NetBSD/lib/libc/locale/euc.c

322 lines
6.8 KiB
C

/* $NetBSD: euc.c,v 1.5 2000/12/30 05:05:57 itojun Exp $ */
/*-
* 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.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)euc.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: euc.c,v 1.5 2000/12/30 05:05:57 itojun Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <errno.h>
#include "rune.h"
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef lint
#define inline
#endif
int _EUC_init __P((_RuneLocale *));
static inline int _euc_set __P((u_int));
size_t _EUC_mbrtowc __P((struct _RuneLocale *, rune_t *, const char *, size_t,
void *));
size_t _EUC_wcrtomb __P((struct _RuneLocale *, char *, size_t, const rune_t,
void *));
void _EUC_initstate __P((_RuneLocale *, void *));
void _EUC_packstate __P((_RuneLocale *, mbstate_t *, void *));
void _EUC_unpackstate __P((_RuneLocale *, void *, const mbstate_t *));
typedef struct {
void *runelocale; /* reserved for future thread-safeness */
char ch[3];
int chlen;
} _EUCState;
static _RuneState _EUC_RuneState = {
sizeof(_EUCState), /* sizestate */
_EUC_initstate, /* initstate */
_EUC_packstate, /* packstate */
_EUC_unpackstate /* unpackstate */
};
typedef struct {
int count[4];
rune_t bits[4];
rune_t mask;
} _EucInfo;
int
_EUC_init(rl)
_RuneLocale *rl;
{
_EucInfo *ei;
int x;
char *v, *e;
/* sanity check to avoid overruns */
if (sizeof(_EUCState) > sizeof(mbstate_t))
return (EINVAL);
rl->__rune_mbrtowc = _EUC_mbrtowc;
rl->__rune_wcrtomb = _EUC_wcrtomb;
if (!rl->__rune_variable)
return (EFTYPE);
v = (char *) rl->__rune_variable;
while (*v == ' ' || *v == '\t')
++v;
if ((ei = malloc(sizeof(_EucInfo))) == NULL)
return (ENOMEM);
for (x = 0; x < 4; ++x) {
ei->count[x] = (int) strtol(v, &e, 0);
if (v == e || !(v = e)) {
free(ei);
return (EFTYPE);
}
while (*v == ' ' || *v == '\t')
++v;
ei->bits[x] = (int) strtol(v, &e, 0);
if (v == e || !(v = e)) {
free(ei);
return (EFTYPE);
}
while (*v == ' ' || *v == '\t')
++v;
}
ei->mask = (int)strtol(v, &e, 0);
if (v == e || !(v = e)) {
free(ei);
return (EFTYPE);
}
if (sizeof(_EucInfo) <= rl->__variable_len) {
memcpy(rl->__rune_variable, ei, sizeof(_EucInfo));
free(ei);
} else {
rl->__rune_variable = &ei;
}
rl->__variable_len = sizeof(_EucInfo);
rl->__rune_RuneState = &_EUC_RuneState;
rl->__rune_mb_cur_max = 3;
return (0);
}
#define CEI(rl) ((_EucInfo *)(rl->__rune_variable))
#define _SS2 0x008e
#define _SS3 0x008f
static inline int
_euc_set(c)
u_int c;
{
c &= 0xff;
return ((c & 0x80) ? c == _SS3 ? 3 : c == _SS2 ? 2 : 1 : 0);
}
/* s is non-null */
size_t
_EUC_mbrtowc(rl, pwcs, s, n, state)
_RuneLocale *rl;
rune_t *pwcs;
const char *s;
size_t n;
void *state;
{
_EUCState *ps;
rune_t rune;
int c, set, len;
ps = state;
/* make sure we have the first byte in the buffer */
switch (ps->chlen) {
case 0:
if (n < 1)
return (size_t)-2;
ps->ch[0] = *s++;
ps->chlen = 1;
n--;
break;
case 1:
case 2:
break;
default:
/* illgeal state */
goto encoding_error;
}
c = CEI(rl)->count[set = _euc_set(ps->ch[0] & 0xff)];
if (c == 0)
goto encoding_error;
while (ps->chlen < c) {
if (n < 1)
return (size_t)-2;
ps->ch[ps->chlen] = *s++;
ps->chlen++;
n--;
}
switch (set) {
case 3:
case 2:
/* skip SS2/SS3 */
len = c - 1;
s = &ps->ch[1];
break;
case 1:
case 0:
len = c;
s = &ps->ch[0];
break;
}
rune = 0;
while (len-- > 0)
rune = (rune << 8) | ((u_int)(*s++) & 0xff);
rune = (rune & ~CEI(rl)->mask) | CEI(rl)->bits[set];
ps->chlen = 0;
if (pwcs)
*pwcs = rune;
if (!rune)
return 0;
else
return c;
encoding_error:
ps->chlen = 0;
return (size_t)-1;
}
/* s is non-null */
size_t
_EUC_wcrtomb(rl, s, n, wc, state)
_RuneLocale *rl;
char *s;
size_t n;
const rune_t wc;
void *state;
{
rune_t m = wc & CEI(rl)->mask;
rune_t nm = wc & ~m;
int set, i, len;
for (set = 0;
set < sizeof(CEI(rl)->count)/sizeof(CEI(rl)->count[0]);
set++) {
if (m == CEI(rl)->bits[set])
break;
}
/* fallback case - not sure if it is necessary */
if (set == sizeof(CEI(rl)->count)/sizeof(CEI(rl)->count[0]))
set = 1;
i = CEI(rl)->count[set];
if (n < i)
goto notenough;
m = (set % 2) ? 0x80 : 0x00;
switch (set) {
case 2:
*s++ = _SS2;
i--;
break;
case 3:
*s++ = _SS3;
i--;
break;
}
while (i-- > 0)
*s++ = ((nm >> (i << 3)) & 0xff) | m;
return CEI(rl)->count[set];
return len;
notenough:
/* bound check failure */
errno = EILSEQ; /*XXX*/
return (size_t)-1;
}
void
_EUC_initstate(rl, s)
_RuneLocale *rl;
void *s;
{
_EUCState *state;
if (!s)
return;
state = s;
memset(state, 0, sizeof(_EUCState));
}
void
_EUC_packstate(rl, dst, src)
_RuneLocale *rl;
mbstate_t *dst;
void* src;
{
memcpy((caddr_t)dst, (caddr_t)src, sizeof(_EUCState));
return;
}
void
_EUC_unpackstate(rl, dst, src)
_RuneLocale *rl;
void* dst;
const mbstate_t *src;
{
memcpy((caddr_t)dst, (caddr_t)src, sizeof(_EUCState));
return;
}