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strshare.c
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strshare.c
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/*
* atheme-services: A collection of minimalist IRC services
* strshare.c: Shared strings.
*
* Copyright (c) 2008 Atheme Project (http://www.atheme.org)
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "atheme.h"
mowgli_patricia_t *strshare_dict;
typedef struct
{
int refcount;
} strshare_t;
void strshare_init(void)
{
strshare_dict = mowgli_patricia_create(noopcanon);
}
stringref strshare_get(const char *str)
{
strshare_t *ss;
if (str == NULL)
return NULL;
ss = mowgli_patricia_retrieve(strshare_dict, str);
if (ss != NULL)
ss->refcount++;
else
{
ss = smalloc(sizeof(strshare_t) + strlen(str) + 1);
ss->refcount = 1;
strcpy((char *)(ss + 1), str);
mowgli_patricia_add(strshare_dict, (char *)(ss + 1), ss);
}
return (char *)(ss + 1);
}
stringref strshare_ref(stringref str)
{
strshare_t *ss;
if (str == NULL)
return NULL;
/* intermediate cast to suppress gcc -Wcast-qual */
ss = (strshare_t *)(uintptr_t)str - 1;
ss->refcount++;
return str;
}
void strshare_unref(stringref str)
{
strshare_t *ss;
if (str == NULL)
return;
/* intermediate cast to suppress gcc -Wcast-qual */
ss = (strshare_t *)(uintptr_t)str - 1;
ss->refcount--;
if (ss->refcount == 0)
{
mowgli_patricia_delete(strshare_dict, str);
free(ss);
}
}
/* vim:cinoptions=>s,e0,n0,f0,{0,}0,^0,=s,ps,t0,c3,+s,(2s,us,)20,*30,gs,hs
* vim:ts=8
* vim:sw=8
* vim:noexpandtab
*/