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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package abi
import (
"fmt"
"math"
"strconv"
"strings"
)
// A FlagSet is a slice of bit-flags and their name.
type FlagSet []struct {
Flag uint64
Name string
}
// Parse returns a pretty version of val, using the flag names for known flags.
// Unknown flags remain numeric.
func (s FlagSet) Parse(val uint64) string {
var flags []string
for _, f := range s {
if val&f.Flag == f.Flag {
flags = append(flags, f.Name)
val &^= f.Flag
}
}
if val != 0 {
flags = append(flags, "0x"+strconv.FormatUint(val, 16))
}
if len(flags) == 0 {
// Prefer 0 to an empty string.
return "0x0"
}
return strings.Join(flags, "|")
}
// ValueSet is a map of syscall values to their name. Parse will use the name
// or the value if unknown.
type ValueSet map[uint64]string
// Parse returns the name of the value associated with `val`. Unknown values
// are converted to hex.
func (s ValueSet) Parse(val uint64) string {
if v, ok := s[val]; ok {
return v
}
return fmt.Sprintf("%#x", val)
}
// ParseDecimal returns the name of the value associated with `val`. Unknown
// values are converted to decimal.
func (s ValueSet) ParseDecimal(val uint64) string {
if v, ok := s[val]; ok {
return v
}
return fmt.Sprintf("%d", val)
}
// ParseName returns the flag value associated with 'name'. Returns false
// if no value is found.
func (s ValueSet) ParseName(name string) (uint64, bool) {
for k, v := range s {
if v == name {
return k, true
}
}
return math.MaxUint64, false
}
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