From 41643a16681c7214e336d6ad09167ec83aa72ab6 Mon Sep 17 00:00:00 2001
From: Jeff Epler <jepler@unpythonic.net>
Date: Sat, 30 Nov 2013 10:19:32 -0600
Subject: [PATCH] A fatal-family function that can format its argument

---
 ungeli.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/ungeli.c b/ungeli.c
index 64b7d63..a5a51d6 100644
--- a/ungeli.c
+++ b/ungeli.c
@@ -101,6 +101,18 @@ fatal(const char *s) {
     fprintf(stderr, "%s\n", s); abort();
 }
 
+static void
+fatalf(const char *fmt, ...) __attribute__((noreturn));
+static void
+fatalf(const char *fmt, ...) {
+    va_list ap;
+    va_start(ap, fmt);
+    vfprintf(stderr, fmt, ap);
+    va_end(ap);
+    fputc('\n', stderr);
+    abort();
+}
+
 static void
 putle64(unsigned char *buf, uint64_t arg)
 {