1 /* PSPP - computes sample statistics.
2 Copyright (C) 1997-2004 Free Software Foundation, Inc.
3 Written by Ben Pfaff <blp@gnu.org>.
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 #include <language/data-io/data-writer.h>
25 #include <libpspp/alloc.h>
26 #include <libpspp/message.h>
27 #include <language/data-io/file-handle.h>
28 #include <data/file-name.h>
29 #include <libpspp/str.h>
32 #define _(msgid) gettext (msgid)
34 /* Data file writer. */
37 struct file_handle *fh; /* File handle. */
38 FILE *file; /* Associated file. */
39 char *bounce; /* Bounce buffer for fixed-size fields. */
42 /* Opens a file handle for writing as a data file. */
44 dfm_open_writer (struct file_handle *fh)
49 aux = fh_open (fh, FH_REF_FILE, "data file", "ws");
55 w = *aux = xmalloc (sizeof *w);
57 w->file = fn_open (fh_get_file_name (w->fh), "wb");
62 msg (ME, _("An error occurred while opening \"%s\" for writing "
63 "as a data file: %s."),
64 fh_get_file_name (w->fh), strerror (errno));
75 /* Returns false if an I/O error occurred on WRITER, true otherwise. */
77 dfm_write_error (const struct dfm_writer *writer)
79 return ferror (writer->file);
82 /* Writes record REC having length LEN to the file corresponding to
83 HANDLE. REC is not null-terminated. Returns nonzero on success,
86 dfm_put_record (struct dfm_writer *w, const char *rec, size_t len)
90 if (dfm_write_error (w))
93 if (fh_get_mode (w->fh) == FH_MODE_BINARY
94 && len < fh_get_record_width (w->fh))
96 size_t rec_width = fh_get_record_width (w->fh);
97 if (w->bounce == NULL)
98 w->bounce = xmalloc (rec_width);
99 memcpy (w->bounce, rec, len);
100 memset (&w->bounce[len], 0, rec_width - len);
105 fwrite (rec, len, 1, w->file);
106 return !dfm_write_error (w);
109 /* Closes data file writer W. */
111 dfm_close_writer (struct dfm_writer *w)
118 file_name = xstrdup (fh_get_name (w->fh));
119 if (fh_close (w->fh, "data file", "ws"))
128 ok = !dfm_write_error (w) && !fn_close (file_name, w->file);
131 msg (ME, _("I/O error occurred writing data file \"%s\"."), file_name);