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fileio: optionally allow interpreting file size as limit

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This commit is contained in:
Lennart Poettering
2021-07-08 09:29:53 +02:00
parent c1631ee124
commit 7b0da71d49
3 changed files with 56 additions and 17 deletions
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src/test/test-fileio.c
+19
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@@ -999,6 +999,25 @@ static void test_read_full_file_offset_size(void) {
assert_se(memcmp(buf, rbuf, rbuf_size) == 0);
rbuf = mfree(rbuf);
assert_se(read_full_file_full(AT_FDCWD, fn, UINT64_MAX, 128, READ_FULL_FILE_FAIL_WHEN_LARGER, NULL, &rbuf, &rbuf_size) == -E2BIG);
assert_se(read_full_file_full(AT_FDCWD, fn, UINT64_MAX, sizeof(buf)-1, READ_FULL_FILE_FAIL_WHEN_LARGER, NULL, &rbuf, &rbuf_size) == -E2BIG);
assert_se(read_full_file_full(AT_FDCWD, fn, UINT64_MAX, sizeof(buf), READ_FULL_FILE_FAIL_WHEN_LARGER, NULL, &rbuf, &rbuf_size) >= 0);
assert_se(rbuf_size == sizeof(buf));
assert_se(memcmp(buf, rbuf, rbuf_size) == 0);
rbuf = mfree(rbuf);
assert_se(read_full_file_full(AT_FDCWD, fn, 47, 128, READ_FULL_FILE_FAIL_WHEN_LARGER, NULL, &rbuf, &rbuf_size) == -E2BIG);
assert_se(read_full_file_full(AT_FDCWD, fn, 47, sizeof(buf)-47-1, READ_FULL_FILE_FAIL_WHEN_LARGER, NULL, &rbuf, &rbuf_size) == -E2BIG);
assert_se(read_full_file_full(AT_FDCWD, fn, 47, sizeof(buf)-47, READ_FULL_FILE_FAIL_WHEN_LARGER, NULL, &rbuf, &rbuf_size) >= 0);
assert_se(rbuf_size == sizeof(buf)-47);
assert_se(memcmp(buf+47, rbuf, rbuf_size) == 0);
rbuf = mfree(rbuf);
assert_se(read_full_file_full(AT_FDCWD, fn, UINT64_MAX, sizeof(buf)+1, READ_FULL_FILE_FAIL_WHEN_LARGER, NULL, &rbuf, &rbuf_size) >= 0);
assert_se(rbuf_size == sizeof(buf));
assert_se(memcmp(buf, rbuf, rbuf_size) == 0);
rbuf = mfree(rbuf);
assert_se(read_full_file_full(AT_FDCWD, fn, 1234, SIZE_MAX, 0, NULL, &rbuf, &rbuf_size) >= 0);
assert_se(rbuf_size == sizeof(buf) - 1234);
assert_se(memcmp(buf + 1234, rbuf, rbuf_size) == 0);