1 files changed, 30 insertions, 0 deletions
diff --git a/src/cmd/term/util.c b/src/cmd/term/util.c
new file mode 100644
index 0000000..3e7d81b
--- /dev/null
+++ b/src/cmd/term/util.c
@@ -0,0 +1,30 @@
+#include <u.h>
+
+static const uchar table[] = {
+#include "nonspacing.h"
+};
+
+static const uchar wtable[] = {
+#include "wide.h"
+};
+
+int 
+wcwidth(wchar_t wc)
+{
+	if (wc < 0xffU)
+		return (wc+1 & 0x7f) >= 0x21 ? 1 : wc ? -1 : 0;
+	if ((wc & 0xfffeffffU) < 0xfffe) {
+		if ((table[table[wc>>8]*32+((wc&255)>>3)]>>(wc&7))&1)
+			return 0;
+		if ((wtable[wtable[wc>>8]*32+((wc&255)>>3)]>>(wc&7))&1)
+			return 2;
+		return 1;
+	}
+	if ((wc & 0xfffe) == 0xfffe)
+		return -1;
+	if (wc-0x20000U < 0x20000)
+		return 2;
+	if (wc == 0xe0001 || wc-0xe0020U < 0x5f || wc-0xe0100U < 0xef)
+		return 0;
+	return 1;
+}