1 files changed, 19 insertions, 0 deletions
diff --git a/lib/lib.c b/lib/lib.c
index 752fd0a1..c4e70dfe 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -346,6 +346,25 @@ int stridx(char *haystack, char needle)
   return off-haystack;
 }
 
+// Convert wc to utf8, returning bytes written. Does not null terminate.
+int wctoutf8(char *s, unsigned wc)
+{
+  int len = (wc>0x7ff)+(wc>0xffff), mask = 12+len+!!len;
+
+  if (wc<128) {
+    *s = wc;
+    return 1;
+  } else {
+    do {
+      s[1+len] = 0x80+(wc&0x3f);
+      wc >>= 7;
+    } while (len--);
+    *s = wc|mask;
+  }
+
+  return 2+len;
+}
+
 // Convert utf8 sequence to a unicode wide character
 // returns bytes consumed, or -1 if err, or -2 if need more data.
 int utf8towc(wchar_t *wc, char *str, unsigned len)