1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/* bignum_copy.c - copy a bignum
|
|
Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc.
|
|
|
|
This file is part of GAS, the GNU Assembler.
|
|
|
|
GAS is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GAS is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GAS; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
#ifndef lint
|
|
static char rcsid[] = "$FreeBSD$";
|
|
#endif
|
|
|
|
#include "as.h"
|
|
|
|
/*
|
|
* bignum_copy ()
|
|
*
|
|
* Copy a bignum from in to out.
|
|
* If the output is shorter than the input, copy lower-order littlenums.
|
|
* Return 0 or the number of significant littlenums dropped.
|
|
* Assumes littlenum arrays are densely packed: no unused chars between
|
|
* the littlenums. Uses memcpy() to move littlenums, and wants to
|
|
* know length (in chars) of the input bignum.
|
|
*/
|
|
|
|
/* void */
|
|
int
|
|
bignum_copy(in, in_length, out, out_length)
|
|
register LITTLENUM_TYPE *in;
|
|
register int in_length; /* in sizeof(littlenum)s */
|
|
register LITTLENUM_TYPE *out;
|
|
register int out_length; /* in sizeof(littlenum)s */
|
|
{
|
|
int significant_littlenums_dropped;
|
|
|
|
if (out_length < in_length) {
|
|
LITTLENUM_TYPE *p; /* -> most significant (non-zero) input
|
|
littlenum. */
|
|
|
|
memcpy((void *) out, (void *) in,
|
|
out_length << LITTLENUM_SHIFT);
|
|
for (p = in + in_length - 1; p >= in; --p) {
|
|
if (* p) break;
|
|
}
|
|
significant_littlenums_dropped = p - in - in_length + 1;
|
|
|
|
if (significant_littlenums_dropped < 0) {
|
|
significant_littlenums_dropped = 0;
|
|
}
|
|
} else {
|
|
memcpy((char *) out, (char *) in,
|
|
in_length << LITTLENUM_SHIFT);
|
|
|
|
if (out_length > in_length) {
|
|
memset((char *) (out + out_length),
|
|
'\0', (out_length - in_length) << LITTLENUM_SHIFT);
|
|
}
|
|
|
|
significant_littlenums_dropped = 0;
|
|
}
|
|
|
|
return(significant_littlenums_dropped);
|
|
} /* bignum_copy() */
|
|
|
|
/* end of bignum-copy.c */
|