projects / binutils.git / blame
| Commit | Line | Data |
|---|---|---|
| fecd2382 RP |
1 | /* bignum_copy.c - copy a bignum |
| 2 | Copyright (C) 1987, 1990, 1991 Free Software Foundation, Inc. | |
| 3 | ||
| 4 | This file is part of GAS, the GNU Assembler. | |
| 5 | ||
| 6 | GAS is free software; you can redistribute it and/or modify | |
| 7 | it under the terms of the GNU General Public License as published by | |
| 6026cd06 | 8 | the Free Software Foundation; either version 2, or (at your option) |
| fecd2382 RP |
9 | any later version. |
| 10 | ||
| 11 | GAS is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | GNU General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU General Public License | |
| 17 | along with GAS; see the file COPYING. If not, write to | |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
| 19 | ||
| 20 | /* static const char rcsid[] = "$Id$"; */ | |
| 21 | ||
| 22 | #include "as.h" | |
| 23 | ||
| 24 | #ifdef USG | |
| 25 | #define bzero(s,n) memset(s,0,n) | |
| 26 | #define bcopy(from,to,n) memcpy(to,from,n) | |
| 27 | #endif | |
| 28 | ||
| 29 | /* | |
| 30 | * bignum_copy () | |
| 31 | * | |
| 32 | * Copy a bignum from in to out. | |
| 33 | * If the output is shorter than the input, copy lower-order littlenums. | |
| 34 | * Return 0 or the number of significant littlenums dropped. | |
| 35 | * Assumes littlenum arrays are densely packed: no unused chars between | |
| 36 | * the littlenums. Uses bcopy() to move littlenums, and wants to | |
| 37 | * know length (in chars) of the input bignum. | |
| 38 | */ | |
| 39 | ||
| 40 | /* void */ | |
| 41 | int | |
| 42 | bignum_copy (in, in_length, out, out_length) | |
| 43 | register LITTLENUM_TYPE * in; | |
| 44 | register int in_length; /* in sizeof(littlenum)s */ | |
| 45 | register LITTLENUM_TYPE * out; | |
| 46 | register int out_length; /* in sizeof(littlenum)s */ | |
| 47 | { | |
| 48 | register int significant_littlenums_dropped; | |
| 49 | ||
| 50 | if (out_length < in_length) | |
| 51 | { | |
| 52 | register LITTLENUM_TYPE * p; /* -> most significant (non-zero) input littlenum. */ | |
| 53 | ||
| 54 | bcopy ((char *)in, (char *)out, out_length << LITTLENUM_SHIFT); | |
| 55 | for (p = in + in_length - 1; p >= in; -- p) | |
| 56 | { | |
| 57 | if (* p) break; | |
| 58 | } | |
| 59 | significant_littlenums_dropped = p - in - in_length + 1; | |
| 60 | if (significant_littlenums_dropped < 0) | |
| 61 | { | |
| 62 | significant_littlenums_dropped = 0; | |
| 63 | } | |
| 64 | } | |
| 65 | else | |
| 66 | { | |
| 67 | bcopy ((char *)in, (char *)out, in_length << LITTLENUM_SHIFT); | |
| 68 | if (out_length > in_length) | |
| 69 | { | |
| 70 | bzero ((char *)(out + out_length), (out_length - in_length) << LITTLENUM_SHIFT); | |
| 71 | } | |
| 72 | significant_littlenums_dropped = 0; | |
| 73 | } | |
| 74 | return (significant_littlenums_dropped); | |
| 75 | } | |
| 76 | ||
| 77 | /* end: bignum_copy.c */ |