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78 lines
1.9 KiB
C++
78 lines
1.9 KiB
C++
/* -*-mode: C; fill-column: 78; c-basic-offset: 4; -*- */
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/*
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* Copyright 2005 by Eric House (xwords@eehouse.org). All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "permid.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "mlock.h"
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using namespace std;
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pthread_mutex_t PermID::s_guard = PTHREAD_MUTEX_INITIALIZER;
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string PermID::s_serverName;
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string PermID::s_idFileName;
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string
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PermID::GetNextUniqueID()
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{
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const char* fileName = s_idFileName.c_str();
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MutexLock ml( &s_guard );
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string s = s_serverName;
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assert( s.length() > 0 );
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s += ":";
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char buf[32]; /* should last for a while :-) */
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FILE* f = fopen( fileName, "r+" );
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if ( f ) {
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fscanf( f, "%s\n", buf );
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rewind( f );
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} else {
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f = fopen( fileName, "w" );
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assert ( f != NULL );
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buf[0] = '0';
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buf[1] = '\0';
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}
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int n = atoi(buf) + 1;
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sprintf( buf, "%d", n );
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fprintf( f, "%s\n", buf );
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fclose( f );
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s += buf;
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return s;
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}
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/* static */ void
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PermID::SetServerName( const char* name )
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{
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s_serverName = name;
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}
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/* static */ void
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PermID::SetIDFileName( const char* name )
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{
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s_idFileName = name;
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}
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