2 files changed, 60 insertions, 0 deletions
diff --git a/internal/fmsg/fmsg.go b/internal/fmsg/fmsg.go
index 40d34108..c72913f8 100644
--- a/internal/fmsg/fmsg.go
+++ b/internal/fmsg/fmsg.go
@@ -1,2 +1,41 @@
 // Package fmsg provides various functions for output messages.
 package fmsg
+
+import (
+	"log"
+	"os"
+	"sync/atomic"
+)
+
+var (
+	std  = log.New(os.Stdout, "fortify: ", 0)
+	warn = log.New(os.Stderr, "fortify: ", 0)
+
+	verbose = new(atomic.Bool)
+)
+
+func SetPrefix(prefix string) {
+	prefix += ": "
+	std.SetPrefix(prefix)
+	warn.SetPrefix(prefix)
+}
+
+func Print(v ...any) {
+	warn.Print(v...)
+}
+
+func Printf(format string, v ...any) {
+	warn.Printf(format, v...)
+}
+
+func Println(v ...any) {
+	warn.Println(v...)
+}
+
+func Fatal(v ...any) {
+	warn.Fatal(v...)
+}
+
+func Fatalf(format string, v ...any) {
+	warn.Fatalf(format, v...)
+}
diff --git a/internal/fmsg/verbose.go b/internal/fmsg/verbose.go
new file mode 100644
index 00000000..36faadeb
--- /dev/null
+++ b/internal/fmsg/verbose.go
@@ -0,0 +1,21 @@
+package fmsg
+
+func Verbose() bool {
+	return verbose.Load()
+}
+
+func SetVerbose(v bool) {
+	verbose.Store(v)
+}
+
+func VPrintf(format string, v ...any) {
+	if verbose.Load() {
+		std.Printf(format, v...)
+	}
+}
+
+func VPrintln(v ...any) {
+	if verbose.Load() {
+		std.Println(v...)
+	}
+}