lib/libmp/mp.3

.\" Copyright (c) 1986, 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" %sccs.include.proprietary.roff%
.\"
.\"	@(#)mp.3	8.1 (Berkeley) 06/04/93
.\"
.Dd
.Dt MP 3
.Os BSD 4.3
.Sh NAME
.Nm fmin ,
.Nm fmout ,
.Nm gcd ,
.Nm invert ,
.Nm itom
.Nm m_in ,
.Nm m_out ,
.Nm madd ,
.Nm mcmp,
.Nm mdiv ,
.Nm min ,
.Nm mout ,
.Nm move ,
.Nm msqrt ,
.Nm msub ,
.Nm mult ,
.Nm omin ,
.Nm omout ,
.Nm pow ,
.Nm rpow ,
.Nm sdiv ,
.Nd multiple precision integer arithmetic
.Sh SYNOPSIS
.Fd #include <mp.h>
.Fd #include <stdio.h>
.Fd "typedef struct mint { int len; short *val; } MINT;"
.Fn madd "MINT *a" "MINT *b" "MINT *c"
.Fn msub "MINT *a" "MINT *b" "MINT *c"
.Fn mult "MINT *a" "MINT *b" "MINT *c"
.Fn mdiv "MINT *a" "MINT *b" "MINT *q" "short r"
.Fn pow "MINT *a" "MINT *b" m "MINT *c"
.Fn gcd "MINT *a" "MINT *b" "MINT *c"
.Fn invert "MINT *a" "MINT *b" "MINT *c"
.Fn rpow "MINT *a" "short n" "MINT *c"
.Fn msqrt "MINT *a" "MINT *b" "short r"
.Fn mcmp "MINT *a" "MINT *b"
.Fn move "MINT *a" "MINT *b"
.Fn min "MINT *a"
.Fn omin "MINT *a"
.Fn fmin "MINT *a" "FILE *f"
.Fn m_in "MINT *a" "int n" "FILE *f"
.Fn mout "MINT *a"
.Fn omout "MINT *a"
.Fn fmout "MINT *a" "FILE *f"
.Fn m_out "MINT *a" "int n" "FILE *f"
.Fn sdiv "MINT *a" "short n" "MINT *q" "short r"
.Fn itom "short n"
.Sh DESCRIPTION
.Bf -symbolic
The interface for this library is expected to change.
.Ef
.Pp
These functions operate on integers of variable length.
The function
.Fn itom
allocates space for an integer of length
.Fa n
which may be accessed via the returned
.Fa MINT
pointer.
The underlying storage scheme is transparent to the user.
.Pp
.Bl -tag -width "mdivXXX" -compact
.It Fn fmin
.It Fn fmout
Convert decimal input and output using file
.Fa f .
.Pp
.It Fn gcd
Finds the greatest common denominator of
.Fa a
and
.Fa b ,
storing the result
in
.Fa c .
.Pp
.It Fn invert
Computes
.Fa c
such that
.Fa a Ns * Fa c No mod
.Fa b
= 1,
for
.Fa a
and
.Fa b
relatively prime.
.Pp
.It Fn m_in
.It Fn m_out
.Tn I/O
with arbitrary radix
.Fa n .
.Pp
.It Fn madd
The sum of
.Fa a
and
.Fa b
is stored in
.Fa c .
.Pp
.It Fn mcmp
Returns a negative, zero or positive integer value when
.Fa a
is less than, equal to or greater than
.Fa b ,
respectively.
.It Fn move
Copies
.Fa a
to
.Fa b .
.Pp
.It Fn min
.It Fn mout
Convert decimal input and output.
.Pp
.It Fn mdiv
Divides
.Fa a
by
.Fa b
and stores the quotient in
.Fa q
and the remainder in
.Fa r .
.Pp
.It Fn msqrt
Calculates the integer square root of
.Fa a
in
.Fa b
and places the remainder in
.Fa r .
.Pp
.It Fn msub
The difference of
.Fa a
and
.Fa b
is stored in
.Fa c .
.Pp
.It Fn mult
The product of
.Fa a
and
.Fa b
is stored in
.Fa c .
.Pp
.It Fn omin
.It Fn omout
Convert octal input and output.
.Pp
.It Fn pow
Calculates
the value of
.Fa a
raised to the
full multiple precision exponent
.Fa b ,
the result is reduced modulo
.Fa m
and stored in
.Fa c .
.Pp
.It Fn rpow
Calculates
the value of
.Fa a
raised to the (``regular'' integral) power
.Fa n
and stores the result in
.Fa c .
.Pp
.It Fn sdiv
(Short divisor.)
Divides
.Fa a
by the short integer
.Fa b
and stores the quotient in
.Fa q
and the remainder in short integer
.Fa r .
On input, records should have the form of
strings of digits terminated by a newline;
output records have a similar form.
.El
.Sh FILES
.Bl -tag -width /usr/include/mp.h -compact
.It Pa /usr/lib/libmp.a
object code library
.It Pa /usr/include/mp.h
include file
.El
.Sh SEE ALSO
.Xr dc 1 ,
.Xr bc 1
.Sh HISTORY
A
.Fn gcd ,
.Fn itom ,
.Fn madd ,
.Fn mdiv ,
.Fn min ,
.Fn mout ,
.Fn msqrt ,
.Fn msub ,
.Fn mult ,
.Fn pow ,
.Fn rpow ,
and
.Fn sdiv
function appeared in
.At v7 .
.\" The rest of the functions appeared in
.\" .Bx ??
.Sh BUGS
Bases for input and output should be <= 10.
.Pp
The interpreters
.Xr dc 1
and
.Xr bc 1
don't use this library.
.Pp
The input and output routines are a crock.
.Pp
The function name
.Fn pow
is also the name of a standard math library routine.