/* $NetBSD: big5.c,v 1.5 2001/01/03 15:23:26 lukem 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 #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char sccsid[] = "@(#)big5.c 8.1 (Berkeley) 6/4/93"; #else __RCSID("$NetBSD: big5.c,v 1.5 2001/01/03 15:23:26 lukem Exp $"); #endif #endif /* LIBC_SCCS and not lint */ #include #include #include "rune.h" #include #include #include #include #include "rune_local.h" #ifdef lint #define inline #endif int _BIG5_init __P((_RuneLocale *)); static inline int _big5_check __P((u_int)); static inline int _big5_check2 __P((u_int)); size_t _BIG5_mbrtowc __P((struct _RuneLocale *, rune_t *, const char *, size_t, void *)); size_t _BIG5_wcrtomb __P((struct _RuneLocale *, char *, size_t, const rune_t, void *)); void _BIG5_initstate __P((_RuneLocale *, void *)); void _BIG5_packstate __P((_RuneLocale *, mbstate_t *, void *)); void _BIG5_unpackstate __P((_RuneLocale *, void *, const mbstate_t *)); typedef struct { void *runelocale; /* reserved for future thread-safeness */ char ch[2]; int chlen; } _BIG5State; static _RuneState _BIG5_RuneState = { sizeof(_BIG5State), /* sizestate */ _BIG5_initstate, /* initstate */ _BIG5_packstate, /* packstate */ _BIG5_unpackstate /* unpackstate */ }; int _BIG5_init(rl) _RuneLocale *rl; { _DIAGASSERT(rl != NULL); /* sanity check to avoid overruns */ if (sizeof(_BIG5State) > sizeof(mbstate_t)) return (EINVAL); rl->__rune_mbrtowc = _BIG5_mbrtowc; rl->__rune_wcrtomb = _BIG5_wcrtomb; rl->__rune_RuneState = &_BIG5_RuneState; rl->__rune_mb_cur_max = 2; return (0); } static inline int _big5_check(c) u_int c; { c &= 0xff; return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); } static inline int _big5_check2(c) u_int c; { c &= 0xff; if ((c >= 0x40 && c <= 0x7f) || (c >= 0xa1 && c <= 0xfe)) return 1; else return 0; } /* s is non-null */ size_t _BIG5_mbrtowc(rl, pwcs, s, n, state) _RuneLocale *rl; rune_t *pwcs; const char *s; size_t n; void *state; { _BIG5State *ps; rune_t rune; int c; /* rl appears to be unused */ /* pwcs may be NULL */ _DIAGASSERT(s != NULL); _DIAGASSERT(state != NULL); 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: break; default: /* illegal state */ goto encoding_error; } c = _big5_check(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 (c) { case 1: rune = ps->ch[0] & 0xff; break; case 2: if (!_big5_check2(ps->ch[1] & 0xff)) goto encoding_error; rune = ((ps->ch[0] & 0xff) << 8) | (ps->ch[1] & 0xff); break; default: /* illegal state */ goto encoding_error; } 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 _BIG5_wcrtomb(rl, s, n, wc, state) _RuneLocale *rl; char *s; size_t n; const rune_t wc; void *state; { int l; /* rl appears to be unused */ _DIAGASSERT(s != NULL); /* state appears to be unused */ /* check invalid sequence */ if (wc & ~0xffff) { errno = EILSEQ; return (size_t)-1; } if (wc & 0x8000) { if (_big5_check((wc >> 8) & 0xff) != 2 || !_big5_check2(wc & 0xff)) { errno = EILSEQ; return (size_t)-1; } l = 2; } else { if (wc & ~0xff || !_big5_check(wc & 0xff)) { errno = EILSEQ; return (size_t)-1; } l = 1; } if (n < l) { /* bound check failure */ errno = EILSEQ; /*XXX*/ return (size_t)-1; } if (l == 2) { s[0] = (wc >> 8) & 0xff; s[1] = wc & 0xff; } else s[0] = wc & 0xff; return (l); } void _BIG5_initstate(rl, s) _RuneLocale *rl; void *s; { _BIG5State *state; /* rl appears to be unused */ if (!s) return; state = s; memset(state, 0, sizeof(_BIG5State)); } void _BIG5_packstate(rl, dst, src) _RuneLocale *rl; mbstate_t *dst; void* src; { /* rl appears to be unused */ _DIAGASSERT(dst != NULL); _DIAGASSERT(src != NULL); memcpy((caddr_t)dst, (caddr_t)src, sizeof(_BIG5State)); return; } void _BIG5_unpackstate(rl, dst, src) _RuneLocale *rl; void* dst; const mbstate_t *src; { /* rl appears to be unused */ _DIAGASSERT(dst != NULL); _DIAGASSERT(src != NULL); memcpy((caddr_t)dst, (caddr_t)src, sizeof(_BIG5State)); return; }