Die if we overflowed the args[] array when building up the remote
[rsync/rsync.git] / 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_root;
35 extern int am_server;
36 extern int always_checksum;
37 extern int module_id;
38 extern int ignore_errors;
39 extern int numeric_ids;
40
41 extern int cvs_exclude;
42
43 extern int recurse;
44 extern char curr_dir[MAXPATHLEN];
45 extern char *files_from;
46 extern int filesfrom_fd;
47
48 extern int one_file_system;
49 extern int make_backups;
50 extern int preserve_links;
51 extern int preserve_hard_links;
52 extern int preserve_perms;
53 extern int preserve_devices;
54 extern int preserve_uid;
55 extern int preserve_gid;
56 extern int preserve_times;
57 extern int relative_paths;
58 extern int implied_dirs;
59 extern int copy_links;
60 extern int copy_unsafe_links;
61 extern int protocol_version;
62 extern int sanitize_paths;
63
64 extern int read_batch;
65 extern int write_batch;
66
67 extern struct exclude_struct **exclude_list;
68 extern struct exclude_struct **server_exclude_list;
69 extern struct exclude_struct **local_exclude_list;
70
71 int io_error;
72
73 static char empty_sum[MD4_SUM_LENGTH];
74 static unsigned int min_file_struct_len;
75
76 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
77 static void output_flist(struct file_list *flist);
78
79
80 void init_flist(void)
81 {
82         struct file_struct f;
83
84         /* Figure out how big the file_struct is without trailing padding */
85         min_file_struct_len = ((char*)&f.flags - (char*)&f) + sizeof f.flags;
86 }
87
88
89 static int show_filelist_p(void)
90 {
91         return verbose && (recurse || files_from) && !am_server;
92 }
93
94 static void start_filelist_progress(char *kind)
95 {
96         rprintf(FINFO, "%s ... ", kind);
97         if ((verbose > 1) || do_progress)
98                 rprintf(FINFO, "\n");
99         rflush(FINFO);
100 }
101
102
103 static void emit_filelist_progress(const struct file_list *flist)
104 {
105         rprintf(FINFO, " %d files...\r", flist->count);
106 }
107
108
109 static void maybe_emit_filelist_progress(const struct file_list *flist)
110 {
111         if (do_progress && show_filelist_p() && ((flist->count % 100) == 0))
112                 emit_filelist_progress(flist);
113 }
114
115
116 static void finish_filelist_progress(const struct file_list *flist)
117 {
118         if (do_progress) {
119                 /* This overwrites the progress line */
120                 rprintf(FINFO, "%d file%sto consider\n",
121                         flist->count, flist->count == 1 ? " " : "s ");
122         } else
123                 rprintf(FINFO, "done\n");
124 }
125
126 void show_flist_stats(void)
127 {
128         /* Nothing yet */
129 }
130
131
132 static void list_file_entry(struct file_struct *f)
133 {
134         char perms[11];
135
136         if (!f->basename)
137                 /* this can happen if duplicate names were removed */
138                 return;
139
140         permstring(perms, f->mode);
141
142 #if SUPPORT_LINKS
143         if (preserve_links && S_ISLNK(f->mode)) {
144                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
145                         perms,
146                         (double) f->length, timestring(f->modtime),
147                         f_name(f), f->u.link);
148         } else
149 #endif
150                 rprintf(FINFO, "%s %11.0f %s %s\n",
151                         perms,
152                         (double) f->length, timestring(f->modtime),
153                         f_name(f));
154 }
155
156
157 /**
158  * Stat either a symlink or its referent, depending on the settings of
159  * copy_links, copy_unsafe_links, etc.
160  *
161  * @retval -1 on error
162  *
163  * @retval 0 for success
164  *
165  * @post If @p path is a symlink, then @p linkbuf (of size @c
166  * MAXPATHLEN) contains the symlink target.
167  *
168  * @post @p buffer contains information about the link or the
169  * referrent as appropriate, if they exist.
170  **/
171 int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
172 {
173 #if SUPPORT_LINKS
174         if (copy_links)
175                 return do_stat(path, buffer);
176         if (do_lstat(path, buffer) == -1)
177                 return -1;
178         if (S_ISLNK(buffer->st_mode)) {
179                 int l = readlink((char *) path, linkbuf, MAXPATHLEN - 1);
180                 if (l == -1)
181                         return -1;
182                 linkbuf[l] = 0;
183                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
184                         if (verbose > 1) {
185                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
186                                         path, linkbuf);
187                         }
188                         return do_stat(path, buffer);
189                 }
190         }
191         return 0;
192 #else
193         return do_stat(path, buffer);
194 #endif
195 }
196
197 int link_stat(const char *path, STRUCT_STAT * buffer)
198 {
199 #if SUPPORT_LINKS
200         if (copy_links)
201                 return do_stat(path, buffer);
202         return do_lstat(path, buffer);
203 #else
204         return do_stat(path, buffer);
205 #endif
206 }
207
208 /*
209  * This function is used to check if a file should be included/excluded
210  * from the list of files based on its name and type etc.  The value of
211  * exclude_level is set to either SERVER_EXCLUDES or ALL_EXCLUDES.
212  */
213 static int check_exclude_file(char *fname, int is_dir, int exclude_level)
214 {
215 #if 0 /* This currently never happens, so avoid a useless compare. */
216         if (exclude_level == NO_EXCLUDES)
217                 return 0;
218 #endif
219         if (fname) {
220                 /* never exclude '.', even if somebody does --exclude '*' */
221                 if (fname[0] == '.' && !fname[1])
222                         return 0;
223                 /* Handle the -R version of the '.' dir. */
224                 if (fname[0] == '/') {
225                         int len = strlen(fname);
226                         if (fname[len-1] == '.' && fname[len-2] == '/')
227                                 return 0;
228                 }
229         }
230         if (server_exclude_list
231          && check_exclude(server_exclude_list, fname, is_dir))
232                 return 1;
233         if (exclude_level != ALL_EXCLUDES)
234                 return 0;
235         if (exclude_list && check_exclude(exclude_list, fname, is_dir))
236                 return 1;
237         if (local_exclude_list
238          && check_exclude(local_exclude_list, fname, is_dir))
239                 return 1;
240         return 0;
241 }
242
243 /* used by the one_file_system code */
244 static dev_t filesystem_dev;
245
246 static void set_filesystem(char *fname)
247 {
248         STRUCT_STAT st;
249         if (link_stat(fname, &st) != 0)
250                 return;
251         filesystem_dev = st.st_dev;
252 }
253
254
255 static int to_wire_mode(mode_t mode)
256 {
257 #if SUPPORT_LINKS
258         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
259                 return (mode & ~(_S_IFMT)) | 0120000;
260 #endif
261         return (int) mode;
262 }
263
264 static mode_t from_wire_mode(int mode)
265 {
266         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
267                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
268         return (mode_t) mode;
269 }
270
271
272 static void send_directory(int f, struct file_list *flist, char *dir);
273
274 static char *flist_dir;
275 static int flist_dir_len;
276
277
278 /**
279  * Make sure @p flist is big enough to hold at least @p flist->count
280  * entries.
281  **/
282 void flist_expand(struct file_list *flist)
283 {
284         void *new_ptr;
285
286         if (flist->count < flist->malloced)
287                 return;
288
289         if (flist->malloced < FLIST_START)
290                 flist->malloced = FLIST_START;
291         else if (flist->malloced >= FLIST_LINEAR)
292                 flist->malloced += FLIST_LINEAR;
293         else
294                 flist->malloced *= 2;
295
296         /*
297          * In case count jumped or we are starting the list
298          * with a known size just set it.
299          */
300         if (flist->malloced < flist->count)
301                 flist->malloced = flist->count;
302
303         if (flist->files) {
304                 new_ptr = realloc_array(flist->files,
305                     struct file_struct *, flist->malloced);
306         } else {
307                 new_ptr = new_array(struct file_struct *, flist->malloced);
308         }
309
310         if (verbose >= 2) {
311                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
312                     who_am_i(),
313                     (double) sizeof flist->files[0] * flist->malloced,
314                     (new_ptr == flist->files) ? " not" : "");
315         }
316
317         flist->files = (struct file_struct **) new_ptr;
318
319         if (!flist->files)
320                 out_of_memory("flist_expand");
321 }
322
323 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
324 {
325         unsigned short flags;
326         static time_t modtime;
327         static mode_t mode;
328         static DEV64_T rdev, rdev_high;
329         static DEV64_T dev;
330         static uid_t uid;
331         static gid_t gid;
332         static char lastname[MAXPATHLEN];
333         char *fname, fbuf[MAXPATHLEN];
334         int l1, l2;
335
336         if (f == -1)
337                 return;
338
339         if (!file) {
340                 write_byte(f, 0);
341                 modtime = 0, mode = 0;
342                 rdev = 0, rdev_high = 0, dev = 0;
343                 uid = 0, gid = 0;
344                 *lastname = '\0';
345                 return;
346         }
347
348         io_write_phase = "send_file_entry";
349
350         fname = f_name_to(file, fbuf);
351
352         flags = base_flags;
353
354         if (file->mode == mode)
355                 flags |= XMIT_SAME_MODE;
356         else
357                 mode = file->mode;
358         if (preserve_devices) {
359                 if (protocol_version < 28) {
360                         if (IS_DEVICE(mode)) {
361                                 if (file->u.rdev == rdev) {
362                                         /* Set both flags to simplify the test
363                                          * when writing the data. */
364                                         flags |= XMIT_SAME_RDEV_pre28
365                                                | XMIT_SAME_HIGH_RDEV;
366                                 } else
367                                         rdev = file->u.rdev;
368                         } else
369                                 rdev = 0;
370                 } else if (IS_DEVICE(mode)) {
371                         if ((file->u.rdev & ~0xFF) == rdev_high)
372                                 flags |= XMIT_SAME_HIGH_RDEV;
373                         else {
374                                 rdev = file->u.rdev;
375                                 rdev_high = rdev & ~0xFF;
376                         }
377                 }
378         }
379         if (file->uid == uid)
380                 flags |= XMIT_SAME_UID;
381         else
382                 uid = file->uid;
383         if (file->gid == gid)
384                 flags |= XMIT_SAME_GID;
385         else
386                 gid = file->gid;
387         if (file->modtime == modtime)
388                 flags |= XMIT_SAME_TIME;
389         else
390                 modtime = file->modtime;
391
392 #if SUPPORT_HARD_LINKS
393         if (file->link_u.idev) {
394                 if (file->F_DEV == dev) {
395                         if (protocol_version >= 28)
396                                 flags |= XMIT_SAME_DEV;
397                 } else
398                         dev = file->F_DEV;
399                 flags |= XMIT_HAS_IDEV_DATA;
400         }
401 #endif
402
403         for (l1 = 0;
404              lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
405              l1++) {}
406         l2 = strlen(fname+l1);
407
408         if (l1 > 0)
409                 flags |= XMIT_SAME_NAME;
410         if (l2 > 255)
411                 flags |= XMIT_LONG_NAME;
412
413         /* We must make sure we don't send a zero flag byte or the
414          * other end will terminate the flist transfer.  Note that
415          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
416          * it's harmless way to add a bit to the first flag byte. */
417         if (protocol_version >= 28) {
418                 if (!flags && !S_ISDIR(mode))
419                         flags |= XMIT_TOP_DIR;
420                 if ((flags & 0xFF00) || !flags) {
421                         flags |= XMIT_EXTENDED_FLAGS;
422                         write_byte(f, flags);
423                         write_byte(f, flags >> 8);
424                 } else
425                         write_byte(f, flags);
426         } else {
427                 if (!(flags & 0xFF) && !S_ISDIR(mode))
428                         flags |= XMIT_TOP_DIR;
429                 if (!(flags & 0xFF))
430                         flags |= XMIT_LONG_NAME;
431                 write_byte(f, flags);
432         }
433         if (flags & XMIT_SAME_NAME)
434                 write_byte(f, l1);
435         if (flags & XMIT_LONG_NAME)
436                 write_int(f, l2);
437         else
438                 write_byte(f, l2);
439         write_buf(f, fname + l1, l2);
440
441         write_longint(f, file->length);
442         if (!(flags & XMIT_SAME_TIME))
443                 write_int(f, modtime);
444         if (!(flags & XMIT_SAME_MODE))
445                 write_int(f, to_wire_mode(mode));
446         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
447                 if (!numeric_ids)
448                         add_uid(uid);
449                 write_int(f, uid);
450         }
451         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
452                 if (!numeric_ids)
453                         add_gid(gid);
454                 write_int(f, gid);
455         }
456         if (preserve_devices && IS_DEVICE(mode)) {
457                 /* If XMIT_SAME_HIGH_RDEV is off, XMIT_SAME_RDEV_pre28 is
458                  * also off. */
459                 if (!(flags & XMIT_SAME_HIGH_RDEV))
460                         write_int(f, rdev);
461                 else if (protocol_version >= 28)
462                         write_byte(f, rdev);
463         }
464
465 #if SUPPORT_LINKS
466         if (preserve_links && S_ISLNK(mode)) {
467                 int len = strlen(file->u.link);
468                 write_int(f, len);
469                 write_buf(f, file->u.link, len);
470         }
471 #endif
472
473 #if SUPPORT_HARD_LINKS
474         if (flags & XMIT_HAS_IDEV_DATA) {
475                 if (protocol_version < 26) {
476                         /* 32-bit dev_t and ino_t */
477                         write_int(f, dev);
478                         write_int(f, file->F_INODE);
479                 } else {
480                         /* 64-bit dev_t and ino_t */
481                         if (!(flags & XMIT_SAME_DEV))
482                                 write_longint(f, dev);
483                         write_longint(f, file->F_INODE);
484                 }
485         }
486 #endif
487
488         if (always_checksum) {
489                 char *sum;
490                 if (S_ISREG(mode))
491                         sum = file->u.sum;
492                 else if (protocol_version < 28) {
493                         /* Prior to 28, we sent a useless set of nulls. */
494                         sum = empty_sum;
495                 } else
496                         sum = NULL;
497                 if (sum) {
498                         write_buf(f, sum, protocol_version < 21? 2
499                                                         : MD4_SUM_LENGTH);
500                 }
501         }
502
503         strlcpy(lastname, fname, MAXPATHLEN);
504
505         io_write_phase = "unknown";
506 }
507
508
509
510 void receive_file_entry(struct file_struct **fptr, unsigned short flags, int f)
511 {
512         static time_t modtime;
513         static mode_t mode;
514         static DEV64_T rdev, rdev_high;
515         static DEV64_T dev;
516         static uid_t uid;
517         static gid_t gid;
518         static char lastname[MAXPATHLEN], *lastdir;
519         static int lastdir_len = -1;
520         char thisname[MAXPATHLEN];
521         unsigned int l1 = 0, l2 = 0;
522         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
523         int file_struct_len, idev_len;
524         OFF_T file_length;
525         char *basename, *dirname, *bp;
526         struct file_struct *file;
527
528         if (!fptr) {
529                 modtime = 0, mode = 0;
530                 rdev = 0, rdev_high = 0, dev = 0;
531                 uid = 0, gid = 0;
532                 *lastname = '\0';
533                 return;
534         }
535
536         if (flags & XMIT_SAME_NAME)
537                 l1 = read_byte(f);
538
539         if (flags & XMIT_LONG_NAME)
540                 l2 = read_int(f);
541         else
542                 l2 = read_byte(f);
543
544         if (l2 >= MAXPATHLEN - l1) {
545                 rprintf(FERROR,
546                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
547                         flags, l1, l2, lastname);
548                 overflow("receive_file_entry");
549         }
550
551         strlcpy(thisname, lastname, l1 + 1);
552         read_sbuf(f, &thisname[l1], l2);
553         thisname[l1 + l2] = 0;
554
555         strlcpy(lastname, thisname, MAXPATHLEN);
556
557         clean_fname(thisname);
558
559         if (sanitize_paths)
560                 sanitize_path(thisname, NULL);
561
562         if ((basename = strrchr(thisname, '/')) != NULL) {
563                 dirname_len = ++basename - thisname; /* counts future '\0' */
564                 if (lastdir_len == dirname_len - 1
565                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
566                         dirname = lastdir;
567                         dirname_len = 0; /* indicates no copy is needed */
568                 } else
569                         dirname = thisname;
570         } else {
571                 basename = thisname;
572                 dirname = NULL;
573                 dirname_len = 0;
574         }
575         basename_len = strlen(basename) + 1; /* count the '\0' */
576
577         file_length = read_longint(f);
578         if (!(flags & XMIT_SAME_TIME))
579                 modtime = (time_t)read_int(f);
580         if (!(flags & XMIT_SAME_MODE))
581                 mode = from_wire_mode(read_int(f));
582
583         if (preserve_uid && !(flags & XMIT_SAME_UID))
584                 uid = (uid_t)read_int(f);
585         if (preserve_gid && !(flags & XMIT_SAME_GID))
586                 gid = (gid_t)read_int(f);
587
588         if (preserve_devices) {
589                 if (protocol_version < 28) {
590                         if (IS_DEVICE(mode)) {
591                                 if (!(flags & XMIT_SAME_RDEV_pre28))
592                                         rdev = (DEV64_T)read_int(f);
593                         } else
594                                 rdev = 0;
595                 } else if (IS_DEVICE(mode)) {
596                         if (!(flags & XMIT_SAME_HIGH_RDEV)) {
597                                 rdev = (DEV64_T)read_int(f);
598                                 rdev_high = rdev & ~0xFF;
599                         } else
600                                 rdev = rdev_high | (DEV64_T)read_byte(f);
601                 }
602         }
603
604 #if SUPPORT_LINKS
605         if (preserve_links && S_ISLNK(mode)) {
606                 linkname_len = read_int(f) + 1; /* count the '\0' */
607                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
608                         rprintf(FERROR, "overflow: linkname_len=%d\n",
609                                 linkname_len - 1);
610                         overflow("receive_file_entry");
611                 }
612         }
613         else
614 #endif
615                 linkname_len = 0;
616
617 #if SUPPORT_HARD_LINKS
618         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
619                 flags |= XMIT_HAS_IDEV_DATA;
620         if (flags & XMIT_HAS_IDEV_DATA)
621                 idev_len = sizeof (struct idev);
622         else
623 #endif
624                 idev_len = 0;
625
626         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
627         file_struct_len = idev_len? sizeof file[0] : min_file_struct_len;
628
629         alloc_len = file_struct_len + dirname_len + basename_len
630                   + linkname_len + sum_len + idev_len;
631         if (!(bp = new_array(char, alloc_len)))
632                 out_of_memory("receive_file_entry");
633         file = *fptr = (struct file_struct *)bp;
634         memset(bp, 0, min_file_struct_len);
635         bp += file_struct_len;
636
637         file->flags = flags & XMIT_TOP_DIR ? FLAG_TOP_DIR : 0;
638         file->modtime = modtime;
639         file->length = file_length;
640         file->mode = mode;
641         file->uid = uid;
642         file->gid = gid;
643
644 #if SUPPORT_HARD_LINKS
645         if (idev_len) {
646                 file->link_u.idev = (struct idev *)bp;
647                 bp += idev_len;
648         }
649 #endif
650
651         if (dirname_len) {
652                 file->dirname = lastdir = bp;
653                 lastdir_len = dirname_len - 1;
654                 memcpy(bp, dirname, dirname_len - 1);
655                 bp += dirname_len;
656                 bp[-1] = '\0';
657         } else if (dirname)
658                 file->dirname = dirname;
659
660         file->basename = bp;
661         memcpy(bp, basename, basename_len);
662         bp += basename_len;
663
664         if (preserve_devices && IS_DEVICE(mode))
665                 file->u.rdev = rdev;
666
667 #if SUPPORT_LINKS
668         if (linkname_len) {
669                 file->u.link = bp;
670                 read_sbuf(f, bp, linkname_len - 1);
671                 if (sanitize_paths)
672                         sanitize_path(bp, lastdir);
673                 bp += linkname_len;
674         }
675 #endif
676
677 #if SUPPORT_HARD_LINKS
678         if (idev_len) {
679                 if (protocol_version < 26) {
680                         dev = read_int(f);
681                         file->F_INODE = read_int(f);
682                 } else {
683                         if (!(flags & XMIT_SAME_DEV))
684                                 dev = read_longint(f);
685                         file->F_INODE = read_longint(f);
686                 }
687                 file->F_DEV = dev;
688         }
689 #endif
690
691         if (always_checksum) {
692                 char *sum;
693                 if (sum_len) {
694                         file->u.sum = sum = bp;
695                         /*bp += sum_len;*/
696                 } else if (protocol_version < 28) {
697                         /* Prior to 28, we get a useless set of nulls. */
698                         sum = empty_sum;
699                 } else
700                         sum = NULL;
701                 if (sum) {
702                         read_buf(f, sum, protocol_version < 21? 2
703                                                 : MD4_SUM_LENGTH);
704                 }
705         }
706
707         if (!preserve_perms) {
708                 extern int orig_umask;
709                 /* set an appropriate set of permissions based on original
710                  * permissions and umask. This emulates what GNU cp does */
711                 file->mode &= ~orig_umask;
712         }
713 }
714
715
716 /**
717  * Create a file_struct for a named file by reading its stat()
718  * information and performing extensive checks against global
719  * options.
720  *
721  * @return the new file, or NULL if there was an error or this file
722  * should be excluded.
723  *
724  * @todo There is a small optimization opportunity here to avoid
725  * stat()ing the file in some circumstances, which has a certain cost.
726  * We are called immediately after doing readdir(), and so we may
727  * already know the d_type of the file.  We could for example avoid
728  * statting directories if we're not recursing, but this is not a very
729  * important case.  Some systems may not have d_type.
730  **/
731 struct file_struct *make_file(char *fname, int exclude_level)
732 {
733         static char *lastdir;
734         static int lastdir_len = -1;
735         struct file_struct *file;
736         STRUCT_STAT st;
737         char sum[SUM_LENGTH];
738         char thisname[MAXPATHLEN];
739         char linkname[MAXPATHLEN];
740         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
741         int file_struct_len, idev_len;
742         char *basename, *dirname, *bp;
743         unsigned short flags = 0;
744
745         if (strlcpy(thisname, fname, sizeof thisname)
746             >= sizeof thisname - flist_dir_len) {
747                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
748                 return NULL;
749         }
750         clean_fname(thisname);
751         if (sanitize_paths)
752                 sanitize_path(thisname, NULL);
753
754         memset(sum, 0, SUM_LENGTH);
755
756         if (readlink_stat(thisname, &st, linkname) != 0) {
757                 int save_errno = errno;
758                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
759                         /* either symlink pointing nowhere or file that
760                          * was removed during rsync run; see if excluded
761                          * before reporting an error */
762                         if (check_exclude_file(thisname, 0, exclude_level)) {
763                                 /* file is excluded anyway, ignore silently */
764                                 return NULL;
765                         }
766                 }
767                 io_error |= IOERR_GENERAL;
768                 rprintf(FERROR, "readlink %s failed: %s\n",
769                         full_fname(thisname), strerror(save_errno));
770                 return NULL;
771         }
772
773         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
774         if (exclude_level == NO_EXCLUDES)
775                 goto skip_excludes;
776
777         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
778                 rprintf(FINFO, "skipping directory %s\n", thisname);
779                 return NULL;
780         }
781
782         /* We only care about directories because we need to avoid recursing
783          * into a mount-point directory, not to avoid copying a symlinked
784          * file if -L (or similar) was specified. */
785         if (one_file_system && st.st_dev != filesystem_dev
786             && S_ISDIR(st.st_mode))
787                 flags |= FLAG_MOUNT_POINT;
788
789         if (check_exclude_file(thisname, S_ISDIR(st.st_mode) != 0, exclude_level))
790                 return NULL;
791
792         if (lp_ignore_nonreadable(module_id) && access(thisname, R_OK) != 0)
793                 return NULL;
794
795       skip_excludes:
796
797         if (verbose > 2) {
798                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
799                         who_am_i(), thisname, exclude_level);
800         }
801
802         if ((basename = strrchr(thisname, '/')) != NULL) {
803                 dirname_len = ++basename - thisname; /* counts future '\0' */
804                 if (lastdir_len == dirname_len - 1
805                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
806                         dirname = lastdir;
807                         dirname_len = 0; /* indicates no copy is needed */
808                 } else
809                         dirname = thisname;
810         } else {
811                 basename = thisname;
812                 dirname = NULL;
813                 dirname_len = 0;
814         }
815         basename_len = strlen(basename) + 1; /* count the '\0' */
816
817 #if SUPPORT_LINKS
818         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
819 #else
820         linkname_len = 0;
821 #endif
822
823 #if SUPPORT_HARD_LINKS
824         if (preserve_hard_links) {
825                 if (protocol_version < 28) {
826                         if (S_ISREG(st.st_mode))
827                                 idev_len = sizeof (struct idev);
828                         else
829                                 idev_len = 0;
830                 } else {
831                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
832                                 idev_len = sizeof (struct idev);
833                         else
834                                 idev_len = 0;
835                 }
836         } else
837 #endif
838                 idev_len = 0;
839
840         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
841         file_struct_len = idev_len? sizeof file[0] : min_file_struct_len;
842
843         alloc_len = file_struct_len + dirname_len + basename_len
844                   + linkname_len + sum_len + idev_len;
845         if (!(bp = new_array(char, alloc_len)))
846                 out_of_memory("receive_file_entry");
847         file = (struct file_struct *)bp;
848         memset(bp, 0, min_file_struct_len);
849         bp += file_struct_len;
850
851         file->flags = flags;
852         file->modtime = st.st_mtime;
853         file->length = st.st_size;
854         file->mode = st.st_mode;
855         file->uid = st.st_uid;
856         file->gid = st.st_gid;
857
858 #if SUPPORT_HARD_LINKS
859         if (idev_len) {
860                 file->link_u.idev = (struct idev *)bp;
861                 bp += idev_len;
862                 file->F_DEV = st.st_dev;
863                 file->F_INODE = st.st_ino;
864         }
865 #endif
866
867         if (dirname_len) {
868                 file->dirname = lastdir = bp;
869                 lastdir_len = dirname_len - 1;
870                 memcpy(bp, dirname, dirname_len - 1);
871                 bp += dirname_len;
872                 bp[-1] = '\0';
873         } else if (dirname)
874                 file->dirname = dirname;
875
876         file->basename = bp;
877         memcpy(bp, basename, basename_len);
878         bp += basename_len;
879
880 #ifdef HAVE_STRUCT_STAT_ST_RDEV
881         if (preserve_devices && IS_DEVICE(st.st_mode))
882                 file->u.rdev = st.st_rdev;
883 #endif
884
885 #if SUPPORT_LINKS
886         if (linkname_len) {
887                 file->u.link = bp;
888                 memcpy(bp, linkname, linkname_len);
889                 bp += linkname_len;
890         }
891 #endif
892
893         if (sum_len) {
894                 file->u.sum = bp;
895                 file_checksum(thisname, bp, st.st_size);
896                 /*bp += sum_len;*/
897         }
898
899         file->basedir = flist_dir;
900
901         if (!S_ISDIR(st.st_mode))
902                 stats.total_size += st.st_size;
903
904         return file;
905 }
906
907
908 void send_file_name(int f, struct file_list *flist, char *fname,
909                     int recursive, unsigned short base_flags)
910 {
911         struct file_struct *file;
912         char fbuf[MAXPATHLEN];
913         extern int delete_excluded;
914
915         /* f is set to -1 when calculating deletion file list */
916         file = make_file(fname,
917                          f == -1 && delete_excluded? SERVER_EXCLUDES
918                                                    : ALL_EXCLUDES);
919
920         if (!file)
921                 return;
922
923         maybe_emit_filelist_progress(flist);
924
925         flist_expand(flist);
926
927         if (write_batch)
928                 file->flags |= FLAG_TOP_DIR;
929
930         if (file->basename[0]) {
931                 flist->files[flist->count++] = file;
932                 send_file_entry(file, f, base_flags);
933         }
934
935         if (recursive && S_ISDIR(file->mode)
936             && !(file->flags & FLAG_MOUNT_POINT)) {
937                 struct exclude_struct **last_exclude_list = local_exclude_list;
938                 send_directory(f, flist, f_name_to(file, fbuf));
939                 local_exclude_list = last_exclude_list;
940                 return;
941         }
942 }
943
944
945 static void send_directory(int f, struct file_list *flist, char *dir)
946 {
947         DIR *d;
948         struct dirent *di;
949         char fname[MAXPATHLEN];
950         unsigned int offset;
951         char *p;
952
953         d = opendir(dir);
954         if (!d) {
955                 io_error |= IOERR_GENERAL;
956                 rprintf(FERROR, "opendir %s failed: %s\n",
957                         full_fname(dir), strerror(errno));
958                 return;
959         }
960
961         offset = strlcpy(fname, dir, MAXPATHLEN);
962         p = fname + offset;
963         if (offset >= MAXPATHLEN || p[-1] != '/') {
964                 if (offset >= MAXPATHLEN - 1) {
965                         io_error |= IOERR_GENERAL;
966                         rprintf(FERROR, "skipping long-named directory: %s\n",
967                                 full_fname(fname));
968                         closedir(d);
969                         return;
970                 }
971                 *p++ = '/';
972                 offset++;
973         }
974
975         local_exclude_list = NULL;
976
977         if (cvs_exclude) {
978                 if (strlcpy(p, ".cvsignore", MAXPATHLEN - offset)
979                     < MAXPATHLEN - offset)
980                         add_exclude_file(&local_exclude_list,fname,MISSING_OK,ADD_EXCLUDE);
981                 else {
982                         io_error |= IOERR_GENERAL;
983                         rprintf(FINFO,
984                                 "cannot cvs-exclude in long-named directory %s\n",
985                                 full_fname(fname));
986                 }
987         }
988
989         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
990                 char *dname = d_name(di);
991                 if (dname[0] == '.' && (dname[1] == '\0'
992                     || (dname[1] == '.' && dname[2] == '\0')))
993                         continue;
994                 if (strlcpy(p, dname, MAXPATHLEN - offset) < MAXPATHLEN - offset)
995                         send_file_name(f, flist, fname, recurse, 0);
996                 else {
997                         io_error |= IOERR_GENERAL;
998                         rprintf(FINFO,
999                                 "cannot send long-named file %s\n",
1000                                 full_fname(fname));
1001                 }
1002         }
1003         if (errno) {
1004                 io_error |= IOERR_GENERAL;
1005                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
1006                         dir, errno, strerror(errno));
1007         }
1008
1009         if (local_exclude_list)
1010                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
1011
1012         closedir(d);
1013 }
1014
1015
1016 /**
1017  * The delete_files() function in receiver.c sets f to -1 so that we just
1018  * construct the file list in memory without sending it over the wire.  It
1019  * also has the side-effect of ignoring user-excludes if delete_excluded
1020  * is set (so that the delete list includes user-excluded files).
1021  **/
1022 struct file_list *send_file_list(int f, int argc, char *argv[])
1023 {
1024         int l;
1025         STRUCT_STAT st;
1026         char *p, *dir, olddir[sizeof curr_dir];
1027         char lastpath[MAXPATHLEN] = "";
1028         struct file_list *flist;
1029         int64 start_write;
1030         int use_ff_fd = 0;
1031
1032         if (show_filelist_p() && f != -1)
1033                 start_filelist_progress("building file list");
1034
1035         start_write = stats.total_written;
1036
1037         flist = flist_new();
1038
1039         if (f != -1) {
1040                 io_start_buffering_out(f);
1041                 if (filesfrom_fd >= 0) {
1042                         if (argv[0] && !push_dir(argv[0])) {
1043                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1044                                         full_fname(argv[0]), strerror(errno));
1045                                 exit_cleanup(RERR_FILESELECT);
1046                         }
1047                         use_ff_fd = 1;
1048                 }
1049         }
1050
1051         while (1) {
1052                 char fname2[MAXPATHLEN];
1053                 char *fname = fname2;
1054
1055                 if (use_ff_fd) {
1056                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1057                                 break;
1058                         sanitize_path(fname, NULL);
1059                 } else {
1060                         if (argc-- == 0)
1061                                 break;
1062                         strlcpy(fname, *argv++, MAXPATHLEN);
1063                         if (sanitize_paths)
1064                                 sanitize_path(fname, NULL);
1065                 }
1066
1067                 l = strlen(fname);
1068                 if (fname[l - 1] == '/') {
1069                         if (l == 2 && fname[0] == '.') {
1070                                 /* Turn "./" into just "." rather than "./." */
1071                                 fname[1] = '\0';
1072                         } else if (l < MAXPATHLEN) {
1073                                 fname[l++] = '.';
1074                                 fname[l] = '\0';
1075                         }
1076                 }
1077
1078                 if (link_stat(fname, &st) != 0) {
1079                         if (f != -1) {
1080                                 io_error |= IOERR_GENERAL;
1081                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1082                                         full_fname(fname), strerror(errno));
1083                         }
1084                         continue;
1085                 }
1086
1087                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1088                         rprintf(FINFO, "skipping directory %s\n", fname);
1089                         continue;
1090                 }
1091
1092                 dir = NULL;
1093                 olddir[0] = '\0';
1094
1095                 if (!relative_paths) {
1096                         p = strrchr(fname, '/');
1097                         if (p) {
1098                                 *p = 0;
1099                                 if (p == fname)
1100                                         dir = "/";
1101                                 else
1102                                         dir = fname;
1103                                 fname = p + 1;
1104                         }
1105                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1106                         /* this ensures we send the intermediate directories,
1107                            thus getting their permissions right */
1108                         char *lp = lastpath, *fn = fname, *slash = fname;
1109                         *p = 0;
1110                         /* Skip any initial directories in our path that we
1111                          * have in common with lastpath. */
1112                         while (*fn && *lp == *fn) {
1113                                 if (*fn == '/')
1114                                         slash = fn;
1115                                 lp++, fn++;
1116                         }
1117                         *p = '/';
1118                         if (fn != p || (*lp && *lp != '/')) {
1119                                 int copy_links_saved = copy_links;
1120                                 int recurse_saved = recurse;
1121                                 copy_links = copy_unsafe_links;
1122                                 /* set recurse to 1 to prevent make_file
1123                                  * from ignoring directory, but still
1124                                  * turn off the recursive parameter to
1125                                  * send_file_name */
1126                                 recurse = 1;
1127                                 while ((slash = strchr(slash+1, '/')) != 0) {
1128                                         *slash = 0;
1129                                         send_file_name(f, flist, fname, 0, 0);
1130                                         *slash = '/';
1131                                 }
1132                                 copy_links = copy_links_saved;
1133                                 recurse = recurse_saved;
1134                                 *p = 0;
1135                                 strlcpy(lastpath, fname, sizeof lastpath);
1136                                 *p = '/';
1137                         }
1138                 }
1139
1140                 if (!*fname)
1141                         fname = ".";
1142
1143                 if (dir && *dir) {
1144                         static char *lastdir;
1145                         static int lastdir_len;
1146
1147                         strcpy(olddir, curr_dir); /* can't overflow */
1148
1149                         if (!push_dir(dir)) {
1150                                 io_error |= IOERR_GENERAL;
1151                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1152                                         full_fname(dir), strerror(errno));
1153                                 continue;
1154                         }
1155
1156                         if (lastdir && strcmp(lastdir, dir) == 0) {
1157                                 flist_dir = lastdir;
1158                                 flist_dir_len = lastdir_len;
1159                         } else {
1160                                 flist_dir = lastdir = strdup(dir);
1161                                 flist_dir_len = lastdir_len = strlen(dir);
1162                         }
1163                 }
1164
1165                 if (one_file_system)
1166                         set_filesystem(fname);
1167
1168                 send_file_name(f, flist, fname, recurse, XMIT_TOP_DIR);
1169
1170                 if (olddir[0]) {
1171                         flist_dir = NULL;
1172                         flist_dir_len = 0;
1173                         if (!pop_dir(olddir)) {
1174                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1175                                         full_fname(dir), strerror(errno));
1176                                 exit_cleanup(RERR_FILESELECT);
1177                         }
1178                 }
1179         }
1180
1181         if (f != -1) {
1182                 send_file_entry(NULL, f, 0);
1183
1184                 if (show_filelist_p())
1185                         finish_filelist_progress(flist);
1186         }
1187
1188         clean_flist(flist, 0, 0);
1189
1190         if (f != -1) {
1191                 /* Now send the uid/gid list. This was introduced in
1192                  * protocol version 15 */
1193                 send_uid_list(f);
1194
1195                 /* send the io_error flag */
1196                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1197
1198                 io_end_buffering();
1199                 stats.flist_size = stats.total_written - start_write;
1200                 stats.num_files = flist->count;
1201                 if (write_batch)
1202                         write_batch_flist_info(flist->count, flist->files);
1203         }
1204
1205         if (verbose > 3)
1206                 output_flist(flist);
1207
1208         if (verbose > 2)
1209                 rprintf(FINFO, "send_file_list done\n");
1210
1211         return flist;
1212 }
1213
1214
1215 struct file_list *recv_file_list(int f)
1216 {
1217         struct file_list *flist;
1218         unsigned short flags;
1219         int64 start_read;
1220         extern int list_only;
1221
1222         if (show_filelist_p())
1223                 start_filelist_progress("receiving file list");
1224
1225         start_read = stats.total_read;
1226
1227         flist = new(struct file_list);
1228         if (!flist)
1229                 goto oom;
1230
1231         flist->count = 0;
1232         flist->malloced = 1000;
1233         flist->files = new_array(struct file_struct *, flist->malloced);
1234         if (!flist->files)
1235                 goto oom;
1236
1237
1238         while ((flags = read_byte(f)) != 0) {
1239                 int i = flist->count;
1240
1241                 flist_expand(flist);
1242
1243                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1244                         flags |= read_byte(f) << 8;
1245                 receive_file_entry(&flist->files[i], flags, f);
1246
1247                 if (S_ISREG(flist->files[i]->mode))
1248                         stats.total_size += flist->files[i]->length;
1249
1250                 flist->count++;
1251
1252                 maybe_emit_filelist_progress(flist);
1253
1254                 if (verbose > 2) {
1255                         rprintf(FINFO, "recv_file_name(%s)\n",
1256                                 f_name(flist->files[i]));
1257                 }
1258         }
1259         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1260
1261         if (verbose > 2)
1262                 rprintf(FINFO, "received %d names\n", flist->count);
1263
1264         if (show_filelist_p())
1265                 finish_filelist_progress(flist);
1266
1267         clean_flist(flist, relative_paths, 1);
1268
1269         if (f != -1) {
1270                 /* Now send the uid/gid list. This was introduced in
1271                  * protocol version 15 */
1272                 recv_uid_list(f, flist);
1273
1274                 if (!read_batch) {
1275                         /* Recv the io_error flag */
1276                         if (lp_ignore_errors(module_id) || ignore_errors)
1277                                 read_int(f);
1278                         else
1279                                 io_error |= read_int(f);
1280                 }
1281         }
1282
1283         if (verbose > 3)
1284                 output_flist(flist);
1285
1286         if (list_only) {
1287                 int i;
1288                 for (i = 0; i < flist->count; i++)
1289                         list_file_entry(flist->files[i]);
1290         }
1291
1292         if (verbose > 2)
1293                 rprintf(FINFO, "recv_file_list done\n");
1294
1295         stats.flist_size = stats.total_read - start_read;
1296         stats.num_files = flist->count;
1297
1298         return flist;
1299
1300       oom:
1301         out_of_memory("recv_file_list");
1302         return NULL;            /* not reached */
1303 }
1304
1305
1306 int file_compare(struct file_struct **file1, struct file_struct **file2)
1307 {
1308         struct file_struct *f1 = *file1;
1309         struct file_struct *f2 = *file2;
1310
1311         if (!f1->basename && !f2->basename)
1312                 return 0;
1313         if (!f1->basename)
1314                 return -1;
1315         if (!f2->basename)
1316                 return 1;
1317         if (f1->dirname == f2->dirname)
1318                 return u_strcmp(f1->basename, f2->basename);
1319         return f_name_cmp(f1, f2);
1320 }
1321
1322
1323 int flist_find(struct file_list *flist, struct file_struct *f)
1324 {
1325         int low = 0, high = flist->count - 1;
1326
1327         while (high >= 0 && !flist->files[high]->basename) high--;
1328
1329         if (high < 0)
1330                 return -1;
1331
1332         while (low != high) {
1333                 int mid = (low + high) / 2;
1334                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1335                 if (ret == 0)
1336                         return flist_up(flist, mid);
1337                 if (ret > 0)
1338                         high = mid;
1339                 else
1340                         low = mid + 1;
1341         }
1342
1343         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1344                 return flist_up(flist, low);
1345         return -1;
1346 }
1347
1348
1349 /*
1350  * Free up any resources a file_struct has allocated, and optionally free
1351  * it up as well.
1352  */
1353 void free_file(struct file_struct *file, int free_the_struct)
1354 {
1355         if (free_the_struct)
1356                 free(file);
1357         else
1358                 memset(file, 0, min_file_struct_len);
1359 }
1360
1361
1362 /*
1363  * allocate a new file list
1364  */
1365 struct file_list *flist_new(void)
1366 {
1367         struct file_list *flist;
1368
1369         flist = new(struct file_list);
1370         if (!flist)
1371                 out_of_memory("send_file_list");
1372
1373         flist->count = 0;
1374         flist->malloced = 0;
1375         flist->files = NULL;
1376
1377         return flist;
1378 }
1379
1380 /*
1381  * free up all elements in a flist
1382  */
1383 void flist_free(struct file_list *flist)
1384 {
1385         int i;
1386         for (i = 1; i < flist->count; i++)
1387                 free_file(flist->files[i], FREE_STRUCT);
1388         free(flist->files);
1389         free(flist);
1390 }
1391
1392
1393 /*
1394  * This routine ensures we don't have any duplicate names in our file list.
1395  * duplicate names can cause corruption because of the pipelining
1396  */
1397 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1398 {
1399         int i, prev_i = 0;
1400
1401         if (!flist || flist->count == 0)
1402                 return;
1403
1404         qsort(flist->files, flist->count,
1405               sizeof flist->files[0], (int (*)()) file_compare);
1406
1407         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1408                 if (flist->files[i]->basename) {
1409                         prev_i = i;
1410                         break;
1411                 }
1412         }
1413         while (++i < flist->count) {
1414                 if (!flist->files[i]->basename)
1415                         continue;
1416                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1417                         if (verbose > 1 && !am_server) {
1418                                 rprintf(FINFO,
1419                                         "removing duplicate name %s from file list %d\n",
1420                                         f_name(flist->files[i]), i);
1421                         }
1422                         /* Make sure that if we unduplicate '.', that we don't
1423                          * lose track of a user-specified starting point (or
1424                          * else deletions will mysteriously fail with -R). */
1425                         if (flist->files[i]->flags & FLAG_TOP_DIR)
1426                                 flist->files[prev_i]->flags |= FLAG_TOP_DIR;
1427                         free_file(flist->files[i], CLEAR_STRUCT);
1428                 } else
1429                         prev_i = i;
1430         }
1431
1432         if (strip_root) {
1433                 /* we need to strip off the root directory in the case
1434                    of relative paths, but this must be done _after_
1435                    the sorting phase */
1436                 for (i = 0; i < flist->count; i++) {
1437                         if (flist->files[i]->dirname &&
1438                             flist->files[i]->dirname[0] == '/') {
1439                                 memmove(&flist->files[i]->dirname[0],
1440                                         &flist->files[i]->dirname[1],
1441                                         strlen(flist->files[i]->dirname));
1442                         }
1443
1444                         if (flist->files[i]->dirname &&
1445                             !flist->files[i]->dirname[0]) {
1446                                 flist->files[i]->dirname = NULL;
1447                         }
1448                 }
1449         }
1450 }
1451
1452 static void output_flist(struct file_list *flist)
1453 {
1454         char uidbuf[16], gidbuf[16];
1455         struct file_struct *file;
1456         int i;
1457
1458         for (i = 0; i < flist->count; i++) {
1459                 file = flist->files[i];
1460                 if (am_root && preserve_uid)
1461                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1462                 else
1463                         *uidbuf = '\0';
1464                 if (preserve_gid && file->gid != GID_NONE)
1465                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1466                 else
1467                         *gidbuf = '\0';
1468                 rprintf(FINFO, "[%s] i=%d %s %s %s mode=0%o len=%.0f%s%s\n",
1469                         who_am_i(), i, NS(file->basedir), NS(file->dirname),
1470                         NS(file->basename), (int) file->mode,
1471                         (double) file->length, uidbuf, gidbuf);
1472         }
1473 }
1474
1475
1476 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1477
1478 /* Compare the names of two file_struct entities, just like strcmp()
1479  * would do if it were operating on the joined strings.  We assume
1480  * that there are no 0-length strings.
1481  */
1482 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1483 {
1484         int dif;
1485         const uchar *c1, *c2;
1486         enum fnc_state state1, state2;
1487
1488         if (!f1 || !f1->basename) {
1489                 if (!f2 || !f2->basename)
1490                         return 0;
1491                 return -1;
1492         }
1493         if (!f2 || !f2->basename)
1494                 return 1;
1495
1496         if (!(c1 = (uchar*)f1->dirname)) {
1497                 state1 = fnc_BASE;
1498                 c1 = (uchar*)f1->basename;
1499         } else
1500                 state1 = fnc_DIR;
1501         if (!(c2 = (uchar*)f2->dirname)) {
1502                 state2 = fnc_BASE;
1503                 c2 = (uchar*)f2->basename;
1504         } else
1505                 state2 = fnc_DIR;
1506
1507         while (1) {
1508                 if ((dif = (int)*c1 - (int)*c2) != 0)
1509                         break;
1510                 if (!*++c1) {
1511                         switch (state1) {
1512                         case fnc_DIR:
1513                                 state1 = fnc_SLASH;
1514                                 c1 = (uchar*)"/";
1515                                 break;
1516                         case fnc_SLASH:
1517                                 state1 = fnc_BASE;
1518                                 c1 = (uchar*)f1->basename;
1519                                 break;
1520                         case fnc_BASE:
1521                                 break;
1522                         }
1523                 }
1524                 if (!*++c2) {
1525                         switch (state2) {
1526                         case fnc_DIR:
1527                                 state2 = fnc_SLASH;
1528                                 c2 = (uchar*)"/";
1529                                 break;
1530                         case fnc_SLASH:
1531                                 state2 = fnc_BASE;
1532                                 c2 = (uchar*)f2->basename;
1533                                 break;
1534                         case fnc_BASE:
1535                                 if (!*c1)
1536                                         return 0;
1537                                 break;
1538                         }
1539                 }
1540         }
1541
1542         return dif;
1543 }
1544
1545
1546 /* Return a copy of the full filename of a flist entry, using the indicated
1547  * buffer.  No size-checking is done because we checked the size when creating
1548  * the file_struct entry.
1549  */
1550 char *f_name_to(struct file_struct *f, char *fbuf)
1551 {
1552         if (!f || !f->basename)
1553                 return NULL;
1554
1555         if (f->dirname) {
1556                 int len = strlen(f->dirname);
1557                 memcpy(fbuf, f->dirname, len);
1558                 fbuf[len] = '/';
1559                 strcpy(fbuf + len + 1, f->basename);
1560         } else
1561                 strcpy(fbuf, f->basename);
1562         return fbuf;
1563 }
1564
1565
1566 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1567  */
1568 char *f_name(struct file_struct *f)
1569 {
1570         static char names[5][MAXPATHLEN];
1571         static unsigned int n;
1572
1573         n = (n + 1) % (sizeof names / sizeof names[0]);
1574
1575         return f_name_to(f, names[n]);
1576 }