-/* PSPP - computes sample statistics.
- Copyright (C) 1997-2004 Free Software Foundation, Inc.
- Written by Ben Pfaff <blp@gnu.org>.
+/* PSPP - a program for statistical analysis.
+ Copyright (C) 1997-2004, 2006 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 the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ 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
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- This program 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.
+ This program 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, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
+
#include <language/data-io/data-writer.h>
+
#include <assert.h>
#include <errno.h>
+#include <stdint.h>
#include <stdlib.h>
-#include <libpspp/alloc.h>
-#include <libpspp/message.h>
+#include <sys/stat.h>
+
+#include <data/file-name.h>
+#include <data/make-file.h>
#include <language/data-io/file-handle.h>
-#include <data/filename.h>
+#include <libpspp/assertion.h>
+#include <libpspp/integer-format.h>
+#include <libpspp/message.h>
#include <libpspp/str.h>
+#include "minmax.h"
+#include "xalloc.h"
+
#include "gettext.h"
#define _(msgid) gettext (msgid)
+#define N_(msgid) (msgid)
/* Data file writer. */
struct dfm_writer
{
struct file_handle *fh; /* File handle. */
- struct file_ext file; /* Associated file. */
- char *bounce; /* Bounce buffer for fixed-size fields. */
+ struct fh_lock *lock; /* Exclusive access to file. */
+ FILE *file; /* Associated file. */
+ struct replace_file *rf; /* Atomic file replacement support. */
};
/* Opens a file handle for writing as a data file. */
dfm_open_writer (struct file_handle *fh)
{
struct dfm_writer *w;
- void **aux;
-
- aux = fh_open (fh, FH_REF_FILE, "data file", "ws");
- if (aux == NULL)
+ struct fh_lock *lock;
+
+ lock = fh_lock (fh, FH_REF_FILE, N_("data file"), FH_ACC_WRITE, false);
+ if (lock == NULL)
return NULL;
- if (*aux != NULL)
- return *aux;
-
- w = *aux = xmalloc (sizeof *w);
- w->fh = fh;
- w->file.file = NULL;
- w->bounce = NULL;
-
- w->file.filename = xstrdup (fh_get_filename (w->fh));
- w->file.mode = "wb";
- w->file.file = NULL;
- w->file.sequence_no = NULL;
- w->file.param = NULL;
- w->file.postopen = NULL;
- w->file.preclose = NULL;
-
- if (!fn_open_ext (&w->file))
+
+ w = fh_lock_get_aux (lock);
+ if (w != NULL)
+ return w;
+
+ w = xmalloc (sizeof *w);
+ w->fh = fh_ref (fh);
+ w->lock = lock;
+ w->rf = replace_file_start (fh_get_file_name (w->fh), "wb",
+ (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP
+ | S_IROTH | S_IWOTH), &w->file, NULL);
+ if (w->rf == NULL)
{
msg (ME, _("An error occurred while opening \"%s\" for writing "
"as a data file: %s."),
- fh_get_filename (w->fh), strerror (errno));
- goto error;
+ fh_get_file_name (w->fh), strerror (errno));
+ dfm_close_writer (w);
+ return NULL;
}
+ fh_lock_set_aux (lock, w);
return w;
-
- error:
- dfm_close_writer (w);
- return NULL;
}
/* Returns false if an I/O error occurred on WRITER, true otherwise. */
bool
-dfm_write_error (const struct dfm_writer *writer)
+dfm_write_error (const struct dfm_writer *writer)
{
- return ferror (writer->file.file);
+ return ferror (writer->file);
}
-/* Writes record REC having length LEN to the file corresponding to
- HANDLE. REC is not null-terminated. Returns nonzero on success,
- zero on failure. */
-int
+/* Writes record REC (which need not be null-terminated) having
+ length LEN to the file corresponding to HANDLE. Adds any
+ needed formatting, such as a trailing new-line. Returns true
+ on success, false on failure. */
+bool
dfm_put_record (struct dfm_writer *w, const char *rec, size_t len)
{
assert (w != NULL);
if (dfm_write_error (w))
- return 0;
-
- if (fh_get_mode (w->fh) == FH_MODE_BINARY
- && len < fh_get_record_width (w->fh))
+ return false;
+
+ switch (fh_get_mode (w->fh))
{
- size_t rec_width = fh_get_record_width (w->fh);
- if (w->bounce == NULL)
- w->bounce = xmalloc (rec_width);
- memcpy (w->bounce, rec, len);
- memset (&w->bounce[len], 0, rec_width - len);
- rec = w->bounce;
- len = rec_width;
+ case FH_MODE_TEXT:
+ fwrite (rec, len, 1, w->file);
+ putc ('\n', w->file);
+ break;
+
+ case FH_MODE_FIXED:
+ {
+ size_t record_width = fh_get_record_width (w->fh);
+ size_t write_bytes = MIN (len, record_width);
+ size_t pad_bytes = record_width - write_bytes;
+ fwrite (rec, write_bytes, 1, w->file);
+ while (pad_bytes > 0)
+ {
+ static const char spaces[32] = " ";
+ size_t chunk = MIN (pad_bytes, sizeof spaces);
+ fwrite (spaces, chunk, 1, w->file);
+ pad_bytes -= chunk;
+ }
+ }
+ break;
+
+ case FH_MODE_VARIABLE:
+ {
+ uint32_t size = len;
+ integer_convert (INTEGER_NATIVE, &size, INTEGER_LSB_FIRST, &size,
+ sizeof size);
+ fwrite (&size, sizeof size, 1, w->file);
+ fwrite (rec, len, 1, w->file);
+ fwrite (&size, sizeof size, 1, w->file);
+ }
+ break;
+
+ case FH_MODE_360_VARIABLE:
+ case FH_MODE_360_SPANNED:
+ {
+ size_t ofs = 0;
+ if (fh_get_mode (w->fh) == FH_MODE_360_VARIABLE)
+ len = MIN (65527, len);
+ while (ofs < len)
+ {
+ size_t chunk = MIN (65527, len - ofs);
+ uint32_t bdw = (chunk + 8) << 16;
+ int scc = (ofs == 0 && chunk == len ? 0
+ : ofs == 0 ? 1
+ : ofs + chunk == len ? 2
+ : 3);
+ uint32_t rdw = ((chunk + 4) << 16) | (scc << 8);
+
+ integer_convert (INTEGER_NATIVE, &bdw, INTEGER_MSB_FIRST, &bdw,
+ sizeof bdw);
+ integer_convert (INTEGER_NATIVE, &rdw, INTEGER_MSB_FIRST, &rdw,
+ sizeof rdw);
+ fwrite (&bdw, 1, sizeof bdw, w->file);
+ fwrite (&rdw, 1, sizeof rdw, w->file);
+ fwrite (rec + ofs, 1, chunk, w->file);
+ ofs += chunk;
+ }
+ }
+ break;
+
+ default:
+ NOT_REACHED ();
}
- fwrite (rec, len, 1, w->file.file);
return !dfm_write_error (w);
}
if (w == NULL)
return true;
- if (fh_close (w->fh, "data file", "ws"))
+ if (fh_unlock (w->lock))
return true;
ok = true;
- if (w->file.file != NULL)
+ if (w->file != NULL)
{
- ok = !dfm_write_error (w);
- if (!fn_close_ext (&w->file))
- ok = false;
+ const char *file_name = fh_get_file_name (w->fh);
+ ok = !dfm_write_error (w) && !fn_close (file_name, w->file);
if (!ok)
- msg (ME, _("I/O error occurred writing data file \"%s\"."),
- fh_get_filename (w->fh));
+ msg (ME, _("I/O error occurred writing data file \"%s\"."), file_name);
- free (w->file.filename);
- w->file.filename = NULL;
+ if (ok ? !replace_file_commit (w->rf) : !replace_file_abort (w->rf))
+ ok = false;
}
- free (w->bounce);
+ fh_unref (w->fh);
free (w);
return ok;
}
+
+/* Returns the legacy character encoding of data written to WRITER. */
+const char *
+dfm_writer_get_legacy_encoding (const struct dfm_writer *writer)
+{
+ return fh_get_legacy_encoding (writer->fh);
+}
projects / pspp-builds.git / blobdiff