hovel.h

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/*************************************************************************************************
 * The GDBM-compatible API of QDBM
 *                                                      Copyright (C) 2000-2003 Mikio Hirabayashi
 * This file is part of QDBM, Quick Database Manager.
 * QDBM is free software; you can redistribute it and/or modify it under the terms of the GNU
 * Lesser General Public License as published by the Free Software Foundation; either version
 * 2.1 of the License or any later version.  QDBM 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 Lesser General Public License for more
 * details.
 * You should have received a copy of the GNU Lesser General Public License along with QDBM; if
 * not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307 USA.
 *************************************************************************************************/


#ifndef _HOVEL_H                         /* duplication check */
#define _HOVEL_H


#include <depot.h>
#include <curia.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>



/*************************************************************************************************
 * API
 *************************************************************************************************/


typedef enum {                           /* type of enumeration for error codes */
  GDBM_NO_ERROR,                         /* no error */
  GDBM_MALLOC_ERROR,                     /* malloc error */
  GDBM_BLOCK_SIZE_ERROR,                 /* block size error */
  GDBM_FILE_OPEN_ERROR,                  /* file open error */
  GDBM_FILE_WRITE_ERROR,                 /* file write error */
  GDBM_FILE_SEEK_ERROR,                  /* file seek error */
  GDBM_FILE_READ_ERROR,                  /* file read error */
  GDBM_BAD_MAGIC_NUMBER,                 /* bad magic number */
  GDBM_EMPTY_DATABASE,                   /* empty database */
  GDBM_CANT_BE_READER,                   /* can't be reader */
  GDBM_CANT_BE_WRITER,                   /* can't be writer */
  GDBM_READER_CANT_DELETE,               /* reader can't delete */
  GDBM_READER_CANT_STORE,                /* reader can't store */
  GDBM_READER_CANT_REORGANIZE,           /* reader can't reorganize */
  GDBM_UNKNOWN_UPDATE,                   /* unknown update */
  GDBM_ITEM_NOT_FOUND,                   /* item not found */
  GDBM_REORGANIZE_FAILED,                /* reorganize failed */
  GDBM_CANNOT_REPLACE,                   /* cannot replace */
  GDBM_ILLEGAL_DATA,                     /* illegal data */
  GDBM_OPT_ALREADY_SET,                  /* option already set */
  GDBM_OPT_ILLEGAL                       /* option illegal */
} gdbm_error;

typedef struct {                         /* type of structure for a database handle */
  DEPOT *depot;                          /* internal database handle of Depot */
  CURIA *curia;                          /* internal database handle of Curia */
  int syncmode;                          /* wheter syncronous mode or not */
} GDBM;

typedef GDBM *GDBM_FILE;                 /* type of pointer to a database handle */

typedef struct {                         /* type of structure for a key or a value */
  char *dptr;                            /* pointer to the region */
  size_t dsize;                          /* size of the region */
} datum;

enum {                                   /* enumeration for open modes */
  GDBM_READER = 1 << 0,                  /* open as a reader */
  GDBM_WRITER = 1 << 2,                  /* open as a writer */
  GDBM_WRCREAT = 1 << 3,                 /* a writer creating */
  GDBM_NEWDB = 1 << 4,                   /* a writer creating and truncating */
  GDBM_SYNC = 1 << 5,                    /* syncronous mode */
  GDBM_NOLOCK = 1 << 6,                  /* no lock mode */
  GDBM_FAST = 1 << 7                     /* fast mode */
};

enum {                                   /* enumeration for write modes */
  GDBM_INSERT,                           /* keep an existing value */
  GDBM_REPLACE                           /* overwrite an existing value */
};

enum {                                   /* enumeration for options */
  GDBM_CACHESIZE,                        /* set cache size */
  GDBM_FASTMODE,                         /* set fast mode */
  GDBM_SYNCMODE,                         /* set syncronous mode */
  GDBM_CENTFREE,                         /* set free block pool */
  GDBM_COALESCEBLKS                      /* set free block marging */
};


/* String containing the version information. */
extern char *gdbm_version;


/* Last happened error code. */
extern gdbm_error gdbm_errno;


/* Get a message string corresponding to an error code.
   `gdbmerrno' specifies an error code.
   The return value is the message string of the error code.  The region of the return value
   is not writable. */
char *gdbm_strerror(gdbm_error gdbmerrno);


/* Get a database handle after the fashion of GDBM.
   `name' specifies a name of a database.
   `read_write' specifies the connection mode: `GDBM_READER' as a reader, `GDBM_WRITER',
   `GDBM_WRCREAT' and `GDBM_NEWDB' as a writer.  `GDBM_WRCREAT' makes a database file or
   directory if it does not exist.  `GDBM_NEWDB' makes a new database even if it exists.
   You can add the following to writer modes by bitwise or: `GDBM_SYNC', `GDBM_NOLOCK', and
   `GDBM_FAST'.  `GDBM_SYNC' means a database is synchronized after every updating method.
   `GDBM_NOLOCK' means a database is opened without file locking.  `GDBM_FAST' is ignored.
   `mode' specifies a mode of a database file or a database directory as the one of `open'
   or `mkdir' call does.
   `bnum' specifies the number of elements of each bucket array.  If it is not more than 0,
   the default value is specified.
   `dnum' specifies the number of division of the database.  If it is not more than 0, the
   returning handle is created as a wrapper of Depot, else, it is as a wrapper of Curia.
   The return value is the database handle or `NULL' if it is not successful.
   If the database already exists, whether it is one of Depot or Curia is measured
   automatically. */
GDBM_FILE gdbm_open(char *name, int block_size, int read_write, int mode,
                    void (*fatal_func)(void));


/* Get a database handle after the fashion of QDBM.
   `name' specifies a name of a database.
   `read_write' specifies the connection mode: `GDBM_READER' as a reader, `GDBM_WRITER',
   `GDBM_WRCREAT' and `GDBM_NEWDB' as a writer.  `GDBM_WRCREAT' makes a database file or
   directory if it does not exist.  `GDBM_NEWDB' makes a new database even if it exists.
   You can add the following to writer modes by bitwise or: `GDBM_SYNC', `GDBM_NOLOCK', and
   `GDBM_FAST'.  `GDBM_SYNC' means a database is synchronized after every updating method.
   `GDBM_NOLOCK' means a database is opened without file locking.  `GDBM_FAST' is ignored.
   `mode' specifies a mode of a database file as the one of `open' or `mkdir' call does.
   `bnum' specifies the number of elements of each bucket array.  If it is not more than 0,
   the default value is specified.
   `dnum' specifies the number of division of the database.  If it is not more than 0, the
   returning handle is created as a wrapper of Depot, else, it is as a wrapper of Curia.
   `align' specifies the basic size of alignment.
   The return value is the database handle or `NULL' if it is not successful. */
GDBM_FILE gdbm_open2(char *name, int read_write, int mode, int bnum, int dnum, int align);


/* Close a database handle.
   `dbf' specifies a database handle.
   Because the region of the closed handle is released, it becomes impossible to use the
   handle. */
void gdbm_close(GDBM_FILE dbf);


/* Store a record.
   `dbf' specifies a database handle connected as a writer.
   `key' specifies a structure of a key.  `content' specifies a structure of a value.
   `flag' specifies behavior when the key overlaps, by the following values: `GDBM_REPLACE',
   which means the specified value overwrites the existing one, `GDBM_INSERT', which means
   the existing value is kept.
   The return value is 0 if it is successful, 1 if it gives up because of overlaps of the key,
   -1 if other error occurs. */
int gdbm_store(GDBM_FILE dbf, datum key, datum content, int flag);


/* Delete a record.
   `dbf' specifies a database handle connected as a writer.
   `key' specifies a structure of a key.
   The return value is 0 if it is successful, -1 if some errors occur. */
int gdbm_delete(GDBM_FILE dbf, datum key);


/* Retrieve a record.
   `dbf' specifies a database handle.
   `key' specifies a structure of a key.
   The return value is a structure of the result.
   If a record corresponds, the member `dptr' of the structure is the pointer to the region
   of the value.  If no record corresponds or some errors occur, `dptr' is `NULL'.  Because
   the region pointed to by `dptr' is allocated with the `malloc' call, it should be
   released with the `free' call if it is no longer in use. */
datum gdbm_fetch(GDBM_FILE dbf, datum key);


/* Check whether a record exists or not.
   `dbf' specifies a database handle.
   `key' specifies a structure of a key.
   The return value is true if a record corresponds and no error occurs, or false, else,
   it is false. */
int gdbm_exists(GDBM_FILE dbf, datum key);


/* Get the first key of a database.
   `dbf' specifies a database handle.
   The return value is a structure of the result.
   If a record corresponds, the member `dptr' of the structure is the pointer to the region
   of the first key.  If no record corresponds or some errors occur, `dptr' is `NULL'.
   Because the region pointed to by `dptr' is allocated with the `malloc' call, it should
   be released with the `free' call if it is no longer in use. */
datum gdbm_firstkey(GDBM_FILE dbf);


/* Get the next key of a database.
   `dbf' specifies a database handle.
   The return value is a structure of the result.
   If a record corresponds, the member `dptr' of the structure is the pointer to the region
   of the next key.  If no record corresponds or some errors occur, `dptr' is `NULL'.
   Because the region pointed to by `dptr' is allocated with the `malloc' call, it should
   be released with the `free' call if it is no longer in use. */
datum gdbm_nextkey(GDBM_FILE dbf, datum key);


/* Synchronize updating contents with the file and the device.
   `dbf' specifies a database handle connected as a writer. */
void gdbm_sync(GDBM_FILE dbf);


/* Reorganize a database.
   `dbf' specifies a database handle connected as a writer.
   If successful, the return value is 0, else -1. */
int gdbm_reorganize(GDBM_FILE dbf);


/* Get the file descriptor of a database file.
   `dbf' specifies a database handle connected as a writer.
   The return value is the file descriptor of the database file.
   If the database is a directory the return value is -1. */
int gdbm_fdesc(GDBM_FILE dbf);


/* No effect.
   `dbf' specifies a database handle.
   `option' is ignored.  `size' is ignored.
   The return value is 0.
   The function is only for compatibility. */
int gdbm_setopt(GDBM_FILE dbf, int option, int *value, int size);



#endif                                   /* duplication check */


/* END OF FILE */