Factor out usage_exit into into tools/common.h

1 files changed, 13 insertions, 1 deletions

diff --git a/tools/common.h b/tools/common.h
index 2010e9e9d..506b483b9 100644
--- a/tools/common.h
+++ b/tools/common.h
@@ -11,7 +11,19 @@
 #include <unistd.h>
 #include <getopt.h>
 
-#define error_exit(...) exit((fprintf(stderr, __VA_ARGS__), 1))
+#ifndef PROGRAM_NAME
+#error Define PROGRAM_NAME before including common.h!
+#endif
+#ifndef USAGE_OPTS
+#error Define USAGE_OPTS before including common.h!
+#endif
+
+#define error_exit(...) exit((fprintf(stderr, PROGRAM_NAME ": " __VA_ARGS__), 1))
+
+void usage_exit(int status) {
+	fprintf(stderr, "Usage: " PROGRAM_NAME " " USAGE_OPTS "\n");
+	exit(status);
+}
 
 int getopt_long_index;
 #define getopt_long(argc, argv, optstring, longopts) getopt_long(argc, argv, optstring, longopts, &getopt_long_index)