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`getdelim` and `getline` may free, allocate, or re-allocate the input buffer, ensuring its size is enough to hold the incoming line, the delimiter, and the null terminator. `*lineptr` must be a valid argument to `free`, which means it can be either 1. `NULL`, in which case these functions perform an allocation equivalent to a call to `malloc` even on failure. 2. A pointer returned by the `malloc` family of functions. Other pointers are UB (`alloca`, a pointer to a static, to a stack variable, etc.)