Adding upstream version 4.22.0.upstream/4.22.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+'\" t
+.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.\" References consulted:
+.\"     Linux libc source code
+.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
+.\"     386BSD man pages
+.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
+.\" Modified 2002-07-27 by Walter Harms
+.\" 	(walter.harms@informatik.uni-oldenburg.de)
+.\"
+.TH hypot 3 2023-03-30 "Linux man-pages 6.04"
+.SH NAME
+hypot, hypotf, hypotl \- Euclidean distance function
+.SH LIBRARY
+Math library
+.RI ( libm ", " \-lm )
+.SH SYNOPSIS
+.nf
+.B #include <math.h>
+.PP
+.BI "double hypot(double " x ", double " y );
+.BI "float hypotf(float " x ", float " y );
+.BI "long double hypotl(long double " x ", long double " y );
+.fi
+.PP
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.PP
+.BR hypot ():
+.nf
+    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
+        || _XOPEN_SOURCE
+        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
+        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
+.fi
+.PP
+.BR hypotf (),
+.BR hypotl ():
+.nf
+    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
+        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
+        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
+.fi
+.SH DESCRIPTION
+These functions return
+.RI sqrt( x * x + y * y ).
+This is the length of the hypotenuse of a right-angled triangle
+with sides of length
+.I x
+and
+.IR y ,
+or the distance of the point
+.RI ( x , y )
+from the origin.
+.PP
+The calculation is performed without undue overflow or underflow
+during the intermediate steps of the calculation.
+.\" e.g., hypot(DBL_MIN, DBL_MIN) does the right thing, as does, say
+.\" hypot(DBL_MAX/2.0, DBL_MAX/2.0).
+.SH RETURN VALUE
+On success, these functions return the length of the hypotenuse of
+a right-angled triangle
+with sides of length
+.I x
+and
+.IR y .
+.PP
+If
+.I x
+or
+.I y
+is an infinity,
+positive infinity is returned.
+.PP
+If
+.I x
+or
+.I y
+is a NaN,
+and the other argument is not an infinity,
+a NaN is returned.
+.PP
+If the result overflows,
+a range error occurs,
+and the functions return
+.BR HUGE_VAL ,
+.BR HUGE_VALF ,
+or
+.BR HUGE_VALL ,
+respectively.
+.PP
+If both arguments are subnormal, and the result is subnormal,
+.\" Actually, could the result not be subnormal if both arguments
+.\" are subnormal?  I think not -- mtk, Jul 2008
+a range error occurs,
+and the correct result is returned.
+.SH ERRORS
+See
+.BR math_error (7)
+for information on how to determine whether an error has occurred
+when calling these functions.
+.PP
+The following errors can occur:
+.TP
+Range error: result overflow
+.I errno
+is set to
+.BR ERANGE .
+An overflow floating-point exception
+.RB ( FE_OVERFLOW )
+is raised.
+.TP
+Range error: result underflow
+An underflow floating-point exception
+.RB ( FE_UNDERFLOW )
+is raised.
+.IP
+These functions do not set
+.I errno
+for this case.
+.\" This is intentional; see
+.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=6795
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.ad l
+.nh
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.BR hypot (),
+.BR hypotf (),
+.BR hypotl ()
+T}	Thread safety	MT-Safe
+.TE
+.hy
+.ad
+.sp 1
+.SH STANDARDS
+C11, POSIX.1-2008.
+.SH HISTORY
+C99, POSIX.1-2001.
+.PP
+The variant returning
+.I double
+also conforms to
+SVr4, 4.3BSD.
+.SH SEE ALSO
+.BR cabs (3),
+.BR sqrt (3)