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