LINUX系統程式設計 第二版

進階檔案 I/O

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}

/*

* print_blocks - 替「與 fd 相對應之」檔案所耗用的

* 每個邏輯區塊，在標準輸出印出如下訊息：

* "(logical block, physical block)"

*/

void print_blocks (int fd)

{

int nr_blocks, i;

nr_blocks = get_nr_blocks (fd);

if (nr_blocks < 0) {

fprintf (stderr, "get_nr_blocks failed!\n");

return;

}

if (nr_blocks == 0) {

printf ("no allocated blocks\n");

return;

} else if (nr_blocks == 1)

printf ("1 block\n\n");

else

printf ("%d blocks\n\n", nr_blocks);

for (i = 0; i < nr_blocks; i++) {

int phys_block;

phys_block = get_block (fd, i);

if (phys_block < 0) {

fprintf (stderr, "get_block failed!\n");

return;

}

if (!phys_block)

continue;

printf ("(%u, %u) ", i, phys_block);

}

putchar ...