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/*
* db_delete.c: dbdelete(), database delete routine.
*
* Copyright (C), 1994, 1995, Graeme W. Wilford. (Wilf.)
*
* You may distribute under the terms of the GNU Library General Public
* License as specified in the file COPYING.LIB that comes with this
* distribution.
*
* 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 <assert.h>
#if defined(STDC_HEADERS)
#include <string.h>
#include <stdlib.h>
#elif defined(HAVE_STRING_H)
#include <string.h>
#elif defined(HAVE_STRINGS_H)
#include <strings.h>
#else /* no string(s) header file */
extern char *strtok();
extern char *strsep();
#endif /* STDC_HEADERS */
#if defined(HAVE_UNISTD_H)
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifndef STDC_HEADERS
extern long atol();
extern char *strsep();
#endif /* not STDC_HEADERS */
#define NLS_SET db_deleteSet
#include <libintl.h>
#define _(String) gettext (String)
#include "manconfig.h"
#include "lib/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(char *name, struct mandata *info)
{
datum key, cont;
/* get entry for info */
if (debug)
fprintf(stderr, "Attempting delete of %s(%s) entry.\n",
name, info->ext);
key.dptr = name;
key.dsize = strlen(key.dptr) + 1;
cont = MYDBM_FETCH(dbf, key);
if (!cont.dptr) { /* 0 entries */
return NO_ENTRY;
} else if (*cont.dptr != '\t') { /* 1 entry */
MYDBM_DELETE(dbf, key);
MYDBM_FREE(cont.dptr);
} else { /* 2+ entries */
char *ext[ENTRIES], **e;
char *multi_content = NULL;
datum multi_key;
int refs;
/* Extract all of the extensions associated with
this key */
refs = list_extensions(cont.dptr + 1, e = ext);
while (*e && strcmp(*e, info->ext) != 0)
e++;
if (!*e) {
MYDBM_FREE(cont.dptr);
return NO_ENTRY;
}
multi_key = make_multi_key(name, *e);
if (!MYDBM_EXISTS(dbf, multi_key)) {
error (0, 0,
_( "multi key %s does not exist"),
multi_key.dptr);
gripe_corrupt_data();
}
MYDBM_DELETE(dbf, multi_key);
free(multi_key.dptr);
**e = '\0';
/* 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) {
MYDBM_FREE(cont.dptr);
MYDBM_DELETE(dbf, key);
return 0;
}
/* create our new multi content */
for (e = ext; *e; e++) {
if (**e)
multi_content = strappend(multi_content,
"\t", *e, NULL);
}
MYDBM_FREE(cont.dptr);
/* if refs = 2 do something else. Doesn't really matter as
the gdbm db file does not shrink any after a deletion
anyway */
cont.dptr = multi_content;
cont.dsize = strlen(cont.dptr) + 1;
if (MYDBM_REPLACE(dbf, key, cont))
gripe_replace_key(key.dptr);
}
return 0;
}
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