
 673                 if (S_ISREG(mode)) {
 674                         sum = file->u.sum = new_array(char, MD4_SUM_LENGTH);
 675                         if (!sum)
 676                                 out_of_memory("md4 sum");
 677                 } else if (protocol_version < 28) {
 678                         /* Prior to 28, we get a useless set of nulls. */
 679                         sum = empty_sum;
 680                 } else
 681                         sum = NULL;
 682                 if (sum) {
 683                         read_buf(f, sum, protocol_version < 21? 2
 684                                                 : MD4_SUM_LENGTH);
 685                 }
 686         }
 687
 688         if (!preserve_perms) {
 689                 extern int orig_umask;
 690                 /* set an appropriate set of permissions based on original
 691                  * permissions and umask. This emulates what GNU cp does */
 692                 file->mode &= ~orig_umask;
 693         }
 694 }
 695
 696
 697 /* determine if a file in a different filesstem should be skipped
 698    when one_file_system is set. We bascally only want to include
 699    the mount points - but they can be hard to find! */
 700 static int skip_filesystem(char *fname, STRUCT_STAT * st)
 701 {
 702         STRUCT_STAT st2;
 703         char *p = strrchr(fname, '/');
 704
 705         /* skip all but directories */
 706         if (!S_ISDIR(st->st_mode))
 707                 return 1;
 708
 709         /* if its not a subdirectory then allow */
 710         if (!p)
 711                 return 0;
 712
 713         *p = 0;
 714         if (link_stat(fname, &st2)) {
 715                 *p = '/';
 716                 return 0;
 717         }
 718         *p = '/';
 719
 720         return (st2.st_dev != filesystem_dev);
 721 }
 722
 723 #define STRDUP(ap, p)   (ap ? string_area_strdup(ap, p) : strdup(p))
 724 /* IRIX cc cares that the operands to the ternary have the same type. */
 725 #define MALLOC(ap, i)   (ap ? (void*) string_area_malloc(ap, i) : malloc(i))
 726
 727 /**
 728  * Create a file_struct for a named file by reading its stat()
 729  * information and performing extensive checks against global
 730  * options.
 731  *
 732  * @return the new file, or NULL if there was an error or this file
 733  * should be excluded.
 734  *
 735  * @todo There is a small optimization opportunity here to avoid
 736  * stat()ing the file in some circumstances, which has a certain cost.
 737  * We are called immediately after doing readdir(), and so we may
 738  * already know the d_type of the file.  We could for example avoid
 739  * statting directories if we're not recursing, but this is not a very
 740  * important case.  Some systems may not have d_type.
 741  **/
 742 struct file_struct *make_file(char *fname, struct string_area **ap,
 743                               int exclude_level)
 744 {
 745         struct file_struct *file;
 746         STRUCT_STAT st;
 747         char sum[SUM_LENGTH];
 748         char *p;
 749         char cleaned_name[MAXPATHLEN];
 750         char linkbuf[MAXPATHLEN];
 751
 752         strlcpy(cleaned_name, fname, MAXPATHLEN);
 753         cleaned_name[MAXPATHLEN - 1] = 0;
 754         clean_fname(cleaned_name);
 755         if (sanitize_paths)
 756                 sanitize_path(cleaned_name, NULL);
 757         fname = cleaned_name;
 758
 759         memset(sum, 0, SUM_LENGTH);
 760
 761         if (readlink_stat(fname, &st, linkbuf) != 0) {
 762                 int save_errno = errno;
 763                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
 764                         /* either symlink pointing nowhere or file that
 765                          * was removed during rsync run; see if excluded
 766                          * before reporting an error */
 767                         if (check_exclude_file(fname, 0, exclude_level)) {
 768                                 /* file is excluded anyway, ignore silently */
 769                                 return NULL;
 770                         }
 771                 }
 772                 io_error |= IOERR_GENERAL;
 773                 rprintf(FERROR, "readlink %s failed: %s\n",
 774                         full_fname(fname), strerror(save_errno));
 775                 return NULL;
 776         }
 777
 778         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 779         if (exclude_level == NO_EXCLUDES)
 780                 goto skip_excludes;
 781
 782         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 783                 rprintf(FINFO, "skipping directory %s\n", fname);
 784                 return NULL;
 785         }
 786
 787         if (one_file_system && st.st_dev != filesystem_dev) {
 788                 if (skip_filesystem(fname, &st))
 789                         return NULL;
 790         }
 791
 792         if (check_exclude_file(fname, S_ISDIR(st.st_mode) != 0, exclude_level))
 793                 return NULL;
 794
 795         if (lp_ignore_nonreadable(module_id) && access(fname, R_OK) != 0)
 796                 return NULL;
 797
 798       skip_excludes:
 799
 800         if (verbose > 2)
 801                 rprintf(FINFO, "make_file(%s,*,%d)\n", fname, exclude_level);
 802
 803         file = new(struct file_struct);
 804         if (!file)
 805                 out_of_memory("make_file");
 806         memset((char *) file, 0, sizeof(*file));
 807
 808         if ((p = strrchr(fname, '/'))) {
 809                 static char *lastdir;
 810                 *p = 0;
 811                 if (lastdir && strcmp(fname, lastdir) == 0)
 812                         file->dirname = lastdir;
 813                 else {
 814                         file->dirname = strdup(fname);
 815                         lastdir = file->dirname;
 816                 }
 817                 file->basename = STRDUP(ap, p + 1);
 818                 *p = '/';
 819         } else {
 820                 file->dirname = NULL;
 821                 file->basename = STRDUP(ap, fname);
 822         }
 823
 824         file->modtime = st.st_mtime;
 825         file->length = st.st_size;
 826         file->mode = st.st_mode;
 827         file->uid = st.st_uid;
 828         file->gid = st.st_gid;
 829         if (preserve_hard_links) {
 830                 if (protocol_version < 28 ? S_ISREG(st.st_mode)
 831                     : !S_ISDIR(st.st_mode) && st.st_nlink > 1) {
 832                         if (!(file->link_u.idev = new(struct idev)))
 833                                 out_of_memory("file inode data");
 834                         file->F_DEV = st.st_dev;
 835                         file->F_INODE = st.st_ino;
 836                 }
 837         }
 838 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 839         if (IS_DEVICE(st.st_mode))
 840                 file->u.rdev = st.st_rdev;
 841 #endif
 842
 843 #if SUPPORT_LINKS
 844         if (S_ISLNK(st.st_mode))
 845                 file->u.link = STRDUP(ap, linkbuf);
 846 #endif
 847
 848         if (always_checksum && S_ISREG(st.st_mode)) {
 849                 if (!(file->u.sum = (char*)MALLOC(ap, MD4_SUM_LENGTH)))
 850                         out_of_memory("md4 sum");
 851                 file_checksum(fname, file->u.sum, st.st_size);
 852         }
 853
 854         if (flist_dir) {
 855                 static char *lastdir;
 856                 if (lastdir && strcmp(lastdir, flist_dir) == 0)
 857                         file->basedir = lastdir;
 858                 else {
 859                         file->basedir = strdup(flist_dir);
 860                         lastdir = file->basedir;
 861                 }
 862         } else
 863                 file->basedir = NULL;
 864
 865         if (!S_ISDIR(st.st_mode))
 866                 stats.total_size += st.st_size;
 867
 868         return file;
 869 }
 870
 871
 872 void send_file_name(int f, struct file_list *flist, char *fname,
 873                     int recursive, unsigned short base_flags)
 874 {
 875         struct file_struct *file;
 876         char fbuf[MAXPATHLEN];
 877         extern int delete_excluded;
 878
 879         /* f is set to -1 when calculating deletion file list */
 880         file = make_file(fname, &flist->string_area,
 881                          f == -1 && delete_excluded? SERVER_EXCLUDES
 882                                                    : ALL_EXCLUDES);
 883
 884         if (!file)
 885                 return;
 886
 887         maybe_emit_filelist_progress(flist);
 888
 889         flist_expand(flist);
 890
 891         if (write_batch)
 892                 file->flags |= FLAG_DELETE;
 893
 894         if (file->basename[0]) {
 895                 flist->files[flist->count++] = file;
 896                 send_file_entry(file, f, base_flags);
 897         }
 898
 899         if (S_ISDIR(file->mode) && recursive) {
 900                 struct exclude_struct **last_exclude_list =
 901                     local_exclude_list;
 902                 send_directory(f, flist, f_name_to(file, fbuf, sizeof fbuf));
 903                 local_exclude_list = last_exclude_list;
 904                 return;
 905         }
 906 }
 907
 908
 909 static void send_directory(int f, struct file_list *flist, char *dir)
 910 {
 911         DIR *d;
 912         struct dirent *di;
 913         char fname[MAXPATHLEN];
 914         int l;
 915         char *p;
 916
 917         d = opendir(dir);
 918         if (!d) {
 919                 io_error |= IOERR_GENERAL;
 920                 rprintf(FERROR, "opendir %s failed: %s\n",
 921                         full_fname(dir), strerror(errno));
 922                 return;
 923         }
 924
 925         strlcpy(fname, dir, MAXPATHLEN);
 926         l = strlen(fname);
 927         if (fname[l - 1] != '/') {
 928                 if (l == MAXPATHLEN - 1) {
 929                         io_error |= IOERR_GENERAL;
 930                         rprintf(FERROR, "skipping long-named directory: %s\n",
 931                                 full_fname(fname));
 932                         closedir(d);
 933                         return;
 934                 }
 935                 strlcat(fname, "/", MAXPATHLEN);
 936                 l++;
 937         }
 938         p = fname + strlen(fname);
 939
 940         local_exclude_list = NULL;
 941
 942         if (cvs_exclude) {
 943                 if (strlen(fname) + strlen(".cvsignore") <= MAXPATHLEN - 1) {
 944                         strcpy(p, ".cvsignore");
 945                         add_exclude_file(&local_exclude_list,fname,MISSING_OK,ADD_EXCLUDE);
 946                 } else {
 947                         io_error |= IOERR_GENERAL;
 948                         rprintf(FINFO,
 949                                 "cannot cvs-exclude in long-named directory %s\n",
 950                                 full_fname(fname));
 951                 }
 952         }
 953
 954         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 955                 char *dname = d_name(di);
 956                 if (dname[0] == '.' && (dname[1] == '\0'
 957                     || (dname[1] == '.' && dname[2] == '\0')))
 958                         continue;
 959                 strlcpy(p, dname, MAXPATHLEN - l);
 960                 send_file_name(f, flist, fname, recurse, 0);
 961         }
 962         if (errno) {
 963                 io_error |= IOERR_GENERAL;
 964                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
 965                     dir, errno, strerror(errno));
 966         }
 967
 968         if (local_exclude_list)
 969                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
 970
 971         closedir(d);
 972 }
 973
 974
 975 /**
 976  * The delete_files() function in receiver.c sets f to -1 so that we just
 977  * construct the file list in memory without sending it over the wire.  It
 978  * also has the side-effect of ignoring user-excludes if delete_excluded
 979  * is set (so that the delete list includes user-excluded files).
 980  **/
 981 struct file_list *send_file_list(int f, int argc, char *argv[])
 982 {
 983         int l;
 984         STRUCT_STAT st;
 985         char *p, *dir, *olddir;
 986         char lastpath[MAXPATHLEN] = "";
 987         struct file_list *flist;
 988         int64 start_write;
 989         int use_ff_fd = 0;
 990
 991         if (show_filelist_p() && f != -1)
 992                 start_filelist_progress("building file list");
 993
 994         start_write = stats.total_written;
 995
 996         flist = flist_new();
 997
 998         if (f != -1) {
 999                 io_start_buffering_out(f);
1000                 if (filesfrom_fd >= 0) {
1001                         if (argv[0] && !push_dir(argv[0], 0)) {
1002                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1003                                         full_fname(argv[0]), strerror(errno));
1004                                 exit_cleanup(RERR_FILESELECT);
1005                         }
1006                         use_ff_fd = 1;
1007                 }
1008         }
1009
1010         while (1) {
1011                 char fname2[MAXPATHLEN];
1012                 char *fname = fname2;
1013
1014                 if (use_ff_fd) {
1015                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1016                                 break;
1017                         sanitize_path(fname, NULL);
1018                 } else {
1019                         if (argc-- == 0)
1020                                 break;
1021                         strlcpy(fname, *argv++, MAXPATHLEN);
1022                         if (sanitize_paths)
1023                                 sanitize_path(fname, NULL);
1024                 }
1025
1026                 l = strlen(fname);
1027                 if (fname[l - 1] == '/') {
1028                         if (l == 2 && fname[0] == '.') {
1029                                 /* Turn "./" into just "." rather than "./." */
1030                                 fname[1] = '\0';
1031                         } else {
1032                                 strlcat(fname, ".", MAXPATHLEN);
1033                         }
1034                 }
1035
1036                 if (link_stat(fname, &st) != 0) {
1037                         if (f != -1) {
1038                                 io_error |= IOERR_GENERAL;
1039                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1040                                         full_fname(fname), strerror(errno));
1041                         }
1042                         continue;
1043                 }
1044
1045                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1046                         rprintf(FINFO, "skipping directory %s\n", fname);
1047                         continue;
1048                 }
1049
1050                 dir = NULL;
1051                 olddir = NULL;
1052
1053                 if (!relative_paths) {
1054                         p = strrchr(fname, '/');
1055                         if (p) {
1056                                 *p = 0;
1057                                 if (p == fname)
1058                                         dir = "/";
1059                                 else
1060                                         dir = fname;
1061                                 fname = p + 1;
1062                         }
1063                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1064                         /* this ensures we send the intermediate directories,
1065                            thus getting their permissions right */
1066                         char *lp = lastpath, *fn = fname, *slash = fname;
1067                         *p = 0;
1068                         /* Skip any initial directories in our path that we
1069                          * have in common with lastpath. */
1070                         while (*fn && *lp == *fn) {
1071                                 if (*fn == '/')
1072                                         slash = fn;
1073                                 lp++, fn++;
1074                         }
1075                         *p = '/';
1076                         if (fn != p || (*lp && *lp != '/')) {
1077                                 int copy_links_saved = copy_links;
1078                                 int recurse_saved = recurse;
1079                                 copy_links = copy_unsafe_links;
1080                                 /* set recurse to 1 to prevent make_file
1081                                  * from ignoring directory, but still
1082                                  * turn off the recursive parameter to
1083                                  * send_file_name */
1084                                 recurse = 1;
1085                                 while ((slash = strchr(slash+1, '/')) != 0) {
1086                                         *slash = 0;
1087                                         send_file_name(f, flist, fname, 0, 0);
1088                                         *slash = '/';
1089                                 }
1090                                 copy_links = copy_links_saved;
1091                                 recurse = recurse_saved;
1092                                 *p = 0;
1093                                 strlcpy(lastpath, fname, sizeof lastpath);
1094                                 *p = '/';
1095                         }
1096                 }
1097
1098                 if (!*fname)
1099                         fname = ".";
1100
1101                 if (dir && *dir) {
1102                         olddir = push_dir(dir, 1);
1103
1104                         if (!olddir) {
1105                                 io_error |= IOERR_GENERAL;
1106                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1107                                         full_fname(dir), strerror(errno));
1108                                 continue;
1109                         }
1110
1111                         flist_dir = dir;
1112                 }
1113
1114                 if (one_file_system)
1115                         set_filesystem(fname);
1116
1117                 send_file_name(f, flist, fname, recurse, FLAG_DELETE);
1118
1119                 if (olddir != NULL) {
1120                         flist_dir = NULL;
1121                         if (pop_dir(olddir) != 0) {
1122                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1123                                         full_fname(dir), strerror(errno));
1124                                 exit_cleanup(RERR_FILESELECT);
1125                         }
1126                 }
1127         }
1128
1129         if (f != -1) {
1130                 send_file_entry(NULL, f, 0);
1131
1132                 if (show_filelist_p())
1133                         finish_filelist_progress(flist);
1134         }
1135
1136         clean_flist(flist, 0, 0);
1137
1138         if (f != -1) {
1139                 /* Now send the uid/gid list. This was introduced in
1140                  * protocol version 15 */
1141                 send_uid_list(f);
1142
1143                 /* send the io_error flag */
1144                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1145
1146                 io_end_buffering();
1147                 stats.flist_size = stats.total_written - start_write;
1148                 stats.num_files = flist->count;
1149                 if (write_batch)
1150                         write_batch_flist_info(flist->count, flist->files);
1151         }
1152
1153         if (verbose > 2)
1154                 rprintf(FINFO, "send_file_list done\n");
1155
1156         return flist;
1157 }
1158
1159
1160 struct file_list *recv_file_list(int f)
1161 {
1162         struct file_list *flist;
1163         unsigned short flags;
1164         int64 start_read;
1165         extern int list_only;
1166
1167         if (show_filelist_p())
1168                 start_filelist_progress("receiving file list");
1169
1170         start_read = stats.total_read;
1171
1172         flist = new(struct file_list);
1173         if (!flist)
1174                 goto oom;
1175
1176         flist->count = 0;
1177         flist->malloced = 1000;
1178         flist->files = new_array(struct file_struct *, flist->malloced);
1179         if (!flist->files)
1180                 goto oom;
1181
1182
1183         while ((flags = read_byte(f)) != 0) {
1184                 int i = flist->count;
1185
1186                 flist_expand(flist);
1187
1188                 if (protocol_version >= 28 && (flags & EXTENDED_FLAGS))
1189                         flags |= read_byte(f) << 8;
1190                 receive_file_entry(&flist->files[i], flags, f);
1191
1192                 if (S_ISREG(flist->files[i]->mode))
1193                         stats.total_size += flist->files[i]->length;
1194
1195                 flist->count++;
1196
1197                 maybe_emit_filelist_progress(flist);
1198
1199                 if (verbose > 2) {
1200                         rprintf(FINFO, "recv_file_name(%s)\n",
1201                                 f_name(flist->files[i]));
1202                 }
1203         }
1204         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1205
1206         if (verbose > 2)
1207                 rprintf(FINFO, "received %d names\n", flist->count);
1208
1209         if (show_filelist_p())
1210                 finish_filelist_progress(flist);
1211
1212         clean_flist(flist, relative_paths, 1);
1213
1214         if (f != -1) {
1215                 /* Now send the uid/gid list. This was introduced in
1216                  * protocol version 15 */
1217                 recv_uid_list(f, flist);
1218
1219                 if (!read_batch) {
1220                         /* Recv the io_error flag */
1221                         if (lp_ignore_errors(module_id) || ignore_errors)
1222                                 read_int(f);
1223                         else
1224                                 io_error |= read_int(f);
1225                 }
1226         }
1227
1228         if (list_only) {
1229                 int i;
1230                 for (i = 0; i < flist->count; i++)
1231                         list_file_entry(flist->files[i]);
1232         }
1233
1234         if (verbose > 2)
1235                 rprintf(FINFO, "recv_file_list done\n");
1236
1237         stats.flist_size = stats.total_read - start_read;
1238         stats.num_files = flist->count;
1239
1240         return flist;
1241
1242       oom:
1243         out_of_memory("recv_file_list");
1244         return NULL;            /* not reached */
1245 }
1246
1247
1248 int file_compare(struct file_struct **file1, struct file_struct **file2)
1249 {
1250         struct file_struct *f1 = *file1;
1251         struct file_struct *f2 = *file2;
1252
1253         if (!f1->basename && !f2->basename)
1254                 return 0;
1255         if (!f1->basename)
1256                 return -1;
1257         if (!f2->basename)
1258                 return 1;
1259         if (f1->dirname == f2->dirname)
1260                 return u_strcmp(f1->basename, f2->basename);
1261         return f_name_cmp(f1, f2);
1262 }
1263
1264
1265 int flist_find(struct file_list *flist, struct file_struct *f)
1266 {
1267         int low = 0, high = flist->count - 1;
1268
1269         while (high >= 0 && !flist->files[high]->basename) high--;
1270
1271         if (high < 0)
1272                 return -1;
1273
1274         while (low != high) {
1275                 int mid = (low + high) / 2;
1276                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1277                 if (ret == 0)
1278                         return flist_up(flist, mid);
1279                 if (ret > 0)
1280                         high = mid;
1281                 else
1282                         low = mid + 1;
1283         }
1284
1285         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1286                 return flist_up(flist, low);
1287         return -1;
1288 }
1289
1290
1291 /*
1292  * free up one file
1293  */
1294 void free_file(struct file_struct *file)
1295 {
1296         if (!file)
1297                 return;
1298         if (file->basename)
1299                 free(file->basename);
1300         if (!IS_DEVICE(file->mode) && file->u.link)
1301                 free(file->u.link); /* Handles u.sum too. */
1302         if (file->link_u.idev)
1303                 free((char*)file->link_u.idev); /* Handles link_u.links too. */
1304         *file = null_file;
1305 }
1306
1307
1308 /*
1309  * allocate a new file list
1310  */
1311 struct file_list *flist_new(void)
1312 {
1313         struct file_list *flist;
1314
1315         flist = new(struct file_list);
1316         if (!flist)
1317                 out_of_memory("send_file_list");
1318
1319         flist->count = 0;
1320         flist->malloced = 0;
1321         flist->files = NULL;
1322
1323 #if ARENA_SIZE > 0
1324         flist->string_area = string_area_new(0);
1325 #else
1326         flist->string_area = NULL;
1327 #endif
1328         return flist;
1329 }
1330
1331 /*
1332  * free up all elements in a flist
1333  */
1334 void flist_free(struct file_list *flist)
1335 {
1336         int i;
1337         for (i = 1; i < flist->count; i++) {
1338                 if (!flist->string_area)
1339                         free_file(flist->files[i]);
1340                 free(flist->files[i]);
1341         }
1342         /* FIXME: I don't think we generally need to blank the flist
1343          * since it's about to be freed.  This will just cause more
1344          * memory traffic.  If you want a freed-memory debugger, you
1345          * know where to get it. */
1346         memset((char *) flist->files, 0,
1347                sizeof(flist->files[0]) * flist->count);
1348         free(flist->files);
1349         if (flist->string_area)
1350                 string_area_free(flist->string_area);
1351         memset((char *) flist, 0, sizeof(*flist));
1352         free(flist);
1353 }
1354
1355
1356 /*
1357  * This routine ensures we don't have any duplicate names in our file list.
1358  * duplicate names can cause corruption because of the pipelining
1359  */
1360 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1361 {
1362         int i, prev_i = 0;
1363
1364         if (!flist || flist->count == 0)
1365                 return;
1366
1367         qsort(flist->files, flist->count,
1368               sizeof(flist->files[0]), (int (*)()) file_compare);
1369
1370         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1371                 if (flist->files[i]->basename) {
1372                         prev_i = i;
1373                         break;
1374                 }
1375         }
1376         while (++i < flist->count) {
1377                 if (!flist->files[i]->basename)
1378                         continue;
1379                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1380                         if (verbose > 1 && !am_server) {
1381                                 rprintf(FINFO,
1382                                         "removing duplicate name %s from file list %d\n",
1383                                         f_name(flist->files[i]), i);
1384                         }
1385                         /* Make sure that if we unduplicate '.', that we don't
1386                          * lose track of a user-specified starting point (or
1387                          * else deletions will mysteriously fail with -R). */
1388                         if (flist->files[i]->flags & FLAG_DELETE)
1389                                 flist->files[prev_i]->flags |= FLAG_DELETE;
1390                         /* it's not great that the flist knows the semantics of
1391                          * the file memory usage, but i'd rather not add a flag
1392                          * byte to that struct.
1393                          * XXX can i use a bit in the flags field? */
1394                         if (flist->string_area)
1395                                 flist->files[i][0] = null_file;
1396                         else
1397                                 free_file(flist->files[i]);
1398                 } else
1399                         prev_i = i;
1400         }
1401
1402         if (strip_root) {
1403                 /* we need to strip off the root directory in the case
1404                    of relative paths, but this must be done _after_
1405                    the sorting phase */
1406                 for (i = 0; i < flist->count; i++) {
1407                         if (flist->files[i]->dirname &&
1408                             flist->files[i]->dirname[0] == '/') {
1409                                 memmove(&flist->files[i]->dirname[0],
1410                                         &flist->files[i]->dirname[1],
1411                                         strlen(flist->files[i]->dirname));
1412                         }
1413
1414                         if (flist->files[i]->dirname &&
1415                             !flist->files[i]->dirname[0]) {
1416                                 flist->files[i]->dirname = NULL;
1417                         }
1418                 }
1419         }
1420
1421         if (verbose <= 3)
1422                 return;
1423
1424         for (i = 0; i < flist->count; i++) {
1425                 rprintf(FINFO, "[%ld] i=%d %s %s mode=0%o len=%.0f\n",
1426                         (long) getpid(), i,
1427                         NS(flist->files[i]->dirname),
1428                         NS(flist->files[i]->basename),
1429                         (int) flist->files[i]->mode,
1430                         (double) flist->files[i]->length);
1431         }
1432 }
1433
1434
1435 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1436
1437 /* Compare the names of two file_struct entities, just like strcmp()
1438  * would do if it were operating on the joined strings.  We assume
1439  * that there are no 0-length strings.
1440  */
1441 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1442 {
1443         int dif;
1444         const uchar *c1, *c2;
1445         enum fnc_state state1, state2;
1446
1447         if (!f1 || !f1->basename) {
1448                 if (!f2 || !f2->basename)
1449                         return 0;
1450                 return -1;
1451         }
1452         if (!f2 || !f2->basename)
1453                 return 1;
1454
1455         if (!(c1 = (uchar*)f1->dirname)) {
1456                 state1 = fnc_BASE;
1457                 c1 = (uchar*)f1->basename;
1458         } else
1459                 state1 = fnc_DIR;
1460         if (!(c2 = (uchar*)f2->dirname)) {
1461                 state2 = fnc_BASE;
1462                 c2 = (uchar*)f2->basename;
1463         } else
1464                 state2 = fnc_DIR;
1465
1466         while (1) {
1467                 if ((dif = (int)*c1 - (int)*c2) != 0)
1468                         break;
1469                 if (!*++c1) {
1470                         switch (state1) {
1471                         case fnc_DIR:
1472                                 state1 = fnc_SLASH;
1473                                 c1 = (uchar*)"/";
1474                                 break;
1475                         case fnc_SLASH:
1476                                 state1 = fnc_BASE;
1477                                 c1 = (uchar*)f1->basename;
1478                                 break;
1479                         case fnc_BASE:
1480                                 break;
1481                         }
1482                 }
1483                 if (!*++c2) {
1484                         switch (state2) {
1485                         case fnc_DIR:
1486                                 state2 = fnc_SLASH;
1487                                 c2 = (uchar*)"/";
1488                                 break;
1489                         case fnc_SLASH:
1490                                 state2 = fnc_BASE;
1491                                 c2 = (uchar*)f2->basename;
1492                                 break;
1493                         case fnc_BASE:
1494                                 if (!*c1)
1495                                         return 0;
1496                                 break;
1497                         }
1498                 }
1499         }
1500
1501         return dif;
1502 }
1503
1504
1505 /* Return a copy of the full filename of a flist entry, using the indicated
1506  * buffer.
1507  */
1508 char *f_name_to(struct file_struct *f, char *fbuf, int bsize)
1509 {
1510         if (!f || !f->basename)
1511                 return NULL;
1512
1513         if (f->dirname) {
1514                 int off = strlcpy(fbuf, f->dirname, bsize);
1515                 off += strlcpy(fbuf + off, "/", bsize - off);
1516                 strlcpy(fbuf + off, f->basename, bsize - off);
1517         } else
1518                 strlcpy(fbuf, f->basename, bsize);
1519         return fbuf;
1520 }
1521
1522
1523 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1524  */
1525 char *f_name(struct file_struct *f)
1526 {
1527         static char names[5][MAXPATHLEN];
1528         static unsigned int n;
1529
1530         n = (n + 1) % (sizeof names / sizeof names[0]);
1531
1532         return f_name_to(f, names[n], sizeof names[0]);
1533 }