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/*
* $Id$
*
* Copyright (C) 2003 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Original Author: Adrian Havill <havill@redhat.com>
*
* Contributors:
*/
#include <errno.h> // errno, EILSEQ, ERANGE
#include "wlite_config.h" // wchar_t, NULL, size_t
#include "wlite_wchar.h" // prototypes
#include "wlite_wctype.h"
#include "wlite_stdlib.h"
static const long wlite_invalid = -1;
static const long wlite_incomplete = -2;
#if WLITE_READ_6_BYTE_UTF8_SURROGATE && WLITE_XBMP_CHAR
static int
is_surrogate_hi(wchar_t u) { return u >= 0xD800 && u <= 0xDBFF; }
static int
is_surrogate_lo(wchar_t u) { return u >= 0xDC00 && u <= 0xDFFF; }
static wchar_t
make_utc_from_surrogates(wchar_t hi, wchar_t lo) {
wchar_t u = 0;
u += (hi - 0xD800) * 0x400;
u += lo - 0xDC00 + 0x10000;
return u;
}
#endif
static int
is_plane_0(wchar_t u) { return (u + 1) > 0x0000 && (u - 1) < 0xFFFF; }
static void
make_surrogates(unsigned long u, wchar_t *hi, wchar_t *lo) {
if (hi != NULL)
*hi = (u - 0x10000) / 0x400 + 0xD800;
if (lo != NULL)
*lo = (u - 0x10000) % 0x400 + 0xDC00;
}
static int
is_tail(uint8_t c) { return (c & 0xC0) == 0x80; }
static long
get_utc(const unsigned char **utf8, size_t *length) {
long u = 0;
const uint8_t *s = NULL;
if (*length == 0) return wlite_incomplete;
s = *utf8;
if (s[0] < 128) {
/* HEAD/TAIL pattern: 0zzzzzzz
* ... ASCII is just ASCII. Ain't UTF-8 wonderful?
*/
u |= (*s++ & 0x7F) << 0;
*length -= 1;
}
else if ((s[0] & 0xE0) == 0xC0) {
/* HEAD/TAIL pattern: 110yyyyy 10zzzzzz
* ... most probably a European character or fancy dingbat/sym if we're
* here
*/
if (*length < 2) return wlite_incomplete;
if (!is_tail(s[1])) return wlite_invalid;
u |= (*s++ & 0x1F) << 6;
u |= *s++ & 0x3F << 0;
*length -= 2;
if (u < 0x0080) u = wlite_invalid;
}
else if ((s[0] & 0xF0) == 0xE0) {
/* HEAD/TAIL/TAIL pattern: 1110xxxx 10yyyyyy 10zzzzzz
* ... most probably a CJK character, but sometimes Euro/Asian/African.
*/
if (*length < 3) return wlite_incomplete;
if (!is_tail(s[1]) || !is_tail(s[2])) return wlite_invalid;
u |= (*s++ & 0x0F) << 12;
u |= (*s++ & 0x3F) << 6;
u |= (*s++ & 0x3F) << 0;
*length -= 3;
if (u < 0x0800) u = wlite_invalid;
# if WLITE_READ_6_BYTE_UTF8_SURROGATE && WLITE_XBMP_CHAR
if (is_surrogate_hi(u)) {
/* XXX: see the note below regarding four byte patterns
*
* if you're here with the debugger then you should probably check
* your favorite character encoding converter for brain-damage.
*/
size_t length_copy = *length; /* save from recursion */
const unsigned char *s_copy = s;
long u1 = u;
long u2 = get_utc(&s_copy, &length_copy);
if (u2 == wlite_incomplete) return u2;
else if (is_surrogate_lo(u2)) {
u = make_utc_from_surrogates(u1, u2);
*length -= 3;
s += 3;
}
}
# endif
}
else if ((s[0] & 0xF8) == 0xF0) {
/* HEAD/TAIL/TAIL/TAIL bit pattern: 11110www 10xxxxxx 10yyyyyy 10zzzzzz
* ... most probably a freak CJK character and the string is testing
* ... Unicode conformance. Either that or you're attempting to process
* ... Klingon.
*
* XXX: if you're here with the debugger and you're working with
* real-world text, it's probably suspect (I doubt you have any fonts
* to represent the characters in this range anyway)
*/
if (*length < 4) return wlite_incomplete; // incomplete
if (!is_tail(s[1]) || !is_tail(s[2]) || !is_tail(s[3]))
return wlite_invalid;
u |= (*s++ & 0x07) << 18;
u |= (*s++ & 0x3F) << 12;
u |= (*s++ & 0x3F) << 6;
u |= (*s++ & 0x3F) << 0;
*length -= 4;
if (u <= 0xFFFF) {
u = wlite_invalid;
}
}
else {
/* we either got a five or six byte UTF-8 sequence, a "decapitated"
* (all tail with no head byte-- sometimes raw Latin-1 slipped in a
* UTF-8 string) UTF-8 sequence, or we got 0xFE or 0xFF in the byte
* stream (always illegal in UTF-8-- which means these two can be used
* as private non-exported sentinals in applications. Did I mention
* that UTF-8 is wonderful?)
*/
u = wlite_invalid;
while (*length != 0 && (is_tail(*s) || *s >= 0xF8)) {
--*length;
++s;
}
}
*utf8 = s;
return u;
}
size_t
wlite_mbrtowc(wchar_t *c, const char *s, size_t n, wlite_mbstate_t *ps) {
static wlite_mbstate_t internal = { 0 };
size_t consumed = 0, remaining = n;
const unsigned char *utf8 = (const unsigned char *) s;
long u = 0;
if (ps == NULL)
ps = &internal;
if (s != NULL) {
u = get_utc(&utf8, &remaining);
if (u == wlite_incomplete) {
ps->flags_ |= WLITE_MBSTATE_INCOMPLETE_;
ps->flags_ &= ~WLITE_MBSTATE_ERROR_;
return (size_t) -2;
}
else if (u == wlite_invalid) {
ps->flags_ &= ~WLITE_MBSTATE_INCOMPLETE_;
ps->flags_ |= WLITE_MBSTATE_ERROR_;
errno = EILSEQ;
return (size_t) -1;
}
else {
ps->wcout_ = 0;
if (c != NULL) {
if ((ps->flags_ & WLITE_MBSTATE_SURROGATE_) && !is_plane_0(u)) {
wchar_t hi, lo;
make_surrogates(u, &hi, &lo);
/* XXX: Std C does not allow writing more than one wide
* character to c; this is a non-standard extension for
* internal API use.
*/
c[0] = (wchar_t) hi;
c[1] = (wchar_t) lo;
ps->wcout_ = 2;
}
else {
*c = (wchar_t) u;
ps->wcout_ = 1;
}
}
if (u == 0) {
wlite_0_mbstate_(ps);
return 0;
}
consumed = n - remaining;
}
}
else if (s == NULL) {
if (ps->flags_ & WLITE_MBSTATE_INCOMPLETE_) {
errno = EILSEQ;
return (size_t) -1;
}
else {
wlite_0_mbstate_(ps);
return WLITE_MBS_SHIFT_STATES_;
}
}
return consumed;
}
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