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| From | David Brown <david.brown@hesbynett.no> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Counted strings |
| Date | 2016-12-05 22:07 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <o24kst$ar$1@dont-email.me> (permalink) |
| References | (9 earlier) <o23vu2$eaq$1@dont-email.me> <7520b145-f095-473c-a117-d89ef8feb590@googlegroups.com> <o244gj$9l$1@dont-email.me> <949ba4ee-4184-4cf0-954a-cfb77bc09553@googlegroups.com> <o2487j$f4c$1@dont-email.me> |
On 05/12/16 18:31, BartC wrote:
> On 05/12/2016 16:36, supercat@casperkitty.com wrote:
>> On Monday, December 5, 2016 at 10:28:31 AM UTC-6, Bart wrote:
>>> void appendchar(Cstr* S, char c){
>>>
>>> if (S->length==0) {
>>> S->length=1;
>>> S->str=malloc(2);
>>> *(S->str)=c;
>>> *(S->str+1)=0;
>>> }
>>> else {
>>> ++S->length;
>>> S->str=realloc(S->str,S->length+1);
>>> *(S->str+S->length-1)=c;
>>> *(S->str+S->length)=0;
>>> }
>>> }
>>
>> This code hints at a big reason why I suggested that strings should keep
>> track of both buffer size and string length. If those are tracked
>> separately and code needs to expand a string, it can expand it to either
>> the required size or some multiple (possibly fractional) of its previous
>> length (e.g. 1.25x, 1.5x or 2x).
>
> Presumably malloc/realloc don't do any over-allocation of their own (not
> significant anyway apart perhaps from rounding).
>
It is not uncommon for malloc to over-allocate to keep everything
aligned to cache line sizes. But you don't get easy access to that
extra memory - keeping the buffer size independent from the string
length is the only way to go.
> This is why I normally have to wrap extra memory management around
> malloc (I don't use realloc much).
>
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Counted strings jacobnavia <jacob@jacob.remcomp.fr> - 2016-12-03 23:58 +0100
Re: Counted strings supercat@casperkitty.com - 2016-12-03 15:40 -0800
Counted stringsl Thiago Adams <thiago.adams@gmail.com> - 2016-12-03 15:40 -0800
Re: Counted strings BartC <bc@freeuk.com> - 2016-12-04 00:20 +0000
Re: Counted strings Richard Damon <Richard@Damon-Family.org> - 2016-12-03 21:26 -0500
Re: Counted strings jacobnavia <jacob@jacob.remcomp.fr> - 2016-12-04 18:11 +0100
Re: Counted strings Mark Storkamp <mstorkamp@yahoo.com> - 2016-12-04 19:25 -0600
Re: Counted strings Keith Thompson <kst-u@mib.org> - 2016-12-03 18:57 -0800
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-04 16:33 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-04 07:52 -0800
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-04 17:10 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-04 10:14 -0800
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-04 20:20 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-04 16:49 -0800
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-05 10:40 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 05:51 -0800
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-05 16:10 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 07:38 -0800
Re: Counted strings Melzzzzz <mel@zzzzz.com> - 2016-12-05 16:56 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 08:04 -0800
Re: Counted strings Melzzzzz <mel@zzzzz.com> - 2016-12-05 17:16 +0100
Re: Counted strings Jerry Stuckle <jstucklex@attglobal.net> - 2016-12-05 16:12 -0500
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 13:24 -0800
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-06 10:53 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-06 03:52 -0800
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-06 13:32 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-06 04:48 -0800
Re: Counted strings Robert Spanjaard <spamtrap@arumes.com> - 2016-12-06 13:42 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-06 05:16 -0800
Re: Counted strings Robert Spanjaard <spamtrap@arumes.com> - 2016-12-06 14:39 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-06 05:24 -0800
Re: Counted strings fir <profesor.fir@gmail.com> - 2016-12-06 05:41 -0800
Re: Counted strings fir <profesor.fir@gmail.com> - 2016-12-06 05:47 -0800
Re: Counted strings Robert Spanjaard <spamtrap@arumes.com> - 2016-12-06 14:48 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-06 05:54 -0800
Re: Counted strings fir <profesor.fir@gmail.com> - 2016-12-06 06:21 -0800
Re: Counted strings fir <profesor.fir@gmail.com> - 2016-12-06 06:24 -0800
Re: Counted strings Robert Spanjaard <spamtrap@arumes.com> - 2016-12-06 18:06 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-06 10:19 -0800
Re: Counted strings Robert Spanjaard <spamtrap@arumes.com> - 2016-12-06 19:45 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-06 11:10 -0800
Re: Counted strings fir <profesor.fir@gmail.com> - 2016-12-06 12:58 -0800
Re: Counted strings fir <profesor.fir@gmail.com> - 2016-12-06 14:08 -0800
Re: Counted strings Keith Thompson <kst-u@mib.org> - 2016-12-06 11:25 -0800
Re: Counted strings fir <profesor.fir@gmail.com> - 2016-12-06 05:28 -0800
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-06 16:21 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-06 07:29 -0800
Re: Counted strings fir <profesor.fir@gmail.com> - 2016-12-06 07:39 -0800
Re: Counted strings fir <profesor.fir@gmail.com> - 2016-12-06 08:32 -0800
Re: Counted strings fir <profesor.fir@gmail.com> - 2016-12-06 08:32 -0800
Re: Counted strings BartC <bc@freeuk.com> - 2016-12-05 16:28 +0000
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 08:34 -0800
Re: Counted strings BartC <bc@freeuk.com> - 2016-12-05 18:27 +0000
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 10:36 -0800
Re: Counted strings Ian Collins <ian-news@hotmail.com> - 2016-12-06 08:19 +1300
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 11:22 -0800
Re: Counted strings Ian Collins <ian-news@hotmail.com> - 2016-12-06 08:26 +1300
Re: Counted strings BartC <bc@freeuk.com> - 2016-12-05 19:36 +0000
Re: Counted strings Ian Collins <ian-news@hotmail.com> - 2016-12-06 08:41 +1300
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 11:48 -0800
Re: Counted strings Thiago Adams <thiago.adams@gmail.com> - 2016-12-05 11:59 -0800
Re: Counted strings jameskuyper@verizon.net - 2016-12-05 12:12 -0800
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 12:18 -0800
Re: Counted strings jameskuyper@verizon.net - 2016-12-05 13:17 -0800
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 13:29 -0800
Re: Counted strings jameskuyper@verizon.net - 2016-12-05 15:37 -0800
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 15:43 -0800
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-06 13:40 +0100
Re: Counted strings "James R. Kuyper" <jameskuyper@verizon.net> - 2016-12-06 12:00 -0500
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-06 10:09 -0800
Re: Counted strings Jerry Stuckle <jstucklex@attglobal.net> - 2016-12-06 13:33 -0500
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-06 21:24 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-06 12:56 -0800
Re: Counted strings Keith Thompson <kst-u@mib.org> - 2016-12-05 12:22 -0800
Re: Counted strings supercat@casperkitty.com - 2016-12-05 08:36 -0800
Re: Counted strings BartC <bc@freeuk.com> - 2016-12-05 17:31 +0000
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-05 22:07 +0100
Re: Counted strings Ian Collins <ian-news@hotmail.com> - 2016-12-06 10:14 +1300
Re: Counted strings Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-05 22:11 +0000
Re: Counted strings BartC <bc@freeuk.com> - 2016-12-06 02:13 +0000
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-05 21:57 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 13:01 -0800
Re: Counted strings BartC <bc@freeuk.com> - 2016-12-05 21:22 +0000
Re: Counted strings Ian Collins <ian-news@hotmail.com> - 2016-12-06 10:25 +1300
Re: Counted strings BartC <bc@freeuk.com> - 2016-12-05 21:36 +0000
Re: Counted strings jacobnavia <jacob@jacob.remcomp.fr> - 2016-12-05 22:33 +0100
Re: Counted strings "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-05 17:03 -0500
Re: Counted strings supercat@casperkitty.com - 2016-12-04 08:57 -0800
Re: Counted strings Robert Spanjaard <spamtrap@arumes.com> - 2016-12-04 20:19 +0100
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-04 20:24 +0100
Re: Counted strings Robert Spanjaard <spamtrap@arumes.com> - 2016-12-04 20:37 +0100
Re: Counted strings David Brown <david.brown@hesbynett.no> - 2016-12-04 21:04 +0100
Re: Counted strings Robert Spanjaard <spamtrap@arumes.com> - 2016-12-04 21:22 +0100
Re: Counted strings BartC <bc@freeuk.com> - 2016-12-04 22:37 +0000
Re: Counted strings David Thompson <dave.thompson2@verizon.net> - 2016-12-10 22:42 -0500
Re: Counted strings Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-10 23:17 -0800
Re: Counted strings Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-11 11:48 +0000
Re: Counted strings Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-11 04:40 -0800
Re: Counted strings Robert Spanjaard <spamtrap@arumes.com> - 2016-12-11 10:56 +0100
Re: Counted strings Robert Wessel <robertwessel2@yahoo.com> - 2016-12-05 15:47 -0600
Re: Counted strings Gareth Owen <gwowen@gmail.com> - 2016-12-05 22:01 +0000
Re: Counted strings Robert Wessel <robertwessel2@yahoo.com> - 2016-12-05 22:28 -0600
Re: Counted strings "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-12-05 20:18 -0800
Re: Counted strings Robert Spanjaard <spamtrap@arumes.com> - 2016-12-06 11:05 +0100
Re: Counted strings luser droog <luser.droog@gmail.com> - 2016-12-04 13:13 -0800
Re: Counted strings Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-05 09:30 -0800
Re: Counted strings Keith Thompson <kst-u@mib.org> - 2016-12-05 09:41 -0800
Re: Counted strings Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-06 11:19 -0800
Re: Counted strings Keith Thompson <kst-u@mib.org> - 2016-12-06 11:44 -0800
Re: Counted strings Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-10 10:29 -0800
Re: Counted strings supercat@casperkitty.com - 2016-12-10 11:08 -0800
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