Add stream I/O abstraction library

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 30 insertions, 0 deletions

diff --git a/lib/fstream/printf.c b/lib/fstream/printf.c
new file mode 100644
index 0000000..3850487
--- /dev/null
+++ b/lib/fstream/printf.c
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * printf.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "internal.h"
+
+int ostream_printf(ostream_t *strm, const char *fmt, ...)
+{
+	char *temp = NULL;
+	va_list ap;
+	int ret;
+
+	va_start(ap, fmt);
+
+	ret = vasprintf(&temp, fmt, ap);
+	if (ret < 0)
+		perror(strm->get_filename(strm));
+	va_end(ap);
+
+	if (ret < 0)
+		return -1;
+
+	if (strm->append(strm, temp, ret))
+		ret = -1;
+
+	free(temp);
+	return ret;
+}