* [PATCH] builtin: Fix seconds part of times(1)
[not found] <m2r281wn3m.fsf@pomona.edu>
@ 2020-01-20 9:46 ` Herbert Xu
2020-01-20 15:09 ` Michael Greenberg
0 siblings, 1 reply; 2+ messages in thread
From: Herbert Xu @ 2020-01-20 9:46 UTC (permalink / raw)
To: Michael Greenberg; +Cc: dash
On Mon, Jun 10, 2019 at 02:07:11PM +0000, Michael Greenberg wrote:
>
> If folks are opposed to including math.h for some reason, I'm sure the
> computation could be done another way.
Thanks for the patch. Yes I would like to avoid the libm dependency.
How about something like this:
---8<---
The seconds part of the times(1) built-in is wrong as it does not
exclude the minutes part of the result. This patch fixes it.
This problem was first noted by Michael Greenberg who also sent
a similar patch.
Reported-by: Michael Greenberg <michael.greenberg@pomona.edu>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/src/bltin/times.c b/src/bltin/times.c
index 8eabc1f..1166a68 100644
--- a/src/bltin/times.c
+++ b/src/bltin/times.c
@@ -15,16 +15,28 @@
int timescmd() {
struct tms buf;
long int clk_tck = sysconf(_SC_CLK_TCK);
+ int mutime, mstime, mcutime, mcstime;
+ double utime, stime, cutime, cstime;
times(&buf);
- printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n",
- (int) (buf.tms_utime / clk_tck / 60),
- ((double) buf.tms_utime) / clk_tck,
- (int) (buf.tms_stime / clk_tck / 60),
- ((double) buf.tms_stime) / clk_tck,
- (int) (buf.tms_cutime / clk_tck / 60),
- ((double) buf.tms_cutime) / clk_tck,
- (int) (buf.tms_cstime / clk_tck / 60),
- ((double) buf.tms_cstime) / clk_tck);
+
+ utime = (double)buf.tms_utime / clk_tck;
+ mutime = utime / 60;
+ utime -= mutime * 60.0;
+
+ stime = (double)buf.tms_stime / clk_tck;
+ mstime = stime / 60;
+ stime -= mstime * 60.0;
+
+ cutime = (double)buf.tms_cutime / clk_tck;
+ mcutime = cutime / 60;
+ cutime -= mcutime * 60.0;
+
+ cstime = (double)buf.tms_cstime / clk_tck;
+ mcstime = cstime / 60;
+ cstime -= mcstime * 60.0;
+
+ printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n", mutime, utime, mstime, stime,
+ mcutime, cutime, mcstime, cstime);
return 0;
}
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] builtin: Fix seconds part of times(1)
2020-01-20 9:46 ` [PATCH] builtin: Fix seconds part of times(1) Herbert Xu
@ 2020-01-20 15:09 ` Michael Greenberg
0 siblings, 0 replies; 2+ messages in thread
From: Michael Greenberg @ 2020-01-20 15:09 UTC (permalink / raw)
To: Herbert Xu; +Cc: dash
Looks great! Thanks for getting to this. :)
Cheers,
Michael
On Mon, Jan 20 2020, Herbert Xu wrote:
> On Mon, Jun 10, 2019 at 02:07:11PM +0000, Michael Greenberg wrote:
>>
>> If folks are opposed to including math.h for some reason, I'm sure the
>> computation could be done another way.
>
> Thanks for the patch. Yes I would like to avoid the libm dependency.
> How about something like this:
>
> ---8<---
> The seconds part of the times(1) built-in is wrong as it does not
> exclude the minutes part of the result. This patch fixes it.
>
> This problem was first noted by Michael Greenberg who also sent
> a similar patch.
>
> Reported-by: Michael Greenberg <michael.greenberg@pomona.edu>
> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
>
> diff --git a/src/bltin/times.c b/src/bltin/times.c
> index 8eabc1f..1166a68 100644
> --- a/src/bltin/times.c
> +++ b/src/bltin/times.c
> @@ -15,16 +15,28 @@
> int timescmd() {
> struct tms buf;
> long int clk_tck = sysconf(_SC_CLK_TCK);
> + int mutime, mstime, mcutime, mcstime;
> + double utime, stime, cutime, cstime;
>
> times(&buf);
> - printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n",
> - (int) (buf.tms_utime / clk_tck / 60),
> - ((double) buf.tms_utime) / clk_tck,
> - (int) (buf.tms_stime / clk_tck / 60),
> - ((double) buf.tms_stime) / clk_tck,
> - (int) (buf.tms_cutime / clk_tck / 60),
> - ((double) buf.tms_cutime) / clk_tck,
> - (int) (buf.tms_cstime / clk_tck / 60),
> - ((double) buf.tms_cstime) / clk_tck);
> +
> + utime = (double)buf.tms_utime / clk_tck;
> + mutime = utime / 60;
> + utime -= mutime * 60.0;
> +
> + stime = (double)buf.tms_stime / clk_tck;
> + mstime = stime / 60;
> + stime -= mstime * 60.0;
> +
> + cutime = (double)buf.tms_cutime / clk_tck;
> + mcutime = cutime / 60;
> + cutime -= mcutime * 60.0;
> +
> + cstime = (double)buf.tms_cstime / clk_tck;
> + mcstime = cstime / 60;
> + cstime -= mcstime * 60.0;
> +
> + printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n", mutime, utime, mstime, stime,
> + mcutime, cutime, mcstime, cstime);
> return 0;
> }
> --
> Email: Herbert Xu <herbert@gondor.apana.org.au>
> Home Page: https://nam01.safelinks.protection.outlook.com/?url=http:%2F%2Fgondor.apana.org.au%2F~herbert%2F&data=02%7C01%7CMichael.Greenberg%40pomona.edu%7Cdd48fafec4ff4860dd3d08d79d8dae5a%7C817f590439044ee8b3a5a65d4746ff70%7C0%7C0%7C637151104157970338&sdata=50I8unmDcArdkRhrzECnv4S05daM6cq1az7SBENGpG4%3D&reserved=0
> PGP Key: https://nam01.safelinks.protection.outlook.com/?url=http:%2F%2Fgondor.apana.org.au%2F~herbert%2Fpubkey.txt&data=02%7C01%7CMichael.Greenberg%40pomona.edu%7Cdd48fafec4ff4860dd3d08d79d8dae5a%7C817f590439044ee8b3a5a65d4746ff70%7C0%7C0%7C637151104157970338&sdata=1wrzxGBArZ5YVQCKV%2BdYH03e0v0wevKHFnfYcCgwQWM%3D&reserved=0
> ________________________________
>
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2020-01-20 9:46 ` [PATCH] builtin: Fix seconds part of times(1) Herbert Xu
2020-01-20 15:09 ` Michael Greenberg
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