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  * @sa http://lists.samba.org/pipermail/rsync/2000-June/002351.html
  25  *
  26  **/
  27
  28 #include "rsync.h"
  29
  30 extern struct stats stats;
  31
  32 extern int verbose;
  33 extern int do_progress;
  34 extern int am_server;
  35 extern int always_checksum;
  36 extern int module_id;
  37 extern int ignore_errors;
  38
  39 extern int cvs_exclude;
  40
  41 extern int recurse;
  42 extern char curr_dir[MAXPATHLEN];
  43 extern char *files_from;
  44 extern int filesfrom_fd;
  45
  46 extern int one_file_system;
  47 extern int make_backups;
  48 extern int preserve_links;
  49 extern int preserve_hard_links;
  50 extern int preserve_perms;
  51 extern int preserve_devices;
  52 extern int preserve_uid;
  53 extern int preserve_gid;
  54 extern int preserve_times;
  55 extern int relative_paths;
  56 extern int implied_dirs;
  57 extern int copy_links;
  58 extern int copy_unsafe_links;
  59 extern int protocol_version;
  60 extern int sanitize_paths;
  61
  62 extern int read_batch;
  63 extern int write_batch;
  64
  65 extern struct exclude_struct **exclude_list;
  66 extern struct exclude_struct **server_exclude_list;
  67 extern struct exclude_struct **local_exclude_list;
  68
  69 int io_error;
  70
  71 static char empty_sum[MD4_SUM_LENGTH];
  72
  73 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  74
  75
  76 static int show_filelist_p(void)
  77 {
  78         return verbose && (recurse || files_from) && !am_server;
  79 }
  80
  81 static void start_filelist_progress(char *kind)
  82 {
  83         rprintf(FINFO, "%s ... ", kind);
  84         if ((verbose > 1) || do_progress)
  85                 rprintf(FINFO, "\n");
  86         rflush(FINFO);
  87 }
  88
  89
  90 static void emit_filelist_progress(const struct file_list *flist)
  91 {
  92         rprintf(FINFO, " %d files...\r", flist->count);
  93 }
  94
  95
  96 static void maybe_emit_filelist_progress(const struct file_list *flist)
  97 {
  98         if (do_progress && show_filelist_p() && ((flist->count % 100) == 0))
  99                 emit_filelist_progress(flist);
 100 }
 101
 102
 103 static void finish_filelist_progress(const struct file_list *flist)
 104 {
 105         if (do_progress) {
 106                 /* This overwrites the progress line */
 107                 rprintf(FINFO, "%d file%sto consider\n",
 108                         flist->count, flist->count == 1 ? " " : "s ");
 109         } else
 110                 rprintf(FINFO, "done\n");
 111 }
 112
 113 void show_flist_stats(void)
 114 {
 115         /* Nothing yet */
 116 }
 117
 118
 119 static void list_file_entry(struct file_struct *f)
 120 {
 121         char perms[11];
 122
 123         if (!f->basename)
 124                 /* this can happen if duplicate names were removed */
 125                 return;
 126
 127         permstring(perms, f->mode);
 128
 129 #if SUPPORT_LINKS
 130         if (preserve_links && S_ISLNK(f->mode)) {
 131                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 132                         perms,
 133                         (double) f->length, timestring(f->modtime),
 134                         f_name(f), f->u.link);
 135         } else
 136 #endif
 137                 rprintf(FINFO, "%s %11.0f %s %s\n",
 138                         perms,
 139                         (double) f->length, timestring(f->modtime),
 140                         f_name(f));
 141 }
 142
 143
 144 /**
 145  * Stat either a symlink or its referent, depending on the settings of
 146  * copy_links, copy_unsafe_links, etc.
 147  *
 148  * @retval -1 on error
 149  *
 150  * @retval 0 for success
 151  *
 152  * @post If @p path is a symlink, then @p linkbuf (of size @c
 153  * MAXPATHLEN) contains the symlink target.
 154  *
 155  * @post @p buffer contains information about the link or the
 156  * referrent as appropriate, if they exist.
 157  **/
 158 int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 159 {
 160 #if SUPPORT_LINKS
 161         if (copy_links)
 162                 return do_stat(path, buffer);
 163         if (do_lstat(path, buffer) == -1)
 164                 return -1;
 165         if (S_ISLNK(buffer->st_mode)) {
 166                 int l = readlink((char *) path, linkbuf, MAXPATHLEN - 1);
 167                 if (l == -1)
 168                         return -1;
 169                 linkbuf[l] = 0;
 170                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 171                         if (verbose > 1) {
 172                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 173                                         path, linkbuf);
 174                         }
 175                         return do_stat(path, buffer);
 176                 }
 177         }
 178         return 0;
 179 #else
 180         return do_stat(path, buffer);
 181 #endif
 182 }
 183
 184 int link_stat(const char *path, STRUCT_STAT * buffer)
 185 {
 186 #if SUPPORT_LINKS
 187         if (copy_links)
 188                 return do_stat(path, buffer);
 189         return do_lstat(path, buffer);
 190 #else
 191         return do_stat(path, buffer);
 192 #endif
 193 }
 194
 195 /*
 196  * This function is used to check if a file should be included/excluded
 197  * from the list of files based on its name and type etc.  The value of
 198  * exclude_level is set to either SERVER_EXCLUDES or ALL_EXCLUDES.
 199  */
 200 static int check_exclude_file(char *fname, int is_dir, int exclude_level)
 201 {
 202 #if 0 /* This currently never happens, so avoid a useless compare. */
 203         if (exclude_level == NO_EXCLUDES)
 204                 return 0;
 205 #endif
 206         if (fname) {
 207                 /* never exclude '.', even if somebody does --exclude '*' */
 208                 if (fname[0] == '.' && !fname[1])
 209                         return 0;
 210                 /* Handle the -R version of the '.' dir. */
 211                 if (fname[0] == '/') {
 212                         int len = strlen(fname);
 213                         if (fname[len-1] == '.' && fname[len-2] == '/')
 214                                 return 0;
 215                 }
 216         }
 217         if (server_exclude_list
 218          && check_exclude(server_exclude_list, fname, is_dir))
 219                 return 1;
 220         if (exclude_level != ALL_EXCLUDES)
 221                 return 0;
 222         if (exclude_list && check_exclude(exclude_list, fname, is_dir))
 223                 return 1;
 224         if (local_exclude_list
 225          && check_exclude(local_exclude_list, fname, is_dir))
 226                 return 1;
 227         return 0;
 228 }
 229
 230 /* used by the one_file_system code */
 231 static dev_t filesystem_dev;
 232
 233 static void set_filesystem(char *fname)
 234 {
 235         STRUCT_STAT st;
 236         if (link_stat(fname, &st) != 0)
 237                 return;
 238         filesystem_dev = st.st_dev;
 239 }
 240
 241
 242 static int to_wire_mode(mode_t mode)
 243 {
 244 #if SUPPORT_LINKS
 245         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 246                 return (mode & ~(_S_IFMT)) | 0120000;
 247 #endif
 248         return (int) mode;
 249 }
 250
 251 static mode_t from_wire_mode(int mode)
 252 {
 253         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 254                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 255         return (mode_t) mode;
 256 }
 257
 258
 259 static void send_directory(int f, struct file_list *flist, char *dir);
 260
 261 static char *flist_dir;
 262 static int flist_dir_len;
 263
 264
 265 /**
 266  * Make sure @p flist is big enough to hold at least @p flist->count
 267  * entries.
 268  **/
 269 static void flist_expand(struct file_list *flist)
 270 {
 271         if (flist->count >= flist->malloced) {
 272                 void *new_ptr;
 273
 274                 if (flist->malloced < 1000)
 275                         flist->malloced += 1000;
 276                 else
 277                         flist->malloced *= 2;
 278
 279                 if (flist->files) {
 280                         new_ptr = realloc_array(flist->files,
 281                                                 struct file_struct *,
 282                                                 flist->malloced);
 283                 } else {
 284                         new_ptr = new_array(struct file_struct *,
 285                                             flist->malloced);
 286                 }
 287
 288                 if (verbose >= 2) {
 289                         rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 290                                 who_am_i(),
 291                                 (double)sizeof(flist->files[0])
 292                                 * flist->malloced,
 293                                 (new_ptr == flist->files) ? " not" : "");
 294                 }
 295
 296                 flist->files = (struct file_struct **) new_ptr;
 297
 298                 if (!flist->files)
 299                         out_of_memory("flist_expand");
 300         }
 301 }
 302
 303 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 304 {
 305         unsigned short flags;
 306         static time_t modtime;
 307         static mode_t mode;
 308         static DEV64_T rdev, rdev_high;
 309         static DEV64_T dev;
 310         static uid_t uid;
 311         static gid_t gid;
 312         static char lastname[MAXPATHLEN];
 313         char *fname, fbuf[MAXPATHLEN];
 314         int l1, l2;
 315
 316         if (f == -1)
 317                 return;
 318
 319         if (!file) {
 320                 write_byte(f, 0);
 321                 modtime = 0, mode = 0;
 322                 rdev = 0, rdev_high = 0, dev = 0;
 323                 uid = 0, gid = 0;
 324                 *lastname = '\0';
 325                 return;
 326         }
 327
 328         io_write_phase = "send_file_entry";
 329
 330         fname = f_name_to(file, fbuf);
 331
 332         flags = base_flags;
 333
 334         if (file->mode == mode)
 335                 flags |= XMIT_SAME_MODE;
 336         else
 337                 mode = file->mode;
 338         if (preserve_devices) {
 339                 if (protocol_version < 28) {
 340                         if (IS_DEVICE(mode)) {
 341                                 if (file->u.rdev == rdev) {
 342                                         /* Set both flags to simplify the test
 343                                          * when writing the data. */
 344                                         flags |= XMIT_SAME_RDEV_pre28
 345                                                | XMIT_SAME_HIGH_RDEV;
 346                                 } else
 347                                         rdev = file->u.rdev;
 348                         } else
 349                                 rdev = 0;
 350                 } else if (IS_DEVICE(mode)) {
 351                         if ((file->u.rdev & ~0xFF) == rdev_high)
 352                                 flags |= XMIT_SAME_HIGH_RDEV;
 353                         else {
 354                                 rdev = file->u.rdev;
 355                                 rdev_high = rdev & ~0xFF;
 356                         }
 357                 }
 358         }
 359         if (file->uid == uid)
 360                 flags |= XMIT_SAME_UID;
 361         else
 362                 uid = file->uid;
 363         if (file->gid == gid)
 364                 flags |= XMIT_SAME_GID;
 365         else
 366                 gid = file->gid;
 367         if (file->modtime == modtime)
 368                 flags |= XMIT_SAME_TIME;
 369         else
 370                 modtime = file->modtime;
 371
 372 #if SUPPORT_HARD_LINKS
 373         if (file->link_u.idev) {
 374                 if (file->F_DEV == dev) {
 375                         if (protocol_version >= 28)
 376                                 flags |= XMIT_SAME_DEV;
 377                 } else
 378                         dev = file->F_DEV;
 379                 flags |= XMIT_HAS_IDEV_DATA;
 380         }
 381 #endif
 382
 383         for (l1 = 0;
 384              lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 385              l1++) {}
 386         l2 = strlen(fname+l1);
 387
 388         if (l1 > 0)
 389                 flags |= XMIT_SAME_NAME;
 390         if (l2 > 255)
 391                 flags |= XMIT_LONG_NAME;
 392
 393         /* We must make sure we don't send a zero flag byte or the
 394          * other end will terminate the flist transfer.  Note that
 395          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 396          * it's harmless way to add a bit to the first flag byte. */
 397         if (protocol_version >= 28) {
 398                 if (!flags && !S_ISDIR(mode))
 399                         flags |= XMIT_TOP_DIR;
 400                 if ((flags & 0xFF00) || !flags) {
 401                         flags |= XMIT_EXTENDED_FLAGS;
 402                         write_byte(f, flags);
 403                         write_byte(f, flags >> 8);
 404                 } else
 405                         write_byte(f, flags);
 406         } else {
 407                 if (!(flags & 0xFF) && !S_ISDIR(mode))
 408                         flags |= XMIT_TOP_DIR;
 409                 if (!(flags & 0xFF))
 410                         flags |= XMIT_LONG_NAME;
 411                 write_byte(f, flags);
 412         }
 413         if (flags & XMIT_SAME_NAME)
 414                 write_byte(f, l1);
 415         if (flags & XMIT_LONG_NAME)
 416                 write_int(f, l2);
 417         else
 418                 write_byte(f, l2);
 419         write_buf(f, fname + l1, l2);
 420
 421         write_longint(f, file->length);
 422         if (!(flags & XMIT_SAME_TIME))
 423                 write_int(f, modtime);
 424         if (!(flags & XMIT_SAME_MODE))
 425                 write_int(f, to_wire_mode(mode));
 426         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 427                 add_uid(uid);
 428                 write_int(f, uid);
 429         }
 430         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 431                 add_gid(gid);
 432                 write_int(f, gid);
 433         }
 434         if (preserve_devices && IS_DEVICE(mode)) {
 435                 /* If XMIT_SAME_HIGH_RDEV is off, XMIT_SAME_RDEV_pre28 is
 436                  * also off. */
 437                 if (!(flags & XMIT_SAME_HIGH_RDEV))
 438                         write_int(f, rdev);
 439                 else if (protocol_version >= 28)
 440                         write_byte(f, rdev);
 441         }
 442
 443 #if SUPPORT_LINKS
 444         if (preserve_links && S_ISLNK(mode)) {
 445                 int len = strlen(file->u.link);
 446                 write_int(f, len);
 447                 write_buf(f, file->u.link, len);
 448         }
 449 #endif
 450
 451 #if SUPPORT_HARD_LINKS
 452         if (flags & XMIT_HAS_IDEV_DATA) {
 453                 if (protocol_version < 26) {
 454                         /* 32-bit dev_t and ino_t */
 455                         write_int(f, dev);
 456                         write_int(f, file->F_INODE);
 457                 } else {
 458                         /* 64-bit dev_t and ino_t */
 459                         if (!(flags & XMIT_SAME_DEV))
 460                                 write_longint(f, dev);
 461                         write_longint(f, file->F_INODE);
 462                 }
 463         }
 464 #endif
 465
 466         if (always_checksum) {
 467                 char *sum;
 468                 if (S_ISREG(mode))
 469                         sum = file->u.sum;
 470                 else if (protocol_version < 28) {
 471                         /* Prior to 28, we sent a useless set of nulls. */
 472                         sum = empty_sum;
 473                 } else
 474                         sum = NULL;
 475                 if (sum) {
 476                         write_buf(f, sum, protocol_version < 21? 2
 477                                                         : MD4_SUM_LENGTH);
 478                 }
 479         }
 480
 481         strlcpy(lastname, fname, MAXPATHLEN);
 482
 483         io_write_phase = "unknown";
 484 }
 485
 486
 487
 488 void receive_file_entry(struct file_struct **fptr, unsigned short flags, int f)
 489 {
 490         static time_t modtime;
 491         static mode_t mode;
 492         static DEV64_T rdev, rdev_high;
 493         static DEV64_T dev;
 494         static uid_t uid;
 495         static gid_t gid;
 496         static char lastname[MAXPATHLEN], *lastdir;
 497         static int lastdir_len = -1;
 498         char thisname[MAXPATHLEN];
 499         unsigned int l1 = 0, l2 = 0;
 500         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 501         OFF_T file_length;
 502         char *basename, *dirname, *bp;
 503         struct file_struct *file;
 504
 505         if (!fptr) {
 506                 modtime = 0, mode = 0;
 507                 rdev = 0, rdev_high = 0, dev = 0;
 508                 uid = 0, gid = 0;
 509                 *lastname = '\0';
 510                 return;
 511         }
 512
 513         if (flags & XMIT_SAME_NAME)
 514                 l1 = read_byte(f);
 515
 516         if (flags & XMIT_LONG_NAME)
 517                 l2 = read_int(f);
 518         else
 519                 l2 = read_byte(f);
 520
 521         if (l2 >= MAXPATHLEN - l1) {
 522                 rprintf(FERROR,
 523                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 524                         flags, l1, l2, lastname);
 525                 overflow("receive_file_entry");
 526         }
 527
 528         strlcpy(thisname, lastname, l1 + 1);
 529         read_sbuf(f, &thisname[l1], l2);
 530         thisname[l1 + l2] = 0;
 531
 532         strlcpy(lastname, thisname, MAXPATHLEN);
 533
 534         clean_fname(thisname);
 535
 536         if (sanitize_paths)
 537                 sanitize_path(thisname, NULL);
 538
 539         if ((basename = strrchr(thisname, '/')) != NULL) {
 540                 dirname_len = ++basename - thisname; /* counts future '\0' */
 541                 if (lastdir_len == dirname_len - 1
 542                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 543                         dirname = lastdir;
 544                         dirname_len = 0; /* indicates no copy is needed */
 545                 } else
 546                         dirname = thisname;
 547         } else {
 548                 basename = thisname;
 549                 dirname = NULL;
 550                 dirname_len = 0;
 551         }
 552         basename_len = strlen(basename) + 1; /* count the '\0' */
 553
 554         file_length = read_longint(f);
 555         if (!(flags & XMIT_SAME_TIME))
 556                 modtime = (time_t)read_int(f);
 557         if (!(flags & XMIT_SAME_MODE))
 558                 mode = from_wire_mode(read_int(f));
 559
 560         if (preserve_uid && !(flags & XMIT_SAME_UID))
 561                 uid = (uid_t)read_int(f);
 562         if (preserve_gid && !(flags & XMIT_SAME_GID))
 563                 gid = (gid_t)read_int(f);
 564
 565         if (preserve_devices) {
 566                 if (protocol_version < 28) {
 567                         if (IS_DEVICE(mode)) {
 568                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 569                                         rdev = (DEV64_T)read_int(f);
 570                         } else
 571                                 rdev = 0;
 572                 } else if (IS_DEVICE(mode)) {
 573                         if (!(flags & XMIT_SAME_HIGH_RDEV)) {
 574                                 rdev = (DEV64_T)read_int(f);
 575                                 rdev_high = rdev & ~0xFF;
 576                         } else
 577                                 rdev = rdev_high | (DEV64_T)read_byte(f);
 578                 }
 579         }
 580
 581 #if SUPPORT_LINKS
 582         if (preserve_links && S_ISLNK(mode)) {
 583                 linkname_len = read_int(f) + 1; /* count the '\0' */
 584                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 585                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 586                                 linkname_len - 1);
 587                         overflow("receive_file_entry");
 588                 }
 589         }
 590         else
 591 #endif
 592                 linkname_len = 0;
 593
 594         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 595
 596         alloc_len = sizeof file[0] + dirname_len + basename_len
 597                   + linkname_len + sum_len;
 598         if (!(bp = new_array(char, alloc_len)))
 599                 out_of_memory("receive_file_entry");
 600         file = *fptr = (struct file_struct *)bp;
 601         memset(bp, 0, sizeof file[0]);
 602         bp += sizeof file[0];
 603
 604         file->flags = flags & XMIT_TOP_DIR ? FLAG_TOP_DIR : 0;
 605         file->modtime = modtime;
 606         file->length = file_length;
 607         file->mode = mode;
 608         file->uid = uid;
 609         file->gid = gid;
 610
 611         if (dirname_len) {
 612                 file->dirname = lastdir = bp;
 613                 lastdir_len = dirname_len - 1;
 614                 memcpy(bp, dirname, dirname_len - 1);
 615                 bp += dirname_len;
 616                 bp[-1] = '\0';
 617         } else if (dirname)
 618                 file->dirname = dirname;
 619
 620         file->basename = bp;
 621         memcpy(bp, basename, basename_len);
 622         bp += basename_len;
 623
 624         if (preserve_devices && IS_DEVICE(mode))
 625                 file->u.rdev = rdev;
 626
 627 #if SUPPORT_LINKS
 628         if (linkname_len) {
 629                 file->u.link = bp;
 630                 read_sbuf(f, bp, linkname_len - 1);
 631                 if (sanitize_paths)
 632                         sanitize_path(bp, lastdir);
 633                 bp += linkname_len;
 634         }
 635 #endif
 636
 637 #if SUPPORT_HARD_LINKS
 638         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 639                 flags |= XMIT_HAS_IDEV_DATA;
 640         if (flags & XMIT_HAS_IDEV_DATA) {
 641                 if (!(file->link_u.idev = new(struct idev)))
 642                         out_of_memory("file inode data");
 643                 if (protocol_version < 26) {
 644                         dev = read_int(f);
 645                         file->F_INODE = read_int(f);
 646                 } else {
 647                         if (!(flags & XMIT_SAME_DEV))
 648                                 dev = read_longint(f);
 649                         file->F_INODE = read_longint(f);
 650                 }
 651                 file->F_DEV = dev;
 652         }
 653 #endif
 654
 655         if (always_checksum) {
 656                 char *sum;
 657                 if (sum_len) {
 658                         file->u.sum = sum = bp;
 659                         /*bp += sum_len;*/
 660                 } else if (protocol_version < 28) {
 661                         /* Prior to 28, we get a useless set of nulls. */
 662                         sum = empty_sum;
 663                 } else
 664                         sum = NULL;
 665                 if (sum) {
 666                         read_buf(f, sum, protocol_version < 21? 2
 667                                                 : MD4_SUM_LENGTH);
 668                 }
 669         }
 670
 671         if (!preserve_perms) {
 672                 extern int orig_umask;
 673                 /* set an appropriate set of permissions based on original
 674                  * permissions and umask. This emulates what GNU cp does */
 675                 file->mode &= ~orig_umask;
 676         }
 677 }
 678
 679
 680 /**
 681  * Create a file_struct for a named file by reading its stat()
 682  * information and performing extensive checks against global
 683  * options.
 684  *
 685  * @return the new file, or NULL if there was an error or this file
 686  * should be excluded.
 687  *
 688  * @todo There is a small optimization opportunity here to avoid
 689  * stat()ing the file in some circumstances, which has a certain cost.
 690  * We are called immediately after doing readdir(), and so we may
 691  * already know the d_type of the file.  We could for example avoid
 692  * statting directories if we're not recursing, but this is not a very
 693  * important case.  Some systems may not have d_type.
 694  **/
 695 struct file_struct *make_file(char *fname, int exclude_level)
 696 {
 697         static char *lastdir;
 698         static int lastdir_len = -1;
 699         struct file_struct *file;
 700         STRUCT_STAT st;
 701         char sum[SUM_LENGTH];
 702         char thisname[MAXPATHLEN];
 703         char linkname[MAXPATHLEN];
 704         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 705         char *basename, *dirname, *bp;
 706         unsigned short flags = 0;
 707
 708         if (strlcpy(thisname, fname, sizeof thisname)
 709             >= sizeof thisname - flist_dir_len) {
 710                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 711                 return NULL;
 712         }
 713         clean_fname(thisname);
 714         if (sanitize_paths)
 715                 sanitize_path(thisname, NULL);
 716
 717         memset(sum, 0, SUM_LENGTH);
 718
 719         if (readlink_stat(thisname, &st, linkname) != 0) {
 720                 int save_errno = errno;
 721                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
 722                         /* either symlink pointing nowhere or file that
 723                          * was removed during rsync run; see if excluded
 724                          * before reporting an error */
 725                         if (check_exclude_file(thisname, 0, exclude_level)) {
 726                                 /* file is excluded anyway, ignore silently */
 727                                 return NULL;
 728                         }
 729                 }
 730                 io_error |= IOERR_GENERAL;
 731                 rprintf(FERROR, "readlink %s failed: %s\n",
 732                         full_fname(thisname), strerror(save_errno));
 733                 return NULL;
 734         }
 735
 736         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 737         if (exclude_level == NO_EXCLUDES)
 738                 goto skip_excludes;
 739
 740         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 741                 rprintf(FINFO, "skipping directory %s\n", thisname);
 742                 return NULL;
 743         }
 744
 745         if (one_file_system && st.st_dev != filesystem_dev) {
 746                 /* We allow a directory though to preserve the mount point.
 747                  * However, flag it so that we don't recurse. */
 748                 if (!S_ISDIR(st.st_mode))
 749                         return NULL;
 750                 flags |= FLAG_MOUNT_POINT;
 751         }
 752
 753         if (check_exclude_file(thisname, S_ISDIR(st.st_mode) != 0, exclude_level))
 754                 return NULL;
 755
 756         if (lp_ignore_nonreadable(module_id) && access(thisname, R_OK) != 0)
 757                 return NULL;
 758
 759       skip_excludes:
 760
 761         if (verbose > 2) {
 762                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 763                         who_am_i(), thisname, exclude_level);
 764         }
 765
 766         if ((basename = strrchr(thisname, '/')) != NULL) {
 767                 dirname_len = ++basename - thisname; /* counts future '\0' */
 768                 if (lastdir_len == dirname_len - 1
 769                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 770                         dirname = lastdir;
 771                         dirname_len = 0; /* indicates no copy is needed */
 772                 } else
 773                         dirname = thisname;
 774         } else {
 775                 basename = thisname;
 776                 dirname = NULL;
 777                 dirname_len = 0;
 778         }
 779         basename_len = strlen(basename) + 1; /* count the '\0' */
 780
 781 #if SUPPORT_LINKS
 782         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 783 #else
 784         linkname_len = 0;
 785 #endif
 786
 787         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
 788
 789         alloc_len = sizeof file[0] + dirname_len + basename_len
 790                   + linkname_len + sum_len;
 791         if (!(bp = new_array(char, alloc_len)))
 792                 out_of_memory("receive_file_entry");
 793         file = (struct file_struct *)bp;
 794         memset(bp, 0, sizeof file[0]);
 795         bp += sizeof file[0];
 796
 797         file->flags = flags;
 798         file->modtime = st.st_mtime;
 799         file->length = st.st_size;
 800         file->mode = st.st_mode;
 801         file->uid = st.st_uid;
 802         file->gid = st.st_gid;
 803
 804         if (dirname_len) {
 805                 file->dirname = lastdir = bp;
 806                 lastdir_len = dirname_len - 1;
 807                 memcpy(bp, dirname, dirname_len - 1);
 808                 bp += dirname_len;
 809                 bp[-1] = '\0';
 810         } else if (dirname)
 811                 file->dirname = dirname;
 812
 813         file->basename = bp;
 814         memcpy(bp, basename, basename_len);
 815         bp += basename_len;
 816
 817 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 818         if (preserve_devices && IS_DEVICE(st.st_mode))
 819                 file->u.rdev = st.st_rdev;
 820 #endif
 821
 822 #if SUPPORT_LINKS
 823         if (linkname_len) {
 824                 file->u.link = bp;
 825                 memcpy(bp, linkname, linkname_len);
 826                 bp += linkname_len;
 827         }
 828 #endif
 829
 830 #if SUPPORT_HARD_LINKS
 831         if (preserve_hard_links) {
 832                 if (protocol_version < 28 ? S_ISREG(st.st_mode)
 833                     : !S_ISDIR(st.st_mode) && st.st_nlink > 1) {
 834                         if (!(file->link_u.idev = new(struct idev)))
 835                                 out_of_memory("file inode data");
 836                         file->F_DEV = st.st_dev;
 837                         file->F_INODE = st.st_ino;
 838                 }
 839         }
 840 #endif
 841
 842         if (sum_len) {
 843                 file->u.sum = bp;
 844                 file_checksum(thisname, bp, st.st_size);
 845                 /*bp += sum_len;*/
 846         }
 847
 848         file->basedir = flist_dir;
 849
 850         if (!S_ISDIR(st.st_mode))
 851                 stats.total_size += st.st_size;
 852
 853         return file;
 854 }
 855
 856
 857 void send_file_name(int f, struct file_list *flist, char *fname,
 858                     int recursive, unsigned short base_flags)
 859 {
 860         struct file_struct *file;
 861         char fbuf[MAXPATHLEN];
 862         extern int delete_excluded;
 863
 864         /* f is set to -1 when calculating deletion file list */
 865         file = make_file(fname,
 866                          f == -1 && delete_excluded? SERVER_EXCLUDES
 867                                                    : ALL_EXCLUDES);
 868
 869         if (!file)
 870                 return;
 871
 872         maybe_emit_filelist_progress(flist);
 873
 874         flist_expand(flist);
 875
 876         if (write_batch)
 877                 file->flags |= FLAG_TOP_DIR;
 878
 879         if (file->basename[0]) {
 880                 flist->files[flist->count++] = file;
 881                 send_file_entry(file, f, base_flags);
 882         }
 883
 884         if (recursive && S_ISDIR(file->mode)
 885             && !(file->flags & FLAG_MOUNT_POINT)) {
 886                 struct exclude_struct **last_exclude_list = local_exclude_list;
 887                 send_directory(f, flist, f_name_to(file, fbuf));
 888                 local_exclude_list = last_exclude_list;
 889                 return;
 890         }
 891 }
 892
 893
 894 static void send_directory(int f, struct file_list *flist, char *dir)
 895 {
 896         DIR *d;
 897         struct dirent *di;
 898         char fname[MAXPATHLEN];
 899         unsigned int offset;
 900         char *p;
 901
 902         d = opendir(dir);
 903         if (!d) {
 904                 io_error |= IOERR_GENERAL;
 905                 rprintf(FERROR, "opendir %s failed: %s\n",
 906                         full_fname(dir), strerror(errno));
 907                 return;
 908         }
 909
 910         offset = strlcpy(fname, dir, MAXPATHLEN);
 911         p = fname + offset;
 912         if (offset >= MAXPATHLEN || p[-1] != '/') {
 913                 if (offset >= MAXPATHLEN - 1) {
 914                         io_error |= IOERR_GENERAL;
 915                         rprintf(FERROR, "skipping long-named directory: %s\n",
 916                                 full_fname(fname));
 917                         closedir(d);
 918                         return;
 919                 }
 920                 *p++ = '/';
 921                 offset++;
 922         }
 923
 924         local_exclude_list = NULL;
 925
 926         if (cvs_exclude) {
 927                 if (strlcpy(p, ".cvsignore", MAXPATHLEN - offset)
 928                     < MAXPATHLEN - offset)
 929                         add_exclude_file(&local_exclude_list,fname,MISSING_OK,ADD_EXCLUDE);
 930                 else {
 931                         io_error |= IOERR_GENERAL;
 932                         rprintf(FINFO,
 933                                 "cannot cvs-exclude in long-named directory %s\n",
 934                                 full_fname(fname));
 935                 }
 936         }
 937
 938         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 939                 char *dname = d_name(di);
 940                 if (dname[0] == '.' && (dname[1] == '\0'
 941                     || (dname[1] == '.' && dname[2] == '\0')))
 942                         continue;
 943                 if (strlcpy(p, dname, MAXPATHLEN - offset) < MAXPATHLEN - offset)
 944                         send_file_name(f, flist, fname, recurse, 0);
 945                 else {
 946                         io_error |= IOERR_GENERAL;
 947                         rprintf(FINFO,
 948                                 "cannot send long-named file %s\n",
 949                                 full_fname(fname));
 950                 }
 951         }
 952         if (errno) {
 953                 io_error |= IOERR_GENERAL;
 954                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
 955                         dir, errno, strerror(errno));
 956         }
 957
 958         if (local_exclude_list)
 959                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
 960
 961         closedir(d);
 962 }
 963
 964
 965 /**
 966  * The delete_files() function in receiver.c sets f to -1 so that we just
 967  * construct the file list in memory without sending it over the wire.  It
 968  * also has the side-effect of ignoring user-excludes if delete_excluded
 969  * is set (so that the delete list includes user-excluded files).
 970  **/
 971 struct file_list *send_file_list(int f, int argc, char *argv[])
 972 {
 973         int l;
 974         STRUCT_STAT st;
 975         char *p, *dir, olddir[sizeof curr_dir];
 976         char lastpath[MAXPATHLEN] = "";
 977         struct file_list *flist;
 978         int64 start_write;
 979         int use_ff_fd = 0;
 980
 981         if (show_filelist_p() && f != -1)
 982                 start_filelist_progress("building file list");
 983
 984         start_write = stats.total_written;
 985
 986         flist = flist_new();
 987
 988         if (f != -1) {
 989                 io_start_buffering_out(f);
 990                 if (filesfrom_fd >= 0) {
 991                         if (argv[0] && !push_dir(argv[0])) {
 992                                 rprintf(FERROR, "push_dir %s failed: %s\n",
 993                                         full_fname(argv[0]), strerror(errno));
 994                                 exit_cleanup(RERR_FILESELECT);
 995                         }
 996                         use_ff_fd = 1;
 997                 }
 998         }
 999
1000         while (1) {
1001                 char fname2[MAXPATHLEN];
1002                 char *fname = fname2;
1003
1004                 if (use_ff_fd) {
1005                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1006                                 break;
1007                         sanitize_path(fname, NULL);
1008                 } else {
1009                         if (argc-- == 0)
1010                                 break;
1011                         strlcpy(fname, *argv++, MAXPATHLEN);
1012                         if (sanitize_paths)
1013                                 sanitize_path(fname, NULL);
1014                 }
1015
1016                 l = strlen(fname);
1017                 if (fname[l - 1] == '/') {
1018                         if (l == 2 && fname[0] == '.') {
1019                                 /* Turn "./" into just "." rather than "./." */
1020                                 fname[1] = '\0';
1021                         } else if (l < MAXPATHLEN) {
1022                                 fname[l++] = '.';
1023                                 fname[l] = '\0';
1024                         }
1025                 }
1026
1027                 if (link_stat(fname, &st) != 0) {
1028                         if (f != -1) {
1029                                 io_error |= IOERR_GENERAL;
1030                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1031                                         full_fname(fname), strerror(errno));
1032                         }
1033                         continue;
1034                 }
1035
1036                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1037                         rprintf(FINFO, "skipping directory %s\n", fname);
1038                         continue;
1039                 }
1040
1041                 dir = NULL;
1042                 olddir[0] = '\0';
1043
1044                 if (!relative_paths) {
1045                         p = strrchr(fname, '/');
1046                         if (p) {
1047                                 *p = 0;
1048                                 if (p == fname)
1049                                         dir = "/";
1050                                 else
1051                                         dir = fname;
1052                                 fname = p + 1;
1053                         }
1054                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1055                         /* this ensures we send the intermediate directories,
1056                            thus getting their permissions right */
1057                         char *lp = lastpath, *fn = fname, *slash = fname;
1058                         *p = 0;
1059                         /* Skip any initial directories in our path that we
1060                          * have in common with lastpath. */
1061                         while (*fn && *lp == *fn) {
1062                                 if (*fn == '/')
1063                                         slash = fn;
1064                                 lp++, fn++;
1065                         }
1066                         *p = '/';
1067                         if (fn != p || (*lp && *lp != '/')) {
1068                                 int copy_links_saved = copy_links;
1069                                 int recurse_saved = recurse;
1070                                 copy_links = copy_unsafe_links;
1071                                 /* set recurse to 1 to prevent make_file
1072                                  * from ignoring directory, but still
1073                                  * turn off the recursive parameter to
1074                                  * send_file_name */
1075                                 recurse = 1;
1076                                 while ((slash = strchr(slash+1, '/')) != 0) {
1077                                         *slash = 0;
1078                                         send_file_name(f, flist, fname, 0, 0);
1079                                         *slash = '/';
1080                                 }
1081                                 copy_links = copy_links_saved;
1082                                 recurse = recurse_saved;
1083                                 *p = 0;
1084                                 strlcpy(lastpath, fname, sizeof lastpath);
1085                                 *p = '/';
1086                         }
1087                 }
1088
1089                 if (!*fname)
1090                         fname = ".";
1091
1092                 if (dir && *dir) {
1093                         static char *lastdir;
1094                         static int lastdir_len;
1095
1096                         strcpy(olddir, curr_dir); /* can't overflow */
1097
1098                         if (!push_dir(dir)) {
1099                                 io_error |= IOERR_GENERAL;
1100                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1101                                         full_fname(dir), strerror(errno));
1102                                 continue;
1103                         }
1104
1105                         if (lastdir && strcmp(lastdir, dir) == 0) {
1106                                 flist_dir = lastdir;
1107                                 flist_dir_len = lastdir_len;
1108                         } else {
1109                                 flist_dir = lastdir = strdup(dir);
1110                                 flist_dir_len = lastdir_len = strlen(dir);
1111                         }
1112                 }
1113
1114                 if (one_file_system)
1115                         set_filesystem(fname);
1116
1117                 send_file_name(f, flist, fname, recurse, XMIT_TOP_DIR);
1118
1119                 if (olddir[0]) {
1120                         flist_dir = NULL;
1121                         flist_dir_len = 0;
1122                         if (!pop_dir(olddir)) {
1123                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1124                                         full_fname(dir), strerror(errno));
1125                                 exit_cleanup(RERR_FILESELECT);
1126                         }
1127                 }
1128         }
1129
1130         if (f != -1) {
1131                 send_file_entry(NULL, f, 0);
1132
1133                 if (show_filelist_p())
1134                         finish_filelist_progress(flist);
1135         }
1136
1137         clean_flist(flist, 0, 0);
1138
1139         if (f != -1) {
1140                 /* Now send the uid/gid list. This was introduced in
1141                  * protocol version 15 */
1142                 send_uid_list(f);
1143
1144                 /* send the io_error flag */
1145                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1146
1147                 io_end_buffering();
1148                 stats.flist_size = stats.total_written - start_write;
1149                 stats.num_files = flist->count;
1150                 if (write_batch)
1151                         write_batch_flist_info(flist->count, flist->files);
1152         }
1153
1154         if (verbose > 2)
1155                 rprintf(FINFO, "send_file_list done\n");
1156
1157         return flist;
1158 }
1159
1160
1161 struct file_list *recv_file_list(int f)
1162 {
1163         struct file_list *flist;
1164         unsigned short flags;
1165         int64 start_read;
1166         extern int list_only;
1167
1168         if (show_filelist_p())
1169                 start_filelist_progress("receiving file list");
1170
1171         start_read = stats.total_read;
1172
1173         flist = new(struct file_list);
1174         if (!flist)
1175                 goto oom;
1176
1177         flist->count = 0;
1178         flist->malloced = 1000;
1179         flist->files = new_array(struct file_struct *, flist->malloced);
1180         if (!flist->files)
1181                 goto oom;
1182
1183
1184         while ((flags = read_byte(f)) != 0) {
1185                 int i = flist->count;
1186
1187                 flist_expand(flist);
1188
1189                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1190                         flags |= read_byte(f) << 8;
1191                 receive_file_entry(&flist->files[i], flags, f);
1192
1193                 if (S_ISREG(flist->files[i]->mode))
1194                         stats.total_size += flist->files[i]->length;
1195
1196                 flist->count++;
1197
1198                 maybe_emit_filelist_progress(flist);
1199
1200                 if (verbose > 2) {
1201                         rprintf(FINFO, "recv_file_name(%s)\n",
1202                                 f_name(flist->files[i]));
1203                 }
1204         }
1205         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1206
1207         if (verbose > 2)
1208                 rprintf(FINFO, "received %d names\n", flist->count);
1209
1210         if (show_filelist_p())
1211                 finish_filelist_progress(flist);
1212
1213         clean_flist(flist, relative_paths, 1);
1214
1215         if (f != -1) {
1216                 /* Now send the uid/gid list. This was introduced in
1217                  * protocol version 15 */
1218                 recv_uid_list(f, flist);
1219
1220                 if (!read_batch) {
1221                         /* Recv the io_error flag */
1222                         if (lp_ignore_errors(module_id) || ignore_errors)
1223                                 read_int(f);
1224                         else
1225                                 io_error |= read_int(f);
1226                 }
1227         }
1228
1229         if (list_only) {
1230                 int i;
1231                 for (i = 0; i < flist->count; i++)
1232                         list_file_entry(flist->files[i]);
1233         }
1234
1235         if (verbose > 2)
1236                 rprintf(FINFO, "recv_file_list done\n");
1237
1238         stats.flist_size = stats.total_read - start_read;
1239         stats.num_files = flist->count;
1240
1241         return flist;
1242
1243       oom:
1244         out_of_memory("recv_file_list");
1245         return NULL;            /* not reached */
1246 }
1247
1248
1249 int file_compare(struct file_struct **file1, struct file_struct **file2)
1250 {
1251         struct file_struct *f1 = *file1;
1252         struct file_struct *f2 = *file2;
1253
1254         if (!f1->basename && !f2->basename)
1255                 return 0;
1256         if (!f1->basename)
1257                 return -1;
1258         if (!f2->basename)
1259                 return 1;
1260         if (f1->dirname == f2->dirname)
1261                 return u_strcmp(f1->basename, f2->basename);
1262         return f_name_cmp(f1, f2);
1263 }
1264
1265
1266 int flist_find(struct file_list *flist, struct file_struct *f)
1267 {
1268         int low = 0, high = flist->count - 1;
1269
1270         while (high >= 0 && !flist->files[high]->basename) high--;
1271
1272         if (high < 0)
1273                 return -1;
1274
1275         while (low != high) {
1276                 int mid = (low + high) / 2;
1277                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1278                 if (ret == 0)
1279                         return flist_up(flist, mid);
1280                 if (ret > 0)
1281                         high = mid;
1282                 else
1283                         low = mid + 1;
1284         }
1285
1286         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1287                 return flist_up(flist, low);
1288         return -1;
1289 }
1290
1291
1292 /*
1293  * Free up any resources a file_struct has allocated, and optionally free
1294  * it up as well.
1295  */
1296 void free_file(struct file_struct *file, int free_the_struct)
1297 {
1298 #if SUPPORT_HARD_LINKS
1299         if (file->link_u.idev)
1300                 free((char*)file->link_u.idev); /* Handles link_u.links too. */
1301 #endif
1302         if (free_the_struct)
1303                 free(file);
1304         else
1305                 memset(file, 0, sizeof file[0]);
1306 }
1307
1308
1309 /*
1310  * allocate a new file list
1311  */
1312 struct file_list *flist_new(void)
1313 {
1314         struct file_list *flist;
1315
1316         flist = new(struct file_list);
1317         if (!flist)
1318                 out_of_memory("send_file_list");
1319
1320         flist->count = 0;
1321         flist->malloced = 0;
1322         flist->files = NULL;
1323
1324         return flist;
1325 }
1326
1327 /*
1328  * free up all elements in a flist
1329  */
1330 void flist_free(struct file_list *flist)
1331 {
1332         int i;
1333         for (i = 1; i < flist->count; i++)
1334                 free_file(flist->files[i], FREE_STRUCT);
1335         free(flist->files);
1336         free(flist);
1337 }
1338
1339
1340 /*
1341  * This routine ensures we don't have any duplicate names in our file list.
1342  * duplicate names can cause corruption because of the pipelining
1343  */
1344 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1345 {
1346         int i, prev_i = 0;
1347
1348         if (!flist || flist->count == 0)
1349                 return;
1350
1351         qsort(flist->files, flist->count,
1352               sizeof(flist->files[0]), (int (*)()) file_compare);
1353
1354         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1355                 if (flist->files[i]->basename) {
1356                         prev_i = i;
1357                         break;
1358                 }
1359         }
1360         while (++i < flist->count) {
1361                 if (!flist->files[i]->basename)
1362                         continue;
1363                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1364                         if (verbose > 1 && !am_server) {
1365                                 rprintf(FINFO,
1366                                         "removing duplicate name %s from file list %d\n",
1367                                         f_name(flist->files[i]), i);
1368                         }
1369                         /* Make sure that if we unduplicate '.', that we don't
1370                          * lose track of a user-specified starting point (or
1371                          * else deletions will mysteriously fail with -R). */
1372                         if (flist->files[i]->flags & FLAG_TOP_DIR)
1373                                 flist->files[prev_i]->flags |= FLAG_TOP_DIR;
1374                         free_file(flist->files[i], CLEAR_STRUCT);
1375                 } else
1376                         prev_i = i;
1377         }
1378
1379         if (strip_root) {
1380                 /* we need to strip off the root directory in the case
1381                    of relative paths, but this must be done _after_
1382                    the sorting phase */
1383                 for (i = 0; i < flist->count; i++) {
1384                         if (flist->files[i]->dirname &&
1385                             flist->files[i]->dirname[0] == '/') {
1386                                 memmove(&flist->files[i]->dirname[0],
1387                                         &flist->files[i]->dirname[1],
1388                                         strlen(flist->files[i]->dirname));
1389                         }
1390
1391                         if (flist->files[i]->dirname &&
1392                             !flist->files[i]->dirname[0]) {
1393                                 flist->files[i]->dirname = NULL;
1394                         }
1395                 }
1396         }
1397
1398         if (verbose <= 3)
1399                 return;
1400
1401         for (i = 0; i < flist->count; i++) {
1402                 rprintf(FINFO, "[%s] i=%d %s %s %s mode=0%o len=%.0f\n",
1403                         who_am_i(), i,
1404                         NS(flist->files[i]->basedir),
1405                         NS(flist->files[i]->dirname),
1406                         NS(flist->files[i]->basename),
1407                         (int) flist->files[i]->mode,
1408                         (double) flist->files[i]->length);
1409         }
1410 }
1411
1412
1413 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1414
1415 /* Compare the names of two file_struct entities, just like strcmp()
1416  * would do if it were operating on the joined strings.  We assume
1417  * that there are no 0-length strings.
1418  */
1419 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1420 {
1421         int dif;
1422         const uchar *c1, *c2;
1423         enum fnc_state state1, state2;
1424
1425         if (!f1 || !f1->basename) {
1426                 if (!f2 || !f2->basename)
1427                         return 0;
1428                 return -1;
1429         }
1430         if (!f2 || !f2->basename)
1431                 return 1;
1432
1433         if (!(c1 = (uchar*)f1->dirname)) {
1434                 state1 = fnc_BASE;
1435                 c1 = (uchar*)f1->basename;
1436         } else
1437                 state1 = fnc_DIR;
1438         if (!(c2 = (uchar*)f2->dirname)) {
1439                 state2 = fnc_BASE;
1440                 c2 = (uchar*)f2->basename;
1441         } else
1442                 state2 = fnc_DIR;
1443
1444         while (1) {
1445                 if ((dif = (int)*c1 - (int)*c2) != 0)
1446                         break;
1447                 if (!*++c1) {
1448                         switch (state1) {
1449                         case fnc_DIR:
1450                                 state1 = fnc_SLASH;
1451                                 c1 = (uchar*)"/";
1452                                 break;
1453                         case fnc_SLASH:
1454                                 state1 = fnc_BASE;
1455                                 c1 = (uchar*)f1->basename;
1456                                 break;
1457                         case fnc_BASE:
1458                                 break;
1459                         }
1460                 }
1461                 if (!*++c2) {
1462                         switch (state2) {
1463                         case fnc_DIR:
1464                                 state2 = fnc_SLASH;
1465                                 c2 = (uchar*)"/";
1466                                 break;
1467                         case fnc_SLASH:
1468                                 state2 = fnc_BASE;
1469                                 c2 = (uchar*)f2->basename;
1470                                 break;
1471                         case fnc_BASE:
1472                                 if (!*c1)
1473                                         return 0;
1474                                 break;
1475                         }
1476                 }
1477         }
1478
1479         return dif;
1480 }
1481
1482
1483 /* Return a copy of the full filename of a flist entry, using the indicated
1484  * buffer.  No size-checking is done because we checked the size when creating
1485  * the file_struct entry.
1486  */
1487 char *f_name_to(struct file_struct *f, char *fbuf)
1488 {
1489         if (!f || !f->basename)
1490                 return NULL;
1491
1492         if (f->dirname) {
1493                 int len = strlen(f->dirname);
1494                 memcpy(fbuf, f->dirname, len);
1495                 fbuf[len] = '/';
1496                 strcpy(fbuf + len + 1, f->basename);
1497         } else
1498                 strcpy(fbuf, f->basename);
1499         return fbuf;
1500 }
1501
1502
1503 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1504  */
1505 char *f_name(struct file_struct *f)
1506 {
1507         static char names[5][MAXPATHLEN];
1508         static unsigned int n;
1509
1510         n = (n + 1) % (sizeof names / sizeof names[0]);
1511
1512         return f_name_to(f, names[n]);
1513 }