'\" te
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.TH FLOATINGPOINT.H 3HEAD "Mar 5, 1993"
.SH NAME
floatingpoint.h, floatingpoint \- IEEE floating point definitions
.SH SYNOPSIS
.LP
.nf
#include <floatingpoint.h>
.fi

.SH DESCRIPTION
.sp
.LP
This file defines constants, types, and functions used to implement standard
floating point according to ANSI/IEEE Std 754-1985. The functions are
implemented in \fBlibc\fR. The included header file <\fBsys/ieeefp.h\fR>
defines certain types of interest to the kernel.
.SS "IEEE Rounding Modes"
.sp
.ne 2
.na
\fB\fBfp_direction_type\fR\fR
.ad
.RS 23n
The type of the IEEE rounding direction mode. Note: the order of enumeration
varies according to hardware.
.RE

.sp
.ne 2
.na
\fB\fBfp_precision_type\fR\fR
.ad
.RS 23n
The type of the IEEE rounding precision mode, which only applies on systems
that support extended precision such as machines based on the Intel 80387 FPU
or the 80486. \fBSIGFPE\fR handling:
.RE

.sp
.ne 2
.na
\fB\fBsigfpe_code_type\fR\fR
.ad
.RS 23n
The type of a \fBSIGFPE\fR code.
.RE

.sp
.ne 2
.na
\fB\fBsigfpe_handler_type\fR\fR
.ad
.RS 23n
The type of a user-definable \fBSIGFPE\fR exception handler called to handle a
particular \fBSIGFPE\fR code.
.RE

.sp
.ne 2
.na
\fB\fBSIGFPE_DEFAULT\fR \fR
.ad
.RS 23n
A macro indicating the default \fBSIGFPE\fR exception handling, namely to
perform the exception handling specified by the user, if any, and otherwise to
dump core using \fBabort\fR(3C).
.RE

.sp
.ne 2
.na
\fB\fBSIGFPE_IGNORE\fR \fR
.ad
.RS 23n
A macro indicating an alternate \fBSIGFPE\fR exception handling, namely to
ignore and continue execution.
.RE

.sp
.ne 2
.na
\fB\fBSIGFPE_ABORT\fR \fR
.ad
.RS 23n
A macro indicating an alternate \fBSIGFPE\fR exception handling, namely to
abort with a core dump.
.RE

.SS "IEEE Exception Handling"
.sp
.ne 2
.na
\fB\fBN_IEEE_EXCEPTION\fR \fR
.ad
.RS 27n
The number of distinct IEEE floating-point exceptions.
.RE

.sp
.ne 2
.na
\fB\fBfp_exception_type\fR\fR
.ad
.RS 27n
The type of the \fBN_IEEE_EXCEPTION\fR exceptions.  Each exception is given a
bit number.
.RE

.sp
.ne 2
.na
\fB\fBfp_exception_field_type\fR\fR
.ad
.RS 27n
The type intended to hold at least \fBN_IEEE_EXCEPTION\fR bits corresponding to
the IEEE exceptions numbered by \fBfp_exception_type\fR. Thus \fBfp_inexact\fR
corresponds to the least significant bit and \fBfp_invalid\fR to the fifth
least significant bit. Note: some operations may set more than one exception.
.RE

.SS "IEEE Formats and Classification"
.sp
.ne 2
.na
\fB\fBsingle\fR;\|\fBextended\fR;\|\fBquadruple\fR\fR
.ad
.sp .6
.RS 4n
Definitions of IEEE formats.
.RE

.sp
.ne 2
.na
\fB\fBfp_class_type\fR\fR
.ad
.sp .6
.RS 4n
An enumeration of the various classes of IEEE values and symbols.
.RE

.SS "IEEE Base Conversion"
.sp
.LP
The functions described under \fBfloating_to_decimal\fR(3C) and
\fBdecimal_to_floating\fR(3C) satisfy not only the \fBIEEE\fR Standard, but
also the stricter requirements of correct rounding for all arguments.
.sp
.ne 2
.na
\fB\fBDECIMAL_STRING_LENGTH\fR \fR
.ad
.RS 26n
The length of a \fBdecimal_string\fR.
.RE

.sp
.ne 2
.na
\fB\fBdecimal_string\fR\fR
.ad
.RS 26n
The digit buffer in a \fBdecimal_record\fR.
.RE

.sp
.ne 2
.na
\fB\fBdecimal_record\fR\fR
.ad
.RS 26n
The canonical form for representing an unpacked decimal floating-point number.
.RE

.sp
.ne 2
.na
\fB\fBdecimal_form\fR\fR
.ad
.RS 26n
The type used to specify fixed or floating binary to decimal conversion.
.RE

.sp
.ne 2
.na
\fB\fBdecimal_mode\fR\fR
.ad
.RS 26n
A struct that contains specifications for conversion between binary and
decimal.
.RE

.sp
.ne 2
.na
\fB\fBdecimal_string_form\fR\fR
.ad
.RS 26n
An enumeration of possible valid character strings representing floating-point
numbers, infinities, or NaNs.
.RE

.SH FILES
.sp
.LP
\fB/usr/include/sys/ieeefp.h\fR
.SH SEE ALSO
.sp
.LP
\fBabort\fR(3C), \fBdecimal_to_floating\fR(3C), \fBeconvert\fR(3C),
\fBfloating_to_decimal\fR(3C), \fBsigfpe\fR(3C), \fBstring_to_decimal\fR(3C),
\fBstrtod\fR(3C)