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package types
import (
"fmt"
"io"
"reflect"
)
// ScanFully uses fmt.Sscanf with verb to fully scan val into ptr.
func ScanFully(ptr interface{}, val string, verb byte) error {
t := reflect.ValueOf(ptr).Elem().Type()
// attempt to read extra bytes to make sure the value is consumed
var b []byte
n, err := fmt.Sscanf(val, "%"+string(verb)+"%s", ptr, &b)
switch {
case n < 1 || n == 1 && err != io.EOF:
return fmt.Errorf("failed to parse %q as %v: %v", val, t, err)
case n > 1:
return fmt.Errorf("failed to parse %q as %v: extra characters %q", val, t, string(b))
}
// n == 1 && err == io.EOF
return nil
}
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