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| author | Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2016-01-15 16:58:59 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-16 11:17:28 -0800 |
| commit | 1ca8e8ebe991ff628d7e03ad4b5a11817a9655d5 (patch) | |
| tree | 7849fb1a4f19f56f80a6f7049f719a2e8a0b579a /lib/test_printf.c | |
| parent | f176eb4ce9d433184178d37a598ffdfe1cee1463 (diff) | |
| download | lwn-1ca8e8ebe991ff628d7e03ad4b5a11817a9655d5.tar.gz lwn-1ca8e8ebe991ff628d7e03ad4b5a11817a9655d5.zip | |
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>
Diffstat (limited to 'lib/test_printf.c')
| -rw-r--r-- | lib/test_printf.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/lib/test_printf.c b/lib/test_printf.c index 3393d667c6b8..b23ce824766f 100644 --- 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 |