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make/dir.c
Paul Smith be3fb0ae6d Updates for GNU make 3.75.92.
1997-08-27 20:30:54 +00:00

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/* Directory hashing for GNU Make.
Copyright (C) 1988,89,91,92,93,94,95,96,97 Free Software Foundation, Inc.
This file is part of GNU Make.
GNU Make is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Make is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Make; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "make.h"
#ifdef HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# ifdef HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
# include <ndir.h>
# endif
# ifdef HAVE_VMSDIR_H
# include "vmsdir.h"
# endif /* HAVE_VMSDIR_H */
#endif
/* In GNU systems, <dirent.h> defines this macro for us. */
#ifdef _D_NAMLEN
#undef NAMLEN
#define NAMLEN(d) _D_NAMLEN(d)
#endif
#if (defined (POSIX) || defined (WINDOWS32)) && !defined (__GNU_LIBRARY__)
/* Posix does not require that the d_ino field be present, and some
systems do not provide it. */
#define REAL_DIR_ENTRY(dp) 1
#define FAKE_DIR_ENTRY(dp)
#else
#define REAL_DIR_ENTRY(dp) (dp->d_ino != 0)
#define FAKE_DIR_ENTRY(dp) (dp->d_ino = 1)
#endif /* POSIX */
#ifdef __MSDOS__
#include <ctype.h>
#include <fcntl.h>
/* If it's MSDOS that doesn't have _USE_LFN, disable LFN support. */
#ifndef _USE_LFN
#define _USE_LFN 0
#endif
static char *
dosify (filename)
char *filename;
{
static char dos_filename[14];
char *df;
int i;
if (filename == 0 || _USE_LFN)
return filename;
/* FIXME: what about filenames which violate
8+3 constraints, like "config.h.in", or ".emacs"? */
if (strpbrk (filename, "\"*+,;<=>?[\\]|") != 0)
return filename;
df = dos_filename;
/* First, transform the name part. */
for (i = 0; *filename != '\0' && i < 8 && *filename != '.'; ++i)
*df++ = tolower (*filename++);
/* Now skip to the next dot. */
while (*filename != '\0' && *filename != '.')
++filename;
if (*filename != '\0')
{
*df++ = *filename++;
for (i = 0; *filename != '\0' && i < 3 && *filename != '.'; ++i)
*df++ = tolower (*filename++);
}
/* Look for more dots. */
while (*filename != '\0' && *filename != '.')
++filename;
if (*filename == '.')
return filename;
*df = 0;
return dos_filename;
}
#endif /* __MSDOS__ */
#ifdef WINDOWS32
#include "pathstuff.h"
#endif
#ifdef _AMIGA
#include <ctype.h>
static char *
amigafy (filename)
char *filename;
{
static char amiga_filename[136];
char *df;
int i;
if (filename == 0)
return 0;
df = amiga_filename;
/* First, transform the name part. */
for (i = 0; *filename != '\0'; ++i)
{
*df++ = tolower (*filename);
++filename;
}
*df = 0;
return amiga_filename;
}
#endif /* _AMIGA */
#ifdef VMS
static int
vms_hash (name)
char *name;
{
int h = 0;
int g;
while (*name)
{
h = (h << 4) + *name++;
g = h & 0xf0000000;
if (g)
{
h = h ^ (g >> 24);
h = h ^ g;
}
}
return h;
}
/* fake stat entry for a directory */
static int
vmsstat_dir (name, st)
char *name;
struct stat *st;
{
char *s;
int h;
DIR *dir;
dir = opendir (name);
if (dir == 0)
return -1;
closedir (dir);
s = strchr (name, ':'); /* find device */
if (s)
{
*s++ = 0;
st->st_dev = (char *)vms_hash (name);
h = vms_hash (s);
*(s-1) = ':';
}
else
{
st->st_dev = 0;
s = name;
h = vms_hash (s);
}
st->st_ino[0] = h & 0xff;
st->st_ino[1] = h & 0xff00;
st->st_ino[2] = h >> 16;
return 0;
}
#endif /* VMS */
/* Hash table of directories. */
#ifndef DIRECTORY_BUCKETS
#define DIRECTORY_BUCKETS 199
#endif
struct directory_contents
{
struct directory_contents *next;
dev_t dev; /* Device and inode numbers of this dir. */
#ifdef WINDOWS32
/*
* Inode means nothing on WINDOWS32. Even file key information is
* unreliable because it is random per file open and undefined
* for remote filesystems. The most unique attribute I can
* come up with is the fully qualified name of the directory. Beware
* though, this is also unreliable. I'm open to suggestion on a better
* way to emulate inode.
*/
char *path_key;
int mtime; /* controls check for stale directory cache */
int fs_flags; /* FS_FAT, FS_NTFS, ... */
#define FS_FAT 0x1
#define FS_NTFS 0x2
#define FS_UNKNOWN 0x4
#else
#ifdef VMS
ino_t ino[3];
#else
ino_t ino;
#endif
#endif /* WINDOWS32 */
struct dirfile **files; /* Files in this directory. */
DIR *dirstream; /* Stream reading this directory. */
};
/* 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];
/* Never have more than this many directories open at once. */
#define MAX_OPEN_DIRECTORIES 10
static unsigned int open_directories = 0;
/* Hash table of files in each directory. */
struct dirfile
{
struct dirfile *next;
char *name; /* Name of the file. */
char impossible; /* This file is impossible. */
};
#ifndef DIRFILE_BUCKETS
#define DIRFILE_BUCKETS 107
#endif
static int dir_contents_file_exists_p PARAMS ((struct directory_contents *dir, char *filename));
static struct directory *find_directory PARAMS ((char *name));
/* Find the directory named NAME and return its `struct directory'. */
static struct directory *
find_directory (name)
register char *name;
{
register unsigned int hash = 0;
register char *p;
register struct directory *dir;
#ifdef WINDOWS32
char* w32_path;
char fs_label[BUFSIZ];
char fs_type[BUFSIZ];
long fs_serno;
long fs_flags;
long fs_len;
#endif
#ifdef VMS
if ((*name == '.') && (*(name+1) == 0))
name = "[]";
else
name = vmsify (name,1);
#endif
for (p = name; *p != '\0'; ++p)
HASHI (hash, *p);
hash %= DIRECTORY_BUCKETS;
for (dir = directories[hash]; dir != 0; dir = dir->next)
if (strieq (dir->name, name))
break;
if (dir == 0)
{
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);
/* The directory is not in the name hash table.
Find its device and inode numbers, and look it up by them. */
#ifdef VMS
if (vmsstat_dir (name, &st) < 0)
#else
if (stat (name, &st) < 0)
#endif
{
/* Couldn't stat the directory. Mark this by
setting the `contents' member to a nil pointer. */
dir->contents = 0;
}
else
{
/* Search the contents hash table; device and inode are the key. */
struct directory_contents *dc;
#ifdef WINDOWS32
w32_path = w32ify(name, 1);
hash = ((unsigned int) st.st_dev << 16) | (unsigned int) st.st_ctime;
#else
#ifdef VMS
hash = ((unsigned int) st.st_dev << 16)
| ((unsigned int) st.st_ino[0]
+ (unsigned int) st.st_ino[1]
+ (unsigned int) st.st_ino[2]);
#else
hash = ((unsigned int) st.st_dev << 16) | (unsigned int) st.st_ino;
#endif
#endif
hash %= DIRECTORY_BUCKETS;
for (dc = directories_contents[hash]; dc != 0; dc = dc->next)
#ifdef WINDOWS32
if (!strcmp(dc->path_key, w32_path))
#else
if (dc->dev == st.st_dev
#ifdef VMS
&& dc->ino[0] == st.st_ino[0]
&& dc->ino[1] == st.st_ino[1]
&& dc->ino[2] == st.st_ino[2])
#else
&& dc->ino == st.st_ino)
#endif
#endif /* WINDOWS32 */
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;
#ifdef WINDOWS32
dc->path_key = strdup(w32_path);
dc->mtime = st.st_mtime;
/*
* NTFS is the only WINDOWS32 filesystem that bumps mtime
* on a directory when files are added/deleted from
* a directory.
*/
w32_path[3] = '\0';
if (GetVolumeInformation(w32_path,
fs_label, sizeof (fs_label),
&fs_serno, &fs_len,
&fs_flags, fs_type, sizeof (fs_type)) == FALSE)
dc->fs_flags = FS_UNKNOWN;
else if (!strcmp(fs_type, "FAT"))
dc->fs_flags = FS_FAT;
else if (!strcmp(fs_type, "NTFS"))
dc->fs_flags = FS_NTFS;
else
dc->fs_flags = FS_UNKNOWN;
#else
#ifdef VMS
dc->ino[0] = st.st_ino[0];
dc->ino[1] = st.st_ino[1];
dc->ino[2] = st.st_ino[2];
#else
dc->ino = st.st_ino;
#endif
#endif /* WINDOWS32 */
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 is entered in DIR's hash table.
FILENAME must contain no slashes. */
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 dirfile *df;
register struct dirent *d;
#ifdef WINDOWS32
struct stat st;
int rehash = 0;
#endif
if (dir == 0 || dir->files == 0)
{
/* The directory could not be stat'd or opened. */
return 0;
}
#ifdef __MSDOS__
filename = dosify (filename);
#endif
#ifdef _AMIGA
filename = amigafy (filename);
#endif
#ifdef VMS
filename = vmsify (filename,0);
#endif
hash = 0;
if (filename != 0)
{
if (*filename == '\0')
{
/* Checking if the directory exists. */
return 1;
}
for (p = filename; *p != '\0'; ++p)
HASH (hash, *p);
hash %= DIRFILE_BUCKETS;
/* Search the list of hashed files. */
for (df = dir->files[hash]; df != 0; df = df->next)
{
if (strieq (df->name, filename))
{
return !df->impossible;
}
}
}
/* The file was not found in the hashed list.
Try to read the directory further. */
if (dir->dirstream == 0)
{
#ifdef WINDOWS32
/*
* Check to see if directory has changed since last read. FAT
* filesystems force a rehash always as mtime does not change
* on directories (ugh!).
*/
if (dir->path_key &&
(dir->fs_flags & FS_FAT ||
(stat(dir->path_key, &st) == 0 &&
st.st_mtime > dir->mtime))) {
/* reset date stamp to show most recent re-process */
dir->mtime = st.st_mtime;
/* make sure directory can still be opened */
dir->dirstream = opendir(dir->path_key);
if (dir->dirstream)
rehash = 1;
else
return 0; /* couldn't re-read - fail */
} else
#endif
/* The directory has been all read in. */
return 0;
}
while ((d = readdir (dir->dirstream)) != 0)
{
/* Enter the file in the hash table. */
register unsigned int newhash = 0;
unsigned int len;
register unsigned int i;
if (!REAL_DIR_ENTRY (d))
continue;
len = NAMLEN (d);
for (i = 0; i < len; ++i)
HASHI (newhash, d->d_name[i]);
newhash %= DIRFILE_BUCKETS;
#ifdef WINDOWS32
/*
* If re-reading a directory, check that this file isn't already
* in the cache.
*/
if (rehash) {
for (df = dir->files[newhash]; df != 0; df = df->next)
if (streq(df->name, d->d_name))
break;
} else
df = 0;
/*
* If re-reading a directory, don't cache files that have
* already been discovered.
*/
if (!df) {
#endif
df = (struct dirfile *) xmalloc (sizeof (struct dirfile));
df->next = dir->files[newhash];
dir->files[newhash] = df;
df->name = savestring (d->d_name, len);
df->impossible = 0;
#ifdef WINDOWS32
}
#endif
/* Check if the name matches the one we're searching for. */
if (filename != 0
&& newhash == hash && strieq (d->d_name, filename))
{
return 1;
}
}
/* If the directory has been completely read in,
close the stream and reset the pointer to nil. */
if (d == 0)
{
--open_directories;
closedir (dir->dirstream);
dir->dirstream = 0;
}
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. */
int
file_exists_p (name)
register char *name;
{
char *dirend;
char *dirname;
#ifndef NO_ARCHIVES
if (ar_name (name))
return ar_member_date (name) != (time_t) -1;
#endif
#ifdef VMS
dirend = rindex (name, ']');
dirend++;
if (dirend == (char *)1)
return dir_file_exists_p ("[]", name);
#else /* !VMS */
dirend = rindex (name, '/');
#if defined (WINDOWS32) || defined (__MSDOS__)
/* Forward and backslashes might be mixed. We need the rightmost one. */
{
char *bslash = rindex(name, '\\');
if (!dirend || bslash > dirend)
dirend = bslash;
/* The case of "d:file" is unhandled. But I don't think
such names can happen here. */
}
#endif /* WINDOWS32 || __MSDOS__ */
if (dirend == 0)
#ifndef _AMIGA
return dir_file_exists_p (".", name);
#else /* !VMS && !AMIGA */
return dir_file_exists_p ("", name);
#endif /* AMIGA */
#endif /* VMS */
if (dirend == name)
dirname = "/";
else
{
dirname = (char *) alloca (dirend - name + 1);
bcopy (name, dirname, dirend - name);
dirname[dirend - name] = '\0';
}
return dir_file_exists_p (dirname, dirend + 1);
}
/* Mark FILENAME as `impossible' for `file_impossible_p'.
This means an attempt has been made to search for FILENAME
as an intermediate file, and it has failed. */
void
file_impossible (filename)
register char *filename;
{
char *dirend;
register char *p = filename;
register unsigned int hash;
register struct directory *dir;
register struct dirfile *new;
#ifdef VMS
dirend = rindex (p, ']');
dirend++;
if (dirend == (char *)1)
dir = find_directory ("[]");
#else
dirend = rindex (p, '/');
#if defined (WINDOWS32) || defined (__MSDOS__)
/* Forward and backslashes might be mixed. We need the rightmost one. */
{
char *bslash = rindex(p, '\\');
if (!dirend || bslash > dirend)
dirend = bslash;
/* The case of "d:file" is unhandled. But I don't think
such names can happen here. */
}
#endif /* WINDOWS32 or __MSDOS__ */
if (dirend == 0)
#ifdef _AMIGA
dir = find_directory ("");
#else /* !VMS && !AMIGA */
dir = find_directory (".");
#endif /* AMIGA */
#endif /* VMS */
else
{
char *dirname;
if (dirend == p)
dirname = "/";
else
{
dirname = (char *) alloca (dirend - p + 1);
bcopy (p, dirname, dirend - p);
dirname[dirend - p] = '\0';
}
dir = find_directory (dirname);
filename = p = dirend + 1;
}
for (hash = 0; *p != '\0'; ++p)
HASHI (hash, *p);
hash %= DIRFILE_BUCKETS;
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));
#ifdef WINDOWS32
dir->contents->path_key = NULL;
dir->contents->mtime = 0;
#else /* WINDOWS32 */
#ifdef VMS
dir->contents->dev = 0;
dir->contents->ino[0] = dir->contents->ino[1] =
dir->contents->ino[2] = 0;
#else
dir->contents->dev = dir->contents->ino = 0;
#endif
#endif /* WINDOWS32 */
dir->contents->files = 0;
dir->contents->dirstream = 0;
}
if (dir->contents->files == 0)
{
/* The directory was not opened; we must allocate the hash buckets. */
dir->contents->files = (struct dirfile **)
xmalloc (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->contents->files[hash];
dir->contents->files[hash] = new;
new->name = savestring (filename, strlen (filename));
new->impossible = 1;
}
/* Return nonzero if FILENAME has been marked impossible. */
int
file_impossible_p (filename)
char *filename;
{
char *dirend;
register char *p = filename;
register unsigned int hash;
register struct directory_contents *dir;
register struct dirfile *next;
#ifdef VMS
dirend = rindex (filename, ']');
if (dirend == 0)
dir = find_directory ("[]")->contents;
#else
dirend = rindex (filename, '/');
#if defined (WINDOWS32) || defined (__MSDOS__)
/* Forward and backslashes might be mixed. We need the rightmost one. */
{
char *bslash = rindex(filename, '\\');
if (!dirend || bslash > dirend)
dirend = bslash;
/* The case of "d:file" is unhandled. But I don't think
such names can happen here. */
}
#endif /* WINDOWS32 || __MSDOS__ */
if (dirend == 0)
#ifdef _AMIGA
dir = find_directory ("")->contents;
#else /* !VMS && !AMIGA */
dir = find_directory (".")->contents;
#endif /* AMIGA */
#endif /* VMS */
else
{
char *dirname;
if (dirend == filename)
dirname = "/";
else
{
dirname = (char *) alloca (dirend - filename + 1);
bcopy (p, dirname, dirend - p);
dirname[dirend - p] = '\0';
}
dir = find_directory (dirname)->contents;
p = filename = dirend + 1;
}
if (dir == 0 || dir->files == 0)
/* There are no files entered for this directory. */
return 0;
#ifdef __MSDOS__
p = filename = dosify (p);
#endif
#ifdef _AMIGA
p = filename = amigafy (p);
#endif
#ifdef VMS
p = filename = vmsify (p, 1);
#endif
for (hash = 0; *p != '\0'; ++p)
HASH (hash, *p);
hash %= DIRFILE_BUCKETS;
for (next = dir->files[hash]; next != 0; next = next->next)
if (strieq (filename, next->name))
return next->impossible;
return 0;
}
/* Return the already allocated name in the
directory hash table that matches DIR. */
char *
dir_name (dir)
char *dir;
{
return find_directory (dir)->name;
}
/* Print the data base of directories. */
void
print_dir_data_base ()
{
register unsigned int i, dirs, files, impossible;
register struct directory *dir;
puts ("\n# Directories\n");
dirs = files = impossible = 0;
for (i = 0; i < DIRECTORY_BUCKETS; ++i)
for (dir = directories[i]; dir != 0; dir = dir->next)
{
++dirs;
if (dir->contents == 0)
printf ("# %s: could not be stat'd.\n", dir->name);
else if (dir->contents->files == 0)
#ifdef WINDOWS32
printf ("# %s (key %s, mtime %d): could not be opened.\n",
dir->name, dir->contents->path_key,dir->contents->mtime);
#else /* WINDOWS32 */
#ifdef VMS
printf ("# %s (device %d, inode [%d,%d,%d]): could not be opened.\n",
dir->name, dir->contents->dev,
dir->contents->ino[0], dir->contents->ino[1],
dir->contents->ino[2]);
#else
printf ("# %s (device %ld, inode %ld): could not be opened.\n",
dir->name, (long int) dir->contents->dev,
(long int) dir->contents->ino);
#endif
#endif /* WINDOWS32 */
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->contents->files[j]; df != 0; df = df->next)
if (df->impossible)
++im;
else
++f;
#ifdef WINDOWS32
printf ("# %s (key %s, mtime %d): ",
dir->name, dir->contents->path_key, dir->contents->mtime);
#else /* WINDOWS32 */
#ifdef VMS
printf ("# %s (device %d, inode [%d,%d,%d]): ",
dir->name, dir->contents->dev,
dir->contents->ino[0], dir->contents->ino[1],
dir->contents->ino[2]);
#else
printf ("# %s (device %d, inode %d): ",
dir->name, dir->contents->dev, dir->contents->ino);
#endif
#endif /* WINDOWS32 */
if (f == 0)
fputs ("No", stdout);
else
printf ("%u", f);
fputs (" files, ", stdout);
if (im == 0)
fputs ("no", stdout);
else
printf ("%u", im);
fputs (" impossibilities", stdout);
if (dir->contents->dirstream == 0)
puts (".");
else
puts (" so far.");
files += f;
impossible += im;
}
}
fputs ("\n# ", stdout);
if (files == 0)
fputs ("No", stdout);
else
printf ("%u", files);
fputs (" files, ", stdout);
if (impossible == 0)
fputs ("no", stdout);
else
printf ("%u", impossible);
printf (" impossibilities in %u directories.\n", dirs);
}
/* Hooks for globbing. */
#include <glob.h>
/* Structure describing state of iterating through a directory hash table. */
struct dirstream
{
struct directory_contents *contents; /* The directory being read. */
unsigned int bucket; /* Current hash bucket. */
struct dirfile *elt; /* Current elt in bucket. */
};
/* Forward declarations. */
static __ptr_t open_dirstream PARAMS ((const char *));
static struct dirent *read_dirstream PARAMS ((__ptr_t));
static __ptr_t
open_dirstream (directory)
const char *directory;
{
struct dirstream *new;
struct directory *dir = find_directory ((char *)directory);
if (dir->contents == 0 || dir->contents->files == 0)
/* DIR->contents is nil if the directory could not be stat'd.
DIR->contents->files is nil if it could not be opened. */
return 0;
/* Read all the contents of the directory now. There is no benefit
in being lazy, since glob will want to see every file anyway. */
(void) dir_contents_file_exists_p (dir->contents, (char *) 0);
new = (struct dirstream *) xmalloc (sizeof (struct dirstream));
new->contents = dir->contents;
new->bucket = 0;
new->elt = new->contents->files[0];
return (__ptr_t) new;
}
static struct dirent *
read_dirstream (stream)
__ptr_t stream;
{
struct dirstream *const ds = (struct dirstream *) stream;
register struct dirfile *df;
static char *buf;
static unsigned int bufsz;
while (ds->bucket < DIRFILE_BUCKETS)
{
while ((df = ds->elt) != 0)
{
ds->elt = df->next;
if (!df->impossible)
{
/* The glob interface wants a `struct dirent',
so mock one up. */
struct dirent *d;
unsigned int len = strlen (df->name) + 1;
if (sizeof *d - sizeof d->d_name + len > bufsz)
{
if (buf != 0)
free (buf);
bufsz *= 2;
if (sizeof *d - sizeof d->d_name + len > bufsz)
bufsz = sizeof *d - sizeof d->d_name + len;
buf = xmalloc (bufsz);
}
d = (struct dirent *) buf;
FAKE_DIR_ENTRY (d);
#ifdef _DIRENT_HAVE_D_NAMLEN
d->d_namlen = len - 1;
#endif
memcpy (d->d_name, df->name, len);
return d;
}
}
if (++ds->bucket == DIRFILE_BUCKETS)
break;
ds->elt = ds->contents->files[ds->bucket];
}
return 0;
}
void
dir_setup_glob (gl)
glob_t *gl;
{
extern int stat ();
/* Bogus sunos4 compiler complains (!) about & before functions. */
gl->gl_opendir = open_dirstream;
gl->gl_readdir = read_dirstream;
gl->gl_closedir = free;
gl->gl_stat = stat;
/* We don't bother setting gl_lstat, since glob never calls it.
The slot is only there for compatibility with 4.4 BSD. */
}
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