1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2005, 2006 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/>. */
17 #ifndef FILE_HANDLE_DEF_H
18 #define FILE_HANDLE_DEF_H
22 #include <libpspp/legacy-encoding.h>
24 /* What a file handle refers to.
25 (Ordinarily only a single value is allowed, but fh_open()
26 and fh_parse() take a mask.) */
29 FH_REF_FILE = 001, /* Ordinary file (the most common case). */
30 FH_REF_INLINE = 002, /* The inline file. */
31 FH_REF_SCRATCH = 004 /* Temporary dataset. */
37 FH_MODE_TEXT, /* New-line delimited lines. */
38 FH_MODE_FIXED, /* Fixed-length records. */
39 FH_MODE_VARIABLE, /* Binary variable-length records. */
40 FH_MODE_360_VARIABLE, /* IBM 360 variable-length records. */
41 FH_MODE_360_SPANNED, /* IBM 360 variable-length, spanned records. */
44 /* Ways to access a file. */
47 FH_ACC_READ, /* Read from it. */
48 FH_ACC_WRITE /* Write to it. */
51 /* Properties of a file handle. */
54 enum fh_mode mode; /* File mode. */
55 size_t record_width; /* Length of fixed-format records. */
56 size_t tab_width; /* Tab width, 0=do not expand tabs. */
57 enum legacy_encoding encoding;/* ASCII or EBCDIC? */
63 /* Creating file handles. */
64 struct file_handle *fh_create_file (const char *handle_name,
65 const char *file_name,
66 const struct fh_properties *);
67 struct file_handle *fh_create_scratch (const char *handle_name);
68 const struct fh_properties *fh_default_properties (void);
70 /* Reference management. */
71 struct file_handle *fh_ref (struct file_handle *);
72 void fh_unref (struct file_handle *);
73 void fh_unname (struct file_handle *);
75 /* Finding file handles. */
76 struct file_handle *fh_from_id (const char *handle_name);
77 struct file_handle *fh_from_file_name (const char *file_name);
78 struct file_handle *fh_inline_file (void);
80 /* Generic properties of file handles. */
81 const char *fh_get_id (const struct file_handle *);
82 const char *fh_get_name (const struct file_handle *);
83 enum fh_referent fh_get_referent (const struct file_handle *);
85 /* Properties of FH_REF_FILE file handles. */
86 const char *fh_get_file_name (const struct file_handle *);
87 enum fh_mode fh_get_mode (const struct file_handle *) ;
89 /* Properties of FH_REF_FILE and FH_REF_INLINE file handles. */
90 size_t fh_get_record_width (const struct file_handle *);
91 size_t fh_get_tab_width (const struct file_handle *);
92 enum legacy_encoding fh_get_legacy_encoding (const struct file_handle *);
94 /* Properties of FH_REF_SCRATCH file handles. */
95 struct scratch_handle *fh_get_scratch_handle (const struct file_handle *);
96 void fh_set_scratch_handle (struct file_handle *, struct scratch_handle *);
98 /* Mutual exclusion for access . */
99 struct fh_lock *fh_lock (struct file_handle *, enum fh_referent mask,
100 const char *type, enum fh_access, bool exclusive);
101 bool fh_unlock (struct fh_lock *);
102 void *fh_lock_get_aux (const struct fh_lock *);
103 void fh_lock_set_aux (struct fh_lock *, void *aux);
104 bool fh_is_locked (const struct file_handle *, enum fh_access);
106 /* Default file handle for DATA LIST, REREAD, REPEATING DATA
108 struct file_handle *fh_get_default_handle (void);
109 void fh_set_default_handle (struct file_handle *);