Integrate KodoTerm for SSH terminal sessions

third_party/libvterm/src/utf8.h

@@ -0,0 +1,39 @@
+/* The following functions copied and adapted from libtermkey
+ *
+ * http://www.leonerd.org.uk/code/libtermkey/
+ */
+static inline unsigned int utf8_seqlen(long codepoint)
+{
+  if(codepoint < 0x0000080) return 1;
+  if(codepoint < 0x0000800) return 2;
+  if(codepoint < 0x0010000) return 3;
+  if(codepoint < 0x0200000) return 4;
+  if(codepoint < 0x4000000) return 5;
+  return 6;
+}
+
+/* Does NOT NUL-terminate the buffer */
+static int fill_utf8(long codepoint, char *str)
+{
+  int nbytes = utf8_seqlen(codepoint);
+
+  // This is easier done backwards
+  int b = nbytes;
+  while(b > 1) {
+    b--;
+    str[b] = 0x80 | (codepoint & 0x3f);
+    codepoint >>= 6;
+  }
+
+  switch(nbytes) {
+    case 1: str[0] =        (codepoint & 0x7f); break;
+    case 2: str[0] = 0xc0 | (codepoint & 0x1f); break;
+    case 3: str[0] = 0xe0 | (codepoint & 0x0f); break;
+    case 4: str[0] = 0xf0 | (codepoint & 0x07); break;
+    case 5: str[0] = 0xf8 | (codepoint & 0x03); break;
+    case 6: str[0] = 0xfc | (codepoint & 0x01); break;
+  }
+
+  return nbytes;
+}
+/* end copy */