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/** \file intern.c
Library for pooling common strings
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <unistd.h>
#include <set>
#include "fallback.h"
#include "util.h"
#include "wutil.h"
#include "common.h"
#include "intern.h"
/** Comparison function for intern'd strings */
static bool string_table_compare(const wchar_t *a, const wchar_t *b) {
return wcscmp(a, b) < 0;
}
/** The table of intern'd strings */
typedef std::set<const wchar_t *, bool (*)(const wchar_t *, const wchar_t *b)> string_table_t;
static string_table_t string_table(string_table_compare);
/** The lock to provide thread safety for intern'd strings */
static pthread_mutex_t intern_lock = PTHREAD_MUTEX_INITIALIZER;
static const wchar_t *intern_with_dup( const wchar_t *in, bool dup )
{
if( !in )
return NULL;
// debug( 0, L"intern %ls", in );
scoped_lock lock(intern_lock);
const wchar_t *result;
string_table_t::const_iterator iter = string_table.find(in);
if (iter != string_table.end()) {
result = *iter;
} else {
result = dup ? wcsdup(in) : in;
string_table.insert(result);
}
return result;
}
const wchar_t *intern( const wchar_t *in )
{
return intern_with_dup(in, true);
}
const wchar_t *intern_static( const wchar_t *in )
{
return intern_with_dup(in, false);
}
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