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/*
* Message database management.
*/
#include <stdlib.h>
#include <string.h>
#include "params.h"
#include "database.h"
struct db_main db;
void db_init(void)
{
db.head = db.tail = NULL;
db.total_count = 0;
db.total_size = 0;
db.flags = 0;
#if POP_SUPPORT_LAST
db.last = 0;
#endif
}
int db_add(struct db_message *msg)
{
struct db_message *entry;
if (db.total_count >= MAX_MAILBOX_MESSAGES) goto out_fail;
if (++db.total_count <= 0) goto out_undo_count;
if ((db.total_size += msg->size) < msg->size) goto out_undo_size;
entry = malloc(sizeof(struct db_message));
if (!entry) goto out_undo_size;
memcpy(entry, msg, sizeof(struct db_message));
entry->next = NULL;
entry->flags = 0;
if (db.tail)
db.tail = db.tail->next = entry;
else
db.tail = db.head = entry;
return 0;
out_undo_size:
db.total_size -= msg->size;
out_undo_count:
db.total_count--;
out_fail:
return 1;
}
int db_delete(struct db_message *msg)
{
if (msg->flags & MSG_DELETED) return 1;
msg->flags |= MSG_DELETED;
db.visible_count--;
db.visible_size -= msg->size;
db.flags |= DB_DIRTY;
return 0;
}
int db_fix(void)
{
unsigned long size;
struct db_message *entry;
unsigned int index;
db.visible_count = db.total_count;
db.visible_size = db.total_size;
if (!db.total_count) return 0;
size = sizeof(struct db_message *) * db.total_count;
if (size / sizeof(struct db_message *) != db.total_count) return 1;
db.array = malloc(size);
if (!db.array) return 1;
entry = db.head;
index = 0;
do {
db.array[index++] = entry;
} while ((entry = entry->next));
return 0;
}
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