CS156 HW4: Strings, File I/O!                

Description                

For this assignment, you will write a program called reader.c that can display files and give information about their contents.                 

Prompt the user for one of four options:                 

    m: print this menu
    c: cat a text file
    i: get information about a text file
    q: quit

If the user chooses to get information or to cat a file, you will need to prompt for the filename.                 

    Filename:

If the user chooses to get information, the program will say how many lines are in the file, how many non-empty lines are in the file, and how many times “luc” (any mix of upper and lower case) occurs.                 

For the following data file:                 

    My dog Lucky

    is plucky!

This output would be produced:                 

    Lines: 3
    Non-empty: 2
    Lucs: 2

Sample Run                

In this sample run, the file bogus doesn’t exist, the file empty.txt has no lines, the file tiny.txt contains a single line with the letter 'x', the file dwarfs.txt contains the names of the seven dwarfs, and hamlet.txt contains Shakespeare’s play Hamlet. (These files are available in ~cs156/pub.)                 

Text like this is typed by the user.                 

“%” is the shell prompt and not a part of your program.                 

    % c11 -Wall reader.c
    % ./a.out
    m: print this menu
    c: cat a text file
    i: get information about a text file
    q: quit
    Action: c
    Filename: bogus
    bogus doesn't end with .txt
    Action: c
    Filename: empty.txt
    Action: c
    Filename: tiny.txt
    x
    Action: c
    Filename: dwarfs.txt
    Doc
    Bashful
    Grumpy
    Happy
    Sleepy
    Sneezy
    Dopey
    Action: i
    Filename: bogus
    bogus doesn't end with .txt
    Action: i
    Filename: tiny.txt
    Lines: 1
    Non-empty: 1
    Lucs: 0
    Action: i
    Filename: dwarfs.txt
    Lines: 7
    Non-empty: 7
    Lucs: 0
    Action: i
    Filename: hamlet.txt
    Lines: 6045
    Non-empty: 4376
    Lucs: 9
    Action: i
    Filename: empty.txt
    That file is empty.
    Action: m
    m: print this menu
    c: cat a text file
    i: get information about a text file
    q: quit
    Action: q
    That is all.

Requirements                

• The maximum size of a filename is 50 characters. Don’t forget space for the terminating '\0'.
• The maximum length (number of characters) in a line in a file is 80 characters. Don’t forget space for the terminating '\0'.
• Only files ending with .txt can be processed for the 'i' and 'c' commands. You need to do error checking to verify this.
• What do you do if the file has no lines? Check the sample output.
• The program should loop until the user types 'q' to quit.
• If the file is not readable by the user for any reason, an error is printed and the user is sent back to the top-level prompt of your program.
• You may not make use of any language features we have not covered yet.
• All output should be exactly like the output shown above. Yes, exactly. Exactly exactly exactly.
• You must write comments in your code describing what the code is supposed to do. You should comment the program as described in class with, at the minimum:
  • a comment header at the very very very beginning containing your name, date, and purpose of your source file
  • a comment before each function, describing what it does
• You must name your program reader.c
• Remember, don’t use sizeof() on an array parameter.
• No global variables. Global constants are ok.
• You must fclose any file that you fopen.
• Use char constants for char values, not int ASCII values: 'A', not 65.
• Use functions to break this up into smaller chunks of code. Don't put it all in main().

How to submit your homework:                

Use                 

    ~cs156/bin/checkin HW4 reader.c

How to receive negative points:                

Turn in someone else’s work.