mirror of
https://github.com/gravitational/teleport.git
synced 2026-09-21 14:12:20 +08:00
Alan Parra
a75fcc21d8
Update metalinter, fix a few lint warnings and replace deprecated linters. `deadcode`, `structcheck` and `varcheck` are abandoned and now replaced by [`unused`][1]. Since 1.19, `go fmt` reformats godocs according to https://go.dev/doc/comment. I've done a bulk-reformatting of the codebase to keep the linter happy. Backporting is mostly harmless (the exception being `lib/services/role_test.go`, that for some reason breaks the _old_ linter using the new format). [1]: https://golangci-lint.run/usage/linters/ * Bump golangci-lint version * Replace abandoned linters * Fix bodyclose on lib/auth/github.com * Fix bodyclose on lib/kube/proxy/streamproto/proto_test.go * Fix bodyclose on lib/srv/alpnproxy/proxy_test.go * Fix bodyclose on lib/web/conn_upgrade_test.go * Silence staticcheck on lib/kube/proxy/forwarder_test.go * Silence staticcheck on lib/utils/certs_test.go * Address BuildNameToCertificate deprecation warnings * Run `go fmt ./...` * Run `go fmt ./...` on api/ * Ignore formatting in role_test.go * Remove redundant initializers in lib/srv/uacc/ * Update e/
60 lines
1.4 KiB
Go
60 lines
1.4 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package utils
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import (
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"math"
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)
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const (
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uvone = 0x3FF0000000000000
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mask = 0x7FF
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shift = 64 - 11 - 1
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bias = 1023
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signMask = 1 << 63
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fracMask = 1<<shift - 1
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)
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// Round returns the nearest integer, rounding half away from zero.
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//
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// Special cases are:
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//
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// Round(±0) = ±0
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// Round(±Inf) = ±Inf
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// Round(NaN) = NaN
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//
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// Note: Copied from Go standard library to support Go 1.9.7 releases. This
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// function was added in the standard library in Go 1.10.
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func Round(x float64) float64 {
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// Round is a faster implementation of:
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//
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// func Round(x float64) float64 {
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// t := Trunc(x)
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// if Abs(x-t) >= 0.5 {
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// return t + Copysign(1, x)
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// }
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// return t
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// }
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bits := math.Float64bits(x)
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e := uint(bits>>shift) & mask
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if e < bias {
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// Round abs(x) < 1 including denormals.
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bits &= signMask // +-0
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if e == bias-1 {
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bits |= uvone // +-1
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}
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} else if e < bias+shift {
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// Round any abs(x) >= 1 containing a fractional component [0,1).
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//
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// Numbers with larger exponents are returned unchanged since they
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// must be either an integer, infinity, or NaN.
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const half = 1 << (shift - 1)
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e -= bias
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bits += half >> e
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bits &^= fracMask >> e
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}
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return math.Float64frombits(bits)
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}
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