gdbm.c

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#include "config.h"
#include <gdbm.h>
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include "mutt/lib.h"
#include "lib.h"

static StoreHandle *store_gdbm_open(const char *path, bool create)
{
  if (!path)
    return NULL;
 
  const int pagesize = 4096;
 
  GDBM_FILE db = gdbm_open((char *) path, pagesize,
                           create ? GDBM_WRCREAT : GDBM_WRITER, 00600, NULL);
  if (!db)
  {
    /* if rw failed try ro */
    db = gdbm_open((char *) path, pagesize, GDBM_READER, 00600, NULL);
  }
 
  // Return an opaque pointer
  return (StoreHandle *) db;
}

static void *store_gdbm_fetch(StoreHandle *store, const char *key, size_t klen, size_t *vlen)
{
  if (!store || (klen > INT_MAX))
    return NULL;
 
  datum dkey = { 0 };
  datum data = { 0 };
 
  // Decloak an opaque pointer
  GDBM_FILE db = store;
 
  dkey.dptr = (char *) key;
  dkey.dsize = klen;
  data = gdbm_fetch(db, dkey);
 
  *vlen = data.dsize;
  return data.dptr;
}

static void store_gdbm_free(StoreHandle *store, void **ptr)
{
  FREE(ptr);
}

static int store_gdbm_store(StoreHandle *store, const char *key, size_t klen,
                            void *value, size_t vlen)
{
  if (!store || (klen > INT_MAX) || (vlen > INT_MAX))
    return -1;
 
  datum dkey = { 0 };
  datum databuf = { 0 };
 
  // Decloak an opaque pointer
  GDBM_FILE db = store;
 
  dkey.dptr = (char *) key;
  dkey.dsize = klen;
 
  databuf.dsize = vlen;
  databuf.dptr = value;
 
  return gdbm_store(db, dkey, databuf, GDBM_REPLACE);
}

static int store_gdbm_delete_record(StoreHandle *store, const char *key, size_t klen)
{
  if (!store || (klen > INT_MAX))
    return -1;
 
  datum dkey = { 0 };
 
  // Decloak an opaque pointer
  GDBM_FILE db = store;
 
  dkey.dptr = (char *) key;
  dkey.dsize = klen;
 
  return gdbm_delete(db, dkey);
}

static void store_gdbm_close(StoreHandle **ptr)
{
  if (!ptr || !*ptr)
    return;
 
  // Decloak an opaque pointer
  GDBM_FILE db = *ptr;
  gdbm_close(db);
  *ptr = NULL;
}

static const char *store_gdbm_version(void)
{
  return gdbm_version;
}
 
STORE_BACKEND_OPS(gdbm)