dir.c@ 1980

Last change on this file since 1980 was 1980, checked in by bird, 17 years ago
kmk: Some cleanup.
Property svn:eol-style set to `native`
File size: 36.1 KB

Line
1	/* Directory hashing for GNU Make.
2	Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3	1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software
4	Foundation, Inc.
5	This file is part of GNU Make.
6
7	GNU Make is free software; you can redistribute it and/or modify it under the
8	terms of the GNU General Public License as published by the Free Software
9	Foundation; either version 2, or (at your option) any later version.
10
11	GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
12	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
13	A PARTICULAR PURPOSE. See the GNU General Public License for more details.
14
15	You should have received a copy of the GNU General Public License along with
16	GNU Make; see the file COPYING. If not, write to the Free Software
17	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */
18
19	#include "make.h"
20	#include "hash.h"
21
22	#ifdef HAVE_DIRENT_H
23	# include <dirent.h>
24	# define NAMLEN(dirent) strlen((dirent)->d_name)
25	# ifdef VMS
26	char vmsify (char name, int type);
27	# endif
28	#else
29	# define dirent direct
30	# define NAMLEN(dirent) (dirent)->d_namlen
31	# ifdef HAVE_SYS_NDIR_H
32	# include <sys/ndir.h>
33	# endif
34	# ifdef HAVE_SYS_DIR_H
35	# include <sys/dir.h>
36	# endif
37	# ifdef HAVE_NDIR_H
38	# include <ndir.h>
39	# endif
40	# ifdef HAVE_VMSDIR_H
41	# include "vmsdir.h"
42	# endif /* HAVE_VMSDIR_H */
43	#endif
44	/* bird: FreeBSD + smbfs -> readdir() + EBADF */
45	#ifdef __FreeBSD__
46	# include <sys/mount.h>
47	#endif
48	/* bird: end */
49
50	#ifdef CONFIG_WITH_STRCACHE2
51	# include <stddef.h>
52	#endif
53
54	/* In GNU systems, <dirent.h> defines this macro for us. */
55	#ifdef _D_NAMLEN
56	# undef NAMLEN
57	# define NAMLEN(d) _D_NAMLEN(d)
58	#endif
59
60	#if (defined (POSIX) \|\| defined (VMS) \|\| defined (WINDOWS32)) && !defined (__GNU_LIBRARY__)
61	/* Posix does not require that the d_ino field be present, and some
62	systems do not provide it. */
63	# define REAL_DIR_ENTRY(dp) 1
64	# define FAKE_DIR_ENTRY(dp)
65	#else
66	# define REAL_DIR_ENTRY(dp) (dp->d_ino != 0)
67	# define FAKE_DIR_ENTRY(dp) (dp->d_ino = 1)
68	#endif /* POSIX */
69
70
71	#ifdef __MSDOS__
72	#include <ctype.h>
73	#include <fcntl.h>
74
75	/* If it's MSDOS that doesn't have _USE_LFN, disable LFN support. */
76	#ifndef _USE_LFN
77	#define _USE_LFN 0
78	#endif
79
80	static const char *
81	dosify (const char *filename)
82	{
83	static char dos_filename[14];
84	char *df;
85	int i;
86
87	if (filename == 0 \|\| _USE_LFN)
88	return filename;
89
90	/* FIXME: what about filenames which violate
91	8+3 constraints, like "config.h.in", or ".emacs"? */
92	if (strpbrk (filename, "\"*+,;<=>?[\\]\|") != 0)
93	return filename;
94
95	df = dos_filename;
96
97	/* First, transform the name part. */
98	for (i = 0; filename != '\0' && i < 8 && filename != '.'; ++i)
99	df++ = tolower ((unsigned char)filename++);
100
101	/* Now skip to the next dot. */
102	while (filename != '\0' && filename != '.')
103	++filename;
104	if (*filename != '\0')
105	{
106	df++ = filename++;
107	for (i = 0; filename != '\0' && i < 3 && filename != '.'; ++i)
108	df++ = tolower ((unsigned char)filename++);
109	}
110
111	/* Look for more dots. */
112	while (filename != '\0' && filename != '.')
113	++filename;
114	if (*filename == '.')
115	return filename;
116	*df = 0;
117	return dos_filename;
118	}
119	#endif /* __MSDOS__ */
120
121	#ifdef WINDOWS32
122	#include "pathstuff.h"
123	#endif
124
125	#ifdef _AMIGA
126	#include <ctype.h>
127	#endif
128
129	#ifdef HAVE_CASE_INSENSITIVE_FS
130	static const char *
131	downcase (const char *filename)
132	{
133	static PATH_VAR (new_filename);
134	char *df;
135	int i;
136
137	if (filename == 0)
138	return 0;
139
140	df = new_filename;
141
142	/* First, transform the name part. */
143	while (*filename != '\0')
144	{
145	df++ = tolower ((unsigned char)filename);
146	++filename;
147	}
148
149	*df = 0;
150
151	return new_filename;
152	}
153	#endif /* HAVE_CASE_INSENSITIVE_FS */
154
155	#ifdef VMS
156
157	static int
158	vms_hash (char *name)
159	{
160	int h = 0;
161	int g;
162
163	while (*name)
164	{
165	unsigned char uc = *name;
166	#ifdef HAVE_CASE_INSENSITIVE_FS
167	h = (h << 4) + (isupper (uc) ? tolower (uc) : uc);
168	#else
169	h = (h << 4) + uc;
170	#endif
171	name++;
172	g = h & 0xf0000000;
173	if (g)
174	{
175	h = h ^ (g >> 24);
176	h = h ^ g;
177	}
178	}
179	return h;
180	}
181
182	/* fake stat entry for a directory */
183	static int
184	vmsstat_dir (char name, struct stat st)
185	{
186	char *s;
187	int h;
188	DIR *dir;
189
190	dir = opendir (name);
191	if (dir == 0)
192	return -1;
193	closedir (dir);
194	s = strchr (name, ':'); /* find device */
195	if (s)
196	{
197	*s++ = 0;
198	st->st_dev = (char *)vms_hash (name);
199	h = vms_hash (s);
200	*(s-1) = ':';
201	}
202	else
203	{
204	st->st_dev = 0;
205	s = name;
206	h = vms_hash (s);
207	}
208
209	st->st_ino[0] = h & 0xff;
210	st->st_ino[1] = h & 0xff00;
211	st->st_ino[2] = h >> 16;
212
213	return 0;
214	}
215	#endif /* VMS */
216
217
218	/* Hash table of directories. */
219
220	#ifndef DIRECTORY_BUCKETS
221	#ifdef KMK
222	# define DIRECTORY_BUCKETS 4096
223	# else
224	# define DIRECTORY_BUCKETS 199
225	# endif
226	#endif
227
228	struct directory_contents
229	{
230	dev_t dev; /* Device and inode numbers of this dir. */
231	#ifdef WINDOWS32
232	/* Inode means nothing on WINDOWS32. Even file key information is
233	* unreliable because it is random per file open and undefined for remote
234	* filesystems. The most unique attribute I can come up with is the fully
235	* qualified name of the directory. Beware though, this is also
236	* unreliable. I'm open to suggestion on a better way to emulate inode. */
237	# ifndef CONFIG_WITH_STRCACHE2
238	char *path_key;
239	# else
240	char const path_key; / strcache'ed */
241	# endif
242	int ctime;
243	int mtime; /* controls check for stale directory cache */
244	int fs_flags; /* FS_FAT, FS_NTFS, ... */
245	# define FS_FAT 0x1
246	# define FS_NTFS 0x2
247	# define FS_UNKNOWN 0x4
248	#else
249	# ifdef VMS
250	ino_t ino[3];
251	# else
252	ino_t ino;
253	# endif
254	#endif /* WINDOWS32 */
255	struct hash_table dirfiles; /* Files in this directory. */
256	DIR dirstream; / Stream reading this directory. */
257	};
258
259	static unsigned long
260	directory_contents_hash_1 (const void *key_0)
261	{
262	const struct directory_contents *key = key_0;
263	unsigned long hash;
264
265	#ifdef WINDOWS32
266	# ifndef CONFIG_WITH_STRCACHE2
267	hash = 0;
268	ISTRING_HASH_1 (key->path_key, hash);
269	# else /* CONFIG_WITH_STRCACHE2 */
270	hash = strcache2_calc_ptr_hash (&file_strcache, key->path_key);
271	# endif /* CONFIG_WITH_STRCACHE2 */
272	hash ^= ((unsigned int) key->dev << 4) ^ (unsigned int) key->ctime;
273	#else
274	# ifdef VMS
275	hash = (((unsigned int) key->dev << 4)
276	^ ((unsigned int) key->ino[0]
277	+ (unsigned int) key->ino[1]
278	+ (unsigned int) key->ino[2]));
279	# else
280	hash = ((unsigned int) key->dev << 4) ^ (unsigned int) key->ino;
281	# endif
282	#endif /* WINDOWS32 */
283	return hash;
284	}
285
286	static unsigned long
287	directory_contents_hash_2 (const void *key_0)
288	{
289	const struct directory_contents *key = key_0;
290	unsigned long hash;
291
292	#ifdef WINDOWS32
293	# ifndef CONFIG_WITH_STRCACHE2
294	hash = 0;
295	ISTRING_HASH_2 (key->path_key, hash);
296	# else /* CONFIG_WITH_STRCACHE2 */
297	hash = strcache2_get_hash (&file_strcache, key->path_key);
298	# endif /* CONFIG_WITH_STRCACHE2 */
299	hash ^= ((unsigned int) key->dev << 4) ^ (unsigned int) ~key->ctime;
300	#else
301	# ifdef VMS
302	hash = (((unsigned int) key->dev << 4)
303	^ ~((unsigned int) key->ino[0]
304	+ (unsigned int) key->ino[1]
305	+ (unsigned int) key->ino[2]));
306	# else
307	hash = ((unsigned int) key->dev << 4) ^ (unsigned int) ~key->ino;
308	# endif
309	#endif /* WINDOWS32 */
310
311	return hash;
312	}
313
314	/* Sometimes it's OK to use subtraction to get this value:
315	result = X - Y;
316	But, if we're not sure of the type of X and Y they may be too large for an
317	int (on a 64-bit system for example). So, use ?: instead.
318	See Savannah bug #15534.
319
320	NOTE! This macro has side-effects!
321	*/
322
323	#define MAKECMP(_x,_y) ((_x)<(_y)?-1:((_x)==(_y)?0:1))
324
325	static int
326	directory_contents_hash_cmp (const void xv, const void yv)
327	{
328	const struct directory_contents *x = xv;
329	const struct directory_contents *y = yv;
330	int result;
331
332	#ifdef WINDOWS32
333	# ifndef CONFIG_WITH_STRCACHE2
334	ISTRING_COMPARE (x->path_key, y->path_key, result);
335	if (result)
336	return result;
337	# else /* CONFIG_WITH_STRCACHE2 */
338	if (x->path_key != y->path_key)
339	return -1;
340	# endif /* CONFIG_WITH_STRCACHE2 */
341	result = MAKECMP(x->ctime, y->ctime);
342	if (result)
343	return result;
344	#else
345	# ifdef VMS
346	result = MAKECMP(x->ino[0], y->ino[0]);
347	if (result)
348	return result;
349	result = MAKECMP(x->ino[1], y->ino[1]);
350	if (result)
351	return result;
352	result = MAKECMP(x->ino[2], y->ino[2]);
353	if (result)
354	return result;
355	# else
356	result = MAKECMP(x->ino, y->ino);
357	if (result)
358	return result;
359	# endif
360	#endif /* WINDOWS32 */
361
362	return MAKECMP(x->dev, y->dev);
363	}
364
365	/* Table of directory contents hashed by device and inode number. */
366	static struct hash_table directory_contents;
367
368	#ifdef CONFIG_WITH_ALLOC_CACHES
369	/* Allocation cache for directory contents. */
370	struct alloccache directory_contents_cache;
371	#endif
372
373	struct directory
374	{
375	const char name; / Name of the directory. */
376
377	/* The directory's contents. This data may be shared by several
378	entries in the hash table, which refer to the same directory
379	(identified uniquely by `dev' and `ino') under different names. */
380	struct directory_contents *contents;
381	};
382
383	#ifndef CONFIG_WITH_STRCACHE2
384	static unsigned long
385	directory_hash_1 (const void *key)
386	{
387	return_ISTRING_HASH_1 (((const struct directory *) key)->name);
388	}
389
390	static unsigned long
391	directory_hash_2 (const void *key)
392	{
393	return_ISTRING_HASH_2 (((const struct directory *) key)->name);
394	}
395
396	static int
397	directory_hash_cmp (const void x, const void y)
398	{
399	return_ISTRING_COMPARE (((const struct directory *) x)->name,
400	((const struct directory *) y)->name);
401	}
402	#endif /* !CONFIG_WITH_STRCACHE2 */
403
404	/* Table of directories hashed by name. */
405	static struct hash_table directories;
406
407	#ifdef CONFIG_WITH_ALLOC_CACHES
408	/* Allocation cache for directories. */
409	struct alloccache directories_cache;
410	#endif
411
412	/* Never have more than this many directories open at once. */
413
414	#define MAX_OPEN_DIRECTORIES 10
415
416	static unsigned int open_directories = 0;
417
418
419	/* Hash table of files in each directory. */
420
421	struct dirfile
422	{
423	const char name; / Name of the file. */
424	short length;
425	short impossible; /* This file is impossible. */
426	};
427
428	#ifndef CONFIG_WITH_STRCACHE2
429	static unsigned long
430	dirfile_hash_1 (const void *key)
431	{
432	return_ISTRING_HASH_1 (((struct dirfile const *) key)->name);
433	}
434
435	static unsigned long
436	dirfile_hash_2 (const void *key)
437	{
438	return_ISTRING_HASH_2 (((struct dirfile const *) key)->name);
439	}
440
441	static int
442	dirfile_hash_cmp (const void xv, const void yv)
443	{
444	const struct dirfile *x = xv;
445	const struct dirfile *y = yv;
446	int result = x->length - y->length;
447	if (result)
448	return result;
449	return_ISTRING_COMPARE (x->name, y->name);
450	}
451	#endif /* !CONFIG_WITH_STRCACHE2 */
452
453	#ifndef DIRFILE_BUCKETS
454	#define DIRFILE_BUCKETS 107
455	#endif
456
457	#ifdef CONFIG_WITH_ALLOC_CACHES
458	/* Allocation cache for dirfiles. */
459	struct alloccache dirfile_cache;
460	#endif
461
462
463
464	static int dir_contents_file_exists_p (struct directory_contents *dir,
465	const char *filename);
466	static struct directory find_directory (const char name);
467
468	/* Find the directory named NAME and return its `struct directory'. */
469
470	static struct directory *
471	find_directory (const char *name)
472	{
473	const char *p;
474	struct directory *dir;
475	struct directory **dir_slot;
476	struct directory dir_key;
477	int r;
478	#ifdef WINDOWS32
479	char* w32_path;
480	char fs_label[BUFSIZ];
481	char fs_type[BUFSIZ];
482	unsigned long fs_serno;
483	unsigned long fs_flags;
484	unsigned long fs_len;
485	#endif
486	#ifdef VMS
487	if ((name == '.') && ((name+1) == 0))
488	name = "[]";
489	else
490	name = vmsify (name,1);
491	#endif
492
493	#ifndef CONFIG_WITH_STRCACHE2
494	dir_key.name = name;
495	dir_slot = (struct directory **) hash_find_slot (&directories, &dir_key);
496	#else
497	p = name + strlen (name);
498	dir_key.name = strcache_add_len (name, p - name);
499	dir_slot = (struct directory **) hash_find_slot_strcached (&directories, &dir_key);
500	#endif
501	dir = *dir_slot;
502
503	if (HASH_VACANT (dir))
504	{
505	struct stat st;
506
507	/* The directory was not found. Create a new entry for it. */
508
509	#ifndef CONFIG_WITH_STRCACHE2
510	p = name + strlen (name);
511	#endif
512	#ifndef CONFIG_WITH_ALLOC_CACHES
513	dir = xmalloc (sizeof (struct directory));
514	#else
515	dir = alloccache_alloc (&directories_cache);
516	#endif
517	#ifndef CONFIG_WITH_STRCACHE2
518	dir->name = strcache_add_len (name, p - name);
519	#else
520	dir->name = dir_key.name;
521	#endif
522	hash_insert_at (&directories, dir, dir_slot);
523	/* The directory is not in the name hash table.
524	Find its device and inode numbers, and look it up by them. */
525
526	#ifdef WINDOWS32
527	/* Remove any trailing '\'. Windows32 stat fails even on valid
528	directories if they end in '\'. */
529	if (p[-1] == '\\')
530	((char *)p)[-1] = '\0';
531	#endif
532
533	#ifdef VMS
534	r = vmsstat_dir (name, &st);
535	#else
536	EINTRLOOP (r, stat (name, &st));
537	#endif
538
539	#ifdef WINDOWS32
540	/* Put back the trailing '\'. If we don't, we're permanently
541	truncating the value! */
542	if (p[-1] == '\0')
543	((char *)p)[-1] = '\\';
544	#endif
545
546	if (r < 0)
547	{
548	/* Couldn't stat the directory. Mark this by
549	setting the `contents' member to a nil pointer. */
550	dir->contents = 0;
551	}
552	else
553	{
554	/* Search the contents hash table; device and inode are the key. */
555
556	struct directory_contents *dc;
557	struct directory_contents **dc_slot;
558	struct directory_contents dc_key;
559
560	dc_key.dev = st.st_dev;
561	#ifdef WINDOWS32
562	# ifndef CONFIG_WITH_STRCACHE2
563	dc_key.path_key = w32_path = w32ify (name, 1);
564	# else /* CONFIG_WITH_STRCACHE2 */
565	w32_path = w32ify (name, 1);
566	dc_key.path_key = strcache_add (w32_path);
567	# endif /* CONFIG_WITH_STRCACHE2 */
568	dc_key.ctime = st.st_ctime;
569	#else
570	# ifdef VMS
571	dc_key.ino[0] = st.st_ino[0];
572	dc_key.ino[1] = st.st_ino[1];
573	dc_key.ino[2] = st.st_ino[2];
574	# else
575	dc_key.ino = st.st_ino;
576	# endif
577	#endif
578	dc_slot = (struct directory_contents **) hash_find_slot (&directory_contents, &dc_key);
579	dc = *dc_slot;
580
581	if (HASH_VACANT (dc))
582	{
583	/* Nope; this really is a directory we haven't seen before. */
584
585	#ifndef CONFIG_WITH_ALLOC_CACHES
586	dc = (struct directory_contents *)
587	xmalloc (sizeof (struct directory_contents));
588	#else
589	dc = (struct directory_contents *)
590	alloccache_alloc (&directory_contents_cache);
591	#endif
592
593	/* Enter it in the contents hash table. */
594	dc->dev = st.st_dev;
595	#ifdef WINDOWS32
596	# ifndef CONFIG_WITH_STRCACHE2
597	dc->path_key = xstrdup (w32_path);
598	# else /* CONFIG_WITH_STRCACHE2 */
599	dc->path_key = dc_key.path_key;
600	# endif /* CONFIG_WITH_STRCACHE2 */
601
602	dc->ctime = st.st_ctime;
603	dc->mtime = st.st_mtime;
604
605	/*
606	* NTFS is the only WINDOWS32 filesystem that bumps mtime
607	* on a directory when files are added/deleted from
608	* a directory.
609	*/
610	w32_path[3] = '\0';
611	if (GetVolumeInformation(w32_path,
612	fs_label, sizeof (fs_label),
613	&fs_serno, &fs_len,
614	&fs_flags, fs_type, sizeof (fs_type)) == FALSE)
615	dc->fs_flags = FS_UNKNOWN;
616	else if (!strcmp(fs_type, "FAT"))
617	dc->fs_flags = FS_FAT;
618	else if (!strcmp(fs_type, "NTFS"))
619	dc->fs_flags = FS_NTFS;
620	else
621	dc->fs_flags = FS_UNKNOWN;
622	#else
623	# ifdef VMS
624	dc->ino[0] = st.st_ino[0];
625	dc->ino[1] = st.st_ino[1];
626	dc->ino[2] = st.st_ino[2];
627	# else
628	dc->ino = st.st_ino;
629	# endif
630	#endif /* WINDOWS32 */
631	hash_insert_at (&directory_contents, dc, dc_slot);
632	ENULLLOOP (dc->dirstream, opendir (name));
633	if (dc->dirstream == 0)
634	/* Couldn't open the directory. Mark this by setting the
635	`files' member to a nil pointer. */
636	dc->dirfiles.ht_vec = 0;
637	else
638	{
639	#ifdef KMK
640	int buckets = st.st_nlink * 2;
641	if (buckets < DIRFILE_BUCKETS)
642	buckets = DIRFILE_BUCKETS;
643	hash_init_strcached (&dc->dirfiles, buckets, &file_strcache,
644	offsetof (struct dirfile, name));
645	#else
646	# ifndef CONFIG_WITH_STRCACHE2
647	hash_init (&dc->dirfiles, DIRFILE_BUCKETS,
648	dirfile_hash_1, dirfile_hash_2, dirfile_hash_cmp);
649	# else /* CONFIG_WITH_STRCACHE2 */
650	hash_init_strcached (&dc->dirfiles, DIRFILE_BUCKETS,
651	&file_strcache,
652	offsetof (struct dirfile, name));
653	# endif /* CONFIG_WITH_STRCACHE2 */
654	#endif
655	/* Keep track of how many directories are open. */
656	++open_directories;
657	if (open_directories == MAX_OPEN_DIRECTORIES)
658	/* We have too many directories open already.
659	Read the entire directory and then close it. */
660	dir_contents_file_exists_p (dc, 0);
661	}
662	}
663
664	/* Point the name-hashed entry for DIR at its contents data. */
665	dir->contents = dc;
666	}
667	}
668
669	return dir;
670	}
671
672
673	/* Return 1 if the name FILENAME is entered in DIR's hash table.
674	FILENAME must contain no slashes. */
675
676	static int
677	dir_contents_file_exists_p (struct directory_contents *dir,
678	const char *filename)
679	{
680	unsigned int hash;
681	struct dirfile *df;
682	struct dirent *d;
683	#ifdef WINDOWS32
684	struct stat st;
685	int rehash = 0;
686	#endif
687
688	if (dir == 0 \|\| dir->dirfiles.ht_vec == 0)
689	/* The directory could not be stat'd or opened. */
690	return 0;
691
692	#ifdef __MSDOS__
693	filename = dosify (filename);
694	#endif
695
696	#ifdef HAVE_CASE_INSENSITIVE_FS
697	filename = downcase (filename);
698	#endif
699
700	#ifdef __EMX__
701	if (filename != 0)
702	_fnlwr (filename); /* lower case for FAT drives */
703	#endif
704
705	#ifdef VMS
706	filename = vmsify (filename,0);
707	#endif
708
709	hash = 0;
710	if (filename != 0)
711	{
712	struct dirfile dirfile_key;
713
714	if (*filename == '\0')
715	{
716	/* Checking if the directory exists. */
717	return 1;
718	}
719	#ifndef CONFIG_WITH_STRCACHE2
720	dirfile_key.name = filename;
721	dirfile_key.length = strlen (filename);
722	df = hash_find_item (&dir->dirfiles, &dirfile_key);
723	#else /* CONFIG_WITH_STRCACHE2 */
724	dirfile_key.length = strlen (filename);
725	dirfile_key.name = filename
726	= strcache_add_len (filename, dirfile_key.length);
727	df = hash_find_item_strcached (&dir->dirfiles, &dirfile_key);
728	#endif /* CONFIG_WITH_STRCACHE2 */
729	if (df)
730	return !df->impossible;
731	}
732
733	/* The file was not found in the hashed list.
734	Try to read the directory further. */
735
736	if (dir->dirstream == 0)
737	{
738	#ifdef WINDOWS32
739	/*
740	* Check to see if directory has changed since last read. FAT
741	* filesystems force a rehash always as mtime does not change
742	* on directories (ugh!).
743	*/
744	if (dir->path_key)
745	{
746	if ((dir->fs_flags & FS_FAT) != 0)
747	{
748	dir->mtime = time ((time_t *) 0);
749	rehash = 1;
750	}
751	else if (stat (dir->path_key, &st) == 0 && st.st_mtime > dir->mtime)
752	{
753	/* reset date stamp to show most recent re-process. */
754	dir->mtime = st.st_mtime;
755	rehash = 1;
756	}
757
758	/* If it has been already read in, all done. */
759	if (!rehash)
760	return 0;
761
762	/* make sure directory can still be opened; if not return. */
763	dir->dirstream = opendir (dir->path_key);
764	if (!dir->dirstream)
765	return 0;
766	}
767	else
768	#endif
769	/* The directory has been all read in. */
770	return 0;
771	}
772
773	while (1)
774	{
775	/* Enter the file in the hash table. */
776	unsigned int len;
777	struct dirfile dirfile_key;
778	struct dirfile **dirfile_slot;
779
780	ENULLLOOP (d, readdir (dir->dirstream));
781	if (d == 0)
782	{
783	/* bird: Workaround for smbfs mounts returning EBADF at the end of the search.
784	To exactly determin the cause here, I should probably do some smbfs
785	tracing, but for now just ignoring the EBADF on seems to work.
786	(The smb server is 64-bit vista, btw.) */
787	#if defined (__FreeBSD__)
788	struct statfs stfs;
789	int saved_errno = errno;
790	errno = 0;
791	if (saved_errno == EBADF
792	&& !fstatfs (dirfd (dir->dirstream), &stfs)
793	&& !(stfs.f_flags & MNT_LOCAL)
794	&& !strcmp(stfs.f_fstypename, "smbfs"))
795	{
796	/*fprintf (stderr, "EBADF on remote fs! dirfd=%d errno=%d\n",
797	dirfd (dir->dirstream), errno);*/
798	saved_errno = 0;
799	}
800	errno = saved_errno;
801	#endif
802	/* bird: end */
803	if (errno)
804	fatal (NILF, "INTERNAL: readdir(%p): %s (filename=%s)\n", (void *)dir, strerror (errno), filename);
805	break;
806	}
807
808	#if defined(VMS) && defined(HAVE_DIRENT_H)
809	/* In VMS we get file versions too, which have to be stripped off */
810	{
811	char *p = strrchr (d->d_name, ';');
812	if (p)
813	*p = '\0';
814	}
815	#endif
816	if (!REAL_DIR_ENTRY (d))
817	continue;
818
819	len = NAMLEN (d);
820	#ifndef CONFIG_WITH_STRCACHE2
821	dirfile_key.name = d->d_name;
822	dirfile_key.length = len;
823	dirfile_slot = (struct dirfile **) hash_find_slot (&dir->dirfiles, &dirfile_key);
824	#else
825	dirfile_key.name = strcache_add_len (d->d_name, len);
826	dirfile_key.length = len;
827	dirfile_slot = (struct dirfile **) hash_find_slot_strcached (&dir->dirfiles, &dirfile_key);
828	#endif
829	#ifdef WINDOWS32
830	/*
831	* If re-reading a directory, don't cache files that have
832	* already been discovered.
833	*/
834	if (! rehash \|\| HASH_VACANT (*dirfile_slot))
835	#endif
836	{
837	#ifndef CONFIG_WITH_ALLOC_CACHES
838	df = xmalloc (sizeof (struct dirfile));
839	#else
840	df = alloccache_alloc (&dirfile_cache);
841	#endif
842	#ifndef CONFIG_WITH_STRCACHE2
843	df->name = strcache_add_len (d->d_name, len);
844	#else
845	df->name = dirfile_key.name;
846	#endif
847	df->length = len;
848	df->impossible = 0;
849	hash_insert_at (&dir->dirfiles, df, dirfile_slot);
850	}
851	/* Check if the name matches the one we're searching for. */
852	#ifndef CONFIG_WITH_STRCACHE2
853	if (filename != 0 && strieq (d->d_name, filename))
854	#else
855	if (filename != 0 && dirfile_key.name == filename)
856	#endif
857	return 1;
858	}
859
860	/* If the directory has been completely read in,
861	close the stream and reset the pointer to nil. */
862	if (d == 0)
863	{
864	--open_directories;
865	closedir (dir->dirstream);
866	dir->dirstream = 0;
867	}
868	return 0;
869	}
870
871	/* Return 1 if the name FILENAME in directory DIRNAME
872	is entered in the dir hash table.
873	FILENAME must contain no slashes. */
874
875	int
876	dir_file_exists_p (const char dirname, const char filename)
877	{
878	return dir_contents_file_exists_p (find_directory (dirname)->contents,
879	filename);
880	}
881
882
883	/* Return 1 if the file named NAME exists. */
884
885	int
886	file_exists_p (const char *name)
887	{
888	const char *dirend;
889	const char *dirname;
890	const char *slash;
891
892	#ifndef NO_ARCHIVES
893	if (ar_name (name))
894	return ar_member_date (name) != (time_t) -1;
895	#endif
896
897	#ifdef VMS
898	dirend = strrchr (name, ']');
899	if (dirend == 0)
900	dirend = strrchr (name, ':');
901	if (dirend == 0)
902	return dir_file_exists_p ("[]", name);
903	#else /* !VMS */
904	dirend = strrchr (name, '/');
905	#ifdef HAVE_DOS_PATHS
906	/* Forward and backslashes might be mixed. We need the rightmost one. */
907	{
908	const char *bslash = strrchr(name, '\\');
909	if (!dirend \|\| bslash > dirend)
910	dirend = bslash;
911	/* The case of "d:file". */
912	if (!dirend && name[0] && name[1] == ':')
913	dirend = name + 1;
914	}
915	#endif /* HAVE_DOS_PATHS */
916	if (dirend == 0)
917	#ifndef _AMIGA
918	return dir_file_exists_p (".", name);
919	#else /* !VMS && !AMIGA */
920	return dir_file_exists_p ("", name);
921	#endif /* AMIGA */
922	#endif /* VMS */
923
924	slash = dirend;
925	if (dirend == name)
926	dirname = "/";
927	else
928	{
929	char *p;
930	#ifdef HAVE_DOS_PATHS
931	/* d:/ and d: are very different... */
932	if (dirend < name + 3 && name[1] == ':' &&
933	(dirend == '/' \|\| dirend == '\\' \|\| *dirend == ':'))
934	dirend++;
935	#endif
936	p = alloca (dirend - name + 1);
937	memcpy (p, name, dirend - name);
938	p[dirend - name] = '\0';
939	dirname = p;
940	}
941	return dir_file_exists_p (dirname, slash + 1);
942	}
943
944
945	/* Mark FILENAME as `impossible' for `file_impossible_p'.
946	This means an attempt has been made to search for FILENAME
947	as an intermediate file, and it has failed. */
948
949	void
950	file_impossible (const char *filename)
951	{
952	const char *dirend;
953	const char *p = filename;
954	struct directory *dir;
955	struct dirfile *new;
956
957	#ifdef VMS
958	dirend = strrchr (p, ']');
959	if (dirend == 0)
960	dirend = strrchr (p, ':');
961	dirend++;
962	if (dirend == (char *)1)
963	dir = find_directory ("[]");
964	#else
965	dirend = strrchr (p, '/');
966	# ifdef HAVE_DOS_PATHS
967	/* Forward and backslashes might be mixed. We need the rightmost one. */
968	{
969	const char *bslash = strrchr(p, '\\');
970	if (!dirend \|\| bslash > dirend)
971	dirend = bslash;
972	/* The case of "d:file". */
973	if (!dirend && p[0] && p[1] == ':')
974	dirend = p + 1;
975	}
976	# endif /* HAVE_DOS_PATHS */
977	if (dirend == 0)
978	# ifdef _AMIGA
979	dir = find_directory ("");
980	# else /* !VMS && !AMIGA */
981	dir = find_directory (".");
982	# endif /* AMIGA */
983	#endif /* VMS */
984	else
985	{
986	const char *dirname;
987	const char *slash = dirend;
988	if (dirend == p)
989	dirname = "/";
990	else
991	{
992	char *cp;
993	#ifdef HAVE_DOS_PATHS
994	/* d:/ and d: are very different... */
995	if (dirend < p + 3 && p[1] == ':' &&
996	(dirend == '/' \|\| dirend == '\\' \|\| *dirend == ':'))
997	dirend++;
998	#endif
999	cp = alloca (dirend - p + 1);
1000	memcpy (cp, p, dirend - p);
1001	cp[dirend - p] = '\0';
1002	dirname = cp;
1003	}
1004	dir = find_directory (dirname);
1005	filename = p = slash + 1;
1006	}
1007
1008	if (dir->contents == 0)
1009	{
1010	/* The directory could not be stat'd. We allocate a contents
1011	structure for it, but leave it out of the contents hash table. */
1012	#ifndef CONFIG_WITH_ALLOC_CACHES
1013	dir->contents = xmalloc (sizeof (struct directory_contents));
1014	#else
1015	dir->contents = alloccache_alloc (&directory_contents_cache);
1016	#endif
1017	memset (dir->contents, '\0', sizeof (struct directory_contents));
1018	}
1019
1020	if (dir->contents->dirfiles.ht_vec == 0)
1021	{
1022	#ifndef CONFIG_WITH_STRCACHE2
1023	hash_init (&dir->contents->dirfiles, DIRFILE_BUCKETS,
1024	dirfile_hash_1, dirfile_hash_2, dirfile_hash_cmp);
1025	#else /* CONFIG_WITH_STRCACHE2 */
1026	hash_init_strcached (&dir->contents->dirfiles, DIRFILE_BUCKETS,
1027	&file_strcache, offsetof (struct dirfile, name));
1028	#endif /* CONFIG_WITH_STRCACHE2 */
1029	}
1030
1031	/* Make a new entry and put it in the table. */
1032
1033	#ifndef CONFIG_WITH_ALLOC_CACHES
1034	new = xmalloc (sizeof (struct dirfile));
1035	#else
1036	new = alloccache_alloc (&dirfile_cache);
1037	#endif
1038	new->length = strlen (filename);
1039	new->name = strcache_add_len (filename, new->length);
1040	new->impossible = 1;
1041	#ifndef CONFIG_WITH_STRCACHE2
1042	hash_insert (&dir->contents->dirfiles, new);
1043	#else /* CONFIG_WITH_STRCACHE2 */
1044	hash_insert_strcached (&dir->contents->dirfiles, new);
1045	#endif /* CONFIG_WITH_STRCACHE2 */
1046	}
1047
1048
1049	/* Return nonzero if FILENAME has been marked impossible. */
1050
1051	int
1052	file_impossible_p (const char *filename)
1053	{
1054	const char *dirend;
1055	const char *p = filename;
1056	struct directory_contents *dir;
1057	struct dirfile *dirfile;
1058	struct dirfile dirfile_key;
1059
1060	#ifdef VMS
1061	dirend = strrchr (filename, ']');
1062	if (dirend == 0)
1063	dir = find_directory ("[]")->contents;
1064	#else
1065	dirend = strrchr (filename, '/');
1066	#ifdef HAVE_DOS_PATHS
1067	/* Forward and backslashes might be mixed. We need the rightmost one. */
1068	{
1069	const char *bslash = strrchr(filename, '\\');
1070	if (!dirend \|\| bslash > dirend)
1071	dirend = bslash;
1072	/* The case of "d:file". */
1073	if (!dirend && filename[0] && filename[1] == ':')
1074	dirend = filename + 1;
1075	}
1076	#endif /* HAVE_DOS_PATHS */
1077	if (dirend == 0)
1078	#ifdef _AMIGA
1079	dir = find_directory ("")->contents;
1080	#else /* !VMS && !AMIGA */
1081	dir = find_directory (".")->contents;
1082	#endif /* AMIGA */
1083	#endif /* VMS */
1084	else
1085	{
1086	const char *dirname;
1087	const char *slash = dirend;
1088	if (dirend == filename)
1089	dirname = "/";
1090	else
1091	{
1092	char *cp;
1093	#ifdef HAVE_DOS_PATHS
1094	/* d:/ and d: are very different... */
1095	if (dirend < filename + 3 && filename[1] == ':' &&
1096	(dirend == '/' \|\| dirend == '\\' \|\| *dirend == ':'))
1097	dirend++;
1098	#endif
1099	cp = alloca (dirend - filename + 1);
1100	memcpy (cp, p, dirend - p);
1101	cp[dirend - p] = '\0';
1102	dirname = cp;
1103	}
1104	dir = find_directory (dirname)->contents;
1105	p = filename = slash + 1;
1106	}
1107
1108	if (dir == 0 \|\| dir->dirfiles.ht_vec == 0)
1109	/* There are no files entered for this directory. */
1110	return 0;
1111
1112	#ifdef __MSDOS__
1113	filename = dosify (p);
1114	#endif
1115	#ifdef HAVE_CASE_INSENSITIVE_FS
1116	filename = downcase (p);
1117	#endif
1118	#ifdef VMS
1119	filename = vmsify (p, 1);
1120	#endif
1121
1122	#ifndef CONFIG_WITH_STRCACHE2
1123	dirfile_key.name = filename;
1124	dirfile_key.length = strlen (filename);
1125	dirfile = hash_find_item (&dir->dirfiles, &dirfile_key);
1126	#else
1127	dirfile_key.length = strlen (filename);
1128	dirfile_key.name = strcache_add_len (filename, dirfile_key.length);
1129	dirfile = hash_find_item_strcached (&dir->dirfiles, &dirfile_key);
1130	#endif
1131	if (dirfile)
1132	return dirfile->impossible;
1133
1134	return 0;
1135	}
1136
1137
1138	/* Return the already allocated name in the
1139	directory hash table that matches DIR. */
1140
1141	const char *
1142	dir_name (const char *dir)
1143	{
1144	return find_directory (dir)->name;
1145	}
1146
1147
1148	/* Print the data base of directories. */
1149
1150	void
1151	print_dir_data_base (void)
1152	{
1153	unsigned int files;
1154	unsigned int impossible;
1155	struct directory **dir_slot;
1156	struct directory **dir_end;
1157
1158	puts (_("\n# Directories\n"));
1159
1160	files = impossible = 0;
1161
1162	dir_slot = (struct directory **) directories.ht_vec;
1163	dir_end = dir_slot + directories.ht_size;
1164	for ( ; dir_slot < dir_end; dir_slot++)
1165	{
1166	struct directory dir = dir_slot;
1167	if (! HASH_VACANT (dir))
1168	{
1169	if (dir->contents == 0)
1170	printf (_("# %s: could not be stat'd.\n"), dir->name);
1171	else if (dir->contents->dirfiles.ht_vec == 0)
1172	{
1173	#ifdef WINDOWS32
1174	printf (_("# %s (key %s, mtime %d): could not be opened.\n"),
1175	dir->name, dir->contents->path_key,dir->contents->mtime);
1176	#else /* WINDOWS32 */
1177	#ifdef VMS
1178	printf (_("# %s (device %d, inode [%d,%d,%d]): could not be opened.\n"),
1179	dir->name, dir->contents->dev,
1180	dir->contents->ino[0], dir->contents->ino[1],
1181	dir->contents->ino[2]);
1182	#else
1183	printf (_("# %s (device %ld, inode %ld): could not be opened.\n"),
1184	dir->name, (long int) dir->contents->dev,
1185	(long int) dir->contents->ino);
1186	#endif
1187	#endif /* WINDOWS32 */
1188	}
1189	else
1190	{
1191	unsigned int f = 0;
1192	unsigned int im = 0;
1193	struct dirfile **files_slot;
1194	struct dirfile **files_end;
1195
1196	files_slot = (struct dirfile **) dir->contents->dirfiles.ht_vec;
1197	files_end = files_slot + dir->contents->dirfiles.ht_size;
1198	for ( ; files_slot < files_end; files_slot++)
1199	{
1200	struct dirfile df = files_slot;
1201	if (! HASH_VACANT (df))
1202	{
1203	if (df->impossible)
1204	++im;
1205	else
1206	++f;
1207	}
1208	}
1209	#ifdef WINDOWS32
1210	printf (_("# %s (key %s, mtime %d): "),
1211	dir->name, dir->contents->path_key, dir->contents->mtime);
1212	#else /* WINDOWS32 */
1213	#ifdef VMS
1214	printf (_("# %s (device %d, inode [%d,%d,%d]): "),
1215	dir->name, dir->contents->dev,
1216	dir->contents->ino[0], dir->contents->ino[1],
1217	dir->contents->ino[2]);
1218	#else
1219	printf (_("# %s (device %ld, inode %ld): "),
1220	dir->name,
1221	(long)dir->contents->dev, (long)dir->contents->ino);
1222	#endif
1223	#endif /* WINDOWS32 */
1224	if (f == 0)
1225	fputs (_("No"), stdout);
1226	else
1227	printf ("%u", f);
1228	fputs (_(" files, "), stdout);
1229	if (im == 0)
1230	fputs (_("no"), stdout);
1231	else
1232	printf ("%u", im);
1233	fputs (_(" impossibilities"), stdout);
1234	if (dir->contents->dirstream == 0)
1235	puts (".");
1236	else
1237	puts (_(" so far."));
1238	files += f;
1239	impossible += im;
1240	#ifdef KMK
1241	fputs ("# ", stdout);
1242	hash_print_stats (&dir->contents->dirfiles, stdout);
1243	fputs ("\n", stdout);
1244	#endif
1245	}
1246	}
1247	}
1248
1249	fputs ("\n# ", stdout);
1250	if (files == 0)
1251	fputs (_("No"), stdout);
1252	else
1253	printf ("%u", files);
1254	fputs (_(" files, "), stdout);
1255	if (impossible == 0)
1256	fputs (_("no"), stdout);
1257	else
1258	printf ("%u", impossible);
1259	printf (_(" impossibilities in %lu directories.\n"), directories.ht_fill);
1260	#ifdef KMK
1261	fputs ("# directories: ", stdout);
1262	hash_print_stats (&directories, stdout);
1263	fputs ("\n# directory_contents: ", stdout);
1264	hash_print_stats (&directory_contents, stdout);
1265	fputs ("\n", stdout);
1266	#endif
1267	}
1268
1269
1270	/* Hooks for globbing. */
1271
1272	#include <glob.h>
1273
1274	/* Structure describing state of iterating through a directory hash table. */
1275
1276	struct dirstream
1277	{
1278	struct directory_contents contents; / The directory being read. */
1279	struct dirfile *dirfile_slot; / Current slot in table. */
1280	};
1281
1282	/* Forward declarations. */
1283	static __ptr_t open_dirstream (const char *);
1284	static struct dirent *read_dirstream (__ptr_t);
1285
1286	static __ptr_t
1287	open_dirstream (const char *directory)
1288	{
1289	struct dirstream *new;
1290	struct directory *dir = find_directory (directory);
1291
1292	if (dir->contents == 0 \|\| dir->contents->dirfiles.ht_vec == 0)
1293	/* DIR->contents is nil if the directory could not be stat'd.
1294	DIR->contents->dirfiles is nil if it could not be opened. */
1295	return 0;
1296
1297	/* Read all the contents of the directory now. There is no benefit
1298	in being lazy, since glob will want to see every file anyway. */
1299
1300	dir_contents_file_exists_p (dir->contents, 0);
1301
1302	new = xmalloc (sizeof (struct dirstream));
1303	new->contents = dir->contents;
1304	new->dirfile_slot = (struct dirfile **) new->contents->dirfiles.ht_vec;
1305
1306	return (__ptr_t) new;
1307	}
1308
1309	static struct dirent *
1310	read_dirstream (__ptr_t stream)
1311	{
1312	static char *buf;
1313	static unsigned int bufsz;
1314
1315	struct dirstream const ds = (struct dirstream ) stream;
1316	struct directory_contents *dc = ds->contents;
1317	struct dirfile dirfile_end = (struct dirfile ) dc->dirfiles.ht_vec + dc->dirfiles.ht_size;
1318
1319	while (ds->dirfile_slot < dirfile_end)
1320	{
1321	struct dirfile df = ds->dirfile_slot++;
1322	if (! HASH_VACANT (df) && !df->impossible)
1323	{
1324	/* The glob interface wants a `struct dirent', so mock one up. */
1325	struct dirent *d;
1326	unsigned int len = df->length + 1;
1327	unsigned int sz = sizeof (*d) - sizeof (d->d_name) + len;
1328	if (sz > bufsz)
1329	{
1330	bufsz *= 2;
1331	if (sz > bufsz)
1332	bufsz = sz;
1333	buf = xrealloc (buf, bufsz);
1334	}
1335	d = (struct dirent *) buf;
1336	#ifdef __MINGW32__
1337	# if __MINGW32_MAJOR_VERSION < 3 \|\| (__MINGW32_MAJOR_VERSION == 3 && \
1338	__MINGW32_MINOR_VERSION == 0)
1339	d->d_name = xmalloc(len);
1340	# endif
1341	#endif
1342	FAKE_DIR_ENTRY (d);
1343	#ifdef _DIRENT_HAVE_D_NAMLEN
1344	d->d_namlen = len - 1;
1345	#endif
1346	#ifdef _DIRENT_HAVE_D_TYPE
1347	d->d_type = DT_UNKNOWN;
1348	#endif
1349	memcpy (d->d_name, df->name, len);
1350	return d;
1351	}
1352	}
1353
1354	return 0;
1355	}
1356
1357	static void
1358	ansi_free (void *p)
1359	{
1360	if (p)
1361	free(p);
1362	}
1363
1364	/* On 64 bit ReliantUNIX (5.44 and above) in LFS mode, stat() is actually a
1365	* macro for stat64(). If stat is a macro, make a local wrapper function to
1366	* invoke it.
1367	*/
1368	#ifndef stat
1369	# ifndef VMS
1370	int stat (const char path, struct stat sbuf);
1371	# endif
1372	# define local_stat stat
1373	#else
1374	static int
1375	local_stat (const char path, struct stat buf)
1376	{
1377	int e;
1378
1379	EINTRLOOP (e, stat (path, buf));
1380	return e;
1381	}
1382	#endif
1383
1384	void
1385	dir_setup_glob (glob_t *gl)
1386	{
1387	gl->gl_opendir = open_dirstream;
1388	gl->gl_readdir = read_dirstream;
1389	gl->gl_closedir = ansi_free;
1390	gl->gl_stat = local_stat;
1391	#ifdef __EMX__ /* The FreeBSD implementation actually uses gl_lstat!! */
1392	gl->gl_lstat = local_stat;
1393	#endif
1394	/* We don't bother setting gl_lstat, since glob never calls it.
1395	The slot is only there for compatibility with 4.4 BSD. */
1396	}
1397
1398	void
1399	hash_init_directories (void)
1400	{
1401	#ifndef CONFIG_WITH_STRCACHE2
1402	hash_init (&directories, DIRECTORY_BUCKETS,
1403	directory_hash_1, directory_hash_2, directory_hash_cmp);
1404	#else /* CONFIG_WITH_STRCACHE2 */
1405	hash_init_strcached (&directories, DIRECTORY_BUCKETS, &file_strcache,
1406	offsetof (struct directory, name));
1407	#endif /* CONFIG_WITH_STRCACHE2 */
1408	hash_init (&directory_contents, DIRECTORY_BUCKETS,
1409	directory_contents_hash_1, directory_contents_hash_2,
1410	directory_contents_hash_cmp);
1411	#ifdef CONFIG_WITH_ALLOC_CACHES
1412	alloccache_init (&directories_cache, sizeof (struct directory),
1413	"directories", NULL, NULL);
1414	alloccache_init (&directory_contents_cache, sizeof (struct directory_contents),
1415	"directory_contents", NULL, NULL);
1416	alloccache_init (&dirfile_cache, sizeof (struct dirfile),
1417	"dirfile", NULL, NULL);
1418	#endif /* CONFIG_WITH_ALLOC_CACHES */
1419	}

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source: kBuild/trunk/src/kmk/dir.c@ 1980

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