+ if (e - s < 2)
+ return 0;
+
+ /* Disallow overlong 3-byte sequence. */
+ if (c == 0xE0 && (unsigned char)*s < 0xA0)
+ return 0;
+
+ /* Disallow U+D800..U+DFFF. */
+ if (c == 0xED && (unsigned char)*s > 0x9F)
+ return 0;
+
+ /* Make sure subsequent bytes are in the range 0x80..0xBF. */
+ if (((unsigned char)*s++ & 0xC0) != 0x80)
+ return 0;
+ if (((unsigned char)*s++ & 0xC0) != 0x80)
+ return 0;