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appropriate systems. The list of utilities covers a substantial part of those that are commonly used, such as the mail
program, screen editors, compilers, and document formatting packages. The list also includes less commonly used
utilities, such as cb, the C language pretty-printer.
Each utility program that we tested was subjected to several different types of input streams. The different
types of inputs were intended to test for a variety of errors that might be triggered in the utilities that we were testing. The major variations in test data were including non-printable (control) characters, including the NULL (zero)
byte, and maximum length of the input stream. These tests are summarized in Table 3a.
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