Add example program for file I/O

[mortbopet]

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As indicated by #121, there should be an example program to demonstrate the use of the various file-related system calls. The example program could:

• open a new file for writing
• write something to the file
• seeking in the file
• closing the file
• reopening the file and printing the contents of the file
• ....

[jakariaaa27]

Hi @mortbopet , let me introduce myself, my name is jakaria. I have a final project at my university. one of the topics in this final project is to contribute to solving the issues that exist in your project. I want to try to help you in this case. what I understand in this case you want to add a new various to the system call so that it can help the user if needed. here you want to add

• open a new file for writing
• write something to the file
• seeking in the file
• closing the file
• reopening the file and printing the contents of the file can you explain more detail about it? what I know in the system call in this latest version only briefly describes a function. examples like PrintInt, PrintFloat, Exit... etc.

[jakariaaa27]

@mortbopet do you mean if we click "open" on the system call a dial dialog will appear showing, flag argument? then inside the dial dialog, we can write something inside the file and we can edit the dial dialog for everything?

[mortbopet]

Hey @jakariaaa27 - What is needed for this issue is an example assembly language program (like the others in file->load example->assembly->... which demonstrates the use of the file IO system calls. As i think you hinted to (and as hinted to by the original issue #121), the system call help dialog at help->system calls provides info of the available system calls ---including the file IO related ones--- but this might be a bit ambiguous for those who have not worked with low-level file APIs before.

In writing such an example assembly program, i would suggest you to first sketch out something in C where you also use the linux file API function like fstat, lseek, close and so forth, covering all of the file-related system. Once this C program works, you can then consider how to rewrite it in assembly using the system calls available in Ripes.

[jakariaaa27]

are you expecting like --help to show the information of all system call and implement how these systems can be used and show the example?