Add some more implementation details

1 files changed, 25 insertions, 0 deletions

diff --git a/util.c b/util.c
new file mode 100644
index 0000000..202cd5b
--- /dev/null
+++ b/util.c
@@ -0,0 +1,25 @@
+#include "util.h"
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdlib.h>
+
+void
+die(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	fprintf(stderr, "%s: ", progname);
+	vfprintf(stderr, fmt, ap);
+	if (*fmt && fmt[strlen(fmt)-1] == ':') {
+		fputc(' ', stderr);
+		perror(NULL);
+	} else {
+		fputc('\n', stderr);
+	}
+	va_end(ap);
+
+	exit(1);
+}