Provided by: m17n-docs_1.8.4-1_all 
NAME
m17nDatabase_-_Data - - The m17n database and API for it.
SYNOPSIS
Typedefs
typedef struct MDatabase MDatabase
Type of database.
Functions
MDatabase * mdatabase_find (MSymbol tag0, MSymbol tag1, MSymbol tag2, MSymbol tag3)
Look for a data in the database.
MPlist * mdatabase_list (MSymbol tag0, MSymbol tag1, MSymbol tag2, MSymbol tag3)
Return a data list of the m17n database.
MDatabase * mdatabase_define (MSymbol tag0, MSymbol tag1, MSymbol tag2, MSymbol tag3, void
*(*loader)(MSymbol *, void *), void *extra_info)
Define a data of the m17n database.
void * mdatabase_load (MDatabase *mdb)
Load a data from the database.
MSymbol * mdatabase_tag (MDatabase *mdb)
Get tags of a data.
Variables
char * mdatabase_dir
Detailed Description
The m17n database and API for it.
Directory for application specific data.
The m17n library acquires various kinds of information from data in the m17n database on demand.
Application programs can also add/load their original data to/from the m17n database by setting the
variable mdatabase_dir to an application-specific directory and storing data in it. Users can overwrite
those data by storing preferable data in the directory specified by the environment variable 'M17NDIR',
or if it is not set, in the directory '~/.m17n.d'.
The m17n database contains multiple heterogeneous data, and each data is identified by four tags; TAG0,
TAG1, TAG2, TAG3. Each tag must be a symbol.
TAG0 specifies the type of data stored in the database as below.
• If TAG0 is Mchar_table, the data is of the chartable type and provides information about each
character. In this case, TAG1 specifies the type of the information and must be Msymbol, Minteger,
Mstring, Mtext, or Mplist. TAG2 and TAG3 can be any symbols.
• If TAG0 is Mcharset, the data is of the charset type and provides a decode/encode mapping table for a
charset. In this case, TAG1 must be a symbol representing a charset. TAG2 and TAG3 can be any symbols.
• If TAG0 is neither Mchar_table nor Mcharset, the data is of the plist type. See the documentation of
the mdatabase_load() function for the details.
In this case, TAG1, TAG2, and TAG3 can be any symbols.
The notation <TAG0, TAG1, TAG2, TAG3> means a data with those tags.
Application programs first calls the mdatabase_find() function to get a pointer to an object of the type
MDatabase. That object holds information about the specified data. When it is successfully returned, the
mdatabase_load() function loads the data. The implementation of the structure MDatabase is concealed from
application programs.
If an application program wants to provide a data specific to the program or a data overriding what
supplied by the m17n database, it must set this variable to a name of directory that contains the data
files before it calls the macro M17N_INIT(). The directory may contain a file 'mdb.dir' which contains a
list of data definitions in the format described in mdbDir(5).
The default value is NULL.
Typedef Documentation
typedef struct MDatabase MDatabase
Type of database. <>
The type MDatabase is for a database object. Its internal structure is concealed from an application
program.
Variable Documentation
char* mdatabase_dir
Author
Generated automatically by Doxygen for The m17n Library from the source code.
COPYRIGHT
Copyright (C) 2001 Information-technology Promotion Agency (IPA)
Copyright (C) 2001-2011 National Institute of Advanced Industrial Science and Technology (AIST)
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free
Documentation License <http://www.gnu.org/licenses/fdl.html>.
Version 1.8.4 Mon Sep 25 2023 m17nDatabase(3m17n)