Find the Bug A Book of Incorrect Programs - download pdf or read online

By Adam Barr

To seize a malicious program you want to imagine like a malicious program, and Barr (software programming supervisor) will get totally insectual. He provides functional tips about going past the debuggers by means of strolling during the code, completely knowing the code (all the code, together with C, Python, Java, Perl, and x86 meeting language) and dealing down the meals chain from the main prone to the least most likely varmint that's free on your or an individual else's paintings. He contains classifications of insects, their basic resources, and how one can tune their harm past the preliminary chew. Barr contains many examples and step by step methodologies.

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Thus, the first span checked by the if on lines 21 22, with block_index equal to 0, won't be big enough: array_in_use[0] is 1, and blocks_needed is 2. Line 34 changes block_index to 1; on the second iteration of the while loop, the check on lines 21 22 is also false because array_in_use[1] is -1. The code to advance block_index on line 34, instead of changing it to 2 as it should, instead moves it back to 0. So, the while winds up looping forever as block_index ping-pongs between 0 and 1. < Day Day Up > < Day Day Up > 63 64 Memory Free This function frees memory allocated by the previous program.

Explanation of the Bug The code is fine until the return statement at line 43: return new_element; The two special cases at the top catch both situations in which the head of the list changes to new_element: Lines 11 14 handle the list being empty, and lines 20 23 handle the new element becoming the head of the list. In both cases, the code immediately returns new_element as the new head of the list. For example, in the first hint, the existing list is non-empty, but the new entry becomes the new head of the list, so the list is modified on line 21 and the new head is returned on line 22.

5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 48 entry * insert_linked_list( entry * current_head, entry * new_element) { entry * current_element; // If the list is empty, then just return // new_element; if (current_head == NULL) { new_element->next = NULL; return new_element; } // If new_element should be the first on the list, // attach the current list to new_element and return // new_element as the new head of the list.

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