Programming :: Best Way To Flush A Character Array

Aug 2, 2010

I believe I have unwanted ' characters left in a 9 element character array that are causing subsequent operations with it to fail. I see wildly differing views on the web on the proper way to flush 'em. It's clearly not as simple as it would appear at first sight. What's currently the best (or else "least deprecated") method?

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Programming :: Convert String Array To Character?

Aug 18, 2010

i have problem in java. how to convert string array to character. e.g string a[]={"ab","abc","abd","ag"}; what will be the character array ?

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Programming :: Structure Pointing To Character Array

Aug 9, 2010

I am currently writing a program using raw sockets. This program is used to send out ARP reply frames. The problem that I have is that I do not seem to be able to fill out a structure that is pointing to part of a character array.

Code:
struct eth_header *eth;
struct arp_header *arp;
char buf[8];
eth = (struct eth_header *)buf;
arp = (struct arp_header *)(buf+sizeof(struct arp_header));

Whilst I can fill out the variables of eth, I cannot fill out the variables of arp. If I fill them out and then send the contents of the array using send to, only the first structure (the ethernet header) is sent out. The rest of the data appears to be the original junk data in the array. I have checked the address of the structure pointer and it is pointing to the right place in the array. If I write a raw sockets program that uses an IP header struct and TCP header struct I can point these into the array and write to both of them without any issues.

The difference here is that the call to socket is different:
Code:
/* For ethernet */
fd = socket(AF_INET, SOCK_PACKET, htons(ETH_P_ARP));
/* For IP */
fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);

If I just create one structure containing all of the variables needed this gets around the issue, however, I would like to know what I am doing wrong in the first instance.

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Debian :: 99% Cpu Usage Due To Flush-8:0 & Flush-8:16?

Jul 28, 2010

I have recently upgraded my Debian unstable to the new custom 2.6.34 kernel. The system is unresponsive and top shows two processes (flush-8:0 & flush-8:16) taking up most of the cpu time.

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Programming :: Created A Script To Flush Sendmail To Another Mailserver?

Jan 7, 2011

I created a script to flush my sendmail to another mailserver. Because it takes some time I want to give some simple feedback using a rotating bar.

Code:

I'm convinced this can be done much nicer with 'awk' and printf, but somehow awk makes me dazzle..

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Server :: Mysql "flush Logs" Or "flush Tables With Read Lock?

Jan 15, 2010

policy is to backup mysql with mysql-zrm.However at a certain stage it hangs forever. This is at the "flush logs". I tried this manually and it gave the same result. Even after restarting mysql and the host. After some googling and trying I found out "flush tables with read lock" gives the same result. The tables seem to be MyIsam. I tried with a mysqldump on one server and restore it on a test vm. I used the same config and flush logs still hangs. ALso I tried to change some configuration directives... but with the same result

Edit: btw, I checked the logfile and didn't found anything (/var/log/mysqld.log)

Edit2: I also did myisamchk -s *.MYI (in all direcoties with db files;actually did it with find command) and it did not return anything so datafiles seem ok.

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Programming :: C Realloc Resize Array / Delete And Add Information Into The Array?

Mar 6, 2011

I am trying to dynamically delete and add information into the array "blah"

Code:
int blahsize = 1;
char** blah = (char**) calloc(blahsize+1,sizeof(char*));
Adding information:
Code:
blah[1]=stuff1;
blah[2]=stuff2;
code....

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General :: Use The Man / Info / Apropos Pages - Character Instructed The Shell To Interpret A Special Character As An Ordinary Character?

Mar 27, 2010

1.What character instructd the shell to interpret a special character as an ordinary character?

2.What directory contains some of the utilities available on the system in the form of binary files?

3. What command is used to search the location of a utility?

4. What command is used to instruct the editor to write the file and quit the editor?

5. What key quits the more utility and displays the shell prompt?

6. What command starts a child shell as the super user, taking on root's identity and environment?

7. Which wildcard characters can be used for searching all the files in the system that start with "A"?

8. The user name or login name of the super user is????

[Code]....

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Programming :: Convert Short Array To Char Array?

Jun 7, 2010

I have trouble converting a short array to a char array

Code:

short pShort[4] = { 0x41, 0x42, 0x43, 0x44 };

How to convert this to a char array?

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Programming :: Converting A PHP Array Into An HTML Array?

Aug 9, 2009

I'm writing a PHP program. I've encountered a problem; in the following code I try to pass $_POST['delete'] which is an array as the value of a hidden input to some form, but it doesn't do so.there's something wrong with converting PHP array into HTML array. I'm sure that $_POST['delete'] is not null and is a real array.

echo '<input type="hidden" name="delete[]" value="'.$_POST['delete'].'" />';

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Programming :: Filling 2D Array With 1D Array In C?

May 26, 2010

(I am using vector() and matrix() functions from "Numerical recipes in C".)There are 100 numbers to be stored in 2D array of 10 rows and 10 columns.100 numbers are stored in a 1D array.I get "segmentation fault" at the line indicated in the segment of my code below:

Code:

:
:
#define size 100
#define nl 1

[code]....

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Programming :: Bash Array Add Function Example Using Indirect Array Reference As Function Argument?

Jun 20, 2010

I looked on the net for such function or example and didin't find anything, thus after having made one i guess it would be legitimate to drop it to see what others thinks of it.

#!/bin/bash
addelementtoarray()
{
local arrayname=$1

[code]....

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Programming :: Arrays In The C Programming Language Are Pointers To The First Element Of The Array?

Mar 27, 2010

I wonder why arrays in the C programming language are pointers to the first element of the array, not the first element of the array itself?

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Programming :: How To Remove The Last Character

Jun 27, 2010

I have a string like this "/home/test/filename.txt" and i want to delete all character after the last "/". how to do that using sed or awk.

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Programming :: Character Arrays In C?

Nov 3, 2010

I was reading Kernighan Ritchie book chapter 4 which deals with character pointers.I am not able to understand following different type of declarations

Code:
char aname[][15] = { "Illegal month", "Jan", "Feb", "Mar" };
char amessage[] = "now is the time";

[code]...

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Programming :: Get Value In Character String?

Oct 23, 2010

i am compiling the following program in linux. it's in c language. after the compilation with gcc when i run the executable file. it asks for input. but when i enter a name. i prints "Segmentation fault" and then terminate the program. can you please help me.

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>

[code]....

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Programming :: Remove First And Last Character?

Feb 24, 2010

which is the simplest way to have first and last character cropped out from a string? Something simpler than

Code:

echo $STRING | cut -b 2- | rev | cut -b 2- | rev

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Programming :: Sed Substitute Everything Until Character?

Mar 30, 2010

I have the following file:

Code:

1 line
...
49 test test=AA:AA:AA:AA:AA=0

I need to substitute on the line number 49, all text until =. I have used the following, but with no actual result.

sed -re '49s/^.+=//' file
and
sed -e '49s/.*[=]//' file

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Programming :: Check Whether The First Character Is TAB Or Space?

May 11, 2011

I have a file with one line. I want to check whether the first character is TAB or space, how can i do this.? using "cut" wont as it "bypasses the tab and space characters"

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Programming :: Awk Character Position Matching?

Apr 22, 2011

I am trying to check if the 9th character in a file on each line is a v and if so, then print the first word. I've tried a number of variations and am stuck !If it's possible to also check if character position 1 begins with a s in the same awk, that would make it cleaner instead of using egrep.

egrep '^s' file | nawk '{virtual=substr($0,9,1); if ($virtual=="v") {printf "%s", $1}}'
nawk: illegal field $(e)
input record number 1
source line number 1

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Programming :: Counting To A Specific Character?

Feb 12, 2010

I am loading variables for cXtXdXsX disk names into a script, and at present I have only accounted for there being 3 characters from c to t. I need to change it to a variable recognition so that it can count any number of charcters such as c1t , c10t , or c100t.

I can then take that information and use it with the following string to strip off the lead characters so as to make the 3 in $substr either a variable or redirect to multiple occurrences of raw based on the count returned.

sub raw {
$substr = substr ($_, 3);
$raw1 = substr ($substr, 0, -4);
$raw = lc($raw1);
}

how to count from the c to the t inclusive so I get 3, 4, 5, etc ...

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Programming :: Replace The Last Character String?

Jan 19, 2011

how to replace last character string. For example

$>export T1=abcde
$>export T2=xyz

how to get result abcdxyz?

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Programming :: Insert A Character In Line Using Sed/awk?

Jul 25, 2011

I have a string as below

LogFormat "%h %l %u %t "%r" %>s %b "%{Referer}i" "%{User-Agent}i"" combined

Want the above string to be modified as

LogFormat "%h %l %u %D %t "%r" %>s %b "%{Referer}i" "%{User-Agent}i"" combined

inserting %D after %u in the string

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Programming :: MySQL Unsigned Character?

Jan 8, 2010

I am trying to create a table T having a field F which should be able to store variable-length sequences of "unsigned" characters (8bit values ranging from 0 to 255 (not including 0, including 255)).(MAX_LENGTH) is not working, as it seems to want sequences of 8bit values ranging from 0 to 127 (thus "signed" characters).Can anyone help me by pointing out if there is a type suited for my needs (or if such a type does not exist)?For those familiar to C programming and working with the MySQL client library, I should be able to (successfully) do something along the lines of:

Code:
unsigned char value[] = { 'H', 'E', 'L', 'L', 'O', -1, -128, 'W', 'O', 'R', 'L', 'D' };
unsigned char query[255];

[code]....

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Programming :: Remove The Last Character From Variable

Jun 22, 2010

i have the following:

Quote:

echo %host%|sed "$s/.$//"

this would remove the Last character of the value assigned to the %host%. for example if my value is: abcd i get abc. but i am not able to assign the output. for example when i do

Quote:

set k=`echo %host%|sed "$s/.$//"`

after doing echo %k i get no output at the command prompt...!! whereas when i just type:

Quote:

echo abcd|sed "$s/.$//"

at the command prompt i get abc. maybe some other ways to Remove the Last character...?

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Programming :: SQL Substring Matching A Character?

Apr 7, 2011

I have the following string:"My dog spot(page 1)". I want just "My dog spot". How do I do this in SQL Server?

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Programming :: Character Device Driver And Mknod?

Mar 31, 2010

I've a problem with character device mounting. I've a character device module code. Here is the code

Code: /* chardev.c: Creates a read-only char device that says how many times
* you've read from the dev file
*/
#if defined(CONFIG_MODVERSIONS) && ! defined(MODVERSIONS)
#include <linux/modversions.h>
#define MODVERSIONS

[Code]...

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Programming :: Access The Address Of A Character Pointer?

Jul 12, 2010

i was trying to access the address of the character pointer it gives me the values stored in the variable.

Code: #include<iostream>
using namespace std;
int main()
{
char *i;

[Code]....

why is my code not giving the address of the variable i when it is a character pointer.

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Programming :: C++ Character Search In Text File?

Jun 23, 2011

Im trying to read a file in c++ and search for particular character for example if this is a list that I have:

Alice
Bob
David

[code]....

if the input is D, it should give David, if its B, gives bob. so in this case, meaning it reads the first character of every line. but if possible I want to make this dynamic so the user can specify which character position he is looking for, so in case he is looking for R as character index 3 in all lines, it should give Charlie. but the problem is, it does now recognize , besides, I do not know how to specify the character position in each line.

here is my code

Code:

#include <iostream>
#include <fstream>
#include <cstring>

[code]....

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Programming :: Grep Until Certain Character Or Pattern Appears

Jun 25, 2010

I have the following command that greps "/etc/cron.allow" and displays the following 9 lines of $file grep -A 9 "/etc/cron.allow" $file On the other hand I would like to grep a file for a certain text display the next couple of lines and stop when i hit a specified word or blank or pattern.Basically I would like my grep to end when the shell hits a blank, certain key word or pattern specified in command.

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