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
 319
 320 /**
 321  * Make sure @p flist is big enough to hold at least @p flist->count
 322  * entries.
 323  **/
 324 static void flist_expand(struct file_list *flist)
 325 {
 326         if (flist->count >= flist->malloced) {
 327                 void *new_ptr;
 328
 329                 if (flist->malloced < 1000)
 330                         flist->malloced += 1000;
 331                 else
 332                         flist->malloced *= 2;
 333
 334                 if (flist->files) {
 335                         new_ptr = realloc_array(flist->files,
 336                                                 struct file_struct *,
 337                                                 flist->malloced);
 338                 } else {
 339                         new_ptr = new_array(struct file_struct *,
 340                                             flist->malloced);
 341                 }
 342
 343                 if (verbose >= 2) {
 344                         rprintf(FINFO, "expand file_list to %.0f bytes, did%s move\n",
 345                                 (double)sizeof(flist->files[0])
 346                                 * flist->malloced,
 347                                 (new_ptr == flist->files) ? " not" : "");
 348                 }
 349
 350                 flist->files = (struct file_struct **) new_ptr;
 351
 352                 if (!flist->files)
 353                         out_of_memory("flist_expand");
 354         }
 355 }
 356
 357 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 358 {
 359         unsigned short flags;
 360         static time_t modtime;
 361         static mode_t mode;
 362         static DEV64_T rdev;    /* just high bytes in p28 onward */
 363         static DEV64_T dev;
 364         static uid_t uid;
 365         static gid_t gid;
 366         static char lastname[MAXPATHLEN];
 367         char *fname, fbuf[MAXPATHLEN];
 368         int l1, l2;
 369
 370         if (f == -1)
 371                 return;
 372
 373         if (!file) {
 374                 write_byte(f, 0);
 375                 modtime = 0, mode = 0;
 376                 rdev = 0, dev = 0;
 377                 uid = 0, gid = 0;
 378                 *lastname = '\0';
 379                 return;
 380         }
 381
 382         io_write_phase = "send_file_entry";
 383
 384         fname = f_name_to(file, fbuf, sizeof fbuf);
 385
 386         flags = base_flags;
 387
 388         if (file->mode == mode)
 389                 flags |= SAME_MODE;
 390         else
 391                 mode = file->mode;
 392         if (preserve_devices) {
 393                 if (protocol_version < 28) {
 394                         if (IS_DEVICE(mode)) {
 395                                 if (file->u.rdev == rdev) {
 396                                         /* Set both flags so that the test when
 397                                          * writing the data is simpler. */
 398                                         flags |= SAME_RDEV_pre28|SAME_HIGH_RDEV;
 399                                 } else
 400                                         rdev = file->u.rdev;
 401                         } else
 402                                 rdev = 0;
 403                 } else if (IS_DEVICE(mode)) {
 404                         if ((file->u.rdev & ~0xFF) == rdev)
 405                                 flags |= SAME_HIGH_RDEV;
 406                         else
 407                                 rdev = file->u.rdev & ~0xFF;
 408                 }
 409         }
 410         if (file->uid == uid)
 411                 flags |= SAME_UID;
 412         else
 413                 uid = file->uid;
 414         if (file->gid == gid)
 415                 flags |= SAME_GID;
 416         else
 417                 gid = file->gid;
 418         if (file->modtime == modtime)
 419                 flags |= SAME_TIME;
 420         else
 421                 modtime = file->modtime;
 422         if (file->link_u.idev) {
 423                 if (file->F_DEV == dev) {
 424                         if (protocol_version >= 28)
 425                                 flags |= SAME_DEV;
 426                 } else
 427                         dev = file->F_DEV;
 428                 flags |= HAS_INODE_DATA;
 429         }
 430
 431         for (l1 = 0;
 432              lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 433              l1++) {}
 434         l2 = strlen(fname+l1);
 435
 436         if (l1 > 0)
 437                 flags |= SAME_NAME;
 438         if (l2 > 255)
 439                 flags |= LONG_NAME;
 440
 441         /* We must make sure we don't send a zero flags byte or
 442          * the other end will terminate the flist transfer. */
 443         if (flags == 0 && !S_ISDIR(mode))
 444                 flags |= FLAG_DELETE; /* NOTE: no meaning for non-dir */
 445         if (protocol_version >= 28) {
 446                 if ((flags & 0xFF00) || flags == 0) {
 447                         flags |= EXTENDED_FLAGS;
 448                         write_byte(f, flags);
 449                         write_byte(f, flags >> 8);
 450                 } else
 451                         write_byte(f, flags);
 452         } else {
 453                 if (flags == 0)
 454                         flags |= LONG_NAME;
 455                 write_byte(f, flags);
 456         }
 457         if (flags & SAME_NAME)
 458                 write_byte(f, l1);
 459         if (flags & LONG_NAME)
 460                 write_int(f, l2);
 461         else
 462                 write_byte(f, l2);
 463         write_buf(f, fname + l1, l2);
 464
 465         write_longint(f, file->length);
 466         if (!(flags & SAME_TIME))
 467                 write_int(f, modtime);
 468         if (!(flags & SAME_MODE))
 469                 write_int(f, to_wire_mode(mode));
 470         if (preserve_uid && !(flags & SAME_UID)) {
 471                 add_uid(uid);
 472                 write_int(f, uid);
 473         }
 474         if (preserve_gid && !(flags & SAME_GID)) {
 475                 add_gid(gid);
 476                 write_int(f, gid);
 477         }
 478         if (preserve_devices && IS_DEVICE(mode)) {
 479                 /* If SAME_HIGH_RDEV is off, SAME_RDEV_pre28 is also off.
 480                  * Also, avoid using "rdev" because it may be incomplete. */
 481                 if (!(flags & SAME_HIGH_RDEV))
 482                         write_int(f, file->u.rdev);
 483                 else if (protocol_version >= 28)
 484                         write_byte(f, file->u.rdev);
 485         }
 486
 487 #if SUPPORT_LINKS
 488         if (preserve_links && S_ISLNK(mode)) {
 489                 write_int(f, strlen(file->u.link));
 490                 write_buf(f, file->u.link, strlen(file->u.link));
 491         }
 492 #endif
 493
 494 #if SUPPORT_HARD_LINKS
 495         if (flags & HAS_INODE_DATA) {
 496                 if (protocol_version < 26) {
 497                         /* 32-bit dev_t and ino_t */
 498                         write_int(f, dev);
 499                         write_int(f, file->F_INODE);
 500                 } else {
 501                         /* 64-bit dev_t and ino_t */
 502                         if (!(flags & SAME_DEV))
 503                                 write_longint(f, dev);
 504                         write_longint(f, file->F_INODE);
 505                 }
 506         }
 507 #endif
 508
 509         if (always_checksum) {
 510                 char *sum;
 511                 if (S_ISREG(mode))
 512                         sum = file->u.sum;
 513                 else if (protocol_version < 28) {
 514                         /* Prior to 28, we sent a useless set of nulls. */
 515                         sum = empty_sum;
 516                 } else
 517                         sum = NULL;
 518                 if (sum) {
 519                         write_buf(f, sum, protocol_version < 21? 2
 520                                                         : MD4_SUM_LENGTH);
 521                 }
 522         }
 523
 524         strlcpy(lastname, fname, MAXPATHLEN);
 525         lastname[MAXPATHLEN - 1] = 0;
 526
 527         io_write_phase = "unknown";
 528 }
 529
 530
 531
 532 void receive_file_entry(struct file_struct **fptr, unsigned short flags, int f)
 533 {
 534         static time_t modtime;
 535         static mode_t mode;
 536         static DEV64_T rdev;    /* just high bytes in p28 onward */
 537         static DEV64_T dev;
 538         static uid_t uid;
 539         static gid_t gid;
 540         static char lastname[MAXPATHLEN];
 541         char thisname[MAXPATHLEN];
 542         unsigned int l1 = 0, l2 = 0;
 543         char *p;
 544         struct file_struct *file;
 545
 546         if (!fptr) {
 547                 modtime = 0, mode = 0;
 548                 rdev = 0, dev = 0;
 549                 uid = 0, gid = 0;
 550                 *lastname = '\0';
 551                 return;
 552         }
 553
 554         if (flags & SAME_NAME)
 555                 l1 = read_byte(f);
 556
 557         if (flags & LONG_NAME)
 558                 l2 = read_int(f);
 559         else
 560                 l2 = read_byte(f);
 561
 562         file = new(struct file_struct);
 563         if (!file)
 564                 out_of_memory("receive_file_entry");
 565         memset((char *) file, 0, sizeof(*file));
 566         (*fptr) = file;
 567
 568         if (l2 >= MAXPATHLEN - l1) {
 569                 rprintf(FERROR,
 570                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 571                         flags, l1, l2, lastname);
 572                 overflow("receive_file_entry");
 573         }
 574
 575         strlcpy(thisname, lastname, l1 + 1);
 576         read_sbuf(f, &thisname[l1], l2);
 577         thisname[l1 + l2] = 0;
 578
 579         strlcpy(lastname, thisname, MAXPATHLEN);
 580         lastname[MAXPATHLEN - 1] = 0;
 581
 582         clean_fname(thisname);
 583
 584         if (sanitize_paths) {
 585                 sanitize_path(thisname, NULL);
 586         }
 587
 588         if ((p = strrchr(thisname, '/'))) {
 589                 static char *lastdir;
 590                 *p = 0;
 591                 if (lastdir && strcmp(thisname, lastdir) == 0)
 592                         file->dirname = lastdir;
 593                 else {
 594                         file->dirname = strdup(thisname);
 595                         lastdir = file->dirname;
 596                 }
 597                 file->basename = strdup(p + 1);
 598         } else {
 599                 file->dirname = NULL;
 600                 file->basename = strdup(thisname);
 601         }
 602
 603         if (!file->basename)
 604                 out_of_memory("receive_file_entry 1");
 605
 606         file->flags = flags;
 607         file->length = read_longint(f);
 608         if (!(flags & SAME_TIME))
 609                 modtime = (time_t)read_int(f);
 610         file->modtime = modtime;
 611         if (!(flags & SAME_MODE))
 612                 mode = from_wire_mode(read_int(f));
 613         file->mode = mode;
 614
 615         if (preserve_uid) {
 616                 if (!(flags & SAME_UID))
 617                         uid = (uid_t)read_int(f);
 618                 file->uid = uid;
 619         }
 620         if (preserve_gid) {
 621                 if (!(flags & SAME_GID))
 622                         gid = (gid_t)read_int(f);
 623                 file->gid = gid;
 624         }
 625         if (preserve_devices) {
 626                 if (protocol_version < 28) {
 627                         if (IS_DEVICE(mode)) {
 628                                 if (!(flags & SAME_RDEV_pre28))
 629                                         rdev = (DEV64_T)read_int(f);
 630                                 file->u.rdev = rdev;
 631                         } else
 632                                 rdev = 0;
 633                 } else if (IS_DEVICE(mode)) {
 634                         if (!(flags & SAME_HIGH_RDEV)) {
 635                                 file->u.rdev = (DEV64_T)read_int(f);
 636                                 rdev = file->u.rdev & ~0xFF;
 637                         } else
 638                                 file->u.rdev = rdev | (DEV64_T)read_byte(f);
 639                 }
 640         }
 641
 642         if (preserve_links && S_ISLNK(mode)) {
 643                 int l = read_int(f);
 644                 if (l < 0) {
 645                         rprintf(FERROR, "overflow: l=%d\n", l);
 646                         overflow("receive_file_entry");
 647                 }
 648                 if (!(file->u.link = new_array(char, l + 1)))
 649                         out_of_memory("receive_file_entry 2");
 650                 read_sbuf(f, file->u.link, l);
 651                 if (sanitize_paths)
 652                         sanitize_path(file->u.link, file->dirname);
 653         }
 654 #if SUPPORT_HARD_LINKS
 655         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 656                 flags |= HAS_INODE_DATA;
 657         if (flags & HAS_INODE_DATA) {
 658                 if (!(file->link_u.idev = new(struct idev)))
 659                         out_of_memory("file inode data");
 660                 if (protocol_version < 26) {
 661                         dev = read_int(f);
 662                         file->F_INODE = read_int(f);
 663                 } else {
 664                         if (!(flags & SAME_DEV))
 665                                 dev = read_longint(f);
 666                         file->F_INODE = read_longint(f);
 667                 }
 668                 file->F_DEV = dev;
 669         }
 670 #endif
 671
 672         if (always_checksum) {
 673                 char *sum;
 674                 if (S_ISREG(mode)) {
 675                         sum = file->u.sum = new_array(char, MD4_SUM_LENGTH);
 676                         if (!sum)
 677                                 out_of_memory("md4 sum");
 678                 } else if (protocol_version < 28) {
 679                         /* Prior to 28, we get a useless set of nulls. */
 680                         sum = empty_sum;
 681                 } else
 682                         sum = NULL;
 683                 if (sum) {
 684                         read_buf(f, sum, protocol_version < 21? 2
 685                                                 : MD4_SUM_LENGTH);
 686                 }
 687         }
 688
 689         if (!preserve_perms) {
 690                 extern int orig_umask;
 691                 /* set an appropriate set of permissions based on original
 692                  * permissions and umask. This emulates what GNU cp does */
 693                 file->mode &= ~orig_umask;
 694         }
 695 }
 696
 697
 698 /* determine if a file in a different filesstem should be skipped
 699    when one_file_system is set. We bascally only want to include
 700    the mount points - but they can be hard to find! */
 701 static int skip_filesystem(char *fname, STRUCT_STAT * st)
 702 {
 703         STRUCT_STAT st2;
 704         char *p = strrchr(fname, '/');
 705
 706         /* skip all but directories */
 707         if (!S_ISDIR(st->st_mode))
 708                 return 1;
 709
 710         /* if its not a subdirectory then allow */
 711         if (!p)
 712                 return 0;
 713
 714         *p = 0;
 715         if (link_stat(fname, &st2)) {
 716                 *p = '/';
 717                 return 0;
 718         }
 719         *p = '/';
 720
 721         return (st2.st_dev != filesystem_dev);
 722 }
 723
 724 #define STRDUP(ap, p)   (ap ? string_area_strdup(ap, p) : strdup(p))
 725 /* IRIX cc cares that the operands to the ternary have the same type. */
 726 #define MALLOC(ap, i)   (ap ? (void*) string_area_malloc(ap, i) : malloc(i))
 727
 728 /**
 729  * Create a file_struct for a named file by reading its stat()
 730  * information and performing extensive checks against global
 731  * options.
 732  *
 733  * @return the new file, or NULL if there was an error or this file
 734  * should be excluded.
 735  *
 736  * @todo There is a small optimization opportunity here to avoid
 737  * stat()ing the file in some circumstances, which has a certain cost.
 738  * We are called immediately after doing readdir(), and so we may
 739  * already know the d_type of the file.  We could for example avoid
 740  * statting directories if we're not recursing, but this is not a very
 741  * important case.  Some systems may not have d_type.
 742  **/
 743 struct file_struct *make_file(char *fname, struct string_area **ap,
 744                               int exclude_level)
 745 {
 746         struct file_struct *file;
 747         STRUCT_STAT st;
 748         char sum[SUM_LENGTH];
 749         char *p;
 750         char cleaned_name[MAXPATHLEN];
 751         char linkbuf[MAXPATHLEN];
 752
 753         strlcpy(cleaned_name, fname, MAXPATHLEN);
 754         cleaned_name[MAXPATHLEN - 1] = 0;
 755         clean_fname(cleaned_name);
 756         if (sanitize_paths)
 757                 sanitize_path(cleaned_name, NULL);
 758         fname = cleaned_name;
 759
 760         memset(sum, 0, SUM_LENGTH);
 761
 762         if (readlink_stat(fname, &st, linkbuf) != 0) {
 763                 int save_errno = errno;
 764                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
 765                         /* either symlink pointing nowhere or file that
 766                          * was removed during rsync run; see if excluded
 767                          * before reporting an error */
 768                         if (check_exclude_file(fname, 0, exclude_level)) {
 769                                 /* file is excluded anyway, ignore silently */
 770                                 return NULL;
 771                         }
 772                 }
 773                 io_error |= IOERR_GENERAL;
 774                 rprintf(FERROR, "readlink %s failed: %s\n",
 775                         full_fname(fname), strerror(save_errno));
 776                 return NULL;
 777         }
 778
 779         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 780         if (exclude_level == NO_EXCLUDES)
 781                 goto skip_excludes;
 782
 783         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 784                 rprintf(FINFO, "skipping directory %s\n", fname);
 785                 return NULL;
 786         }
 787
 788         if (one_file_system && st.st_dev != filesystem_dev) {
 789                 if (skip_filesystem(fname, &st))
 790                         return NULL;
 791         }
 792
 793         if (check_exclude_file(fname, S_ISDIR(st.st_mode) != 0, exclude_level))
 794                 return NULL;
 795
 796         if (lp_ignore_nonreadable(module_id) && access(fname, R_OK) != 0)
 797                 return NULL;
 798
 799       skip_excludes:
 800
 801         if (verbose > 2)
 802                 rprintf(FINFO, "make_file(%s,*,%d)\n", fname, exclude_level);
 803
 804         file = new(struct file_struct);
 805         if (!file)
 806                 out_of_memory("make_file");
 807         memset((char *) file, 0, sizeof(*file));
 808
 809         if ((p = strrchr(fname, '/'))) {
 810                 static char *lastdir;
 811                 *p = 0;
 812                 if (lastdir && strcmp(fname, lastdir) == 0)
 813                         file->dirname = lastdir;
 814                 else {
 815                         file->dirname = strdup(fname);
 816                         lastdir = file->dirname;
 817                 }
 818                 file->basename = STRDUP(ap, p + 1);
 819                 *p = '/';
 820         } else {
 821                 file->dirname = NULL;
 822                 file->basename = STRDUP(ap, fname);
 823         }
 824
 825         file->modtime = st.st_mtime;
 826         file->length = st.st_size;
 827         file->mode = st.st_mode;
 828         file->uid = st.st_uid;
 829         file->gid = st.st_gid;
 830         if (preserve_hard_links) {
 831                 if (protocol_version < 28 ? S_ISREG(st.st_mode)
 832                     : !S_ISDIR(st.st_mode) && st.st_nlink > 1) {
 833                         if (!(file->link_u.idev = new(struct idev)))
 834                                 out_of_memory("file inode data");
 835                         file->F_DEV = st.st_dev;
 836                         file->F_INODE = st.st_ino;
 837                 }
 838         }
 839 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 840         if (IS_DEVICE(st.st_mode))
 841                 file->u.rdev = st.st_rdev;
 842 #endif
 843
 844 #if SUPPORT_LINKS
 845         if (S_ISLNK(st.st_mode))
 846                 file->u.link = STRDUP(ap, linkbuf);
 847 #endif
 848
 849         if (always_checksum && S_ISREG(st.st_mode)) {
 850                 if (!(file->u.sum = (char*)MALLOC(ap, MD4_SUM_LENGTH)))
 851                         out_of_memory("md4 sum");
 852                 file_checksum(fname, file->u.sum, st.st_size);
 853         }
 854
 855         if (flist_dir) {
 856                 static char *lastdir;
 857                 if (lastdir && strcmp(lastdir, flist_dir) == 0)
 858                         file->basedir = lastdir;
 859                 else {
 860                         file->basedir = strdup(flist_dir);
 861                         lastdir = file->basedir;
 862                 }
 863         } else
 864                 file->basedir = NULL;
 865
 866         if (!S_ISDIR(st.st_mode))
 867                 stats.total_size += st.st_size;
 868
 869         return file;
 870 }
 871
 872
 873 void send_file_name(int f, struct file_list *flist, char *fname,
 874                     int recursive, unsigned short base_flags)
 875 {
 876         struct file_struct *file;
 877         char fbuf[MAXPATHLEN];
 878         extern int delete_excluded;
 879
 880         /* f is set to -1 when calculating deletion file list */
 881         file = make_file(fname, &flist->string_area,
 882                          f == -1 && delete_excluded? SERVER_EXCLUDES
 883                                                    : ALL_EXCLUDES);
 884
 885         if (!file)
 886                 return;
 887
 888         maybe_emit_filelist_progress(flist);
 889
 890         flist_expand(flist);
 891
 892         if (write_batch)
 893                 file->flags |= FLAG_DELETE;
 894
 895         if (file->basename[0]) {
 896                 flist->files[flist->count++] = file;
 897                 send_file_entry(file, f, base_flags);
 898         }
 899
 900         if (S_ISDIR(file->mode) && recursive) {
 901                 struct exclude_struct **last_exclude_list =
 902                     local_exclude_list;
 903                 send_directory(f, flist, f_name_to(file, fbuf, sizeof fbuf));
 904                 local_exclude_list = last_exclude_list;
 905                 return;
 906         }
 907 }
 908
 909
 910 static void send_directory(int f, struct file_list *flist, char *dir)
 911 {
 912         DIR *d;
 913         struct dirent *di;
 914         char fname[MAXPATHLEN];
 915         unsigned int offset;
 916         char *p;
 917
 918         d = opendir(dir);
 919         if (!d) {
 920                 io_error |= IOERR_GENERAL;
 921                 rprintf(FERROR, "opendir %s failed: %s\n",
 922                         full_fname(dir), strerror(errno));
 923                 return;
 924         }
 925
 926         offset = strlcpy(fname, dir, MAXPATHLEN);
 927         p = fname + offset;
 928         if (offset >= MAXPATHLEN || p[-1] != '/') {
 929                 if (offset >= MAXPATHLEN - 1) {
 930                         io_error |= IOERR_GENERAL;
 931                         rprintf(FERROR, "skipping long-named directory: %s\n",
 932                                 full_fname(fname));
 933                         closedir(d);
 934                         return;
 935                 }
 936                 *p++ = '/';
 937                 offset++;
 938         }
 939
 940         local_exclude_list = NULL;
 941
 942         if (cvs_exclude) {
 943                 if (strlcpy(p, ".cvsignore", MAXPATHLEN - offset)
 944                     < MAXPATHLEN - offset)
 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                 if (strlcpy(p, dname, MAXPATHLEN - offset) < MAXPATHLEN - offset)
 960                         send_file_name(f, flist, fname, recurse, 0);
 961                 else {
 962                         io_error |= IOERR_GENERAL;
 963                         rprintf(FINFO,
 964                                 "cannot send long-named file %s\n",
 965                                 full_fname(fname));
 966                 }
 967         }
 968         if (errno) {
 969                 io_error |= IOERR_GENERAL;
 970                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
 971                         dir, errno, strerror(errno));
 972         }
 973
 974         if (local_exclude_list)
 975                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
 976
 977         closedir(d);
 978 }
 979
 980
 981 /**
 982  * The delete_files() function in receiver.c sets f to -1 so that we just
 983  * construct the file list in memory without sending it over the wire.  It
 984  * also has the side-effect of ignoring user-excludes if delete_excluded
 985  * is set (so that the delete list includes user-excluded files).
 986  **/
 987 struct file_list *send_file_list(int f, int argc, char *argv[])
 988 {
 989         int l;
 990         STRUCT_STAT st;
 991         char *p, *dir, olddir[sizeof curr_dir];
 992         char lastpath[MAXPATHLEN] = "";
 993         struct file_list *flist;
 994         int64 start_write;
 995         int use_ff_fd = 0;
 996
 997         if (show_filelist_p() && f != -1)
 998                 start_filelist_progress("building file list");
 999
1000         start_write = stats.total_written;
1001
1002         flist = flist_new();
1003
1004         if (f != -1) {
1005                 io_start_buffering_out(f);
1006                 if (filesfrom_fd >= 0) {
1007                         if (argv[0] && !push_dir(argv[0])) {
1008                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1009                                         full_fname(argv[0]), strerror(errno));
1010                                 exit_cleanup(RERR_FILESELECT);
1011                         }
1012                         use_ff_fd = 1;
1013                 }
1014         }
1015
1016         while (1) {
1017                 char fname2[MAXPATHLEN];
1018                 char *fname = fname2;
1019
1020                 if (use_ff_fd) {
1021                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1022                                 break;
1023                         sanitize_path(fname, NULL);
1024                 } else {
1025                         if (argc-- == 0)
1026                                 break;
1027                         strlcpy(fname, *argv++, MAXPATHLEN);
1028                         if (sanitize_paths)
1029                                 sanitize_path(fname, NULL);
1030                 }
1031
1032                 l = strlen(fname);
1033                 if (fname[l - 1] == '/') {
1034                         if (l == 2 && fname[0] == '.') {
1035                                 /* Turn "./" into just "." rather than "./." */
1036                                 fname[1] = '\0';
1037                         } else if (l < MAXPATHLEN) {
1038                                 fname[l++] = '.';
1039                                 fname[l] = '\0';
1040                         }
1041                 }
1042
1043                 if (link_stat(fname, &st) != 0) {
1044                         if (f != -1) {
1045                                 io_error |= IOERR_GENERAL;
1046                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1047                                         full_fname(fname), strerror(errno));
1048                         }
1049                         continue;
1050                 }
1051
1052                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1053                         rprintf(FINFO, "skipping directory %s\n", fname);
1054                         continue;
1055                 }
1056
1057                 dir = NULL;
1058                 olddir[0] = '\0';
1059
1060                 if (!relative_paths) {
1061                         p = strrchr(fname, '/');
1062                         if (p) {
1063                                 *p = 0;
1064                                 if (p == fname)
1065                                         dir = "/";
1066                                 else
1067                                         dir = fname;
1068                                 fname = p + 1;
1069                         }
1070                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1071                         /* this ensures we send the intermediate directories,
1072                            thus getting their permissions right */
1073                         char *lp = lastpath, *fn = fname, *slash = fname;
1074                         *p = 0;
1075                         /* Skip any initial directories in our path that we
1076                          * have in common with lastpath. */
1077                         while (*fn && *lp == *fn) {
1078                                 if (*fn == '/')
1079                                         slash = fn;
1080                                 lp++, fn++;
1081                         }
1082                         *p = '/';
1083                         if (fn != p || (*lp && *lp != '/')) {
1084                                 int copy_links_saved = copy_links;
1085                                 int recurse_saved = recurse;
1086                                 copy_links = copy_unsafe_links;
1087                                 /* set recurse to 1 to prevent make_file
1088                                  * from ignoring directory, but still
1089                                  * turn off the recursive parameter to
1090                                  * send_file_name */
1091                                 recurse = 1;
1092                                 while ((slash = strchr(slash+1, '/')) != 0) {
1093                                         *slash = 0;
1094                                         send_file_name(f, flist, fname, 0, 0);
1095                                         *slash = '/';
1096                                 }
1097                                 copy_links = copy_links_saved;
1098                                 recurse = recurse_saved;
1099                                 *p = 0;
1100                                 strlcpy(lastpath, fname, sizeof lastpath);
1101                                 *p = '/';
1102                         }
1103                 }
1104
1105                 if (!*fname)
1106                         fname = ".";
1107
1108                 if (dir && *dir) {
1109                         strcpy(olddir, curr_dir); /* can't overflow */
1110
1111                         if (!push_dir(dir)) {
1112                                 io_error |= IOERR_GENERAL;
1113                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1114                                         full_fname(dir), strerror(errno));
1115                                 continue;
1116                         }
1117
1118                         flist_dir = dir;
1119                 }
1120
1121                 if (one_file_system)
1122                         set_filesystem(fname);
1123
1124                 send_file_name(f, flist, fname, recurse, FLAG_DELETE);
1125
1126                 if (olddir[0]) {
1127                         flist_dir = NULL;
1128                         if (!pop_dir(olddir)) {
1129                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1130                                         full_fname(dir), strerror(errno));
1131                                 exit_cleanup(RERR_FILESELECT);
1132                         }
1133                 }
1134         }
1135
1136         if (f != -1) {
1137                 send_file_entry(NULL, f, 0);
1138
1139                 if (show_filelist_p())
1140                         finish_filelist_progress(flist);
1141         }
1142
1143         clean_flist(flist, 0, 0);
1144
1145         if (f != -1) {
1146                 /* Now send the uid/gid list. This was introduced in
1147                  * protocol version 15 */
1148                 send_uid_list(f);
1149
1150                 /* send the io_error flag */
1151                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1152
1153                 io_end_buffering();
1154                 stats.flist_size = stats.total_written - start_write;
1155                 stats.num_files = flist->count;
1156                 if (write_batch)
1157                         write_batch_flist_info(flist->count, flist->files);
1158         }
1159
1160         if (verbose > 2)
1161                 rprintf(FINFO, "send_file_list done\n");
1162
1163         return flist;
1164 }
1165
1166
1167 struct file_list *recv_file_list(int f)
1168 {
1169         struct file_list *flist;
1170         unsigned short flags;
1171         int64 start_read;
1172         extern int list_only;
1173
1174         if (show_filelist_p())
1175                 start_filelist_progress("receiving file list");
1176
1177         start_read = stats.total_read;
1178
1179         flist = new(struct file_list);
1180         if (!flist)
1181                 goto oom;
1182
1183         flist->count = 0;
1184         flist->malloced = 1000;
1185         flist->files = new_array(struct file_struct *, flist->malloced);
1186         if (!flist->files)
1187                 goto oom;
1188
1189
1190         while ((flags = read_byte(f)) != 0) {
1191                 int i = flist->count;
1192
1193                 flist_expand(flist);
1194
1195                 if (protocol_version >= 28 && (flags & EXTENDED_FLAGS))
1196                         flags |= read_byte(f) << 8;
1197                 receive_file_entry(&flist->files[i], flags, f);
1198
1199                 if (S_ISREG(flist->files[i]->mode))
1200                         stats.total_size += flist->files[i]->length;
1201
1202                 flist->count++;
1203
1204                 maybe_emit_filelist_progress(flist);
1205
1206                 if (verbose > 2) {
1207                         rprintf(FINFO, "recv_file_name(%s)\n",
1208                                 f_name(flist->files[i]));
1209                 }
1210         }
1211         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1212
1213         if (verbose > 2)
1214                 rprintf(FINFO, "received %d names\n", flist->count);
1215
1216         if (show_filelist_p())
1217                 finish_filelist_progress(flist);
1218
1219         clean_flist(flist, relative_paths, 1);
1220
1221         if (f != -1) {
1222                 /* Now send the uid/gid list. This was introduced in
1223                  * protocol version 15 */
1224                 recv_uid_list(f, flist);
1225
1226                 if (!read_batch) {
1227                         /* Recv the io_error flag */
1228                         if (lp_ignore_errors(module_id) || ignore_errors)
1229                                 read_int(f);
1230                         else
1231                                 io_error |= read_int(f);
1232                 }
1233         }
1234
1235         if (list_only) {
1236                 int i;
1237                 for (i = 0; i < flist->count; i++)
1238                         list_file_entry(flist->files[i]);
1239         }
1240
1241         if (verbose > 2)
1242                 rprintf(FINFO, "recv_file_list done\n");
1243
1244         stats.flist_size = stats.total_read - start_read;
1245         stats.num_files = flist->count;
1246
1247         return flist;
1248
1249       oom:
1250         out_of_memory("recv_file_list");
1251         return NULL;            /* not reached */
1252 }
1253
1254
1255 int file_compare(struct file_struct **file1, struct file_struct **file2)
1256 {
1257         struct file_struct *f1 = *file1;
1258         struct file_struct *f2 = *file2;
1259
1260         if (!f1->basename && !f2->basename)
1261                 return 0;
1262         if (!f1->basename)
1263                 return -1;
1264         if (!f2->basename)
1265                 return 1;
1266         if (f1->dirname == f2->dirname)
1267                 return u_strcmp(f1->basename, f2->basename);
1268         return f_name_cmp(f1, f2);
1269 }
1270
1271
1272 int flist_find(struct file_list *flist, struct file_struct *f)
1273 {
1274         int low = 0, high = flist->count - 1;
1275
1276         while (high >= 0 && !flist->files[high]->basename) high--;
1277
1278         if (high < 0)
1279                 return -1;
1280
1281         while (low != high) {
1282                 int mid = (low + high) / 2;
1283                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1284                 if (ret == 0)
1285                         return flist_up(flist, mid);
1286                 if (ret > 0)
1287                         high = mid;
1288                 else
1289                         low = mid + 1;
1290         }
1291
1292         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1293                 return flist_up(flist, low);
1294         return -1;
1295 }
1296
1297
1298 /*
1299  * free up one file
1300  */
1301 void free_file(struct file_struct *file)
1302 {
1303         if (!file)
1304                 return;
1305         if (file->basename)
1306                 free(file->basename);
1307         if (!IS_DEVICE(file->mode) && file->u.link)
1308                 free(file->u.link); /* Handles u.sum too. */
1309         if (file->link_u.idev)
1310                 free((char*)file->link_u.idev); /* Handles link_u.links too. */
1311         *file = null_file;
1312 }
1313
1314
1315 /*
1316  * allocate a new file list
1317  */
1318 struct file_list *flist_new(void)
1319 {
1320         struct file_list *flist;
1321
1322         flist = new(struct file_list);
1323         if (!flist)
1324                 out_of_memory("send_file_list");
1325
1326         flist->count = 0;
1327         flist->malloced = 0;
1328         flist->files = NULL;
1329
1330 #if ARENA_SIZE > 0
1331         flist->string_area = string_area_new(0);
1332 #else
1333         flist->string_area = NULL;
1334 #endif
1335         return flist;
1336 }
1337
1338 /*
1339  * free up all elements in a flist
1340  */
1341 void flist_free(struct file_list *flist)
1342 {
1343         int i;
1344         for (i = 1; i < flist->count; i++) {
1345                 if (!flist->string_area)
1346                         free_file(flist->files[i]);
1347                 free(flist->files[i]);
1348         }
1349         /* FIXME: I don't think we generally need to blank the flist
1350          * since it's about to be freed.  This will just cause more
1351          * memory traffic.  If you want a freed-memory debugger, you
1352          * know where to get it. */
1353         memset((char *) flist->files, 0,
1354                sizeof(flist->files[0]) * flist->count);
1355         free(flist->files);
1356         if (flist->string_area)
1357                 string_area_free(flist->string_area);
1358         memset((char *) flist, 0, sizeof(*flist));
1359         free(flist);
1360 }
1361
1362
1363 /*
1364  * This routine ensures we don't have any duplicate names in our file list.
1365  * duplicate names can cause corruption because of the pipelining
1366  */
1367 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1368 {
1369         int i, prev_i = 0;
1370
1371         if (!flist || flist->count == 0)
1372                 return;
1373
1374         qsort(flist->files, flist->count,
1375               sizeof(flist->files[0]), (int (*)()) file_compare);
1376
1377         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1378                 if (flist->files[i]->basename) {
1379                         prev_i = i;
1380                         break;
1381                 }
1382         }
1383         while (++i < flist->count) {
1384                 if (!flist->files[i]->basename)
1385                         continue;
1386                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1387                         if (verbose > 1 && !am_server) {
1388                                 rprintf(FINFO,
1389                                         "removing duplicate name %s from file list %d\n",
1390                                         f_name(flist->files[i]), i);
1391                         }
1392                         /* Make sure that if we unduplicate '.', that we don't
1393                          * lose track of a user-specified starting point (or
1394                          * else deletions will mysteriously fail with -R). */
1395                         if (flist->files[i]->flags & FLAG_DELETE)
1396                                 flist->files[prev_i]->flags |= FLAG_DELETE;
1397                         /* it's not great that the flist knows the semantics of
1398                          * the file memory usage, but i'd rather not add a flag
1399                          * byte to that struct.
1400                          * XXX can i use a bit in the flags field? */
1401                         if (flist->string_area)
1402                                 flist->files[i][0] = null_file;
1403                         else
1404                                 free_file(flist->files[i]);
1405                 } else
1406                         prev_i = i;
1407         }
1408
1409         if (strip_root) {
1410                 /* we need to strip off the root directory in the case
1411                    of relative paths, but this must be done _after_
1412                    the sorting phase */
1413                 for (i = 0; i < flist->count; i++) {
1414                         if (flist->files[i]->dirname &&
1415                             flist->files[i]->dirname[0] == '/') {
1416                                 memmove(&flist->files[i]->dirname[0],
1417                                         &flist->files[i]->dirname[1],
1418                                         strlen(flist->files[i]->dirname));
1419                         }
1420
1421                         if (flist->files[i]->dirname &&
1422                             !flist->files[i]->dirname[0]) {
1423                                 flist->files[i]->dirname = NULL;
1424                         }
1425                 }
1426         }
1427
1428         if (verbose <= 3)
1429                 return;
1430
1431         for (i = 0; i < flist->count; i++) {
1432                 rprintf(FINFO, "[%ld] i=%d %s %s mode=0%o len=%.0f\n",
1433                         (long) getpid(), i,
1434                         NS(flist->files[i]->dirname),
1435                         NS(flist->files[i]->basename),
1436                         (int) flist->files[i]->mode,
1437                         (double) flist->files[i]->length);
1438         }
1439 }
1440
1441
1442 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1443
1444 /* Compare the names of two file_struct entities, just like strcmp()
1445  * would do if it were operating on the joined strings.  We assume
1446  * that there are no 0-length strings.
1447  */
1448 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1449 {
1450         int dif;
1451         const uchar *c1, *c2;
1452         enum fnc_state state1, state2;
1453
1454         if (!f1 || !f1->basename) {
1455                 if (!f2 || !f2->basename)
1456                         return 0;
1457                 return -1;
1458         }
1459         if (!f2 || !f2->basename)
1460                 return 1;
1461
1462         if (!(c1 = (uchar*)f1->dirname)) {
1463                 state1 = fnc_BASE;
1464                 c1 = (uchar*)f1->basename;
1465         } else
1466                 state1 = fnc_DIR;
1467         if (!(c2 = (uchar*)f2->dirname)) {
1468                 state2 = fnc_BASE;
1469                 c2 = (uchar*)f2->basename;
1470         } else
1471                 state2 = fnc_DIR;
1472
1473         while (1) {
1474                 if ((dif = (int)*c1 - (int)*c2) != 0)
1475                         break;
1476                 if (!*++c1) {
1477                         switch (state1) {
1478                         case fnc_DIR:
1479                                 state1 = fnc_SLASH;
1480                                 c1 = (uchar*)"/";
1481                                 break;
1482                         case fnc_SLASH:
1483                                 state1 = fnc_BASE;
1484                                 c1 = (uchar*)f1->basename;
1485                                 break;
1486                         case fnc_BASE:
1487                                 break;
1488                         }
1489                 }
1490                 if (!*++c2) {
1491                         switch (state2) {
1492                         case fnc_DIR:
1493                                 state2 = fnc_SLASH;
1494                                 c2 = (uchar*)"/";
1495                                 break;
1496                         case fnc_SLASH:
1497                                 state2 = fnc_BASE;
1498                                 c2 = (uchar*)f2->basename;
1499                                 break;
1500                         case fnc_BASE:
1501                                 if (!*c1)
1502                                         return 0;
1503                                 break;
1504                         }
1505                 }
1506         }
1507
1508         return dif;
1509 }
1510
1511
1512 /* Return a copy of the full filename of a flist entry, using the indicated
1513  * buffer.
1514  */
1515 char *f_name_to(struct file_struct *f, char *fbuf, int bsize)
1516 {
1517         if (!f || !f->basename)
1518                 return NULL;
1519
1520         if (f->dirname) {
1521                 int off = strlcpy(fbuf, f->dirname, bsize);
1522                 off += strlcpy(fbuf + off, "/", bsize - off);
1523                 strlcpy(fbuf + off, f->basename, bsize - off);
1524         } else
1525                 strlcpy(fbuf, f->basename, bsize);
1526         return fbuf;
1527 }
1528
1529
1530 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1531  */
1532 char *f_name(struct file_struct *f)
1533 {
1534         static char names[5][MAXPATHLEN];
1535         static unsigned int n;
1536
1537         n = (n + 1) % (sizeof names / sizeof names[0]);
1538
1539         return f_name_to(f, names[n], sizeof names[0]);
1540 }