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/*
* strpool.c
* Copyright 2011 John Lindgren
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions, and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions, and the following disclaimer in the documentation
* provided with the distribution.
*
* This software is provided "as is" and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising from
* the use of this software.
*/
#include <glib.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "core.h"
/* Each string in the pool is allocated with five leading bytes: a 32-bit
* reference count and a one-byte signature, the '@' character. */
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static GHashTable * table;
#ifdef STRPOOL_DEBUG
static GHashTable * logged;
static void str_log (const char * str, const char * op, const char * file, int line)
{
if (! logged)
logged = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
GList * list = g_hash_table_lookup (logged, str);
list = g_list_prepend (list, g_strdup_printf ("%s by %s:%d", op, file, line));
g_hash_table_insert (logged, g_strdup (str), list);
}
static void str_log_dump (const char * str)
{
if (! logged)
return;
for (GList * node = g_hash_table_lookup (logged, str); node; node = node->next)
printf (" - %s\n", (char *) node->data);
}
#endif
static void str_destroy (void * str)
{
* ((char *) str - 1) = 0;
free ((char *) str - 5);
}
#ifdef STRPOOL_DEBUG
EXPORT char * str_get_debug (const char * str, const char * file, int line)
#else
EXPORT char * str_get (const char * str)
#endif
{
if (! str)
return NULL;
char * copy;
pthread_mutex_lock (& mutex);
#ifdef STRPOOL_DEBUG
str_log (str, "get", file, line);
#endif
if (! table)
table = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, str_destroy);
if ((copy = g_hash_table_lookup (table, str)))
{
void * mem = copy - 5;
(* (int32_t *) mem) ++;
}
else
{
void * mem = malloc (6 + strlen (str));
(* (int32_t *) mem) = 1;
copy = (char *) mem + 5;
copy[-1] = '@';
strcpy (copy, str);
g_hash_table_insert (table, copy, copy);
}
pthread_mutex_unlock (& mutex);
return copy;
}
#ifdef STRPOOL_DEBUG
EXPORT char * str_ref_debug (char * str, const char * file, int line)
#else
EXPORT char * str_ref (char * str)
#endif
{
if (! str)
return NULL;
pthread_mutex_lock (& mutex);
STR_CHECK (str);
#ifdef STRPOOL_DEBUG
str_log (str, "ref", file, line);
#endif
void * mem = str - 5;
(* (int32_t *) mem) ++;
pthread_mutex_unlock (& mutex);
return str;
}
#ifdef STRPOOL_DEBUG
EXPORT void str_unref_debug (char * str, const char * file, int line)
#else
EXPORT void str_unref (char * str)
#endif
{
if (! str)
return;
pthread_mutex_lock (& mutex);
STR_CHECK (str);
#ifdef STRPOOL_DEBUG
str_log (str, "unref", file, line);
#endif
void * mem = str - 5;
if (! -- (* (int32_t *) mem))
g_hash_table_remove (table, str);
pthread_mutex_unlock (& mutex);
}
EXPORT char * str_nget (const char * str, int len)
{
if (strlen (str) <= len)
return str_get (str);
char buf[len + 1];
memcpy (buf, str, len);
buf[len] = 0;
return str_get (buf);
}
EXPORT char * str_printf (const char * format, ...)
{
va_list args;
va_start (args, format);
int len = vsnprintf (NULL, 0, format, args);
va_end (args);
char buf[len + 1];
va_start (args, format);
vsnprintf (buf, sizeof buf, format, args);
va_end (args);
return str_get (buf);
}
EXPORT void strpool_abort (char * str)
{
fprintf (stderr, "String not in pool: %s\n", str);
#ifdef STRPOOL_DEBUG
str_log_dump (str);
#endif
abort ();
}
static void str_leaked (void * key, void * str, void * unused)
{
fprintf (stderr, "String not freed: %s\n", (char *) str);
#ifdef STRPOOL_DEBUG
str_log_dump (str);
#endif
}
EXPORT void strpool_shutdown (void)
{
if (! table)
return;
g_hash_table_foreach (table, str_leaked, NULL);
g_hash_table_destroy (table);
table = NULL;
}
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