3 Free Software Foundation, Inc.
4 Written by Werner Lemberg <wl@gnu.org>
6 This file is part of groff.
8 groff is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 groff is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License along
19 with groff; see the file COPYING. If not, write to the Free Software
20 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
24 #include "stringclass.h"
28 const char *check_unicode_name(const char *u
)
35 const char *start
= p
;
37 // only uppercase hex digits allowed
41 val
= val
*0x10 + (*p
-'0');
43 val
= val
*0x10 + (*p
-'A'+10);
46 // biggest Unicode value is U+10FFFF
50 if (*p
== '\0' || *p
== '_')
53 // surrogates not allowed
54 if ((val
>= 0xD800 && val
<= 0xDBFF) || (val
>= 0xDC00 && val
<= 0xDFFF))
57 if (*start
== '0') // no leading zeros allowed if > 0xFFFF
60 else if (p
- start
!= 4) // otherwise, check for exactly 4 hex digits