1 files changed, 27 insertions, 0 deletions
diff --git a/src/errors.c b/src/errors.c
new file mode 100644
index 0000000..49eb11d
--- /dev/null
+++ b/src/errors.c
@@ -0,0 +1,27 @@
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "errors.h"
+
+void
+err(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+
+	int save = errno;
+	flockfile(stderr);
+
+	fputs("oryx: ", stderr);
+	vfprintf(stderr, fmt, ap);
+	if (fmt[strlen(fmt) - 1] == ':')
+		fprintf(stderr, " %s", strerror(save));
+	fputc('\n', stderr);
+	fflush(stderr);
+	funlockfile(stderr);
+	va_end(ap);
+	exit(EXIT_FAILURE);
+}