set_program_name(), error(): New functions

1 files changed, 47 insertions, 0 deletions

diff --git a/src/output.c b/src/output.c
new file mode 100644
index 0000000..0d8341c
--- /dev/null
+++ b/src/output.c
@@ -0,0 +1,47 @@
+/*
+ * Program output functions
+ *
+ * Copyright (C) 2019  Patrick McDermott
+ *
+ * This file is part of fbcon2png.
+ *
+ * fbcon2png is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * fbcon2png is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with fbcon2png.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "output.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+
+#include "i18n.h"
+
+static const char *_program_name;
+
+void
+set_program_name(const char *name)
+{
+	_program_name = name;
+}
+
+void
+error(const char *format, ...)
+{
+	va_list ap;
+
+	fprintf(stderr, _("%s: Error: "), _program_name);
+	va_start(ap, format);
+	vfprintf(stderr, format, ap);
+	va_end(ap);
+	fputs("\n", stderr);
+}