( Compatibility

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 Compatibility with standard `dbm' and `ndbm'.
    GNU `dbm' files are not `sparse'. You can copy them with the UNIX
 `cp' command and they will not expand in the copying process.
    There is a compatibility mode for use with programs that already use
 UNIX `dbm' and UNIX `ndbm'.
    GNU `dbm' has compatibility functions for `dbm'. For `dbm'
 compatibility functions, you need the include file `dbm.h'.
    In this compatibility mode, no `gdbm' file pointer is required by
 the user, and Only one file may be opened at a time. All users in
 compatibility mode are assumed to be writers. If the `gdbm' file is a
 read only, it will fail as a writer, but will also try to open it as a
 reader.  All returned pointers in datum structures point to data that
 `gdbm' WILL free. They should be treated as static pointers (as
 standard UNIX `dbm' does). The compatibility function names are the
 same as the UNIX `dbm' function names. Their definitions follow:
      int dbminit(name);
      int store(key, content);
      datum fetch(key);
      int delete(key);
      datum firstkey();
      datum nextkey(key);
      int dbmclose();
    Standard UNIX `dbm' and GNU `dbm' do not have the same data format
 in the file. You cannot access a standard UNIX `dbm' file with GNU
 `dbm'!  If you want to use an old database with GNU `dbm', you must use
 the `conv2gdbm' program.
    Also, GNU `dbm' has compatibility functions for `ndbm'. For `ndbm'
 compatibility functions, you need the include file `ndbm.h'.
    Again, just like `ndbm', any returned datum can be assumed to be
 static storage. You do not have to free that memory, the `ndbm'
 compatibility functions will do it for you.
    The functions are:
      DBM *dbm_open(name, flags, mode);
      void dbm_close(file);
      datum dbm_fetch(file, key);
      int dbm_store(file, key, `content', flags);
      int dbm_delete(file, key);
      datum dbm_firstkey(file);
      datum dbm_nextkey(file);
      int dbm_error(file);
      int dbm_clearerr(file);
      int dbm_dirfno(file);
      int dbm_pagfno(file);
      int dbm_rdonly(file);
    If you want to compile an old C program that used UNIX `dbm' or
 `ndbm' and want to use `gdbm' files, execute the following `cc' command:
      cc ... -L/usr/local/lib -lgdbm -lgdbm_compat
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