fix: harden scan edge cases

core/host_excludes.go

@@ -0,0 +1,28 @@
+package core
+
+import (
+	"strings"
+
+	"github.com/shadow1ng/fscan/common"
+	"github.com/shadow1ng/fscan/common/parsers"
+)
+
+func loadHostExcludes(params *common.FlagVars) ([]string, error) {
+	if params == nil {
+		return nil, nil
+	}
+
+	excludes := make([]string, 0, 1)
+	if strings.TrimSpace(params.ExcludeHosts) != "" {
+		excludes = append(excludes, params.ExcludeHosts)
+	}
+	if strings.TrimSpace(params.ExcludeHostsFile) == "" {
+		return excludes, nil
+	}
+
+	lines, err := parsers.ReadLinesFromFile(params.ExcludeHostsFile)
+	if err != nil {
+		return nil, err
+	}
+	return append(excludes, lines...), nil
+}