updates

1 files changed, 25 insertions, 0 deletions

diff --git a/lib/util.c b/lib/util.c
new file mode 100644
index 0000000..1fe30da
--- /dev/null
+++ b/lib/util.c
@@ -0,0 +1,25 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "util.h"
+
+void
+die(const char *fmt, ...)
+{
+  va_list ap;
+
+  va_start(ap, fmt);
+  vfprintf(stderr, fmt, ap);
+  va_end(ap);
+
+  if (fmt[0] && fmt[strlen(fmt)-1] == ':') {
+    fputc(' ', stderr);
+    perror(NULL);
+  } else {
+    fputc('\n', stderr);
+  }
+
+  exit(1);
+}