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The first line looks like an error message and we wasted some time before realizing it's actually a string in the program, and the output is correct at least as far as it goes It's not unknown to have a debugging session derailed by misunderstanding the source of a message But there should be more output Where is it Late one night, the light finally dawned ("I've seen that before!") This is a portability problem that is described in more detail in 8 We had originally written the program to read only from its standard input using getchar On Windows however, getchar returns EOF when it encounters a particular byte ( O x l A or control-Z) in text mode input and this was causing the early termination This is absolutely legal behavior, but not what we were expecting given our Unix background The solution is to open the file in binary mode using the mode " r b " But s t d i n is already open and there is no standard way to change its mode (Functions like fdopen or setmode could be used but they are not part of the C standard) Ultimately we face a set of unpalatable alternatives: force the user to provide a file name so it works properly on Windows but is unconventional on Unix; silently produce wrong answers if a Windows user attempts to read from standard input; or use conditional compilation to make the behavior adapt to different systems, at the price of reduced portability We chose the first option so the same program works the same way everywhere
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Exercise 5-2 The s t r i n g s program prints strings with MINLEN or more characters, which sometimes produces more output than is useful Provide s t r i n g s with an optional argument to define the minimum string length Exercise 5-3 Write v i s , which copies input to output except that it displays nonprintable bytes like backspaces, control characters and non-ASCII characters as \Xhh where hh is the hexadecimal representation of the non-printable byte By contrast with s t r i n g s , v i s is most useful for examining inputs that contain only a few nonprinting characters Exercise 5-4 What does v i s produce if the itput is \XOA How could you make the output of v i s unambiguous Exercise 5-5 Extend v i s to process a sequence of files, fold long lines at any desired column, and remove non-printable characters entirely What other features might be consistent with the role of the program
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SECTION 57
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Realistically, most programmers do not have the fun of developing a brand new system from the ground up Instead, they spend much of their time using, maintaining modifying and thus, inevitably, debugging code written by other people When debugging others' code, everything that we have said about how to debug your own code applies Before starting, though, you must first acquire some understanding of how the program is organized and how the original programmers thought and wrote The term used in one very large software project is "discovery," which is not a bad metaphor The task is discovering what on earth is going on in something that you didn't write This is a place where tools can help significantly Text-search programs like grep can find all the occurrences of names Cross-referencers give some idea of the program's structure A display of the graph of function calls is valuable if it isn't too big Stepping through a program a function call at a time with a debugger can reveal the sequence of events A revision history of the program may give some clues by showing what has been done to the program over time Frequent changes are often a sign of code that is poorly understood or subject to changing requirements and thus potentially buggy Sometimes you need to track down errors in software you are not responsible for and d o not have the source code for In that case, the task is to identify and characterize the bug sufficiently well that you can report it accurately and at the same time perhaps find a "work-around" that avoids the problem If you think that you have found a bug in someone else's program, the first step is to make absolutely sure it is a genuine bug, so you don't waste the author's time and lose your own credibility When you find a compiler bug, make sure that the error is really in the compiler and not in your own code For example, whether a right shift operation fills with zero bits (logical shift) or propagates the sign bit (arithmetic shift) is unspecified in C and C++, s o novices sometimes think it's an error if a construct like
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yields an unexpected answer But this is a portability issue, because this statement can legitimately behave differently on different systems Try your test on multiple systems and be sure you understand what happens; check the language definition to be sure Make sure the bug is new Do you have the latest version of the program IS there a list of bug fixes Most software goes through n~ultiple releases; if you find a bug in version 40b1, it might well be fixed or replaced by a new one in version 404b2 In any case, few programmers have much enthusiasm for fixing bugs in anything but the current version of a program
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