Add build system scaffolding and libc headers

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/libc/wchar/wctob.c b/lib/libc/wchar/wctob.c
new file mode 100644
index 00000000..702e3f75
--- /dev/null
+++ b/lib/libc/wchar/wctob.c
@@ -0,0 +1,16 @@
+#include <stdlib.h>
+#include <wchar.h>
+#include <stdio.h>
+
+#define IS_CODEUNIT(c) ((unsigned)(c) - 0xdf80 < 0x80)
+
+int wctob(wint_t c)
+{
+	if (c < 128U)
+		return (int)c;
+
+	if (MB_CUR_MAX == 1 && IS_CODEUNIT(c))
+		return (unsigned char)c;
+
+	return EOF;
+}