ldd: separate Parse from Exec and trim space

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

ldd/error.go

@@ -1,11 +1,27 @@
 package ldd
 
-import "fmt"
+import (
+	"errors"
+	"fmt"
+)
 
-type EntryUnexpectedSegmentsError struct {
-	Entry string
+var (
+	ErrUnexpectedSeparator = errors.New("unexpected separator")
+	ErrPathNotAbsolute     = errors.New("path not absolute")
+	ErrBadLocationFormat   = errors.New("bad location format")
+	ErrUnexpectedNewline   = errors.New("unexpected newline")
+)
+
+type EntryUnexpectedSegmentsError string
+
+func (e EntryUnexpectedSegmentsError) Is(err error) bool {
+	var eq EntryUnexpectedSegmentsError
+	if !errors.As(err, &eq) {
+		return false
+	}
+	return e == eq
 }
 
-func (e *EntryUnexpectedSegmentsError) Error() string {
-	return fmt.Sprintf("unexpected segments in entry %q", e.Entry)
+func (e EntryUnexpectedSegmentsError) Error() string {
+	return fmt.Sprintf("unexpected segments in entry %q", string(e))
 }