Add build system scaffolding and libc headers

1 files changed, 34 insertions, 0 deletions

diff --git a/lib/libc/stdio/stdout.c b/lib/libc/stdio/stdout.c
new file mode 100644
index 00000000..7d55c3e7
--- /dev/null
+++ b/lib/libc/stdio/stdout.c
@@ -0,0 +1,34 @@
+#include <io.h>
+#include <libc.h>
+#include <fcntl.h>
+#include <atomic.h>
+#include <unistd.h>
+
+#define BUFSIZ 4096
+
+weak char __stdout_buffer[0];
+static atomic_flag __stdio_lock = ATOMIC_FLAG_INIT;
+struct __FILE __stdout = { .fd = STDOUT_FILENO,
+			   .flags = O_WRONLY,
+			   .type = 1,
+			   .buf = __stdout_buffer,
+			   .buf_len = 0,
+			   .buf_size = BUFSIZ,
+			   .buf_pos = 0,
+			   .eof = 0,
+			   .unget_cnt = 0,
+			   .offset = 0,
+			   .next = NULL,
+			   .lock = ATOMIC_FLAG_INIT };
+
+struct __FILE *const stdout = (struct __FILE *)&__stdout;
+
+void __libc_fadd(struct __FILE *f)
+{
+	LIBC_LOCK(__stdio_lock);
+	struct __FILE *cur = &__stdout;
+	while (cur->next)
+		cur = cur->next;
+	cur->next = f;
+	LIBC_UNLOCK(__stdio_lock);
+}