144 lines
3.8 KiB
C
144 lines
3.8 KiB
C
/*
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* db_delete.c: dbdelete(), database delete routine.
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*
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* Copyright (C) 1994, 1995 Graeme W. Wilford. (Wilf.)
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* Copyright (C) 2001, 2002 Colin Watson.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Mon Aug 8 20:35:30 BST 1994 Wilf. (G.Wilford@ee.surrey.ac.uk)
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif /* HAVE_CONFIG_H */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "error.h"
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#include "gl_list.h"
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#include "xalloc.h"
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#include "gettext.h"
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#define _(String) gettext (String)
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#include "manconfig.h"
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#include "appendstr.h"
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#include "debug.h"
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#include "filenames.h"
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#include "glcontainers.h"
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#include "db_storage.h"
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#include "mydbm.h"
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/* Delete an entry for a page.
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Again, 3 possibilities:
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1) page is singular reference, just delete it :)
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2) page has 2+ companions. Delete page and alter multi entry to not
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point to it anymore.
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3) page has 1 companion. Could do as (2), but we'd waste an entry in
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the db. Should delete page, extract friend and reinsert as singular,
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overwriting the old multi entry.
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*/
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#define NO_ENTRY 1;
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int dbdelete (MYDBM_FILE dbf, const char *name, struct mandata *info)
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{
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datum key, cont;
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memset (&key, 0, sizeof key);
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memset (&cont, 0, sizeof cont);
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/* get entry for info */
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debug ("Attempting delete of %s(%s) entry.\n", name, info->ext);
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MYDBM_SET (key, name_to_key (name));
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cont = MYDBM_FETCH (dbf, key);
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if (!MYDBM_DPTR (cont)) { /* 0 entries */
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MYDBM_FREE_DPTR (key);
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return NO_ENTRY;
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} else if (*MYDBM_DPTR (cont) != '\t') { /* 1 entry */
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MYDBM_DELETE (dbf, key);
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MYDBM_FREE_DPTR (cont);
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} else { /* 2+ entries */
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gl_list_t refs;
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struct name_ext this_ref, *ref;
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size_t this_index;
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char *multi_content = NULL;
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datum multi_key;
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/* Extract all of the extensions associated with
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this key */
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refs = list_extensions (MYDBM_DPTR (cont) + 1);
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this_ref.name = name;
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this_ref.ext = info->ext;
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this_index = gl_list_indexof (refs, &this_ref);
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if (this_index == (size_t) -1) {
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gl_list_free (refs);
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MYDBM_FREE_DPTR (cont);
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MYDBM_FREE_DPTR (key);
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return NO_ENTRY;
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}
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multi_key = make_multi_key (name, info->ext);
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if (!MYDBM_EXISTS (dbf, multi_key)) {
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error (0, 0, _ ("multi key %s does not exist"),
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MYDBM_DPTR (multi_key));
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gripe_corrupt_data (dbf);
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}
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MYDBM_DELETE (dbf, multi_key);
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MYDBM_FREE_DPTR (multi_key);
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gl_list_remove_at (refs, this_index);
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/* If all manual pages with this name have been deleted,
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we'll have to remove the key too. */
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if (!gl_list_size (refs)) {
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gl_list_free (refs);
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MYDBM_FREE_DPTR (cont);
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MYDBM_DELETE (dbf, key);
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MYDBM_FREE_DPTR (key);
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return 0;
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}
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/* create our new multi content */
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multi_content = xstrdup ("");
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GL_LIST_FOREACH (refs, ref)
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multi_content =
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appendstr (multi_content, "\t", ref->name,
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"\t", ref->ext, nullptr);
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MYDBM_FREE_DPTR (cont);
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MYDBM_SET (cont, multi_content);
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if (MYDBM_REPLACE (dbf, key, cont))
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gripe_replace_key (dbf, MYDBM_DPTR (key));
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gl_list_free (refs);
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}
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MYDBM_FREE_DPTR (key);
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return 0;
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}
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