freebsd-dev/lib/libc/locale/big5.c
1998-08-15 20:53:34 +00:00

121 lines
3.3 KiB
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.
*/
#ifdef XPG4
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)big5.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>
#include <sys/types.h>
rune_t _BIG5_sgetrune __P((const char *, size_t, char const **));
int _BIG5_sputrune __P((rune_t, char *, size_t, char **));
int
_BIG5_init(rl)
_RuneLocale *rl;
{
rl->sgetrune = _BIG5_sgetrune;
rl->sputrune = _BIG5_sputrune;
_CurrentRuneLocale = rl;
__mb_cur_max = 2;
return (0);
}
static inline int
_big5_check(c)
u_int c;
{
c &= 0xff;
return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1);
}
rune_t
_BIG5_sgetrune(string, n, result)
const char *string;
size_t n;
char const **result;
{
rune_t rune = 0;
int len;
if (n < 1 || (len = _big5_check(*string)) > n) {
if (result)
*result = string;
return (_INVALID_RUNE);
}
while (len-- >= 0)
rune = (rune << 8) | ((u_int)(*string++) & 0xff);
if (result)
*result = string + len;
return rune;
}
int
_BIG5_sputrune(c, string, n, result)
rune_t c;
char *string, **result;
size_t n;
{
if (c & 0x8000) {
if (n >= 2) {
string[0] = (c >> 8) & 0xff;
string[1] = c & 0xff;
if (result)
*result = string + 2;
return (2);
}
}
else {
if (n >= 1) {
*string = c & 0xff;
if (result)
*result = string + 1;
return (1);
}
}
if (result)
*result = string;
return (0);
}
#endif /* XPG4 */