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Formerly dir.c.~4~

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This commit is contained in:
Roland McGrath 1992-10-09 17:35:07 +00:00
parent 9603279fb8
commit 46ccc784fe
1 changed files with 135 additions and 48 deletions
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183
dir.c
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@ -53,21 +53,39 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#else
#define REAL_DIR_ENTRY(dp) (dp->d_ino != 0)
#endif /* POSIX */
/* Hash table of directories. */
struct directory
#ifndef DIRECTORY_BUCKETS
#define DIRECTORY_BUCKETS 199
#endif
struct directory_contents
{
struct directory *next;
char *name; /* Name of the directory. */
struct directory_contents *next;
int dev, ino; /* Device and inode numbers of this dir. */
struct dirfile **files; /* Files in this directory. */
DIR *dirstream; /* Stream reading this directory. */
};
#ifndef DIRECTORY_BUCKETS
#define DIRECTORY_BUCKETS 23
#endif
/* Table of directory contents hashed by device and inode number. */
static struct directory_contents *directories_contents[DIRECTORY_BUCKETS];
struct directory
{
struct directory *next;
char *name; /* Name of the directory. */
/* The directory's contents. This data may be shared by several
entries in the hash table, which refer to the same directory
(identified uniquely by `dev' and `ino') under different names. */
struct directory_contents *contents;
};
/* Table of directories hashed by name. */
static struct directory *directories[DIRECTORY_BUCKETS];
@ -88,9 +106,11 @@ struct dirfile
};
#ifndef DIRFILE_BUCKETS
#define DIRFILE_BUCKETS 1007
#define DIRFILE_BUCKETS 107
#endif
static int dir_contents_file_exists_p ();
/* Find the directory named NAME and return its `struct directory'. */
static struct directory *
@ -111,54 +131,93 @@ find_directory (name)
if (dir == 0)
{
/* The directory was not found. Create a new entry
for it and start its directory stream reading. */
struct stat st;
/* The directory was not found. Create a new entry for it. */
dir = (struct directory *) xmalloc (sizeof (struct directory));
dir->next = directories[hash];
directories[hash] = dir;
dir->name = savestring (name, p - name);
dir->dirstream = opendir (name);
if (dir->dirstream == 0)
/* Couldn't open the directory. Mark this by
setting the `files' member to a nil pointer. */
dir->files = 0;
/* The directory is not in the name hash table.
Find its device and inode numbers, and look it up by them. */
if (stat (name, &st) < 0)
/* Couldn't stat the directory. Mark this by
setting the `contents' member to a nil pointer. */
dir->contents = 0;
else
{
/* Allocate an array of hash buckets for files and zero it. */
dir->files = (struct dirfile **)
xmalloc (sizeof (struct dirfile) * DIRFILE_BUCKETS);
bzero ((char *) dir->files,
sizeof (struct dirfile) * DIRFILE_BUCKETS);
/* Search the contents hash table; device and inode are the key. */
/* Keep track of how many directories are open. */
++open_directories;
if (open_directories == MAX_OPEN_DIRECTORIES)
/* Read the entire directory and then close it. */
(void) dir_file_exists_p (dir->name, (char *) 0);
struct directory_contents *dc;
hash = ((unsigned int) st.st_dev << 16) | (unsigned int) st.st_ino;
hash %= DIRECTORY_BUCKETS;
for (dc = directories_contents[hash]; dc != 0; dc = dc->next)
if (dc->dev == st.st_dev && dc->ino == st.st_ino)
break;
if (dc == 0)
{
/* Nope; this really is a directory we haven't seen before. */
dc = (struct directory_contents *)
xmalloc (sizeof (struct directory_contents));
/* Enter it in the contents hash table. */
dc->dev = st.st_dev;
dc->ino = st.st_ino;
dc->next = directories_contents[hash];
directories_contents[hash] = dc;
dc->dirstream = opendir (name);
if (dc->dirstream == 0)
/* Couldn't open the directory. Mark this by
setting the `files' member to a nil pointer. */
dc->files = 0;
else
{
/* Allocate an array of buckets for files and zero it. */
dc->files = (struct dirfile **)
xmalloc (sizeof (struct dirfile *) * DIRFILE_BUCKETS);
bzero ((char *) dc->files,
sizeof (struct dirfile *) * DIRFILE_BUCKETS);
/* Keep track of how many directories are open. */
++open_directories;
if (open_directories == MAX_OPEN_DIRECTORIES)
/* We have too many directories open already.
Read the entire directory and then close it. */
(void) dir_contents_file_exists_p (dc, (char *) 0);
}
}
/* Point the name-hashed entry for DIR at its contents data. */
dir->contents = dc;
}
}
return dir;
}
/* Return 1 if the name FILENAME in directory DIRNAME
is entered in the dir hash table.
/* Return 1 if the name FILENAME is entered in DIR's hash table.
FILENAME must contain no slashes. */
int
dir_file_exists_p (dirname, filename)
register char *dirname;
static int
dir_contents_file_exists_p (dir, filename)
register struct directory_contents *dir;
register char *filename;
{
register unsigned int hash;
register char *p;
register struct directory *dir;
register struct dirfile *df;
register struct dirent *d;
dir = find_directory (dirname);
if (dir->files == 0)
/* The directory could not be opened. */
if (dir == 0 || dir->files == 0)
/* The directory could not be stat'd or opened. */
return 0;
hash = 0;
@ -222,6 +281,19 @@ dir_file_exists_p (dirname, filename)
return 0;
}
/* Return 1 if the name FILENAME in directory DIRNAME
is entered in the dir hash table.
FILENAME must contain no slashes. */
int
dir_file_exists_p (dirname, filename)
register char *dirname;
register char *filename;
{
return dir_contents_file_exists_p (find_directory (dirname)->contents,
filename);
}
/* Return 1 if the file named NAME exists. */
@ -277,19 +349,30 @@ file_impossible (filename)
HASH (hash, *p);
hash %= DIRFILE_BUCKETS;
if (dir->files == 0)
if (dir->contents == 0)
{
/* The directory could not be stat'd. We allocate a contents
structure for it, but leave it out of the contents hash table. */
dir->contents = (struct directory_contents *)
xmalloc (sizeof (struct directory_contents));
dir->contents->dev = dir->contents->ino = 0;
dir->contents->files = 0;
}
if (dir->contents->files == 0)
{
/* The directory was not opened; we must allocate the hash buckets. */
dir->files = (struct dirfile **)
dir->contents->files = (struct dirfile **)
xmalloc (sizeof (struct dirfile) * DIRFILE_BUCKETS);
bzero ((char *) dir->files, sizeof (struct dirfile) * DIRFILE_BUCKETS);
bzero ((char *) dir->contents->files,
sizeof (struct dirfile) * DIRFILE_BUCKETS);
}
/* Make a new entry and put it in the table. */
new = (struct dirfile *) xmalloc (sizeof (struct dirfile));
new->next = dir->files[hash];
dir->files[hash] = new;
new->next = dir->contents->files[hash];
dir->contents->files[hash] = new;
new->name = savestring (filename, strlen (filename));
new->impossible = 1;
}
@ -303,22 +386,22 @@ file_impossible_p (filename)
char *dirend;
register char *p = filename;
register unsigned int hash;
register struct directory *dir;
register struct directory_contents *dir;
register struct dirfile *next;
dirend = rindex (filename, '/');
if (dirend == 0)
dir = find_directory (".");
dir = find_directory (".")->contents;
else
{
char *dirname = (char *) alloca (dirend - filename + 1);
bcopy (p, dirname, dirend - p);
dirname[dirend - p] = '\0';
dir = find_directory (dirname);
dir = find_directory (dirname)->contents;
p = dirend + 1;
}
if (dir->files == 0)
if (dir == 0 || dir->files == 0)
/* There are no files entered for this directory. */
return 0;
@ -358,20 +441,24 @@ print_dir_data_base ()
for (dir = directories[i]; dir != 0; dir = dir->next)
{
++dirs;
if (dir->files == 0)
printf ("# %s: could not be opened.\n", dir->name);
if (dir->contents == 0)
printf ("# %s: could not be stat'd.\n", dir->name);
else if (dir->contents->files == 0)
printf ("# %s (device %d, inode %d): could not be opened.\n",
dir->name, dir->contents->dev, dir->contents->ino);
else
{
register unsigned int f = 0, im = 0;
register unsigned int j;
register struct dirfile *df;
for (j = 0; j < DIRFILE_BUCKETS; ++j)
for (df = dir->files[j]; df != 0; df = df->next)
for (df = dir->contents->files[j]; df != 0; df = df->next)
if (df->impossible)
++im;
else
++f;
printf ("# %s: ", dir->name);
printf ("# %s (device %d, inode %d): ",
dir->name, dir->contents->dev, dir->contents->ino);
if (f == 0)
fputs ("No", stdout);
else
@ -382,7 +469,7 @@ print_dir_data_base ()
else
printf ("%u", im);
fputs (" impossibilities", stdout);
if (dir->dirstream == 0)
if (dir->contents->dirstream == 0)
puts (".");
else
puts (" so far.");