From: Jane Liang <JLiang@lgc.com>
To: "'Ben Davis'" <bnd25@cam.ac.uk>, Jane Liang <JLiang@lgc.com>,
"'GCC-help'" <gcc-help@gcc.gnu.org>
Subject: RE: Help wanted
Date: Mon, 17 Mar 2003 19:16:00 -0000 [thread overview]
Message-ID: <57A168CAC1B2A6409978DF309F6FDB39C4EB16@lgchexch008.ad.lgc.com> (raw)
Hi, Ben:
It works!
Thanks!
Jane
-----Original Message-----
From: Ben Davis [mailto:bnd25@cam.ac.uk]
Sent: Monday, March 17, 2003 10:54 AM
To: Jane Liang; 'GCC-help'
Subject: Re: Help wanted
On Monday 17 March 2003 4:26 pm, Jane Liang wrote:
> Line 8 char *str = "0.12000, 0.0, 0.0";
This is a constant string, so it is stored in read-only memory.
> Line 13 *ptr = '\0';
You are now writing to read-only memory. Hence the crash.
You can fix your code by making 'str' an array instead:
char str[] = "0.12000, 0.0, 0.0";
Then the string will be stored temporarily on the stack, which is writable.
The array will be just the right size to accommodate the string.
When using GCC, I recommend you compile with -Wwrite-strings. String
constants
will then be given the 'const' qualifier, and you will get a warning if you
don't use 'const' yourself where necessary:
const char *str = "0.12000, 0.0, 0.0";
Ben
next reply other threads:[~2003-03-17 16:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-17 19:16 Jane Liang [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-03-17 16:44 Jane Liang
2003-03-17 16:53 ` Ben Davis
2002-08-12 8:22 help wanted rojesh p
2001-10-10 22:06 Danish Samad
2001-10-10 23:44 ` Rupert Wood
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