Messages in this thread Patch in this message | | | From | Björn Töpel <> | Subject | [PATCH v2 2/2] lib/test_string.c: Add strncmp() tests | Date | Tue, 28 Feb 2023 19:42:45 +0100 |
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From: Palmer Dabbelt <palmer@rivosinc.com>
The RISC-V strncmp() fails on some inputs, see the linked thread for more details. It turns out there were no strncmp() calls in the self tests, this adds one.
Link: https://lore.kernel.org/all/2801162.88bMQJbFj6@diego/ Reported-by: Heiko Stübner <heiko@sntech.de> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Björn Töpel <bjorn@rivosinc.com> ---
v1->v2: Added two more tests (pos/neg). (Andy) Minor code style issues. (Andy) Fixed checkpatch errors.
--- lib/test_string.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+)
diff --git a/lib/test_string.c b/lib/test_string.c index 550229084c41..b95037eb138b 100644 --- a/lib/test_string.c +++ b/lib/test_string.c @@ -209,6 +209,44 @@ static __init int strspn_selftest(void) return 0; } +struct strncmp_test { + const char *str_a; + const char *str_b; + unsigned long count; + unsigned long max_off; + int retval; +}; + +static __init int strncmp_selftest(void) +{ + size_t i; + static const struct strncmp_test tests[] __initconst = { + { "/dev/vda", "/dev/", 5, 4, 0 }, + { "/dev/vda", "/dev/vdb", 5, 4, 0 }, + { "00000000---11111", "00000000---11112", 12, 4, 0 }, + { "ABC", "AB", 3, 0, 67 }, + { "ABA", "ABZ", 3, 0, -25 }, + { "ABC", "ABC", 3, 0, 0 }, + }; + + for (i = 0; i < ARRAY_SIZE(tests); ++i) { + const struct strncmp_test *s = tests + i; + size_t off; + + for (off = 0; off <= s->max_off; off++) { + int res = strncmp(s->str_a + off, s->str_b + off, s->count - off); + + if (res == 0 && s->retval != 0) + return 0x1000 + 0x100*off + 0x10*i + 0x0; + if (res > 0 && s->retval <= 0) + return 0x1000 + 0x100*off + 0x10*i + 0x1; + if (res < 0 && s->retval >= 0) + return 0x1000 + 0x100*off + 0x10*i + 0x2; + } + } + return 0; +} + static __exit void string_selftest_remove(void) { } @@ -247,6 +285,11 @@ static __init int string_selftest_init(void) if (subtest) goto fail; + test = 7; + subtest = strncmp_selftest(); + if (subtest) + goto fail; + pr_info("String selftests succeeded\n"); return 0; fail: -- 2.37.2
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