builtin-cat-file.c: use parse_options()

diff --git a/usage.c b/usage.c
index f5e652cc76d7587fd7b682eb865d3436c99b16fb..a5fc4ec5fae66823266862fa0254474696c220e6 100644 (file)
--- a/usage.c
+++ b/usage.c
@@ -7,9 +7,9 @@
 
 static void report(const char *prefix, const char *err, va_list params)
 {
-       fputs(prefix, stderr);
-       vfprintf(stderr, err, params);
-       fputs("\n", stderr);
+       char msg[256];
+       vsnprintf(msg, sizeof(msg), err, params);
+       fprintf(stderr, "%s%s\n", prefix, msg);
 }
 
 static NORETURN void usage_builtin(const char *err)