From c9c3b2f4357e30dd078075b3259d86adca6958e3 Mon Sep 17 00:00:00 2001
From: _ov4 <ov4@ov4.org>
Date: Tue, 1 Sep 2026 06:21:08 +0000
Subject: 1

---
 src/util/io.cc | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

(limited to 'src/util')

diff --git a/src/util/io.cc b/src/util/io.cc
index 531bd47..1261684 100644
--- a/src/util/io.cc
+++ b/src/util/io.cc
@@ -96,4 +96,34 @@ char *itoa(int num, char* str, int base)
     return str;
 }
 
+/*
+ * usage - print a help message
+ */
+void usage(void) 
+{
+    printf("Usage: shell [-hvp]\n");
+    printf("   -h   print this message\n");
+    printf("   -v   print additional diagnostic information\n");
+    printf("   -p   do not emit a command prompt\n");
+    exit(1);
+}
+
+/*
+ * unix_error - unix-style error routine
+ */
+void unix_error(char *msg)
+{
+    fprintf(stdout, "%s: %s\n", msg, strerror(errno));
+    exit(1);
+}
+
+/*
+ * app_error - application-style error routine
+ */
+void app_error(char *msg)
+{
+    fprintf(stdout, "%s\n", msg);
+    exit(1);
+}
+
 }
-- 
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