source: code/trunk/vendor/github.com/prometheus/procfs/internal/util/parse.go@ 822

// Copyright 2018 The Prometheus 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 util

import (
        "os"
        "strconv"
        "strings"
)

// ParseUint32s parses a slice of strings into a slice of uint32s.
func ParseUint32s(ss []string) ([]uint32, error) {
        us := make([]uint32, 0, len(ss))
        for _, s := range ss {
                u, err := strconv.ParseUint(s, 10, 32)
                if err != nil {
                        return nil, err
                }

                us = append(us, uint32(u))
        }

        return us, nil
}

// ParseUint64s parses a slice of strings into a slice of uint64s.
func ParseUint64s(ss []string) ([]uint64, error) {
        us := make([]uint64, 0, len(ss))
        for _, s := range ss {
                u, err := strconv.ParseUint(s, 10, 64)
                if err != nil {
                        return nil, err
                }

                us = append(us, u)
        }

        return us, nil
}

// ParsePInt64s parses a slice of strings into a slice of int64 pointers.
func ParsePInt64s(ss []string) ([]*int64, error) {
        us := make([]*int64, 0, len(ss))
        for _, s := range ss {
                u, err := strconv.ParseInt(s, 10, 64)
                if err != nil {
                        return nil, err
                }

                us = append(us, &u)
        }

        return us, nil
}

// ReadUintFromFile reads a file and attempts to parse a uint64 from it.
func ReadUintFromFile(path string) (uint64, error) {
        data, err := os.ReadFile(path)
        if err != nil {
                return 0, err
        }
        return strconv.ParseUint(strings.TrimSpace(string(data)), 10, 64)
}

// ReadIntFromFile reads a file and attempts to parse a int64 from it.
func ReadIntFromFile(path string) (int64, error) {
        data, err := os.ReadFile(path)
        if err != nil {
                return 0, err
        }
        return strconv.ParseInt(strings.TrimSpace(string(data)), 10, 64)
}

// ParseBool parses a string into a boolean pointer.
func ParseBool(b string) *bool {
        var truth bool
        switch b {
        case "enabled":
                truth = true
        case "disabled":
                truth = false
        default:
                return nil
        }
        return &truth
}