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Groups > comp.arch.embedded > #27998
| From | Nils M Holm <nmh@ananda.local> |
|---|---|
| Newsgroups | comp.arch.embedded |
| Subject | Re: arm-gcc: pointer to constant string |
| Date | 2018-09-14 09:47 +0000 |
| Organization | TARFU |
| Message-ID | <g01ee7F9ruuU1@mid.individual.net> (permalink) |
| References | <pnfp7q$a7b$1@dont-email.me> |
pozz <pozzugno@gmail.com> wrote:
> --- 1.c ---
> void foo(void) {
> dummy("hello");
> }
>
> --- 2.c ---
> static const char *s;
>
> void dummy(const char *ss) {
> s = ss;
> }
>
>
> "hello" is a constant string declared inside function foo(). Is there a
> guarantee that his pointer (passed to dummy()) is valid after exiting
> foo()?
Yes. K&R II (The C Programming Language, 2nd Ed), says that
(A2.6) "A string has type 'array of characters' and storage class 'static'."
and
(A4) "Static objects [...] retain their values across exit from and reentry
to functions and blocks."
> In other words, is the string on the stack (in this case it will
> not be valid after foo()) or in Flash (so it is permanent)?
--
Nils M Holm < n m h @ t 3 x . o r g > www.t3x.org
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arm-gcc: pointer to constant string pozz <pozzugno@gmail.com> - 2018-09-14 09:50 +0200
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-14 11:18 +0200
Re: arm-gcc: pointer to constant string pozz <pozzugno@gmail.com> - 2018-09-14 13:05 +0200
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-14 13:25 +0200
Re: arm-gcc: pointer to constant string Nils M Holm <nmh@ananda.local> - 2018-09-14 09:47 +0000
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-14 12:26 +0200
Re: arm-gcc: pointer to constant string Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2018-09-14 14:52 +0200
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-14 16:04 +0200
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-14 15:48 +0100
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-14 17:02 +0200
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-14 18:45 +0100
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-14 20:37 +0200
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-14 20:51 +0100
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-15 16:24 +0200
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-15 17:28 +0100
Re: arm-gcc: pointer to constant string Clifford Heath <no.spam@please.net> - 2018-09-16 13:58 +1000
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-16 08:42 +0100
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-16 08:47 +0100
Re: arm-gcc: pointer to constant string Clifford Heath <no.spam@please.net> - 2018-09-16 20:18 +1000
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-16 12:25 +0100
Re: arm-gcc: pointer to constant string Clifford Heath <no.spam@please.net> - 2018-09-16 22:22 +1000
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-16 15:00 +0200
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-16 14:33 +0100
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-16 22:06 +0200
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-16 21:42 +0100
Re: arm-gcc: pointer to constant string Les Cargill <lcargill99@comcast.com> - 2018-09-17 21:24 -0500
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-18 08:49 +0200
Re: arm-gcc: pointer to constant string Les Cargill <lcargill99@comcast.com> - 2018-09-21 22:15 -0500
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-22 11:53 +0200
Testing (Was: arm-gcc: pointer to constant string) Jacob Sparre Andersen <jacob@jacob-sparre.dk> - 2018-09-22 12:16 +0200
Re: Testing (Was: arm-gcc: pointer to constant string) David Brown <david.brown@hesbynett.no> - 2018-09-22 13:31 +0200
Re: Testing (Was: arm-gcc: pointer to constant string) Clifford Heath <no.spam@please.net> - 2018-09-23 09:26 +1000
Re: arm-gcc: pointer to constant string Niklas Holsti <niklas.holsti@tidorum.invalid> - 2018-09-22 20:06 +0300
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-23 14:39 +0200
Re: arm-gcc: pointer to constant string Les Cargill <lcargill99@comcast.com> - 2018-09-22 13:50 -0500
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-23 15:21 +0200
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-23 16:06 +0100
Re: arm-gcc: pointer to constant string julio@diegidio.name - 2018-09-23 08:41 -0700
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-23 16:49 +0100
Re: arm-gcc: pointer to constant string julio@diegidio.name - 2018-09-23 08:56 -0700
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-23 18:20 +0100
Re: arm-gcc: pointer to constant string julio@diegidio.name - 2018-09-23 12:05 -0700
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-23 20:50 +0100
Re: arm-gcc: pointer to constant string Les Cargill <lcargill99@comcast.com> - 2018-09-23 12:04 -0500
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-23 18:27 +0100
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-23 19:37 +0200
Re: arm-gcc: pointer to constant string Jacob Sparre Andersen <jacob@jacob-sparre.dk> - 2018-09-24 12:53 +0200
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-24 13:49 +0200
Re: arm-gcc: pointer to constant string Les Cargill <lcargill99@comcast.com> - 2018-09-28 20:17 -0500
Re: arm-gcc: pointer to constant string Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-09-18 08:32 +0100
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-18 10:02 +0200
Re: arm-gcc: pointer to constant string Les Cargill <lcargill99@comcast.com> - 2018-09-21 22:17 -0500
Re: arm-gcc: pointer to constant string Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2018-09-14 18:30 +0200
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-14 20:46 +0200
Re: arm-gcc: pointer to constant string Stefan Reuther <stefan.news@arcor.de> - 2018-09-14 19:57 +0200
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-14 20:56 +0200
Re: arm-gcc: pointer to constant string Stefan Reuther <stefan.news@arcor.de> - 2018-09-15 18:32 +0200
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-16 15:06 +0200
Re: arm-gcc: pointer to constant string Richard Damon <Richard@Damon-Family.org> - 2018-09-14 19:59 -0400
Re: arm-gcc: pointer to constant string David Brown <david.brown@hesbynett.no> - 2018-09-15 16:25 +0200
Re: arm-gcc: pointer to constant string Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2018-09-14 13:49 +0300
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