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/* timeval.c - functions to perform operations on struct timevals */
/* Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#if defined (HAVE_TIMEVAL)
#include <sys/types.h>
#include <posixtime.h>
#include <stdio.h>
struct timeval *
difftimeval (d, t1, t2)
struct timeval *d, *t1, *t2;
{
d->tv_sec = t2->tv_sec - t1->tv_sec;
d->tv_usec = t2->tv_usec - t1->tv_usec;
if (d->tv_usec < 0)
{
d->tv_usec += 1000000;
d->tv_sec -= 1;
if (d->tv_sec < 0) /* ??? -- BSD/OS does this */
{
d->tv_sec = 0;
d->tv_usec = 0;
}
}
return d;
}
struct timeval *
addtimeval (d, t1, t2)
struct timeval *d, *t1, *t2;
{
d->tv_sec = t1->tv_sec + t2->tv_sec;
d->tv_usec = t1->tv_usec + t2->tv_usec;
if (d->tv_usec >= 1000000)
{
d->tv_usec -= 1000000;
d->tv_sec += 1;
}
return d;
}
/* Do "cpu = ((user + sys) * 10000) / real;" with timevals.
Barely-tested code from Deven T. Corzine <deven@ties.org>. */
int
timeval_to_cpu (rt, ut, st)
struct timeval *rt, *ut, *st; /* real, user, sys */
{
struct timeval t1, t2;
register int i;
addtimeval (&t1, ut, st);
t2.tv_sec = rt->tv_sec;
t2.tv_usec = rt->tv_usec;
for (i = 0; i < 6; i++)
{
if ((t1.tv_sec > 99999999) || (t2.tv_sec > 99999999))
break;
t1.tv_sec *= 10;
t1.tv_sec += t1.tv_usec / 100000;
t1.tv_usec *= 10;
t1.tv_usec %= 1000000;
t2.tv_sec *= 10;
t2.tv_sec += t2.tv_usec / 100000;
t2.tv_usec *= 10;
t2.tv_usec %= 1000000;
}
for (i = 0; i < 4; i++)
{
if (t1.tv_sec < 100000000)
t1.tv_sec *= 10;
else
t2.tv_sec /= 10;
}
return ((t2.tv_sec == 0) ? 0 : t1.tv_sec / t2.tv_sec);
}
/* Convert a pointer to a struct timeval to seconds and thousandths of a
second, returning the values in *SP and *SFP, respectively. This does
rounding on the fractional part, not just truncation to three places. */
void
timeval_to_secs (tvp, sp, sfp)
struct timeval *tvp;
time_t *sp;
int *sfp;
{
int rest;
*sp = tvp->tv_sec;
*sfp = tvp->tv_usec % 1000000; /* pretty much a no-op */
rest = *sfp % 1000;
*sfp = (*sfp * 1000) / 1000000;
if (rest >= 500)
*sfp += 1;
/* Sanity check */
if (*sfp >= 1000)
{
*sp += 1;
*sfp -= 1000;
}
}
/* Print the contents of a struct timeval * in a standard way to stdio
stream FP. */
void
print_timeval (fp, tvp)
FILE *fp;
struct timeval *tvp;
{
time_t timestamp;
long minutes;
int seconds, seconds_fraction;
timeval_to_secs (tvp, ×tamp, &seconds_fraction);
minutes = timestamp / 60;
seconds = timestamp % 60;
fprintf (fp, "%ldm%d.%03ds", minutes, seconds, seconds_fraction);
}
#endif /* HAVE_TIMEVAL */
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