lib/test_printf.c: add a few number() tests

This adds a few tests to test_number, one of which serves to document
another deviation from POSIX/C99 (printing 0 with an explicit precision
of 0).

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>

diff --git a/lib/test_printf.c b/lib/test_printf.c
index 3393d66..b23ce82 100644 (file)
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -158,6 +158,30 @@ test_number(void)
        test("0x1234abcd  ", "%#-12x", 0x1234abcd);
        test("  0x1234abcd", "%#12x", 0x1234abcd);
        test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
+       test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
+       test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
+       test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
+       /*
+        * POSIX/C99: »The result of converting zero with an explicit
+        * precision of zero shall be no characters.« Hence the output
+        * from the below test should really be "00|0||| ". However,
+        * the kernel's printf also produces a single 0 in that
+        * case. This test case simply documents the current
+        * behaviour.
+        */
+       test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
+#ifndef __CHAR_UNSIGNED__
+       {
+               /*
+                * Passing a 'char' to a %02x specifier doesn't do
+                * what was presumably the intention when char is
+                * signed and the value is negative. One must either &
+                * with 0xff or cast to u8.
+                */
+               char val = -16;
+               test("0xfffffff0|0xf0|0xf0", "%#02x|%#02x|%#02x", val, val & 0xff, (u8)val);
+       }
+#endif
 }
 
 static void __init