chirp: remove regex dependency
"bufio"
"fmt"
"net"
- "regexp"
"strings"
)
@@ -89,7 +88,21 @@ func (b *BIRDClient) exec(cmd string, args ...interface{}) (string, error) {
return b.readResponse()
}
-var respCodeRegex = regexp.MustCompile(`^\d{4}[ -]`)
+// hasResponseCode reports whether the provided byte slice is
+// prefixed with a BIRD response code.
+// Equivalent regex: `^\d{4}[ -]`.
+func hasResponseCode(s []byte) bool {
+ if len(s) < 5 {
+ return false
+ }
+ for _, b := range s[:4] {
+ if '0' <= b && b <= '9' {
+ continue
+ }
+ return false
+ }
+ return s[4] == ' ' || s[4] == '-'
+}
func (b *BIRDClient) readResponse() (string, error) {
var resp strings.Builder
@@ -105,7 +118,7 @@ func (b *BIRDClient) readResponse() (string, error) {
if _, err := resp.Write(out); err != nil {
return "", err
}
- if respCodeRegex.Match(out) {
+ if hasResponseCode(out) {
done = out[4] == ' '
}
if !done {
