Download Programming from the Ground Up

Chapter 5. Dealing with Files
Use the Concepts
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Modify the toupper program so that it reads from STDIN and writes to STDOUT instead of
using the files on the command-line.
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Change the size of the buffer.
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Rewrite the program so that it uses storage in the .bss section rather than the stack to store the
file descriptors.
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Write a program that will create a file called heynow.txt and write the words "Hey diddle
diddle!" into it.
Going Further
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What difference does the size of the buffer make?
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What error results can be returned by each of these system calls?
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Make the program able to either operate on command-line arguments or use STDIN or STDOUT
based on the number of command-line arguments specified by ARGC.
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Modify the program so that it checks the results of each system call, and prints out an error
message to STDOUT when it occurs.
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