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movq
Long time nixers
In essence, my "circular buffer" is just this:

Code:
size_t bufsize = ...;
size_t i = 0, fill = 0;
char *b = malloc(bufsize);

for (;;)
{
    b[i] = readByte(...);

    i++;
    i %= bufsize;

    fill++;
    fill = min(fill, bufsize);
}

Dead simple.

Starting from "i", I can go back to read the previous "fill" bytes (you'll have to wrap around, of course). (The real code reads larger chunks, not single bytes.)

The goal was to record audio data, continuously, for several hours. But: We are always only interested in the last 10 minutes. Data older than that can be discarded.

I have to admit that this was pretty much the first thing that came to my mind. I didn't really look for alternatives. Am I missing something here? :)


Messages In This Thread
UNIX Diary - by z3bra - 18-08-2014, 11:03 AM
RE: UNIX Diary - by venam - 18-08-2014, 11:37 AM
RE: UNIX Diary - by cjm - 18-08-2014, 12:01 PM
RE: UNIX Diary - by venam - 18-08-2014, 12:18 PM
RE: UNIX Diary - by cjm - 18-08-2014, 02:11 PM
RE: UNIX Diary - by venam - 19-08-2014, 12:50 PM
RE: UNIX Diary - by z3bra - 19-08-2014, 01:18 PM
RE: UNIX Diary - by pizzaroll1 - 19-08-2014, 02:15 PM
RE: UNIX Diary - by vompatti - 19-08-2014, 04:20 PM
RE: UNIX Diary - by pizzaroll1 - 19-08-2014, 07:53 PM
RE: UNIX Diary - by venam - 20-08-2014, 12:54 PM
RE: UNIX Diary - by vompatti - 20-08-2014, 06:33 PM
RE: UNIX Diary - by z3bra - 21-08-2014, 04:53 AM
RE: UNIX Diary - by DotDev - 21-08-2014, 07:50 AM
RE: UNIX Diary - by shtols - 21-08-2014, 12:55 PM
RE: UNIX Diary - by venam - 21-08-2014, 01:22 PM
RE: UNIX Diary - by venam - 23-08-2014, 06:55 AM
RE: UNIX Diary - by z3bra - 23-08-2014, 07:27 AM
RE: UNIX Diary - by venam - 24-08-2014, 04:39 AM
RE: UNIX Diary - by xero - 24-08-2014, 11:24 PM
RE: UNIX Diary - by pizzaroll1 - 25-08-2014, 12:37 PM
RE: UNIX Diary - by z3bra - 26-08-2014, 03:38 AM
RE: UNIX Diary - by cjm - 27-08-2014, 12:48 AM
RE: UNIX Diary - by xero - 28-08-2014, 11:11 AM
RE: UNIX Diary - by venam - 30-08-2014, 01:47 AM
RE: UNIX Diary - by kirby - 30-08-2014, 09:56 AM
RE: UNIX Diary - by venam - 30-08-2014, 11:22 AM
RE: UNIX Diary - by venam - 09-09-2014, 12:21 PM
RE: UNIX Diary - by venam - 04-11-2014, 12:27 AM
RE: UNIX Diary - by berk - 10-09-2014, 09:12 AM
RE: UNIX Diary - by xero - 10-09-2014, 10:53 AM
RE: UNIX Diary - by venam - 10-09-2014, 11:51 AM
RE: UNIX Diary - by xero - 11-09-2014, 11:18 AM
RE: UNIX Diary - by z3bra - 12-09-2014, 08:08 AM
RE: UNIX Diary - by xero - 17-09-2014, 10:51 AM
RE: UNIX Diary - by pizzaroll1 - 17-09-2014, 01:07 PM
RE: UNIX Diary - by hades - 17-09-2014, 07:47 PM
RE: UNIX Diary - by venam - 18-09-2014, 12:37 AM
RE: UNIX Diary - by xero - 18-09-2014, 10:51 AM
RE: UNIX Diary - by venam - 18-09-2014, 12:18 PM
RE: UNIX Diary - by earsplit - 19-09-2014, 02:23 PM
RE: UNIX Diary - by vompatti - 20-09-2014, 11:52 AM
RE: UNIX Diary - by pizzaroll1 - 20-09-2014, 08:00 PM
RE: UNIX Diary - by srp - 21-09-2014, 02:09 AM
RE: UNIX Diary - by kirby - 21-09-2014, 03:25 PM
RE: UNIX Diary - by venam - 30-09-2014, 01:00 PM
RE: UNIX Diary - by xero - 08-10-2014, 10:31 AM
RE: UNIX Diary - by cjm - 09-10-2014, 04:14 PM
RE: UNIX Diary - by kirby - 09-10-2014, 08:15 PM
RE: UNIX Diary - by JerrySpringerIsMyDad - 24-10-2014, 10:03 PM
RE: UNIX Diary - by xero - 28-10-2014, 10:38 AM
RE: UNIX Diary - by venam - 28-10-2014, 01:18 PM
RE: UNIX Diary - by neeasade - 09-01-2015, 10:44 AM
RE: UNIX Diary - by z3bra - 09-01-2015, 02:04 PM
RE: UNIX Diary - by z3bra - 19-02-2015, 07:05 AM
RE: UNIX Diary - by venam - 19-02-2015, 04:55 PM
RE: UNIX Diary - by xero - 20-02-2015, 11:49 AM
RE: UNIX Diary - by z3bra - 28-04-2015, 04:13 PM
RE: UNIX Diary - by bsdkeith - 29-04-2015, 05:01 AM
RE: UNIX Diary - by z3bra - 29-04-2015, 10:29 AM
RE: UNIX Diary - by xero - 29-04-2015, 03:09 PM
RE: UNIX Diary - by greduan - 02-05-2015, 09:58 AM
RE: UNIX Diary - by cjm - 07-05-2015, 11:14 AM
RE: UNIX Diary - by z3bra - 07-05-2015, 12:20 PM
RE: UNIX Diary - by neeasade - 24-07-2015, 11:10 PM
RE: UNIX Diary - by z3bra - 25-07-2015, 08:44 AM
RE: UNIX Diary - by Houseoftea - 25-07-2015, 11:32 PM
RE: UNIX Diary - by movq - 26-07-2015, 03:52 AM
RE: UNIX Diary - by z3bra - 27-07-2015, 02:02 PM
RE: UNIX Diary - by z3bra - 24-08-2015, 07:07 PM
RE: UNIX Diary - by xero - 25-08-2015, 10:38 AM
RE: UNIX Diary - by rocx - 30-08-2015, 11:40 PM
RE: UNIX Diary - by z3bra - 31-08-2015, 04:40 AM
RE: UNIX Diary - by venam - 31-08-2015, 07:30 AM
RE: UNIX Diary - by pranomostro - 03-09-2015, 05:34 PM
RE: UNIX Diary - by kirby - 03-09-2015, 06:57 PM
RE: UNIX Diary - by xero - 10-09-2015, 11:30 AM
RE: UNIX Diary - by venam - 14-09-2015, 03:45 AM
RE: UNIX Diary - by darthlukan - 14-09-2015, 02:53 PM
RE: UNIX Diary - by dkeg - 15-09-2015, 07:49 AM
RE: UNIX Diary - by darthlukan - 05-10-2015, 03:03 PM
RE: UNIX Diary - by pranomostro - 05-10-2015, 05:00 PM
RE: UNIX Diary - by apk - 06-10-2015, 02:41 PM
RE: UNIX Diary - by Mafia - 06-10-2015, 09:33 PM
RE: UNIX Diary - by kirby - 12-10-2015, 03:04 PM
RE: UNIX Diary - by pranomostro - 13-10-2015, 08:37 AM
RE: UNIX Diary - by venam - 13-10-2015, 09:38 AM
RE: UNIX Diary - by xero - 13-10-2015, 10:55 AM
RE: UNIX Diary - by pranomostro - 13-10-2015, 11:18 AM
RE: UNIX Diary - by venam - 15-10-2015, 01:34 PM
RE: UNIX Diary - by darthlukan - 15-10-2015, 04:44 PM
RE: UNIX Diary - by pranomostro - 15-10-2015, 06:05 PM
RE: UNIX Diary - by xero - 15-10-2015, 06:58 PM
RE: UNIX Diary - by darthlukan - 16-10-2015, 02:29 AM
RE: UNIX Diary - by pranomostro - 16-10-2015, 10:09 AM
RE: UNIX Diary - by darthlukan - 19-10-2015, 02:10 PM
RE: UNIX Diary - by venam - 20-10-2015, 02:05 AM
RE: UNIX Diary - by darthlukan - 20-10-2015, 02:28 AM
RE: UNIX Diary - by thetornainbow - 20-10-2015, 08:52 AM
RE: UNIX Diary - by Houseoftea - 20-10-2015, 09:11 AM
RE: UNIX Diary - by z3bra - 20-10-2015, 12:18 PM
RE: UNIX Diary - by darthlukan - 21-10-2015, 02:31 AM
RE: UNIX Diary - by z3bra - 30-11-2015, 07:08 PM
RE: UNIX Diary - by apk - 30-11-2015, 08:49 PM
RE: UNIX Diary - by z3bra - 01-12-2015, 08:24 AM
RE: UNIX Diary - by apk - 01-12-2015, 11:43 AM
RE: UNIX Diary - by arcetera - 02-12-2015, 08:57 PM
RE: UNIX Diary - by venam - 03-12-2015, 02:20 AM
RE: UNIX Diary - by pranomostro - 03-12-2015, 11:32 AM
RE: UNIX Diary - by dcat - 07-12-2015, 06:16 PM
RE: UNIX Diary - by venam - 11-12-2015, 07:30 AM
RE: UNIX Diary - by xero - 11-12-2015, 03:04 PM
RE: UNIX Diary - by pranomostro - 13-12-2015, 08:31 AM
RE: UNIX Diary - by venam - 13-12-2015, 03:22 PM
RE: UNIX Diary - by strang3quark - 13-12-2015, 03:57 PM
RE: UNIX Diary - by rocx - 13-12-2015, 04:37 PM
RE: UNIX Diary - by Wildefyr - 13-12-2015, 07:29 PM
RE: UNIX Diary - by venam - 14-12-2015, 01:37 AM
RE: UNIX Diary - by movq - 14-12-2015, 12:44 PM
RE: UNIX Diary - by venam - 14-12-2015, 12:56 PM
RE: UNIX Diary - by pranomostro - 14-12-2015, 01:24 PM
RE: UNIX Diary - by movq - 19-12-2015, 03:26 PM
RE: UNIX Diary - by venam - 20-12-2015, 05:02 AM
RE: UNIX Diary - by movq - 20-12-2015, 08:13 AM
RE: UNIX Diary - by pranomostro - 20-12-2015, 10:21 AM
RE: UNIX Diary - by z3bra - 20-12-2015, 03:46 PM
RE: UNIX Diary - by movq - 22-12-2015, 03:27 PM
RE: UNIX Diary - by XcelQ - 24-01-2016, 01:32 PM
RE: UNIX Diary - by pranomostro - 26-01-2016, 02:17 PM
RE: UNIX Diary - by XcelQ - 28-01-2016, 03:17 AM
RE: UNIX Diary - by rain1 - 19-04-2016, 08:28 AM
RE: UNIX Diary - by josuah - 22-04-2016, 05:45 PM
RE: UNIX Diary - by movq - 07-05-2016, 01:34 PM
RE: UNIX Diary - by rocx - 16-05-2016, 02:21 AM
RE: UNIX Diary - by venam - 10-06-2016, 01:11 AM
RE: UNIX Diary - by venam - 14-09-2016, 01:12 AM
RE: UNIX Diary - by xero - 14-09-2016, 11:36 AM
RE: UNIX Diary - by jkl - 14-09-2016, 11:58 AM
RE: UNIX Diary - by venam - 31-01-2017, 09:27 AM
RE: UNIX Diary - by rocx - 18-02-2017, 02:17 AM
RE: UNIX Diary - by fre d die - 15-03-2017, 06:13 PM
RE: UNIX Diary - by rocx - 15-03-2017, 07:07 PM
RE: UNIX Diary - by robotchaos - 07-04-2017, 02:13 AM
RE: UNIX Diary - by evbo - 08-04-2017, 03:00 AM
RE: UNIX Diary - by jkl - 08-04-2017, 08:30 AM
RE: UNIX Diary - by venam - 09-04-2017, 04:56 AM
RE: UNIX Diary - by robotchaos - 10-04-2017, 03:56 PM
RE: UNIX Diary - by jkl - 10-04-2017, 04:03 PM
RE: UNIX Diary - by robotchaos - 10-04-2017, 04:22 PM
RE: UNIX Diary - by jkl - 10-04-2017, 04:25 PM
RE: UNIX Diary - by josuah - 11-04-2017, 09:19 AM
RE: UNIX Diary - by jkl - 11-04-2017, 09:39 AM
RE: UNIX Diary - by evbo - 18-04-2017, 02:20 PM
RE: UNIX Diary - by robotchaos - 18-04-2017, 03:43 PM
RE: UNIX Diary - by nas - 12-06-2017, 09:33 AM
RE: UNIX Diary - by Tmplt - 12-07-2017, 02:00 AM
RE: UNIX Diary - by xero - 13-07-2017, 03:12 PM
RE: UNIX Diary - by venam - 20-10-2017, 03:12 AM
RE: UNIX Diary - by Houseoftea - 04-01-2018, 08:40 PM
RE: UNIX Diary - by rocx - 05-01-2018, 02:04 AM
RE: UNIX Diary - by Tmplt - 21-01-2018, 10:02 PM
RE: UNIX Diary - by jkl - 22-01-2018, 08:14 AM
RE: UNIX Diary - by Tmplt - 22-01-2018, 01:02 PM
RE: UNIX Diary - by mrtn - 22-01-2018, 04:47 PM
RE: UNIX Diary - by jkl - 22-01-2018, 04:53 PM
RE: UNIX Diary - by jkl - 31-03-2018, 09:22 PM
RE: UNIX Diary - by jkl - 15-05-2018, 12:17 PM
RE: UNIX Diary - by z3bra - 20-09-2018, 07:07 PM
RE: UNIX Diary - by xero - 25-10-2018, 01:27 PM
RE: UNIX Diary - by venam - 26-10-2018, 01:08 AM
RE: UNIX Diary - by Steph - 28-10-2018, 05:23 PM
RE: UNIX Diary - by rocx - 04-11-2018, 01:48 PM
RE: UNIX Diary - by jkl - 05-11-2018, 10:18 AM
RE: UNIX Diary - by pranomostro - 06-11-2018, 09:06 AM
RE: UNIX Diary - by anthk - 10-01-2019, 12:20 PM
RE: UNIX Diary - by pranomostro - 10-01-2019, 04:38 PM
RE: UNIX Diary - by gaak - 14-01-2019, 09:47 PM
RE: UNIX Diary - by josuah - 10-12-2019, 08:39 PM
RE: UNIX Diary - by z3bra - 15-05-2020, 12:19 PM
RE: UNIX Diary - by wolf - 18-06-2020, 04:52 PM
RE: UNIX Diary - by fre d die - 08-07-2020, 04:47 PM
RE: UNIX Diary - by seninha - 08-07-2020, 09:34 PM
RE: UNIX Diary - by movq - 28-09-2020, 03:19 PM
RE: UNIX Diary - by z3bra - 29-09-2020, 11:00 AM
RE: UNIX Diary - by jkl - 30-09-2020, 03:52 AM
RE: UNIX Diary - by movq - 28-05-2021, 03:18 PM
RE: UNIX Diary - by movq - 27-09-2021, 11:56 AM
RE: UNIX Diary - by venam - 17-12-2021, 03:49 PM
RE: UNIX Diary - by z3bra - 20-12-2021, 08:34 AM