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/**
* @file stringref.c Reference-counted immutable strings
* @ingroup core
*/
/* purple
*
* Purple is the legal property of its developers, whose names are too numerous
* to list here. Please refer to the COPYRIGHT file distributed with this
* source distribution.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*
*/
#include "internal.h"
#include <string.h>
#include <stdarg.h>
#include "debug.h"
#include "eventloop.h"
#include "stringref.h"
/**
* The internal representation of a stringref.
*
* @note For this structure to be useful, the string contained within
* it must be immutable -- for this reason, do _not_ access it
* directly!
*/
struct _PurpleStringref {
guint32 ref; /**< The reference count of this string.
* Note that reference counts are only
* 31 bits, and the high-order bit
* indicates whether this string is up
* for GC at the next idle handler...
* But you aren't going to touch this
* anyway, right? */
char value[1]; /**< The string contained in this ref.
* Notice that it is simply "hanging
* off the end" of the ref ... this
* is to save an allocation. */
};
#define REFCOUNT(x) ((x) & 0x7fffffff)
static GList *gclist = NULL;
static void stringref_free(PurpleStringref *stringref);
static gboolean gs_idle_cb(gpointer data);
PurpleStringref *purple_stringref_new(const char *value)
{
PurpleStringref *newref;
if (value == NULL)
return NULL;
newref = g_malloc(sizeof(PurpleStringref) + strlen(value));
strcpy(newref->value, value);
newref->ref = 1;
return newref;
}
PurpleStringref *purple_stringref_new_noref(const char *value)
{
PurpleStringref *newref;
if (value == NULL)
return NULL;
newref = g_malloc(sizeof(PurpleStringref) + strlen(value));
strcpy(newref->value, value);
newref->ref = 0x80000000;
if (gclist == NULL)
purple_timeout_add(0, gs_idle_cb, NULL);
gclist = g_list_prepend(gclist, newref);
return newref;
}
PurpleStringref *purple_stringref_printf(const char *format, ...)
{
PurpleStringref *newref;
va_list ap;
if (format == NULL)
return NULL;
va_start(ap, format);
newref = g_malloc(sizeof(PurpleStringref) + g_printf_string_upper_bound(format, ap));
vsprintf(newref->value, format, ap);
va_end(ap);
newref->ref = 1;
return newref;
}
PurpleStringref *purple_stringref_ref(PurpleStringref *stringref)
{
if (stringref == NULL)
return NULL;
stringref->ref++;
return stringref;
}
void purple_stringref_unref(PurpleStringref *stringref)
{
if (stringref == NULL)
return;
if (REFCOUNT(--(stringref->ref)) == 0) {
if (stringref->ref & 0x80000000)
gclist = g_list_remove(gclist, stringref);
stringref_free(stringref);
}
}
const char *purple_stringref_value(const PurpleStringref *stringref)
{
return (stringref == NULL ? NULL : stringref->value);
}
int purple_stringref_cmp(const PurpleStringref *s1, const PurpleStringref *s2)
{
return (s1 == s2 ? 0 : strcmp(purple_stringref_value(s1), purple_stringref_value(s2)));
}
size_t purple_stringref_len(const PurpleStringref *stringref)
{
return strlen(purple_stringref_value(stringref));
}
static void stringref_free(PurpleStringref *stringref)
{
#ifdef DEBUG
if (REFCOUNT(stringref->ref) != 0) {
purple_debug(PURPLE_DEBUG_ERROR, "stringref", "Free of nonzero (%d) ref stringref!\n", REFCOUNT(stringref->ref));
return;
}
#endif /* DEBUG */
g_free(stringref);
}
static gboolean gs_idle_cb(gpointer data)
{
PurpleStringref *ref;
GList *del;
while (gclist != NULL) {
ref = gclist->data;
if (REFCOUNT(ref->ref) == 0) {
stringref_free(ref);
}
del = gclist;
gclist = gclist->next;
g_list_free_1(del);
}
return FALSE;
}
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