Add build system scaffolding and libc headers

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/libc/unistd/swab.c b/lib/libc/unistd/swab.c
new file mode 100644
index 00000000..5e4e7e3b
--- /dev/null
+++ b/lib/libc/unistd/swab.c
@@ -0,0 +1,17 @@
+#include <unistd.h>
+
+void swab(const void *restrict src, void *restrict dest, ssize_t nbytes)
+{
+	const char *s = src;
+	char *d = dest;
+
+	if (nbytes <= 0)
+		return;
+
+	ssize_t n = nbytes & ~1;
+
+	for (ssize_t i = 0; i < n; i += 2) {
+		d[i] = s[i + 1];
+		d[i + 1] = s[i];
+	}
+}