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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "lint.h"
#include "base_conversion.h"
#include <sys/types.h>
#include "libc.h"
char *
fconvert(double arg, int ndigits, int *decpt, int *sign, char *buf)
{
decimal_mode dm;
decimal_record dr;
fp_exception_field_type ef;
int i;
#if defined(__sparc)
dm.rd = _QgetRD();
#elif defined(__i386) || defined(__amd64)
dm.rd = __xgetRD();
#else
#error Unknown architecture
#endif
dm.df = fixed_form; /* F format. */
if (ndigits <= -DECIMAL_STRING_LENGTH)
ndigits = -DECIMAL_STRING_LENGTH + 1;
else if (ndigits >= DECIMAL_STRING_LENGTH)
ndigits = DECIMAL_STRING_LENGTH - 1;
dm.ndigits = ndigits; /* Number of digits after point. */
double_to_decimal(&arg, &dm, &dr, &ef);
*sign = dr.sign;
switch (dr.fpclass) {
case fp_normal:
case fp_subnormal:
*decpt = dr.exponent + dr.ndigits;
for (i = 0; i < dr.ndigits; i++)
buf[i] = dr.ds[i];
/*
* Pad with zeroes if we didn't get all the digits
* we asked for.
*/
if (ndigits > 0 && dr.exponent > -ndigits) {
while (i < dr.ndigits + dr.exponent + ndigits)
buf[i++] = '0';
}
buf[i] = 0;
break;
case fp_zero:
*decpt = 0;
buf[0] = '0';
for (i = 1; i < ndigits; i++)
buf[i] = '0';
buf[i] = 0;
break;
default:
*decpt = 0;
__infnanstring(dr.fpclass, ndigits, buf);
break;
}
return (buf);
}
char *
sfconvert(single *arg, int ndigits, int *decpt, int *sign, char *buf)
{
decimal_mode dm;
decimal_record dr;
fp_exception_field_type ef;
int i;
#if defined(__sparc)
dm.rd = _QgetRD();
#elif defined(__i386) || defined(__amd64)
dm.rd = __xgetRD();
#else
#error Unknown architecture
#endif
dm.df = fixed_form; /* F format. */
if (ndigits <= -DECIMAL_STRING_LENGTH)
ndigits = -DECIMAL_STRING_LENGTH + 1;
else if (ndigits >= DECIMAL_STRING_LENGTH)
ndigits = DECIMAL_STRING_LENGTH - 1;
dm.ndigits = ndigits; /* Number of digits after point. */
single_to_decimal(arg, &dm, &dr, &ef);
*sign = dr.sign;
switch (dr.fpclass) {
case fp_normal:
case fp_subnormal:
*decpt = dr.exponent + dr.ndigits;
for (i = 0; i < dr.ndigits; i++)
buf[i] = dr.ds[i];
/*
* Pad with zeroes if we didn't get all the digits
* we asked for.
*/
if (ndigits > 0 && dr.exponent > -ndigits) {
while (i < dr.ndigits + dr.exponent + ndigits)
buf[i++] = '0';
}
buf[i] = 0;
break;
case fp_zero:
*decpt = 0;
buf[0] = '0';
for (i = 1; i < ndigits; i++)
buf[i] = '0';
buf[i] = 0;
break;
default:
*decpt = 0;
__infnanstring(dr.fpclass, ndigits, buf);
break;
}
return (buf);
}
char *
qfconvert(quadruple *arg, int ndigits, int *decpt, int *sign, char *buf)
{
decimal_mode dm;
decimal_record dr;
fp_exception_field_type ef;
int i;
#if defined(__sparc)
dm.rd = _QgetRD();
#elif defined(__i386) || defined(__amd64)
dm.rd = __xgetRD();
#else
#error Unknown architecture
#endif
dm.df = fixed_form; /* F format. */
if (ndigits <= -DECIMAL_STRING_LENGTH)
ndigits = -DECIMAL_STRING_LENGTH + 1;
else if (ndigits >= DECIMAL_STRING_LENGTH)
ndigits = DECIMAL_STRING_LENGTH - 1;
dm.ndigits = ndigits; /* Number of digits after point. */
#if defined(__sparc)
quadruple_to_decimal(arg, &dm, &dr, &ef);
#elif defined(__i386) || defined(__amd64)
extended_to_decimal((extended *)arg, &dm, &dr, &ef);
#else
#error Unknown architecture
#endif
*sign = dr.sign;
if (ef & (1 << fp_overflow)) {
/*
* *_to_decimal raises overflow whenever dr.ds isn't large
* enough to hold all the digits requested. For float and
* double, this can only happen when the requested format
* would require trailing zeroes, in which case fconvert
* and sfconvert just add them. For long double, the arg-
* ument might be large enough that even the nonzero digits
* would overflow dr.ds, so we punt instead. (We could
* distinguish these two cases, but it doesn't seem worth
* changing things now, particularly since no real appli-
* cation prints floating point numbers to 500 digits.)
*/
*decpt = 0;
buf[0] = 0;
return (buf);
}
switch (dr.fpclass) {
case fp_normal:
case fp_subnormal:
*decpt = dr.exponent + dr.ndigits;
for (i = 0; i < dr.ndigits; i++)
buf[i] = dr.ds[i];
buf[i] = 0;
break;
case fp_zero:
*decpt = 0;
buf[0] = '0';
for (i = 1; i < ndigits; i++)
buf[i] = '0';
buf[i] = 0;
break;
default:
*decpt = 0;
__infnanstring(dr.fpclass, ndigits, buf);
break;
}
return (buf);
}
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