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/*
* db_delete.c: dbdelete(), database delete routine.
*
* Copyright (C) 1994, 1995 Graeme W. Wilford. (Wilf.)
* Copyright (C) 2001, 2002 Colin Watson.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Mon Aug 8 20:35:30 BST 1994 Wilf. (G.Wilford@ee.surrey.ac.uk)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "gettext.h"
#define _(String) gettext (String)
#include "manconfig.h"
#include "error.h"
#include "mydbm.h"
#include "db_storage.h"
/* Delete an entry for a page.
Again, 3 possibilities:
1) page is singular reference, just delete it :)
2) page has 2+ companions. Delete page and alter multi entry to not
point to it anymore.
3) page has 1 companion. Could do as (2), but we'd waste an entry in
the db. Should delete page, extract friend and reinsert as singular,
overwriting the old multi entry.
*/
#define NO_ENTRY 1;
int dbdelete (MYDBM_FILE dbf, const char *name, struct mandata *info)
{
datum key, cont;
memset (&key, 0, sizeof key);
memset (&cont, 0, sizeof cont);
/* get entry for info */
debug ("Attempting delete of %s(%s) entry.\n", name, info->ext);
MYDBM_SET (key, name_to_key (name));
cont = MYDBM_FETCH (dbf, key);
if (!MYDBM_DPTR (cont)) { /* 0 entries */
MYDBM_FREE_DPTR (key);
return NO_ENTRY;
} else if (*MYDBM_DPTR (cont) != '\t') { /* 1 entry */
MYDBM_DELETE (dbf, key);
MYDBM_FREE_DPTR (cont);
} else { /* 2+ entries */
char **names, **ext;
char *multi_content = NULL;
datum multi_key;
int refs, i, j;
/* Extract all of the extensions associated with
this key */
refs = list_extensions (MYDBM_DPTR (cont) + 1, &names, &ext);
for (i = 0; i < refs; ++i)
if (STREQ (names[i], name) &&
STREQ (ext[i], info->ext))
break;
if (i >= refs) {
free (names);
free (ext);
MYDBM_FREE_DPTR (cont);
MYDBM_FREE_DPTR (key);
return NO_ENTRY;
}
multi_key = make_multi_key (names[i], ext[i]);
if (!MYDBM_EXISTS (dbf, multi_key)) {
error (0, 0,
_( "multi key %s does not exist"),
MYDBM_DPTR (multi_key));
gripe_corrupt_data ();
}
MYDBM_DELETE (dbf, multi_key);
MYDBM_FREE_DPTR (multi_key);
/* refs *may* be 1 if all manual pages with this name
have been deleted. In this case, we'll have to remove
the key too */
if (refs == 1) {
free (names);
free (ext);
MYDBM_FREE_DPTR (cont);
MYDBM_DELETE (dbf, key);
MYDBM_FREE_DPTR (key);
return 0;
}
/* create our new multi content */
for (j = 0; j < refs; ++j)
if (i != j)
multi_content = appendstr (multi_content,
"\t", names[j],
"\t", ext[j],
(void *) 0);
MYDBM_FREE_DPTR (cont);
/* if refs = 2 do something else. Doesn't really matter as
the gdbm db file does not shrink any after a deletion
anyway */
MYDBM_SET (cont, multi_content);
if (MYDBM_REPLACE (dbf, key, cont))
gripe_replace_key (MYDBM_DPTR (key));
free (names);
free (ext);
}
MYDBM_FREE_DPTR (key);
return 0;
}
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