Add build system scaffolding and libc headers

1 files changed, 22 insertions, 0 deletions

diff --git a/lib/libc/wctype/iswalpha.c b/lib/libc/wctype/iswalpha.c
new file mode 100644
index 00000000..17c8508c
--- /dev/null
+++ b/lib/libc/wctype/iswalpha.c
@@ -0,0 +1,22 @@
+#include <libc.h>
+#include <wctype.h>
+
+int iswalpha(wint_t wc)
+{
+	const unsigned char t[] = {
+#include <__alpha.h>
+	};
+
+	if (wc < 0x20000U)
+		return (t[t[wc >> 8] * 32 + ((wc & 255) >> 3)] >> (wc & 7)) & 1;
+
+	if (wc < 0x2fffeU)
+		return 1;
+
+	return 0;
+}
+
+weak int iswalpha_l(wint_t wc, locale_t unused locale)
+{
+	return iswalpha(wc);
+}