[PATCH] Port ndbm

Vaibhav Gupta vaibhavgupta40 at gmail.com
Fri Jun 7 02:01:45 UTC 2019


Please review the code so that I can send it to newlib-devel.

On Fri, Jun 7, 2019 at 7:22 AM Vaibhav Gupta <vaibhavgupta40 at gmail.com>
wrote:

> ---
>  newlib/libc/include/ndbm.h    |  86 ++++++++++++++
>  newlib/libc/posix/Makefile.am |   4 +-
>  newlib/libc/posix/ndbm.c      | 214 ++++++++++++++++++++++++++++++++++
>  3 files changed, 302 insertions(+), 2 deletions(-)
>  create mode 100644 newlib/libc/include/ndbm.h
>  create mode 100644 newlib/libc/posix/ndbm.c
>
> diff --git a/newlib/libc/include/ndbm.h b/newlib/libc/include/ndbm.h
> new file mode 100644
> index 000000000..1fd5e5198
> --- /dev/null
> +++ b/newlib/libc/include/ndbm.h
> @@ -0,0 +1,86 @@
> +/*-
> + * SPDX-License-Identifier: BSD-3-Clause
> + *
> + * Copyright (c) 1990, 1993
> + *     The Regents of the University of California.  All rights reserved.
> + *
> + * This code is derived from software contributed to Berkeley by
> + * Margo Seltzer.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + * 1. Redistributions of source code must retain the above copyright
> + *    notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + *    notice, this list of conditions and the following disclaimer in the
> + *    documentation and/or other materials provided with the distribution.
> + * 3. Neither the name of the University nor the names of its contributors
> + *    may be used to endorse or promote products derived from this
> software
> + *    without specific prior written permission.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
> + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
> PURPOSE
> + * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
> LIABLE
> + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> CONSEQUENTIAL
> + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
> + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
> + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
> STRICT
> + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
> WAY
> + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
> + * SUCH DAMAGE.
> + *
> + *     @(#)ndbm.h      8.1 (Berkeley) 6/2/93
> + * $FreeBSD$
> + */
> +
> +#ifndef _NDBM_H_
> +#define        _NDBM_H_
> +
> +#ifndef __DBINTERFACE_PRIVATE
> +#define __DBINTERFACE_PRIVATE
> +#endif
>
Included the above lines in ndbm.h, since     __hash_open     was under
conditional compilation in db_local.h . Line 211 (
https://github.com/VARoDeK/newlib/blob/master/newlib/libc/search/db_local.h
).

> +
> +#include <db_local.h>
> +
> +/* Map dbm interface onto db(3). */
> +#define DBM_RDONLY     O_RDONLY
> +
> +/* Flags to dbm_store(). */
> +#define DBM_INSERT      0
> +#define DBM_REPLACE     1
> +
> +/*
> + * The db(3) support for ndbm always appends this suffix to the
> + * file name to avoid overwriting the user's original database.
> + */
> +#define        DBM_SUFFIX      ".db"
> +
> +typedef struct {
> +       void *dptr;
> +       int dsize;      /* XXX Should be size_t according to 1003.1-2008.
> */
> +} datum;
> +
> +typedef DB DBM;
> +#define        dbm_pagfno(a)   DBM_PAGFNO_NOT_AVAILABLE
> +
> +__BEGIN_DECLS
> +int     dbm_clearerr(DBM *);
> +void    dbm_close(DBM *);
> +int     dbm_delete(DBM *, datum);
> +int     dbm_error(DBM *);
> +datum   dbm_fetch(DBM *, datum);
> +datum   dbm_firstkey(DBM *);
> +#if __BSD_VISIBLE
> +long    dbm_forder(DBM *, datum);
> +#endif
> +datum   dbm_nextkey(DBM *);
> +DBM    *dbm_open(const char *, int, mode_t);
> +int     dbm_store(DBM *, datum, datum, int);
> +#if __BSD_VISIBLE
> +int     dbm_dirfno(DBM *);
> +#endif
> +__END_DECLS
> +
> +#endif /* !_NDBM_H_ */
> diff --git a/newlib/libc/posix/Makefile.am b/newlib/libc/posix/Makefile.am
> index 6cdee1df0..01334c7fa 100644
> --- a/newlib/libc/posix/Makefile.am
> +++ b/newlib/libc/posix/Makefile.am
> @@ -2,12 +2,12 @@
>
>  AUTOMAKE_OPTIONS = cygnus
>
> -INCLUDES = $(NEWLIB_CFLAGS) $(CROSS_CFLAGS) $(TARGET_CFLAGS)
> +INCLUDES = -I$(srcdir)/../search $(NEWLIB_CFLAGS) $(CROSS_CFLAGS)
> $(TARGET_CFLAGS)
>
>  GENERAL_SOURCES = \
>         closedir.c collate.c collcmp.c creat.c dirfd.c \
>         fnmatch.c glob.c _isatty.c isatty.c \
> -       opendir.c readdir.c readdir_r.c \
> +       ndbm.c opendir.c readdir.c readdir_r.c \
>         regcomp.c regerror.c regexec.c regfree.c \
>         rewinddir.c sleep.c usleep.c \
>         telldir.c
> diff --git a/newlib/libc/posix/ndbm.c b/newlib/libc/posix/ndbm.c
> new file mode 100644
> index 000000000..63e54df37
> --- /dev/null
> +++ b/newlib/libc/posix/ndbm.c
> @@ -0,0 +1,214 @@
> +/*-
> + * SPDX-License-Identifier: BSD-3-Clause
> + *
> + * Copyright (c) 1990, 1993
> + *     The Regents of the University of California.  All rights reserved.
> + *
> + * This code is derived from software contributed to Berkeley by
> + * Margo Seltzer.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + * 1. Redistributions of source code must retain the above copyright
> + *    notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + *    notice, this list of conditions and the following disclaimer in the
> + *    documentation and/or other materials provided with the distribution.
> + * 3. Neither the name of the University nor the names of its contributors
> + *    may be used to endorse or promote products derived from this
> software
> + *    without specific prior written permission.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
> + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
> PURPOSE
> + * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
> LIABLE
> + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> CONSEQUENTIAL
> + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
> + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
> + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
> STRICT
> + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
> WAY
> + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
> + * SUCH DAMAGE.
> + */
> +
> +#if defined(LIBC_SCCS) && !defined(lint)
> +static char sccsid[] = "@(#)ndbm.c     8.4 (Berkeley) 7/21/94";
> +#endif /* LIBC_SCCS and not lint */
> +#include <sys/cdefs.h>
> +__FBSDID("$FreeBSD$");
> +
> +/*
> + * This package provides a dbm compatible interface to the new hashing
> + * package described in db(3).
> + */
> +
> +#include <sys/param.h>
> +
> +#include <stdio.h>
> +#include <string.h>
> +#include <errno.h>
> +
> +#include <ndbm.h>
> +#include <hash.h>
> +
> +/*
> + * Returns:
> + *     *DBM on success
> + *      NULL on failure
> + */
> +extern DBM *
> +dbm_open(const char *file, int flags, mode_t mode)
> +{
> +       HASHINFO info;
> +       char path[MAXPATHLEN];
> +
> +       info.bsize = 4096;
> +       info.ffactor = 40;
> +       info.nelem = 1;
> +       info.cachesize = 0;
> +       info.hash = NULL;
> +       info.lorder = 0;
> +
> +       if( strlen(file) >= sizeof(path) - strlen(DBM_SUFFIX)) {
> +               errno = ENAMETOOLONG;
> +               return(NULL);
> +       }
> +       (void)strcpy(path, file);
> +       (void)strcat(path, DBM_SUFFIX);
> +       return ((DBM *)__hash_open(path, flags, mode, 0, &info));
>
In ndbm.c,
The original code was:  *return ((DBM *)__hash_open(path, flags, mode,
&info, 0));*
But the declaration of this function in db_local.h is: *__hash_open(const
char *, int, int, int, const HASHINFO *);*
 hence changed the original code to: *return ((DBM *)__hash_open(path,
flags, mode, 0, &info));*


> +}
> +
> +extern void
> +dbm_close(DBM *db)
> +{
> +       (void)(db->close)(db);
> +}
> +
> +/*
> + * Returns:
> + *     DATUM on success
> + *     NULL on failure
> + */
> +extern datum
> +dbm_fetch(DBM *db, datum key)
> +{
> +       datum retdata;
> +       int status;
> +       DBT dbtkey, dbtretdata;
> +
> +       dbtkey.data = key.dptr;
> +       dbtkey.size = key.dsize;
> +       status = (db->get)(db, &dbtkey, &dbtretdata, 0);
> +       if (status) {
> +               dbtretdata.data = NULL;
> +               dbtretdata.size = 0;
> +       }
> +       retdata.dptr = dbtretdata.data;
> +       retdata.dsize = dbtretdata.size;
> +       return (retdata);
> +}
> +
> +/*
> + * Returns:
> + *     DATUM on success
> + *     NULL on failure
> + */
> +extern datum
> +dbm_firstkey(DBM *db)
> +{
> +       int status;
> +       datum retkey;
> +       DBT dbtretkey, dbtretdata;
> +
> +       status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
> +       if (status)
> +               dbtretkey.data = NULL;
> +       retkey.dptr = dbtretkey.data;
> +       retkey.dsize = dbtretkey.size;
> +       return (retkey);
> +}
> +
> +/*
> + * Returns:
> + *     DATUM on success
> + *     NULL on failure
> + */
> +extern datum
> +dbm_nextkey(DBM *db)
> +{
> +       int status;
> +       datum retkey;
> +       DBT dbtretkey, dbtretdata;
> +
> +       status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
> +       if (status)
> +               dbtretkey.data = NULL;
> +       retkey.dptr = dbtretkey.data;
> +       retkey.dsize = dbtretkey.size;
> +       return (retkey);
> +}
> +
> +/*
> + * Returns:
> + *      0 on success
> + *     <0 failure
> + */
> +extern int
> +dbm_delete(DBM *db, datum key)
> +{
> +       int status;
> +       DBT dbtkey;
> +
> +       dbtkey.data = key.dptr;
> +       dbtkey.size = key.dsize;
> +       status = (db->del)(db, &dbtkey, 0);
> +       if (status)
> +               return (-1);
> +       else
> +               return (0);
> +}
> +
> +/*
> + * Returns:
> + *      0 on success
> + *     <0 failure
> + *      1 if DBM_INSERT and entry exists
> + */
> +extern int
> +dbm_store(DBM *db, datum key, datum data, int flags)
> +{
> +       DBT dbtkey, dbtdata;
> +
> +       dbtkey.data = key.dptr;
> +       dbtkey.size = key.dsize;
> +       dbtdata.data = data.dptr;
> +       dbtdata.size = data.dsize;
> +       return ((db->put)(db, &dbtkey, &dbtdata,
> +           (flags == DBM_INSERT) ? R_NOOVERWRITE : 0));
> +}
> +
> +extern int
> +dbm_error(DBM *db)
> +{
> +       HTAB *hp;
> +
> +       hp = (HTAB *)db->internal;
> +       return (hp->error);
> +}
> +
> +extern int
> +dbm_clearerr(DBM *db)
> +{
> +       HTAB *hp;
> +
> +       hp = (HTAB *)db->internal;
> +       hp->error = 0;
> +       return (0);
> +}
> +
> +extern int
> +dbm_dirfno(DBM *db)
> +{
> +       return(((HTAB *)db->internal)->fp);
> +}
> --
> 2.21.0
>
>
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