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Added _isnan(), _isinf(), __dtoa(), fcvt(), and ecvt() routines. The
first three are required by stdio.
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gdr
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@ -1,11 +1,18 @@
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#
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# $Id: Makefile,v 1.1 1997/02/28 05:12:49 gdr Exp $
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# gno/lib/libc/stdlib/Makefile
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#
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# Devin Reade, 1997
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#
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# $Id: Makefile,v 1.2 1997/09/05 06:31:58 gdr Exp $
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#
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.INCLUDE: ../../../paths.mk
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.INCLUDE: ../../const.mk
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OBJS = environ.o getopt.o getsubopt.o
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OBJS = cvt.o environ.o fpspecnum.o getopt.o getsubopt.o
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default: $(OBJS)
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.INCLUDE: ../rules.mk
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fpspecnum.o:: fpspecnum.mac
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136
lib/libc/stdlib/cvt.c
Normal file
136
lib/libc/stdlib/cvt.c
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@ -0,0 +1,136 @@
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/*
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* Floating point conversion routines.
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* Devin Reade, 1997.
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*
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* $Id: cvt.c,v 1.1 1997/09/05 06:31:59 gdr Exp $
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*
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* This file is formatted with tab stops every 8 columns.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <sane.h>
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#include <math.h>
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char *
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ecvt (double number, size_t ndigits, int *decpt, int *sign)
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{
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static DecForm convert;
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static Decimal d;
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convert.style = FLOATDECIMAL;
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if (ndigits > SIGDIGLEN) {
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ndigits = SIGDIGLEN;
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}
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convert.digits = ndigits;
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s_num2dec(&convert, number, &d);
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*decpt = (int)d.sig.length + d.exp;
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*sign = d.sgn;
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*(d.sig.text + (int)d.sig.length) = '\0'; /* depends on d.sig.unused */
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return d.sig.text;
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}
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char *
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fcvt (double number, size_t ndigits, int *decpt, int *sign)
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{
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static DecForm convert;
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static Decimal d;
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convert.style = FIXEDDECIMAL;
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if (ndigits > SIGDIGLEN) {
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ndigits = SIGDIGLEN;
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}
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convert.digits = ndigits;
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s_num2dec(&convert, number, &d);
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*decpt = (int)d.sig.length + d.exp;
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*sign = d.sgn;
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*(d.sig.text + (int)d.sig.length) = '\0'; /* depends on d.sig.unused */
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return d.sig.text;
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}
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/* __dtoa: These are the comments from the BSD implementation of
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this routine. Whether or not we have achieved compatibility
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remains to be seen.
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Arguments ndigits, decpt, sign are similar to those
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of ecvt and fcvt; trailing zeros are suppressed from
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the returned string. If not null, *rve is set to point
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to the end of the return value. If d is +-Infinity or NaN,
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then *decpt is set to 9999.
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mode:
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0 ==> shortest string that yields d when read in
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and rounded to nearest.
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1 ==> like 0, but with Steele & White stopping rule;
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e.g. with IEEE P754 arithmetic , mode 0 gives
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1e23 whereas mode 1 gives 9.999999999999999e22.
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2 ==> max(1,ndigits) significant digits. This gives a
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return value similar to that of ecvt, except
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that trailing zeros are suppressed.
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3 ==> through ndigits past the decimal point. This
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gives a return value similar to that from fcvt,
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except that trailing zeros are suppressed, and
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ndigits can be negative.
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4-9 should give the same return values as 2-3, i.e.,
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4 <= mode <= 9 ==> same return as mode
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2 + (mode & 1). These modes are mainly for
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debugging; often they run slower but sometimes
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faster than modes 2-3.
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4,5,8,9 ==> left-to-right digit generation.
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6-9 ==> don't try fast floating-point estimate
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(if applicable).
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Values of mode other than 0-9 are treated as mode 0.
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Sufficient space is allocated to the return value
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to hold the suppressed trailing zeros.
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*/
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#undef MAX
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#define MAX(a,b) (((a) > (b)) ? (a) : (b))
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char *
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__dtoa (double number, int mode, int ndigits, int *decpt, int *sign,
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char **rve)
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{
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char *result, *p;
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switch(mode) {
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case 2:
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case 4:
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case 6:
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case 8:
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mode0: /* this label doesn't belong here */
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result = ecvt(number, MAX(1, ndigits), decpt, sign);
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break;
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case 3:
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case 5:
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case 7:
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case 9:
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result = fcvt(number, ndigits, decpt, sign);
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break;
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case 0:
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case 1:
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default:
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goto mode0; /* TEMP KLUDGE */
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}
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/* truncate trailing zeros */
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p = result;
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while (*p) p++;
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p--;
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while ((p > result) && (*p == '0')) {
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*p-- = '\0';
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}
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if (rve != NULL) {
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*rve = p + 1;
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}
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/* set decimal point for NaNs and Infinities */
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if (isnan(number) || isinf(number)) {
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*decpt = 9999;
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}
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return result;
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}
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107
lib/libc/stdlib/fpspecnum.asm
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107
lib/libc/stdlib/fpspecnum.asm
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@ -0,0 +1,107 @@
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*
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* Test an extended to see whether it is NaN or INF
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*
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* $Id: fpspecnum.asm,v 1.1 1997/09/05 06:31:59 gdr Exp $
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*
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* Soenke Behrens, August 1997
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*
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case on
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mcopy fpspecnum.mac
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*
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* Dummy function to take care of fpspecnum.root, which
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* can then be discarded.
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*
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dummy start
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copy :lib:ainclude:e16.sane ; Apple-supplied SANE EQUs
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end
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****************************************************************
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*
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* int _isnan (extended x);
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*
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* Check whether x is NaN, if so, return 1, otherwise, return 0.
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*
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****************************************************************
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*
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_isnan start libc_stdlib
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result equ 1
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space equ result+2
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csub (10:x),space
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short m clear the specific NaN code
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stz x+6
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long m
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lda x and do the compare
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cmp nan_x
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bne diff
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lda x+2
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cmp nan_x+2
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bne diff
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lda x+4
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cmp nan_x+4
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bne diff
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lda x+6
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cmp nan_x+6
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bne diff
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lda x+8
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cmp nan_x+8
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bne diff
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lda #1
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sta result
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bra bye
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diff stz result
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bye ret (2:result)
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nan_x dc h'0000000000000040FF7F' ; Hex encoding of a NaN
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end
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****************************************************************
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*
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* int _isinf (extended x);
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*
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* Check whether x is INF, if so, return 1, otherwise, return 0.
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*
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****************************************************************
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*
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_isinf start libc_stdlib
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result equ 1
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space equ result+2
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csub (10:x),space
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short m
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lda x+9 get rid of sign bit
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and #%01111111
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sta x+9
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long m
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lda x and do the compare
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cmp inf_x
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bne diff
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lda x+2
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cmp inf_x+2
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bne diff
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lda x+4
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cmp inf_x+4
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bne diff
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lda x+6
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cmp inf_x+6
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bne diff
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lda x+8
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cmp inf_x+8
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bne diff
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lda #1
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sta result
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bra bye
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diff stz result
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bye ret (2:result)
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inf_x dc h'0000000000000000FF7F' ; Hex encoding of +INF
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end
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133
lib/libc/stdlib/fpspecnum.mac
Normal file
133
lib/libc/stdlib/fpspecnum.mac
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@ -0,0 +1,133 @@
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macro
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&l csub &parms,&work
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&l anop
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aif c:&work,.a
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lclc &work
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&work setc 0
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.a
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gbla &totallen
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gbla &worklen
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&worklen seta &work
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&totallen seta 0
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aif c:&parms=0,.e
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lclc &len
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lclc &p
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lcla &i
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&i seta 1
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.b
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&p setc &parms(&i)
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&len amid &p,2,1
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aif "&len"=":",.c
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&len amid &p,1,2
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&p amid &p,4,l:&p-3
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ago .d
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.c
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&len amid &p,1,1
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&p amid &p,3,l:&p-2
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.d
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&p equ &totallen+4+&work
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&totallen seta &totallen+&len
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&i seta &i+1
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aif &i<=c:&parms,^b
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.e
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tsc
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aif &work=0,.f
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sec
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sbc #&work
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tcs
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.f
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phd
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tcd
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mend
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macro
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&l ret &r
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&l anop
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lclc &len
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aif c:&r,.a
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lclc &r
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&r setc 0
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&len setc 0
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ago .h
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.a
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&len amid &r,2,1
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aif "&len"=":",.b
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&len amid &r,1,2
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&r amid &r,4,l:&r-3
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ago .c
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.b
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&len amid &r,1,1
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&r amid &r,3,l:&r-2
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.c
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aif &len<>2,.d
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ldy &r
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ago .h
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.d
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aif &len<>4,.e
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ldx &r+2
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ldy &r
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ago .h
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.e
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aif &len<>10,.g
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ldy #&r
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ldx #^&r
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ago .h
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.g
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mnote 'Not a valid return length',16
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mexit
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.h
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aif &totallen=0,.i
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lda &worklen+2
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sta &worklen+&totallen+2
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lda &worklen+1
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sta &worklen+&totallen+1
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.i
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pld
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tsc
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clc
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adc #&worklen+&totallen
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tcs
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aif &len=0,.j
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tya
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.j
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rtl
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mend
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macro
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&l long &a,&b
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lclb &i
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lclb &m
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&a amid &a,1,1
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&m setb ("&a"="M").or.("&a"="m")
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&i setb ("&a"="I").or.("&a"="i")
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aif c:&b=0,.a
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&b amid &b,1,1
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&m setb ("&b"="M").or.("&b"="m").or.&m
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&i setb ("&b"="I").or.("&b"="i").or.&i
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.a
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&l rep #&m*32+&i*16
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aif .not.&m,.b
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longa on
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.b
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aif .not.&i,.c
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longi on
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.c
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mend
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macro
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&l short &a,&b
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lclb &i
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lclb &m
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&a amid &a,1,1
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&m setb ("&a"="M").or.("&a"="m")
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&i setb ("&a"="I").or.("&a"="i")
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aif c:&b=0,.a
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&b amid &b,1,1
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&m setb ("&b"="M").or.("&b"="m").or.&m
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&i setb ("&b"="I").or.("&b"="i").or.&i
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.a
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&l sep #&m*32+&i*16
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aif .not.&m,.b
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longa off
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.b
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aif .not.&i,.c
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longi off
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.c
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mend
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