From: Sean Anderson <seanga2@gmail.com>
To: util-linux@vger.kernel.org, Karel Zak <kzak@redhat.com>
Cc: Mikhail Gusarov <dottedmag@dottedmag.net>,
Matthew Harm Bekkema <id@mbekkema.name>,
James Peach <jpeach@apache.org>,
Sean Anderson <seanga2@gmail.com>
Subject: [PATCH v2 1/6] include/c: Add abs_diff macro
Date: Wed, 24 Nov 2021 13:26:13 -0500 [thread overview]
Message-ID: <20211124182618.1801447-2-seanga2@gmail.com> (raw)
In-Reply-To: <20211124182618.1801447-1-seanga2@gmail.com>
This macro calculates abs(a - b). It is especially useful for unsigned
numbers.
Signed-off-by: Sean Anderson <seanga2@gmail.com>
---
(no changes since v1)
include/c.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/c.h b/include/c.h
index 354b59e29..ba799d8fd 100644
--- a/include/c.h
+++ b/include/c.h
@@ -159,6 +159,14 @@
_max1 > _max2 ? _max1 : _max2; })
#endif
+#ifndef abs_diff
+# define abs_diff(x, y) __extension__ ({ \
+ __typeof__(x) _a = (x); \
+ __typeof__(y) _b = (y); \
+ (void) (&_a == &_b); \
+ _a > _b ? _a - _b : _b - _a; })
+#endif
+
#ifndef cmp_numbers
# define cmp_numbers(x, y) __extension__ ({ \
__typeof__(x) _a = (x); \
--
2.33.0
next prev parent reply other threads:[~2021-11-24 18:26 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-24 18:26 [PATCH v2 0/6] unshare: Add support for mapping ranges of user/group IDs Sean Anderson
2021-11-24 18:26 ` Sean Anderson [this message]
2021-11-24 18:26 ` [PATCH v2 2/6] unshare: Add waitchild helper Sean Anderson
2021-11-24 18:26 ` [PATCH v2 3/6] unshare: Add some helpers for forking and synchronizing Sean Anderson
2021-11-24 18:26 ` [PATCH v2 4/6] unshare: Add options to map blocks of user/group IDs Sean Anderson
2021-11-24 18:26 ` [PATCH v2 5/6] unshare: Add option to automatically create user and group maps Sean Anderson
2021-11-24 18:26 ` [PATCH v2 6/6] unshare: Document --map-{groups,users,auto} Sean Anderson
2021-12-01 15:16 ` [PATCH v2 0/6] unshare: Add support for mapping ranges of user/group IDs Karel Zak
2022-01-14 10:29 ` Daniel Gerber
2022-01-14 14:42 ` Sean Anderson
2022-01-14 17:15 ` Daniel Gerber
2022-01-15 0:53 ` Sean Anderson
2022-01-18 11:50 ` Karel Zak
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