michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: 
michael@0: #define INCL_DOS
michael@0: #define INCL_DOSERRORS
michael@0: #include <os2.h>
michael@0: #include <stdlib.h>
michael@0: #include <time.h>
michael@0: #include "primpl.h"
michael@0: 
michael@0: static BOOL clockTickTime(unsigned long *phigh, unsigned long *plow)
michael@0: {
michael@0:     APIRET rc = NO_ERROR;
michael@0:     QWORD qword = {0,0};
michael@0: 
michael@0:     rc = DosTmrQueryTime(&qword);
michael@0:     if (rc != NO_ERROR)
michael@0:        return FALSE;
michael@0: 
michael@0:     *phigh = qword.ulHi;
michael@0:     *plow  = qword.ulLo;
michael@0: 
michael@0:     return TRUE;
michael@0: }
michael@0: 
michael@0: extern PRSize _PR_MD_GetRandomNoise(void *buf, PRSize size )
michael@0: {
michael@0:     unsigned long high = 0;
michael@0:     unsigned long low  = 0;
michael@0:     clock_t val = 0;
michael@0:     int n = 0;
michael@0:     int nBytes = 0;
michael@0:     time_t sTime;
michael@0: 
michael@0:     if (size <= 0)
michael@0:        return 0;
michael@0: 
michael@0:     clockTickTime(&high, &low);
michael@0: 
michael@0:     /* get the maximally changing bits first */
michael@0:     nBytes = sizeof(low) > size ? size : sizeof(low);
michael@0:     memcpy(buf, &low, nBytes);
michael@0:     n += nBytes;
michael@0:     size -= nBytes;
michael@0: 
michael@0:     if (size <= 0)
michael@0:        return n;
michael@0: 
michael@0:     nBytes = sizeof(high) > size ? size : sizeof(high);
michael@0:     memcpy(((char *)buf) + n, &high, nBytes);
michael@0:     n += nBytes;
michael@0:     size -= nBytes;
michael@0: 
michael@0:     if (size <= 0)
michael@0:        return n;
michael@0: 
michael@0:     /* get the number of milliseconds that have elapsed since application started */
michael@0:     val = clock();
michael@0: 
michael@0:     nBytes = sizeof(val) > size ? size : sizeof(val);
michael@0:     memcpy(((char *)buf) + n, &val, nBytes);
michael@0:     n += nBytes;
michael@0:     size -= nBytes;
michael@0: 
michael@0:     if (size <= 0)
michael@0:        return n;
michael@0: 
michael@0:     /* get the time in seconds since midnight Jan 1, 1970 */
michael@0:     time(&sTime);
michael@0:     nBytes = sizeof(sTime) > size ? size : sizeof(sTime);
michael@0:     memcpy(((char *)buf) + n, &sTime, nBytes);
michael@0:     n += nBytes;
michael@0: 
michael@0:     return n;
michael@0: }