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dir.c
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/* Directory hashing for GNU Make.
Copyright (C) 1988-2020 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 3 of the License, 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
this program. If not, see <http://www.gnu.org/licenses/>. */
#include "makeint.h"
#include "hash.h"
#include "filedef.h"
#include "dep.h"
#ifdef HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
# ifdef VMS
/* its prototype is in vmsdir.h, which is not needed for HAVE_DIRENT_H */
const char *vmsify (const char *name, int type);
# endif
#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
#ifdef _GUARDIAN_TARGET
# include <cextdecs.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 (VMS) || 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 const char *
dosify (const 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; i < 8 && ! STOP_SET (*filename, MAP_DOT|MAP_NUL); ++i)
*df++ = tolower ((unsigned char)*filename++);
/* Now skip to the next dot. */
while (! STOP_SET (*filename, MAP_DOT|MAP_NUL))
++filename;
if (*filename != '\0')
{
*df++ = *filename++;
for (i = 0; i < 3 && ! STOP_SET (*filename, MAP_DOT|MAP_NUL); ++i)
*df++ = tolower ((unsigned char)*filename++);
}
/* Look for more dots. */
while (! STOP_SET (*filename, MAP_DOT|MAP_NUL))
++filename;
if (*filename == '.')
return filename;
*df = 0;
return dos_filename;
}
#endif /* __MSDOS__ */
#ifdef WINDOWS32
#include "pathstuff.h"
#endif
#ifdef _AMIGA
#include <ctype.h>
#endif
#ifdef HAVE_CASE_INSENSITIVE_FS
static const char *
downcase (const char *filename)
{
static PATH_VAR (new_filename);
char *df;
if (filename == 0)
return 0;
df = new_filename;
while (*filename != '\0')
{
*df++ = tolower ((unsigned char)*filename);
++filename;
}
*df = 0;
return new_filename;
}
#endif /* HAVE_CASE_INSENSITIVE_FS */
#ifdef VMS
static char *
downcase_inplace(char *filename)
{
char *name;
name = filename;
while (*name != '\0')
{
*name = tolower ((unsigned char)*name);
++name;
}
return filename;
}
#ifndef _USE_STD_STAT
/* VMS 8.2 fixed the VMS stat output to have unique st_dev and st_ino
when _USE_STD_STAT is used on the compile line.
Prior to _USE_STD_STAT support, the st_dev is a pointer to thread
static memory containing the device of the last filename looked up.
Todo: find out if the ino_t still needs to be faked on a directory.
*/
/* Define this if the older VMS_INO_T is needed */
#define VMS_INO_T 1
static int
vms_hash (const char *name)
{
int h = 0;
while (*name)
{
unsigned char uc = (unsigned char) *name;
int g;
#ifdef HAVE_CASE_INSENSITIVE_FS
h = (h << 4) + (isupper (uc) ? tolower (uc) : uc);
#else
h = (h << 4) + uc;
#endif
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 (const 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)
{
/* to keep the compiler happy we said "const char *name", now we cheat */
*s++ = 0;
st->st_dev = (char *)vms_hash (name);
h = vms_hash (s);
*(s-1) = ':';
}
else
{
st->st_dev = 0;
h = vms_hash (name);
}
st->st_ino[0] = h & 0xff;
st->st_ino[1] = h & 0xff00;
st->st_ino[2] = h >> 16;
return 0;
}
# define stat(__path, __sbuf) vmsstat_dir (__path, __sbuf)
#endif /* _USE_STD_STAT */
#endif /* VMS */
/* Hash table of directories. */
#ifndef DIRECTORY_BUCKETS
#define DIRECTORY_BUCKETS 199
#endif
struct directory_contents
{
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;
time_t ctime;
time_t 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_t ino[3];
# else
ino_t ino;
# endif
#endif /* WINDOWS32 */
struct hash_table dirfiles; /* Files in this directory. */
DIR *dirstream; /* Stream reading this directory. */
};
static unsigned long
directory_contents_hash_1 (const void *key_0)
{
const struct directory_contents *key = key_0;
unsigned long hash;
#ifdef WINDOWS32
hash = 0;
ISTRING_HASH_1 (key->path_key, hash);
hash ^= ((unsigned int) key->dev << 4) ^ (unsigned int) key->ctime;
#else
# ifdef VMS_INO_T
hash = (((unsigned int) key->dev << 4)
^ ((unsigned int) key->ino[0]
+ (unsigned int) key->ino[1]
+ (unsigned int) key->ino[2]));
# else
hash = ((unsigned int) key->dev << 4) ^ (unsigned int) key->ino;
# endif
#endif /* WINDOWS32 */
return hash;
}
static unsigned long
directory_contents_hash_2 (const void *key_0)
{
const struct directory_contents *key = key_0;
unsigned long hash;
#ifdef WINDOWS32
hash = 0;
ISTRING_HASH_2 (key->path_key, hash);
hash ^= ((unsigned int) key->dev << 4) ^ (unsigned int) ~key->ctime;
#else
# ifdef VMS_INO_T
hash = (((unsigned int) key->dev << 4)
^ ~((unsigned int) key->ino[0]
+ (unsigned int) key->ino[1]
+ (unsigned int) key->ino[2]));
# else
hash = ((unsigned int) key->dev << 4) ^ (unsigned int) ~key->ino;
# endif
#endif /* WINDOWS32 */
return hash;
}
/* Sometimes it's OK to use subtraction to get this value:
result = X - Y;
But, if we're not sure of the type of X and Y they may be too large for an
int (on a 64-bit system for example). So, use ?: instead.
See Savannah bug #15534.
NOTE! This macro has side-effects!
*/
#define MAKECMP(_x,_y) ((_x)<(_y)?-1:((_x)==(_y)?0:1))
static int
directory_contents_hash_cmp (const void *xv, const void *yv)
{
const struct directory_contents *x = xv;
const struct directory_contents *y = yv;
int result;
#ifdef WINDOWS32
ISTRING_COMPARE (x->path_key, y->path_key, result);
if (result)
return result;
result = MAKECMP(x->ctime, y->ctime);
if (result)
return result;
#else
# ifdef VMS_INO_T
result = MAKECMP(x->ino[0], y->ino[0]);
if (result)
return result;
result = MAKECMP(x->ino[1], y->ino[1]);
if (result)
return result;
result = MAKECMP(x->ino[2], y->ino[2]);
if (result)
return result;
# else
result = MAKECMP(x->ino, y->ino);
if (result)
return result;
# endif
#endif /* WINDOWS32 */
return MAKECMP(x->dev, y->dev);
}
/* Table of directory contents hashed by device and inode number. */
static struct hash_table directory_contents;
struct directory
{
const 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;
};
static unsigned long
directory_hash_1 (const void *key)
{
return_ISTRING_HASH_1 (((const struct directory *) key)->name);
}
static unsigned long
directory_hash_2 (const void *key)
{
return_ISTRING_HASH_2 (((const struct directory *) key)->name);
}
static int
directory_hash_cmp (const void *x, const void *y)
{
return_ISTRING_COMPARE (((const struct directory *) x)->name,
((const struct directory *) y)->name);
}
/* Table of directories hashed by name. */
static struct hash_table directories;
/* 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
{
const char *name; /* Name of the file. */
size_t length;
short impossible; /* This file is impossible. */
unsigned char type;
};
static unsigned long
dirfile_hash_1 (const void *key)
{
return_ISTRING_HASH_1 (((struct dirfile const *) key)->name);
}
static unsigned long
dirfile_hash_2 (const void *key)
{
return_ISTRING_HASH_2 (((struct dirfile const *) key)->name);
}
static int
dirfile_hash_cmp (const void *xv, const void *yv)
{
const struct dirfile *x = xv;
const struct dirfile *y = yv;
int result = (int) (x->length - y->length);
if (result)
return result;
return_ISTRING_COMPARE (x->name, y->name);
}
#ifndef DIRFILE_BUCKETS
#define DIRFILE_BUCKETS 107
#endif
static int dir_contents_file_exists_p (struct directory_contents *dir,
const char *filename);
static struct directory *find_directory (const char *name);
/* Find the directory named NAME and return its 'struct directory'. */
static struct directory *
find_directory (const char *name)
{
struct directory *dir;
struct directory **dir_slot;
struct directory dir_key;
dir_key.name = name;
dir_slot = (struct directory **) hash_find_slot (&directories, &dir_key);
dir = *dir_slot;
if (HASH_VACANT (dir))
{
/* The directory was not found. Create a new entry for it. */
const char *p = name + strlen (name);
struct stat st;
int r;
dir = xmalloc (sizeof (struct directory));
#if defined(HAVE_CASE_INSENSITIVE_FS) && defined(VMS)
/* Todo: Why is this only needed on VMS? */
{
char *lname = downcase_inplace (xstrdup (name));
dir->name = strcache_add_len (lname, p - name);
free (lname);
}
#else
dir->name = strcache_add_len (name, p - name);
#endif
hash_insert_at (&directories, dir, dir_slot);
/* The directory is not in the name hash table.
Find its device and inode numbers, and look it up by them. */
#if defined(WINDOWS32)
{
char tem[MAXPATHLEN], *tstart, *tend;
/* Remove any trailing slashes. Windows32 stat fails even on
valid directories if they end in a slash. */
memcpy (tem, name, p - name + 1);
tstart = tem;
if (tstart[1] == ':')
tstart += 2;
for (tend = tem + (p - name - 1);
tend > tstart && (*tend == '/' || *tend == '\\');
tend--)
*tend = '\0';
r = stat (tem, &st);
}
#else
EINTRLOOP (r, stat (name, &st));
#endif
if (r < 0)
{
/* 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. */
#ifdef WINDOWS32
char *w32_path;
#endif
struct directory_contents *dc;
struct directory_contents **dc_slot;
struct directory_contents dc_key;
dc_key.dev = st.st_dev;
#ifdef WINDOWS32
dc_key.path_key = w32_path = w32ify (name, 1);
dc_key.ctime = st.st_ctime;
#else
# ifdef VMS_INO_T
dc_key.ino[0] = st.st_ino[0];
dc_key.ino[1] = st.st_ino[1];
dc_key.ino[2] = st.st_ino[2];
# else
dc_key.ino = st.st_ino;
# endif
#endif
dc_slot = (struct directory_contents **) hash_find_slot (&directory_contents, &dc_key);
dc = *dc_slot;
if (HASH_VACANT (dc))
{
/* Nope; this really is a directory we haven't seen before. */
#ifdef WINDOWS32
char fs_label[BUFSIZ];
char fs_type[BUFSIZ];
unsigned long fs_serno;
unsigned long fs_flags;
unsigned long fs_len;
#endif
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 = xstrdup (w32_path);
dc->ctime = st.st_ctime;
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_INO_T
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 */
hash_insert_at (&directory_contents, dc, dc_slot);
ENULLLOOP (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->dirfiles.ht_vec = 0;
else
{
hash_init (&dc->dirfiles, DIRFILE_BUCKETS,
dirfile_hash_1, dirfile_hash_2, dirfile_hash_cmp);
/* 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. */
dir_contents_file_exists_p (dc, 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 (struct directory_contents *dir,
const char *filename)
{
struct dirfile *df;
struct dirent *d;
#ifdef WINDOWS32
struct stat st;
int rehash = 0;
#endif
if (dir == 0 || dir->dirfiles.ht_vec == 0)
/* The directory could not be stat'd or opened. */
return 0;
#ifdef __MSDOS__
filename = dosify (filename);
#endif
#ifdef HAVE_CASE_INSENSITIVE_FS
filename = downcase (filename);
#endif
#ifdef __EMX__
if (filename != 0)
_fnlwr (filename); /* lower case for FAT drives */
#endif
if (filename != 0)
{
struct dirfile dirfile_key;
if (*filename == '\0')
{
/* Checking if the directory exists. */
return 1;
}
dirfile_key.name = filename;
dirfile_key.length = strlen (filename);
df = hash_find_item (&dir->dirfiles, &dirfile_key);
if (df)
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)
{
if ((dir->fs_flags & FS_FAT) != 0)
{
dir->mtime = time ((time_t *) 0);
rehash = 1;
}
else if (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;
rehash = 1;
}
/* If it has been already read in, all done. */
if (!rehash)
return 0;
/* make sure directory can still be opened; if not return. */
dir->dirstream = opendir (dir->path_key);
if (!dir->dirstream)
return 0;
}
else
#endif
/* The directory has been all read in. */
return 0;
}
while (1)
{
/* Enter the file in the hash table. */
size_t len;
struct dirfile dirfile_key;
struct dirfile **dirfile_slot;
ENULLLOOP (d, readdir (dir->dirstream));
if (d == 0)
{
if (errno)
pfatal_with_name ("INTERNAL: readdir");
break;
}
#if defined(VMS) && defined(HAVE_DIRENT_H)
/* In VMS we get file versions too, which have to be stripped off.
Some versions of VMS return versions on Unix files even when
the feature option to strip them is set. */
{
char *p = strrchr (d->d_name, ';');
if (p)
*p = '\0';
}
#endif
if (!REAL_DIR_ENTRY (d))
continue;
len = NAMLEN (d);
dirfile_key.name = d->d_name;
dirfile_key.length = len;
dirfile_slot = (struct dirfile **) hash_find_slot (&dir->dirfiles, &dirfile_key);
#ifdef WINDOWS32
/*
* If re-reading a directory, don't cache files that have
* already been discovered.
*/
if (! rehash || HASH_VACANT (*dirfile_slot))
#endif
{
df = xmalloc (sizeof (struct dirfile));
#if defined(HAVE_CASE_INSENSITIVE_FS) && defined(VMS)
/* TODO: Why is this only needed on VMS? */
df->name = strcache_add_len (downcase_inplace (d->d_name), len);
#else
df->name = strcache_add_len (d->d_name, len);
#endif
#ifdef HAVE_STRUCT_DIRENT_D_TYPE
df->type = d->d_type;
#endif
df->length = len;
df->impossible = 0;
hash_insert_at (&dir->dirfiles, df, dirfile_slot);
}
/* Check if the name matches the one we're searching for. */
if (filename != 0 && patheq (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 (const char *dirname, const char *filename)
{
#ifdef VMS
if ((filename != NULL) && (dirname != NULL))
{
int want_vmsify;
want_vmsify = (strpbrk (dirname, ":<[") != NULL);
if (want_vmsify)
filename = vmsify (filename, 0);
}
#endif
return dir_contents_file_exists_p (find_directory (dirname)->contents,
filename);
}
/* Return 1 if the file named NAME exists. */
int
file_exists_p (const char *name)
{
const char *dirend;
const char *dirname;
const char *slash;
#ifndef NO_ARCHIVES
if (ar_name (name))
return ar_member_date (name) != (time_t) -1;
#endif
#ifdef _GUARDIAN_TARGET
short error = FILE_GETINFOBYNAME_(name, (short) strlen(name));
if (error == 0)
return 1;
if (error != 13)
return 0;
// Fall through to standard POSIX parsing.
#endif
dirend = strrchr (name, '/');
#ifdef VMS
if (dirend == 0)
{
dirend = strrchr (name, ']');
dirend == NULL ? dirend : dirend++;
}
if (dirend == 0)
{
dirend = strrchr (name, '>');
dirend == NULL ? dirend : dirend++;
}
if (dirend == 0)
{
dirend = strrchr (name, ':');
dirend == NULL ? dirend : dirend++;
}
#endif /* VMS */
#ifdef HAVE_DOS_PATHS
/* Forward and backslashes might be mixed. We need the rightmost one. */
{
const char *bslash = strrchr (name, '\\');
if (!dirend || bslash > dirend)
dirend = bslash;
/* The case of "d:file". */
if (!dirend && name[0] && name[1] == ':')
dirend = name + 1;
}
#endif /* HAVE_DOS_PATHS */
if (dirend == 0)
#ifndef _AMIGA
return dir_file_exists_p (".", name);
#else /* !AMIGA */
return dir_file_exists_p ("", name);
#endif /* AMIGA */
slash = dirend;
if (dirend == name)
dirname = "/";
else
{
char *p;
#ifdef HAVE_DOS_PATHS
/* d:/ and d: are *very* different... */
if (dirend < name + 3 && name[1] == ':' &&
(*dirend == '/' || *dirend == '\\' || *dirend == ':'))
dirend++;
#endif
p = alloca (dirend - name + 1);
memcpy (p, name, dirend - name);
p[dirend - name] = '\0';
dirname = p;
}
#ifdef VMS
if (*slash == '/')
slash++;
#else
slash++;
#endif
return dir_file_exists_p (dirname, slash);
}
/* 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 (const char *filename)
{
const char *dirend;
const char *p = filename;
struct directory *dir;
struct dirfile *new;
dirend = strrchr (p, '/');
#ifdef VMS
if (dirend == NULL)
{
dirend = strrchr (p, ']');
dirend == NULL ? dirend : dirend++;
}
if (dirend == NULL)
{
dirend = strrchr (p, '>');
dirend == NULL ? dirend : dirend++;
}
if (dirend == NULL)
{
dirend = strrchr (p, ':');
dirend == NULL ? dirend : dirend++;
}
#endif
#ifdef HAVE_DOS_PATHS
/* Forward and backslashes might be mixed. We need the rightmost one. */
{
const char *bslash = strrchr (p, '\\');
if (!dirend || bslash > dirend)
dirend = bslash;
/* The case of "d:file". */
if (!dirend && p[0] && p[1] == ':')
dirend = p + 1;
}
#endif /* HAVE_DOS_PATHS */
if (dirend == 0)
#ifdef _AMIGA
dir = find_directory ("");
#else /* !AMIGA */
dir = find_directory (".");
#endif /* AMIGA */
else
{
const char *dirname;
const char *slash = dirend;
if (dirend == p)
dirname = "/";
else
{
char *cp;
#ifdef HAVE_DOS_PATHS
/* d:/ and d: are *very* different... */
if (dirend < p + 3 && p[1] == ':' &&
(*dirend == '/' || *dirend == '\\' || *dirend == ':'))
dirend++;
#endif
cp = alloca (dirend - p + 1);
memcpy (cp, p, dirend - p);
cp[dirend - p] = '\0';
dirname = cp;
}
dir = find_directory (dirname);
#ifdef VMS
if (*slash == '/')
filename = p = slash + 1;
else
filename = p = slash;
#else
filename = p = slash + 1;
#endif
}
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 = xcalloc (sizeof (struct directory_contents));
if (dir->contents->dirfiles.ht_vec == 0)
{
hash_init (&dir->contents->dirfiles, DIRFILE_BUCKETS,
dirfile_hash_1, dirfile_hash_2, dirfile_hash_cmp);
}
/* Make a new entry and put it in the table. */
new = xmalloc (sizeof (struct dirfile));
new->length = strlen (filename);
#if defined(HAVE_CASE_INSENSITIVE_FS) && defined(VMS)
/* todo: Why is this only needed on VMS? */
new->name = strcache_add_len (downcase (filename), new->length);
#else
new->name = strcache_add_len (filename, new->length);
#endif
new->impossible = 1;
hash_insert (&dir->contents->dirfiles, new);
}
/* Return nonzero if FILENAME has been marked impossible. */
int
file_impossible_p (const char *filename)
{
const char *dirend;
struct directory_contents *dir;
struct dirfile *dirfile;
struct dirfile dirfile_key;
#ifdef VMS
int want_vmsify = 0;
#endif
dirend = strrchr (filename, '/');
#ifdef VMS
if (dirend == NULL)
{
want_vmsify = (strpbrk (filename, "]>:^") != NULL);
dirend = strrchr (filename, ']');
}
if (dirend == NULL && want_vmsify)
dirend = strrchr (filename, '>');
if (dirend == NULL && want_vmsify)
dirend = strrchr (filename, ':');
#endif
#ifdef HAVE_DOS_PATHS
/* Forward and backslashes might be mixed. We need the rightmost one. */
{
const char *bslash = strrchr (filename, '\\');
if (!dirend || bslash > dirend)
dirend = bslash;
/* The case of "d:file". */