I have to write a C program using sys call (read, no fread) to read from shell all the parameters, without know how many are them.
I tryed in some ways, but I have no success.
Any Idea?
Can I use read to read from stdin? (1 Reply)
Hi,
Currently I am coding up a nasty way of reading file input using *cat* rather than *read*. My text input looks like
TextA 100
TextB 110
TextC 120
Currently I am using cat |while read line to read the first column and second column fields.
cat foo.txt|while read line
do
... (1 Reply)
Hi all,
I would like to simply read a file which lists a number of pathnames and files, then search and replace key strings using a few vi commands:
:1,$s/search_str/replace_str/g<return>
but I am not sure how to automate the <return> of these vis commands when I am putting this in a... (8 Replies)
Hello all, I am i am trying to read username password. Bassicaly, i have file called sidlist and it has my database name, username and password....
looks something like this....
db1, user1, pass1
db2, user2, pass2
db3, user3, pass4
but i dont know how to make it work, until i get... (4 Replies)
Hi
I am new to writing script and want to use a Bash Piped while-read and read from user input.
if something happens on server.log then do while loop or if something happend on user input then do while loop.
Pseudocode something like:
tail -n 3 -f server.log | while read serverline || read... (8 Replies)
Hi,
I have a variable which stores file names as a result of find command. I need to delete all these files one by one, i.e. by a loop. Can anyone tell me how can it be done?
The variable f2d has the file names like these
abc.txt
bcd.txt
fff.txt
gef.txt
Now I have used a loop as... (12 Replies)
I am developing a script where 3 other scripts are included.
This is a graph related script.
COMPLETE IDEA:
-There are 3 different graph scripts. I would like to create a master graph with all 3 in one.
-User chooses the type of graph
-User is asked to enter the required auguments (... (7 Replies)
the scenario is -
If I pass 3 three arguments( run time) , it should list all .txt files from a path to temp file
if I pass 2 arguments ( run time) , it should list all .csv files from the same path to another temp file
the above scenario should be handled in single code and also I dont know ... (2 Replies)
Hello All,
I have a file like below....
dn: cn=user1,ou=org,o=org
cn=user1
uid=user1
cn=user2,ou=org,o=org
cn=user2
uid=user2
cn=user3,ou=org,o=org
cn=user3
cn=user33
uid=user3
cn=user4,ou=org,o=org
cn=user4
uid=user4 (6 Replies)
How to read multiple files at simultaneously? (1 Reply)
Discussion started by: Priyanka_M
1 Replies
LEARN ABOUT CENTOS
xml::libxml::devel
XML::LibXML::Devel(3) User Contributed Perl Documentation XML::LibXML::Devel(3)NAME
XML::LibXML::Devel - makes functions from LibXML.xs available
SYNOPSIS
/**********************************************
* C functions you want to access
*/
xmlNode *return_node();
void receive_node(xmlNode *);
###############################################
# XS Code
void *
xs_return_node
CODE:
RETVAL = return_node();
OUTPUT:
RETVAL
void
xs_receive_node
void *n
CODE:
receive_node(n);
###############################################
# Perl code
use XML::LibXML::Devel;
sub return_node
{
my $raw_node = xs_return_node();
my $node = XML::LibXML::Devel::node_to_perl($raw_node);
XML::LibXML::Devel::refcnt_inc($raw_node);
return $node;
}
sub receive_node
{
my ($node) = @_;
my $raw_node = XML::LibXML::Devel::node_from_perl($node);
xs_receive_node($raw_node);
XML::LibXML::Devel::refcnt_inc($raw_node);
}
DESCRIPTION
"XML::LibXML::Devel" makes functions from LibXML.xs available that are needed to wrap libxml2 nodes in and out of XML::LibXML::Nodes. This
gives cleaner dependencies than using LibXML.so directly.
To XS a library that uses libxml2 nodes the first step is to do this so that xmlNodePtr is passed as void *. These raw nodes are then
turned into libxml nodes by using this "Devel" functions.
Be aware that this module is currently rather experimental. The function names may change if I XS more functions and introduce a reasonable
naming convention.
Be also aware that this module is a great tool to cause segfaults and introduce memory leaks. It does however provide a partial cure by
making "xmlMemUsed" available as "mem_used".
FUNCTIONS
NODE MANAGEMENT
node_to_perl
node_to_perl($raw_node);
Returns a LibXML::Node object. This has a proxy node with a reference counter and an owner attached. The raw node will be deleted as soon
as the reference counter reaches zero. If the C library is keeping a pointer to the raw node, you need to call refcnt_inc immediately.
You also need to replace xmlFreeNode by a call to refcnt_dec.
node_to_perl
node_from_perl($node);
Returns a raw node. This is a void * pointer and you can do nothing but passing it to functions that treat it as an xmlNodePtr. The raw
node will be freed as soon as its reference counter reaches zero. If the C library is keeping a pointer to the raw node, you need to call
refcnt_inc immediately. You also need to replace xmlFreeNode by a call to refcnt_dec.
refcnt_inc
refcnt_inc($raw_node);
Increments the raw nodes reference counter. The raw node must already be known to perl to have a reference counter.
refcnt_dec
refcnt_dec($raw_node);
Decrements the raw nodes reference counter and returns the value it had before. if the counter becomes zero or less, this method will free
the proxy node holding the reference counter. If the node is part of a subtree, refcnt_dec will fix the reference counts and delete the
subtree if it is not required any more.
refcnt
refcnt($raw_node);
Returns the value of the reference counter.
fix_owner
fix_owner($raw_node, $raw_parent);
This functions fixes the reference counts for an entire subtree. it is very important to fix an entire subtree after node operations
where the documents or the owner node may get changed. this method is aware about nodes that already belong to a certain owner node.
MEMORY DEBUGGING
$ENV{DEBUG_MEMORY}
BEGIN {$ENV{DEBUG_MEMORY} = 1;};
use XML::LibXML;
This turns on libxml2 memory debugging. It must be set before XML::LibXML is loaded.
mem_used
mem_used();
Returns the number of bytes currently allocated.
EXPORT
None by default.
SEE ALSO
This was created to support the needs of Apache2::ModXml2. So this can serve as an example.
AUTHOR
Joachim Zobel <jz-2011@heute-morgen.de>
COPYRIGHT AND LICENSE
Copyright (C) 2011 by Joachim Zobel
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.1 or,
at your option, any later version of Perl 5 you may have available.
perl v5.16.3 2013-05-13 XML::LibXML::Devel(3)