--- /dev/null
+/*-
+ * Copyright (c) 2002-2004 Tim J. Robbins
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/param.h>
+/* dumb down UTF-8 to do UTF2 */
+__FBSDID("$FreeBSD: src/lib/libc/locale/utf8.c,v 1.11 2004/07/27 06:29:48 tjr Exp $");
+
+#include "xlocale_private.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <runetype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+#include "mblocal.h"
+
+#define UTF2_MB_CUR_MAX 3
+
+static size_t _UTF2_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t,
+ mbstate_t * __restrict, locale_t);
+static int _UTF2_mbsinit(const mbstate_t *, locale_t);
+static size_t _UTF2_mbsnrtowcs(wchar_t * __restrict, const char ** __restrict,
+ size_t, size_t, mbstate_t * __restrict, locale_t);
+static size_t _UTF2_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict, locale_t);
+static size_t _UTF2_wcsnrtombs(char * __restrict, const wchar_t ** __restrict,
+ size_t, size_t, mbstate_t * __restrict, locale_t);
+
+typedef struct {
+ wchar_t ch;
+ int want;
+ wchar_t lbound;
+} _UTF2State;
+
+__private_extern__ int
+_UTF2_init(struct __xlocale_st_runelocale *xrl)
+{
+
+ xrl->__mbrtowc = _UTF2_mbrtowc;
+ xrl->__wcrtomb = _UTF2_wcrtomb;
+ xrl->__mbsinit = _UTF2_mbsinit;
+ xrl->__mbsnrtowcs = _UTF2_mbsnrtowcs;
+ xrl->__wcsnrtombs = _UTF2_wcsnrtombs;
+ xrl->__mb_cur_max = UTF2_MB_CUR_MAX;
+
+ return (0);
+}
+
+static int
+_UTF2_mbsinit(const mbstate_t *ps, locale_t loc)
+{
+
+ return (ps == NULL || ((const _UTF2State *)ps)->want == 0);
+}
+
+static size_t
+_UTF2_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
+ mbstate_t * __restrict ps, locale_t loc)
+{
+ _UTF2State *us;
+ int ch, i, mask, want;
+ wchar_t lbound, wch;
+
+ us = (_UTF2State *)ps;
+
+ if (us->want < 0 || us->want > 3) {
+ errno = EINVAL;
+ return ((size_t)-1);
+ }
+
+ if (s == NULL) {
+ s = "";
+ n = 1;
+ pwc = NULL;
+ }
+
+ if (n == 0)
+ /* Incomplete multibyte sequence */
+ return ((size_t)-2);
+
+ if (us->want == 0 && ((ch = (unsigned char)*s) & ~0x7f) == 0) {
+ /* Fast path for plain ASCII characters. */
+ if (pwc != NULL)
+ *pwc = ch;
+ return (ch != '\0' ? 1 : 0);
+ }
+
+ if (us->want == 0) {
+ /*
+ * Determine the number of octets that make up this character
+ * from the first octet, and a mask that extracts the
+ * interesting bits of the first octet. We already know
+ * the character is at least two bytes long.
+ *
+ * We also specify a lower bound for the character code to
+ * detect redundant, non-"shortest form" encodings. For
+ * example, the sequence C0 80 is _not_ a legal representation
+ * of the null character. This enforces a 1-to-1 mapping
+ * between character codes and their multibyte representations.
+ */
+ ch = (unsigned char)*s;
+ if ((ch & 0x80) == 0) {
+ mask = 0x7f;
+ want = 1;
+ lbound = 0;
+ } else if ((ch & 0xe0) == 0xc0) {
+ mask = 0x1f;
+ want = 2;
+ lbound = 0x80;
+ } else if ((ch & 0xf0) == 0xe0) {
+ mask = 0x0f;
+ want = 3;
+ lbound = 0x800;
+ } else {
+ /*
+ * Malformed input; input is not UTF2.
+ */
+ errno = EILSEQ;
+ return ((size_t)-1);
+ }
+ } else {
+ want = us->want;
+ lbound = us->lbound;
+ }
+
+ /*
+ * Decode the octet sequence representing the character in chunks
+ * of 6 bits, most significant first.
+ */
+ if (us->want == 0)
+ wch = (unsigned char)*s++ & mask;
+ else
+ wch = us->ch;
+ for (i = (us->want == 0) ? 1 : 0; i < MIN(want, n); i++) {
+ if ((*s & 0xc0) != 0x80) {
+ /*
+ * Malformed input; bad characters in the middle
+ * of a character.
+ */
+ errno = EILSEQ;
+ return ((size_t)-1);
+ }
+ wch <<= 6;
+ wch |= *s++ & 0x3f;
+ }
+ if (i < want) {
+ /* Incomplete multibyte sequence. */
+ us->want = want - i;
+ us->lbound = lbound;
+ us->ch = wch;
+ return ((size_t)-2);
+ }
+ if (wch < lbound) {
+ /*
+ * Malformed input; redundant encoding.
+ */
+ errno = EILSEQ;
+ return ((size_t)-1);
+ }
+ if (pwc != NULL)
+ *pwc = wch;
+ us->want = 0;
+ return (wch == L'\0' ? 0 : want);
+}
+
+static size_t
+_UTF2_mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src,
+ size_t nms, size_t len, mbstate_t * __restrict ps, locale_t loc)
+{
+ _UTF2State *us;
+ const char *s;
+ size_t nchr;
+ wchar_t wc;
+ size_t nb;
+
+ us = (_UTF2State *)ps;
+
+ s = *src;
+ nchr = 0;
+
+ if (dst == NULL) {
+ /*
+ * The fast path in the loop below is not safe if an ASCII
+ * character appears as anything but the first byte of a
+ * multibyte sequence. Check now to avoid doing it in the loop.
+ */
+ if (nms > 0 && us->want > 0 && (signed char)*s > 0) {
+ errno = EILSEQ;
+ return ((size_t)-1);
+ }
+ for (;;) {
+ if (nms > 0 && (signed char)*s > 0)
+ /*
+ * Fast path for plain ASCII characters
+ * excluding NUL.
+ */
+ nb = 1;
+ else if ((nb = _UTF2_mbrtowc(&wc, s, nms, ps, loc)) ==
+ (size_t)-1)
+ /* Invalid sequence - mbrtowc() sets errno. */
+ return ((size_t)-1);
+ else if (nb == 0 || nb == (size_t)-2)
+ return (nchr);
+ s += nb;
+ nms -= nb;
+ nchr++;
+ }
+ /*NOTREACHED*/
+ }
+
+ /*
+ * The fast path in the loop below is not safe if an ASCII
+ * character appears as anything but the first byte of a
+ * multibyte sequence. Check now to avoid doing it in the loop.
+ */
+ if (nms > 0 && len > 0 && us->want > 0 && (signed char)*s > 0) {
+ errno = EILSEQ;
+ return ((size_t)-1);
+ }
+ while (len-- > 0) {
+ if (nms > 0 && (signed char)*s > 0) {
+ /*
+ * Fast path for plain ASCII characters
+ * excluding NUL.
+ */
+ *dst = (wchar_t)*s;
+ nb = 1;
+ } else if ((nb = _UTF2_mbrtowc(dst, s, nms, ps, loc)) ==
+ (size_t)-1) {
+ *src = s;
+ return ((size_t)-1);
+ } else if (nb == (size_t)-2) {
+ *src = s + nms;
+ return (nchr);
+ } else if (nb == 0) {
+ *src = NULL;
+ return (nchr);
+ }
+ s += nb;
+ nms -= nb;
+ nchr++;
+ dst++;
+ }
+ *src = s;
+ return (nchr);
+}
+
+static size_t
+_UTF2_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc)
+{
+ _UTF2State *us;
+ unsigned char lead;
+ int i, len;
+
+ us = (_UTF2State *)ps;
+
+ if (us->want != 0) {
+ errno = EINVAL;
+ return ((size_t)-1);
+ }
+
+ if (s == NULL)
+ /* Reset to initial shift state (no-op) */
+ return (1);
+
+ if ((wc & ~0x7f) == 0) {
+ /* Fast path for plain ASCII characters. */
+ *s = (char)wc;
+ return (1);
+ }
+
+ /*
+ * Determine the number of octets needed to represent this character.
+ * We always output the shortest sequence possible. Also specify the
+ * first few bits of the first octet, which contains the information
+ * about the sequence length.
+ */
+ if ((wc & ~0x7f) == 0) {
+ lead = 0;
+ len = 1;
+ } else if ((wc & ~0x7ff) == 0) {
+ lead = 0xc0;
+ len = 2;
+ } else if ((wc & ~0xffff) == 0) {
+ lead = 0xe0;
+ len = 3;
+ } else {
+ errno = EILSEQ;
+ return ((size_t)-1);
+ }
+
+ /*
+ * Output the octets representing the character in chunks
+ * of 6 bits, least significant last. The first octet is
+ * a special case because it contains the sequence length
+ * information.
+ */
+ for (i = len - 1; i > 0; i--) {
+ s[i] = (wc & 0x3f) | 0x80;
+ wc >>= 6;
+ }
+ *s = (wc & 0xff) | lead;
+
+ return (len);
+}
+
+static size_t
+_UTF2_wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src,
+ size_t nwc, size_t len, mbstate_t * __restrict ps, locale_t loc)
+{
+ _UTF2State *us;
+ char buf[MB_LEN_MAX];
+ const wchar_t *s;
+ size_t nbytes;
+ size_t nb;
+
+ us = (_UTF2State *)ps;
+
+ if (us->want != 0) {
+ errno = EINVAL;
+ return ((size_t)-1);
+ }
+
+ s = *src;
+ nbytes = 0;
+
+ if (dst == NULL) {
+ while (nwc-- > 0) {
+ if (0 <= *s && *s < 0x80)
+ /* Fast path for plain ASCII characters. */
+ nb = 1;
+ else if ((nb = _UTF2_wcrtomb(buf, *s, ps, loc)) ==
+ (size_t)-1)
+ /* Invalid character - wcrtomb() sets errno. */
+ return ((size_t)-1);
+ if (*s == L'\0')
+ return (nbytes + nb - 1);
+ s++;
+ nbytes += nb;
+ }
+ return (nbytes);
+ }
+
+ while (len > 0 && nwc-- > 0) {
+ if (0 <= *s && *s < 0x80) {
+ /* Fast path for plain ASCII characters. */
+ nb = 1;
+ *dst = *s;
+ } else if (len > (size_t)UTF2_MB_CUR_MAX) {
+ /* Enough space to translate in-place. */
+ if ((nb = (int)_UTF2_wcrtomb(dst, *s, ps, loc)) < 0) {
+ *src = s;
+ return ((size_t)-1);
+ }
+ } else {
+ /*
+ * May not be enough space; use temp. buffer.
+ */
+ if ((nb = (int)_UTF2_wcrtomb(buf, *s, ps, loc)) < 0) {
+ *src = s;
+ return ((size_t)-1);
+ }
+ if (nb > (int)len)
+ /* MB sequence for character won't fit. */
+ break;
+ memcpy(dst, buf, nb);
+ }
+ if (*s == L'\0') {
+ *src = NULL;
+ return (nbytes + nb - 1);
+ }
+ s++;
+ dst += nb;
+ len -= nb;
+ nbytes += nb;
+ }
+ *src = s;
+ return (nbytes);
+}
projects / apple / libc.git / blobdiff