[apple/libc.git] / locale / utf2.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.
 *
 * $FreeBSD: src/lib/libc/locale/utf2.c,v 1.3.2.2 2001/03/05 10:27:18 obrien Exp $
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)utf2.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */

#include <rune.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>

rune_t	_UTF2_sgetrune __P((const char *, size_t, char const **));
int	_UTF2_sputrune __P((rune_t, char *, size_t, char **));

static int _utf_count[16] = {
	1, 1, 1, 1, 1, 1, 1, 1,
	0, 0, 0, 0, 2, 2, 3, 0,
};

int
_UTF2_init(rl)
	_RuneLocale *rl;
{
	rl->sgetrune = _UTF2_sgetrune;
	rl->sputrune = _UTF2_sputrune;
	_CurrentRuneLocale = rl;
	__mb_cur_max = 3;
	return (0);
}

rune_t
_UTF2_sgetrune(string, n, result)
	const char *string;
	size_t n;
	char const **result;
{
	int c;

	if (n < 1 || (c = _utf_count[(*string >> 4) & 0xf]) > n) {
		if (result)
			*result = string;
		return (_INVALID_RUNE);
	}
	switch (c) {
	case 1:
		if (result)
			*result = string + 1;
		return (*string & 0xff);
	case 2:
		if ((string[1] & 0xC0) != 0x80)
			goto encoding_error;
		if (result)
			*result = string + 2;
		return (((string[0] & 0x1F) << 6) | (string[1] & 0x3F));
	case 3:
		if ((string[1] & 0xC0) != 0x80 || (string[2] & 0xC0) != 0x80)
			goto encoding_error;
		if (result)
			*result = string + 3;
		return (((string[0] & 0x1F) << 12) | ((string[1] & 0x3F) << 6)
		    | (string[2] & 0x3F));
	default:
encoding_error:	if (result)
			*result = string + 1;
		return (_INVALID_RUNE);
	}
}

int
_UTF2_sputrune(c, string, n, result)
	rune_t c;
	char *string, **result;
	size_t n;
{
	if (c & 0xF800) {
		if (n >= 3) {
			if (string) {
				string[0] = 0xE0 | ((c >> 12) & 0x0F);
				string[1] = 0x80 | ((c >> 6) & 0x3F);
				string[2] = 0x80 | ((c) & 0x3F);
			}
			if (result)
				*result = string + 3;
		} else
			if (result)
				*result = NULL;

		return (3);
	} else
		if (c & 0x0780) {
			if (n >= 2) {
				if (string) {
					string[0] = 0xC0 | ((c >> 6) & 0x1F);
					string[1] = 0x80 | ((c) & 0x3F);
				}
				if (result)
					*result = string + 2;
			} else
				if (result)
					*result = NULL;
			return (2);
		} else {
			if (n >= 1) {
				if (string)
					string[0] = c;
				if (result)
					*result = string + 1;
			} else
				if (result)
					*result = NULL;
			return (1);
		}
}
Commit	Line	Data
5b2abdfb	1	/*-
e9ce8d39 A	2	* Copyright (c) 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* Paul Borman at Krystal Technologies.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. Neither the name of the University nor the names of its contributors
	21	* may be used to endorse or promote products derived from this software
	22	* without specific prior written permission.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	* SUCH DAMAGE.
5b2abdfb A	35	*
5b2abdfb A	36	* $FreeBSD: src/lib/libc/locale/utf2.c,v 1.3.2.2 2001/03/05 10:27:18 obrien Exp $
e9ce8d39 A	37	*/
e9ce8d39 A	38
5b2abdfb A	39	#if defined(LIBC_SCCS) && !defined(lint)
	40	static char sccsid[] = "@(#)utf2.c 8.1 (Berkeley) 6/4/93";
	41	#endif /* LIBC_SCCS and not lint */
e9ce8d39	42
e9ce8d39 A	43	#include <rune.h>
	44	#include <stddef.h>
	45	#include <stdio.h>
	46	#include <stdlib.h>
	47
	48	rune_t _UTF2_sgetrune __P((const char , size_t, char const *));
	49	int _UTF2_sputrune __P((rune_t, char , size_t, char *));
	50
5b2abdfb	51	static int _utf_count[16] = {
e9ce8d39 A	52	1, 1, 1, 1, 1, 1, 1, 1,
	53	0, 0, 0, 0, 2, 2, 3, 0,
	54	};
	55
	56	int
	57	_UTF2_init(rl)
	58	_RuneLocale *rl;
	59	{
	60	rl->sgetrune = _UTF2_sgetrune;
	61	rl->sputrune = _UTF2_sputrune;
	62	_CurrentRuneLocale = rl;
	63	__mb_cur_max = 3;
	64	return (0);
	65	}
	66
	67	rune_t
	68	_UTF2_sgetrune(string, n, result)
	69	const char *string;
	70	size_t n;
	71	char const **result;
	72	{
	73	int c;
	74
	75	if (n < 1 \|\| (c = _utf_count[(*string >> 4) & 0xf]) > n) {
	76	if (result)
	77	*result = string;
	78	return (_INVALID_RUNE);
	79	}
	80	switch (c) {
	81	case 1:
	82	if (result)
	83	*result = string + 1;
	84	return (*string & 0xff);
	85	case 2:
	86	if ((string[1] & 0xC0) != 0x80)
	87	goto encoding_error;
	88	if (result)
	89	*result = string + 2;
	90	return (((string[0] & 0x1F) << 6) \| (string[1] & 0x3F));
	91	case 3:
	92	if ((string[1] & 0xC0) != 0x80 \|\| (string[2] & 0xC0) != 0x80)
	93	goto encoding_error;
	94	if (result)
	95	*result = string + 3;
	96	return (((string[0] & 0x1F) << 12) \| ((string[1] & 0x3F) << 6)
	97	\| (string[2] & 0x3F));
	98	default:
	99	encoding_error: if (result)
	100	*result = string + 1;
	101	return (_INVALID_RUNE);
	102	}
	103	}
	104
	105	int
	106	_UTF2_sputrune(c, string, n, result)
	107	rune_t c;
	108	char string, *result;
	109	size_t n;
	110	{
	111	if (c & 0xF800) {
	112	if (n >= 3) {
	113	if (string) {
	114	string[0] = 0xE0 \| ((c >> 12) & 0x0F);
	115	string[1] = 0x80 \| ((c >> 6) & 0x3F);
116	string[2] = 0x80 \| ((c) & 0x3F);
117	}
118	if (result)
119	*result = string + 3;
120	} else
121	if (result)
122	*result = NULL;
123
124	return (3);
125	} else
126	if (c & 0x0780) {
127	if (n >= 2) {
128	if (string) {
129	string[0] = 0xC0 \| ((c >> 6) & 0x1F);
130	string[1] = 0x80 \| ((c) & 0x3F);
131	}
132	if (result)
133	*result = string + 2;
134	} else
135	if (result)
136	*result = NULL;
137	return (2);
138	} else {
139	if (n >= 1) {
140	if (string)
141	string[0] = c;
142	if (result)
143	*result = string + 1;
144	} else
145	if (result)
146	*result = NULL;
147	return (1);
148	}
149	}