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Groups > comp.lang.c > #101567
| From | Richard Heathfield <rjh@cpax.org.uk> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Correct way of doing string manipulation functions |
| Date | 2017-01-13 00:59 +0000 |
| Organization | Fix this later |
| Message-ID | <o598nh$3ue$1@dont-email.me> (permalink) |
| References | (1 earlier) <1414fce8-8d42-4ced-8289-2eaca032baef@googlegroups.com> <dnde7ct48a26n0520l31tbu0qtdk1nu4nh@4ax.com> <fa5bae86-24a8-43fa-b6b0-fb4ce7a826b1@googlegroups.com> <fe768196-91cb-4db1-a094-c548a709b64d@googlegroups.com> <d16bb2a3-d00e-4f02-b1ea-4f5faa11197e@googlegroups.com> |
On 13/01/17 00:50, Malcolm McLean wrote:
> On Thursday, January 12, 2017 at 5:32:54 PM UTC, Fernando D. Bozzo wrote:
>>
>> You did make me think that, because a string have their characters
>> always stored in consecutively addresses, then should not be any
>> problem in starting in the middle of that string, and in the case
>> of needing to copy from another part of the string I suppose that
>> I can use the other one, strncpy(), indicating the length to copy.
>>
>> Wonderful, thanks.-
>>
> As a general rule, C string should be treated as atomic.
Whose rule? Is this another Malcolm-only rule?
> Taking
> a suffix of another string and treating it as a whole string is
> something to avoid, except in low level leaf functions.
Why? (Oh, okay, you're getting to that...)
> The reasons are firstly to avoid creating unaligned pointers,
Huh? Consider:
#include <stdio.h>
int main(void)
{
const char hw[] = "Hello, World.";
const char *s = hw + 7;
printf("%s\n", s);
return 0;
}
Would you say that s is "unaligned"? If so, what do you mean by that?
> secondly and relatedly to help interfacing with code written in
> other languages,
Which specific languages did you have in mind, and how precisely does
substring access interfere with C's interface to these languages?
> and thirdly because the structure of the program
> can quickly become a mess if pointers point into objects, maybe
> even overlapping.
I would certainly agree that one should always take great care with
pointers, and one should always be sure of where they point, and why,
and for how long they should point there, but I see no reason to impose
a blanket ban on pointers to string suffixes.
--
Richard Heathfield
Email: rjh at cpax dot org dot uk
"Usenet is a strange place" - dmr 29 July 1999
Sig line 4 vacant - apply within
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Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-10 15:43 -0800
Re: Correct way of doing string manipulation functions "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-10 19:36 -0500
Re: Correct way of doing string manipulation functions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-11 03:41 +0000
Re: Correct way of doing string manipulation functions James Kuyper <jameskuyper@verizon.net> - 2017-01-11 07:19 -0500
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-11 14:36 -0800
Correct way of doing string manipulation functions "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-01-10 16:41 -0800
Re: Correct way of doing string manipulation functions "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-01-10 16:54 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-11 14:38 -0800
Re: Correct way of doing string manipulation functions "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-01-11 18:24 -0800
Re: Correct way of doing string manipulation functions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-11 03:38 +0000
Re: Correct way of doing string manipulation functions "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-01-10 20:02 -0800
Re: Correct way of doing string manipulation functions "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-01-10 20:28 -0800
Re: Correct way of doing string manipulation functions Ian Collins <ian-news@hotmail.com> - 2017-01-11 18:19 +1300
Re: Correct way of doing string manipulation functions "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-01-11 02:40 -0800
Re: Correct way of doing string manipulation functions "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-01-10 20:18 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-11 14:37 -0800
Re: Correct way of doing string manipulation functions "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-01-11 18:23 -0800
Re: Correct way of doing string manipulation functions BartC <bc@freeuk.com> - 2017-01-11 01:12 +0000
Re: Correct way of doing string manipulation functions BartC <bc@freeuk.com> - 2017-01-11 11:59 +0000
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-11 14:39 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-10 17:55 -0800
Re: Correct way of doing string manipulation functions "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-01-10 18:21 -0800
Re: Correct way of doing string manipulation functions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-11 03:21 +0000
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-11 07:33 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-11 07:43 -0800
Re: Correct way of doing string manipulation functions BartC <bc@freeuk.com> - 2017-01-11 15:50 +0000
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-11 08:07 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-11 14:46 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-12 03:04 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-12 03:37 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-12 05:47 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-12 06:14 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-12 06:34 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-12 07:38 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-12 07:59 -0800
Re: Correct way of doing string manipulation functions Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-14 22:24 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-15 03:30 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-15 03:52 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-15 04:23 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-11 14:42 -0800
Re: Correct way of doing string manipulation functions Keith Thompson <kst-u@mib.org> - 2017-01-10 19:19 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-11 14:40 -0800
Re: Correct way of doing string manipulation functions Barry Schwarz <schwarzb@dqel.com> - 2017-01-10 20:31 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-11 14:45 -0800
Re: Correct way of doing string manipulation functions Gareth Owen <gwowen@gmail.com> - 2017-01-11 17:20 +0000
Re: Correct way of doing string manipulation functions "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-11 12:38 -0500
Strings as first class citizens (Was: Correct way of doing string manipulation functions) gazelle@shell.xmission.com (Kenny McCormack) - 2017-01-11 17:53 +0000
Re: Strings as first class citizens (Was: Correct way of doing string manipulation functions) Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-11 12:46 -0800
Re: Strings as first class citizens (Was: Correct way of doing string manipulation functions) fir <profesor.fir@gmail.com> - 2017-01-11 14:40 -0800
Re: Strings as first class citizens (Was: Correct way of doing string manipulation functions) Robert Wessel <robertwessel2@yahoo.com> - 2017-01-11 18:12 -0600
Re: Correct way of doing string manipulation functions supercat@casperkitty.com - 2017-01-11 09:56 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-11 14:48 -0800
Re: Correct way of doing string manipulation functions Thiago Adams <thiago.adams@gmail.com> - 2017-01-11 12:09 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-11 15:00 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-11 15:11 -0800
Re: Correct way of doing string manipulation functions "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-11 19:03 -0500
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-12 02:46 -0800
Re: Correct way of doing string manipulation functions Barry Schwarz <schwarzb@dqel.com> - 2017-01-12 00:08 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-12 03:02 -0800
Re: Correct way of doing string manipulation functions Richard Heathfield <rjh@cpax.org.uk> - 2017-01-12 11:38 +0000
Re: Correct way of doing string manipulation functions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-12 13:51 +0000
Re: Correct way of doing string manipulation functions Richard Heathfield <rjh@cpax.org.uk> - 2017-01-12 14:41 +0000
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-12 09:32 -0800
Re: Correct way of doing string manipulation functions Richard Heathfield <rjh@cpax.org.uk> - 2017-01-12 18:15 +0000
Re: Correct way of doing string manipulation functions Keith Thompson <kst-u@mib.org> - 2017-01-12 11:46 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-12 13:52 -0800
Re: Correct way of doing string manipulation functions Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-12 16:50 -0800
Re: Correct way of doing string manipulation functions Richard Heathfield <rjh@cpax.org.uk> - 2017-01-13 00:59 +0000
Re: Correct way of doing string manipulation functions raltbos@xs4all.nl (Richard Bos) - 2017-01-13 08:59 +0000
Re: Correct way of doing string manipulation functions Richard Heathfield <rjh@cpax.org.uk> - 2017-01-13 13:07 +0000
Re: Correct way of doing string manipulation functions Keith Thompson <kst-u@mib.org> - 2017-01-13 10:11 -0800
Re: Correct way of doing string manipulation functions BartC <bc@freeuk.com> - 2017-01-13 18:49 +0000
Re: Correct way of doing string manipulation functions supercat@casperkitty.com - 2017-01-13 08:43 -0800
Re: Correct way of doing string manipulation functions Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-13 09:45 -0800
Re: Correct way of doing string manipulation functions Richard Heathfield <rjh@cpax.org.uk> - 2017-01-13 18:17 +0000
Re: Correct way of doing string manipulation functions Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-13 10:30 -0800
Re: Correct way of doing string manipulation functions Richard Heathfield <rjh@cpax.org.uk> - 2017-01-13 18:48 +0000
Re: Correct way of doing string manipulation functions supercat@casperkitty.com - 2017-01-13 11:02 -0800
Re: Correct way of doing string manipulation functions Richard Heathfield <rjh@cpax.org.uk> - 2017-01-13 19:15 +0000
Re: Correct way of doing string manipulation functions supercat@casperkitty.com - 2017-01-13 12:18 -0800
Re: Correct way of doing string manipulation functions Keith Thompson <kst-u@mib.org> - 2017-01-13 12:14 -0800
Re: Correct way of doing string manipulation functions supercat@casperkitty.com - 2017-01-13 12:49 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-13 13:19 -0800
Re: Correct way of doing string manipulation functions supercat@casperkitty.com - 2017-01-13 10:46 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-13 11:55 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-13 10:41 -0800
Re: Correct way of doing string manipulation functions supercat@casperkitty.com - 2017-01-13 10:51 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-13 12:28 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-13 13:07 -0800
Re: Correct way of doing string manipulation functions supercat@casperkitty.com - 2017-01-13 13:29 -0800
Re: Correct way of doing string manipulation functions BartC <bc@freeuk.com> - 2017-01-13 21:45 +0000
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-13 13:59 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-13 15:08 -0800
Re: Correct way of doing string manipulation functions supercat@casperkitty.com - 2017-01-13 14:13 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-13 13:47 -0800
Re: Correct way of doing string manipulation functions fir <profesor.fir@gmail.com> - 2017-01-13 08:02 -0800
Re: Correct way of doing string manipulation functions supercat@casperkitty.com - 2017-01-12 07:50 -0800
Re: Correct way of doing string manipulation functions Keith Thompson <kst-u@mib.org> - 2017-01-12 08:37 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-12 09:41 -0800
Re: Correct way of doing string manipulation functions Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-13 17:39 -0800
Re: Correct way of doing string manipulation functions "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-13 18:02 -0800
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