Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Interesting Problem About Incrementing ++
Top Forums Programming Interesting Problem About Incrementing ++ Post 302248968 by f.ben.isaac on Monday 20th of October 2008 08:53:00 AM
Old 10-20-2008
Quote:
Originally Posted by MrC
A character array is never empty. It is a contiguous array of memory cells, each of which contains some value. You are using a character array to represent strings; as such, you must manage the terminating NULL byte '\0'.

If you want to use strcpy(), you must ensure that there is a NULL byte at the location where you want the copy to begin. If you are trying to copy into an array for the first time, use strcat(). Use strcpy() to append to an existing array (or again, set the first byte to '\0').

It is not useful to attempt to diagnose other errors you see when there are likely out of bounds array copies occurring, as the stack becomes trashed.

Never use any function that copies memory from one location to another which is of unknown length, or copy a know length to an offset that would make the copy exceed the bounds of the variable or data structure. Use strncat() or strncpy() to ensure the copy never exceeds the variable's bounds.
Thanks!!!! This advice will help me now and later on .... I will play around with it....Anyhow, i was trying to write a simple very basic local port scanner, do you think the algorithm of my code right?
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

An interesting problem

hi!, here is an interesting problem ..... I ftp a file named " my first file.doc" from windows to my HP workstation. Ftp is succesful. The file appears with the same name in my home directory.. But now how do I open this file?? while using Vi or More or other editor, they take only the... (5 Replies)
Discussion started by: jyotipg
5 Replies

2. UNIX for Advanced & Expert Users

interesting problem

After a server reboot for regular mainatanance we face the following situation: 1/ user accounts with ksh can't start the korn shell 2/ korn shell scripts do work however, if executed from bash 3/ normal users with bash can't run ksh 4/ root can run ksh 5/ if I switch the default shell to... (3 Replies)
Discussion started by: rein
3 Replies

3. SCO

I have an interesting problem and need advice

We have an inhouse built application which handles our AR function. We'd like to email statements out of the application directly. My question is this is there a good, solid, command line driven, scriptable Mail Transport Agent that would allow us to send a semi unique email (with a statement and... (1 Reply)
Discussion started by: Maldain
1 Replies

4. Shell Programming and Scripting

Interesting problem

Hello, So I'm utilizing the bash brace expansion feature to checkout multiple folders from cvs with ease, while excluding certain subfolders within. So I do a command like this: cvs co trunk/{mod_a,mod_b,mod_c} \!trunk/{mod_a,mod_b,mod_c}/web to checkout modules trunk/mod_a , trunk/mod_b ,... (1 Reply)
Discussion started by: neked
1 Replies

5. Shell Programming and Scripting

interesting problem

Hi, I am new in this forum and I am glad to be a part of it. I have a problem that has two parts: 1/ extract just the timestamp from a filename: for example, I have a file called 'sales20080226144525.txt' and I want to extract just the '20080226144525' part out of it. 2/ Now, take that... (5 Replies)
Discussion started by: ChicagoBlues
5 Replies

6. Solaris

Very Interesting Problem

Ok Lets say i have a webpage on a solaris box. and i am trying to make a hyperlink. This hyperlink references a Microsoft Access file on a Windows box. So, How do i make a file reference from The unix box to a windows box. Things to keep in mind -- 1.) Solaris doesnt need to... (6 Replies)
Discussion started by: Demon002
6 Replies

7. Shell Programming and Scripting

Facing problem in incrementing the variable

When I did, echo $SHELL in cmd prompt of putty, its displaying /bin/sh And in my shell script., I hav started with., #!/bin/sh and i=1; while ; do . . . i=$; (9 Replies)
Discussion started by: av_vinay
9 Replies

8. Shell Programming and Scripting

AWK SCRIPT HELP : INCREMENTING PROBLEM

Hi Guys , I am having one command file like this FILE1 ################################ awk '/output/ {a=$2} {for(i=1;i<=NF;i++) { gsub("i1", i) ; gsub("i2",++i) ; gsub("P1", p) }}1' output >> out9 awk '/output/ {a=$2} {for(i=1;i<=NF;i++) { gsub("i1", i) ;... (2 Replies)
Discussion started by: jaita
2 Replies

9. Solaris

Interesting Disk Error Problem

Hi Folks, Have an interesting problem here, have just upgraded some machines (Test and Development) to the latest and greatest as in. SunOS ss063a 5.10 Generic_147440-13 sun4u sparc SUNW,Sun-Fire-V440 However on all the systems we are seeing the same problems, during the boot there is a... (3 Replies)
Discussion started by: gull04
3 Replies

10. Shell Programming and Scripting

Interesting awk problem

Hello; I wish to manipulate the output from the following: ps axo %mem,pid,euser,cmd|sort -nr 14.4 3170 root /usr/sbin/snmpd -Lsd -Lf /dev/null -p /var/run/snmpd.pid -a 3.6 3635 root splunkd -p 8089 start 2.6 3383 root /usr/sbin/httpd 2.1 15496 apache /usr/sbin/httpd ... (5 Replies)
Discussion started by: delphys
5 Replies

LEARN ABOUT OSX

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
All times are GMT -4. The time now is 06:42 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy