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My teacher asked my class to make a c program to read data on my linux partition via a c program in windows .
As such , after a good amount of research , i have been unsuccessful to find even the smallest hint as to how .
I realize the eof is different , but changing that allows me to read a file created in linux , not directly access the linux partition itself .
I was hoping that someone could please gimme a clue .
P.S I would really appreciate it if i was not given the complete code / info , i just wanna know where to start .
Can you read a "windows" file on "windows"? This is a good starting point along with manual pages for fopen etc.
EOF is the same everywhere - it is the end of file. The library "stdio" treats it the same wherever. That is why it is called standard IO
Just mount the linux partition onto your windows machine. I think the lecturer was doing this to make sure you was awake during the course.
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I have been learning c and data structures for quite some time now and I wanted to see whether I could apply what I have learnt. I searched a bit and found out that I could start with util linux but, before I could do so, I thought I'd check and perhaps dabble a bit with the code for basic unix commands like "cat". I was able to understand what a part of the code might have been trying to do, but I was not able to understand the entire code as a unit.
For example, in the "cat" code, a pointer to the output buffer and input buffer is declared and is appropriately used, which I could understand. What i could not understand, are parts of code like io_blksize (stat_buf) which has no description whatsoever, on what it does. Or how two pointers declared as pointers to the input and output buffers, actually correspond to the input and output buffers ?
So my question being, how do I approach these type of code, how can I understand something that has no description to what it does (in the example given above) and how can I make and implement changes in the code, so that I can see the changes when i run a command ?
(Would really appreciate references or topics I should start with, so that I can relate what I have learnt to how command code's can be modified. I also apologize if the question is to abstract.)
This is a bit of a subjective question so my answers will just be my opinion of course.
A good place to start when you run into something you don't recognise while reading source code is the manpages. Each function will generally have a manpage, e.g. man 2 read or man 3 printf. Beyond that, I feel perhaps you should get more of a foundation in Unix before attempting to read the straight source code, a good book is Advanced Programming in the Unix Environment. I've been working through it myself and am finding my Unix knowledge improving considerably.
Just my two cents.
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In reading the man pages for tcpdump, I saw that the -dd arguement would output the dump as a fragment of a C file. In what situations is that useful? I take it this is to quickly include and compile the fragment in a program that will be used to process the data according to code we write ourselves? Does this have its utility with unknown or new protocols? Is there some other common, standing situation in which this is needed? Just curious.
It's useful if you're writing a program using libpcap/WinPcap that would use a filter but that, for whatever reason, wouldn't run pcap_compile() to translate a filter string into BPF machine code; it lets you do the compilation with tcpdump and generate some text that you could use in the initialization of an array of struct bpf_insn (a pointer to which, and a count of elements in which, you'd put in a struct bpf_program).
I'm not sure who would do that, however.
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I want to write a program that formats a disc to a new format (not NTFS or FAT32) and can read from and write to the disc, In order to do this, I have to have a way to write single bytes to a disc (without creating files). How do I do that?
EDIT: I found this. But I'm not sure if using CreateFile() as Eli Bendersky said in the first answer (when organized in order of votes) let's you write one byte (or even one bit) at a time, or do you have to write full sectors at a time.
Answer: Since I can't post an answer the question because it was closed, I will answer it write here. You don't need need API functions to do this. All you need to do is open the disk like you open any other file. Like this:
int hFile;
hFile=open("/dev/sdb",0_RDWR);
You program has to directly talk to the driver as you will be by-passing the file-system.
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I'm new to C so please explain your answers as much as you can :)
What i would like to do is this:
i want to create in C a program that goes to a specific site and copies certain data to a txt file from where i can analyze them.
The question is how i copy these informations?
is this something that can be done in C?(if yes tell me the library that i have to use or the code)
for example i want to make my program do this:
go to this site - copy the lines(1-10)
thanx for your help
Simply use curl link to the webpage -o file or wget link to page in your program with system(),
But by default you will get HTML source of page. From that you can copy your required info.
if your link is a text file like this
Then it will fetches as it is. Then you can open that file with fopen().read first ten lines with fgets(). copy into another file.
you can also use libcurl library
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I thought this would be easy to do, but I can't wrap my head arond it.
I need to print a report of all the files in a dir, including sub dirs on a windows server.
Folder01\File01.txt
Folder01\File02.txt
Folder02\File01.txt
etc
Is there an easy way to spit that out to the screen?
Obviously i would pipe to file eventually, but I am still trying to figure out how to get a flat file list of a windows hierarchy printed out
You didn't give a language. There are many options. The simplest is probably dir/b/s in the Windows shell.