mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-24 19:25:45 +08:00
62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
/** \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);
|
|
}
|