Peter noted a weirdness in my new bswap code, which could use some tests to justify it.
Signed-off-by: Eric Anholt <e...@anholt.net> Reviewed-by: Peter Hutterer <peter.hutte...@who-t.net> --- test/misc.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/test/misc.c b/test/misc.c index ae46ccccbab9..c10a2b935bc4 100644 --- a/test/misc.c +++ b/test/misc.c @@ -192,6 +192,48 @@ dix_request_size_checks(void) assert(rc == Success); } +static void +bswap_test(void) +{ + const uint16_t test_16 = 0xaabb; + const uint16_t expect_16 = 0xbbaa; + const uint32_t test_32 = 0xaabbccdd; + const uint32_t expect_32 = 0xddccbbaa; + const uint64_t test_64 = 0x11223344aabbccddull; + const uint64_t expect_64 = 0xddccbbaa44332211ull; + uint16_t result_16; + uint32_t result_32; + uint64_t result_64; + unsigned buffer[sizeof(test_64) + 4]; + void *unaligned = &buffer[1]; + + assert(bswap_16(test_16) == expect_16); + assert(bswap_32(test_32) == expect_32); + assert(bswap_64(test_64) == expect_64); + + /* Test the swapping-in-a-pointer functions, with unaligned + * addresses (the functions shouldn't cause traps in that case). + */ + for (int i = 0; i < 2; i++) { + unaligned = buffer + i; + if (((uintptr_t)unaligned & 1) == 1) + break; + } + memcpy(unaligned, &test_16, sizeof(test_16)); + swaps((uint16_t *)unaligned); + memcpy(&result_16, unaligned, sizeof(result_16)); + assert(result_16 == expect_16); + + memcpy(unaligned, &test_32, sizeof(test_32)); + swapl((uint32_t *)unaligned); + memcpy(&result_32, unaligned, sizeof(result_32)); + assert(result_32 == expect_32); + + memcpy(unaligned, &test_64, sizeof(test_64)); + swapll((uint64_t *)unaligned); + memcpy(&result_64, unaligned, sizeof(result_64)); + assert(result_64 == expect_64); +} int misc_test(void) @@ -199,6 +241,7 @@ misc_test(void) dix_version_compare(); dix_update_desktop_dimensions(); dix_request_size_checks(); + bswap_test(); return 0; } -- 2.11.0 _______________________________________________ xorg-devel@lists.x.org: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: https://lists.x.org/mailman/listinfo/xorg-devel