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authorRasmus Villemoes <linux@rasmusvillemoes.dk>2016-01-15 16:58:56 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-16 11:17:28 -0800
commitf176eb4ce9d433184178d37a598ffdfe1cee1463 (patch)
tree40fe2de0113099e8989119591d13ac8339ded1ba /lib/test_printf.c
parent331e4deb6dfdac50d3f9c4ccbc41b1427335e212 (diff)
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 <linux@rasmusvillemoes.dk> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Joe Perches <joe@perches.com> Cc: Kees Cook <keescook@chromium.org> Cc: Maurizio Lombardi <mlombard@redhat.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/test_printf.c')
-rw-r--r--lib/test_printf.c21
1 files changed, 15 insertions, 6 deletions
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");
}