source: roaraudio/libroar/kstore.c @ 5443:b57e144b3ddf

//kstore.c:

/*
 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2012
 *
 *  This file is part of libroar a part of RoarAudio,
 *  a cross-platform sound system for both, home and professional use.
 *  See README for details.
 *
 *  This file is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 3
 *  as published by the Free Software Foundation.
 *
 *  libroar 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this software; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 *  NOTE for everyone want's to change something and send patches:
 *  read README and HACKING! There a addition information on
 *  the license of this document you need to read before you send
 *  any patches.
 *
 *  NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc
 *  or libpulse*:
 *  The libs libroaresd, libroararts and libroarpulse link this lib
 *  and are therefore GPL. Because of this it may be illigal to use
 *  them with any software that uses libesd, libartsc or libpulse*.
 */

#include "libroar.h"

#define _LEN_DEFAULT 16

struct binkv {
 const char * key;
 void * value;
};

struct roar_kstore {
 size_t refc;
 int (*ref)(void *);
 int (*unref)(void *);
 const char * (*get_key)(void *);
 size_t len;
 struct binkv * kv;
};

struct roar_kstore * roar_kstore_new(ssize_t len,
                                     int (*ref)(void *), int (*unref)(void *),
                                     const char * (*get_key)(void *)) {
 struct roar_kstore * ret = roar_mm_malloc(sizeof(struct roar_kstore));
 int err;

 if ( ret == NULL )
  return NULL;

 memset(ret, 0, sizeof(struct roar_kstore));

 if ( len == -1 )
  len = _LEN_DEFAULT;

 ret->kv = roar_mm_malloc(len*sizeof(struct binkv));
 if ( ret->kv == NULL ) {
  err = roar_error;
  roar_mm_free(ret);
  roar_error = err;
  return NULL;
 }

 memset(ret->kv, 0, len*sizeof(struct binkv));

 ret->refc    = 1;
 ret->ref     = ref;
 ret->unref   = unref;
 ret->get_key = get_key;
 ret->len     = len;

 return ret;
}

int                  roar_kstore_ref(struct roar_kstore * store) {
 if ( store == NULL ) {
  roar_err_set(ROAR_ERROR_FAULT);
  return -1;
 }

 store->refc++;

 return 0;
}

int                  roar_kstore_unref(struct roar_kstore * store) {
 size_t i;

 if ( store == NULL ) {
  roar_err_set(ROAR_ERROR_FAULT);
  return -1;
 }

 store->refc--;

 if ( store->refc )
  return 0;

 if ( store->unref != NULL ) {
  for (i = 0; i < store->len; i++) {
   if ( store->kv[i].key == NULL )
    continue;

   if ( store->unref(store->kv[i].value) == -1 )
    return -1;
   store->kv[i].key = NULL;
   store->kv[i].value = NULL;
  }
 }

 roar_mm_free(store->kv);
 roar_mm_free(store);

 return 0;
}

int                  roar_kstore_add(struct roar_kstore * store, void * obj, const char * key) {
 size_t i;

 if ( store == NULL ) {
  roar_err_set(ROAR_ERROR_FAULT);
  return -1;
 }

 if ( key == NULL && store->get_key != NULL )
  key = store->get_key(obj);

 if ( key == NULL ) {
  roar_err_set(ROAR_ERROR_INVAL);
  return -1;
 }

 for (i = 0; i < store->len; i++) {
  if ( store->kv[i].key == NULL )
   continue;
  if ( !strcmp(store->kv[i].key, key) ) {
   roar_err_set(ROAR_ERROR_EXIST);
   return -1;
  }
 }

 for (i = 0; i < store->len; i++) {
  if ( store->kv[i].key != NULL )
   continue;
  if ( store->ref != NULL )
   if ( store->ref(obj) == -1 )
    return -1;
  store->kv[i].key = key;
  store->kv[i].value = obj;
  return 0;
 }

 roar_err_set(ROAR_ERROR_NOSPC);
 return -1;
}

void *               roar_kstore_get(struct roar_kstore * store, const char * key) {
 size_t i;

 if ( store == NULL ) {
  roar_err_set(ROAR_ERROR_FAULT);
  return NULL;
 }

 for (i = 0; i < store->len; i++) {
  if ( store->kv[i].key != NULL && !strcmp(store->kv[i].key, key) ) {
   if ( store->ref != NULL )
    if ( store->ref(store->kv[i].value) == -1 )
     return NULL;
   return store->kv[i].value;
  }
 }

 roar_err_set(ROAR_ERROR_NOENT);
 return NULL;
}

int                  roar_kstore_delete(struct roar_kstore * store, const char * key) {
 size_t i;

 if ( store == NULL ) {
  roar_err_set(ROAR_ERROR_FAULT);
  return -1;
 }

 for (i = 0; i < store->len; i++) {
  if ( store->kv[i].key != NULL && !strcmp(store->kv[i].key, key) ) {
   if ( store->unref != NULL )
    if ( store->unref(store->kv[i].value) == -1 )
     return -1;
   store->kv[i].key = NULL;
   store->kv[i].value = NULL;
   return 0;
  }
 }

 roar_err_set(ROAR_ERROR_NOENT);
 return -1;
}

//ll