/* PSPP - a program for statistical analysis.
- Copyright (C) 1997-9, 2000, 2006, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+ Copyright (C) 1997-9, 2000, 2006, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include <string.h>
#include "data/dataset.h"
-#include "data/file-name.h"
#include "data/variable.h"
+#include "libpspp/assertion.h"
#include "libpspp/cast.h"
#include "libpspp/compiler.h"
#include "libpspp/hash-functions.h"
#include "libpspp/message.h"
#include "libpspp/str.h"
+#include <sys/stat.h>
+
+#include "gl/dirname.h"
#include "gl/xalloc.h"
#include "gettext.h"
#define _(msgid) gettext (msgid)
+#if defined _WIN32 || defined __WIN32__
+#define WIN32_LEAN_AND_MEAN /* avoid including junk */
+#include <windows.h>
+#endif
+
/* File handle. */
struct file_handle
{
/* FH_REF_FILE only. */
char *file_name; /* File name as provided by user. */
+ char *file_name_encoding; /* The character encoding of file_name,
+ This is NOT the encoding of the file contents! */
enum fh_mode mode; /* File mode. */
+ enum fh_line_ends line_ends; /* Line ends for text files. */
/* FH_REF_FILE and FH_REF_INLINE only. */
size_t record_width; /* Length of fixed-format records. */
/* Hash table of all active locks. */
static struct hmap locks = HMAP_INITIALIZER (locks);
+static struct file_identity *fh_get_identity (const struct file_handle *);
+static void fh_free_identity (struct file_identity *);
+static int fh_compare_file_identities (const struct file_identity *,
+ const struct file_identity *);
+static unsigned int fh_hash_identity (const struct file_identity *);
+
/* File handle initialization routine. */
void
fh_init (void)
HMAP_FOR_EACH_SAFE (handle, next,
struct file_handle, name_node, &named_handles)
unname_handle (handle);
+
+ free_handle (inline_file);
}
/* Free HANDLE and remove it from the global list. */
static void
free_handle (struct file_handle *handle)
{
+ if (handle == NULL)
+ return;
+
/* Remove handle from global list. */
if (handle->id != NULL)
hmap_delete (&named_handles, &handle->name_node);
free (handle->id);
free (handle->name);
free (handle->file_name);
+ free (handle->file_name_encoding);
free (handle->encoding);
free (handle);
}
struct file_handle *
fh_ref (struct file_handle *handle)
{
+ if (handle == fh_inline_file ())
+ return handle;
assert (handle->ref_cnt > 0);
handle->ref_cnt++;
return handle;
{
if (handle != NULL)
{
+ if (handle == fh_inline_file ())
+ return;
assert (handle->ref_cnt > 0);
if (--handle->ref_cnt == 0)
free_handle (handle);
create_handle (const char *id, char *handle_name, enum fh_referent referent,
const char *encoding)
{
- struct file_handle *handle = xzalloc (sizeof *handle);
+ struct file_handle *handle = XZALLOC (struct file_handle);
handle->ref_cnt = 1;
- handle->id = id != NULL ? xstrdup (id) : NULL;
+ handle->id = xstrdup_if_nonnull (id);
handle->name = handle_name;
handle->referent = referent;
handle->encoding = xstrdup (encoding);
existing file identifiers. The new handle is associated with file FILE_NAME
and the given PROPERTIES. */
struct file_handle *
-fh_create_file (const char *id, const char *file_name,
+fh_create_file (const char *id, const char *file_name, const char *file_name_encoding,
const struct fh_properties *properties)
{
char *handle_name;
handle_name = id != NULL ? xstrdup (id) : xasprintf ("`%s'", file_name);
handle = create_handle (id, handle_name, FH_REF_FILE, properties->encoding);
handle->file_name = xstrdup (file_name);
+ handle->file_name_encoding = xstrdup_if_nonnull (file_name_encoding);
handle->mode = properties->mode;
+ handle->line_ends = properties->line_ends;
handle->record_width = properties->record_width;
handle->tab_width = properties->tab_width;
return handle;
const struct fh_properties *
fh_default_properties (void)
{
+#if defined _WIN32 || defined __WIN32__
+#define DEFAULT_LINE_ENDS FH_END_CRLF
+#else
+#define DEFAULT_LINE_ENDS FH_END_LF
+#endif
+
static const struct fh_properties default_properties
- = {FH_MODE_TEXT, 1024, 4, (char *) "Auto"};
+ = {FH_MODE_TEXT, DEFAULT_LINE_ENDS, 1024, 4, (char *) "Auto"};
return &default_properties;
}
return handle->file_name;
}
+
+/* Returns the character encoding of the name of the file associated with HANDLE. */
+const char *
+fh_get_file_name_encoding (const struct file_handle *handle)
+{
+ assert (handle->referent == FH_REF_FILE);
+ return handle->file_name_encoding;
+}
+
+
/* Returns the mode of HANDLE. */
enum fh_mode
fh_get_mode (const struct file_handle *handle)
return handle->mode;
}
+/* Returns the line ends of HANDLE, which must be a handle associated with a
+ file. */
+enum fh_line_ends
+fh_get_line_ends (const struct file_handle *handle)
+{
+ assert (handle->referent == FH_REF_FILE);
+ return handle->line_ends;
+}
+
/* Returns the width of a logical record on HANDLE. */
size_t
fh_get_record_width (const struct file_handle *handle)
return handle->encoding;
}
+/* Returns true if A and B refer to the same file or dataset, false
+ otherwise. */
+bool
+fh_equal (const struct file_handle *a, const struct file_handle *b)
+{
+ if (a->referent != b->referent)
+ return false;
+
+ switch (a->referent)
+ {
+ case FH_REF_FILE:
+ {
+ struct file_identity *a_id = fh_get_identity (a);
+ struct file_identity *b_id = fh_get_identity (b);
+
+ int cmp = fh_compare_file_identities (a_id, b_id);
+
+ fh_free_identity (a_id);
+ fh_free_identity (b_id);
+
+ return cmp == 0;
+ }
+
+ case FH_REF_INLINE:
+ return true;
+
+ case FH_REF_DATASET:
+ return a->ds == b->ds;
+
+ default:
+ NOT_REACHED ();
+ }
+}
+
/* Returns the dataset handle associated with HANDLE.
Applicable to only FH_REF_DATASET files. */
struct dataset *
fh_unref (default_handle);
default_handle = new_default_handle;
if (default_handle != NULL)
- fh_ref (default_handle);
+ default_handle = fh_ref (default_handle);
}
\f
/* Information about a file handle's readers or writers. */
HMAP_FOR_EACH_WITH_HASH (lock, struct fh_lock, node, hash, &locks)
{
- if ( 0 == compare_fh_locks (lock, key))
+ if (0 == compare_fh_locks (lock, key))
{
found_lock = true;
break;
}
}
- if ( found_lock )
+ if (found_lock)
{
if (strcmp (lock->type, type))
{
return NULL;
}
lock->open_cnt++;
-
+
free_key (key);
free (key);
found_lock = false;
HMAP_FOR_EACH_WITH_HASH (lock, struct fh_lock, node, hash, &locks)
{
- if ( 0 == compare_fh_locks (lock, key))
+ if (0 == compare_fh_locks (lock, key))
{
found_lock = true;
break;
HMAP_FOR_EACH_WITH_HASH (k, struct fh_lock, node, hash, &locks)
{
- if ( 0 == compare_fh_locks (k, &key))
+ if (0 == compare_fh_locks (k, &key))
{
is_locked = true;
break;
lock->referent = fh_get_referent (h);
lock->access = access;
if (lock->referent == FH_REF_FILE)
- lock->u.file = fn_get_identity (fh_get_file_name (h));
+ lock->u.file = fh_get_identity (h);
else if (lock->referent == FH_REF_DATASET)
lock->u.unique_id = dataset_seqno (fh_get_dataset (h));
}
free_key (struct fh_lock *lock)
{
if (lock->referent == FH_REF_FILE)
- fn_free_identity (lock->u.file);
+ fh_free_identity (lock->u.file);
}
/* Compares the key fields in struct fh_lock objects A and B and
else if (a->access != b->access)
return a->access < b->access ? -1 : 1;
else if (a->referent == FH_REF_FILE)
- return fn_compare_file_identities (a->u.file, b->u.file);
+ return fh_compare_file_identities (a->u.file, b->u.file);
else if (a->referent == FH_REF_DATASET)
return (a->u.unique_id < b->u.unique_id ? -1
: a->u.unique_id > b->u.unique_id);
{
unsigned int basis;
if (lock->referent == FH_REF_FILE)
- basis = fn_hash_identity (lock->u.file);
+ basis = fh_hash_identity (lock->u.file);
else if (lock->referent == FH_REF_DATASET)
basis = lock->u.unique_id;
else
basis = 0;
return hash_int ((lock->referent << 3) | lock->access, basis);
}
+
+\f
+
+
+
+
+/* A file's identity:
+
+ - For a file that exists, this is its device and inode.
+
+ - For a file that does not exist, but which has a directory
+ name that exists, this is the device and inode of the
+ directory, plus the file's base name.
+
+ - For a file that does not exist and has a nonexistent
+ directory, this is the file name.
+
+ Windows doesn't have inode numbers, so we just use the name
+ there. */
+struct file_identity
+{
+ unsigned long long device; /* Device number. */
+ unsigned long long inode; /* Inode number. */
+ char *name; /* File name, where needed, otherwise NULL. */
+};
+
+/* Returns a pointer to a dynamically allocated structure whose
+ value can be used to tell whether two files are actually the
+ same file. The caller is responsible for freeing the structure with
+ fh_free_identity() when finished. */
+static struct file_identity *
+fh_get_identity (const struct file_handle *fh)
+{
+ struct file_identity *identity = xmalloc (sizeof *identity);
+
+ const char *file_name = fh_get_file_name (fh);
+
+#if !(defined _WIN32 || defined __WIN32__)
+ struct stat s;
+ if (lstat (file_name, &s) == 0)
+ {
+ identity->device = s.st_dev;
+ identity->inode = s.st_ino;
+ identity->name = NULL;
+ }
+ else
+ {
+ char *dir = dir_name (file_name);
+ if (last_component (file_name) != NULL && stat (dir, &s) == 0)
+ {
+ identity->device = s.st_dev;
+ identity->inode = s.st_ino;
+ identity->name = base_name (file_name);
+ }
+ else
+ {
+ identity->device = 0;
+ identity->inode = 0;
+ identity->name = xstrdup (file_name);
+ }
+ free (dir);
+ }
+#else /* Windows */
+ bool ok = false;
+ HANDLE h = CreateFile (file_name, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_READONLY, NULL);
+ if (h != INVALID_HANDLE_VALUE)
+ {
+ BY_HANDLE_FILE_INFORMATION fi;
+ ok = GetFileInformationByHandle (h, &fi);
+ if (ok)
+ {
+ identity->device = fi.dwVolumeSerialNumber;
+ identity->inode = fi.nFileIndexHigh;
+ identity->inode <<= (sizeof fi.nFileIndexLow) * CHAR_BIT;
+ identity->inode |= fi.nFileIndexLow;
+ identity->name = 0;
+ }
+ CloseHandle (h);
+ }
+
+ if (!ok)
+ {
+ identity->device = 0;
+ identity->inode = 0;
+
+ size_t bufsize;
+ size_t pathlen = 255;
+ char *cname = NULL;
+ do
+ {
+ bufsize = pathlen;
+ cname = xrealloc (cname, bufsize);
+ pathlen = GetFullPathName (file_name, bufsize, cname, NULL);
+ }
+ while (pathlen > bufsize);
+ identity->name = xstrdup (cname);
+ free (cname);
+ str_lowercase (identity->name);
+ }
+#endif /* Windows */
+
+ return identity;
+}
+
+/* Frees IDENTITY obtained from fh_get_identity(). */
+void
+fh_free_identity (struct file_identity *identity)
+{
+ if (identity != NULL)
+ {
+ free (identity->name);
+ free (identity);
+ }
+}
+
+/* Compares A and B, returning a strcmp()-type result. */
+int
+fh_compare_file_identities (const struct file_identity *a,
+ const struct file_identity *b)
+{
+ if (a->device != b->device)
+ return a->device < b->device ? -1 : 1;
+ else if (a->inode != b->inode)
+ return a->inode < b->inode ? -1 : 1;
+ else if (a->name != NULL)
+ return b->name != NULL ? strcmp (a->name, b->name) : 1;
+ else
+ return b->name != NULL ? -1 : 0;
+}
+
+/* Returns a hash value for IDENTITY. */
+unsigned int
+fh_hash_identity (const struct file_identity *identity)
+{
+ unsigned int hash = hash_int (identity->device, identity->inode);
+ if (identity->name != NULL)
+ hash = hash_string (identity->name, hash);
+ return hash;
+}
projects / pspp / blobdiff