Read e-book online No Bugs!: Delivering Error Free Code in C and C++ PDF

By David Thielen

No insects! bargains a innovative method of software program improvement through displaying programmers easy methods to write error-free code from the beginning. No insects! offers options to prevent many different types of insects from being incorporated in a prog ram. It additionally discusses tips to try out courses to discover insects.

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Read or Download No Bugs!: Delivering Error Free Code in C and C++ PDF

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Extra resources for No Bugs!: Delivering Error Free Code in C and C++

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Freeing a structure The program example below illustrates the use of filling a buffer. c file contents LinkListDelete (elem *p) { // Take p out of the linked list (p->next)->prev = p->prev; (p->prev)->next = p->next; // Fill p DebugMemSet (p, sizeof (elem)); // Add p to free list p->next = pFree->next; pFree->next = p; } The above example can be used not only for memory, but also for disk I/O. If you delete a record in a database file, filling the deleted record will guarantee that you get bad data if another record is still pointing to the deleted record.

This is critical to insure that your program does not swallow up resources every time you run it. Any files opened should be closed. Any DOS, EMS, or XMS memory you allocated should be freed. This is critical for EMS and XMS memory because DOS will not free that memory on exit itself. Also, if this memory is not freed, your program is probably wasting resources while it is running. 5. Check your heap for allocateated memory that is not freed. If you use both the near and far heaps, check both. Unfreed memory generally indicates a logic error when you finish an action.

If you are accessing malloced memory, then the pointer should be in the heap. If you are freeing or reallocing memory, it should be a pointer to an allocated area in the heap. Be careful not to overcheck. It is totally legitimate to call free on a NULL pointer. You do not want warning messages popping up for function calls that you consider legitimate. You also do not want to make your code bigger to avoid calling a function in a way that is benign but creates a warning message. The checking should cover all errors and no legitimate calls.

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