Program to perform a conversion on characters in a text file, Assembly Language

Write an assembly language program to perform a rot131 conversion on characters in a text file.  The program should read charatcers from the input file, perform the rot13 conversion, and write the characters to the output file.  The program should read the buffer size (large or small), name of an input file, and the name of an output file from the command line.  For example:

ed-vm% ./rot13  -b l  -i file.txt  -o tmp.txt

The provided main program calls the following routines:

? A getOptions() procedure that reads and checks the command line arguments. The command line arguments must be in the format of:  /b= /i= /o= in that order.  The buffer size should be "l" or "s".  To check the file name, attempt to open the file.  If the files open correctly, the routine should return the file descriptor (for each file).  If there is an error, an appropriate error message should be displayed (see examples).

? A readBuff() procedure to read the input file and return the characters in a buffer.  The procedure will use the buffer address, file descriptor, and buffer size flag to read the file.  The procedure should return the characters in the buffer and the count of characters.  The procedure should also return a flag (true/false) for the last read.

? A rotate13() procedure to perform the rot13 function on the characters in the buffer.  The rot13 function is as follows:

NewCharacter = (Character+13) mod 26

The procedure will use the buffer address and character count.

? A writeBuff() procedure to write the modified buffer to the output file.  The procedure will use the buffer address, file descriptor, and count of characters.

To ensure efficient I/O operations, the program must buffer the data read and written.  For this assignment, the buffer size should be either 2 for the 'small' or 60,000 for the 'large' buffer size.

Note, a utility for testing will be made available on the class web page.

Note, your procedures must be placed into a separate file and linked with the provided main.  Refer to the handout for directions how to link multiple files.  Only the procedures file, not the provided main, will be submitted on-line.  As such, you must not change the provided main!

Testing

A batch file to execute the program on a series of pre-defined inputs will be provided.  The test script compares the program output to pre-defined expected output (based on the example I/O).

Posted Date: 2/27/2013 5:33:26 AM | Location : United States







Related Discussions:- Program to perform a conversion on characters in a text file, Assignment Help, Ask Question on Program to perform a conversion on characters in a text file, Get Answer, Expert's Help, Program to perform a conversion on characters in a text file Discussions

Write discussion on Program to perform a conversion on characters in a text file
Your posts are moderated
Related Questions
Write a procedure to read a text file and copy its contents to another text file using 8086 assembly language .

segmentation and overlapping in assemble language

Architecture Of 8088 The register set of 8088 is accurately the same as in to 8086. The architecture of 8088 is also same to 8086 except for 2 changes; a) 8088 has 4-byte instr

How to write an assembly program The initial step in writing an assembly language program is to identify and study the problem. After studying the problem, choose the logical m

what is double hashing

Zero flag: The next line compares the value in register. A with the value 1. If they are equivalent, the Zero flag is set (to 1). The next line then jumps to start: only if th

check the al-register for palindromic number

AAD: ASCII Adjust for Division though the names of these 2 instructions (AAM and AAD) seem to be same, there is many difference between their functions. The AAD instruction conver

code, Assembly Language How to print strings in Right Triangle form?

i have a question.