syscons util remove use kbdcontrol & vidcontrol instead

[unix-history] / lib / libc / locale / utf2.c

/*-
* Copyright (c) 1993
*      The Regents of the University of California.  All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Paul Borman at Krystal Technologies.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)utf2.c      8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */

#include <errno.h>
#include <rune.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>

rune_t  _UTF2_sgetrune __P((const char *, size_t, char const **));
int     _UTF2_sputrune __P((rune_t, char *, size_t, char **));

static _utf_count[16] = {
       1, 1, 1, 1, 1, 1, 1, 1,
       0, 0, 0, 0, 2, 2, 3, 0,
};

int
_UTF2_init(rl)
       _RuneLocale *rl;
{
       rl->sgetrune = _UTF2_sgetrune;
       rl->sputrune = _UTF2_sputrune;
       _CurrentRuneLocale = rl;
       __mb_cur_max = 3;
       return (0);
}

rune_t
_UTF2_sgetrune(string, n, result)
       const char *string;
       size_t n;
       char const **result;
{
       int c;

       if (n < 1 || (c = _utf_count[(*string >> 4) & 0xf]) > n) {
               if (result)
                       *result = string;
               return (_INVALID_RUNE);
       }
       switch (c) {
       case 1:
               if (result)
                       *result = string + 1;
               return (*string & 0xff);
       case 2:
               if ((string[1] & 0xC0) != 0x80)
                       goto encoding_error;
               if (result)
                       *result = string + 2;
               return (((string[0] & 0x1F) << 6) | (string[1] & 0x3F));
       case 3:
               if ((string[1] & 0xC0) != 0x80 || (string[2] & 0xC0) != 0x80)
                       goto encoding_error;
               if (result)
                       *result = string + 3;
               return (((string[0] & 0x1F) << 12) | ((string[1] & 0x3F) << 6)
                   | (string[2] & 0x3F));
       default:
encoding_error: if (result)
                       *result = string + 1;
               return (_INVALID_RUNE);
       }
}

int
_UTF2_sputrune(c, string, n, result)
       rune_t c;
       char *string, **result;
       size_t n;
{
       if (c & 0xF800) {
               if (n >= 3) {
                       if (string) {
                               string[0] = 0xE0 | ((c >> 12) & 0x0F);
                               string[1] = 0x80 | ((c >> 6) & 0x3F);
                               string[2] = 0x80 | ((c) & 0x3F);
                       }
                       if (result)
                               *result = string + 3;
               } else
                       if (result)
                               *result = NULL;

               return (3);
       } else
               if (c & 0x0780) {
                       if (n >= 2) {
                               if (string) {
                                       string[0] = 0xC0 | ((c >> 6) & 0x1F);
                                       string[1] = 0x80 | ((c) & 0x3F);
                               }
                               if (result)
                                       *result = string + 2;
                       } else
                               if (result)
                                       *result = NULL;
                       return (2);
               } else {
                       if (n >= 1) {
                               if (string)
                                       string[0] = c;
                               if (result)
                                       *result = string + 1;
                       } else
                               if (result)
                                       *result = NULL;
                       return (1);
               }
}