1 files changed, 21 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/stdio/__stdout_write.c b/libc-top-half/musl/src/stdio/__stdout_write.c
new file mode 100644
index 0000000..8190ec5
--- /dev/null
+++ b/libc-top-half/musl/src/stdio/__stdout_write.c
@@ -0,0 +1,21 @@
+#include "stdio_impl.h"
+#include <sys/ioctl.h>
+#ifdef __wasilibc_unmodified_upstream // use isatty rather than manual ioctl
+#else
+#include <__function___isatty.h>
+#endif
+
+size_t __stdout_write(FILE *f, const unsigned char *buf, size_t len)
+{
+#ifdef __wasilibc_unmodified_upstream // use isatty rather than manual ioctl
+	struct winsize wsz;
+#endif
+	f->write = __stdio_write;
+#ifdef __wasilibc_unmodified_upstream // use isatty rather than manual ioctl
+	if (!(f->flags & F_SVB) && __syscall(SYS_ioctl, f->fd, TIOCGWINSZ, &wsz))
+#else
+	if (!(f->flags & F_SVB) && !__isatty(f->fd))
+#endif
+		f->lbf = -1;
+	return __stdio_write(f, buf, len);
+}