In Lab 7's phonebook utility, you may have noticed that it wasn't
very efficient to call qsort() on each invocation in order to re-sort
the faculty array. In this lab we will correct that deficiency and build
some command-line tools for working with phonebooks in binary format.
Create the following command-line tools:
Takes no command-line arguments. Calls qsort() four times on the
faculty array, sorting by each of name, office, phone, and
email. Uses the open(), write(), and close() system calls to
write the sorted array to binary files named name.bin, office.bin,
phone.bin, and email.bin.
$ ls
mkphone
$ ./mkphone
$ ls
email.bin mkphone name.bin office.bin phone.bin
Takes one command-line argument: the name of a sorted array binary
file. Uses the open(), read(), and close() system calls to dump
the contents of the file to stdout.
$ ./lsphone name.bin
Barua, Susamma
CS-502
(657) 278-3362
[email protected]
...
Wortman, Kevin
CS-538
(657) 278-2968
[email protected]
$ ./lsphone email.bin
Cong, Bin
CS-417
(657) 278-2031
[email protected]
Tian, Yun
CS-538
(657) 278-2041
[email protected]
Tip: whenever you work with binary files, it's a good idea to write a small utility to dump a file's contents just to make sure that you understand the format.
Takes two command-line arguments: the name of a sorted array binary
file and a key to search for. Uses open(), read(), and close()
to load the sorted array and bsearch() to search it.
$ ./phone
Usage: phone <file> <string>
$ ./phone email.bin
Usage: phone <file> <string>
$ ./phone email.bin [email protected]
Wortman, Kevin
CS-538
(657) 278-2968
[email protected]
$ ./phone name.bin 'Panangadan, Anand'
Panangadan, Anand
CS-538
(657) 278-3998
[email protected]
...
$ ./phone email.bin [email protected]
No match.