1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 2006, 2010 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 #include "any-reader.h"
24 #include <libpspp/assertion.h>
25 #include <libpspp/message.h>
26 #include "file-handle-def.h"
27 #include "file-name.h"
28 #include "por-file-reader.h"
29 #include "sys-file-reader.h"
30 #include <libpspp/str.h>
31 #include "scratch-reader.h"
35 #define _(msgid) gettext (msgid)
37 /* Result of type detection. */
40 YES, /* It is this type. */
41 NO, /* It is not this type. */
42 IO_ERROR /* File couldn't be opened. */
45 /* Tries to detect whether FILE is a given type of file, by opening the file
46 and passing it to DETECT, and returns a detect_result. */
47 static enum detect_result
48 try_detect (const char *file_name, bool (*detect) (FILE *))
53 file = fn_open (file_name, "rb");
56 msg (ME, _("An error occurred while opening `%s': %s."),
57 file_name, strerror (errno));
61 is_type = detect (file);
63 fn_close (file_name, file);
65 return is_type ? YES : NO;
68 /* Returns true if any_reader_open() would be able to open FILE as a data
69 file, false otherwise. */
71 any_reader_may_open (const char *file)
73 return (try_detect (file, sfm_detect) == YES
74 || try_detect (file, pfm_detect) == YES);
77 /* Returns a casereader for HANDLE. On success, returns the new
78 casereader and stores the file's dictionary into *DICT. On
79 failure, returns a null pointer. */
81 any_reader_open (struct file_handle *handle, struct dictionary **dict)
83 switch (fh_get_referent (handle))
87 enum detect_result result;
89 result = try_detect (fh_get_file_name (handle), sfm_detect);
90 if (result == IO_ERROR)
92 else if (result == YES)
93 return sfm_open_reader (handle, dict, NULL);
95 result = try_detect (fh_get_file_name (handle), pfm_detect);
96 if (result == IO_ERROR)
98 else if (result == YES)
99 return pfm_open_reader (handle, dict, NULL);
101 msg (SE, _("`%s' is not a system or portable file."),
102 fh_get_file_name (handle));
107 msg (SE, _("The inline file is not allowed here."));
111 return scratch_reader_open (handle, dict);