94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/*
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* Header file for decimal.c (arbitrary precision decimal arithmetic)
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*
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* Copyright (C) 1984 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can either send email to this
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* program's author (see below) or write to: The Free Software Foundation,
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* Inc.; 675 Mass Ave. Cambridge, MA 02139, USA.
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*/
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/* Autoconf stuff */
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#ifndef HAVE_BCOPY
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#undef bcopy
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#define bcopy(s2, s1, n) memcpy (s1, s2, n)
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#endif
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#ifndef HAVE_BZERO
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#undef bzero
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#define bzero(b, l) memset (b, 0, l)
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#endif
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/* Define the radix to use by default, and for representing the
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numbers internally. This does not need to be decimal; that is just
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the default for it. */
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/* Currently, this is required to be even for this program to work. */
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#ifndef RADIX
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#define RADIX 10
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#endif
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/* The user must define the external function `decimal_error'
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which is called with two arguments to report errors in this package.
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The two arguments may be passed to `printf' to print a message. */
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/* Structure that represents a decimal number */
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struct decimal
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{
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unsigned int sign: 1; /* One for negative number */
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/* The sign should always be zero for the number 0 */
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int after: 15; /* number of fraction digits */
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unsigned short before; /* number of non-fraction digits */
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unsigned short refcnt; /* number of pointers to this number */
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/* (used by calling program) */
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char contents[1]; /* the digits themselves, least significant first. */
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/* digits are just numbers 0 .. RADIX-1 */
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};
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/* There may never be leading nonfraction zeros or trailing fraction
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zeros in a number. They must be removed by all the arithmetic
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functions. Therefore, the number zero always has no digits stored. */
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typedef struct decimal *decimal;
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/* Decimal numbers are always passed around as pointers.
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All the external entries in this file allocate new numbers
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using `malloc' to store values in.
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They never modify their arguments or any existing numbers. */
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/* Return the total number of digits stored in the number `b' */
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#define LENGTH(b) ((b)->before + (b)->after)
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/* Some constant decimal numbers */
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#define DECIMAL_ZERO &decimal_zero
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#define DECIMAL_ONE &decimal_one
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#define DECIMAL_HALF &decimal_half
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decimal decimal_add (), decimal_sub (), decimal_mul (), decimal_div ();
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decimal decimal_mul_dc (), decimal_mul_rounded (), decimal_rem ();
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decimal decimal_round_digits (), decimal_trunc_digits ();
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decimal make_decimal (), decimal_copy (), decimal_parse ();
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decimal decimal_sqrt (), decimal_expt ();
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void decimal_print ();
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/* End of decimal.h */
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