Add build system scaffolding and libc headers

1 files changed, 28 insertions, 0 deletions

diff --git a/lib/libc/stdio/fseek.c b/lib/libc/stdio/fseek.c
new file mode 100644
index 00000000..af12cd2c
--- /dev/null
+++ b/lib/libc/stdio/fseek.c
@@ -0,0 +1,28 @@
+#include <unistd.h>
+#include <io.h>
+#include <stdio.h>
+#include <atomic.h>
+
+int fseek(FILE *stream, long offset, int whence)
+{
+	if (stream == NULL || stream->fd < 0)
+		return -1;
+
+	LIBC_LOCK(stream->lock);
+
+	stream->buf_pos = 0;
+	stream->buf_len = 0;
+	stream->flags &= ~_IO_EOF;
+
+	off_t result = lseek(stream->fd, offset, whence);
+
+	LIBC_UNLOCK(stream->lock);
+
+	if (result == (off_t)-1) {
+		stream->flags |= _IO_ERR;
+		return -1;
+	}
+
+	stream->offset = result;
+	return 0;
+}