projects / binutils.git / blame
| Commit | Line | Data |
|---|---|---|
| fecd2382 | 1 | /* bignum_copy.c - copy a bignum |
| 01170860 | 2 | Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc. |
| a39116f1 RP |
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 | |
| 8 | the Free Software Foundation; either version 2, or (at your option) | |
| 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 | |
| 3340f7e5 | 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| fecd2382 | 19 | |
| fecd2382 RP |
20 | #include "as.h" |
| 21 | ||
| fecd2382 RP |
22 | /* |
| 23 | * bignum_copy () | |
| 24 | * | |
| 25 | * Copy a bignum from in to out. | |
| 26 | * If the output is shorter than the input, copy lower-order littlenums. | |
| 27 | * Return 0 or the number of significant littlenums dropped. | |
| 28 | * Assumes littlenum arrays are densely packed: no unused chars between | |
| 542e1629 | 29 | * the littlenums. Uses memcpy() to move littlenums, and wants to |
| fecd2382 RP |
30 | * know length (in chars) of the input bignum. |
| 31 | */ | |
| 32 | ||
| 33 | /* void */ | |
| 34 | int | |
| 3340f7e5 RP |
35 | bignum_copy(in, in_length, out, out_length) |
| 36 | register LITTLENUM_TYPE *in; | |
| 37 | register int in_length; /* in sizeof(littlenum)s */ | |
| 38 | register LITTLENUM_TYPE *out; | |
| 39 | register int out_length; /* in sizeof(littlenum)s */ | |
| fecd2382 | 40 | { |
| 3340f7e5 | 41 | int significant_littlenums_dropped; |
| a39116f1 | 42 | |
| 3340f7e5 RP |
43 | if (out_length < in_length) { |
| 44 | LITTLENUM_TYPE *p; /* -> most significant (non-zero) input | |
| 45 | littlenum. */ | |
| 46 | ||
| 542e1629 | 47 | memcpy((void *) out, (void *) in, |
| 3340f7e5 RP |
48 | out_length << LITTLENUM_SHIFT); |
| 49 | for (p = in + in_length - 1; p >= in; --p) { | |
| 50 | if (* p) break; | |
| 51 | } | |
| 52 | significant_littlenums_dropped = p - in - in_length + 1; | |
| 53 | ||
| 54 | if (significant_littlenums_dropped < 0) { | |
| 55 | significant_littlenums_dropped = 0; | |
| 56 | } | |
| 57 | } else { | |
| 542e1629 | 58 | memcpy((char *) out, (char *) in, |
| 3340f7e5 RP |
59 | in_length << LITTLENUM_SHIFT); |
| 60 | ||
| 61 | if (out_length > in_length) { | |
| 542e1629 RP |
62 | memset((char *) (out + out_length), |
| 63 | '\0', (out_length - in_length) << LITTLENUM_SHIFT); | |
| 3340f7e5 RP |
64 | } |
| 65 | ||
| 66 | significant_littlenums_dropped = 0; | |
| 67 | } | |
| 68 | ||
| 69 | return(significant_littlenums_dropped); | |
| 70 | } /* bignum_copy() */ | |
| fecd2382 | 71 | |
| a39116f1 | 72 | /* end of bignum-copy.c */ |