From f176eb4ce9d433184178d37a598ffdfe1cee1463 Mon Sep 17 00:00:00 2001 From: Rasmus Villemoes Date: Fri, 15 Jan 2016 16:58:56 -0800 Subject: lib/test_printf.c: test precision quirks The kernel's printf doesn't follow the standards in a few corner cases (which are probably mostly irrelevant). Add tests that document the current behaviour. Signed-off-by: Rasmus Villemoes Cc: Al Viro Cc: Andy Shevchenko Cc: Ingo Molnar Cc: Joe Perches Cc: Kees Cook Cc: Maurizio Lombardi Cc: Tejun Heo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/test_printf.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) (limited to 'lib/test_printf.c') diff --git a/lib/test_printf.c b/lib/test_printf.c index 1ce1a1dd8faf..3393d667c6b8 100644 --- a/lib/test_printf.c +++ b/lib/test_printf.c @@ -166,14 +166,23 @@ test_string(void) test("", "%s%.0s", "", "123"); test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456"); test("1 | 2|3 | 4|5 ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5"); + test("1234 ", "%-10.4s", "123456"); + test(" 1234", "%10.4s", "123456"); /* - * POSIX and C99 say that a missing precision should be - * treated as a precision of 0. However, the kernel's printf - * implementation treats this case as if the . wasn't - * present. Let's add a test case documenting the current - * behaviour; should anyone ever feel the need to follow the - * standards more closely, this can be revisited. + * POSIX and C99 say that a negative precision (which is only + * possible to pass via a * argument) should be treated as if + * the precision wasn't present, and that if the precision is + * omitted (as in %.s), the precision should be taken to be + * 0. However, the kernel's printf behave exactly opposite, + * treating a negative precision as 0 and treating an omitted + * precision specifier as if no precision was given. + * + * These test cases document the current behaviour; should + * anyone ever feel the need to follow the standards more + * closely, this can be revisited. */ + test(" ", "%4.*s", -5, "123456"); + test("123456", "%.s", "123456"); test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c"); test("a | | ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c"); } -- cgit v1.2.3