c - 使用 realloc 调整缓冲区大小

Question

If the area pointed to was moved, a free(ptr) is done.

你能解释一下关于 realloc() 的上面那行代码吗？此行来自 calloc、malloc、realloc 和 free 的手册页。

Answer 1

我认为这更好地解释了它:

If sufficient space does not exist to expand the current block in its current location, a new block of the size for size is allocated, and existing data is copied from the old block to the beginning of the new block. The old block is freed, and the function returns a pointer to the new block.

引用自 realloc in C