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Commit 1ca8e8eb authored by Rasmus Villemoes's avatar Rasmus Villemoes Committed by Linus Torvalds
Browse files

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: default avatarRasmus 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f176eb4c

lib/test_printf.c

+24 −0
Original line number Diff line number Diff line
@@ -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