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Top Forums Programming how to avoid the segfault from Address 0x1cd00000103 out of bounds Post 302277358 by cdbug on Friday 16th of January 2009 04:38:00 AM
Old 01-16-2009
They are pointers. This is sure. But there is some mistakes in the code I gave before. The assignment should use * before the pointers. I am sorry for carelessness when posted. But when checking with 'while ( *( tr->root->is_done ) )', the same segfault happen. And corresponding pinter address still be 'out of bounds". In my code, such statements exist.

This is a package coded by a previous member. He habits to use such structure for varialbes which control execution. A large package means that it is not easy to change all the strutures of this kind.

What's more, I think this is really a topic worth discusssion.



Quote:
Originally Posted by otheus
"out of bounds" means "invalid memory address". You avoid it by properly mallocing memory before using it.

I hate to say this, but you seem very confused about pointers. I think you need to read a very concise summary on C pointers.

In the code you provide, you are trying to assign values to the address...
Code:
node->des = 0;

You should instead be doing:
Code:
*(node->des) = 0;
 
This correction is good. I losed stars when posted.

And your loop should be:
Code:
while ( *(  tr->root->is_done ) ) {
... 
}
 
At this situation, segfaults still happen

Also, root itself is a pointer. So you first need to allocate it:
Code:
tr->root = malloc(sizeof(struct node_t));
tr->root->hood = malloc(sizeof(double*));

"tr" is also a pointer, and this needs to be allocated too, but I have no idea what kind of structure it is.


Also, this structure is very unusual. I cannot imagine why you want every element to be a pointer to something!
 

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Qpsmtpd::Address(3pm)					User Contributed Perl Documentation				     Qpsmtpd::Address(3pm)

NAME
Qpsmtpd::Address - Lightweight E-Mail address objects DESCRIPTION
Based originally on cut and paste from Mail::Address and including every jot and tittle from RFC-2821/2822 on what is a legal e-mail address for use during the SMTP transaction. USAGE
my $rcpt = Qpsmtpd::Address->new('<email.address@example.com>'); The objects created can be used as is, since they automatically stringify to a standard form, and they have an overloaded comparison for easy testing of values. METHODS
new() Can be called two ways: o Qpsmtpd::Address->new('<full_address@example.com>') The normal mode of operation is to pass the entire contents of the RCPT TO: command from the SMTP transaction. The value will be fully parsed via the canonify method, using the full RFC 2821 rules. o Qpsmtpd::Address->new("user", "host") If the caller has already split the address from the domain/host, this mode will not canonify the input values. This is not recommended in cases of user-generated input for that reason. This can be used to generate Qpsmtpd::Address objects for accounts like "<postmaster>" or indeed for the bounce address "<>". The resulting objects can be stored in arrays or used in plugins to test for equality (like in badmailfrom). canonify() Primarily an internal method, it is used only on the path portion of an e-mail message, as defined in RFC-2821 (this is the part inside the angle brackets and does not include the "human readable" portion of an address). It returns a list of (local-part, domain). parse() Retained as a compatibility method, it is completely equivalent to new() called with a single parameter. address() Can be used to reset the value of an existing Q::A object, in which case it takes a parameter with or without the angle brackets. Returns the stringified representation of the address. NOTE: does not escape any of the characters that need escaping, nor does it include the surrounding angle brackets. For that purpose, see format. format() Returns the canonical stringified representation of the address. It does escape any characters requiring it (per RFC-2821/2822) and it does include the surrounding angle brackets. It is also the default stringification operator, so the following are equivalent: print $rcpt->format(); print $rcpt; user([$user]) Returns the "localpart" of the address, per RFC-2821, or the portion before the '@' sign. If called with one parameter, the localpart is set and the new value is returned. host([$host]) Returns the "domain" part of the address, per RFC-2821, or the portion after the '@' sign. If called with one parameter, the domain is set and the new value is returned. notes($key[,$value]) Get or set a note on the address. This is a piece of data that you wish to attach to the address and read somewhere else. For example you can use this to pass data between plugins. COPYRIGHT
Copyright 2004-2005 Peter J. Holzer. See the LICENSE file for more information. perl v5.14.2 2009-04-02 Qpsmtpd::Address(3pm)
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