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document symmetric remainder is used by % and how to get mathematic modulus

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researched during trying to figure out wtf LP#1348614 item 3 i̲s̲
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tg 2014-07-25 21:38:51 +00:00
parent 679240fd97
commit 6c31e7e631
1 changed files with 13 additions and 6 deletions
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@ -1,4 +1,4 @@
.\" $MirOS: src/bin/mksh/mksh.1,v 1.338 2014/07/21 08:06:16 tg Exp $ .\" $MirOS: src/bin/mksh/mksh.1,v 1.339 2014/07/25 21:38:51 tg Exp $
.\" $OpenBSD: ksh.1,v 1.152 2014/02/12 16:28:13 schwarze Exp $ .\" $OpenBSD: ksh.1,v 1.152 2014/02/12 16:28:13 schwarze Exp $
.\"- .\"-
.\" Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, .\" Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
@ -74,7 +74,7 @@
.\" with -mandoc, it might implement .Mx itself, but we want to .\" with -mandoc, it might implement .Mx itself, but we want to
.\" use our own definition. And .Dd must come *first*, always. .\" use our own definition. And .Dd must come *first*, always.
.\" .\"
.Dd $Mdocdate: July 21 2014 $ .Dd $Mdocdate: July 25 2014 $
.\" .\"
.\" Check which macro package we use, and do other -mdoc setup. .\" Check which macro package we use, and do other -mdoc setup.
.\" .\"
@ -2711,8 +2711,15 @@ Shift left (right); the result is the left argument with its bits shifted left
.It + \- * / .It + \- * /
Addition, subtraction, multiplication, and division. Addition, subtraction, multiplication, and division.
.It % .It %
Remainder; the result is the remainder of the division of the left argument by Remainder; the result is the symmetric remainder of the division of the left
the right. argument by the right.
To get the mathematical modulus of
.Dq a Ic mod No b ,
use the formula
.Do
.Pq a % b + b
.No % b
.Dc .
.It Xo .It Xo
.Sm off .Sm off
.Aq Ar arg1 ? .Aq Ar arg1 ?
@ -6436,8 +6443,8 @@ foo \*(Ba bar \*(Ba& read \-p baz # will, however, do so
.Pp .Pp
.Nm mksh .Nm mksh
provides a consistent set of 32-bit integer arithmetics, both signed provides a consistent set of 32-bit integer arithmetics, both signed
and unsigned, with defined wraparound and sign of the result of a modulo and unsigned, with defined wraparound and sign of the result of a
operation, even (defying POSIX) on 64-bit systems. remainder operation, even (defying POSIX) on 64-bit systems.
If you require 64-bit integer arithmetics, use If you require 64-bit integer arithmetics, use
.Nm lksh Pq legacy mksh .Nm lksh Pq legacy mksh
instead, but be aware that, in POSIX, it's legal for the OS to make instead, but be aware that, in POSIX, it's legal for the OS to make