Find the Bug A Book of Incorrect Programs by Adam Barr

By Adam Barr

To capture a computer virus you need to imagine like a malicious program, and Barr (software programming supervisor) will get completely insectual. He provides functional pointers on going past the debuggers by means of strolling during the code, completely figuring out the code (all the code, together with C, Python, Java, Perl, and x86 meeting language) and dealing down the nutrition chain from the main prone to the least most probably varmint that's free on your or a person else's paintings. He contains classifications of insects, their basic resources, and how one can tune their harm past the preliminary chunk. Barr comprises many examples and step by step methodologies.

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The calculation of blocks_needed on lines 8 9 and the return statement on line 53 are both complicated. Verify that they are correct. 3. What is the loop counter for the while loop on lines 19 35? Is it properly incremented? Are the initialization and termination clauses correct? 4. For the five local variables, note any sections of the code in which they stay invariant. Hints Walk through the code with the following parameters to the function: 1. The initial case: Nothing has been allocated, so the array_in_use[] array is still set up the way it was by the memory_init() function: array_in_use[0] == BLOCK_COUNT array_in_use[1] == BLOCK_COUNT array_in_use[2] == BLOCK_COUNT ...

Source_ptr = source; 29. source_end = source + (length-1); 30. target_ptr = target; 31. step = 1; 32. } 33. 34. // 35. // Now do the copy. 36. // 37. while (1) { 38. 39. 54 if (source_ptr == source_end) done = 1; 55 40. *target_ptr = *source_ptr; 41. if (done) 42. break; 43. source_ptr += step; 44. target_ptr += step; 45. } 46. } Suggestions 1. Consider the local variable done. Where is it used? Is it used correctly? 2. The if on lines 21 and 22 is the heart of the algorithm. Is it correctly calculating whether the buffers overlap?

Of course, some functions do not have any input that could be considered a real error. But in most cases, it should be possible to come up with an error input and walk through it. Loops Just as you can't walk through your code with all possible inputs, you usually can't walk through every iteration of a loop. In some cases, you can control the number of iterations of the loop by limiting the input size. With code such as the following int sum_array(int arr[], int count) { int j; for (j = 0; j < count; j++) { // code to sum the array } // return the sum } the input to the function directly controls how many times the loop iterates.

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