DESCRIPTION
       The malloc() function allocates size bytes and returns a pointer to the
       allocated memory.  The memory is not initialized.  If size is  0,  then
       malloc()  returns either NULL, or a unique pointer value that can later
       be successfully passed to free().

       The free() function frees the memory space pointed  to  by  ptr,  which
       must  have  been  returned by a previous call to malloc(), calloc(), or
       realloc().  Otherwise, or if free(ptr) has already been called  before,
       undefined behavior occurs.  If ptr is NULL, no operation is performed.

比如上一段，我引用在文档中，超出了页边距。想保证矩形格式，但是缩减每行的宽度，有什么现成的工具可以做到吗？
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FROM 125.86.91.*