| 1 | /* bignum_copy.c - copy a bignum
|
|---|
| 2 | Copyright 1987, 1990, 1991, 1992, 1993, 2000
|
|---|
| 3 | Free Software Foundation, Inc.
|
|---|
| 4 |
|
|---|
| 5 | This file is part of GAS, the GNU Assembler.
|
|---|
| 6 |
|
|---|
| 7 | GAS is free software; you can redistribute it and/or modify
|
|---|
| 8 | it under the terms of the GNU General Public License as published by
|
|---|
| 9 | the Free Software Foundation; either version 2, or (at your option)
|
|---|
| 10 | any later version.
|
|---|
| 11 |
|
|---|
| 12 | GAS is distributed in the hope that it will be useful,
|
|---|
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|---|
| 15 | GNU General Public License for more details.
|
|---|
| 16 |
|
|---|
| 17 | You should have received a copy of the GNU General Public License
|
|---|
| 18 | along with GAS; see the file COPYING. If not, write to
|
|---|
| 19 | the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|---|
| 20 |
|
|---|
| 21 | #include "as.h"
|
|---|
| 22 |
|
|---|
| 23 | /*
|
|---|
| 24 | * bignum_copy ()
|
|---|
| 25 | *
|
|---|
| 26 | * Copy a bignum from in to out.
|
|---|
| 27 | * If the output is shorter than the input, copy lower-order littlenums.
|
|---|
| 28 | * Return 0 or the number of significant littlenums dropped.
|
|---|
| 29 | * Assumes littlenum arrays are densely packed: no unused chars between
|
|---|
| 30 | * the littlenums. Uses memcpy() to move littlenums, and wants to
|
|---|
| 31 | * know length (in chars) of the input bignum.
|
|---|
| 32 | */
|
|---|
| 33 |
|
|---|
| 34 | /* void */
|
|---|
| 35 | int
|
|---|
| 36 | bignum_copy (in, in_length, out, out_length)
|
|---|
| 37 | register LITTLENUM_TYPE *in;
|
|---|
| 38 | register int in_length; /* in sizeof(littlenum)s */
|
|---|
| 39 | register LITTLENUM_TYPE *out;
|
|---|
| 40 | register int out_length; /* in sizeof(littlenum)s */
|
|---|
| 41 | {
|
|---|
| 42 | int significant_littlenums_dropped;
|
|---|
| 43 |
|
|---|
| 44 | if (out_length < in_length)
|
|---|
| 45 | {
|
|---|
| 46 | LITTLENUM_TYPE *p; /* -> most significant (non-zero) input
|
|---|
| 47 | littlenum. */
|
|---|
| 48 |
|
|---|
| 49 | memcpy ((void *) out, (void *) in,
|
|---|
| 50 | (unsigned int) out_length << LITTLENUM_SHIFT);
|
|---|
| 51 | for (p = in + in_length - 1; p >= in; --p)
|
|---|
| 52 | {
|
|---|
| 53 | if (*p)
|
|---|
| 54 | break;
|
|---|
| 55 | }
|
|---|
| 56 | significant_littlenums_dropped = p - in - in_length + 1;
|
|---|
| 57 |
|
|---|
| 58 | if (significant_littlenums_dropped < 0)
|
|---|
| 59 | {
|
|---|
| 60 | significant_littlenums_dropped = 0;
|
|---|
| 61 | }
|
|---|
| 62 | }
|
|---|
| 63 | else
|
|---|
| 64 | {
|
|---|
| 65 | memcpy ((char *) out, (char *) in,
|
|---|
| 66 | (unsigned int) in_length << LITTLENUM_SHIFT);
|
|---|
| 67 |
|
|---|
| 68 | if (out_length > in_length)
|
|---|
| 69 | {
|
|---|
| 70 | memset ((char *) (out + in_length),
|
|---|
| 71 | '\0',
|
|---|
| 72 | (unsigned int) (out_length - in_length) << LITTLENUM_SHIFT);
|
|---|
| 73 | }
|
|---|
| 74 |
|
|---|
| 75 | significant_littlenums_dropped = 0;
|
|---|
| 76 | }
|
|---|
| 77 |
|
|---|
| 78 | return (significant_littlenums_dropped);
|
|---|
| 79 | } /* bignum_copy() */
|
|---|
| 80 |
|
|---|
| 81 | /* end of bignum-copy.c */
|
|---|
