field.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import (
"errors"
"fmt"
"strconv"
)
// field helps for field parsing
type field struct{ err error }
// uatoi parses an unsigned integer string and saves the error.
// it assumes that the val is unsigned.
// for ease of usability: it returns an int instead of uint.
func (f *field) uatoi(name, val string) int {
n, err := strconv.Atoi(val)
if err != nil || n < 0 {
f.err = fmt.Errorf("incorrect field -> %q = %q", name, val)
}
return n
}
func atoi(input []byte) (int, error) {
val := 0
for i := 0; i < len(input); i++ {
char := input[i]
if char < '0' || char > '9' {
return 0, errors.New("invalid number")
}
val = val*10 + int(char) - '0'
}
return val, nil
}
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