1 files changed, 29 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/stdio/setvbuf.c b/libc-top-half/musl/src/stdio/setvbuf.c
new file mode 100644
index 0000000..523dddc
--- /dev/null
+++ b/libc-top-half/musl/src/stdio/setvbuf.c
@@ -0,0 +1,29 @@
+#include "stdio_impl.h"
+
+/* The behavior of this function is undefined except when it is the first
+ * operation on the stream, so the presence or absence of locking is not
+ * observable in a program whose behavior is defined. Thus no locking is
+ * performed here. No allocation of buffers is performed, but a buffer
+ * provided by the caller is used as long as it is suitably sized. */
+
+int setvbuf(FILE *restrict f, char *restrict buf, int type, size_t size)
+{
+	f->lbf = EOF;
+
+	if (type == _IONBF) {
+		f->buf_size = 0;
+	} else if (type == _IOLBF || type == _IOFBF) {
+		if (buf && size >= UNGET) {
+			f->buf = (void *)(buf + UNGET);
+			f->buf_size = size - UNGET;
+		}
+		if (type == _IOLBF && f->buf_size)
+			f->lbf = '\n';
+	} else {
+		return -1;
+	}
+
+	f->flags |= F_SVB;
+
+	return 0;
+}